/* ══════════ EM-CPs Design System v3 — Professional Medical Grade ══════════ */
/* Self-hosted variable UI face. One file covers the whole weight range the
   design system asks for (--font-weight-body 500 … --font-weight-title 800), so
   headings render in a true 800 instead of a synthesised bold. `swap` keeps
   first paint on the system stack, which matters on a slow hospital link. */
@font-face {
    font-family: "Plus Jakarta Sans";
    src: url("fonts/PlusJakartaSans-Variable.ttf?v=20260928-nightmode-r1") format("truetype");
    font-weight: 200 800;
    font-style: normal;
    font-display: swap;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }

html {
    scroll-padding-top: calc(20px + env(safe-area-inset-top, 20px));
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    scroll-behavior: smooth;
    /* Variable font: let the face pick its optical size per point size. */
    font-optical-sizing: auto;
    font-size: calc(16px * var(--type-scale, 1));
}

:root {
    --type-scale: 1;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 22px;
    --radius-full: 9999px;
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-lg: 16px;
    --space-xl: 24px;
    --space-2xl: 32px;
    --space-3xl: 40px;
    --touch-target: 44px;
    --transition-fast: 150ms;
    --transition-base: 220ms;
    --transition-smooth: 280ms;
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Light Theme — neutral clinical surfaces (accent-agnostic) */
    --bg: #f7faf9;
    --ink: #0f241e;
    --ink-soft: #4a635a;
    --line: #dbe6e1;
    --line-subtle: #ebf2ef;
    --card: #ffffff;
    --card-elevated: #ffffff;
    /* Default accent: emerald (light) */
    --brand: #0b3d2e;
    --brand-2: #105944;
    --accent: #0f9d76;
    --accent-2: #2dd4a8;
    --accent-light: #e6f7f2;
    --accent-rgb: 15, 157, 118;
    --shadow-rgb: 16, 89, 68;
    --on-fill: #ffffff;
    --on-mark: #05241a;
    --mark-1: #2dd4a8;
    --mark-2: #0f9d76;
    --gold: #d97706;
    --gold-bg: #fffbeb;
    --critical: #dc2626;
    --critical-bg: #fef2f2;
    --critical-line: #fecaca;
    --emergent: #ea580c;
    --emergent-bg: #fff7ed;
    --emergent-line: #fed7aa;
    --common: #16a34a;
    --common-bg: #f0fdf4;
    --common-line: #bbf7d0;
    --topbar-bg: rgba(247, 250, 249, 0.82);
    --foot-bg: #edf3f0;
    --hover-line: #a0d9c5;
    --home-hover: #f0f8f4;
    --ov-job-bg: linear-gradient(135deg, #f0fbf6 0%, #e8f6f0 100%);
    --ov-job-line: #bfe8d8;
    --rf-box-bg: #fff8f8;
    --rf-box-line: #fca5a5;
    --rf-mid-bg: #fff7ed;
    --rf-mid-ink: #c2410c;
    --pearls-bg: #f0fdf7;
    --pearls-line: #bbf7d0;
    --pitfalls-bg: #fffbeb;
    --pitfalls-line: #fde68a;
    --pitfalls-ink: #92400e;
    --shadow-sm: 0 1px 3px rgba(15, 36, 30, 0.05), 0 1px 2px rgba(15, 36, 30, 0.03);
    --shadow: 0 4px 12px rgba(15, 36, 30, 0.06), 0 1px 3px rgba(15, 36, 30, 0.03);
    --shadow-lg: 0 10px 28px rgba(15, 36, 30, 0.08), 0 4px 10px rgba(15, 36, 30, 0.05);
    --shadow-float: 0 18px 42px rgba(15, 36, 30, 0.14);
    --side-w: 268px;
    --grad-brand: linear-gradient(135deg, #0b3d2e 0%, #115c46 55%, #0f9d76 100%);
    --font: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    /* Liquid Glass tokens (iOS 27) */
    --glass-blur-sm: 12px;
    --glass-blur-md: 20px;
    --glass-blur-lg: 28px;
    --glass-saturate: 180%;
    --glass-bg-primary: rgba(255, 255, 255, 0.78);
    --glass-bg-card: rgba(255, 255, 255, 0.65);
    --glass-bg-pill: rgba(0, 0, 0, 0.04);
    --glass-border-subtle: rgba(0, 0, 0, 0.07);
    --glass-border-highlight: rgba(255, 255, 255, 0.85);
    --surface-1: rgba(0, 0, 0, 0.03);
    --surface-2: rgba(0, 0, 0, 0.05);
    /* Sidebar — always dark, tinted per accent (emerald default) */
    --side-bg-1: #093326;
    --side-bg-2: #0c4232;
    --side-bg-3: #082a20;
    --side-ink: #eafaf3;
    --side-muted: #d1eee3;
    --side-sub: #9ccfbd;
    --side-label: #8acbb6;
    --side-note: #84beab;
    --side-scroll: #1a5e4a;
}

html[data-theme="dark"] {
    color-scheme: dark;
    --glass-bg-primary: rgba(15, 23, 42, 0.75);
    --glass-bg-card: rgba(30, 41, 59, 0.45);
    --glass-bg-pill: rgba(255, 255, 255, 0.06);
    --glass-border-subtle: rgba(255, 255, 255, 0.08);
    --glass-border-highlight: rgba(255, 255, 255, 0.18);
    --surface-1: rgba(255, 255, 255, 0.04);
    --surface-2: rgba(255, 255, 255, 0.08);
    --bg: #0b110f;
    --ink: #edf7f3;
    --ink-soft: #9bb5ab;
    --line: #1c2f28;
    --line-subtle: #14231d;
    --card: #111e18;
    --card-elevated: #162720;
    --brand: #6ee7b7;
    --brand-2: #34d399;
    --accent: #2dd4a8;
    --accent-2: #10b981;
    --accent-light: rgba(var(--accent-rgb), 0.14);
    --accent-rgb: 45, 212, 168;
    --shadow-rgb: 45, 212, 168;
    --on-fill: #05241a;
    --gold: #fbbf24;
    --gold-bg: rgba(251, 191, 36, 0.14);
    --critical: #f87171;
    --critical-bg: #2d1414;
    --critical-line: #5c2222;
    --emergent: #fb923c;
    --emergent-bg: #2d1d12;
    --emergent-line: #5c381a;
    --common: #4ade80;
    --common-bg: #122818;
    --common-line: #225230;
    --topbar-bg: rgba(11, 17, 15, 0.82);
    --foot-bg: #0d1714;
    --hover-line: #2e5f50;
    --home-hover: #162a22;
    --ov-job-bg: linear-gradient(135deg, #132b22 0%, #0f221b 100%);
    --ov-job-line: #244d3f;
    --rf-box-bg: #241313;
    --rf-box-line: #6b2828;
    --rf-mid-bg: #291c10;
    --rf-mid-ink: #fdba74;
    --pearls-bg: #122920;
    --pearls-line: #234f3e;
    --pitfalls-bg: #262010;
    --pitfalls-line: #54441e;
    --pitfalls-ink: #fde68a;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.45);
    --shadow: 0 4px 16px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.65), inset 0 1px 0 rgba(255, 255, 255, 0.06);
    --shadow-float: 0 20px 48px rgba(0, 0, 0, 0.75);
    --grad-brand: linear-gradient(135deg, #093829 0%, #0d4a37 55%, #106e53 100%);
}

/* ══════════ Accent themes — user-selectable, light + dark ══════════
   Severity (critical/emergent/common), gold, pitfalls stay fixed for
   clinical meaning. Only brand/accent + tinted surfaces change. */

/* ——— Emerald (default green) explicit ——— */
html[data-accent="emerald"] {
    --brand: #0b3d2e; --brand-2: #105944; --accent: #0f9d76; --accent-2: #2dd4a8;
    --accent-light: #e6f7f2; --accent-rgb: 15, 157, 118; --shadow-rgb: 16, 89, 68;
    --on-fill: #ffffff; --on-mark: #05241a; --mark-1: #2dd4a8; --mark-2: #0f9d76;
    --bg: #f7faf9; --ink: #0f241e; --ink-soft: #4a635a; --line: #dbe6e1; --line-subtle: #ebf2ef;
    --topbar-bg: rgba(247, 250, 249, 0.82); --foot-bg: #edf3f0;
    --hover-line: #a0d9c5; --home-hover: #f0f8f4;
    --ov-job-bg: linear-gradient(135deg, #f0fbf6 0%, #e8f6f0 100%); --ov-job-line: #bfe8d8;
    --grad-brand: linear-gradient(135deg, #0b3d2e 0%, #115c46 55%, #0f9d76 100%);
    --side-bg-1: #093326; --side-bg-2: #0c4232; --side-bg-3: #082a20;
    --side-muted: #d1eee3; --side-sub: #9ccfbd; --side-label: #8acbb6; --side-note: #84beab; --side-scroll: #1a5e4a;
}
html[data-theme="dark"][data-accent="emerald"] {
    --brand: #6ee7b7; --brand-2: #34d399; --accent: #2dd4a8; --accent-2: #10b981;
    --accent-light: rgba(var(--accent-rgb), 0.14); --accent-rgb: 45, 212, 168; --shadow-rgb: 45, 212, 168;
    --on-fill: #05241a;
    --bg: #0b110f; --ink: #edf7f3; --ink-soft: #9bb5ab; --line: #1c2f28; --line-subtle: #14231d;
    --card: #111e18; --card-elevated: #162720;
    --topbar-bg: rgba(11, 17, 15, 0.82); --foot-bg: #0d1714;
    --hover-line: #2e5f50; --home-hover: #162a22;
    --ov-job-bg: linear-gradient(135deg, #132b22 0%, #0f221b 100%); --ov-job-line: #244d3f;
    --grad-brand: linear-gradient(135deg, #093829 0%, #0d4a37 55%, #106e53 100%);
}

/* ——— Ocean (clinical blue) ——— */
html[data-accent="ocean"] {
    --brand: #0b2e5e; --brand-2: #1d4fa1; --accent: #2563eb; --accent-2: #60a5fa;
    --accent-light: #eff6ff; --accent-rgb: 37, 99, 235; --shadow-rgb: 29, 79, 161;
    --on-fill: #ffffff; --on-mark: #081a38; --mark-1: #60a5fa; --mark-2: #2563eb;
    --bg: #f6f8fc; --ink: #0f1c33; --ink-soft: #475a77; --line: #d8e1ee; --line-subtle: #e9eff7;
    --topbar-bg: rgba(246, 248, 252, 0.82); --foot-bg: #e9edf4;
    --hover-line: #a4c3ef; --home-hover: #f0f5fe;
    --ov-job-bg: linear-gradient(135deg, #f0f5fd 0%, #e6effe 100%); --ov-job-line: #bfd4f5;
    --grad-brand: linear-gradient(135deg, #0b2e5e 0%, #1a4fa0 55%, #2563eb 100%);
    --side-bg-1: #0a2247; --side-bg-2: #12365f; --side-bg-3: #081a36;
    --side-muted: #d3e3f8; --side-sub: #a9c6ee; --side-label: #8fb4e8; --side-note: #7fa5d8; --side-scroll: #1e4a7a;
}
html[data-theme="dark"][data-accent="ocean"] {
    --brand: #93c5fd; --brand-2: #60a5fa; --accent: #60a5fa; --accent-2: #2563eb;
    --accent-light: rgba(96, 165, 250, 0.14); --accent-rgb: 96, 165, 250; --shadow-rgb: 96, 165, 250;
    --on-fill: #081a38;
    --bg: #0b1019; --ink: #e8eef8; --ink-soft: #94a5bd; --line: #1c283c; --line-subtle: #141d2d;
    --card: #111a28; --card-elevated: #162234;
    --topbar-bg: rgba(11, 16, 25, 0.82); --foot-bg: #0c1424;
    --hover-line: #2b5078; --home-hover: #152236;
    --ov-job-bg: linear-gradient(135deg, #12233a 0%, #0e1c2f 100%); --ov-job-line: #23405f;
    --grad-brand: linear-gradient(135deg, #0a2050 0%, #153a7d 55%, #1d4fb0 100%);
}

/* ——— Violet ——— */
html[data-accent="violet"] {
    --brand: #2e1a6b; --brand-2: #5b34c4; --accent: #7c3aed; --accent-2: #a78bfa;
    --accent-light: #f5f3ff; --accent-rgb: 124, 58, 237; --shadow-rgb: 91, 52, 196;
    --on-fill: #ffffff; --on-mark: #1e1048; --mark-1: #a78bfa; --mark-2: #7c3aed;
    --bg: #f8f6fc; --ink: #1b1430; --ink-soft: #5b4f75; --line: #e2dcf0; --line-subtle: #eeebf7;
    --topbar-bg: rgba(248, 246, 252, 0.82); --foot-bg: #ece8f4;
    --hover-line: #c4b0f0; --home-hover: #f3effe;
    --ov-job-bg: linear-gradient(135deg, #f4f0fd 0%, #ece5fd 100%); --ov-job-line: #d3c4f5;
    --grad-brand: linear-gradient(135deg, #2e1a6b 0%, #5b34c4 55%, #7c3aed 100%);
    --side-bg-1: #1e1247; --side-bg-2: #2f1f6b; --side-bg-3: #190f3d;
    --side-muted: #ddd2f8; --side-sub: #bdaef0; --side-label: #ab94ec; --side-note: #9a86d6; --side-scroll: #4a3690;
}
html[data-theme="dark"][data-accent="violet"] {
    --brand: #c4b5fd; --brand-2: #a78bfa; --accent: #a78bfa; --accent-2: #7c3aed;
    --accent-light: rgba(167, 139, 250, 0.14); --accent-rgb: 167, 139, 250; --shadow-rgb: 167, 139, 250;
    --on-fill: #1e1048;
    --bg: #0f0d1a; --ink: #ece7f8; --ink-soft: #a59abf; --line: #27213d; --line-subtle: #1c172e;
    --card: #161226; --card-elevated: #1c1830;
    --topbar-bg: rgba(15, 13, 26, 0.82); --foot-bg: #120f1e;
    --hover-line: #4d3c80; --home-hover: #221c38;
    --ov-job-bg: linear-gradient(135deg, #1e1836 0%, #181430 100%); --ov-job-line: #3d2f63;
    --grad-brand: linear-gradient(135deg, #21134f 0%, #3a2490 55%, #5b34c4 100%);
}

/* ——— Rose (refined berry — clearly distinct from critical red) ——— */
html[data-accent="rose"] {
    --brand: #58122d; --brand-2: #9d174d; --accent: #be185d; --accent-2: #f472b6;
    --accent-light: #fdf2f8; --accent-rgb: 190, 24, 93; --shadow-rgb: 157, 23, 77;
    --on-fill: #ffffff; --on-mark: #38081a; --mark-1: #f472b6; --mark-2: #be185d;
    --bg: #faf5f7; --ink: #30111b; --ink-soft: #714e59; --line: #ebd8df; --line-subtle: #f5e8ed;
    --topbar-bg: rgba(250, 245, 247, 0.82); --foot-bg: #f4e9ee;
    --hover-line: #ee9fb9; --home-hover: #fdf2f5;
    --ov-job-bg: linear-gradient(135deg, #fdf2f5 0%, #fce7ef 100%); --ov-job-line: #f3bdd0;
    --grad-brand: linear-gradient(135deg, #58122d 0%, #9d174d 55%, #be185d 100%);
    --side-bg-1: #3b0c1e; --side-bg-2: #58122d; --side-bg-3: #2d0716;
    --side-muted: #f6d2df; --side-sub: #efa5bf; --side-label: #e691b0; --side-note: #d47898; --side-scroll: #7a2644;
}
html[data-theme="dark"][data-accent="rose"] {
    --brand: #fbcfe8; --brand-2: #f472b6; --accent: #f472b6; --accent-2: #db2777;
    --accent-light: rgba(244, 114, 182, 0.14); --accent-rgb: 244, 114, 182; --shadow-rgb: 244, 114, 182;
    --on-fill: #38081a;
    --bg: #140d12; --ink: #fae8f0; --ink-soft: #c299a9; --line: #391f2a; --line-subtle: #29151e;
    --card: #1f1219; --card-elevated: #271720;
    --topbar-bg: rgba(20, 13, 18, 0.82); --foot-bg: #190e14;
    --hover-line: #722d46; --home-hover: #2f1522;
    --ov-job-bg: linear-gradient(135deg, #2b131f 0%, #220f18 100%); --ov-job-line: #5b2138;
    --grad-brand: linear-gradient(135deg, #480c25 0%, #76123d 55%, #9d174d 100%);
}

/* ——— Amber (warm honey/bronze — clearly distinct from emergent orange) ——— */
html[data-accent="amber"] {
    --brand: #4a2800; --brand-2: #8a4805; --accent: #b45309; --accent-2: #f59e0b;
    --accent-light: #fefbeb; --accent-rgb: 180, 83, 9; --shadow-rgb: 138, 72, 5;
    --on-fill: #ffffff; --on-mark: #381e00; --mark-1: #f59e0b; --mark-2: #b45309;
    --bg: #faf6ef; --ink: #312108; --ink-soft: #705f45; --line: #e8dbc3; --line-subtle: #f3ebd8;
    --topbar-bg: rgba(250, 246, 239, 0.82); --foot-bg: #f1ecde;
    --hover-line: #e5c183; --home-hover: #fef8ec;
    --ov-job-bg: linear-gradient(135deg, #fdf7eb 0%, #fbedd4 100%); --ov-job-line: #ecd0a0;
    --grad-brand: linear-gradient(135deg, #4a2800 0%, #8a4805 55%, #b45309 100%);
    --side-bg-1: #2e1a03; --side-bg-2: #482806; --side-bg-3: #241402;
    --side-muted: #f3dfbe; --side-sub: #e6be87; --side-label: #dcad6c; --side-note: #c5934f; --side-scroll: #694519;
}
html[data-theme="dark"][data-accent="amber"] {
    --brand: #fde68a; --brand-2: #f59e0b; --accent: #fbbf24; --accent-2: #d97706;
    --accent-light: rgba(251, 191, 36, 0.14); --accent-rgb: 251, 191, 36; --shadow-rgb: 251, 191, 36;
    --on-fill: #381e00;
    --bg: #131008; --ink: #faf0da; --ink-soft: #c1ab80; --line: #362e1a; --line-subtle: #262012;
    --card: #1c170e; --card-elevated: #241e12;
    --topbar-bg: rgba(19, 16, 8, 0.82); --foot-bg: #161206;
    --hover-line: #695328; --home-hover: #29200f;
    --ov-job-bg: linear-gradient(135deg, #251e0e 0%, #1e180b 100%); --ov-job-line: #54411a;
    --grad-brand: linear-gradient(135deg, #381e00 0%, #683704 55%, #8a4805 100%);
}

/* ——— Teal (cyan) ——— */
html[data-accent="teal"] {
    --brand: #07333b; --brand-2: #0c6a82; --accent: #0891b2; --accent-2: #22d3ee;
    --accent-light: #e6fbf8; --accent-rgb: 8, 145, 178; --shadow-rgb: 12, 106, 130;
    --on-fill: #ffffff; --on-mark: #052e33; --mark-1: #22d3ee; --mark-2: #0891b2;
    --bg: #f4f8f8; --ink: #0e2326; --ink-soft: #4a6668; --line: #d6e4e5; --line-subtle: #e6eeee;
    --topbar-bg: rgba(244, 248, 248, 0.82); --foot-bg: #e6efef;
    --hover-line: #8fd4e0; --home-hover: #eefafa;
    --ov-job-bg: linear-gradient(135deg, #effafa 0%, #e2f5f7 100%); --ov-job-line: #b3e0e8;
    --grad-brand: linear-gradient(135deg, #07333b 0%, #0e6b7a 55%, #0891b2 100%);
    --side-bg-1: #07333b; --side-bg-2: #0c4f5a; --side-bg-3: #052025;
    --side-muted: #c9eaf2; --side-sub: #93d0dc; --side-label: #7cc4d4; --side-note: #6aafbe; --side-scroll: #155e6a;
}
html[data-theme="dark"][data-accent="teal"] {
    --brand: #a5f3fc; --brand-2: #22d3ee; --accent: #22d3ee; --accent-2: #0891b2;
    --accent-light: rgba(34, 211, 238, 0.14); --accent-rgb: 34, 211, 238; --shadow-rgb: 34, 211, 238;
    --on-fill: #052e33;
    --bg: #0b1214; --ink: #e3f4f5; --ink-soft: #91afb1; --line: #1c2e32; --line-subtle: #142326;
    --card: #111e21; --card-elevated: #16262a;
    --topbar-bg: rgba(11, 18, 20, 0.82); --foot-bg: #0b1516;
    --hover-line: #2c5f5c; --home-hover: #122826;
    --ov-job-bg: linear-gradient(135deg, #102724 0%, #0c1f1e 100%); --ov-job-line: #1f4a48;
    --grad-brand: linear-gradient(135deg, #052e33 0%, #0b4a4f 55%, #0e6b7a 100%);
}

/* ─────────── Typography & Base Resets ─────────── */
body {
    font-family: var(--font);
    font-variant-numeric: tabular-nums;
    background: var(--bg);
    color: var(--ink);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    line-height: 1.55;
    min-height: 100dvh;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    transition: background-color var(--transition-smooth) ease, color var(--transition-smooth) ease;
}

html[data-weight="bold"] {
    --font-weight-body: 500;
    --font-weight-title: 800;
}
html:not([data-weight="bold"]) {
    --font-weight-body: 400;
    --font-weight-title: 700;
}

body { font-weight: var(--font-weight-body, 400); }
strong, b, h1, h2, h3, h4, h5, h6, .brand-text strong, .btn, .chip, .home-btn {
    font-weight: var(--font-weight-title, 700);
}

button {
    font-family: inherit;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

a, button, select, input, textarea, [role="button"], [tabindex] {
    touch-action: manipulation;
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 6px;
}
:focus:not(:focus-visible) {
    outline: none;
}

.skip-link {
    position: fixed;
    left: 16px;
    top: -80px;
    z-index: 600;
    padding: 10px 16px;
    border-radius: var(--radius-md);
    background: var(--accent);
    color: var(--on-fill);
    font-weight: 800;
    text-decoration: none;
    font-size: 0.88rem;
    box-shadow: var(--shadow-lg);
    transition: top var(--transition-smooth) var(--ease-out);
}
.skip-link:focus { top: 16px; }

.noscript {
    margin: 20px;
    padding: 16px 20px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    color: var(--ink);
}

::selection { background: rgba(var(--accent-rgb), 0.32); color: inherit; }
::-moz-selection { background: rgba(var(--accent-rgb), 0.32); color: inherit; }

/* ─────────── Scrollbars (accent-tinted) ─────────── */
::-webkit-scrollbar { width: 7px; height: 7px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: var(--hover-line);
    border-radius: var(--radius-full);
    border: 2px solid var(--bg);
    background-clip: padding-box;
}
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

* { scrollbar-width: thin; scrollbar-color: var(--hover-line) transparent; }
html[data-theme="dark"] { scrollbar-color: var(--ov-job-line) transparent; }
html[data-theme="dark"] ::-webkit-scrollbar-thumb {
    background: var(--ov-job-line);
    border-color: var(--bg);
}
html[data-theme="dark"] ::-webkit-scrollbar-thumb:hover { background: var(--hover-line); }

/* ─────────── Sidebar (accent-tinted, always dark) ─────────── */
.sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: var(--side-w);
    background: linear-gradient(180deg, var(--side-bg-1) 0%, var(--side-bg-2) 50%, var(--side-bg-3) 100%);
    color: var(--side-ink);
    z-index: 110;
    display: flex;
    flex-direction: column;
    padding: max(18px, env(safe-area-inset-top, 18px)) 14px calc(16px + env(safe-area-inset-bottom, 16px));
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--side-scroll) transparent;
    -webkit-overflow-scrolling: touch;
    box-shadow: 2px 0 24px rgba(0, 0, 0, 0.28);
    border-right: 1px solid rgba(255, 255, 255, 0.08);
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--side-scroll); border-radius: var(--radius-full); }

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 6px 10px 18px;
    background: none;
    border: none;
    color: inherit;
    font: inherit;
    text-align: left;
    cursor: pointer;
    width: 100%;
    min-height: var(--touch-target);
    border-radius: var(--radius-md);
    transition: background var(--transition-fast) ease;
}
.brand:hover { background: rgba(255, 255, 255, 0.06); }
.brand:active { background: rgba(255, 255, 255, 0.1); }
.brand:hover .brand-mark { transform: scale(1.05) rotate(-2deg); }

.brand-mark {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    flex: none;
    display: grid;
    place-items: center;
    overflow: hidden;
    background: linear-gradient(135deg, var(--mark-1) 0%, var(--mark-2) 100%);
    color: var(--on-mark);
    font-weight: 900;
    font-size: 1.15rem;
    letter-spacing: -0.5px;
    box-shadow: 0 6px 18px rgba(var(--accent-rgb), 0.38);
    transition: transform var(--transition-smooth) var(--ease-spring), box-shadow var(--transition-base) ease;
}
.brand-mark img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.brand-text strong {
    display: block;
    font-size: 1.05rem;
    line-height: 1.2;
    color: #ffffff;
    letter-spacing: -0.01em;
}
.brand-text span {
    font-size: 0.72rem;
    color: var(--side-sub);
    line-height: 1.3;
    font-weight: 500;
}

.side-group { margin-bottom: 12px; }
.side-label {
    font-size: 0.65rem;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--side-label);
    padding: 8px 10px 4px;
    line-height: 1.4;
}
.side-list { display: flex; flex-direction: column; gap: 3px; }
.side-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    border-radius: 10px;
    cursor: pointer;
    color: var(--side-muted);
    font-size: 0.86rem;
    font-weight: 600;
    border: 1px solid transparent;
    width: 100%;
    text-align: left;
    background: none;
    font-family: inherit;
    min-height: var(--touch-target);
    transition: background var(--transition-fast) ease, transform var(--transition-fast) ease, color var(--transition-fast) ease;
}
.side-item i.ico {
    font-style: normal;
    font-size: 1.05rem;
    width: 22px;
    text-align: center;
    flex-shrink: 0;
}
.side-item:hover {
    background: rgba(255, 255, 255, 0.09);
    color: #ffffff;
    transform: translateX(3px);
}
.side-item:active {
    background: rgba(255, 255, 255, 0.15);
    transform: translateX(1px);
}
.side-item.active {
    background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.24) 0%, rgba(var(--accent-rgb), 0.12) 100%);
    border-color: rgba(var(--accent-rgb), 0.5);
    color: #ffffff;
    font-weight: 700;
    box-shadow: inset 3px 0 0 var(--accent-2), 0 2px 8px rgba(0, 0, 0, 0.2);
}
.side-item.side-home {
    margin-bottom: 6px;
    color: #ffffff;
    border-color: rgba(var(--accent-rgb), 0.32);
    background: rgba(var(--accent-rgb), 0.14);
}

.side-footer {
    margin-top: auto;
    padding-top: 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.side-btn {
    width: 100%;
    padding: 10px 14px;
    border-radius: 10px;
    cursor: pointer;
    border: 1px solid rgba(255, 255, 255, 0.18);
    background: rgba(255, 255, 255, 0.07);
    color: var(--side-muted);
    font-family: inherit;
    font-size: 0.8rem;
    font-weight: 700;
    min-height: var(--touch-target);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: background var(--transition-fast) ease, border-color var(--transition-fast) ease, transform var(--transition-fast) ease;
}
.side-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.3);
}
.side-btn:active {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(0.98);
}
.install-btn {
    margin-bottom: 8px;
    border-color: rgba(var(--accent-rgb), 0.6);
    background: rgba(var(--accent-rgb), 0.18);
    color: #ffffff;
}
.install-btn:hover { background: rgba(var(--accent-rgb), 0.3); }

.side-note {
    font-size: 0.65rem;
    color: var(--side-note);
    margin-top: 12px;
    line-height: 1.5;
    text-align: center;
}

.side-backdrop {
    position: fixed;
    inset: 0;
    z-index: 105;
    background: rgba(6, 18, 14, 0.65);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-smooth) var(--ease-out);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
}
.side-backdrop.show { opacity: 1; pointer-events: auto; }

/* ─────────── Main Layout ─────────── */
.main {
    margin-left: var(--side-w);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ─────────── Topbar ─────────── */
.topbar {
    position: sticky;
    top: 0;
    z-index: 90;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: max(10px, env(safe-area-inset-top, 10px)) 24px 10px;
    background: var(--topbar-bg);
    -webkit-backdrop-filter: blur(18px) saturate(1.6);
    backdrop-filter: blur(18px) saturate(1.6);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.03);
    transition: background-color var(--transition-smooth) ease, border-color var(--transition-smooth) ease;
}

.burger { display: none; }
.tools-toggle {
    display: none;
    height: var(--touch-target);
    min-height: var(--touch-target);
    min-width: var(--touch-target);
    padding: 0 12px;
    border: 1.5px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--card);
    color: var(--brand-2);
    font-family: inherit;
    font-size: 0.82rem;
    font-weight: 800;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    gap: 6px;
    white-space: nowrap;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast) ease;
}
.tools-toggle:hover {
    border-color: var(--accent);
    background: var(--home-hover);
    color: var(--brand-2);
}
.tools-toggle:active {
    transform: scale(0.96);
}
.tools-toggle[aria-expanded="true"] {
    background: var(--brand-2);
    color: #ffffff;
    border-color: var(--brand-2);
    box-shadow: 0 2px 8px rgba(var(--shadow-rgb), 0.25);
}
html[data-theme="dark"] .tools-toggle[aria-expanded="true"] {
    background: var(--accent);
    color: var(--on-fill);
    border-color: var(--accent);
    box-shadow: 0 2px 10px rgba(var(--accent-rgb), 0.3);
}

.topbar-tools {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-left: auto;
    flex-wrap: wrap;
    justify-content: flex-end;
}

/* ─────────── General Buttons ─────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-family: inherit;
    font-weight: 700;
    cursor: pointer;
    border: 1.5px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--card);
    color: var(--ink);
    min-height: var(--touch-target);
    padding: 0 16px;
    transition: background var(--transition-fast) ease,
                border-color var(--transition-fast) ease,
                color var(--transition-fast) ease,
                box-shadow var(--transition-fast) ease,
                transform var(--transition-fast) ease;
    -webkit-user-select: none;
    user-select: none;
    text-decoration: none;
    line-height: 1.2;
    white-space: nowrap;
    box-shadow: var(--shadow-sm);
}
.btn:hover {
    border-color: var(--accent);
    background: var(--home-hover);
    color: var(--brand-2);
}
.btn:active { transform: scale(0.97); }
.btn:disabled, .btn[disabled] {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none;
    pointer-events: none;
}

/* Home & Utility Topbar Buttons */
.home-btn {
    flex: none;
    height: var(--touch-target);
    padding: 0 14px;
    border-radius: var(--radius-md);
    border: 1.5px solid var(--line);
    background: var(--card);
    font-family: inherit;
    font-size: 0.82rem;
    font-weight: 800;
    color: var(--brand-2);
    cursor: pointer;
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast) ease;
}
.home-btn:hover {
    border-color: var(--accent);
    background: var(--home-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}
.home-btn:active { transform: scale(0.96); }
.home-btn.on-home {
    background: var(--brand-2);
    color: #ffffff;
    border-color: var(--brand-2);
    box-shadow: 0 2px 8px rgba(var(--shadow-rgb), 0.25);
}
html[data-theme="dark"] .home-btn.on-home {
    background: var(--accent);
    color: var(--on-fill);
    border-color: var(--accent);
    box-shadow: 0 2px 10px rgba(var(--accent-rgb), 0.3);
}

.home-btn .header-icon {
    display: inline-block;
    font-size: 1.05rem;
    line-height: 1;
}
.home-btn .header-label { font-size: 0.82rem; }

.utility-btn { color: var(--ink); }

.icon-btn {
    border: 1.5px solid var(--line);
    background: var(--card);
    border-radius: var(--radius-md);
    width: var(--touch-target);
    height: var(--touch-target);
    font-size: 1.15rem;
    cursor: pointer;
    color: var(--ink);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast) ease;
}
.icon-btn:hover {
    border-color: var(--accent);
    background: var(--home-hover);
    color: var(--brand-2);
}
.icon-btn:active { transform: scale(0.94); }

/* Severity Filter Chips */
.chips { display: flex; gap: 6px; flex-wrap: wrap; }
.chip {
    border: 1.5px solid var(--line);
    background: var(--card);
    border-radius: var(--radius-full);
    padding: 6px 13px;
    font-family: inherit;
    font-size: 0.76rem;
    font-weight: 700;
    cursor: pointer;
    color: var(--ink-soft);
    min-height: var(--touch-target);
    display: inline-flex;
    align-items: center;
    gap: 5px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast) ease;
}
.chip:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow);
    border-color: var(--hover-line);
    color: var(--ink);
}
.chip:active { transform: scale(0.97); }
.chip.active {
    color: #ffffff;
    font-weight: 800;
    border-color: transparent;
}
.chip-all.active {
    background: var(--brand-2);
    box-shadow: 0 2px 8px rgba(var(--shadow-rgb), 0.25);
}
html[data-theme="dark"] .chip-all.active {
    background: var(--accent);
    color: var(--on-fill);
    box-shadow: 0 2px 8px rgba(var(--accent-rgb), 0.3);
}
.chip-critical.active {
    background: #b91c1c;
    color: #ffffff;
    box-shadow: 0 2px 8px rgba(220, 38, 38, 0.3);
}
.chip-emergent.active {
    background: #c2410c;
    color: #ffffff;
    box-shadow: 0 2px 8px rgba(234, 88, 12, 0.3);
}
.chip-common.active {
    background: #15803d;
    color: #ffffff;
    box-shadow: 0 2px 8px rgba(22, 163, 74, 0.3);
}
html[data-theme="dark"] .chip-critical.active,
html[data-theme="dark"] .chip-emergent.active,
html[data-theme="dark"] .chip-common.active {
    /* Severity keeps fixed clinical meaning — neutral dark text on bright bg */
    color: #101613;
}
html[data-theme="dark"] .chip-critical.active { background: var(--critical); }
html[data-theme="dark"] .chip-emergent.active { background: var(--emergent); }
html[data-theme="dark"] .chip-common.active { background: var(--common); }

/* Reading Preference Tools */
.pref-tools {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: none;
}
.pref-btn {
    height: var(--touch-target);
    min-width: var(--touch-target);
    padding: 0 10px;
    border-radius: var(--radius-md);
    border: 1.5px solid var(--line);
    background: var(--card);
    font-family: inherit;
    font-size: 0.84rem;
    font-weight: 800;
    color: var(--ink);
    cursor: pointer;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast) ease;
}
.pref-btn:hover {
    border-color: var(--accent);
    background: var(--home-hover);
    color: var(--brand-2);
}
.pref-btn:active { transform: scale(0.94); }
.pref-btn[aria-pressed="true"] {
    background: var(--brand-2);
    color: #ffffff;
    border-color: var(--brand-2);
}
html[data-theme="dark"] .pref-btn[aria-pressed="true"] {
    background: var(--accent);
    color: var(--on-fill);
    border-color: var(--accent);
}
.pref-scale {
    font-size: 0.72rem;
    font-weight: 800;
    color: var(--ink-soft);
    min-width: 2.8em;
    text-align: center;
}

/* ─────────── Accent color picker (user-selectable app theme) ─────────── */
.accent-tools {
    display: flex;
    align-items: center;
    gap: 6px;
    flex: none;
    padding: 4px 6px 4px 10px;
    border: 1.5px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--card);
    box-shadow: var(--shadow-sm);
}
.accent-label {
    font-size: 0.68rem;
    font-weight: 900;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--ink-soft);
    white-space: nowrap;
}
.accent-dots { display: flex; align-items: center; gap: 4px; }
.accent-dot {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 2px solid transparent;
    background: var(--dot, var(--accent));
    cursor: pointer;
    flex: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.65), var(--shadow-sm);
    transition: transform var(--transition-fast) ease, border-color var(--transition-fast) ease, box-shadow var(--transition-fast) ease;
    touch-action: manipulation;
}
.accent-dot:hover { transform: scale(1.12); border-color: var(--accent); }
.accent-dot:active { transform: scale(0.94); }
.accent-dot:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}
.accent-dot[aria-pressed="true"] {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--card), 0 0 0 4px var(--accent), var(--shadow-sm);
    transform: scale(1.08);
}
html[data-theme="dark"] .accent-dot {
    box-shadow: inset 0 0 0 2px rgba(0, 0, 0, 0.35), var(--shadow-sm);
}
html[data-theme="dark"] .accent-dot[aria-pressed="true"] {
    box-shadow: 0 0 0 2px var(--card), 0 0 0 4px var(--accent), var(--shadow-sm);
}
.accent-dot[data-accent="emerald"] { --dot: #0f9d76; }
.accent-dot[data-accent="ocean"] { --dot: #2563eb; }
.accent-dot[data-accent="violet"] { --dot: #7c3aed; }
.accent-dot[data-accent="rose"] { --dot: #be185d; }
.accent-dot[data-accent="amber"] { --dot: #b45309; }
.accent-dot[data-accent="teal"] { --dot: #0891b2; }

/* ─────────── Search Experience ─────────── */
.searchwrap {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
    gap: 9px;
    background: var(--card);
    border: 1.5px solid var(--line);
    border-radius: var(--radius-md);
    padding: 6px 12px;
    max-width: 440px;
    min-height: var(--touch-target);
    box-shadow: var(--shadow-sm);
    transition: border-color var(--transition-fast) ease, box-shadow var(--transition-fast) ease;
}
.searchwrap:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.18), var(--shadow);
}
.search-ico {
    opacity: 0.6;
    font-size: 0.95rem;
    flex-shrink: 0;
}
#searchInput {
    border: none;
    outline: none;
    background: none;
    width: 100%;
    font-family: inherit;
    font-size: 0.88rem;
    color: var(--ink);
    min-width: 0;
    line-height: 1.4;
}
#searchInput::placeholder { color: var(--ink-soft); opacity: 0.8; }
#searchInput::-webkit-search-cancel-button { display: none; }

.search-clear-btn {
    border: 0;
    background: var(--bg);
    color: var(--ink-soft);
    border-radius: var(--radius-full);
    width: 32px;
    height: 32px;
    font-size: 0.7rem;
    font-weight: 800;
    cursor: pointer;
    display: grid;
    place-items: center;
    flex-shrink: 0;
    transition: all var(--transition-fast) ease;
}
.search-clear-btn:hover { background: var(--line); color: var(--ink); }
.search-clear-btn:active { transform: scale(0.9); }

.search-kbd {
    border: 1px solid var(--line);
    background: var(--bg);
    color: var(--ink-soft);
    border-radius: 4px;
    padding: 1px 6px;
    font-size: 0.68rem;
    font-weight: 700;
    font-family: inherit;
    flex-shrink: 0;
}

.results-pop {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-float);
    max-height: 400px;
    overflow-y: auto;
    z-index: 150;
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    animation: popIn 0.18s var(--ease-out) both;
}
@keyframes popIn {
    from { opacity: 0; transform: translateY(-6px) scale(0.98); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.res-item {
    display: flex;
    width: 100%;
    padding: 10px 14px;
    cursor: pointer;
    border: 0;
    border-bottom: 1px solid var(--line-subtle);
    background: none;
    text-align: left;
    font: inherit;
    color: inherit;
    min-height: var(--touch-target);
    align-items: center;
    gap: 12px;
    transition: background var(--transition-fast) ease;
}
.res-item:last-child { border-bottom: none; }
.res-item:hover, .res-item.active {
    background: var(--home-hover);
}
.res-ico {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    flex: none;
    border-radius: 9px;
    background: var(--ov-job-bg);
    color: var(--brand-2);
}
.res-ico .mono-ico {
    width: 18px;
    height: 18px;
    stroke: currentColor;
}
.res-ico .emoji-ico {
    font-size: 1.15rem;
}
.res-body {
    flex: 1;
    min-width: 0;
}
.res-item .r-title {
    font-size: 0.88rem;
    font-weight: 800;
    color: var(--brand-2);
}
.res-item .r-sub {
    font-size: 0.74rem;
    color: var(--ink-soft);
    margin-top: 2px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.res-item .r-tag {
    font-size: 0.64rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 3px 8px;
    border-radius: var(--radius-full);
    background: var(--bg);
    border: 1px solid var(--line);
    color: var(--ink-soft);
    flex-shrink: 0;
}

/* ─────────── Stage & Foot ─────────── */
.stage {
    flex: 1;
    padding: var(--space-2xl) clamp(16px, 4vw, 48px) var(--space-3xl);
    outline: none;
    scroll-padding-top: calc(20px + env(safe-area-inset-top, 20px));
}
.foot {
    padding: var(--space-xl) clamp(16px, 4vw, 48px) var(--space-2xl);
    color: var(--ink-soft);
    font-size: 0.76rem;
    border-top: 1px solid var(--line);
    background: var(--foot-bg);
}
.foot p {
    max-width: 960px;
    line-height: 1.6;
}

/* ─────────── Toast Notification ─────────── */
.toast {
    position: fixed;
    bottom: calc(24px + env(safe-area-inset-bottom, 0px));
    left: 50%;
    transform: translateX(-50%) translateY(80px);
    background: var(--card);
    color: var(--ink);
    border: 1.5px solid var(--accent);
    font-size: 0.84rem;
    font-weight: 700;
    padding: 11px 22px;
    border-radius: var(--radius-full);
    z-index: 400;
    opacity: 0;
    transition: transform var(--transition-smooth) var(--ease-spring), opacity var(--transition-smooth) ease;
    box-shadow: var(--shadow-float);
    pointer-events: none;
    max-width: 90vw;
    text-align: center;
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
}
.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* ─────────── Home Hero (accent gradient, neutral white text fits all accents) ─────────── */
.hero {
    background: var(--grad-brand);
    border-radius: var(--radius-xl);
    color: #ffffff;
    padding: var(--space-2xl) clamp(20px, 4.5vw, 48px);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
    margin-bottom: var(--space-xl);
    border: 1px solid rgba(255, 255, 255, 0.1);
}
.hero::after {
    content: '';
    position: absolute;
    right: -40px;
    top: -40px;
    width: 280px;
    height: 280px;
    background: radial-gradient(circle, rgba(var(--accent-rgb), 0.35) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}
.hero h1 {
    font-size: clamp(1.5rem, 3.2vw, 2.2rem);
    letter-spacing: -0.02em;
    line-height: 1.2;
    color: #ffffff;
}
.hero p {
    max-width: 780px;
    margin-top: 10px;
    color: rgba(255, 255, 255, 0.86);
    font-size: 0.94rem;
    line-height: 1.55;
}
.hero-badges {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 18px;
}
.hbadge {
    font-size: 0.74rem;
    font-weight: 700;
    padding: 6px 13px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.22);
    color: #ffffff;
    display: inline-flex;
    align-items: center;
}

/* ─────────── Study Dashboard (Home) ─────────── */
.study-dashboard {
    margin: 0 0 var(--space-xl);
    padding: 20px 24px;
    border: 1.5px solid var(--ov-job-line);
    border-radius: var(--radius-lg);
    background: var(--ov-job-bg);
    display: flex;
    gap: 18px;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
}
.study-kicker, .resus-kicker, .case-practice-head > span, .shift-kicker, .study-page-head > span {
    display: block;
    color: var(--accent);
    font-size: 0.67rem;
    font-weight: 900;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}
.study-dashboard h2 {
    font-size: 1.1rem;
    margin-top: 2px;
    color: var(--ink);
}
.study-dashboard p {
    margin-top: 3px;
    color: var(--ink-soft);
    font-size: 0.82rem;
    max-width: 580px;
}
.study-stats {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: flex-end;
}
.study-stat {
    min-width: 86px;
    padding: 9px 12px;
    border: 1.5px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--card);
    color: var(--ink);
    font: inherit;
    cursor: pointer;
    text-align: center;
    min-height: var(--touch-target);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast) ease;
}
.study-stat:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}
.study-stat:active { transform: scale(0.97); }
.study-stat strong {
    color: var(--brand-2);
    font-size: 1.1rem;
    line-height: 1.2;
}
.study-stat span {
    color: var(--ink-soft);
    font-size: 0.65rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 2px;
}
.study-stat.accent {
    background: var(--brand-2);
    border-color: var(--brand-2);
    box-shadow: 0 4px 12px rgba(var(--shadow-rgb), 0.25);
}
.study-stat.accent strong, .study-stat.accent span { color: #ffffff; }
html[data-theme="dark"] .study-stat.accent {
    background: var(--accent);
    border-color: var(--accent);
    box-shadow: 0 4px 14px rgba(var(--accent-rgb), 0.3);
}
html[data-theme="dark"] .study-stat.accent strong,
html[data-theme="dark"] .study-stat.accent span { color: var(--on-fill); }

/* ─────────── Patient Context Chips ─────────── */
.patient-filter {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 22px;
    overflow-x: auto;
    padding: 4px 0 8px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}
.patient-filter::-webkit-scrollbar { display: none; }
.patient-filter > span {
    color: var(--ink-soft);
    font-size: 0.7rem;
    font-weight: 900;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    white-space: nowrap;
    padding-right: 4px;
}
.patient-chip {
    flex: none;
    padding: 7px 14px;
    border: 1.5px solid var(--line);
    border-radius: var(--radius-full);
    background: var(--card);
    color: var(--ink-soft);
    font: inherit;
    font-size: 0.76rem;
    font-weight: 700;
    cursor: pointer;
    min-height: var(--touch-target);
    display: inline-flex;
    align-items: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast) ease;
}
.patient-chip:hover {
    border-color: var(--hover-line);
    color: var(--ink);
    transform: translateY(-1px);
}
.patient-chip:active { transform: scale(0.97); }
.patient-chip.active {
    background: var(--brand-2);
    border-color: var(--brand-2);
    color: #ffffff;
    font-weight: 800;
    box-shadow: 0 2px 8px rgba(var(--shadow-rgb), 0.25);
}
html[data-theme="dark"] .patient-chip.active {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--on-fill);
}

/* ─────────── Home Groups & Cards ─────────── */
.home-group { margin-bottom: var(--space-2xl); }
.group-title {
    font-size: 0.8rem;
    font-weight: 900;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--ink-soft);
    margin: 6px 2px 14px;
    display: flex;
    align-items: center;
    gap: 8px;
    line-height: 1.4;
}
.group-title span {
    font-size: 0.7rem;
    letter-spacing: 0;
    font-weight: 800;
    color: var(--brand-2);
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius-full);
    padding: 2px 9px;
}
.empty-filter {
    color: var(--ink-soft);
    padding: 20px 4px;
    font-size: 0.9rem;
}
.cp-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 16px;
}

.cp-card {
    background: var(--card);
    border: 1.5px solid var(--line);
    border-radius: var(--radius-xl);
    padding: 22px;
    cursor: pointer;
    text-align: left;
    font-family: inherit;
    width: 100%;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
    transition: transform var(--transition-smooth) var(--ease-out),
                box-shadow var(--transition-smooth) ease,
                border-color var(--transition-smooth) ease;
    min-height: var(--touch-target);
    display: flex;
    flex-direction: column;
    will-change: transform;
    contain: layout style;
}
.cp-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--grad-brand);
    opacity: 0;
    transition: opacity var(--transition-smooth) ease;
}
.cp-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--hover-line);
}
.cp-card:hover::before { opacity: 1; }
.cp-card:active { transform: translateY(-1px) scale(0.99); }
.cp-card:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.cp-card .cp-ico {
    font-size: 2rem;
    line-height: 1;
    margin-bottom: 6px;
}
.cp-card h3 {
    font-size: 1.05rem;
    letter-spacing: -0.01em;
    line-height: 1.3;
    color: var(--ink);
}
.cp-card p {
    font-size: 0.8rem;
    color: var(--ink-soft);
    margin-top: 4px;
    line-height: 1.45;
    flex: 1;
}
.cp-card .cp-count {
    position: absolute;
    top: 16px;
    right: 16px;
    font-size: 0.68rem;
    font-weight: 800;
    background: var(--bg);
    border: 1px solid var(--line);
    color: var(--ink-soft);
    border-radius: var(--radius-full);
    padding: 3px 9px;
}
.cp-reviewed {
    display: inline-block;
    margin-top: 10px;
    color: var(--brand-2);
    font-size: 0.7rem;
    font-weight: 800;
}
.cp-saved {
    display: inline-block;
    margin: 8px 0 0;
    color: var(--gold);
    font-size: 0.7rem;
    font-weight: 800;
}

/* ─────────── Presentation Hero ─────────── */
.cp-hero {
    border-radius: var(--radius-xl);
    padding: 28px clamp(20px, 3.5vw, 40px);
    margin-bottom: var(--space-lg);
    background: var(--grad-brand);
    color: #ffffff;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.1);
}
.cp-hero .cp-ico-lg { font-size: 2.6rem; line-height: 1; margin-bottom: 8px; }
.cp-hero h1 {
    font-size: clamp(1.45rem, 2.8vw, 2rem);
    letter-spacing: -0.02em;
    line-height: 1.2;
    color: #ffffff;
}
.cp-hero .tag {
    color: rgba(255, 255, 255, 0.86);
    font-size: 0.92rem;
    margin-top: 4px;
    line-height: 1.45;
}
.back-btn {
    min-height: var(--touch-target);
    padding: 8px 16px;
    border: 1.5px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--card);
    color: var(--brand-2);
    font: inherit;
    font-size: 0.8rem;
    font-weight: 800;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    white-space: nowrap;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast) ease;
}
.back-btn:hover {
    border-color: var(--accent);
    background: var(--home-hover);
    transform: translateY(-1px);
}
.back-btn:active { transform: scale(0.96); }

.cp-hero .back-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.16);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.32);
    border-radius: var(--radius-full);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
}
.cp-hero .back-btn:hover {
    background: rgba(255, 255, 255, 0.28);
}

/* ─────────── Fast Case Orientation Rail ─────────── */
.case-rail {
    display: grid;
    grid-template-columns: minmax(190px, 0.55fr) minmax(0, 1.9fr);
    gap: 14px;
    align-items: center;
    margin: 0 0 var(--space-lg);
    padding: 16px 20px;
    border: 1.5px solid var(--ov-job-line);
    border-radius: var(--radius-lg);
    background: var(--ov-job-bg);
    box-shadow: var(--shadow-sm);
}
.case-rail-title {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--brand-2);
}
.case-rail-title > span {
    width: 36px;
    height: 36px;
    display: grid;
    place-items: center;
    border-radius: var(--radius-md);
    background: rgba(var(--accent-rgb), 0.16);
    font-size: 1.1rem;
    flex-shrink: 0;
}
.case-rail-title strong {
    display: block;
    font-size: 0.92rem;
    line-height: 1.3;
    color: var(--ink);
}
.case-rail-title small {
    display: block;
    margin-top: 1px;
    color: var(--ink-soft);
    font-size: 0.72rem;
}
.case-steps {
    display: flex;
    gap: 8px;
    list-style: none;
}
.case-steps li {
    flex: 1;
    min-width: 0;
    font-size: 0.76rem;
    line-height: 1.4;
    color: var(--ink);
    padding: 6px 8px;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.4);
    border: 1px solid rgba(0, 0, 0, 0.04);
}
html[data-theme="dark"] .case-steps li {
    background: rgba(0, 0, 0, 0.2);
    border-color: rgba(255, 255, 255, 0.06);
}
.case-steps li > span {
    display: inline-grid;
    place-items: center;
    width: 18px;
    height: 18px;
    margin-right: 5px;
    border-radius: var(--radius-full);
    background: var(--brand-2);
    color: #ffffff;
    font-size: 0.64rem;
    font-weight: 900;
    vertical-align: top;
}
html[data-theme="dark"] .case-steps li > span {
    background: var(--accent);
    color: var(--on-fill);
}
.case-actions {
    grid-column: 2;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: flex-start;
}
.case-action {
    border: 1.5px solid var(--ov-job-line);
    background: var(--card);
    color: var(--brand-2);
    border-radius: var(--radius-full);
    padding: 6px 12px;
    font: inherit;
    font-size: 0.74rem;
    font-weight: 800;
    cursor: pointer;
    min-height: 38px;
    display: inline-flex;
    align-items: center;
    white-space: nowrap;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast) ease;
}
.case-action:hover {
    border-color: var(--accent);
    background: var(--home-hover);
    transform: translateY(-1px);
}
.case-action:active { transform: scale(0.96); }
.case-action.primary {
    background: var(--brand-2);
    border-color: var(--brand-2);
    color: #ffffff;
}
html[data-theme="dark"] .case-action.primary {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--on-fill);
}

/* ─────────── Quick Cards (Resus, Pivots, Plan, Loop) ─────────── */
.resus-card, .management-pivots, .personal-plan, .learning-loop {
    margin: 0 0 var(--space-lg);
    padding: 20px 24px;
    border-radius: var(--radius-lg);
    background: var(--card);
    border: 1.5px solid var(--line);
    box-shadow: var(--shadow);
}
.resus-card { border-left: 5px solid var(--gold); }
.resus-card h2, .management-pivots h2, .personal-plan h2, .learning-head h2 {
    margin-top: 2px;
    font-size: 1.05rem;
    color: var(--ink);
}
.resus-card > div > p, .personal-plan > div > p {
    margin-top: 4px;
    font-size: 0.8rem;
    color: var(--ink-soft);
    line-height: 1.45;
}
.resus-grid, .pivot-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-top: 14px;
}
.resus-grid > div, .pivot-grid > div {
    padding: 13px 15px;
    border-radius: var(--radius-md);
    background: var(--bg);
    border: 1px solid var(--line);
}
.resus-grid strong, .pivot-grid span {
    display: block;
    color: var(--brand-2);
    font-size: 0.7rem;
    font-weight: 900;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}
.resus-grid p, .pivot-grid p {
    margin-top: 5px;
    font-size: 0.78rem;
    line-height: 1.5;
    color: var(--ink);
}

.pivot-title { display: flex; gap: 12px; align-items: center; }
.pivot-title > span {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    display: grid;
    place-items: center;
    background: rgba(var(--accent-rgb), 0.16);
    color: var(--brand-2);
    font-weight: 900;
    font-size: 1.1rem;
}
.pivot-title p { color: var(--ink-soft); font-size: 0.78rem; }

.personal-plan {
    background: var(--ov-job-bg);
    border-color: var(--ov-job-line);
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 12px 20px;
}
.personal-controls {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 6px;
}
.save-topic {
    padding: 8px 14px;
    border: 1.5px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--card);
    color: var(--ink);
    font: inherit;
    font-size: 0.76rem;
    font-weight: 800;
    cursor: pointer;
    min-height: var(--touch-target);
    display: inline-flex;
    align-items: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast) ease;
}
.save-topic:hover { border-color: var(--accent); }
.save-topic:active { transform: scale(0.97); }
.save-topic.active {
    color: #854d0e;
    background: var(--gold-bg);
    border-color: var(--gold);
}
html[data-theme="dark"] .save-topic.active { color: #fbbf24; }

.review-status, #noteStatus {
    color: var(--ink-soft);
    font-size: 0.7rem;
    font-weight: 700;
}
.personal-plan label, .personal-plan textarea, .note-actions { grid-column: 1 / -1; }
.personal-plan label {
    margin-top: 2px;
    color: var(--ink-soft);
    font-size: 0.72rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}
.personal-plan textarea {
    width: 100%;
    resize: vertical;
    padding: 12px 14px;
    border: 1.5px solid var(--ov-job-line);
    border-radius: var(--radius-md);
    background: var(--card);
    color: var(--ink);
    font: inherit;
    font-size: 0.84rem;
    transition: border-color var(--transition-fast) ease;
}
.personal-plan textarea:focus {
    border-color: var(--accent);
    outline: none;
    box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.18);
}
.note-actions { display: flex; align-items: center; gap: 10px; }

/* ─────────── Learning Loop / Rapid Recall ─────────── */
.learning-head {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: flex-start;
    margin-bottom: 16px;
}
.learning-head p {
    max-width: 700px;
    margin-top: 4px;
    color: var(--ink-soft);
    font-size: 0.82rem;
    line-height: 1.45;
}
.review-btn {
    flex: none;
    border: 1.5px solid var(--ov-job-line);
    border-radius: var(--radius-full);
    background: var(--card);
    color: var(--brand-2);
    padding: 8px 16px;
    font: inherit;
    font-size: 0.76rem;
    font-weight: 900;
    cursor: pointer;
    min-height: var(--touch-target);
    display: inline-flex;
    align-items: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast) ease;
}
.review-btn:hover { border-color: var(--accent); }
.review-btn:active { transform: scale(0.96); }
.review-btn[aria-pressed="true"] {
    border-color: var(--brand-2);
    background: var(--brand-2);
    color: #ffffff;
}
html[data-theme="dark"] .review-btn[aria-pressed="true"] {
    border-color: var(--accent);
    background: var(--accent);
    color: var(--on-fill);
}

.recall-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}
.recall-card {
    padding: 15px 16px;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--bg);
}
.recall-card > span {
    display: block;
    color: var(--accent);
    font-size: 0.66rem;
    font-weight: 900;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}
.recall-card p {
    min-height: 2.7em;
    margin: 6px 0 10px;
    color: var(--ink);
    font-size: 0.84rem;
    line-height: 1.45;
}
.reveal-btn {
    border: 1.5px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--card);
    color: var(--brand-2);
    padding: 7px 12px;
    font: inherit;
    font-size: 0.74rem;
    font-weight: 800;
    cursor: pointer;
    min-height: 38px;
    display: inline-flex;
    align-items: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast) ease;
}
.reveal-btn:hover { border-color: var(--accent); background: var(--home-hover); }
.reveal-btn:active { transform: scale(0.96); }
.reveal-answer {
    margin-top: 10px;
    padding: 11px 13px;
    border-left: 3px solid var(--accent);
    border-radius: 8px;
    background: var(--ov-job-bg);
    color: var(--ink);
    font-size: 0.82rem;
    line-height: 1.5;
    animation: fadeIn 0.2s var(--ease-out) both;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ─────────── Section Cards (Collapsible Accordions) ─────────── */
.section-card {
    background: var(--card);
    border: 1.5px solid var(--line);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    margin-bottom: 18px;
    overflow: hidden;
    scroll-margin-top: calc(20px + env(safe-area-inset-top, 20px));
    contain: layout style;
    transition: border-color var(--transition-fast) ease, box-shadow var(--transition-fast) ease;
}
.sec-head {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 16px 22px;
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.98rem;
    font-weight: 800;
    color: var(--ink);
    text-align: left;
    min-height: var(--touch-target);
    transition: background var(--transition-fast) ease;
}
.sec-head:hover { background: var(--bg); }
.sec-head .sec-ico {
    width: 34px;
    height: 34px;
    border-radius: var(--radius-md);
    display: grid;
    place-items: center;
    background: rgba(var(--accent-rgb), 0.14);
    font-size: 1.05rem;
    flex-shrink: 0;
}
.sec-head .arrow {
    margin-left: auto;
    transition: transform var(--transition-smooth) var(--ease-out);
    color: var(--ink-soft);
    font-size: 0.82rem;
}
.section-card.closed .arrow { transform: rotate(-90deg); }
.sec-body { padding: 4px 22px 20px; }
.section-card.closed .sec-body { display: none; }
.section-card.section-focus,
.ecg-pattern.section-focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(var(--accent-rgb), 0.2), var(--shadow-lg);
}

.sec-body ul { list-style: none; }
.sec-body > ul > li {
    padding: 8px 0 8px 24px;
    position: relative;
    font-size: 0.88rem;
    border-bottom: 1px dashed var(--line);
    line-height: 1.55;
}
.sec-body > ul > li:last-child { border-bottom: none; }
.sec-body > ul > li::before {
    content: '▸';
    position: absolute;
    left: 4px;
    color: var(--accent);
    font-weight: 800;
}
.sec-body strong { color: var(--brand-2); }
.plain-list li {
    padding: 6px 0 6px 22px;
    position: relative;
    font-size: 0.82rem;
    border-bottom: 1px dashed var(--line);
    list-style: none;
    line-height: 1.5;
}
.plain-list li:last-child { border-bottom: none; }
.plain-list li::before {
    content: '▸';
    position: absolute;
    left: 4px;
    color: var(--accent);
    font-weight: 800;
}

/* ─────────── Overview (How to Think) ─────────── */
.ov { padding: 4px 0 2px; }
.ov-job {
    background: var(--ov-job-bg);
    border: 1px solid var(--ov-job-line);
    border-left: 5px solid var(--accent);
    border-radius: var(--radius-lg);
    padding: 16px 18px;
    font-size: 1.05rem;
    font-weight: 800;
    letter-spacing: -0.015em;
    color: var(--brand-2);
    line-height: 1.4;
    margin-bottom: 16px;
}
.ov-kicker {
    display: block;
    font-size: 0.65rem;
    font-weight: 900;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 4px;
}
.ov-steps {
    list-style: none;
    display: grid;
    gap: 9px;
    margin: 0 0 16px;
}
.ov-steps li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    background: var(--bg);
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    padding: 11px 14px;
}
.ov-n {
    flex: none;
    width: 26px;
    height: 26px;
    border-radius: var(--radius-md);
    display: grid;
    place-items: center;
    background: var(--grad-brand);
    color: #ffffff;
    font-size: 0.76rem;
    font-weight: 800;
}
.ov-s {
    font-size: 0.88rem;
    line-height: 1.5;
    padding-top: 2px;
    color: var(--ink);
}
.ov-prose p {
    font-size: 0.88rem;
    color: var(--ink-soft);
    line-height: 1.6;
}
.ov-prose p + p { margin-top: 8px; }

/* ─────────── Don’t Miss DX Cards ─────────── */
.dx-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
    gap: 14px;
}
.dx-card {
    border: 1.5px solid var(--line);
    border-radius: var(--radius-md);
    padding: 15px 17px;
    border-left-width: 5px;
    background: var(--card);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-smooth) var(--ease-out),
                box-shadow var(--transition-smooth) ease;
}
.dx-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}
.dx-card.sev-critical {
    border-left-color: var(--critical);
    background: var(--critical-bg);
}
.dx-card.sev-emergent {
    border-left-color: var(--emergent);
    background: var(--emergent-bg);
}
.dx-card.sev-common {
    border-left-color: var(--common);
    background: var(--common-bg);
}
.dx-card h4 {
    font-size: 0.94rem;
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    line-height: 1.3;
}
.dx-card.sev-critical h4 { color: var(--critical); }
.dx-card.sev-emergent h4 { color: var(--emergent); }
.dx-card.sev-common h4 { color: var(--common); }
.dx-card .sev-tag {
    font-size: 0.6rem;
    font-weight: 900;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    color: #ffffff;
}
.dx-card.sev-critical .sev-tag { background: var(--critical); }
.dx-card.sev-emergent .sev-tag { background: var(--emergent); }
.dx-card.sev-common .sev-tag { background: var(--common); }
.dx-card .dx-key {
    margin-top: 8px;
    font-size: 0.82rem;
    color: var(--ink);
    line-height: 1.45;
}

/* ─────────── Clusters & Workup ─────────── */
.cluster-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
    gap: 12px;
}
.cluster {
    background: var(--bg);
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    padding: 13px 15px;
}
.cluster h4 {
    font-size: 0.74rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--brand-2);
    margin-bottom: 6px;
}
.cluster p {
    font-size: 0.84rem;
    line-height: 1.5;
    color: var(--ink);
}

.wu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 14px;
}
.wu-col {
    background: var(--bg);
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    padding: 14px 16px;
}
.wu-col h4 {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--brand-2);
    margin-bottom: 8px;
}
.wu-col ul { list-style: none; }
.wu-col li {
    font-size: 0.82rem;
    padding: 5px 0 5px 18px;
    position: relative;
    line-height: 1.5;
}
.wu-col li::before {
    content: '•';
    position: absolute;
    left: 4px;
    color: var(--accent);
    font-weight: 900;
}

/* ─────────── Interactive Red Flag Checklist ─────────── */
.rf-box {
    background: var(--rf-box-bg);
    border: 1.5px dashed var(--rf-box-line);
    border-radius: var(--radius-md);
    padding: 18px;
}
.rf-tools {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin: -2px 0 10px;
}
.rf-clear {
    border: 1.5px solid var(--rf-box-line);
    border-radius: var(--radius-full);
    background: var(--card);
    color: var(--ink-soft);
    padding: 5px 12px;
    font: inherit;
    font-size: 0.72rem;
    font-weight: 800;
    cursor: pointer;
    min-height: 36px;
    display: inline-flex;
    align-items: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast) ease;
}
.rf-clear:hover {
    border-color: var(--critical);
    color: var(--critical);
    background: var(--critical-bg);
}
.rf-clear:active { transform: scale(0.96); }

.rf-banner {
    display: none;
    margin-bottom: 14px;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-size: 0.86rem;
    font-weight: 800;
    animation: fadeIn 0.25s var(--ease-out) both;
}
.rf-banner.show { display: block; }
.rf-banner.level-high {
    background: var(--critical);
    color: #ffffff;
    box-shadow: 0 4px 14px rgba(220, 38, 38, 0.35);
}
.rf-banner.level-mid {
    background: var(--rf-mid-bg);
    color: var(--rf-mid-ink);
    border: 1px solid var(--rf-box-line);
}
.rf-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 8px 8px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast) ease;
}
.rf-item:hover { background: rgba(220, 38, 38, 0.06); }
.rf-item input {
    width: 20px;
    height: 20px;
    accent-color: var(--critical);
    margin-top: 2px;
    cursor: pointer;
    flex-shrink: 0;
}
.rf-item span {
    font-size: 0.86rem;
    line-height: 1.45;
    color: var(--ink);
}
.rf-item:has(input:checked) { background: rgba(220, 38, 38, 0.1); }
.rf-item input:checked + span {
    color: var(--critical);
    font-weight: 800;
}
.rf-progress {
    height: 8px;
    background: #fee2e2;
    border-radius: var(--radius-full);
    margin-top: 14px;
    overflow: hidden;
}
html[data-theme="dark"] .rf-progress { background: #3d1c1c; }
.rf-progress i {
    display: block;
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #f87171, var(--critical));
    border-radius: var(--radius-full);
    transition: width var(--transition-smooth) var(--ease-out);
}

/* ─────────── Disposition ─────────── */
.disp-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 14px;
}
.disp-col {
    border-radius: var(--radius-md);
    padding: 15px 17px;
    border: 1.5px solid var(--line);
    box-shadow: var(--shadow-sm);
}
.disp-col h4 {
    font-size: 0.82rem;
    font-weight: 900;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: 8px;
}
.disp-col.d-discharge { background: var(--common-bg); border-color: var(--common-line); }
.disp-col.d-discharge h4 { color: var(--common); }
.disp-col.d-admit { background: var(--emergent-bg); border-color: var(--emergent-line); }
.disp-col.d-admit h4 { color: var(--emergent); }
.disp-col.d-icu { background: var(--critical-bg); border-color: var(--critical-line); }
.disp-col.d-icu h4 { color: var(--critical); }
.disp-col ul { list-style: none; }
.disp-col li {
    font-size: 0.82rem;
    padding: 4px 0 4px 16px;
    position: relative;
    line-height: 1.5;
    color: var(--ink);
}
.disp-col li::before {
    content: '›';
    position: absolute;
    left: 4px;
    font-weight: 900;
    color: var(--ink-soft);
}

/* ─────────── Pearls & Pitfalls ─────────── */
.pp-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}
.pp-box {
    border-radius: var(--radius-md);
    padding: 16px 18px;
    box-shadow: var(--shadow-sm);
}
.pp-box h4 {
    font-size: 0.88rem;
    margin-bottom: 8px;
}
.pp-box.pearls {
    background: var(--pearls-bg);
    border: 1.5px solid var(--pearls-line);
}
.pp-box.pearls h4 { color: var(--brand-2); }
.pp-box.pitfalls {
    background: var(--pitfalls-bg);
    border: 1.5px solid var(--pitfalls-line);
}
.pp-box.pitfalls h4 { color: var(--pitfalls-ink); }
.pp-box li {
    font-size: 0.82rem;
    line-height: 1.55;
    color: var(--ink);
}

.refs { font-size: 0.8rem; color: var(--ink-soft); list-style: none; padding: 2px 0; }
.refs li { border-bottom: 1px solid var(--line-subtle) !important; padding: 8px 0 8px 22px !important; position: relative; line-height: 1.5; }
.refs li:last-child { border-bottom: none !important; }
.refs li::before {
    content: "" !important;
    position: absolute;
    left: 4px;
    top: 14px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--brand-2);
    opacity: 0.7;
}

/* ─────────── Related & Pagers ─────────── */
.related { display: flex; flex-wrap: wrap; gap: 8px; padding: 6px 0 4px; }
.related-chip {
    border: 1.5px solid var(--line);
    background: var(--card);
    border-radius: var(--radius-full);
    padding: 7px 14px;
    font-family: inherit;
    font-size: 0.82rem;
    font-weight: 700;
    cursor: pointer;
    color: var(--brand-2);
    min-height: var(--touch-target);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast) ease;
}
.related-chip:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow);
    border-color: var(--hover-line);
}
.related-chip:active { transform: scale(0.97); }

/* ─────────── ECG from scratch ─────────── */
.ecg-entry {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 14px;
    text-align: left;
    margin: 0 0 var(--space-lg);
    padding: 16px 18px;
    border: 1.5px solid var(--ov-job-line);
    border-radius: var(--radius-xl);
    background: var(--ov-job-bg);
    color: var(--ink);
    font-family: inherit;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast) ease, box-shadow var(--transition-fast) ease, border-color var(--transition-fast) ease;
}
.ecg-entry:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow);
    border-color: var(--accent);
}
.ecg-entry:active { transform: scale(0.99); }
.ecg-entry-ico {
    flex: none;
    width: 44px;
    height: 44px;
    display: grid;
    place-items: center;
    border-radius: var(--radius-md);
    background: var(--grad-brand);
    font-size: 1.25rem;
}
.ecg-entry span:not(.ecg-entry-ico) { flex: 1; min-width: 0; }
.ecg-entry strong {
    display: block;
    font-size: 0.95rem;
    color: var(--brand-2);
}
.ecg-entry small {
    display: block;
    margin-top: 2px;
    font-size: 0.76rem;
    color: var(--ink-soft);
}
.ecg-entry b { color: var(--accent); font-size: 0.9rem; }

.ecg-subhead {
    margin-top: 8px;
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.82);
    line-height: 1.45;
    max-width: 46rem;
}
.ecg-kicker {
    font-size: 0.68rem;
    font-weight: 900;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent);
    margin: 4px 0 10px;
}
.ecg-step-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 0 0 var(--space-lg);
}
.ecg-step-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 40px;
    padding: 6px 12px 6px 8px;
    border: 1.5px solid var(--line);
    border-radius: var(--radius-full);
    background: var(--card);
    color: var(--ink);
    font-family: inherit;
    font-size: 0.78rem;
    font-weight: 700;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}
.ecg-step-chip span {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    background: var(--grad-brand);
    color: #fff;
    font-size: 0.72rem;
    font-weight: 800;
}
.ecg-step-chip:hover { border-color: var(--accent); background: var(--home-hover); }

.ecg-killers {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 8px;
    margin: 0 0 var(--space-lg);
}
.ecg-killer {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    min-height: var(--touch-target);
    padding: 10px 12px;
    border: 1.5px solid var(--critical-line);
    border-left-width: 4px;
    border-radius: var(--radius-md);
    background: var(--critical-bg);
    color: var(--ink);
    font-family: inherit;
    cursor: pointer;
    text-align: left;
}
.ecg-killer strong { font-size: 0.78rem; line-height: 1.3; }
.ecg-killer small { font-size: 0.68rem; color: var(--ink-soft); }
.ecg-killer:hover { transform: translateY(-1px); box-shadow: var(--shadow-sm); }

.ecg-summary {
    font-size: 0.88rem;
    color: var(--ink-soft);
    margin: 0 0 10px;
    line-height: 1.5;
}
.ecg-details { list-style: none; }
.ecg-details > li.ecg-sub {
    padding-left: 36px;
    font-size: 0.82rem;
    color: var(--ink);
}
.ecg-details > li.ecg-sub::before { content: '–'; color: var(--ink-soft); }
.ecg-pp { margin-top: 12px; }
.ecg-pp p { font-size: 0.82rem; line-height: 1.55; color: var(--ink); }

.ecg-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 0 0 14px;
}
.ecg-pattern-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 14px;
}
.ecg-pattern {
    border: 1.5px solid var(--line);
    border-left-width: 5px;
    border-radius: var(--radius-md);
    padding: 14px 16px 16px;
    background: var(--card);
    box-shadow: var(--shadow-sm);
}
.ecg-pattern.sev-critical { border-left-color: var(--critical); }
.ecg-pattern.sev-emergent { border-left-color: var(--emergent); }
.ecg-pattern.sev-common { border-left-color: var(--common); }
.ecg-pattern header {
    display: flex;
    justify-content: space-between;
    gap: 8px;
    align-items: center;
    margin-bottom: 8px;
}
.ecg-pattern h3 {
    font-size: 0.95rem;
    line-height: 1.3;
    color: var(--ink);
}
.ecg-tagline {
    font-size: 0.76rem;
    color: var(--ink-soft);
    margin: 4px 0 10px;
}
.ecg-pattern p, .ecg-action, .ecg-caution, .ecg-leads {
    font-size: 0.8rem;
    line-height: 1.5;
    margin-top: 8px;
    color: var(--ink);
}
.ecg-cat {
    font-size: 0.65rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--accent);
}
.ecg-action {
    padding: 10px 12px;
    border-radius: var(--radius-md);
    background: var(--accent-light);
    border: 1px solid var(--ov-job-line);
}
.ecg-caution {
    padding: 8px 12px;
    border-radius: var(--radius-md);
    background: var(--pitfalls-bg);
    border: 1px solid var(--pitfalls-line);
    color: var(--pitfalls-ink);
}

.pager {
    display: flex;
    justify-content: space-between;
    gap: 14px;
    margin-top: 14px;
    flex-wrap: wrap;
}
.pager-btn {
    border: 1.5px solid var(--line);
    background: var(--card);
    border-radius: var(--radius-md);
    padding: 11px 18px;
    font-family: inherit;
    font-size: 0.84rem;
    font-weight: 700;
    cursor: pointer;
    color: var(--ink);
    min-height: var(--touch-target);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast) ease;
}
.pager-btn:hover {
    border-color: var(--hover-line);
    background: var(--home-hover);
    box-shadow: var(--shadow);
    transform: translateY(-1px);
}
.pager-btn:active { transform: scale(0.97); }

/* ─────────── Study Page & Case Practice ─────────── */
.study-tabs {
    display: flex;
    gap: 8px;
    margin: 0 0 16px;
    border-bottom: 1.5px solid var(--line);
}
.study-tabs button {
    padding: 10px 14px;
    border: 0;
    border-bottom: 3px solid transparent;
    background: transparent;
    color: var(--ink-soft);
    font: inherit;
    font-size: 0.84rem;
    font-weight: 800;
    cursor: pointer;
    min-height: var(--touch-target);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: all var(--transition-fast) ease;
}
.study-tabs button:hover { color: var(--ink); }
.study-tabs button.active {
    border-color: var(--accent);
    color: var(--brand-2);
}
.study-tabs span {
    display: inline-grid;
    place-items: center;
    min-width: 20px;
    height: 20px;
    padding: 0 5px;
    border-radius: var(--radius-full);
    background: var(--critical);
    color: #ffffff;
    font-size: 0.65rem;
    font-weight: 900;
}

.study-page, .case-practice {
    max-width: 920px;
    padding: clamp(20px, 3.5vw, 36px);
    border: 1.5px solid var(--line);
    border-radius: var(--radius-lg);
    background: var(--card);
    box-shadow: var(--shadow);
}
.study-page-head .back-btn { margin-bottom: 18px; }
.study-page-head h1 { margin-top: 4px; font-size: clamp(1.4rem, 3vw, 1.9rem); letter-spacing: -0.02em; color: var(--ink); }

.study-topic-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 12px;
    margin-top: 24px;
}
.study-topic {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    border: 1.5px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--bg);
    color: var(--ink);
    font: inherit;
    text-align: left;
    cursor: pointer;
    width: 100%;
    min-height: var(--touch-target);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast) ease;
}
.study-topic:hover {
    border-color: var(--accent);
    background: var(--home-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}
.study-topic:active { transform: scale(0.98); }
.study-topic > span { font-size: 1.3rem; flex-shrink: 0; }
.study-topic div { flex: 1; min-width: 0; }
.study-topic strong { font-size: 0.86rem; display: block; color: var(--ink); }
.study-topic small { margin-top: 2px; color: var(--ink-soft); font-size: 0.7rem; display: block; }
.study-topic b { color: var(--accent); font-size: 1.1rem; }
.study-empty {
    margin-top: 24px;
    padding: 24px;
    border-radius: var(--radius-md);
    background: var(--bg);
    color: var(--ink-soft);
    font-size: 0.86rem;
    text-align: center;
}

.case-practice-head h2 {
    margin-top: 4px;
    font-size: clamp(1.4rem, 3vw, 1.85rem);
    letter-spacing: -0.02em;
    color: var(--ink);
}
.case-practice-head p { margin-top: 6px; color: var(--ink-soft); font-size: 0.84rem; }
.case-prompt, .case-answer {
    margin-top: 20px;
    padding: 16px 18px;
    border-radius: var(--radius-md);
    background: var(--ov-job-bg);
    border: 1.5px solid var(--ov-job-line);
}
.case-prompt strong, .case-answer strong {
    color: var(--brand-2);
    font-size: 0.74rem;
    text-transform: uppercase;
    letter-spacing: 0.07em;
}
.case-prompt p, .case-answer p { margin-top: 6px; font-size: 0.86rem; line-height: 1.55; }

.quiz-question {
    margin-top: 18px;
    padding: 16px 18px;
    border: 1.5px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--bg);
}
.quiz-question legend {
    padding: 0 6px;
    font-size: 0.9rem;
    font-weight: 800;
    color: var(--ink);
}
.quiz-question legend span {
    display: inline-grid;
    place-items: center;
    width: 22px;
    height: 22px;
    margin-right: 8px;
    border-radius: 50%;
    background: var(--brand-2);
    color: #ffffff;
    font-size: 0.7rem;
    font-weight: 900;
}
.quiz-options { display: grid; gap: 8px; margin-top: 10px; }
.quiz-option {
    padding: 11px 14px;
    border: 1.5px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--card);
    color: var(--ink);
    font: inherit;
    font-size: 0.82rem;
    text-align: left;
    cursor: pointer;
    width: 100%;
    min-height: var(--touch-target);
    display: flex;
    align-items: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast) ease;
}
.quiz-option:hover {
    border-color: var(--accent);
    background: var(--home-hover);
    transform: translateY(-1px);
}
.quiz-option:active { transform: scale(0.98); }
.quiz-option.correct {
    border-color: var(--common);
    background: var(--common-bg);
    color: var(--common);
    font-weight: 800;
}
.quiz-option.incorrect {
    border-color: var(--critical);
    background: var(--critical-bg);
    color: var(--critical);
}
.quiz-feedback {
    min-height: 1.4em;
    margin-top: 8px;
    color: var(--ink-soft);
    font-size: 0.76rem;
    font-weight: 700;
}
.study-actions { display: flex; gap: 10px; margin-top: 20px; flex-wrap: wrap; }

/* ─────────── Shift View ─────────── */
.shift-topline {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 0 auto 14px;
    max-width: 1140px;
}
.shift-topline label {
    margin-left: auto;
    color: var(--ink-soft);
    font-size: 0.72rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}
.shift-topline select {
    max-width: 280px;
    padding: 8px 12px;
    border: 1.5px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--card);
    color: var(--ink);
    font: inherit;
    font-size: 0.8rem;
    min-height: var(--touch-target);
    box-shadow: var(--shadow-sm);
}
.shift-topline select:focus { border-color: var(--accent); outline: none; }
.shift-sheet {
    max-width: 1140px;
    margin: 0 auto;
    padding: clamp(18px, 3.5vw, 32px);
    border: 1.5px solid var(--line);
    border-radius: var(--radius-lg);
    background: var(--card);
    box-shadow: var(--shadow-lg);
}
.shift-sheet-head {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: flex-start;
}
.shift-sheet-head h1 { margin-top: 3px; font-size: clamp(1.5rem, 3.2vw, 2.2rem); letter-spacing: -0.02em; color: var(--ink); }
.shift-sheet-head p { margin-top: 4px; color: var(--ink-soft); font-size: 0.86rem; }
.shift-warning {
    margin: 18px 0;
    padding: 11px 15px;
    border-radius: var(--radius-md);
    background: var(--pitfalls-bg);
    border: 1.5px solid var(--pitfalls-line);
    color: var(--pitfalls-ink);
    font-size: 0.76rem;
    font-weight: 800;
}
.shift-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}
.shift-grid section {
    padding: 16px 18px;
    border-radius: var(--radius-md);
    border: 1.5px solid var(--line);
    background: var(--bg);
}
.shift-grid h2 {
    margin-bottom: 10px;
    color: var(--brand-2);
    font-size: 0.88rem;
}
.shift-grid li, .shift-grid p {
    margin: 6px 0 0 16px;
    font-size: 0.8rem;
    line-height: 1.5;
    color: var(--ink);
}
.shift-grid li small { color: var(--ink-soft); }
.shift-red {
    border-color: var(--rf-box-line) !important;
    background: var(--rf-box-bg) !important;
}
.shift-red h2 { color: var(--critical); }
.shift-disposition { grid-column: 1 / -1; }
.shift-disposition > div {
    display: inline-block;
    vertical-align: top;
    width: min(48%, 460px);
    margin: 4px 1.5% 0 0;
    padding: 10px 12px;
    border-left: 3px solid var(--accent);
    border-radius: 4px;
    background: var(--card);
}
.shift-disposition p { margin-left: 0; }

/* ─────────── Screen Reader Only ─────────── */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ─────────── Responsive Media Queries ─────────── */
@media (max-width: 1700px) and (min-width: 921px) {
    .topbar { flex-wrap: wrap; }
    .topbar-tools { order: 1; }
    .searchwrap { order: 2; flex: 1 0 100%; max-width: none; }
}

@media (max-width: 920px) {
    .sidebar {
        transform: translateX(-105%);
        transition: transform var(--transition-smooth) var(--ease-out);
    }
    .sidebar.open {
        transform: translateX(0);
        box-shadow: var(--shadow-float);
    }
    .main { margin-left: 0; }
    .burger { display: inline-flex; }
    .tools-toggle { display: inline-flex; }

    .topbar {
        display: grid;
        grid-template-columns: 44px 44px 44px 44px 44px 1fr;
        gap: 8px;
        padding: max(10px, env(safe-area-inset-top, 10px)) 16px 10px;
    }
    .burger { grid-column: 1; grid-row: 1; }
    .home-btn {
        grid-column: 2;
        grid-row: 1;
        width: 44px;
        min-width: 44px;
        padding: 0;
        overflow: hidden;
        display: grid;
        place-items: center;
        font-size: 1rem;
    }
    .home-btn .header-label { display: none; }
    .home-btn .header-icon { margin: 0; }
    .utility-btn {
        display: grid;
        width: 44px;
        min-width: 44px;
        padding: 0;
        font-size: 1rem;
        place-items: center;
    }
    #studyBtn { grid-column: 3; grid-row: 1; }
    #shiftBtn { grid-column: 4; grid-row: 1; }
    #ecgBtn { grid-column: 5; grid-row: 1; }
    .tools-toggle {
        grid-column: 6;
        grid-row: 1;
        justify-self: end;
        min-width: 44px;
    }
    .searchwrap {
        grid-column: 1 / -1;
        grid-row: 2;
        max-width: none;
        position: relative;
    }

    .topbar-tools {
        display: none;
        grid-column: 1 / -1;
        grid-row: 3;
        align-items: flex-start;
        gap: 12px;
        padding: 14px;
        background: var(--card);
        border: 1.5px solid var(--line);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-lg);
        margin-top: 4px;
        animation: popIn 0.2s var(--ease-out) both;
    }
    .topbar-tools.open {
        display: grid;
        grid-template-columns: 1fr;
        width: 100%;
        min-width: 0;
    }
    .chips {
        width: 100%;
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 8px;
    }
    .chip {
        width: 100%;
        justify-content: center;
        padding-inline: 10px;
        white-space: nowrap;
    }
    .pref-tools {
        justify-content: center;
        width: 100%;
    }
    .accent-tools {
        justify-content: center;
        width: 100%;
        flex-wrap: wrap;
    }

    .case-rail { grid-template-columns: 1fr; gap: 12px; padding: 16px; }
    .case-steps { display: grid; grid-template-columns: 1fr; gap: 8px; }
    .case-actions { grid-column: auto; justify-content: flex-start; }
    .learning-loop { padding: 18px; }
    .learning-head { align-items: stretch; flex-direction: column; }
    .review-btn { align-self: flex-start; }
    .recall-grid { grid-template-columns: 1fr; }
    .pp-grid { grid-template-columns: 1fr; }
    .study-dashboard { align-items: stretch; flex-direction: column; padding: 18px; }
    .study-stats { justify-content: stretch; }
    .study-stat { flex: 1; }
    .resus-grid, .pivot-grid { grid-template-columns: 1fr; }
    .personal-plan { grid-template-columns: 1fr; }
    .personal-controls { align-items: flex-start; }

    .shift-topline { display: grid; grid-template-columns: 1fr; gap: 8px; align-items: start; }
    .shift-topline .back-btn { justify-self: start; }
    .shift-topline label { margin: 4px 0 0; }
    .shift-topline select { width: 100%; max-width: none; min-width: 0; }
    .shift-sheet-head { flex-direction: column; }
    .shift-grid { grid-template-columns: 1fr; }
    .shift-disposition { grid-column: auto; }
    .shift-disposition > div { display: block; width: 100%; margin: 6px 0 0; }
    .stage { padding: 20px 16px 36px; }
    .ecg-pattern-grid, .ecg-killers { grid-template-columns: 1fr; }
    .ecg-step-nav { overflow-x: auto; flex-wrap: nowrap; padding-bottom: 4px; }
    .ecg-step-chip { flex: none; }
}

@media (max-width: 480px) {
    .home-btn { padding: 0; }
    .tools-toggle .header-label { display: none; }
    .tools-toggle { width: 44px; min-width: 44px; padding: 0; }
    .case-action { flex: 1; text-align: center; justify-content: center; }
    .study-tabs { overflow-x: auto; }
    .study-actions { flex-direction: column; }
    .study-actions .btn, .study-actions .back-btn, .study-actions .rf-clear, .study-actions .review-btn { width: 100%; justify-content: center; }
    .cp-hero .back-btn {
        position: static;
        margin-bottom: 14px;
        display: inline-flex;
    }
    .cp-grid { grid-template-columns: 1fr; }
    .chips { grid-template-columns: 1fr 1fr; }
    .dx-grid, .study-topic-list { grid-template-columns: minmax(0, 1fr); }
    .pref-tools {
        display: grid;
        grid-template-columns: repeat(5, minmax(0, 1fr));
        min-width: 0;
        max-width: 100%;
    }
    .pref-btn { width: 100%; min-width: 0; padding-inline: 4px; }
    .pref-scale { min-width: 0; }
}

@media (max-width: 360px) {
    .topbar { grid-template-columns: 40px 40px 40px 40px 40px 1fr; gap: 6px; }
    .home-btn, .tools-toggle, .icon-btn, .utility-btn { width: 40px; min-width: 40px; }
    .searchwrap { padding-inline: 10px; }
    #searchInput { font-size: 0.82rem; }
}

/* ─────────── Print Optimization (accent-aware, always light for paper) ─────────── */
@media print {
    .sidebar, .topbar, .toast, .side-backdrop, .back-btn, .home-btn, .pref-tools, .accent-tools, .case-rail,
    .sec-head .arrow, .pager, .related, .rf-tools, .shift-topline, .study-tabs, .study-actions,
    .personal-controls, .note-actions, .reveal-btn, .ecg-filters, .ecg-step-nav, .ecg-killers, .ecg-entry { display: none !important; }
    .main { margin: 0; }
    .section-card { break-inside: avoid; box-shadow: none; border-color: #ddd; }
    .sec-body { display: block !important; }
    .section-card.closed .sec-body { display: block; }
    .reveal-answer { display: block !important; }
    html { font-size: 14px !important; }
    html, html[data-theme="dark"] {
        --bg: #fff; --ink: #111; --ink-soft: #444; --line: #ddd; --card: #fff;
        --topbar-bg: #fff; --foot-bg: #fff;
        --ov-job-bg: #f4f7f6; --ov-job-line: #cde9de;
        --critical-bg: #fef2f2; --emergent-bg: #fff7ed; --common-bg: #f0fdf4;
        --pearls-bg: #f0fbf6; --pitfalls-bg: #fdf6ec;
    }
    /* Force light readable brand per chosen accent when printing from dark mode */
    html[data-accent="emerald"], html[data-accent="emerald"][data-theme="dark"] { --brand: #0b3d2e; --brand-2: #115743; --accent: #0f9d76; }
    html[data-accent="ocean"], html[data-accent="ocean"][data-theme="dark"] { --brand: #0b2e5e; --brand-2: #1d4fa1; --accent: #2563eb; }
    html[data-accent="violet"], html[data-accent="violet"][data-theme="dark"] { --brand: #2e1a6b; --brand-2: #5b34c4; --accent: #7c3aed; }
    html[data-accent="rose"], html[data-accent="rose"][data-theme="dark"] { --brand: #5c0f22; --brand-2: #a51c3a; --accent: #e11d48; }
    html[data-accent="amber"], html[data-accent="amber"][data-theme="dark"] { --brand: #4d2405; --brand-2: #9a4a0a; --accent: #d97706; }
    html[data-accent="teal"], html[data-accent="teal"][data-theme="dark"] { --brand: #07333b; --brand-2: #0c6a82; --accent: #0891b2; }
    html:not([data-accent]) { --brand: #0b3d2e; --brand-2: #115743; --accent: #0f9d76; }
    body { background: #fff; color: #111; }
    .cp-card, .dx-card, .wu-col, .disp-col, .resus-card, .management-pivots, .ecg-pattern { break-inside: avoid; }
}

/* ─────────── Reduced Motion ─────────── */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ─────────── High Contrast & Forced Colors ─────────── */
@media (forced-colors: active) {
    .btn, .chip, .home-btn, .side-item, .cp-card, .dx-card, .section-card {
        border: 1.5px solid ButtonText;
    }
    .chip.active, .home-btn.on-home {
        background: Highlight;
        color: HighlightText;
    }
    .cp-card::before { background: Highlight; }
}

/* ─────────── Landscape Mobile ─────────── */
@media (max-height: 500px) and (orientation: landscape) {
    .stage { padding: 12px clamp(14px, 2.5vw, 28px); }
    .hero { padding: 18px clamp(16px, 2.5vw, 30px); margin-bottom: 14px; }
    .cp-hero { padding: 18px clamp(16px, 2.5vw, 28px); margin-bottom: 12px; }
    .section-card { margin-bottom: 12px; }
    .sec-head { padding: 12px 16px; }
    .sec-body { padding: 2px 16px 14px; }
}

/* ─────────── Educational Disclaimer Dialog ─────────── */
.disclaimer-overlay {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(4, 14, 10, 0.82);
    -webkit-backdrop-filter: blur(14px) saturate(1.4);
    backdrop-filter: blur(14px) saturate(1.4);
    display: grid;
    place-items: center;
    padding: 20px;
    overflow-y: auto;
    animation: fadeInOverlay 0.25s var(--ease-out) both;
}
.disclaimer-overlay[hidden] {
    display: none !important;
}
@keyframes fadeInOverlay {
    from { opacity: 0; }
    to { opacity: 1; }
}

.disclaimer-modal {
    width: 100%;
    max-width: 580px;
    background: var(--card);
    border: 2px solid var(--accent);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-float);
    padding: 28px clamp(20px, 4vw, 36px);
    display: flex;
    flex-direction: column;
    gap: 18px;
    animation: springModal 0.35s var(--ease-spring) both;
    position: relative;
}
@keyframes springModal {
    from { opacity: 0; transform: translateY(24px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.disclaimer-header {
    text-align: center;
}
.disclaimer-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    background: var(--gold-bg);
    border: 1px solid var(--gold);
    color: var(--gold);
    font-size: 0.72rem;
    font-weight: 900;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: 10px;
}
.disclaimer-header h2 {
    font-size: clamp(1.25rem, 3vw, 1.6rem);
    letter-spacing: -0.02em;
    color: var(--ink);
    line-height: 1.25;
}
.disclaimer-sub {
    font-size: 0.82rem;
    color: var(--ink-soft);
    margin-top: 6px;
    line-height: 1.45;
}

.disclaimer-body {
    display: flex;
    flex-direction: column;
    gap: 14px;
}
.disclaimer-callout {
    padding: 12px 14px;
    border-radius: var(--radius-md);
    background: var(--ov-job-bg);
    border: 1px solid var(--ov-job-line);
    border-left: 4px solid var(--accent);
    font-size: 0.84rem;
    line-height: 1.45;
    color: var(--brand-2);
}
.disclaimer-points {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.disclaimer-points li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    background: var(--bg);
    border: 1px solid var(--line);
}
.disclaimer-points .point-ico {
    font-size: 1.2rem;
    line-height: 1;
    flex-shrink: 0;
    margin-top: 2px;
}
.disclaimer-points strong {
    display: block;
    font-size: 0.82rem;
    color: var(--ink);
}
.disclaimer-points p {
    font-size: 0.76rem;
    color: var(--ink-soft);
    margin-top: 2px;
    line-height: 1.45;
}

.disclaimer-agree-label {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 14px;
    border-radius: var(--radius-md);
    border: 1.5px solid var(--line);
    background: var(--bg);
    cursor: pointer;
    transition: all var(--transition-fast) ease;
}
.disclaimer-agree-label:hover {
    border-color: var(--accent);
    background: var(--home-hover);
}
.disclaimer-agree-label input {
    width: 20px;
    height: 20px;
    accent-color: var(--accent);
    margin-top: 2px;
    cursor: pointer;
    flex-shrink: 0;
}
.disclaimer-agree-label span {
    font-size: 0.82rem;
    line-height: 1.45;
    color: var(--ink);
    font-weight: 600;
}
.disclaimer-agree-label:has(input:checked) {
    border-color: var(--accent);
    background: var(--accent-light);
}
.disclaimer-agree-label input:checked + span {
    color: var(--brand-2);
    font-weight: 800;
}

.disclaimer-footer {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 4px;
}
.disclaimer-btn {
    width: 100%;
    padding: 13px 20px;
    border-radius: var(--radius-md);
    border: 0;
    background: var(--brand-2);
    color: #ffffff;
    font-family: inherit;
    font-size: 0.92rem;
    font-weight: 800;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 48px;
    box-shadow: 0 4px 14px rgba(var(--shadow-rgb), 0.35);
    transition: all var(--transition-fast) ease;
}
html[data-theme="dark"] .disclaimer-btn {
    background: var(--accent);
    color: var(--on-fill);
    box-shadow: 0 4px 18px rgba(var(--accent-rgb), 0.35);
}
.disclaimer-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(var(--shadow-rgb), 0.45);
}
.disclaimer-btn:active:not(:disabled) {
    transform: scale(0.98);
}
.disclaimer-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}
.disclaimer-btn .btn-arrow {
    font-size: 1.1rem;
    transition: transform var(--transition-fast) ease;
}
.disclaimer-btn:hover:not(:disabled) .btn-arrow {
    transform: translateX(4px);
}

.disclaimer-link-btn {
    margin-top: 6px;
    border-color: rgba(255, 255, 255, 0.2);
    color: var(--side-muted);
}

/* ══════════ EM-CPs UI/UX Hardening v4 — cross-browser, buttons, responsive ══════════
   Layered AFTER base styles so it safely overrides without rewriting v3.
   Targets: Chrome / Edge / Firefox / Safari (macOS, iOS, Android), PWA standalone,
   keyboard, touch, screen-reader, print/PDF, reduced-motion, forced-colors. */

/* ── 1. Cross-browser base ── */
html {
  font-size: 16px; /* fallback for browsers without var()/calc */
  font-size: calc(16px * var(--type-scale, 1));
  color-scheme: light;
}
body {
  min-height: 100vh; /* fallback */
  min-height: 100svh;
  min-height: 100dvh;
  overflow-wrap: break-word;
  word-wrap: break-word;
}
.main {
  min-height: 100vh;
  min-height: 100svh;
  min-height: 100dvh;
}
/* Button / form normalization for Safari, Firefox, old Edge */
button, input, select, textarea {
  font: inherit;
  color: inherit;
}
button {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
  touch-action: manipulation;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
button::-moz-focus-inner, input::-moz-focus-inner, select::-moz-focus-inner {
  border: 0;
  padding: 0;
}
input[type="search"] {
  -webkit-appearance: none;
  appearance: none;
}
input[type="search"]::-webkit-search-decoration,
input[type="search"]::-webkit-search-cancel-button,
input[type="search"]::-webkit-search-results-button,
input[type="search"]::-webkit-search-results-decoration {
  display: none;
  -webkit-appearance: none;
}
img, svg { max-width: 100%; }
a { color: inherit; }

/* Focus: visible ring with fallback for browsers without :focus-visible */
:focus { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
:focus:not(:focus-visible) { outline: none; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
@supports not selector(:focus-visible) {
  :focus { outline: 2px solid var(--accent); outline-offset: 3px; }
}
/* High-visibility keyboard focus for all interactive controls */
.home-btn:focus-visible, .utility-btn:focus-visible, .icon-btn:focus-visible,
.chip:focus-visible, .pref-btn:focus-visible,
.tools-toggle:focus-visible, .side-item:focus-visible, .side-btn:focus-visible,
.cp-card:focus-visible, .sec-head:focus-visible, .back-btn:focus-visible,
.pager-btn:focus-visible, .related-chip:focus-visible, .quiz-option:focus-visible,
.study-topic:focus-visible, .study-stat:focus-visible, .patient-chip:focus-visible,
.case-action:focus-visible, .reveal-btn:focus-visible, .review-btn:focus-visible,
.save-topic:focus-visible, .rf-clear:focus-visible, .search-clear-btn:focus-visible,
.res-item:focus-visible, .disclaimer-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(var(--accent-rgb),0.22), var(--shadow-sm);
}

/* ── 2. Professional button system ── */
/* Shared pressable behaviour */
.home-btn, .utility-btn, .icon-btn, .tools-toggle,
.btn, .back-btn, .chip, .pref-btn,
.side-btn, .side-item, .cp-card, .study-stat, .patient-chip,
.case-action, .reveal-btn, .review-btn, .save-topic, .rf-clear,
.related-chip, .pager-btn, .quiz-option, .study-topic,
.search-clear-btn, .res-item, .disclaimer-btn {
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
/* Disabled / aria-disabled unified */
button:disabled, button[disabled], button[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: var(--shadow-sm);
}
.quiz-option:disabled { opacity: 1; cursor: default; }
.quiz-option.correct:disabled, .quiz-option.incorrect:disabled { opacity: 1; }
/* Prevent text overflow on small screens for all pill buttons */
.chip, .patient-chip, .related-chip, .case-action,
.home-btn, .back-btn, .pager-btn, .review-btn {
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
}
/* Consistent hover lift only on devices that can hover */
@media (hover: hover) and (pointer: fine) {
  .home-btn:hover, .pager-btn:hover, .related-chip:hover,
  .study-topic:hover, .quiz-option:not(:disabled):hover {
    transform: translateY(-1px);
  }
  .cp-card:hover { transform: translateY(-4px); }
}
@media (hover: none) {
  .home-btn:hover, .cp-card:hover, .chip:hover, .patient-chip:hover,
  .related-chip:hover, .pager-btn:hover { transform: none; }
}
/* Active nav state for Study / Shift / ECG (mirrors .on-home) */
.home-btn.active-nav {
  background: var(--brand-2);
  color: #fff;
  border-color: var(--brand-2);
  box-shadow: 0 2px 8px rgba(var(--shadow-rgb),0.25);
}
html[data-theme="dark"] .home-btn.active-nav {
  background: var(--accent);
  color: var(--on-fill);
  border-color: var(--accent);
  box-shadow: 0 2px 10px rgba(var(--accent-rgb),0.3);
}
/* Ensure utility icons align perfectly */
.home-btn .header-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.2em;
  height: 1.2em;
  line-height: 1;
  flex: none;
}

/* ── 3. Topbar cross-browser + sticky fallback ── */
.topbar {
  position: -webkit-sticky;
  position: sticky;
}
/* If backdrop-filter unsupported, use solid background */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .topbar { background: var(--card); }
  .toast { background: var(--card); }
  .cp-hero .back-btn { background: rgba(255,255,255,0.28); }
}
.topbar-tools { min-width: 0; }
/* Prevent search from collapsing too small on desktop */
.searchwrap { min-width: 180px; }
#searchInput { min-width: 0; }
/* Search dropdown must stay inside viewport on all browsers */
.results-pop {
  left: 0; right: 0;
  max-width: 100%;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

/* ── 4. Sidebar: visibility fallback for no-inert browsers ── */
@media (max-width: 920px) {
  .sidebar {
    visibility: hidden;
    -webkit-transform: translateX(-105%);
    transform: translateX(-105%);
  }
  .sidebar.open {
    visibility: visible;
    -webkit-transform: translateX(0);
    transform: translateX(0);
  }
}
@media (min-width: 921px) {
  .sidebar { visibility: visible; }
}
/* Sidebar focus: hide scrollbars cleanly, keep scroll */
.sidebar {
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

/* ── 5. Stage readability: constrain line length on ultra-wide ── */
.stage > * {
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
  width: 100%;
}
.stage > .shift-topline, .stage > .shift-sheet { max-width: 1140px; }
.stage > .study-page, .stage > .case-practice { max-width: 920px; margin-left: auto; margin-right: auto; }

/* ── 6. :has() fallback — JS toggles .is-checked alongside :checked ── */
.rf-item.is-checked { background: rgba(220,38,38,0.10); }
.rf-item.is-checked span { color: var(--critical); font-weight: 800; }
.disclaimer-agree-label.is-checked {
  border-color: var(--accent);
  background: var(--accent-light);
}
.disclaimer-agree-label.is-checked span { color: var(--brand-2); font-weight: 800; }
@supports selector(:has(*)) {
  /* native :has rules from v3 remain authoritative */
}

/* ── 7. Clamp() fallbacks for older browsers ── */
.hero h1 { font-size: 1.7rem; font-size: clamp(1.5rem, 3.2vw, 2.2rem); }
.cp-hero h1 { font-size: 1.6rem; font-size: clamp(1.45rem, 2.8vw, 2rem); }
.study-page-head h1, .case-practice-head h2 { font-size: 1.5rem; font-size: clamp(1.4rem, 3vw, 1.9rem); }
.shift-sheet-head h1 { font-size: 1.7rem; font-size: clamp(1.5rem, 3.2vw, 2.2rem); }
.stage { padding: 32px 24px 40px; padding: var(--space-2xl) clamp(16px, 4vw, 48px) var(--space-3xl); }
.hero, .cp-hero { padding-left: 24px; padding-right: 24px; }

/* ── 8. Grid fallbacks: flex when grid unsupported ── */
@supports not (display: grid) {
  .cp-grid, .dx-grid, .cluster-grid, .wu-grid, .disp-grid,
  .resus-grid, .pivot-grid, .recall-grid, .pp-grid,
  .study-topic-list, .shift-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
  }
  .cp-grid > *, .dx-grid > *, .cluster-grid > *, .wu-grid > *,
  .disp-grid > *, .resus-grid > *, .pivot-grid > *,
  .recall-grid > *, .pp-grid > *, .shift-grid > * {
    flex: 1 1 260px;
    min-width: 0;
  }
  .case-rail, .case-steps { display: block; }
  .case-steps li { margin-bottom: 8px; }
}

/* ── 9. ECG view — professional, matches design system ── */
.ecg-hero {
  border-radius: var(--radius-xl);
  padding: 28px clamp(20px, 3.5vw, 40px);
  padding: 28px 24px;
  padding: 28px clamp(20px, 3.5vw, 40px);
  margin-bottom: var(--space-lg);
  background: var(--grad-brand);
  color: #ffffff;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.10);
}
.ecg-hero::after {
  content: '';
  position: absolute;
  right: -50px; top: -50px;
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(var(--accent-rgb),0.32) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.ecg-hero h1 { font-size: 1.6rem; font-size: clamp(1.45rem, 2.8vw, 2rem); letter-spacing: -0.02em; line-height: 1.2; color: #fff; position: relative; z-index: 1; }
.ecg-hero .tag { color: rgba(255,255,255,0.86); font-size: 0.92rem; margin-top: 6px; line-height: 1.5; position: relative; z-index: 1; }
.ecg-hero .back-btn {
  position: absolute; top: 20px; right: 20px;
  background: rgba(255,255,255,0.16); color: #fff;
  border: 1px solid rgba(255,255,255,0.32);
  border-radius: var(--radius-full);
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
}
.ecg-hero .back-btn:hover { background: rgba(255,255,255,0.28); }
.ecg-meta {
  display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; position: relative; z-index: 1;
}
.ecg-firstpass, .ecg-redflags, .ecg-steps-card, .ecg-patterns, .ecg-pearls-pitfalls {
  background: var(--card);
  border: 1.5px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  margin-bottom: 18px;
  padding: 20px 24px;
}
.ecg-firstpass { border-left: 5px solid var(--accent); }
.ecg-redflags { border: 1.5px dashed var(--rf-box-line); background: var(--rf-box-bg); }
.ecg-firstpass h2, .ecg-redflags h2, .ecg-steps-card h2, .ecg-patterns h2 { font-size: 1.05rem; color: var(--ink); margin-top: 2px; }
.ecg-kicker {
  display: block; color: var(--accent);
  font-size: 0.67rem; font-weight: 900; letter-spacing: 0.12em; text-transform: uppercase;
}
.ecg-redflags h2 { color: var(--critical); }
.ecg-firstpass ol, .ecg-redflags ul { list-style: none; margin-top: 12px; display: grid; gap: 8px; }
.ecg-firstpass li {
  display: flex; gap: 12px; align-items: flex-start;
  background: var(--bg); border: 1px solid var(--line);
  border-radius: var(--radius-md); padding: 11px 14px; font-size: 0.86rem; line-height: 1.5;
}
.ecg-firstpass .ov-n { flex: none; }
.ecg-redflags li {
  font-size: 0.84rem; line-height: 1.5; padding: 8px 0 8px 24px; position: relative;
  border-bottom: 1px dashed var(--line); color: var(--ink);
}
.ecg-redflags li:last-child { border-bottom: none; }
.ecg-redflags li::before {
  content: ""; position: absolute; left: 4px; top: 14px;
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--critical); box-shadow: 0 0 0 3px var(--critical-bg);
}
.ecg-step { border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--bg); margin-top: 12px; overflow: hidden; }
.ecg-step-head {
  display: flex; align-items: center; gap: 12px; width: 100%;
  padding: 14px 18px; background: none; border: none; cursor: pointer;
  font-family: inherit; font-size: 0.95rem; font-weight: 800; color: var(--ink); text-align: left;
  min-height: var(--touch-target);
}
.ecg-step-head:hover { background: var(--home-hover); }
.ecg-step-head .sec-ico {
  width: 34px; height: 34px; border-radius: var(--radius-md);
  display: grid; place-items: center; flex: none;
  background: rgba(var(--accent-rgb),0.14); font-size: 1.05rem;
}
.ecg-step-head .arrow { margin-left: auto; color: var(--ink-soft); font-size: 0.82rem; transition: transform 280ms cubic-bezier(0.16,1,0.3,1); }
.ecg-step.closed .arrow { -webkit-transform: rotate(-90deg); transform: rotate(-90deg); }
.ecg-step-body { padding: 4px 18px 18px; }
.ecg-step.closed .ecg-step-body { display: none; }
.ecg-step-body ul { list-style: none; }
.ecg-step-body li { font-size: 0.85rem; line-height: 1.6; padding: 7px 0 7px 24px; position: relative; border-bottom: 1px dashed var(--line); color: var(--ink); }
.ecg-step-body li:last-child { border-bottom: none; }
.ecg-step-body li::before { content: '▸'; position: absolute; left: 4px; color: var(--accent); font-weight: 800; }
.ecg-pearl, .ecg-pitfall {
  margin-top: 10px; padding: 11px 13px; border-radius: 8px; font-size: 0.82rem; line-height: 1.5;
}
.ecg-pearl { border-left: 3px solid var(--common); background: var(--common-bg); color: var(--ink); }
.ecg-pitfall { border-left: 3px solid var(--gold); background: var(--gold-bg); background: var(--pitfalls-bg); color: var(--ink); }
.ecg-pattern-filter { display: flex; gap: 8px; flex-wrap: wrap; margin: 14px 0 4px; }
.ecg-pattern-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 14px; margin-top: 14px; }
.ecg-pattern {
  border: 1.5px solid var(--line); border-radius: var(--radius-md);
  padding: 15px 17px; border-left-width: 5px; background: var(--card);
  box-shadow: var(--shadow-sm);
}
.ecg-pattern.sev-critical { border-left-color: var(--critical); background: var(--critical-bg); }
.ecg-pattern.sev-emergent { border-left-color: var(--emergent); background: var(--emergent-bg); }
.ecg-pattern h4 { font-size: 0.92rem; line-height: 1.3; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.ecg-pattern.sev-critical h4 { color: var(--critical); }
.ecg-pattern.sev-emergent h4 { color: var(--emergent); }
.ecg-pattern dl { margin-top: 10px; display: grid; gap: 6px; font-size: 0.8rem; line-height: 1.5; }
.ecg-pattern dt { font-weight: 800; font-size: 0.68rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--brand-2); }
.ecg-pattern dd { color: var(--ink); }
.ecg-pattern dd + dt { margin-top: 4px; }
.ecg-refs { font-size: 0.8rem; color: var(--ink-soft); list-style: none; padding: 2px 0; }
.ecg-refs li { border-bottom: 1px solid var(--line-subtle) !important; padding: 8px 0 8px 22px !important; position: relative; list-style: none; line-height: 1.5; }
.ecg-refs li:last-child { border-bottom: none !important; }
.ecg-refs li::before {
  content: "" !important;
  position: absolute;
  left: 4px;
  top: 14px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--brand-2);
  opacity: 0.7;
}

/* ── 10. Toast, dialog, search polish for small screens ── */
.toast {
  max-width: min(90vw, 560px);
  overflow-wrap: anywhere;
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
}
.disclaimer-modal {
  max-height: calc(100vh - 40px);
  max-height: calc(100dvh - 40px);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}
.disclaimer-overlay { -webkit-overflow-scrolling: touch; overscroll-behavior: contain; }
.search-kbd { -webkit-user-select: none; user-select: none; }
@media (max-width: 480px) {
  .search-kbd { display: none; }
  .toast { font-size: 0.8rem; padding: 10px 18px; bottom: calc(16px + env(safe-area-inset-bottom, 0px)); }
  .disclaimer-modal { padding: 22px 18px; gap: 14px; }
  .ecg-hero .back-btn, .cp-hero .back-btn { position: static; margin-bottom: 14px; }
  .ecg-firstpass, .ecg-redflags, .ecg-steps-card, .ecg-patterns { padding: 16px; }
  .ecg-pattern-grid { grid-template-columns: minmax(0, 1fr); }
}

/* ── 11. Responsive topbar FIX — include ECG in mobile grid ── */
@media (max-width: 920px) {
  .topbar {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 44px 44px 44px 44px 44px 1fr;
    grid-template-columns: 44px 44px 44px 44px 44px 1fr;
  }
  .burger { -ms-grid-column: 1; grid-column: 1; grid-row: 1; }
  #homeBtn { -ms-grid-column: 2; grid-column: 2; grid-row: 1; }
  #studyBtn { -ms-grid-column: 3; grid-column: 3; grid-row: 1; }
  #shiftBtn { -ms-grid-column: 4; grid-column: 4; grid-row: 1; }
  #ecgBtn { -ms-grid-column: 5; grid-column: 5; grid-row: 1; }
  .tools-toggle { -ms-grid-column: 6; grid-column: 6; grid-row: 1; }
  #homeBtn, #studyBtn, #shiftBtn, #ecgBtn {
    width: 44px; min-width: 44px; padding: 0;
    overflow: hidden; display: grid; place-items: center; font-size: 1rem;
  }
  #homeBtn .header-label, #studyBtn .header-label,
  #shiftBtn .header-label, #ecgBtn .header-label { display: none; }
  #homeBtn .header-icon, #studyBtn .header-icon,
  #shiftBtn .header-icon, #ecgBtn .header-icon { margin: 0; }
}
@media (max-width: 360px) {
  .topbar { -ms-grid-columns: 40px 40px 40px 40px 40px 1fr; grid-template-columns: 40px 40px 40px 40px 40px 1fr; gap: 6px; }
  #homeBtn, #studyBtn, #shiftBtn, #ecgBtn, .tools-toggle, .icon-btn, .burger { width: 40px; min-width: 40px; }
}
/* Desktop: keep nav compact, search flexible, tools right */
@media (min-width: 921px) {
  .topbar { flex-wrap: wrap; }
  #homeBtn, #studyBtn, #shiftBtn, #ecgBtn { flex: none; }
  .searchwrap { flex: 1 1 220px; }
  .topbar-tools { flex: 0 1 auto; }
}

/* ── 12. Print: include ECG, keep clinical tables intact ── */
@media print {
  .ecg-hero { background: #fff !important; color: #111 !important; border: 1px solid #ddd; box-shadow: none; }
  .ecg-hero h1, .ecg-hero .tag { color: #111 !important; }
  .ecg-firstpass, .ecg-redflags, .ecg-steps-card, .ecg-patterns, .ecg-step { box-shadow: none; break-inside: avoid; }
  .ecg-step-body, .ecg-step.closed .ecg-step-body { display: block !important; }
  .ecg-pattern { break-inside: avoid; box-shadow: none; }
  .tools-toggle, #studyBtn, #shiftBtn, #ecgBtn, #homeBtn, .burger { display: none !important; }
}

/* ── 13. Motion + contrast ── */
@media (prefers-reduced-motion: reduce) {
  .ecg-step-head .arrow, .cp-card::before, .toast, .disclaimer-modal, .results-pop { animation: none !important; transition: none !important; }
}
@media (forced-colors: active) {
  .ecg-hero, .hero, .cp-hero { forced-color-adjust: none; }
  .ecg-pattern, .ecg-step, .ecg-firstpass, .ecg-redflags { border: 1.5px solid ButtonText; }
}
/* Ensure text remains readable when scaled to 140% */
.personal-plan textarea, #searchInput, .shift-topline select {
  max-width: 100%;
}

/* ── 14. Scrollbars + iOS momentum (accent-tinted) ── */
.results-pop, .side-list, .stage, .disclaimer-modal {
  scrollbar-width: thin;
  scrollbar-color: var(--hover-line) transparent;
}
.patient-filter { scrollbar-width: none; }
.patient-filter::-webkit-scrollbar { display: none; }

/* ── 15. Long medical terms: never break layout ── */
.cp-card h3, .dx-card h4, .ecg-pattern h4, .sec-head span, .shift-grid h2,
.cluster h4, .wu-col h4, .study-topic strong {
  overflow-wrap: break-word;
  word-break: break-word;
  -webkit-hyphens: auto;
  -ms-hyphens: auto;
  hyphens: auto;
}
.sec-body, .ecg-step-body, .case-prompt p, .case-answer p, .ov-s {
  overflow-wrap: break-word;
}

/* ── EM Pocket phone layout: a calmer, thumb-friendly reading surface ── */
@media (max-width: 600px) {
  :root { --touch-target: 46px; }

  .topbar {
    grid-template-columns: repeat(6, minmax(40px, 1fr));
    gap: 6px;
    padding: max(8px, env(safe-area-inset-top, 8px)) 12px 9px;
  }
  .burger, #homeBtn, #studyBtn, #shiftBtn, #ecgBtn, .tools-toggle {
    width: 100%;
    min-width: 0;
    height: 46px;
    min-height: 46px;
    border-radius: 12px;
  }
  .searchwrap {
    min-height: 48px;
    margin-top: 2px;
    padding: 7px 12px;
    border-radius: 14px;
  }
  #searchInput { font-size: 0.9rem; }
  .topbar-tools {
    gap: 10px;
    margin-top: 0;
    padding: 12px;
    border-radius: 14px;
  }
  .chips { gap: 6px; }
  .chip {
    min-height: 44px;
    padding-inline: 6px;
    font-size: 0.72rem;
  }
  .pref-tools {
    padding: 4px;
    border-radius: 12px;
    background: var(--bg);
  }
  .pref-btn { min-height: 42px; }

  .stage { padding: 18px 12px 30px; }
  .foot { padding: 18px 16px calc(20px + env(safe-area-inset-bottom, 0px)); }
  .hero, .cp-hero, .ecg-hero { border-radius: 16px; }
  .hero { padding: 20px 18px; margin-bottom: 14px; }
  .hero h1 { font-size: 1.55rem; line-height: 1.18; }
  .hero-badges { gap: 6px; margin-top: 14px; }
  .hbadge { padding: 5px 8px; font-size: 0.67rem; }
  .ecg-entry { margin-bottom: 14px; border-radius: 16px; }
  .study-dashboard { margin-bottom: 16px; padding: 16px; border-radius: 16px; }
  .patient-filter { margin-bottom: 16px; padding-bottom: 6px; }
  .home-group { margin-bottom: 24px; }
  .group-title { margin-bottom: 10px; }
  .cp-grid { gap: 10px; }
  .cp-card { min-height: 128px; padding: 16px 18px; border-radius: 16px; }
  .cp-card .cp-ico { font-size: 1.7rem; margin-bottom: 4px; }
  .cp-card h3 { font-size: 1rem; }
  .cp-card .cp-count { top: 12px; right: 12px; }
}

/* ══════════ v4.1 final cross-browser fallbacks (inset, sticky, gap) ══════════ */
.sidebar { top: 0; right: auto; bottom: 0; left: 0; }
.side-backdrop, .disclaimer-overlay { top: 0; right: 0; bottom: 0; left: 0; }
.topbar { top: 0; }
/* Ensure sticky works everywhere */
@supports not (position: sticky) {
  .topbar { position: relative; }
}
/* Flex gap fallback: add breathing room when gap unsupported (old Safari) */
@supports not (gap: 8px) {
  .topbar > * + * { margin-left: 10px; }
  .chips > * + *, .patient-filter > * + *, .study-stats > * + * { margin-left: 6px; }
}

/* ══════════ v4.2 ECG schematic figures — professional, theme-aware, print-safe ══════════ */
.ecg-fig {
  margin: 12px 0 14px;
  border: 1.5px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--card);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.ecg-media {
  background-color: var(--card);
  background-image:
    linear-gradient(to right, var(--line-subtle) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-subtle) 1px, transparent 1px),
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 8px 8px, 8px 8px, 40px 40px, 40px 40px;
  padding: 6px 6px 2px;
}
.ecg-svg-wrap { line-height: 0; }
.ecg-svg {
  display: block;
  width: 100%;
  height: auto;
  max-height: none;
}
/* Step 5 is a dense evidence map, not a short rhythm strip: never shrink its labels into illegibility. */
.ecg-fig[data-ecg-fig="ischemia-map"] .ecg-svg { max-height: 830px !important; }
.ecg-trace {
  fill: none;
  stroke: var(--ink);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.ecg-trace-wide { stroke-width: 2.2; }
.ecg-trace-faint { opacity: 0.45; }
.ecg-marker {
  stroke: var(--critical);
  stroke-width: 1.2;
  stroke-dasharray: 4 3;
  opacity: 0.9;
}
.ecg-label {
  font-family: inherit;
  font-size: 9px;
  font-size: calc(9px * var(--type-scale, 1));
  font-weight: 700;
  fill: var(--ink-soft);
}
.ecg-label-b { font-weight: 800; fill: var(--ink); font-size: 9.5px; }
.ecg-box { fill: var(--card); stroke: var(--line); stroke-width: 1; }
.ecg-fig figcaption {
  padding: 8px 12px;
  border-top: 1px solid var(--line-subtle);
  background: var(--bg);
  color: var(--ink-soft);
  font-size: 0.76rem;
  line-height: 1.45;
}
.ecg-schem {
  display: inline-block;
  font-size: 0.62rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 2px 8px;
  margin-right: 6px;
  border-radius: var(--radius-full);
  background: var(--accent-light);
  border: 1px solid var(--ov-job-line);
  color: var(--brand-2);
  vertical-align: 1px;
}
html[data-theme="dark"] .ecg-schem { color: var(--accent); }
.ecg-img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 6px;
  background: #fff;
}
@media (max-width: 480px) {
  .ecg-media { padding: 4px 4px 0; }
  .ecg-svg { max-height: 180px; }
  .ecg-fig figcaption { font-size: 0.72rem; padding: 7px 10px; }
}
@media print {
  .ecg-fig { box-shadow: none; break-inside: avoid; border-color: #bbb; }
  .ecg-media { background: #fff !important; }
  .ecg-trace { stroke: #111 !important; }
  .ecg-label { fill: #444 !important; }
  .ecg-label-b { fill: #111 !important; }
  .ecg-marker { stroke: #b91c1c !important; }
  .ecg-box { fill: #fff !important; stroke: #bbb !important; }
  .ecg-fig figcaption { background: #f6f6f6 !important; color: #333 !important; }
}
@media (forced-colors: active) {
  .ecg-trace { stroke: ButtonText; }
  .ecg-label, .ecg-label-b { fill: ButtonText; }
  .ecg-marker { stroke: Highlight; }
  .ecg-box { fill: Canvas; stroke: ButtonText; }
  .ecg-fig { border: 1.5px solid ButtonText; }
}

/* v4.3 ECG accuracy helpers */
.ecg-lead { font-weight: 800; fill: var(--ink); font-size: 10px; font-size: calc(10px * var(--type-scale, 1)); }
.ecg-j { fill: var(--critical); stroke: #fff; stroke-width: 0.8; }
html[data-theme="dark"] .ecg-j { stroke: #05241a; }
@media print { .ecg-j { fill: #b91c1c !important; stroke: #fff !important; } }
@media (forced-colors: active) { .ecg-j { fill: Highlight; stroke: Canvas; } }

/* v4.4 ECG clarity + modern + interactive (LITFL-inspired, original art) */
.ecg-trace { stroke-width: 2.4; }
.ecg-trace-wide { stroke-width: 2.6; }
.ecg-marker { stroke-width: 1.4; }
.ecg-j { r: 2.6; }
.ecg-svg text, .ecg-label {
  paint-order: stroke;
  stroke: var(--card);
  stroke-width: 3px;
  stroke-linejoin: round;
}
.ecg-media { padding: 8px 8px 4px; }
.ecg-fig { transition: box-shadow 220ms ease, border-color 220ms ease, transform 220ms ease; }
@media (hover: hover) and (pointer: fine) {
  .ecg-fig:hover { border-color: var(--accent); box-shadow: var(--shadow); }
}
/* Toolbar */
.ecg-tools {
  display: flex; flex-wrap: wrap; gap: 8px;
  padding: 8px 12px;
  border-top: 1px solid var(--line-subtle);
  background: var(--card);
  align-items: center;
}
.ecg-tool {
  min-height: 40px;
  padding: 6px 14px;
  border: 1.5px solid var(--line);
  border-radius: var(--radius-full);
  background: var(--bg);
  color: var(--ink);
  font: inherit; font-size: 0.76rem; font-weight: 800;
  cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-sm);
  transition: all 150ms ease;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.ecg-tool:hover { border-color: var(--accent); background: var(--home-hover); transform: translateY(-1px); }
.ecg-tool:active { transform: scale(0.97); }
.ecg-tool[aria-pressed="true"] { background: var(--brand-2); border-color: var(--brand-2); color: #fff; }
html[data-theme="dark"] .ecg-tool[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--on-fill); }
/* Annotation toggle */
.ecg-fig.hide-anno .ecg-marker,
.ecg-fig.hide-anno circle.ecg-j,
.ecg-fig.hide-anno .ecg-sthl,
.ecg-fig.hide-anno text.ecg-label:not(.ecg-lead) { display: none; }
/* Normal-reference inset (hidden until toggled) */
.ecg-normal-ref { display: none; }
.ecg-fig.show-compare .ecg-normal-ref { display: block; }
.ecg-normal-trace { fill: none; stroke: var(--common); stroke-width: 1.6; stroke-dasharray: 5 3; stroke-linecap: round; }
.ecg-normal-box { fill: var(--card); stroke: var(--common); stroke-width: 1; opacity: 0.96; }
.ecg-credit { display: block; margin-top: 4px; font-size: 0.7rem; opacity: 0.9; }
.ecg-litfl { margin-top: 10px; font-size: 0.78rem; color: var(--ink-soft); line-height: 1.5; }
.ecg-litfl a { color: var(--brand-2); font-weight: 800; }
/* Lightbox (enlarge) */
.ecg-lightbox {
  position: fixed; top: 0; right: 0; bottom: 0; left: 0;
  z-index: 500;
  background: rgba(4,14,10,0.78);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  display: grid; place-items: center;
  padding: 20px;
  overflow-y: auto;
}
.ecg-lightbox[hidden] { display: none !important; }
.ecg-lightbox-card {
  width: 100%; max-width: 760px;
  background: var(--card); color: var(--ink);
  border: 1.5px solid var(--line); border-radius: var(--radius-xl);
  box-shadow: var(--shadow-float);
  overflow: hidden;
}
.ecg-lightbox-head {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 16px; border-bottom: 1px solid var(--line);
}
.ecg-lightbox-head strong { font-size: 0.95rem; }
.ecg-lightbox-close {
  min-height: 44px; padding: 8px 18px;
  border-radius: var(--radius-md); border: 1.5px solid var(--line);
  background: var(--bg); color: var(--ink);
  font: inherit; font-size: 0.82rem; font-weight: 800; cursor: pointer;
}
.ecg-lightbox-close:hover { border-color: var(--accent); }
.ecg-lightbox-media {
  background-color: var(--card);
  background-image:
    linear-gradient(to right, var(--line-subtle) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-subtle) 1px, transparent 1px),
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 8px 8px, 8px 8px, 40px 40px, 40px 40px;
  padding: 10px;
}
.ecg-lightbox-media .ecg-svg { max-height: none; }
.ecg-lightbox-cap { padding: 10px 16px 16px; color: var(--ink-soft); font-size: 0.82rem; line-height: 1.5; }
@media (max-width: 480px) {
  .ecg-tool { flex: 1; justify-content: center; }
  .ecg-lightbox { padding: 12px; }
}
@media print {
  .ecg-fig[data-sel] .ecg-marker, .ecg-fig[data-sel] text.ecg-label[data-wave], .ecg-fig[data-sel] circle.ecg-j { opacity: 1 !important; }
  .ecg-tools, .ecg-lightbox { display: none !important; }
  .ecg-fig.hide-anno .ecg-marker,
  .ecg-fig.hide-anno circle.ecg-j,
  .ecg-fig.hide-anno .ecg-sthl,
  .ecg-fig.hide-anno text.ecg-label:not(.ecg-lead) { display: block !important; }
  .ecg-normal-ref { display: none !important; }
}
@media (forced-colors: active) {
  .ecg-tool, .ecg-lightbox-card { border: 1.5px solid ButtonText; }
  .ecg-normal-trace { stroke: Highlight; }
  .ecg-normal-box { stroke: Highlight; fill: Canvas; }
}
@media (prefers-reduced-motion: reduce) {
  .ecg-fig, .ecg-tool { transition: none !important; }
}

/* v4.5 ECG paper — classic high-contrast printout, always light for realism */
.ecg-media {
  background-color: #ffffff;
  background-image:
    linear-gradient(to right, rgba(244,120,130,0.22) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(244,120,130,0.22) 1px, transparent 1px),
    linear-gradient(to right, rgba(230,80,95,0.42) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(230,80,95,0.42) 1px, transparent 1px);
  background-size: 8px 8px, 8px 8px, 40px 40px, 40px 40px;
  border-bottom: 1px solid #f0b6bc;
}
.ecg-svg.ecg-paper { max-height: 340px; }
.ecg-svg.ecg-tall { max-height: 460px; }
.ecg-svg.ecg-case-12lead { max-height: 320px; }
/* Keep the conventional 3 × 4 + rhythm-strip layout readable on a phone. */
@media (max-width: 700px) { .ecg-svg.ecg-case-12lead { max-height: 260px; } }
@media (max-width: 700px) { .ecg-svg.ecg-tall { max-height: 300px; } }
/* Phones: let wide ECG figures pan horizontally instead of shrinking to
   unreadable size. min-width keeps annotation text near 9px at 360px. */
@media (max-width: 700px) {
  .ecg-media { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .ecg-media .ecg-svg-wrap { min-width: 0; }
  .ecg-media .ecg-svg-wrap .ecg-svg { max-height: none; }
}
.ecg-paper .ecg-trace { stroke: #111111; }
.ecg-paper .ecg-rhythm { stroke-width: 2; opacity: 0.95; }
.ecg-paper .ecg-label { fill: #374151; stroke: #ffffff; }
.ecg-paper .ecg-lead { fill: #111111; }
.ecg-paper .ecg-marker { stroke: #dc2626; }
.ecg-paper .ecg-j { fill: #dc2626; stroke: #ffffff; }
.ecg-paper .ecg-box { fill: #ffffff; stroke: #d1d5db; }
.ecg-paper .ecg-sep { stroke: #e5a0a7; stroke-width: 1; stroke-dasharray: 6 4; }
.ecg-paper .ecg-normal-trace { stroke: #16a34a; }
.ecg-paper .ecg-normal-box { fill: #ffffff; stroke: #16a34a; }
.ecg-lightbox-media {
  background-color: #ffffff;
  background-image:
    linear-gradient(to right, rgba(244,120,130,0.22) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(244,120,130,0.22) 1px, transparent 1px),
    linear-gradient(to right, rgba(230,80,95,0.42) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(230,80,95,0.42) 1px, transparent 1px);
  background-size: 8px 8px, 8px 8px, 40px 40px, 40px 40px;
}
@media (max-width: 700px) {
  .ecg-svg.ecg-paper { max-height: 240px; }
}

/* v4.6 pilot: tappable R-peak calipers (Step 1) */
.ecg-hit { fill: transparent; stroke: none; pointer-events: all; cursor: pointer; outline: none; }
.ecg-hit:hover { fill: rgba(var(--accent-rgb),0.28); stroke: var(--accent); stroke-width: 2; }
.ecg-hit:focus, .ecg-hit:focus-visible { fill: rgba(var(--accent-rgb),0.32); stroke: var(--accent); stroke-width: 2.5; outline: none; }
@media (forced-colors: active) { .ecg-hit:hover, .ecg-hit:focus { fill: Highlight; stroke: HighlightText; } }
.ecg-sec { fill: var(--ink-soft); }
.ecg-paper .ecg-sec { fill: #9ca3af; }

/* v4.7 wave inspector (Step 1 pilot) */
.ecg-hotzone { fill: transparent; stroke: none; pointer-events: all; }
.ecg-hot { cursor: pointer; outline: none; }
/* Hit areas remain interactive but never paint a second selection outline.
   Hover/focus/click all drive the single SVG finding ellipse. */
.ecg-hot:is(:hover, :focus, :focus-visible, .on) .ecg-hotzone,
.ecg-paper .ecg-hot:is(:hover, :focus, :focus-visible, .on) .ecg-hotzone { fill: transparent; stroke: none; }
.ecg-inspector {
  padding: 9px 14px;
  border-top: 1px solid var(--line-subtle);
  background: var(--bg);
  color: var(--ink);
  font-size: 0.8rem;
  line-height: 1.5;
  min-height: 48px;
}
.ecg-inspector strong { color: var(--brand-2); }
html[data-theme="dark"] .ecg-inspector strong { color: var(--accent); }
@media print { .ecg-inspector { display: none !important; } .ecg-hotzone { display: none !important; } }

.ecg-legend-ring { fill: none; stroke: var(--accent); stroke-width: 2; }
.ecg-paper .ecg-legend-ring { stroke: #059669; }
.ecg-lightbox .ecg-hotzone { pointer-events: none; }
.ecg-lightbox .ecg-hot { cursor: default; }
/* v4.8 linked annotations: tapped wave keeps its red lines, others dim */
.ecg-fig .ecg-marker, .ecg-fig text.ecg-label[data-wave] { transition: opacity 150ms ease; }
.ecg-fig[data-sel="cal"] .ecg-marker:not([data-wave="cal"]) { opacity: 0.12; }
.ecg-fig[data-sel="cal"] text.ecg-label[data-wave]:not([data-wave="cal"]) { opacity: 0.12; }
.ecg-fig[data-sel="cal"] circle.ecg-j:not([data-wave="cal"]) { opacity: 0.12; }
.ecg-fig[data-sel="p"] .ecg-marker:not([data-wave="p"]) { opacity: 0.12; }
.ecg-fig[data-sel="p"] text.ecg-label[data-wave]:not([data-wave="p"]) { opacity: 0.12; }
.ecg-fig[data-sel="p"] circle.ecg-j:not([data-wave="p"]) { opacity: 0.12; }
.ecg-fig[data-sel="pr"] .ecg-marker:not([data-wave="pr"]) { opacity: 0.12; }
.ecg-fig[data-sel="pr"] text.ecg-label[data-wave]:not([data-wave="pr"]) { opacity: 0.12; }
.ecg-fig[data-sel="pr"] circle.ecg-j:not([data-wave="pr"]) { opacity: 0.12; }
.ecg-fig[data-sel="qrs"] .ecg-marker:not([data-wave="qrs"]) { opacity: 0.12; }
.ecg-fig[data-sel="qrs"] text.ecg-label[data-wave]:not([data-wave="qrs"]) { opacity: 0.12; }
.ecg-fig[data-sel="qrs"] circle.ecg-j:not([data-wave="qrs"]) { opacity: 0.12; }
.ecg-fig[data-sel="st"] .ecg-marker:not([data-wave="st"]) { opacity: 0.12; }
.ecg-fig[data-sel="st"] text.ecg-label[data-wave]:not([data-wave="st"]) { opacity: 0.12; }
.ecg-fig[data-sel="st"] circle.ecg-j:not([data-wave="st"]) { opacity: 0.12; }
.ecg-fig[data-sel="t"] .ecg-marker:not([data-wave="t"]) { opacity: 0.12; }
.ecg-fig[data-sel="t"] text.ecg-label[data-wave]:not([data-wave="t"]) { opacity: 0.12; }
.ecg-fig[data-sel="t"] circle.ecg-j:not([data-wave="t"]) { opacity: 0.12; }
.ecg-fig[data-sel="qt"] .ecg-marker:not([data-wave="qt"]) { opacity: 0.12; }
.ecg-fig[data-sel="qt"] text.ecg-label[data-wave]:not([data-wave="qt"]) { opacity: 0.12; }
.ecg-fig[data-sel="qt"] circle.ecg-j:not([data-wave="qt"]) { opacity: 0.12; }
.ecg-fig[data-sel="rr"] .ecg-marker:not([data-wave="rr"]) { opacity: 0.12; }
.ecg-fig[data-sel="rr"] text.ecg-label[data-wave]:not([data-wave="rr"]) { opacity: 0.12; }
.ecg-fig[data-sel="rr"] circle.ecg-j:not([data-wave="rr"]) { opacity: 0.12; }
.ecg-fig[data-sel="inf"] .ecg-marker:not([data-wave="inf"]) { opacity: 0.12; }
.ecg-fig[data-sel="inf"] text.ecg-label[data-wave]:not([data-wave="inf"]) { opacity: 0.12; }
.ecg-fig[data-sel="inf"] circle.ecg-j:not([data-wave="inf"]) { opacity: 0.12; }
.ecg-fig[data-sel="mirror"] .ecg-marker:not([data-wave="mirror"]) { opacity: 0.12; }
.ecg-fig[data-sel="mirror"] text.ecg-label[data-wave]:not([data-wave="mirror"]) { opacity: 0.12; }
.ecg-fig[data-sel="mirror"] circle.ecg-j:not([data-wave="mirror"]) { opacity: 0.12; }
.ecg-fig[data-sel="hyperacute"] .ecg-marker:not([data-wave="hyperacute"]) { opacity: 0.12; }
.ecg-fig[data-sel="hyperacute"] text.ecg-label[data-wave]:not([data-wave="hyperacute"]) { opacity: 0.12; }
.ecg-fig[data-sel="hyperacute"] circle.ecg-j:not([data-wave="hyperacute"]) { opacity: 0.12; }
.ecg-fig[data-sel="hyperk"] .ecg-marker:not([data-wave="hyperk"]) { opacity: 0.12; }
.ecg-fig[data-sel="hyperk"] text.ecg-label[data-wave]:not([data-wave="hyperk"]) { opacity: 0.12; }
.ecg-fig[data-sel="hyperk"] circle.ecg-j:not([data-wave="hyperk"]) { opacity: 0.12; }
.ecg-fig[data-sel="ischa"] .ecg-marker:not([data-wave="ischa"]) { opacity: 0.12; }
.ecg-fig[data-sel="ischa"] text.ecg-label[data-wave]:not([data-wave="ischa"]) { opacity: 0.12; }
.ecg-fig[data-sel="ischa"] circle.ecg-j:not([data-wave="ischa"]) { opacity: 0.12; }
.ecg-fig[data-sel="wellens"] .ecg-marker:not([data-wave="wellens"]) { opacity: 0.12; }
.ecg-fig[data-sel="wellens"] text.ecg-label[data-wave]:not([data-wave="wellens"]) { opacity: 0.12; }
.ecg-fig[data-sel="wellens"] circle.ecg-j:not([data-wave="wellens"]) { opacity: 0.12; }
.ecg-fig[data-sel="dewinter"] .ecg-marker:not([data-wave="dewinter"]) { opacity: 0.12; }
.ecg-fig[data-sel="dewinter"] text.ecg-label[data-wave]:not([data-wave="dewinter"]) { opacity: 0.12; }
.ecg-fig[data-sel="dewinter"] circle.ecg-j:not([data-wave="dewinter"]) { opacity: 0.12; }
.ecg-fig[data-sel="sgSte"] .ecg-marker:not([data-wave="sgSte"]) { opacity: 0.12; }
.ecg-fig[data-sel="sgSte"] text.ecg-label[data-wave]:not([data-wave="sgSte"]) { opacity: 0.12; }
.ecg-fig[data-sel="sgSte"] circle.ecg-j:not([data-wave="sgSte"]) { opacity: 0.12; }
.ecg-fig[data-sel="sgStd"] .ecg-marker:not([data-wave="sgStd"]) { opacity: 0.12; }
.ecg-fig[data-sel="sgStd"] text.ecg-label[data-wave]:not([data-wave="sgStd"]) { opacity: 0.12; }
.ecg-fig[data-sel="sgStd"] circle.ecg-j:not([data-wave="sgStd"]) { opacity: 0.12; }
.ecg-fig[data-sel="sgDis"] .ecg-marker:not([data-wave="sgDis"]) { opacity: 0.12; }
.ecg-fig[data-sel="sgDis"] text.ecg-label[data-wave]:not([data-wave="sgDis"]) { opacity: 0.12; }
.ecg-fig[data-sel="sgDis"] circle.ecg-j:not([data-wave="sgDis"]) { opacity: 0.12; }
.ecg-fig[data-sel="ant"] .ecg-marker:not([data-wave="ant"]) { opacity: 0.12; }
.ecg-fig[data-sel="ant"] text.ecg-label[data-wave]:not([data-wave="ant"]) { opacity: 0.12; }
.ecg-fig[data-sel="ant"] circle.ecg-j:not([data-wave="ant"]) { opacity: 0.12; }
.ecg-fig[data-sel="post"] .ecg-marker:not([data-wave="post"]) { opacity: 0.12; }
.ecg-fig[data-sel="post"] text.ecg-label[data-wave]:not([data-wave="post"]) { opacity: 0.12; }
.ecg-fig[data-sel="post"] circle.ecg-j:not([data-wave="post"]) { opacity: 0.12; }
.ecg-fig[data-sel="narrow"] .ecg-marker:not([data-wave="narrow"]) { opacity: 0.12; }
.ecg-fig[data-sel="narrow"] text.ecg-label[data-wave]:not([data-wave="narrow"]) { opacity: 0.12; }
.ecg-fig[data-sel="narrow"] circle.ecg-j:not([data-wave="narrow"]) { opacity: 0.12; }
.ecg-fig[data-sel="wide"] .ecg-marker:not([data-wave="wide"]) { opacity: 0.12; }
.ecg-fig[data-sel="wide"] text.ecg-label[data-wave]:not([data-wave="wide"]) { opacity: 0.12; }
.ecg-fig[data-sel="wide"] circle.ecg-j:not([data-wave="wide"]) { opacity: 0.12; }
.ecg-fig[data-sel="psinus"] .ecg-marker:not([data-wave="psinus"]) { opacity: 0.12; }
.ecg-fig[data-sel="psinus"] text.ecg-label[data-wave]:not([data-wave="psinus"]) { opacity: 0.12; }
.ecg-fig[data-sel="psinus"] circle.ecg-j:not([data-wave="psinus"]) { opacity: 0.12; }
.ecg-fig[data-sel="axis"] .ecg-marker:not([data-wave="axis"]) { opacity: 0.12; }
.ecg-fig[data-sel="axis"] text.ecg-label[data-wave]:not([data-wave="axis"]) { opacity: 0.12; }
.ecg-fig[data-sel="axis"] circle.ecg-j:not([data-wave="axis"]) { opacity: 0.12; }
.ecg-fig[data-sel="reg"] .ecg-marker:not([data-wave="reg"]) { opacity: 0.12; }
.ecg-fig[data-sel="reg"] text.ecg-label[data-wave]:not([data-wave="reg"]) { opacity: 0.12; }
.ecg-fig[data-sel="reg"] circle.ecg-j:not([data-wave="reg"]) { opacity: 0.12; }
.ecg-fig[data-sel="v1"] .ecg-marker:not([data-wave="v1"]) { opacity: 0.12; }
.ecg-fig[data-sel="v1"] text.ecg-label[data-wave]:not([data-wave="v1"]) { opacity: 0.12; }
.ecg-fig[data-sel="v1"] circle.ecg-j:not([data-wave="v1"]) { opacity: 0.12; }
.ecg-fig[data-sel="v5"] .ecg-marker:not([data-wave="v5"]) { opacity: 0.12; }
.ecg-fig[data-sel="v5"] text.ecg-label[data-wave]:not([data-wave="v5"]) { opacity: 0.12; }
.ecg-fig[data-sel="v5"] circle.ecg-j:not([data-wave="v5"]) { opacity: 0.12; }
.ecg-fig[data-sel="chambers"] .ecg-marker:not([data-wave="chambers"]) { opacity: 0.12; }
.ecg-fig[data-sel="chambers"] text.ecg-label[data-wave]:not([data-wave="chambers"]) { opacity: 0.12; }
.ecg-fig[data-sel="chambers"] circle.ecg-j:not([data-wave="chambers"]) { opacity: 0.12; }
.ecg-fig[data-sel="lowv"] .ecg-marker:not([data-wave="lowv"]) { opacity: 0.12; }
.ecg-fig[data-sel="lowv"] text.ecg-label[data-wave]:not([data-wave="lowv"]) { opacity: 0.12; }
.ecg-fig[data-sel="lowv"] circle.ecg-j:not([data-wave="lowv"]) { opacity: 0.12; }
.ecg-fig[data-sel] .ecg-marker[data-wave] { stroke-width: 2.2; }
@media (prefers-reduced-motion: reduce) { .ecg-fig .ecg-marker, .ecg-fig text.ecg-label[data-wave], .ecg-fig circle.ecg-j { transition: none !important; } }
/* v4.9 wave buttons below ECG */
.ecg-wavebtns { display: flex; flex-wrap: wrap; gap: 8px; padding: 10px 12px; border-top: 1px solid var(--line-subtle); background: var(--card); }
.ecg-wavebtn { min-height: 40px; padding: 6px 14px; border: 1.5px solid var(--line); border-radius: var(--radius-full); background: var(--bg); color: var(--ink); font: inherit; font-size: 0.76rem; font-weight: 800; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; box-shadow: var(--shadow-sm); transition: all 150ms ease; -webkit-tap-highlight-color: transparent; touch-action: manipulation; }
.ecg-wavebtn:hover { border-color: var(--accent); background: var(--home-hover); transform: translateY(-1px); }
.ecg-wavebtn:active { transform: scale(0.97); }
.ecg-wavebtn[aria-pressed="true"] { background: var(--brand-2); border-color: var(--brand-2); color: #fff; }
html[data-theme="dark"] .ecg-wavebtn[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--on-fill); }
@media (max-width: 480px) { .ecg-wavebtn { flex: 1 1 30%; padding: 6px 8px; } }
@media print { .ecg-wavebtns { display: none !important; } }
@media (forced-colors: active) { .ecg-wavebtn { border: 1.5px solid ButtonText; } }
@media (prefers-reduced-motion: reduce) { .ecg-wavebtn { transition: none !important; } }
.ecg-axis-ok { fill: rgba(var(--accent-rgb),0.14); stroke: none; }
.ecg-axis-line { stroke: var(--ink); stroke-width: 1.5; }
.ecg-paper .ecg-axis-ok { fill: rgba(22,163,74,0.12); }
@media print { .ecg-axis-ok { fill: #e6f7f2 !important; } .ecg-axis-line { stroke: #111 !important; } }
@media (forced-colors: active) { .ecg-axis-ok { fill: Canvas; stroke: ButtonText; } .ecg-axis-line { stroke: ButtonText; } }
/* v4.11 night-mode: paper stays light, so no theme-ink paint inside it */
.ecg-paper .ecg-label-b { fill: #111111; stroke: #ffffff; }
.ecg-paper .ecg-axis-line { stroke: #111111; }
/* v4.12 label readability: halo blobs on scaled SVG in Chromium — use bare dark glyphs like real printouts */
.ecg-svg text, .ecg-svg .ecg-label, .ecg-svg .ecg-lead, .ecg-svg .ecg-label-b {
  paint-order: normal;
  stroke: none;
}
.ecg-paper .ecg-label { fill: #1f2937; }
.ecg-paper .ecg-lead, .ecg-paper .ecg-label-b { fill: #111111; }
.ecg-svg .ecg-label { font-size: 10.5px; font-size: calc(10.5px * var(--type-scale, 1)); }
.ecg-svg .ecg-lead, .ecg-svg .ecg-label-b { font-size: 12px; font-size: calc(12px * var(--type-scale, 1)); }
@media print {
  .ecg-paper .ecg-label { fill: #1f2937 !important; }
  .ecg-paper .ecg-lead, .ecg-paper .ecg-label-b { fill: #111111 !important; }
}
@media (forced-colors: active) {
  .ecg-svg text { stroke: none; }
}

/* ── Small-screen containment: keep every app surface inside the viewport ── */
@media (max-width: 600px) {
  html, body, .main, .topbar, .stage, .stage > *, .foot {
    width: 100%;
    max-width: 100%;
    min-width: 0;
  }
  .main { margin-left: 0; }
  .sidebar {
    width: min(88vw, 320px);
    max-width: calc(100vw - env(safe-area-inset-right, 0px));
    padding: max(14px, env(safe-area-inset-top, 14px)) 12px calc(14px + env(safe-area-inset-bottom, 0px));
  }
  .side-list, .side-footer, .brand-text, .side-item, .side-btn { min-width: 0; }
  .side-item, .side-btn { overflow-wrap: anywhere; }

  .topbar > * { min-width: 0; }
  .topbar-tools, .chips, .pref-tools { max-width: 100%; min-width: 0; }
  .topbar-tools.open { overflow: hidden; }
  .pref-tools { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .pref-btn, .pref-scale { min-width: 0; }
  .section-card, .sec-head, .sec-body, .cp-hero, .hero, .ecg-hero,
  .study-dashboard, .personal-plan, .shift-sheet, .shift-topline,
  .ecg-pattern, .ecg-fig, .ecg-media { min-width: 0; max-width: 100%; }
}

@media (max-width: 360px) {
  .topbar {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 5px;
    padding-inline: 8px;
  }
  .burger, #homeBtn, #studyBtn, #shiftBtn, #ecgBtn, .tools-toggle {
    min-width: 0;
    width: 100%;
    height: 44px;
    min-height: 44px;
  }
  .tools-toggle .header-label { display: none; }
  .sidebar { width: min(92vw, 300px); }
  .stage { padding-inline: 10px; }
  .hero, .cp-hero, .ecg-hero { padding-left: 16px; padding-right: 16px; }
  .chip { font-size: 0.68rem; }
}

/* v5.0 ECG engine 12-lead (Phase 1): paper grid lives inside the SVG so paper
   and waveform stay geometrically locked. Container only provides readable
   horizontal scroll on phones; engine SVG is self-styled (always light paper)
   and needs no theme overrides. */
.ecg-svg.ecg-engine-12lead { max-height: 560px; }
.ecg-fig .ecg-svg.ecg-engine-12lead { width: 100%; height: auto; }
@media (max-width: 700px) {
  .ecg-media .ecg-svg-wrap:has(.ecg-engine-12lead) { min-width: 0; }
  .ecg-svg.ecg-engine-12lead { max-height: none; min-width: 0; }
}
@media print {
  .ecg-svg.ecg-engine-12lead { max-height: none; }
}

/* ECG audit: paper and signal share SVG units. Schematics have no pseudo-scale. */
.ecg-media, .ecg-lightbox-media { background: #fff; }
.ecg-fig .ecg-svg.ecg-calibrated { max-height: none; }
.ecg-fig:has(.ecg-calibrated) .ecg-svg-wrap { min-width: 0; }
.ecg-fig:has(.ecg-calibrated) .ecg-media { overflow-x: auto; }
.ecg-calibrated .ecg-panel-heading { font: 600 13px ui-monospace, SFMono-Regular, Consolas, monospace; fill: #17212b; }
.ecg-calibrated .ecg-panel-tick { font: 11px ui-monospace, SFMono-Regular, Consolas, monospace; fill: #475569; }
.ecg-calibrated .ecg-signal { stroke: #17212b; stroke-width: 1.25; }
.ecg-reference { display: none; fill: none; stroke: #2563eb; stroke-width: 1.25; stroke-dasharray: 5 3; }
.show-reference .ecg-reference { display: block; }
.hide-anno .ecg-annotation, .hide-labels .ecg-annotation,
.hide-labels .ecg-marker, .hide-labels .ecg-label:not(.ecg-lead) { display: none; }
.ecg-workbench .ecg-lightbox-card { max-width: 1200px; max-height: calc(100dvh - 32px); overflow-y: auto; }
.ecg-workbench .ecg-lightbox-head { position: sticky; top: 0; z-index: 2; background: var(--card); }
.ecg-workbench-tools, .ecg-caliper-inputs { display: flex; flex-wrap: wrap; align-items: end; gap: 10px; padding: 12px 16px; border-bottom: 1px solid var(--line); }
.ecg-workbench-tools label, .ecg-caliper-inputs label { display: grid; gap: 4px; font-size: .75rem; color: var(--ink-soft); }
.ecg-workbench-tools select, .ecg-workbench-tools button, .ecg-caliper-inputs input { min-height: 44px; border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; background: var(--card); color: var(--ink); font: inherit; }
.ecg-caliper-inputs input { width: 140px; }
.ecg-workbench-tools button { cursor: pointer; font-size: .8rem; }
.ecg-workbench-tools button[aria-pressed="true"] { background: var(--accent); color: #10261c; }
.ecg-workbench-tools :focus-visible, .ecg-caliper-inputs :focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.ecg-workbench-paper { max-height: 58dvh; overflow: auto; background: white; padding: 12px; }
.ecg-workbench-canvas { min-width: 0; }
.ecg-workbench-canvas .ecg-svg { max-height: none !important; width: 100%; height: auto; }
.ecg-workbench-canvas.is-measuring { cursor: crosshair; touch-action: none; }
.ecg-workbench .ecg-hotzone { pointer-events: none; }
.ecg-calipers line { stroke: #7c3aed; stroke-width: 1; stroke-dasharray: 3 2; }
.ecg-calipers circle { fill: #7c3aed; stroke: white; stroke-width: 2; cursor: grab; }
.ecg-calipers text { fill: #5b21b6; font: bold 14px system-ui, sans-serif; paint-order: stroke; stroke: white; stroke-width: 3; }
.ecg-measurement { margin: 0; padding: 10px 16px; font-size: .85rem; line-height: 1.5; }
.ecg-measurement:empty { display: none; }
.ecg-caliper-inputs[hidden] { display: none; }
.ecg-fig figcaption { line-height: 1.55; }
@media (max-width: 600px) {
  .ecg-workbench { padding: 4px; }
  .ecg-workbench .ecg-lightbox-card { max-height: calc(100dvh - 8px); }
  .ecg-workbench-tools { gap: 6px; padding: 10px; }
  .ecg-workbench-paper { max-height: 48dvh; }
}
@media print {
  .ecg-fig:has(.ecg-calibrated) .ecg-svg-wrap { min-width: 0; }
  .ecg-fig:has(.ecg-calibrated) .ecg-media { overflow: visible; }
  .ecg-annotation { display: block !important; }
  .ecg-reference { display: none !important; }
  .ecg-workbench { display: none !important; }
}
.ecg-tool[hidden] { display: none !important; }

/* Fit the whole tracing first; zoom is an explicit viewer action. */
.ecg-fig .ecg-media { overflow: hidden; padding: 6px; }
.ecg-fig .ecg-svg-wrap { width: 100%; min-width: 0; max-width: 720px; margin-inline: auto; }
.ecg-fig .ecg-media .ecg-svg { width: 100%; min-width: 0; height: auto; max-height: none !important; }
.ecg-workbench .ecg-lightbox-card { min-width: 0; }
.ecg-workbench-canvas .ecg-svg { min-width: 0; }
.ecg-workbench-tools label { min-width: 0; }
.ecg-workbench-tools select { width: 100%; min-width: 0; max-width: 100%; }
.ecg-workbench-tools .ecg-diagnosis { flex: 1 1 100%; grid-column: 1 / -1; font-size: .85rem; }
.ecg-findings { padding: 12px 16px; border-bottom: 1px solid var(--line); }
.ecg-findings > strong { font-size: .85rem; }
.ecg-finding-buttons { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.ecg-finding-buttons button { min-height: 44px; padding: 8px 12px; border: 1px solid var(--line); border-radius: 8px; color: var(--ink); background: var(--card); font: inherit; font-size: .8rem; cursor: pointer; }
.ecg-finding-buttons button[aria-pressed="true"] { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.ecg-finding-detail { margin: 10px 0 0; font-size: .85rem; line-height: 1.55; }
.ecg-finding-marks, .ecg-inline-marks { pointer-events: none; }
.ecg-finding-marks ellipse, .ecg-inline-marks { fill: rgba(220,38,38,.035); stroke: #dc2626; stroke-width: 2.5; vector-effect: non-scaling-stroke; }
.ecg-guided-target { fill: transparent; stroke: none; cursor: pointer; pointer-events: all; }
.ecg-guided-target:focus-visible { outline: none; stroke: none; }
@media (forced-colors: active) { .ecg-finding-marks ellipse, .ecg-inline-marks { stroke: Highlight; fill: none; forced-color-adjust: none; } }
.ecg-settings { border-bottom: 1px solid var(--line); }
.ecg-settings summary { min-height: 44px; padding: 12px 16px; font-size: .8rem; cursor: pointer; }
.ecg-calipers .ecg-caliper-hit { fill: transparent; stroke: none; }
.ecg-calibrated .ecg-panel-heading { font-size: 20px; }
.ecg-calibrated .ecg-panel-tick { font-size: 17px; }
.ecg-panel-select { display: grid; grid-template-columns: auto minmax(0, 1fr); align-items: center; gap: 10px; padding: 8px; font-size: .85rem; }
.ecg-panel-select select { min-width: 0; width: 100%; min-height: 44px; border: 1px solid var(--line); border-radius: 8px; padding: 6px; color: var(--ink); background: var(--card); font: inherit; }
.ecg-fig .ecg-svg { overflow: hidden; }
.ecg-fig[data-ecg-fig="normal-12lead"] .ecg-media { overflow-x: auto; }
.ecg-fig[data-ecg-fig="normal-12lead"] .ecg-svg-wrap { min-width: 920px; max-width: none; }
.ecg-workbench-paper:has(.ecg-engine-12lead) .ecg-workbench-canvas { min-width: 920px; }
.ecg-workbench-paper { max-height: none; overflow-x: auto; overflow-y: hidden; }
.ecg-workbench .ecg-lightbox-close, .ecg-tool, .ecg-wavebtn, .ecg-step-chip { min-height: 44px; }
@media print {
  .ecg-panel-select { display: none; }
  .ecg-fig[data-ecg-fig="normal-12lead"] .ecg-svg-wrap { min-width: 0; }
}
@media (max-width: 700px) {
  .case-actions:has(#openDynamicEcg) { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .case-actions:has(#openDynamicEcg) .case-action { min-width: 0; min-height: 44px; white-space: normal; }
  .ecg-pattern-grid { grid-template-columns: minmax(0, 1fr); }
  .ecg-pattern { padding: 12px; }
  .ecg-fig { margin-block: 10px; }
  .ecg-fig .ecg-media { padding: 4px; }
  .ecg-workbench-tools { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); align-items: stretch; }
  .ecg-workbench-tools button, .ecg-workbench-tools select { padding: 7px; font-size: .72rem; }
  .ecg-workbench-paper { padding: 6px; }
  .ecg-caliper-inputs { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); padding: 10px; }
  .ecg-caliper-inputs input { width: 100%; min-width: 0; }
}

/* Student interface: neutral reading surfaces and one consistent navigation hierarchy. */
html[data-theme][data-accent] {
  --bg: #f6f7f9; --card: #fff; --card-elevated: #fff;
  --ink: #202b38; --ink-soft: #647181; --line: #dfe4e9; --line-subtle: #edf0f3;
  --topbar-bg: #fff; --foot-bg: #f6f7f9; --home-hover: #f0f4f4; --hover-line: #bdcbc9;
  --ov-job-bg: #f2f6f5; --ov-job-line: #dbe6e2;
  --shadow-sm: 0 1px 2px rgba(20,35,50,.025); --shadow: 0 2px 8px rgba(20,35,50,.035);
  --shadow-lg: 0 10px 30px rgba(20,35,50,.08); --shadow-float: 0 14px 40px rgba(20,35,50,.13);
  --side-w: 248px; --radius-xl: 16px; --radius-lg: 14px; --radius-md: 10px;
  --side-muted: #536271; --side-sub: #758190; --side-label: #687585; --side-note: #768291;
  --pearls-bg: #f3f8f5; --pearls-line: #deebe3; --pitfalls-bg: #fffbf3; --pitfalls-line: #ede3cf;
}
html[data-theme="dark"][data-accent] {
  --bg: #111720; --card: #19222d; --card-elevated: #202b38;
  --ink: #e3e9f0; --ink-soft: #a1adbc; --line: #2c3745; --line-subtle: #25303d;
  --topbar-bg: #151d27; --foot-bg: #111720; --home-hover: #222e3b; --hover-line: #52646a;
  --ov-job-bg: #1b2a30; --ov-job-line: #34434b;
  --shadow-sm: none; --shadow: none; --shadow-lg: 0 10px 30px rgba(0,0,0,.16); --shadow-float: 0 14px 40px rgba(0,0,0,.3);
  --side-muted: #aeb9c7; --side-sub: #8a99ab; --side-label: #93a1b3; --side-note: #8a99ab;
  --pearls-bg: #1b2928; --pearls-line: #30433d; --pitfalls-bg: #2b2823; --pitfalls-line: #454034;
}
html[data-theme="light"][data-accent="emerald"] { --brand: #235c50; --brand-2: #235c50; --accent: #287263; --accent-2: #438575; --accent-rgb: 40,114,99; --on-fill: #fff; }
html[data-theme="dark"][data-accent="emerald"] { --brand: #9bcdbf; --brand-2: #9bcdbf; --accent: #8dc5b5; --accent-2: #8dc5b5; --accent-rgb: 141,197,181; --on-fill: #152923; }
html[data-weight="bold"] { --font-weight-body: 500; --font-weight-title: 650; }
html:not([data-weight="bold"]) { --font-weight-body: 400; --font-weight-title: 600; }
.ui-icon { width: 19px; height: 19px; display: block; flex: none; }
body { line-height: 1.65; }
body button { box-shadow: none; }
.main .stage { width: 100%; max-width: 1120px; margin-inline: auto; padding: 36px 40px 48px; }
.sidebar { background: var(--card); color: var(--ink); border-right: 1px solid var(--line); box-shadow: none; padding: 22px 16px 16px; }
.sidebar > .brand, .sidebar > .side-list, .sidebar > .side-footer { flex-shrink: 0; }
.brand { padding: 2px 8px 24px; gap: 10px; }
.brand-mark { width: 36px; height: 36px; border-radius: 10px; background: var(--brand-2); color: var(--on-fill); font-size: .94rem; font-weight: 700; box-shadow: none; }
.brand-text strong { color: var(--ink); font-size: .96rem; font-weight: 650; }
.brand-text span { font-size: .65rem; }
.brand:hover .brand-mark { transform: none; }
.side-list { gap: 6px; }
.side-item { min-height: 44px; padding: 10px 12px; font-size: .81rem; font-weight: 500; border-radius: 8px; }
.side-item .ico { display: inline-flex; align-items: center; justify-content: center; width: 26px; height: 26px; flex: none; border-radius: 7px; background: var(--ov-job-bg); color: var(--brand-2); font-style: normal; }
/* Hybrid mono icons: original emoji kept in data.js for rollback, rendered as stroke SVG via app.js iconFor(). */
.side-item .ico .mono-ico { width: 16px; height: 16px; }
.side-item:hover { transform: none; background: var(--home-hover); color: var(--ink); }
.side-item.side-home { margin-bottom: 0; background: none; border-color: transparent; color: var(--ink); }
.side-item.active, .side-item.side-home.active { background: var(--ov-job-bg); border-color: transparent; color: var(--brand-2); box-shadow: inset 3px 0 0 var(--accent); }
.side-group { margin: 6px 0 0; }
.side-group > summary { min-height: 44px; padding: 12px 8px; cursor: pointer; font-size: .72rem; font-weight: 600; letter-spacing: .01em; text-transform: none; color: var(--side-label); line-height: 1.4; }
.side-group[open] > summary { color: var(--ink); }
.side-group .side-item { padding-left: 20px; }
.side-footer { border-color: var(--line); padding-top: 12px; margin-top: auto; }
.side-btn { justify-content: flex-start; padding-inline: 10px; font-weight: 500; border-color: transparent; background: transparent; }
.side-btn:hover { background: var(--home-hover); color: var(--ink); border-color: transparent; }
.side-note { font-size: .67rem; line-height: 1.6; }
.topbar { display: grid; grid-template-columns: 44px minmax(180px,1fr) auto auto; gap: 18px; padding: 14px 32px; background: var(--topbar-bg); box-shadow: none; border-bottom: 1px solid var(--line-subtle); -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px); }
.topbar > .burger { display: flex; grid-column: 1; grid-row: 1; width: 44px; min-width: 44px; height: 44px; padding: 0; border: 1px solid var(--line); border-radius: 9px; background: transparent; color: var(--ink-soft); align-items: center; justify-content: center; cursor: pointer; }
.primary-nav { display: flex; align-items: center; gap: 3px; grid-column: 3; grid-row: 1; }
.primary-nav .home-btn { width: auto; min-width: 0; height: 44px; padding: 0 11px; font-size: .8rem; font-weight: 550; border: 0; border-radius: 8px; color: var(--ink-soft); background: transparent; gap: 7px; box-shadow: none; }
.primary-nav #homeBtn, .primary-nav #studyBtn, .primary-nav #shiftBtn, .primary-nav #ecgBtn { grid-column: auto; grid-row: auto; width: auto; min-width: 0; display: flex; align-items: center; justify-content: center; font-size: .8rem; padding: 0 11px; }
.primary-nav #homeBtn .header-label, .primary-nav #studyBtn .header-label, .primary-nav #shiftBtn .header-label, .primary-nav #ecgBtn .header-label { display: inline; font-size: inherit; }
.primary-nav .home-btn:hover { transform: none; color: var(--ink); background: var(--home-hover); box-shadow: none; }
.primary-nav .home-btn.active-nav, html[data-theme="dark"] .primary-nav .home-btn.active-nav { background: var(--ov-job-bg); color: var(--brand-2); border-color: transparent; box-shadow: none; }
.topbar > .searchwrap { grid-column: 2; grid-row: 1; width: 100%; max-width: 460px; min-width: 0; min-height: 44px; padding: 8px 12px; border: 1px solid var(--line); border-radius: 9px; background: var(--bg); box-shadow: none; margin: 0; }
#searchInput { font-size: .84rem; }
.search-ico { opacity: 1; color: var(--ink-soft); }
.topbar > .tools-toggle { display: flex; grid-column: 4; grid-row: 1; min-width: 44px; width: 44px; height: 44px; padding: 0; border: 1px solid var(--line); border-radius: 9px; background: transparent; color: var(--ink-soft); box-shadow: none; }
.tools-toggle .header-label { display: none; }
.topbar > .topbar-tools { display: none; position: absolute; left: auto; top: calc(100% + 8px); right: 24px; width: 380px; max-width: calc(100vw - 24px); padding: 18px; margin: 0; border: 1px solid var(--line); border-radius: 12px; background: var(--card); box-shadow: var(--shadow-float); }
.topbar > .topbar-tools.open { display: flex; flex-direction: column; align-items: stretch; gap: 14px; }
.topbar-tools .chips { justify-content: space-between; flex-wrap: wrap; }
.topbar-tools .pref-scale { font-size: 13px; white-space: nowrap; }
.topbar-tools .pref-tools { justify-content: center; background: var(--bg); border-radius: 8px; padding: 4px; }
.topbar-tools .accent-tools { border: 0; padding: 0; background: transparent; justify-content: center; }
.pref-btn, .chip, .patient-chip { box-shadow: none; font-weight: 550; border-width: 1px; border-radius: 8px; }
.accent-dot { width: 34px; height: 34px; }
.home-intro { padding: 8px 0 26px; max-width: 760px; margin-inline: 0; }
.home-eyebrow, .home-intro > span { color: var(--brand-2); font-size: .74rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; }
.home-intro h1 { font-size: clamp(1.8rem,3vw,2.6rem); letter-spacing: -.035em; line-height: 1.16; margin: 10px 0 12px; max-width: 650px; font-weight: 650; }
.home-intro p { color: var(--ink-soft); max-width: 58ch; font-size: .96rem; line-height: 1.65; }
.home-meta { display: flex; flex-wrap: wrap; gap: 6px 14px; margin-top: 16px; color: var(--ink-soft); font-size: .73rem; }
.home-meta span + span::before { content: "·"; margin-right: 14px; opacity: .6; }
.home-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 22px; }
.home-actions button { min-height: 44px; border: 1px solid var(--line); border-radius: 9px; padding: 10px 16px; background: var(--card); color: var(--ink); font: inherit; font-size: .84rem; font-weight: 600; cursor: pointer; }
.home-actions button:first-child { background: var(--brand-2); border-color: var(--brand-2); color: var(--on-fill); }
.study-dashboard.study-dashboard-compact { background: var(--card); border: 1px solid var(--line); border-radius: 12px; box-shadow: none; padding: 18px 22px; margin: 0 0 32px; gap: 20px; }
.study-dashboard-compact h2 { font-size: .95rem; font-weight: 600; margin: 0; }
.study-dashboard-compact .study-kicker { display: none; }
.study-dashboard-compact p { font-size: .79rem; }
.study-dashboard-compact .study-stats { width: 100%; display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 8px; }
.study-dashboard-compact .study-stat:first-child { border-left: 0; }
.study-dashboard-compact .study-stat:last-child strong { font-size: .95rem; color: var(--brand-2); }
.study-dashboard-compact .study-stat { min-width: 96px; border: 0; border-left: 1px solid var(--line); border-radius: 0; padding: 6px 14px; background: none; box-shadow: none; transform: none; }
.study-dashboard-compact .study-stat strong { color: var(--ink); font-weight: 600; font-size: 1.2rem; }
.study-dashboard-compact .study-stat span { color: var(--ink-soft); font-size: .72rem; font-weight: 500; letter-spacing: 0; text-transform: none; }
.study-dashboard-compact .study-stat.accent, html[data-theme="dark"] .study-dashboard-compact .study-stat.accent { background: var(--ov-job-bg); border: 0; border-radius: 8px; box-shadow: none; }
.study-dashboard-compact .study-stat.accent strong, .study-dashboard-compact .study-stat.accent span { color: var(--brand-2); }
.library-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 16px; }
.library-head h2 { font-size: 1.25rem; font-weight: 600; letter-spacing: -.02em; }
.library-head p, .library-head > span { font-size: .8rem; color: var(--ink-soft); }
.library-filters { margin: 0; padding: 0; }
.library-filters[open] { flex-basis: 100%; }
.library-head:has(.library-filters[open]) { flex-wrap: wrap; }
.library-filters > summary { cursor: pointer; min-height: 44px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--card); color: var(--ink-soft); font-size: .78rem; }
.library-filters .patient-filter { flex-wrap: wrap; margin: 10px 0 0; overflow: visible; }
.home-group { margin-bottom: 30px; }
.group-title { font-size: .86rem; font-weight: 600; color: var(--ink-soft); letter-spacing: 0; text-transform: none; margin: 0 0 12px; }
.group-title span { border: 0; background: var(--line-subtle); color: var(--ink-soft); padding: 1px 7px; font-weight: 500; }
.cp-grid { grid-template-columns: repeat(2,minmax(0,1fr)); gap: 10px; }
.cp-grid .cp-card { display: grid; grid-template-columns: auto minmax(0,1fr) auto; grid-template-rows: auto auto; align-content: center; align-items: center; gap: 6px 12px; min-height: 106px; padding: 18px 20px; border: 1px solid var(--line); border-radius: 13px; background: var(--card); box-shadow: var(--shadow-sm); transition: transform var(--transition-fast) var(--ease-out), box-shadow var(--transition-fast) ease, border-color var(--transition-fast) ease, background var(--transition-fast) ease; }
.cp-grid .cp-card::before { display: none; }
.cp-grid .cp-card:hover { transform: translateY(-2px); background: var(--card); border-color: var(--hover-line); box-shadow: var(--shadow); }
/* Medical SVG icon tile */
.cp-card .cp-ico { display: inline-flex; align-items: center; justify-content: center; width: 44px; height: 44px; padding: 6px; border-radius: 12px; background: var(--ov-job-bg); grid-column: 1; grid-row: 1; justify-self: start; margin: 0; flex: none; transition: transform var(--transition-fast) ease, box-shadow var(--transition-fast) ease; }
.cp-card .cp-ico .mono-ico { width: 20px; height: 20px; }
.cp-card .cp-ico .color-ico { width: 30px; height: 30px; }
.cp-grid .cp-card:hover .cp-ico { transform: scale(1.08) translateY(-1px); box-shadow: 0 4px 12px rgba(0,0,0,0.12); }
.cp-hero .cp-ico-lg { display: inline-flex; align-items: center; justify-content: center; width: 58px; height: 58px; padding: 9px; border-radius: 16px; background: var(--ov-job-bg); border: 1px solid var(--line); margin-bottom: 12px; box-shadow: var(--shadow-sm); flex: none; }
.cp-hero .cp-ico-lg .mono-ico { width: 26px; height: 26px; }
.cp-hero .cp-ico-lg .color-ico { width: 40px; height: 40px; }
.cp-grid .cp-card h3 { grid-column: 2; grid-row: 1; margin: 0; padding: 0; color: var(--ink); font-weight: 600; font-size: .97rem; line-height: 1.4; }
.cp-grid .cp-card p { grid-column: 2 / -1; grid-row: 2; margin: 0; font-size: .78rem; line-height: 1.5; color: var(--ink-soft); }
.cp-grid .cp-card .cp-count { position: static; grid-column: 3; grid-row: 1; align-self: center; color: var(--ink-soft); background: var(--line-subtle); border: 1px solid var(--line); border-radius: 9999px; padding: 2px 8px; font-size: .68rem; font-weight: 550; white-space: nowrap; transition: border-color var(--transition-fast) ease, color var(--transition-fast) ease; }
.cp-grid .cp-card:hover .cp-count { border-color: var(--hover-line); color: var(--brand-2); }
.cp-grid .cp-reviewed, .cp-grid .cp-saved { position: static; grid-column: 2 / -1; color: var(--brand-2); font-size: .7rem; margin: 2px 0 0; }
.cp-hero { background: transparent; border: 0; box-shadow: none; padding: 0 0 26px; margin-bottom: 0; border-radius: 0; }
.cp-hero::before, .cp-hero::after { display: none; }
.cp-hero h1 { color: var(--ink); font-size: clamp(1.7rem,3vw,2.3rem); line-height: 1.2; letter-spacing: -.03em; font-weight: 650; }
.cp-hero .tag, .cp-hero .ecg-subhead { color: var(--ink-soft); font-size: .96rem; max-width: 70ch; line-height: 1.65; }
.cp-hero .back-btn { position: static; display: inline-flex; border: 0; background: none; color: var(--ink-soft); padding: 0; margin: 0 0 14px; min-height: 36px; font-size: .77rem; font-weight: 500; box-shadow: none; }
.case-rail { display: block; border: 1px solid var(--ov-job-line); border-left: 3px solid var(--accent); background: var(--ov-job-bg); padding: 20px 24px; border-radius: 12px; box-shadow: none; margin-bottom: 20px; }
.case-rail-title { margin-bottom: 10px; display: flex; align-items: center; gap: 12px; }
/* Hybrid: mono bolt tile. Rollback: restore `display:none`. */
.case-rail-title > span { display: inline-flex; align-items: center; justify-content: center; width: 34px; height: 34px; flex: none; border-radius: 9px; background: rgba(var(--accent-rgb), 0.14); color: var(--brand-2); }
.case-rail-title > span .mono-ico { width: 18px; height: 18px; }
.case-rail-title strong { font-size: .98rem; font-weight: 600; color: var(--ink); }
.case-rail-title small { font-size: .75rem; color: var(--ink-soft); }
.case-steps { display: grid; grid-template-columns: 1fr; gap: 8px; }
.case-steps li { font-size: .86rem; line-height: 1.6; padding: 0; background: none; border: 0; }
.case-steps li > span { background: transparent; color: var(--brand-2); font-size: .78rem; width: 22px; height: auto; border: 0; }
.case-actions { margin-top: 16px; display: flex; flex-wrap: wrap; gap: 8px; }
.case-action, .case-action.primary { min-height: 44px; flex: 0 1 auto; border: 1px solid var(--line); color: var(--ink); background: var(--card); border-radius: 8px; font-weight: 550; font-size: .77rem; padding: 8px 12px; box-shadow: none; white-space: normal; }
.breadcrumbs { display: flex; align-items: center; gap: 5px; margin: 0 0 10px; font-size: .78rem; color: var(--ink-soft); }
.crumb-group { color: var(--ink-soft); }
.crumb-sep { color: var(--ink-soft); opacity: .55; }
.presentation-study-group { scroll-margin-top: 140px; }
.medication-safety { margin-top: 16px; border-top: 1px solid var(--line); padding-top: 8px; font-size: .82rem; color: var(--ink-soft); }
.medication-safety summary { min-height: 44px; padding: 10px 0; cursor: pointer; font-weight: 550; }
.medication-safety p + p { margin-top: 8px; }
.clinical-safety-note { margin-top: 16px; color: var(--ink-soft); font-size: .8rem; }
.presentation-toc { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 24px; padding: 0 0 18px; border-bottom: 1px solid var(--line); }
.section-jump { min-height: 44px; border: 0; border-radius: 8px; background: transparent; color: var(--ink-soft); font: inherit; font-size: .79rem; font-weight: 500; padding: 8px 11px; cursor: pointer; }
.section-jump:hover { color: var(--brand-2); background: var(--ov-job-bg); }
.section-card { border: 1px solid var(--line); border-radius: 13px; box-shadow: var(--shadow-sm); margin-bottom: 14px; overflow: hidden; background: var(--card); transition: border-color var(--transition-fast) ease, box-shadow var(--transition-fast) ease; }
.section-card:hover { border-color: var(--hover-line); }
.sec-head { padding: 18px 22px; min-height: 62px; background: var(--card); border: 0; gap: 10px; color: var(--ink); font-size: 1rem; font-weight: 600; }
/* ── iOS 18 squircle badge for section headers ── */
.sec-head .sec-ico {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 9px;
    flex: none;
    background: var(--surface-2, rgba(0, 0, 0, 0.05));
    color: var(--brand-2);
    transition: transform var(--transition-fast) ease, background var(--transition-fast) ease;
}
.sec-head .sec-ico .mono-ico,
.sec-head .sec-ico svg {
    width: 17px;
    height: 17px;
    display: block;
    stroke: currentColor;
    stroke-width: 2.1;
}
.sec-head .arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: none;
    width: 26px;
    height: 26px;
    border-radius: 8px;
    background: transparent;
    color: var(--ink-soft);
    margin-left: auto;
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), background var(--transition-fast) ease;
}
.sec-head .arrow .sec-chevron,
.sec-head .arrow svg {
    width: 14px;
    height: 14px;
    display: block;
    stroke: currentColor;
}
/* ── Distinct per-presentation icons (each subject keeps its own emoji) + mono system chrome ── */
.mono-ico { display: block; flex: none; }
.color-ico { display: block; width: 100%; height: 100%; flex: none; }
.emoji-ico { display: inline-flex; align-items: center; justify-content: center; flex: none; min-width: 1.25em; line-height: 1.25; font-family: "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji", sans-serif; font-style: normal; font-weight: 400; letter-spacing: 0; vertical-align: middle; }
.cp-ico .mono-ico, .cp-ico-lg .mono-ico, .side-item .ico .mono-ico, .case-rail-title .mono-ico, .study-topic-ico .mono-ico { stroke: currentColor; }
.cp-ico .emoji-ico { font-size: 1.35rem; }
.cp-ico-lg .emoji-ico { font-size: 1.9rem; }
.side-item .ico .emoji-ico { font-size: 1.05rem; }
.study-topic-ico .emoji-ico { font-size: 1.1rem; }
.related-chip .emoji-ico { margin-right: 4px; }
.side-item .ico { display: inline-flex; align-items: center; justify-content: center; width: 28px; height: 28px; padding: 4px; flex: none; border-radius: 8px; font-style: normal; }
.side-item .ico .color-ico { width: 19px; height: 19px; }
.study-topic-ico { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; padding: 5px; flex: none; border-radius: 10px; background: var(--ov-job-bg); }
.study-topic-ico .mono-ico { width: 17px; height: 17px; }
.study-topic-ico .color-ico { width: 24px; height: 24px; }
.related-chip .mono-ico { width: 14px; height: 14px; display: inline-block; vertical-align: -2px; margin-right: 4px; }
.chip-ico { display: inline-flex; align-items: center; justify-content: center; width: 22px; height: 22px; padding: 2px; flex: none; border-radius: 6px; }
.chip-ico .color-ico { width: 16px; height: 16px; }
.res-ico .color-ico { width: 22px; height: 22px; }

/* ── Category Pod Themes ── */
[data-cat] { transition: background var(--transition-fast) ease, border-color var(--transition-fast) ease, box-shadow var(--transition-fast) ease; }
[data-cat="cardio"] { background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%); border: 1px solid rgba(239, 68, 68, 0.45); box-shadow: 0 2px 6px rgba(239, 68, 68, 0.12); }
[data-cat="pulm"] { background: linear-gradient(135deg, #e0f2fe 0%, #bae6fd 100%); border: 1px solid rgba(14, 165, 233, 0.45); box-shadow: 0 2px 6px rgba(14, 165, 233, 0.12); }
[data-cat="neuro"] { background: linear-gradient(135deg, #ede9fe 0%, #ddd6fe 100%); border: 1px solid rgba(139, 92, 246, 0.45); box-shadow: 0 2px 6px rgba(139, 92, 246, 0.12); }
[data-cat="gi"] { background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%); border: 1px solid rgba(245, 158, 11, 0.45); box-shadow: 0 2px 6px rgba(245, 158, 11, 0.12); }
[data-cat="gu"] { background: linear-gradient(135deg, #ffedd5 0%, #fed7aa 100%); border: 1px solid rgba(249, 115, 22, 0.45); box-shadow: 0 2px 6px rgba(249, 115, 22, 0.12); }
[data-cat="infect"] { background: linear-gradient(135deg, #ffe4e6 0%, #fecdd3 100%); border: 1px solid rgba(244, 63, 94, 0.45); box-shadow: 0 2px 6px rgba(244, 63, 94, 0.12); }
[data-cat="toxic"] { background: linear-gradient(135deg, #dcfce7 0%, #bbf7d0 100%); border: 1px solid rgba(34, 197, 94, 0.45); box-shadow: 0 2px 6px rgba(34, 197, 94, 0.12); }
[data-cat="trauma"] { background: linear-gradient(135deg, #fee2e2 0%, #fca5a5 100%); border: 1px solid rgba(220, 38, 38, 0.5); box-shadow: 0 2px 6px rgba(220, 38, 38, 0.15); }
[data-cat="peds"] { background: linear-gradient(135deg, #ccfbf1 0%, #99f6e4 100%); border: 1px solid rgba(20, 184, 166, 0.45); box-shadow: 0 2px 6px rgba(20, 184, 166, 0.12); }
[data-cat="obgyn"] { background: linear-gradient(135deg, #fae8ff 0%, #f5d0fe 100%); border: 1px solid rgba(217, 70, 239, 0.45); box-shadow: 0 2px 6px rgba(217, 70, 239, 0.12); }
[data-cat="msk"] { background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%); border: 1px solid rgba(100, 116, 139, 0.4); box-shadow: 0 2px 6px rgba(100, 116, 139, 0.1); }
[data-cat="ent"] { background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%); border: 1px solid rgba(16, 185, 129, 0.45); box-shadow: 0 2px 6px rgba(16, 185, 129, 0.12); }
[data-cat="derm"] { background: linear-gradient(135deg, #fff1f2 0%, #ffe4e6 100%); border: 1px solid rgba(251, 113, 133, 0.45); box-shadow: 0 2px 6px rgba(251, 113, 133, 0.12); }
[data-cat="airway"] { background: linear-gradient(135deg, #ffedd5 0%, #fed7aa 100%); border: 1px solid rgba(249, 115, 22, 0.5); box-shadow: 0 2px 6px rgba(249, 115, 22, 0.15); }
[data-cat="psych"] { background: linear-gradient(135deg, #e0e7ff 0%, #c7d2fe 100%); border: 1px solid rgba(99, 102, 241, 0.45); box-shadow: 0 2px 6px rgba(99, 102, 241, 0.12); }
[data-cat="endocrine"] { background: linear-gradient(135deg, #fef9c3 0%, #fef08a 100%); border: 1px solid rgba(234, 179, 8, 0.45); box-shadow: 0 2px 6px rgba(234, 179, 8, 0.12); }
[data-cat="environ"] { background: linear-gradient(135deg, #e0f2fe 0%, #fed7aa 100%); border: 1px solid rgba(14, 165, 233, 0.4); box-shadow: 0 2px 6px rgba(14, 165, 233, 0.1); }
[data-cat="ecg"] { background: linear-gradient(135deg, #fee2e2 0%, #ccfbf1 100%); border: 1px solid rgba(239, 68, 68, 0.45); box-shadow: 0 2px 6px rgba(239, 68, 68, 0.12); }
[data-cat="learn"] { background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%); border: 1px solid rgba(59, 130, 246, 0.45); box-shadow: 0 2px 6px rgba(59, 130, 246, 0.12); }
[data-cat="home"], [data-cat="generic"] { background: var(--ov-job-bg); border: 1px solid var(--line); }


/* Clinical system hue, shared by cards, group headings and the hero cap.
   Derived from the existing [data-cat] themes so there is one source. */
[data-cat="cardio"] { --cat: 239, 68, 68; }
[data-cat="pulm"] { --cat: 14, 165, 233; }
[data-cat="neuro"] { --cat: 139, 92, 246; }
[data-cat="gi"] { --cat: 245, 158, 11; }
[data-cat="gu"] { --cat: 249, 115, 22; }
[data-cat="infect"] { --cat: 244, 63, 94; }
[data-cat="toxic"] { --cat: 34, 197, 94; }
[data-cat="trauma"] { --cat: 220, 38, 38; }
[data-cat="peds"] { --cat: 20, 184, 166; }
[data-cat="obgyn"] { --cat: 217, 70, 239; }
[data-cat="msk"] { --cat: 100, 116, 139; }
[data-cat="ent"] { --cat: 16, 185, 129; }
[data-cat="derm"] { --cat: 251, 113, 133; }
[data-cat="airway"] { --cat: 249, 115, 22; }
[data-cat="psych"] { --cat: 99, 102, 241; }
[data-cat="endocrine"] { --cat: 234, 179, 8; }
[data-cat="environ"] { --cat: 14, 165, 233; }
[data-cat="ecg"] { --cat: 239, 68, 68; }
[data-cat="learn"] { --cat: 59, 130, 246; }
[data-cat="home"] { --cat: 100, 116, 139; }
[data-cat="generic"] { --cat: 100, 116, 139; }

/* Dark mode category luminances */
html[data-theme="dark"] [data-cat="cardio"] { background: linear-gradient(135deg, rgba(239, 68, 68, 0.24) 0%, rgba(185, 28, 28, 0.16) 100%); border-color: rgba(239, 68, 68, 0.42); box-shadow: 0 2px 8px rgba(239, 68, 68, 0.2); }
html[data-theme="dark"] [data-cat="pulm"] { background: linear-gradient(135deg, rgba(14, 165, 233, 0.24) 0%, rgba(2, 132, 199, 0.16) 100%); border-color: rgba(56, 189, 248, 0.42); box-shadow: 0 2px 8px rgba(14, 165, 233, 0.2); }
html[data-theme="dark"] [data-cat="neuro"] { background: linear-gradient(135deg, rgba(139, 92, 246, 0.24) 0%, rgba(109, 40, 217, 0.16) 100%); border-color: rgba(167, 139, 250, 0.42); box-shadow: 0 2px 8px rgba(139, 92, 246, 0.2); }
html[data-theme="dark"] [data-cat="gi"] { background: linear-gradient(135deg, rgba(245, 158, 11, 0.24) 0%, rgba(180, 83, 9, 0.16) 100%); border-color: rgba(251, 191, 36, 0.42); box-shadow: 0 2px 8px rgba(245, 158, 11, 0.2); }
html[data-theme="dark"] [data-cat="gu"] { background: linear-gradient(135deg, rgba(249, 115, 22, 0.24) 0%, rgba(194, 65, 12, 0.16) 100%); border-color: rgba(251, 146, 60, 0.42); box-shadow: 0 2px 8px rgba(249, 115, 22, 0.2); }
html[data-theme="dark"] [data-cat="infect"] { background: linear-gradient(135deg, rgba(244, 63, 94, 0.24) 0%, rgba(190, 18, 60, 0.16) 100%); border-color: rgba(251, 113, 133, 0.42); box-shadow: 0 2px 8px rgba(244, 63, 94, 0.2); }
html[data-theme="dark"] [data-cat="toxic"] { background: linear-gradient(135deg, rgba(34, 197, 94, 0.24) 0%, rgba(21, 128, 61, 0.16) 100%); border-color: rgba(74, 222, 128, 0.42); box-shadow: 0 2px 8px rgba(34, 197, 94, 0.2); }
html[data-theme="dark"] [data-cat="trauma"] { background: linear-gradient(135deg, rgba(239, 68, 68, 0.28) 0%, rgba(153, 27, 27, 0.18) 100%); border-color: rgba(239, 68, 68, 0.46); box-shadow: 0 2px 8px rgba(239, 68, 68, 0.25); }
html[data-theme="dark"] [data-cat="peds"] { background: linear-gradient(135deg, rgba(20, 184, 166, 0.24) 0%, rgba(15, 118, 110, 0.16) 100%); border-color: rgba(45, 212, 191, 0.42); box-shadow: 0 2px 8px rgba(20, 184, 166, 0.2); }
html[data-theme="dark"] [data-cat="obgyn"] { background: linear-gradient(135deg, rgba(217, 70, 239, 0.24) 0%, rgba(162, 28, 175, 0.16) 100%); border-color: rgba(232, 121, 249, 0.42); box-shadow: 0 2px 8px rgba(217, 70, 239, 0.2); }
html[data-theme="dark"] [data-cat="msk"] { background: linear-gradient(135deg, rgba(148, 163, 184, 0.22) 0%, rgba(71, 85, 105, 0.16) 100%); border-color: rgba(148, 163, 184, 0.38); box-shadow: 0 2px 8px rgba(100, 116, 139, 0.15); }
html[data-theme="dark"] [data-cat="ent"] { background: linear-gradient(135deg, rgba(16, 185, 129, 0.24) 0%, rgba(5, 150, 105, 0.16) 100%); border-color: rgba(52, 211, 153, 0.42); box-shadow: 0 2px 8px rgba(16, 185, 129, 0.2); }
html[data-theme="dark"] [data-cat="derm"] { background: linear-gradient(135deg, rgba(244, 63, 94, 0.22) 0%, rgba(225, 29, 72, 0.16) 100%); border-color: rgba(251, 113, 133, 0.38); box-shadow: 0 2px 8px rgba(244, 63, 94, 0.18); }
html[data-theme="dark"] [data-cat="airway"] { background: linear-gradient(135deg, rgba(249, 115, 22, 0.26) 0%, rgba(194, 65, 12, 0.18) 100%); border-color: rgba(249, 115, 22, 0.46); box-shadow: 0 2px 8px rgba(249, 115, 22, 0.25); }
html[data-theme="dark"] [data-cat="psych"] { background: linear-gradient(135deg, rgba(99, 102, 241, 0.24) 0%, rgba(67, 56, 202, 0.16) 100%); border-color: rgba(129, 140, 248, 0.42); box-shadow: 0 2px 8px rgba(99, 102, 241, 0.2); }
html[data-theme="dark"] [data-cat="endocrine"] { background: linear-gradient(135deg, rgba(234, 179, 8, 0.24) 0%, rgba(161, 98, 7, 0.16) 100%); border-color: rgba(250, 204, 21, 0.42); box-shadow: 0 2px 8px rgba(234, 179, 8, 0.2); }
html[data-theme="dark"] [data-cat="environ"] { background: linear-gradient(135deg, rgba(14, 165, 233, 0.22) 0%, rgba(249, 115, 22, 0.18) 100%); border-color: rgba(56, 189, 248, 0.38); box-shadow: 0 2px 8px rgba(14, 165, 233, 0.18); }
html[data-theme="dark"] [data-cat="ecg"] { background: linear-gradient(135deg, rgba(239, 68, 68, 0.26) 0%, rgba(20, 184, 166, 0.18) 100%); border-color: rgba(248, 113, 113, 0.42); box-shadow: 0 2px 8px rgba(239, 68, 68, 0.22); }
html[data-theme="dark"] [data-cat="learn"] { background: linear-gradient(135deg, rgba(59, 130, 246, 0.24) 0%, rgba(29, 78, 216, 0.16) 100%); border-color: rgba(96, 165, 250, 0.42); box-shadow: 0 2px 8px rgba(59, 130, 246, 0.2); }
html[data-theme="dark"] [data-cat="home"], html[data-theme="dark"] [data-cat="generic"] { background: var(--ov-job-bg); border: 1px solid var(--line); }
/* Severity dots replace 🔴🟠🟢 emoji — text label preserved for a11y/print. */
.sev-dot { display: inline-block; width: 9px; height: 9px; border-radius: 50%; flex: none; background: var(--ink-soft); }
.sev-critical > h4 .sev-dot, .sev-dot.sev-critical, .dx-card.sev-critical h4 .sev-dot { background: var(--critical); }
.sev-emergent > h4 .sev-dot, .sev-dot.sev-emergent, .dx-card.sev-emergent h4 .sev-dot { background: var(--emergent); }
.sev-common > h4 .sev-dot, .sev-dot.sev-common, .dx-card.sev-common h4 .sev-dot { background: var(--common); }
.ecg-pattern header .sev-tag { display: inline-flex; align-items: center; gap: 6px; }
.chip { display: inline-flex; align-items: center; gap: 7px; }
.chip .sev-dot { width: 8px; height: 8px; }
.pref-btn .mono-ico { width: 16px; height: 16px; }
.theme-ico { display: inline-flex; }
.theme-ico .mono-ico { width: 16px; height: 16px; }
/* Disclaimer + point icons: mono tiles (replaces ⚠️🩺⚖️📚 colorful emoji). */
.badge-icon, .point-ico { display: inline-flex; align-items: center; justify-content: center; font-style: normal; }
.badge-icon .mono-ico, .point-ico .mono-ico { width: 18px; height: 18px; }
.point-ico { width: 34px; height: 34px; flex: none; border-radius: 9px; background: var(--ov-job-bg); color: var(--brand-2); }
.sec-body { padding: 0 22px 22px; border-top: 0; }
.section-card.closed .sec-head { background: var(--card); }
.cluster, .wu-col { border: 0; background: var(--bg); border-radius: 8px; padding: 15px 16px; box-shadow: none; }
.cluster h4, .wu-col h4 { font-size: .88rem; font-weight: 600; color: var(--ink); letter-spacing: 0; text-transform: none; }
.cluster p, .wu-col li, .disp-col li, .plain-list li, .dx-key, .rf-item { font-size: .86rem; line-height: 1.65; }
.dx-card, .dx-card.sev-critical, .dx-card.sev-emergent, .dx-card.sev-common { background: var(--card); box-shadow: none; border-width: 1px; border-left-width: 3px; border-radius: 8px; padding: 15px 16px; }
.dx-card h4 { font-size: .88rem; line-height: 1.5; font-weight: 600; }
.sev-tag { font-size: .64rem; font-weight: 600; letter-spacing: 0; }
.rf-box { border-radius: 9px; padding: 16px; }
.rf-item { border-radius: 7px; padding: 11px 12px; }
.pp-box { border-radius: 9px; border-width: 1px; }
.learning-loop, .personal-plan, .resus-card, .management-pivots { background: var(--card); border: 1px solid var(--line); border-radius: 12px; box-shadow: none; margin: 24px 0; padding: 22px; }
.learning-kicker, .study-kicker, .resus-kicker, .ov-kicker { font-size: .67rem; font-weight: 600; letter-spacing: .06em; }
.recall-card, .resus-grid > div, .pivot-grid > div { border: 0; border-radius: 8px; background: var(--bg); }
.study-tabs button span { background: var(--line-subtle); color: var(--ink-soft); font-weight: 550; }
.back-btn, .shift-sheet .review-btn, .personal-plan .save-topic { border: 1px solid var(--line); border-radius: 8px; color: var(--brand-2); background: var(--card); font-weight: 550; box-shadow: none; }
.study-tabs { border-bottom: 1px solid var(--line); padding: 0 0 12px; margin-bottom: 28px; gap: 6px; }
.study-tabs button { border: 0; background: transparent; border-radius: 8px; padding: 10px 16px; font-size: .83rem; font-weight: 550; min-height: 44px; }
.study-tabs button.active, html[data-theme="dark"] .study-tabs button.active { background: var(--ov-job-bg); color: var(--brand-2); box-shadow: none; }
.study-page, .case-practice { border: 1px solid var(--line); border-radius: 14px; background: var(--card); box-shadow: none; }
.study-page-head, .case-practice-head { background: transparent; color: var(--ink); border-bottom: 1px solid var(--line); }
.study-page-head h1, .case-practice-head h1, .case-practice-head h2 { color: var(--ink); font-size: 1.65rem; letter-spacing: -.025em; font-weight: 600; }
.study-page-head p, .case-practice-head p { color: var(--ink-soft); font-size: .88rem; line-height: 1.65; }
.study-empty { text-align: center; padding: 44px 24px; color: var(--ink-soft); font-size: .9rem; }
.study-topic, .quiz-option { border-width: 1px; border-radius: 9px; box-shadow: none; font-weight: 500; }
.quiz-question { padding-block: 22px; border: 0; background: var(--bg); border-radius: 9px; }
.quiz-question legend { float: left; width: 100%; padding: 0; margin-bottom: 10px; }
.quiz-question legend + .quiz-options { clear: both; }
.quiz-question legend span { background: var(--ov-job-bg); color: var(--brand-2); font-weight: 600; }
.quiz-question legend { font-weight: 600; font-size: .96rem; }
.quiz-option { min-height: 48px; font-size: .85rem; line-height: 1.6; }
.shift-topline { gap: 12px; margin-bottom: 22px; }
.shift-topline select { border-width: 1px; border-radius: 9px; min-height: 44px; background: var(--card); font-weight: 500; }
.shift-sheet { padding: 26px; border: 1px solid var(--line); border-radius: 14px; box-shadow: none; }
.shift-sheet-head h1 { font-weight: 600; letter-spacing: -.025em; }
.shift-warning { background: var(--bg); color: var(--ink-soft); border: 0; border-radius: 8px; padding: 12px 14px; line-height: 1.6; }
.shift-grid { gap: 22px; }
.shift-grid section { background: var(--bg); border: 0; border-radius: 9px; padding: 18px; }
.shift-grid .shift-red { border-left: 3px solid var(--critical); }
.shift-grid h2 { font-size: .94rem; font-weight: 600; }
.shift-grid li, .shift-grid p { font-size: .86rem; line-height: 1.65; }
.ecg-step-nav { padding: 0 0 18px; margin-bottom: 22px; border-bottom: 1px solid var(--line); }
.ecg-step-chip { background: var(--card); border: 1px solid var(--line); border-radius: 8px; box-shadow: none; font-weight: 500; }
.ecg-step-chip span { background: var(--ov-job-bg); color: var(--brand-2); box-shadow: none; }
.ecg-pattern-index { margin: 18px 0; border: 1px solid var(--line); border-radius: 10px; background: var(--card); }
.ecg-pattern-index > summary { min-height: 48px; cursor: pointer; padding: 12px 18px; font-size: .9rem; font-weight: 550; }
.ecg-pattern-index .ecg-killers { padding: 0 18px 18px; }
.ecg-killer, .ecg-pattern { box-shadow: none; border-radius: 10px; }
.ecg-fig { border-radius: 10px; }
.ecg-tool, .ecg-wavebtn { box-shadow: none; font-weight: 550; border-width: 1px; border-radius: 8px; }
.foot { border-top: 1px solid var(--line); color: var(--ink-soft); background: var(--foot-bg); padding: 24px 40px; }
.foot p { max-width: 1000px; margin-inline: auto; font-size: .72rem; line-height: 1.7; }
@media (max-width: 1160px) and (min-width: 921px) {
  .topbar { padding-inline: 22px; gap: 10px; grid-template-columns: 44px minmax(120px,1fr) auto auto; }
  .primary-nav .home-btn { padding-inline: 8px; }
  /* Hybrid fix: keep header SVG visible on tablet — was `display:none` (bug). */
  .primary-nav .ui-icon { display: block; width: 17px; height: 17px; }
}
/* Narrow tablet (921–1000px): icon-only nav so burger + search + tools never clip. Labels return above 1000px. */
@media (max-width: 1000px) and (min-width: 921px) {
  .primary-nav #homeBtn .header-label, .primary-nav #studyBtn .header-label, .primary-nav #shiftBtn .header-label, .primary-nav #ecgBtn .header-label, .primary-nav #explorerBtn .header-label { display: none; }
  .primary-nav #homeBtn, .primary-nav #studyBtn, .primary-nav #shiftBtn, .primary-nav #ecgBtn, .primary-nav #explorerBtn { width: 44px; min-width: 44px; padding: 0; justify-content: center; }
  .topbar > .searchwrap { max-width: none; }
}
@media (max-width: 920px) {
  .main .stage { padding: 28px 24px 40px; }
  .topbar { grid-template-columns: 44px minmax(0,1fr) 44px; grid-template-rows: 44px 44px; padding: max(10px,env(safe-area-inset-top)) 20px 8px; gap: 8px 10px; }
  .topbar > .burger { display: flex; grid-column: 1; grid-row: 1; width: 44px; min-width: 44px; height: 44px; min-height: 44px; border: 0; background: transparent; color: var(--ink-soft); border-radius: 8px; box-shadow: none; align-items: center; justify-content: center; }
  .topbar > .searchwrap { grid-column: 2; grid-row: 1; max-width: none; }
  .topbar > .tools-toggle { grid-column: 3; grid-row: 1; border: 0; }
  .topbar > .primary-nav { grid-column: 1 / -1; grid-row: 2; display: grid; grid-template-columns: repeat(5,minmax(0,1fr)); gap: 3px; width: 100%; }
  .topbar > .primary-nav #homeBtn { grid-column: 1; grid-row: 1; }
  .topbar > .primary-nav #studyBtn { grid-column: 2; grid-row: 1; }
  .topbar > .primary-nav #shiftBtn { grid-column: 3; grid-row: 1; }
  .topbar > .primary-nav #ecgBtn { grid-column: 4; grid-row: 1; }
  .topbar > .primary-nav #explorerBtn { grid-column: 5; grid-row: 1; }
  .primary-nav #homeBtn, .primary-nav #studyBtn, .primary-nav #shiftBtn, .primary-nav #ecgBtn { width: 100%; padding: 0 6px; font-size: min(.75rem,13px); }
  .primary-nav .home-btn { justify-content: center; padding: 0 6px; height: 44px; min-height: 44px; width: 100%; font-size: .8rem; }
  .primary-nav .home-btn .header-label { display: inline; }
  .topbar > .topbar-tools { right: 12px; width: 360px; max-width: calc(100vw - 24px); }
  .study-dashboard-compact { flex-wrap: wrap; }
  .cp-hero { padding: 0 0 22px; }
}
@media (max-width: 600px) {
  .main .stage { padding: 24px 16px 36px; }
  .topbar { padding-inline: 12px; gap: 6px; }
  .primary-nav .ui-icon { width: 16px; height: 16px; }
  .primary-nav .home-btn { font-size: .75rem; gap: 5px; }
  .topbar > .searchwrap { min-height: 44px; border-radius: 8px; padding: 8px 10px; }
  #searchInput { font-size: .8rem; }
  .search-kbd { display: none; }
  .home-intro { padding: 0 0 24px; }
  .home-intro h1 { font-size: 1.9rem; margin-top: 9px; }
  .home-intro p { font-size: .9rem; }
  .home-actions { margin-top: 18px; gap: 8px; }
  .home-actions button { padding-inline: 13px; font-size: .79rem; }
  .study-dashboard.study-dashboard-compact { padding: 16px; gap: 14px; margin-bottom: 26px; }
  .study-dashboard-compact .study-stats { width: 100%; display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 6px; }
  .study-dashboard-compact .study-stat { min-width: 0; padding: 7px 4px; }
  .study-dashboard-compact .study-stat:first-child { border-left: 0; }
  .study-dashboard-compact .study-stat strong { font-size: 1.1rem; }
  .study-dashboard-compact .study-stat span { font-size: .7rem; }
  .library-head { flex-wrap: wrap; gap: 4px; margin-bottom: 8px; }
  .library-head h2 { font-size: 1.17rem; }
  .library-filters { margin: 8px 0 10px; }
  .cp-grid { grid-template-columns: minmax(0,1fr); gap: 9px; }
  .cp-grid .cp-card { min-height: 96px; padding: 16px; border-radius: 12px; gap: 4px 10px; }
  .cp-grid .cp-card h3 { font-size: .93rem; }
  .cp-grid .cp-card p { font-size: .77rem; }
  .cp-card .cp-ico { width: 38px; height: 38px; border-radius: 10px; padding: 5px; }
  .cp-card .cp-ico .mono-ico { width: 17px; height: 17px; }
  .cp-card .cp-ico .color-ico { width: 26px; height: 26px; }
  .group-title { font-size: .82rem; }
  .cp-hero h1 { font-size: 1.8rem; }
  .cp-hero .tag { font-size: .9rem; }
  .case-rail { padding: 16px; }
  .case-steps li { font-size: .83rem; }
  .case-actions { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); }
  .case-action { width: 100%; font-size: .75rem; }
  .presentation-toc { gap: 2px; margin-bottom: 18px; padding-bottom: 12px; }
  .section-jump { font-size: .75rem; padding: 7px 9px; }
  .sec-head { padding: 16px; font-size: .95rem; min-height: 60px; }
  .sec-body { padding: 0 16px 18px; }
  .cluster p, .wu-col li, .disp-col li, .plain-list li, .dx-key, .rf-item { font-size: .84rem; }
  .dx-grid, .cluster-grid, .wu-grid, .disp-grid { grid-template-columns: minmax(0,1fr); }
  .dx-card h4 { display: flex; flex-wrap: wrap; gap: 4px 8px; }
  .learning-loop, .personal-plan { padding: 18px; }
  .study-tabs { gap: 4px; margin-bottom: 22px; }
  .study-tabs button { padding-inline: 10px; font-size: .77rem; }
  .study-page-head h1, .case-practice-head h1 { font-size: 1.5rem; }
  .shift-sheet { padding: 18px; }
  .shift-grid { gap: 14px; }
  .shift-grid section { padding: 16px; }
  .foot { padding: 22px 18px calc(22px + env(safe-area-inset-bottom)); }
}
@media (prefers-reduced-motion: reduce) { .cp-grid .cp-card { transition: none; } }
@media print {
  .primary-nav, .presentation-toc, .breadcrumbs, .home-actions, .library-filters, .ecg-pattern-index { display: none !important; }
  .main .stage { padding: 0; max-width: none; }
  .cp-hero, .section-card, .study-page, .case-practice, .shift-sheet, .shift-grid section { background: #fff !important; color: #111 !important; box-shadow: none !important; }
  .cp-hero h1, .cp-hero .tag { color: #111 !important; }
}

/* Preserve legibility of ECG lettering rather than shrinking a full paper to phone width. */
.ecg-fig .ecg-media { overflow-x: auto; }
.ecg-fig .ecg-svg-wrap { min-width: 560px; }
.ecg-media:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.ecg-workbench-paper:has(.ecg-case-12lead) .ecg-workbench-canvas { min-width: 640px; }
.ecg-comparison { padding: 12px; border: 1px solid var(--line); border-radius: 10px; margin-block: 12px; }
.ecg-comparison h4 { margin: 0 0 10px; }
.ecg-comparison dt { font-weight: 700; margin-top: 10px; }
.ecg-comparison dd { margin: 4px 0 0; line-height: 1.6; }
.evidence-note { line-height: 1.6; font-size: .85rem; }
@media print {
  .ecg-fig .ecg-svg-wrap { min-width: 0 !important; }
  .ecg-fig .ecg-media { overflow: visible; }
}

.ecg-paper-help { margin: 0; padding: 8px 16px; font-size: .75rem; color: var(--ink-soft); }

/* ECG paper remains pink in both themes; its grid lives with the signal in SVG. */
.ecg-media, .ecg-lightbox-media, .ecg-workbench-paper { background: #fff1f2; }
.ecg-svg.ecg-paper { background-color: #fff1f2; }
.ecg-decorative-paper { pointer-events: none; }
.primary-nav #explorerBtn { display: flex; width: auto; min-width: 0; grid-column: auto; grid-row: auto; }
.primary-nav #explorerBtn .header-label { display: inline; }
.ecg-explorer { --ex-border: var(--line); padding-bottom: 24px; }
.explorer-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin: 6px 0 24px; }
.explorer-heading h1 { margin: 3px 0 8px; font-size: clamp(1.8rem,3vw,2.6rem); letter-spacing: -.04em; color: var(--ink); }
.explorer-heading p:not(.explorer-kicker) { margin: 0; color: var(--ink-soft); font-size: .9rem; line-height: 1.6; }
.explorer-kicker { margin: 0 0 6px; font-size: .67rem; letter-spacing: .14em; font-weight: 750; color: var(--brand-2); }
.ex-button { border: 1px solid var(--line); border-radius: 9px; background: var(--card); color: var(--ink); padding: 10px 14px; min-height: 44px; font: inherit; font-size: .8rem; cursor: pointer; }
.ex-button:hover { border-color: var(--brand-2); }
.ex-primary, .ex-button[aria-pressed="true"] { background: var(--brand); color: var(--on-fill); border-color: var(--brand); }
.explorer-heading > .ex-button { flex-shrink: 0; background: var(--brand); color: var(--on-fill); }
.explorer-controls { display: flex; align-items: end; flex-wrap: wrap; gap: 10px; padding: 16px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; margin-bottom: 16px; }
.explorer-controls label { display: grid; gap: 6px; font-size: .75rem; color: var(--ink-soft); min-width: 0; }
.explorer-controls label:first-child { flex: 1; min-width: 220px; }
.explorer-controls select { min-height: 44px; font: inherit; font-size: .85rem; color: var(--ink); background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 8px 12px; min-width: 0; width: 100%; }
.explorer-layout { display: grid; grid-template-columns: minmax(0,1fr) 300px; gap: 16px; align-items: start; }
.explorer-sheet { min-width: 0; border: 1px solid #e9bbc1; border-radius: 12px; overflow: hidden; background: #fff1f2; }
.explorer-paper-hint { display: flex; justify-content: space-between; gap: 8px; flex-wrap: wrap; padding: 12px 14px; font-size: .72rem; color: #713d47; border-bottom: 1px solid #e9bbc1; }
.explorer-paper-hint span { color: #805660; }
.explorer-paper { overflow: auto; max-height: 70vh; background: #fff1f2; }
.explorer-canvas { min-width: 720px; }
.explorer-canvas .ecg-svg { width: 100%; height: auto; max-height: none !important; display: block; }
.explorer-caption { margin: 0; padding: 10px 14px; color: #805660; font-size: .7rem; line-height: 1.5; }
.explorer-findings { padding: 20px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; min-width: 0; }
.explorer-findings h2 { margin: 6px 0 12px; color: var(--ink); font-size: 1.2rem; line-height: 1.4; }
.explorer-findings > p:not(.explorer-kicker) { color: var(--ink-soft); font-size: .85rem; line-height: 1.65; }
.explorer-findings h3 { font-size: .8rem; margin: 24px 0 12px; }
.explorer-findings h3 span { font-size: .72rem; color: var(--ink-soft); margin-left: 6px; }
.explorer-finding-list { display: grid; gap: 6px; max-height: 265px; overflow: auto; padding: 2px; }
.explorer-finding-list button { display: flex; align-items: baseline; gap: 9px; min-height: 44px; padding: 9px; border: 1px solid transparent; background: transparent; color: var(--ink); border-radius: 8px; text-align: left; font: inherit; font-size: .79rem; cursor: pointer; line-height: 1.45; }
.explorer-finding-list button > span { color: var(--ink-soft); font-size: .65rem; }
.explorer-finding-list button[aria-pressed="true"] { background: var(--ov-job-bg); border-color: var(--brand-2); }
.explorer-explanation { margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--line); font-size: .83rem; line-height: 1.65; }
.explorer-explanation p { color: var(--ink-soft); margin: 8px 0 12px; }
.explorer-guide-link { display: inline-block; margin-top: 18px; font-size: .78rem; }
.explorer-answer { display: grid; gap: 8px; font-size: .8rem; margin: 16px 0; }
.explorer-answer textarea { width: 100%; resize: vertical; min-height: 90px; border: 1px solid var(--line); border-radius: 8px; padding: 10px; font: inherit; color: var(--ink); background: var(--card); }
.ecg-explorer :focus-visible, .explorer-dialog :focus-visible { outline: 3px solid var(--brand-2); outline-offset: 2px; }
.explorer-dialog { width: calc(100vw - 32px); max-width: 1600px; max-height: calc(100dvh - 32px); padding: 24px; border: 1px solid var(--line); border-radius: 18px; background: var(--bg); color: var(--ink); overflow: auto; }
.explorer-dialog::backdrop { background: rgba(15,30,27,.72); -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px); }
.explorer-dialog .explorer-heading { position: sticky; top: -24px; background: var(--bg); padding-block: 12px; z-index: 2; }
.explorer-dialog .explorer-paper { max-height: 70dvh; }
@media (max-width: 1100px) { .explorer-layout { grid-template-columns: minmax(0,1fr); } .explorer-findings { order: 0; } .explorer-finding-list { display: flex; flex-wrap: wrap; max-height: 150px; } .explorer-findings h3 { margin-top: 12px; } }
@media (max-width: 700px) {
  .topbar > .primary-nav { grid-template-columns: repeat(5,minmax(0,1fr)); }
  .primary-nav #explorerBtn { width: 100%; justify-content: center; padding-inline: 3px; font-size: .75rem; }
  .primary-nav .ui-icon { display: block; width: 18px; height: 18px; }
  .explorer-heading { align-items: start; flex-direction: column; gap: 12px; margin-bottom: 16px; }
  .explorer-controls { padding: 12px; gap: 8px; }
  .explorer-controls label:first-child { flex-basis: 100%; min-width: 0; }
  .explorer-findings { padding: 16px; }
  .explorer-dialog { width: calc(100vw - 8px); max-height: calc(100dvh - 8px); padding: 12px; border-radius: 12px; }
  .explorer-dialog .explorer-heading { top: -12px; }
  .explorer-dialog .explorer-heading h1 { font-size: 1.3rem; }
  .explorer-dialog .explorer-heading > div > p { display: none; }
  .explorer-dialog .explorer-heading { flex-direction: row; align-items: center; }
}
@media print { .explorer-controls, .explorer-heading > button, .explorer-finding-list, .explorer-explanation button { display: none; } .explorer-layout { display: block; } .explorer-canvas { min-width: 0; width: 100% !important; } .explorer-paper { max-height: none; overflow: visible; } .explorer-dialog { display: none; } .ecg-media { background: #fff1f2 !important; } }

.explorer-explanation { border-top: 0; border-left: 3px solid #dc2626; border-radius: 0 8px 8px 0; padding: 12px; background: var(--ov-job-bg); }

.explorer-clinical-stem { padding: 16px; border-left: 4px solid var(--accent, #187469); background: var(--card); border-radius: 8px; }
.explorer-source { font-size: .78rem; line-height: 1.5; margin-top: 16px; }

/* Student reading and practice. A single hierarchy across learning tools. */
[hidden] { display: none !important; }
.student-intro { padding: 20px; margin: 16px 0 24px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; }
.student-start { padding: 20px; margin: 16px 0 24px; background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: 12px; box-shadow: var(--shadow-sm); }
.student-start h2 { font-size: 1.25rem; margin: 6px 0 10px; }
.student-actions, .confidence-buttons { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin: 12px 0; }
.student-actions a, .confidence button, .study-actions button, #saveNote { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 10px 14px; border: 1px solid var(--line); border-radius: 8px; background: var(--card); color: var(--ink); text-decoration: none; font: inherit; font-size: .9rem; cursor: pointer; transition: border-color 0.15s ease, background 0.15s ease; }
.student-actions a:hover { border-color: var(--accent); }
.student-actions a:first-child { border-color: var(--brand-2); font-weight: 600; }
.confidence button[aria-pressed="true"] { background: var(--ov-job-bg); border-color: var(--brand-2); }
.confidence-status, .explorer-source { color: var(--ink-soft); font-size: .85rem; }
.student-glossary { margin-top: 12px; }
.student-glossary summary { cursor: pointer; padding: 10px 0; font-weight: 600; }
.student-glossary dl { display: grid; grid-template-columns: repeat(auto-fit,minmax(220px,1fr)); gap: 12px; }
.student-glossary dt { font-weight: 700; }.student-glossary dd { margin: 4px 0 0; }
.case-practice > label { display: grid; gap: 8px; margin: 12px 0; }.case-practice select { max-width: 100%; min-height: 44px; padding: 10px; background: var(--card); color: var(--ink); border: 1px solid var(--line); border-radius: 8px; font: inherit; }
.quiz-feedback:not(:empty) { padding: 16px; margin-top: 12px; background: var(--ov-job-bg); border-radius: 8px; line-height: 1.65; }.quiz-feedback summary { cursor: pointer; padding: 10px 0; }.quiz-feedback p { margin: 8px 0; }
.case-complete { margin: 20px 0; padding: 20px; border: 1px solid var(--brand-2); border-radius: 12px; }
.context-filters { position: relative; }.context-filters > summary { cursor: pointer; padding: 12px; font-size: .85rem; }.context-filters .chips { position: absolute; right: 0; top: 100%; z-index: 40; padding: 12px; width: 260px; flex-wrap: wrap; background: var(--card); border: 1px solid var(--line); border-radius: 10px; box-shadow: 0 8px 24px #0002; }
.theme-details { padding: 12px; }.theme-details summary { cursor: pointer; }.theme-details .accent-tools { padding-top: 16px; }
.dx-card .sev-dot { display: none; }.dx-card { border-left-width: 1px; }.dx-card h4 { color: var(--ink); }.dx-card .sev-tag { background: transparent; color: var(--ink-soft); border: 1px solid var(--line); font-size: .7rem; }
.dx-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }.dx-key, .cluster p, .ov-prose { font-size: .96rem; line-height: 1.7; }.ov-prose { max-width: 75ch; }
.explorer-canvas { min-width: 0; }.explorer-detail { margin: 0 0 14px; }.explorer-detail > p { font-size: .78rem; margin: 0 0 8px; }.explorer-detail svg { display: block; width: 100%; height: 180px; max-height: 180px !important; background: #fff1f2; border: 1px solid #d98a92; border-radius: 6px; }
.explorer-explanation { scroll-margin-top: 130px; }.explorer-finding-list { max-height: none; overflow: visible; }.explorer-confidence { margin-top: 20px; border-top: 1px solid var(--line); padding-top: 12px; }
.disclaimer-modal { display: flex; flex-direction: column; max-height: calc(100dvh - 24px); overflow: hidden; }.disclaimer-header, .disclaimer-footer { flex-shrink: 0; }.disclaimer-body { overflow-y: auto; min-height: 0; }.disclaimer-footer { background: var(--card); border-top: 1px solid var(--line); padding: 14px 20px; }
@media(max-width:1100px){.explorer-finding-list { display: grid; max-height: none; }.explorer-detail svg { height: 170px; }.explorer-layout { gap: 14px; }}
@media(max-width:700px){
 .primary-nav { grid-template-columns: repeat(5,minmax(0,1fr)); }.primary-nav .header-label { font-size: .69rem; white-space: normal; line-height: 1.2; }.primary-nav button { min-height: 44px; padding: 6px 3px; }
 .context-filters { grid-row: 1; grid-column: 3; }.context-filters summary { padding: 10px 4px; font-size: .7rem; }.context-filters .chips { right: -36px; }
 .student-intro, .student-start { padding: 16px; }.student-actions a { flex: 1 1 100%; }.dx-grid { grid-template-columns: 1fr; }
 .explorer-heading { margin-bottom: 10px; gap: 8px; }.explorer-heading h1 { font-size: 1.45rem; }.explorer-heading .explorer-kicker, .explorer-heading > div > p:last-child { display: none; }.explorer-heading .ex-button { min-height: 38px; padding: 8px 12px; }.explorer-controls { padding: 10px; margin-bottom: 10px; gap: 6px; }.explorer-controls .ex-button, .explorer-controls select { min-height: 40px; font-size: .8rem; padding: 8px; }.explorer-controls label:first-child { flex-basis: 100%; }.explorer-paper-hint { padding: 8px 10px; }.explorer-paper-hint span { display: none; }.explorer-caption { font-size: .76rem; line-height: 1.5; }
 .disclaimer-header { padding: 14px 18px; }.disclaimer-header h2 { font-size: 1.1rem; }.disclaimer-badge { display: none; }.disclaimer-body { padding: 12px 18px; }.disclaimer-footer { padding: 12px 18px; }
}
.context-filters { grid-column: auto; grid-row: auto; }.student-intro .context-filters .chips { left: 0; right: auto; }.student-safety { padding: 12px 16px; border-left: 3px solid var(--brand-2); background: var(--card); line-height: 1.6; }.reference-firstpass { margin-bottom: 20px; }.reference-firstpass > summary { padding: 12px 0; cursor: pointer; font-weight: 600; }
@media(max-width:700px){.home-intro { padding-top: 10px; padding-bottom: 10px; }.home-intro h1 { font-size: 1.7rem; }.student-start { margin-top: 10px; }.context-filters summary { font-size: .85rem; }}
.explorer-options { position: relative; min-width: 120px; }.explorer-options summary { cursor: pointer; padding: 12px; font-size: .85rem; }.explorer-options[open] { padding: 8px; border: 1px solid var(--line); border-radius: 8px; }.explorer-options label { margin: 6px 0; }.weak-areas summary { padding: 12px 0; cursor: pointer; font-weight: 600; }.weak-areas li { margin: 10px 0; }
@media(max-width:700px){.explorer-heading { flex-direction: row; align-items: center; }.explorer-controls { align-items: center; }.explorer-options { min-width: 0; }.explorer-options summary { padding: 10px 6px; }.explorer-heading .ex-button { font-size: .76rem; }.explorer-controls label:first-child { flex-basis: 100%; }.explorer-options label:first-child { min-width: 130px; }}
html[data-theme="light"][data-accent] { --side-sub: #647181; --side-note: #647181; }
.ecg-workbench-tools button[aria-pressed="true"] { background: var(--brand-2); color: var(--on-fill); }

/* Theme-safe states and intrinsic sizing on narrow screens. */
.quiz-question { min-inline-size: 0; }
.quiz-options, .quiz-option { min-width: 0; overflow-wrap: anywhere; }
.ecg-filters .chip.active { background: var(--brand-2); color: var(--on-fill); }
.dx-card:is(.sev-critical,.sev-emergent,.sev-common) h4 { color: var(--ink); }
.dx-card:is(.sev-critical,.sev-emergent,.sev-common) .sev-tag { background: transparent; color: var(--ink-soft); }
.group-title span { color: var(--ink); }
html[data-theme="light"] .ecg-pattern.sev-emergent h4 { color: #9a3412; }
html[data-theme="light"] .ecg-pattern.sev-critical h4 { color: #b91c1c; }
html[data-theme="light"] .disp-col.d-discharge h4,
html[data-theme="light"] .quiz-option.correct { color: #166534; }
html[data-theme="light"] .quiz-option.incorrect { color: #b91c1c; }
.case-practice > label { grid-template-columns: minmax(0,1fr); min-width: 0; }
.case-practice select { width: 100%; min-width: 0; }

.study-tabs button span { color: var(--ink); }
html[data-theme="light"] .disp-col.d-admit h4 { color: #9a3412; }
html[data-theme="light"] .disp-col.d-icu h4 { color: #b91c1c; }

/* Keep all five navigation icons and labels visible on phones. */
@media (max-width: 700px) {
  .topbar { grid-template-rows: minmax(44px,auto) minmax(64px,auto); row-gap: 12px; align-items: stretch; }
  .topbar > .primary-nav > :is(#homeBtn,#studyBtn,#shiftBtn,#ecgBtn,#explorerBtn) {
    padding: 4px 2px;
    font-size: min(.69rem,12px);
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    height: auto;
    min-height: 64px;
    min-width: 0;
  }
  .topbar > .primary-nav > :is(#homeBtn,#studyBtn,#shiftBtn,#ecgBtn,#explorerBtn) .header-label {
    width: 100%;
    white-space: normal;
    overflow-wrap: anywhere;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 2.4em;
    line-height: 1.2;
    text-align: center;
  }
}

@media (min-width: 701px) and (max-width: 920px) {
  .topbar { grid-template-rows: minmax(44px,auto) minmax(44px,auto); row-gap: 12px; }
}

/* Use two rows before the desktop search and navigation become crowded. */
@media (min-width: 921px) and (max-width: 1160px) {
  .topbar { grid-template-columns: minmax(0,1fr) 44px; grid-template-rows: auto auto; row-gap: 12px; }
  .topbar > .searchwrap { grid-column: 1; grid-row: 1; max-width: none; }
  .topbar > .tools-toggle { grid-column: 2; grid-row: 1; }
  .topbar > .primary-nav { grid-column: 1 / -1; grid-row: 2; justify-content: space-between; }
  .topbar > .primary-nav > :is(#homeBtn,#studyBtn,#shiftBtn,#ecgBtn,#explorerBtn) { width: auto; padding: 8px; min-height: 44px; height: auto; }
  .topbar > .primary-nav > :is(#homeBtn,#studyBtn,#shiftBtn,#ecgBtn,#explorerBtn) .header-label { display: inline; }
}

/* ECG learning workspace: readable paper, connected feedback and restrained motion. */
.ecg-hero { padding-block: 22px; }
.ecg-fig { border-color: var(--line); box-shadow: 0 3px 16px rgba(20,60,50,.04); }
.ecg-fig .ecg-toolbar { padding: 10px 12px; }
.ecg-fig .ecg-inspector { line-height: 1.65; }
.explorer-heading { margin-bottom: 16px; }
.explorer-heading h1 { letter-spacing: -.035em; }
.explorer-heading > div > p:last-child { max-width: 55ch; }
.explorer-progress { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; padding: 14px 18px; margin-bottom: 14px; background: var(--ov-job-bg); border: 1px solid var(--line); border-radius: 14px; }
.explorer-progress > div { flex: 1; min-width: 160px; display: grid; gap: 6px; }
.explorer-progress strong { font-size: .86rem; }
.explorer-progress small { color: var(--ink-soft); font-size: .73rem; }
.explorer-progress progress { width: min(100%,320px); height: 6px; accent-color: var(--brand); }
.explorer-controls { border: 0; padding: 12px 0; background: transparent; gap: 10px; }
.explorer-layout { grid-template-columns: minmax(0,1fr) 320px; gap: 20px; }
.explorer-findings { max-height: calc(100dvh - 110px); overflow: auto; position: sticky; top: 95px; padding: 18px; }
.explorer-findings h2 { font-size: 1.12rem; }
.explorer-explanation { background: var(--ov-job-bg); margin: 16px 0; }
.explorer-detail svg { height: 195px; max-height: 195px !important; }
.explorer-finding-list button { transition: background .16s ease, border-color .16s ease; }
.explorer-finding-list button:hover { background: var(--ov-job-bg); }
.explorer-learning-actions { display: flex; flex-wrap: wrap; gap: 8px; padding-top: 16px; margin-top: 16px; border-top: 1px solid var(--line); }
.explorer-learning-actions .ex-button { flex: 1 1 140px; font-size: .77rem; }
.explorer-learning-actions [aria-pressed="true"] { color: var(--on-fill); background: var(--brand); }
.explorer-layout.has-comparison { grid-template-columns: minmax(0,1fr) minmax(0,1fr) 300px; }
.explorer-comparison { min-width: 0; padding: 12px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; }
.explorer-comparison h3 { margin: 0 0 8px; font-size: 1rem; }
.explorer-comparison p { font-size: .78rem; line-height: 1.6; color: var(--ink-soft); }
.explorer-reference-paper { overflow: auto; background: #fff1f2; border: 1px solid #e9bbc1; border-radius: 6px; }
.explorer-reference-canvas svg { display: block; width: 100%; height: auto; max-height: none !important; }
.explorer-cursor { stroke: #176c9c; stroke-width: 2; vector-effect: non-scaling-stroke; fill: none; pointer-events: none; }
.explorer-location-feedback { min-height: 2em; font-weight: 600; }
.explorer-practice-feedback { padding: 12px; border-radius: 8px; background: var(--ov-job-bg); font-size: .8rem; }
.explorer-explanation, .ecg-inline-marks { animation: ecg-selection-in .18s ease-out; }
@keyframes ecg-selection-in { from { opacity: .4; } to { opacity: 1; } }
@media(max-width:1400px){.explorer-layout.has-comparison { grid-template-columns: minmax(0,1fr) minmax(0,1fr); }.has-comparison .explorer-findings { grid-column: 1 / -1; position: static; max-height: none; }}
@media(max-width:1100px){.explorer-layout { grid-template-columns: minmax(0,1fr); }.explorer-findings { position: static; max-height: none; }.explorer-explanation { scroll-margin-top: 90px; }}
@media(max-width:700px){.explorer-layout.has-comparison { grid-template-columns: minmax(0,1fr); }.explorer-progress { padding: 12px; gap: 8px; }.explorer-progress .ex-button { flex: 1; font-size: .78rem; }.explorer-progress > div { flex-basis: 100%; }.explorer-controls { padding-block: 8px; }.explorer-detail svg { height: 175px; }.explorer-comparison { padding: 10px; }.ecg-hero { padding-block: 18px; }}
@media(prefers-reduced-motion:reduce){.explorer-explanation,.ecg-inline-marks { animation: none; }.explorer-finding-list button { transition: none; }}
@media print {.explorer-progress,.explorer-learning-actions,.explorer-cursor { display: none; }.explorer-findings { position: static; max-height: none; overflow: visible; }}
/* Keep the overview above the fold; comparison papers share equal column widths. */
.explorer-heading h1 { font-size: 1.8rem; margin-block: 4px; }
.explorer-heading .explorer-kicker { margin-bottom: 4px; }
.explorer-heading > div > p:last-child { margin-block: 6px; font-size: .86rem; }
.explorer-progress { padding: 10px 14px; margin-bottom: 8px; }
.explorer-progress > div { grid-template-columns: auto minmax(70px,150px); align-items: center; gap: 5px 12px; }
.explorer-progress small { grid-column: 1 / -1; }
.explorer-comparison { padding: 0; overflow: hidden; }
.explorer-comparison h3,.explorer-comparison > p { padding-inline: 14px; }
.explorer-comparison h3 { padding-top: 12px; }
.explorer-reference-paper { border-inline: 0; border-radius: 0; }
@media(max-width:700px){.explorer-heading h1 { font-size: 1.4rem; }.explorer-progress > div { grid-template-columns: auto minmax(60px,1fr); }.explorer-progress strong { font-size: .78rem; }}
.main .stage:has(> .ecg-explorer) { max-width: 1600px; padding: 20px 24px 36px; }
.explorer-heading { margin-block: 0 12px; }
.explorer-heading .explorer-kicker { display: none; }
.explorer-heading h1 { font-size: 1.6rem; }
.explorer-progress > div { grid-template-columns: max-content minmax(70px,150px); justify-content: start; }
.explorer-controls { margin-bottom: 12px; }
@media(max-width:700px){.main .stage:has(> .ecg-explorer) { padding: 14px 10px 24px; }.explorer-progress > div { grid-template-columns: auto minmax(50px,1fr); justify-content: stretch; }}
@media(min-width:1101px){.explorer-findings .explorer-explanation { position: sticky; top: 0; z-index: 1; background: var(--card); box-shadow: 0 5px 12px rgba(20,60,50,.05); }.has-comparison .explorer-findings .explorer-explanation { position: static; }}
.explorer-sheet > .explorer-explanation { margin: 0; padding: 14px; background: var(--card); border-left: 3px solid var(--brand); border-radius: 0; }
.explorer-sheet { scroll-margin-top: 90px; }
.has-comparison .explorer-paper-hint { min-height: 44px; align-items: center; }

/* ── Fixed headers: brand + footer pinned, presentation list scrolls ──
   Rollback: delete this block to restore whole-sidebar scrolling. */
.sidebar { overflow: hidden; }
.sidebar > .brand { flex: none; }
.sidebar > .side-list {
    flex: 1 1 auto;
    min-height: 0;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--side-scroll) transparent;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    padding-bottom: 8px;
}
.side-list::-webkit-scrollbar { width: 4px; }
.side-list::-webkit-scrollbar-thumb { background: var(--side-scroll); border-radius: var(--radius-full); }
.sidebar > .side-footer { flex: none; }
/* ── Sidebar content: counts + feedback link ── */
.side-count {
    display: inline-block;
    font-size: .66rem;
    font-weight: 700;
    line-height: 1;
    padding: 3px 8px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.12);
    color: var(--side-muted);
    white-space: nowrap;
}
.side-item .side-count { margin-left: auto; }
.side-group .side-count { margin-left: 6px; vertical-align: 1px; }
a.side-btn { text-decoration: none; }
.foot a { color: var(--brand-2); }
/* Topbar stays pinned on scroll (reinforces base sticky rule across overrides). */
.topbar { position: -webkit-sticky; position: sticky; top: 0; }

/* ── Collapsible sidebar: toggle from topbar (desktop) or side-head (drawer) ──
   State lives on <html class="sidebar-collapsed">, persisted in em-cps-prefs.
   Rollback: delete from here to the end of this block. */
.side-head { display: flex; align-items: center; gap: 8px; }
.side-head .brand { flex: 1 1 auto; min-width: 0; padding-bottom: 18px; }
.collapse-btn {
    flex: none;
    width: 44px;
    min-width: 44px;
    height: 44px;
    margin-bottom: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    background: rgba(255, 255, 255, 0.07);
    color: var(--side-muted);
    cursor: pointer;
}
.collapse-btn:hover { background: rgba(255, 255, 255, 0.15); color: #ffffff; }
.collapse-btn .ui-icon { width: 19px; height: 19px; display: block; }
@media (min-width: 921px) {
  .sidebar { transition: transform var(--transition-smooth) var(--ease-out), visibility 0s; }
  html.sidebar-collapsed .sidebar { -webkit-transform: translateX(-105%); transform: translateX(-105%); box-shadow: none; visibility: hidden; transition: transform var(--transition-smooth) var(--ease-out), visibility 0s .3s; }
  html.sidebar-collapsed .main { margin-left: 0; }
}
.has-comparison .explorer-paper-hint span { display: none; }

/* ECG learning flow: optional guidance, one page scroll, and controls near the tracing. */
.explorer-path { margin-bottom: 12px; border: 1px solid var(--line); border-radius: 12px; background: var(--card); padding: 12px 16px; }
.explorer-path summary, .explorer-checklist summary { cursor: pointer; font-size: .88rem; font-weight: 650; min-height: 28px; }
.explorer-path summary span { display: inline-block; margin-left: 8px; color: var(--ink-soft); font-size: .76rem; font-weight: 400; }
.explorer-path > p, .explorer-path li p, .explorer-path-current, .explorer-practice-status, .explorer-checklist > p, .explorer-hint p { font-size: .82rem; line-height: 1.6; color: var(--ink-soft); }
.explorer-path ol { display: grid; grid-template-columns: repeat(auto-fit,minmax(220px,1fr)); gap: 12px; padding: 0; list-style-position: inside; }
.explorer-path li { padding: 14px; border: 1px solid var(--line); border-radius: 10px; min-width: 0; }
.explorer-path li strong { font-size: .88rem; }.explorer-path li p { margin-block: 8px; }
.explorer-path li small { display: block; font-size: .73rem; line-height: 1.5; color: var(--ink-soft); }
.explorer-path li .ex-button { margin-top: 12px; width: 100%; }
.explorer-path-current { border-left: 3px solid var(--brand); padding: 10px 14px; background: var(--card); border-radius: 8px; }
.explorer-path-current .ex-button { margin: 8px 0 0 10px; }
.explorer-controls { scroll-margin-top: 150px; }
.explorer-findings { position: static; max-height: none; overflow: visible; }
.explorer-findings .explorer-explanation { position: static; box-shadow: none; }
.explorer-finding-nav { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-top: 16px; }
.explorer-finding-nav .ex-button { font-size: .78rem; padding-inline: 9px; }.explorer-finding-nav span { white-space: nowrap; color: var(--ink-soft); font-size: .75rem; }
.explorer-checklist { border: 1px solid var(--line); padding: 12px; border-radius: 10px; margin-block: 14px; }
.explorer-checklist label { display: grid; gap: 6px; font-size: .8rem; margin-block: 12px; }
.explorer-checklist textarea { box-sizing: border-box; width: 100%; min-width: 0; resize: vertical; padding: 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--card); color: var(--ink); font: inherit; line-height: 1.5; }
.explorer-hint { margin-block: 14px; }.explorer-hint p { padding: 10px; background: var(--ov-job-bg); border-radius: 8px; }
.explorer-whole { min-height: 44px; font-size: .78rem; padding: 8px 12px; }
.explorer-canvas .ecg-finding-marks [data-region] { pointer-events: all; cursor: pointer; }
.explorer-canvas .ecg-finding-marks [data-region]:focus-visible { outline: none; stroke: var(--brand); stroke-width: 4; fill: rgba(20,100,80,.12); }
@media(max-width:700px){.explorer-path { padding: 12px; }.explorer-path summary span { display: block; margin: 6px 0 0; }.explorer-path ol { grid-template-columns: minmax(0,1fr); }.explorer-path-current .ex-button { display: block; margin-left: 0; }.explorer-findings { padding: 14px; }}
@media print{.explorer-path,.explorer-path-current,.explorer-finding-nav,.explorer-hint,.explorer-whole { display: none; }}
.explorer-canvas .ecg-finding-marks [aria-pressed="true"] { stroke-width: 4; fill: rgba(220,38,38,.09); }
.explorer-finding-chooser { margin-top: 12px; border: 1px solid var(--line); border-radius: 8px; padding: 10px; }
.explorer-finding-chooser summary { cursor: pointer; min-height: 28px; font-size: .82rem; font-weight: 600; }
.explorer-finding-chooser .explorer-finding-list { margin-top: 8px; }
.explorer-path summary, .explorer-checklist summary, .explorer-finding-chooser summary { box-sizing: border-box; min-height: 44px; padding-block: 8px; }

/* Optional learning depth: compact disclosure, no hidden clinical sections. */
.guided-reasoning{margin-top:16px;border:1px solid var(--line,#ccd3dc);border-radius:12px;background:var(--card,#fff);color:var(--ink,#172536)}
.guided-reasoning>summary{padding:14px 16px;cursor:pointer;font-weight:700;min-height:44px}
.guided-inner{padding:0 16px 16px}
.guided-levels{display:flex;flex-wrap:wrap;gap:8px;margin:4px 0 14px}
.guided-levels button{font:inherit;min-height:44px;padding:8px 16px;border:1px solid currentColor;border-radius:8px;background:transparent;color:inherit;cursor:pointer}
.guided-levels button[aria-pressed="true"]{background:var(--ink,#172536);color:var(--card,#fff)}
.guided-prompts{padding-left:24px;margin:12px 0}
.guided-prompts li{padding:8px 0 12px}
.guided-prompts li p{margin:0 0 6px}
.guided-prompts a{display:inline-block;padding:8px 0;text-underline-offset:3px}
.guided-footnote,.guided-save{font-size:.85rem;line-height:1.5}
.guided-save:empty{display:none}
.guided-reasoning :focus-visible{outline:3px solid var(--accent,#2563eb);outline-offset:3px}

/* Learning workspace: shared layouts for cases, visual interpretation and team preparation. */
.workspace-entry,.workspace-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr));gap:16px;margin:24px 0}
.workspace-entry>a,.workspace-card{display:flex;flex-direction:column;justify-content:space-between;padding:22px;border:1px solid var(--line);border-radius:14px;background:var(--card);color:var(--ink);min-width:0;transition:transform .15s ease,border-color .15s ease,box-shadow .15s ease}
.workspace-entry>a{text-decoration:none}
.workspace-entry>a:hover,.workspace-card[href]:hover{transform:translateY(-2px);border-color:var(--accent);box-shadow:var(--shadow-md)}
.workspace-entry span{display:block;color:var(--ink-soft);font-size:.85rem;margin-bottom:10px}
.workspace-entry strong{display:block;font-size:1.15rem;line-height:1.35}
.workspace-entry p{margin-top:10px;color:var(--ink-soft);line-height:1.55}
.workspace-entry b{display:inline-flex;align-items:center;gap:4px;margin-top:14px;color:var(--accent);font-size:.9rem;font-weight:600}
.learning-workspace{max-width:1120px;margin:0 auto;color:var(--ink)}
.learning-workspace h1{font-size:clamp(1.8rem,4vw,2.6rem);line-height:1.2;margin:12px 0}
.workspace-lead{color:var(--ink-soft);line-height:1.6;max-width:70ch}
.workspace-tabs{display:flex;flex-wrap:wrap;gap:8px;margin:24px 0;border-bottom:1px solid var(--line);padding-bottom:12px}
.workspace-tabs a,.workspace-actions a,.workspace-actions button,.learning-workspace button,.backup-label{font:inherit;display:inline-flex;align-items:center;min-height:44px;padding:10px 14px;border:1px solid var(--line);border-radius:9px;color:var(--ink);background:var(--card);text-decoration:none;cursor:pointer}
.workspace-tabs a[aria-current="page"],.learning-workspace .workspace-primary{background:var(--ink);color:var(--card);border-color:var(--ink)}
.workspace-body h2{font-size:1.35rem;line-height:1.4;margin:0 0 12px}
.workspace-body h3{font-size:1.05rem;line-height:1.4;margin:10px 0}
.workspace-body p{line-height:1.65;margin:10px 0}
.workspace-body ul,.workspace-body ol{padding-left:24px}
.workspace-body li{line-height:1.6;margin:10px 0}
.workspace-card[href]{text-decoration:none}
.workspace-card>span:last-child{display:block;margin-top:16px;text-decoration:underline;text-underline-offset:4px}
.workspace-actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:18px 0}
.workspace-callout,.case-update,.workspace-feedback,.workspace-result{border:1px solid var(--line);border-radius:12px;padding:20px;background:var(--card);margin:20px 0}
.workspace-feedback{border-inline-start:4px solid var(--accent)}
.workspace-step,.workspace-media-label{font-size:.82rem;font-weight:700;color:var(--ink-soft)}
.learning-workspace .quiz-options{display:grid;gap:10px;margin:16px 0}
.learning-workspace .quiz-option{text-align:left;line-height:1.5;white-space:normal;width:100%}
.learning-workspace .quiz-option:disabled{opacity:1;cursor:default}
.learning-workspace summary,.reassessment-guide summary{cursor:pointer;min-height:44px;padding:10px 0;font-weight:650}
.workspace-source{margin-top:24px;border-top:1px solid var(--line);padding-top:8px;font-size:.88rem;overflow-wrap:anywhere}
.workspace-source p{color:var(--ink-soft)}
.workspace-source a,.workspace-body a:not(.workspace-card):not(.workspace-tabs a){text-underline-offset:4px}
.workspace-card svg{display:block;width:100%;height:auto;margin:16px 0}
.workspace-card figcaption{font-size:.92rem;line-height:1.5}
.workspace-ecg svg{background:#fff4f5}
.gas-values>div{display:flex;justify-content:space-between;gap:16px;padding:12px 0;border-bottom:1px solid var(--line)}
.gas-values dd{font-weight:700}
.learning-workspace select{font:inherit;display:block;max-width:100%;width:100%;padding:12px;margin:12px 0;background:var(--card);color:var(--ink);border:1px solid var(--line);border-radius:8px}
.workspace-progress-list{list-style:none;padding:0!important}
.workspace-progress-list li{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;padding:14px 0;border-bottom:1px solid var(--line)}
.workspace-progress-list span{font-size:.85rem;color:var(--ink-soft)}
.backup-label{display:flex;flex-direction:column;align-items:flex-start;gap:10px;max-width:100%}
.backup-label input{max-width:100%;width:100%;font:inherit}
.reassessment-guide{margin-top:18px;border-top:1px solid var(--line);padding-top:8px}
.reassessment-guide ol{padding-left:24px}
.reassessment-guide li{margin:12px 0;line-height:1.6}
.reassessment-guide a{display:inline-block;margin:8px 18px 8px 0;min-height:44px;padding:10px 0}
.learning-workspace :focus-visible,.workspace-entry a:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
@media(max-width:600px){.workspace-card,.workspace-entry>a,.workspace-callout,.workspace-result,.workspace-feedback,.case-update{padding:16px}.workspace-tabs a{flex:1 1 42%;justify-content:center;font-size:.9rem}.learning-workspace .quiz-question{padding:0}.workspace-grid{gap:12px}.study-workspace-links a{flex:1 1 45%}}
@media print{.workspace-tabs,.workspace-actions,.workspace-entry{display:none}.workspace-card,.workspace-callout{break-inside:avoid}.workspace-card svg{max-height:350px}}

/* Compact learning detail pages and accessible recorded-waveform controls. */
.workspace-detail>h1{font-size:1.15rem;margin:8px 0}
.workspace-detail>.workspace-lead,.workspace-detail>.study-kicker{display:none}
.workspace-detail>.workspace-tabs{margin:14px 0 20px}
.workspace-session-note{font-size:.85rem;color:var(--ink-soft)}
.workspace-readiness{border:1px solid var(--line);border-radius:12px;padding:16px;margin:24px 0;min-width:0}
.workspace-readiness legend{font-weight:700;padding:0 8px}
.workspace-readiness label{display:flex;align-items:center;gap:12px;min-height:44px;padding:8px 0;line-height:1.5}
.workspace-readiness input{width:20px;height:20px;flex:none;accent-color:var(--accent)}
.recording-controls{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin:20px 0}
.recording-controls label{font-weight:600}
.recording-scroll{max-width:100%;overflow-x:auto;border:1px solid var(--line);border-radius:10px;background:#fffafa}
.recording-scroll svg{display:block;width:100%;min-width:500px;height:auto}
.guided-examples{margin:16px 0;border-top:1px solid var(--line)}
.guided-examples summary{min-height:44px;padding-block:12px;cursor:pointer}
@media(max-width:600px){.learning-workspace>.study-kicker{display:none}.learning-workspace h1{font-size:1.6rem}.workspace-detail h1{font-size:1rem}.workspace-tabs{margin:16px 0}.recording-controls{grid-template-columns:1fr 1fr}.recording-controls label:first-child{grid-column:1/-1}}
/* Count badges retain the new shape with stronger text contrast. */
.cp-grid .cp-card .cp-count{color:var(--ink)}
.learning-workspace #caseFilter{max-width:420px}
.learning-workspace h1:focus,.learning-workspace h2:focus,.workspace-feedback h3:focus{outline:none}
@media(max-width:360px){.topbar>.primary-nav{grid-template-columns:1fr 1fr 1.3fr 1fr 1.2fr}}

/* ══════════════════════════════════════════════════════════════════
   Clinical priority hierarchy
   Every section card used to render at one identical weight, so a
   clinician under time pressure had to read each heading to find the
   actionable ones. Each card already carries a stable `data-section`
   key, so priority is expressed here in CSS alone — no markup, script
   or behaviour change, and no effect on which sections start open.

   Tier 1  dont-miss, red-flags ....... act now  (critical rail + tint)
   Tier 2  how-to-think .............. frame it  (brand rail + tint)
   Tier 3  references, ecg-related ... look it up (quiet, recedes)
   Tier 4  everything else ............ neutral working set
   ══════════════════════════════════════════════════════════════════ */
.section-card {
    --tier: var(--line);
    --tier-w: 3px;
}
.section-card[data-section="dont-miss"],
.section-card[data-section="red-flags"] {
    --tier: var(--critical);
    --tier-w: 5px;
}
.section-card[data-section="how-to-think"] {
    --tier: var(--accent);
    --tier-w: 4px;
}
.section-card[data-section="references"],
.section-card[data-section="ecg-related"] {
    --tier: var(--line-subtle);
    --tier-w: 2px;
}

/* Rail is drawn inside the head so existing padding and the card's
   overflow:hidden keep rounding it at the corners. */
.sec-head { position: relative; }
.sec-head::before {
    content: "";
    position: absolute;
    inset-block: 0;
    inset-inline-start: 0;
    width: var(--tier-w);
    background: var(--tier);
}

/* Act-now sections read first even when collapsed or hovered. */
.section-card[data-section="dont-miss"] .sec-head,
.section-card[data-section="red-flags"] .sec-head {
    background: var(--critical-bg);
}
.section-card[data-section="dont-miss"] .sec-head:hover,
.section-card[data-section="red-flags"] .sec-head:hover { background: var(--critical-bg); }
.section-card[data-section="how-to-think"] .sec-head {
    background: var(--accent-light);
}
.section-card[data-section="how-to-think"] .sec-head:hover { background: var(--accent-light); }

/* Tier 1 titles carry more weight than the working set. */
.sec-head > span:not(.sec-ico):not(.arrow) { letter-spacing: -.01em; }
.section-card[data-section="dont-miss"] .sec-head > span:not(.sec-ico):not(.arrow),
.section-card[data-section="red-flags"] .sec-head > span:not(.sec-ico):not(.arrow) {
    font-size: 1.04rem;
    font-weight: 700;
}

/* Disclosure control reads as a control, not a stray glyph. */
.sec-head .arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: none;
    width: 24px;
    height: 24px;
    border-radius: 7px;
    background: var(--line-subtle);
    color: var(--ink-soft);
    font-size: .55rem;
    opacity: 1;
}
.sec-head:hover .arrow { background: var(--hover-line); }

/* Lookup tier recedes so it never competes with clinical guidance. */
.section-card[data-section="references"] .sec-head,
.section-card[data-section="ecg-related"] .sec-head { color: var(--ink-soft); }
.section-card[data-section="references"] .sec-head > span:not(.sec-ico):not(.arrow) { font-weight: 550; }

/* ── "First 5 minutes" reads as the entry point ──────────────────
   The rail already carried an accent edge but sat at the same optical
   weight as the cards around it. It is the one block a clinician should
   land on first, so it gets a tinted field, a numbered run and a step
   counter instead of a bare digit. */
.case-rail {
    border-left-width: 4px;
    padding: 22px 26px;
    background: linear-gradient(100deg, var(--ov-job-bg) 0%, var(--card) 62%);
}
.case-rail-title { align-items: center; margin-bottom: 14px; }
.case-rail-title strong { font-size: 1.02rem; font-weight: 700; letter-spacing: -.01em; }
.case-rail-title > span {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: rgba(var(--accent-rgb), 0.18);
}
.case-steps { gap: 10px; }
.case-steps li {
    display: grid;
    grid-template-columns: 26px minmax(0, 1fr);
    align-items: start;
    gap: 0 12px;
    padding: 9px 12px;
    border-radius: 9px;
    background: var(--card);
    border: 1px solid var(--line-subtle);
}
.case-steps li > span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: rgba(var(--accent-rgb), 0.16);
    color: var(--brand-2);
    font-size: .74rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}
@media (max-width: 600px) {
    .case-rail { padding: 18px; }
    .case-steps li { padding: 8px 10px; gap: 0 10px; }
}

/* ── Reading progress ────────────────────────────────────────────
   A presentation runs to ten or more collapsible sections. This is a
   passive position cue only: aria-hidden, no pointer events, and it
   never intercepts a click on the content beneath it. */
.read-progress {
    pointer-events: none;
    position: sticky;
    top: var(--topbar-h, 0px);
    z-index: 6;
    height: 3px;
    margin-bottom: 14px;
    border-radius: 9999px;
    background: var(--line-subtle);
    overflow: hidden;
}
.read-progress > i {
    display: block;
    height: 100%;
    width: 0;
    border-radius: inherit;
    background: linear-gradient(90deg, var(--accent) 0%, var(--accent-2) 100%);
    transition: width var(--transition-fast) linear;
}
@media (prefers-reduced-motion: reduce) {
    .read-progress > i { transition: none; }
}
@media print {
    .read-progress { display: none !important; }
}

/* ══════════════════════════════════════════════════════════════════
   Wide-screen presentation shell
   A presentation is a long single column: approach, don't-miss, red
   flags, history, exam, workup, disposition, pearls, notes, related,
   references. The horizontal chip row gave a map but scrolled away
   within a screen of reading, so on a wide viewport the map is pinned
   beside the content and follows the reader.

   Narrow viewports keep the original single column and the original
   chip row untouched — the rail is simply not rendered into view.
   ══════════════════════════════════════════════════════════════════ */
.main .stage:has(> .pres-layout) { max-width: 1180px; }

.pres-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0 24px;
    align-items: start;
}
.pres-rail-wrap { display: none; }
.pres-main { min-width: 0; }

@media (min-width: 960px) {
    .pres-layout { grid-template-columns: 214px minmax(0, 1fr); }
    .pres-rail-wrap {
        display: block;
        position: sticky;
        top: calc(var(--topbar-h, 72px) + 16px);
        max-height: calc(100vh - var(--topbar-h, 72px) - 32px);
        overflow-y: auto;
        overscroll-behavior: contain;
        padding-inline-end: 4px;
    }
    /* The chip row is redundant once the rail is on screen. */
    .pres-main > .presentation-toc { display: none; }
}

.pres-rail {
    display: flex;
    flex-direction: column;
    gap: 1px;
    padding: 4px 0 8px;
}
.pres-rail-label {
    font-size: .67rem;
    font-weight: 700;
    letter-spacing: .09em;
    text-transform: uppercase;
    color: var(--ink-soft);
    padding: 0 10px 10px;
    border-bottom: 1px solid var(--line-subtle);
    margin-bottom: 7px;
}
.rail-jump {
    display: flex;
    align-items: center;
    gap: 9px;
    width: 100%;
    min-height: 34px;
    padding: 6px 10px;
    border: 0;
    border-radius: 8px;
    background: transparent;
    color: var(--ink-soft);
    font: inherit;
    font-size: .82rem;
    font-weight: 500;
    text-align: start;
    line-height: 1.35;
    cursor: pointer;
    transition: background var(--transition-fast) ease, color var(--transition-fast) ease;
}
.rail-jump:hover { background: var(--home-hover); color: var(--ink); }
.rail-dot {
    flex: none;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--line);
    transition: background var(--transition-fast) ease, transform var(--transition-fast) var(--ease-out);
}
.rail-jump.current {
    background: var(--ov-job-bg);
    color: var(--ink);
    font-weight: 650;
}
.rail-jump.current .rail-dot {
    background: var(--accent);
    transform: scale(1.5);
}
.rail-critical { color: var(--ink-soft); }
.rail-critical .rail-dot { background: var(--critical-line); }
.rail-critical.current { color: var(--critical); }
.rail-critical.current .rail-dot { background: var(--critical); }
.rail-jump:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

@media (prefers-reduced-motion: reduce) {
    .rail-jump, .rail-dot { transition: none; }
}
@media print {
    .pres-rail-wrap { display: none !important; }
    .pres-main > .presentation-toc { display: none !important; }
}

/* ── Opening statement ───────────────────────────────────────────
   Every presentation opened as loose text on the page background, so
   the first thing a clinician saw carried no visual anchor. The hero
   is now a tinted panel drawn from the theme accent, which already
   follows the chosen accent theme — so this adds weight without
   inventing a second colour source. */
.cp-hero {
    position: relative;
    margin-bottom: 22px;
    padding: 24px 26px 22px;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background:
        linear-gradient(180deg, rgba(var(--accent-rgb), 0.10) 0%, rgba(var(--accent-rgb), 0.02) 62%, transparent 100%),
        var(--card);
    overflow: hidden;
}
.cp-hero::after {
    content: "";
    position: absolute;
    inset-block-start: 0;
    inset-inline: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent) 0%, var(--accent-2) 100%);
}
.cp-hero h1 {
    font-size: clamp(1.85rem, 3.6vw, 2.6rem);
    line-height: 1.14;
    letter-spacing: -.032em;
    font-weight: 700;
}
.cp-hero .tag {
    font-size: 1rem;
    line-height: 1.6;
    max-width: 62ch;
    margin-top: 8px;
}
.cp-hero .cp-ico-lg {
    width: 62px;
    height: 62px;
    border-radius: 17px;
    margin-bottom: 14px;
}
.cp-hero .cp-ico-lg .color-ico { width: 42px; height: 42px; }
.cp-hero .back-btn { margin-bottom: 12px; }

@media (max-width: 600px) {
    .cp-hero { padding: 20px 18px 18px; border-radius: var(--radius-md); }
    .cp-hero h1 { font-size: 1.7rem; }
    .cp-hero .tag { font-size: .92rem; }
    .cp-hero .cp-ico-lg { width: 52px; height: 52px; border-radius: 14px; }
    .cp-hero .cp-ico-lg .color-ico { width: 34px; height: 34px; }
}

/* ── Home opening statement ──────────────────────────────────────
   Same panel language as the presentation hero so the two screens
   read as one product, and the library below gets a clearer hierarchy:
   the system heading is a labelled rule rather than loose uppercase. */
.home-intro {
    position: relative;
    max-width: none;
    margin-bottom: 26px;
    padding: 26px 28px 24px;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background:
        linear-gradient(180deg, rgba(var(--accent-rgb), 0.10) 0%, rgba(var(--accent-rgb), 0.02) 60%, transparent 100%),
        var(--card);
    overflow: hidden;
}
.home-intro::after {
    content: "";
    position: absolute;
    inset-block-start: 0;
    inset-inline: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent) 0%, var(--accent-2) 100%);
}
.home-intro h1 {
    font-size: clamp(1.95rem, 3.4vw, 2.7rem);
    font-weight: 700;
    max-width: 22ch;
    margin: 10px 0 12px;
}
.home-intro p { max-width: 56ch; font-size: 1rem; }
.home-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 16px;
    margin-top: 18px;
    padding-top: 15px;
    border-top: 1px solid var(--line-subtle);
    font-size: .78rem;
    color: var(--ink-soft);
    font-variant-numeric: tabular-nums;
}

.library-group { margin-top: 30px; }
.group-title {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 13px;
    font-size: .74rem;
    font-weight: 700;
    letter-spacing: .1em;
    color: var(--ink-soft);
}
.group-title::after {
    content: "";
    flex: 1;
    height: 1px;
    background: var(--line);
}
.group-title > span { font-variant-numeric: tabular-nums; color: var(--ink-soft); opacity: .75; }

.cp-grid .cp-card h3 { font-size: 1rem; font-weight: 650; letter-spacing: -.01em; }
.cp-grid .cp-card p { line-height: 1.55; }

@media (max-width: 600px) {
    .home-intro { padding: 20px 18px 18px; border-radius: var(--radius-md); }
    .home-intro h1 { font-size: 1.75rem; }
    .home-intro p { font-size: .92rem; }
}

/* ══════════════════════════════════════════════════════════════════
   Clinical system identity
   The palette for the 17 systems was already defined but spent on a 44px
   icon tile, so every card read as the same grey box with a coloured
   square in it. Each card now carries a wash of its own system hue, and
   the group heading picks up the dominant hue of the systems beneath it.
   The wash is deliberately faint (7% at the top, gone by 70%) so a screen
   of cards reads as calm colour families rather than confetti.
   ══════════════════════════════════════════════════════════════════ */
.cp-grid .cp-card {
    background: linear-gradient(180deg, rgba(var(--cat, 100, 116, 139), 0.075) 0%, var(--card) 68%);
    border-color: color-mix(in srgb, rgb(var(--cat, 100, 116, 139)) 22%, var(--line));
}
.cp-grid .cp-card:hover {
    background: linear-gradient(180deg, rgba(var(--cat, 100, 116, 139), 0.13) 0%, var(--card) 72%);
    border-color: color-mix(in srgb, rgb(var(--cat, 100, 116, 139)) 40%, var(--line));
}
.cp-grid .cp-card .cp-ico {
    box-shadow: 0 2px 8px color-mix(in srgb, rgb(var(--cat, 100, 116, 139)) 22%, transparent);
}
/* Title picks up a trace of the system so scanning a row is faster. */
.cp-grid .cp-card h3 { color: color-mix(in srgb, rgb(var(--cat, 100, 116, 139)) 30%, var(--ink)); }

.home-group { margin-top: 32px; }
.group-title { color: var(--ink); }
.group-title::before {
    content: "";
    flex: none;
    width: 9px;
    height: 9px;
    border-radius: 3px;
    background: rgb(var(--cat, 100, 116, 139));
    transform: rotate(45deg);
}

html[data-theme="dark"] .cp-grid .cp-card {
    background: linear-gradient(180deg, rgba(var(--cat, 100, 116, 139), 0.16) 0%, var(--card) 70%);
    border-color: color-mix(in srgb, rgb(var(--cat, 100, 116, 139)) 26%, var(--line));
}
html[data-theme="dark"] .cp-grid .cp-card:hover {
    background: linear-gradient(180deg, rgba(var(--cat, 100, 116, 139), 0.24) 0%, var(--card) 74%);
    border-color: color-mix(in srgb, rgb(var(--cat, 100, 116, 139)) 44%, var(--line));
}
html[data-theme="dark"] .cp-grid .cp-card h3 { color: color-mix(in srgb, rgb(var(--cat, 100, 116, 139)) 26%, var(--ink)); }

/* The hero and the first-minutes rail take the topic's clinical system hue,
   so one colour identifies a presentation from the library card through to
   the page it opens. */
.cp-hero {
    background:
        linear-gradient(180deg, rgba(var(--cat, 15, 157, 118), 0.13) 0%, rgba(var(--cat, 15, 157, 118), 0.03) 60%, transparent 100%),
        var(--card);
    border-color: color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 24%, var(--line));
}
.cp-hero::after {
    background: linear-gradient(90deg, rgb(var(--cat, 15, 157, 118)) 0%, color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 55%, var(--accent-2)) 100%);
}
.cp-hero h1 { color: color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 22%, var(--ink)); }
.cp-hero .cp-ico-lg { box-shadow: 0 3px 12px color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 26%, transparent); }

.case-rail {
    background: linear-gradient(100deg, rgba(var(--cat, 15, 157, 118), 0.10) 0%, var(--card) 64%);
    border-color: color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 26%, var(--line));
    border-left-color: rgb(var(--cat, 15, 157, 118));
}
.case-steps li > span {
    background: color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 16%, transparent);
    color: color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 72%, var(--ink));
}
.case-rail-title > span { background: color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 16%, transparent); }
.case-rail-title > span .mono-ico { color: color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 70%, var(--ink)); }

.pres-rail.current, .rail-jump.current {
    background: color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 10%, transparent);
}
.rail-jump.current .rail-dot { background: rgb(var(--cat, 15, 157, 118)); }
.rail-critical.current .rail-dot { background: var(--critical); }

html[data-theme="dark"] .cp-hero {
    background:
        linear-gradient(180deg, rgba(var(--cat, 15, 157, 118), 0.20) 0%, rgba(var(--cat, 15, 157, 118), 0.05) 62%, transparent 100%),
        var(--card);
}
html[data-theme="dark"] .case-rail { background: linear-gradient(100deg, rgba(var(--cat, 15, 157, 118), 0.16) 0%, var(--card) 66%); }
html[data-theme="dark"] .case-steps li > span { background: color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 24%, transparent); }

/* ══════════════════════════════════════════════════════════════════
   Shift view — the emergency screen
   This is the view opened mid-shift, so it was the least designed
   surface in the app: five identical grey boxes. It now reads as an
   ordered protocol, with the two "act now" steps carrying the critical
   colour and the sheet carrying the topic's clinical system hue.
   ══════════════════════════════════════════════════════════════════ */
.shift-sheet {
    border-color: color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 26%, var(--line));
    background:
        linear-gradient(180deg, rgba(var(--cat, 15, 157, 118), 0.08) 0%, transparent 34%),
        var(--card);
}
.shift-sheet-head h1 { color: color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 20%, var(--ink)); }
.shift-kicker { color: color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 78%, var(--ink-soft)); }

.shift-grid { gap: 16px; }
.shift-grid section {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 18px 20px;
    display: grid;
    grid-template-columns: 34px minmax(0, 1fr);
    column-gap: 14px;
    align-items: start;
}
.shift-grid section > h2 {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 34px minmax(0, 1fr);
    column-gap: 14px;
    align-items: center;
    margin: 0 0 12px;
    font-size: .95rem;
    font-weight: 650;
    color: var(--ink);
    letter-spacing: -.01em;
}
.shift-step-n {
    grid-row: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: rgba(var(--cat, 15, 157, 118), 0.14);
    color: color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 78%, var(--ink));
    font-size: .92rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}
.shift-grid section > ol,
.shift-grid section > ul,
.shift-grid section > div { grid-column: 2; }
.shift-grid section > ol { margin: 0; }
.shift-grid section > ul { margin: 0; }
.shift-grid section > div + div { margin-top: 10px; }
.shift-grid section > div strong { display: block; font-size: .85rem; color: var(--ink); margin-bottom: 3px; }
.shift-grid section > div p { font-size: .82rem; }

/* The two steps that mean "stop and act". */
.shift-grid .shift-red,
.shift-grid .shift-crit {
    background: var(--critical-bg);
    border-color: color-mix(in srgb, var(--critical) 34%, var(--line));
    border-left: 4px solid var(--critical);
}
.shift-grid .shift-red .shift-step-n,
.shift-grid .shift-crit .shift-step-n {
    background: var(--critical);
    color: #fff;
}
.shift-grid .shift-red h2,
.shift-grid .shift-crit h2 { color: var(--critical); }
.shift-grid .shift-red li,
.shift-grid .shift-crit li { color: var(--ink); }
.shift-grid .shift-red li::before,
.shift-grid .shift-crit li::before { background: var(--critical); }

.shift-grid > section:not(.shift-red):not(.shift-crit) .shift-step-n {
    background: rgba(var(--cat, 15, 157, 118), 0.14);
}
.shift-disposition > div {
    padding: 9px 12px;
    border-radius: 8px;
    background: var(--bg);
    border: 1px solid var(--line-subtle);
}

html[data-theme="dark"] .shift-sheet { background: linear-gradient(180deg, rgba(var(--cat, 15, 157, 118), 0.14) 0%, transparent 36%), var(--card); }

/* ══════════════════════════════════════════════════════════════════
   Study & Learn workspaces
   Both were flat white panels with a heading and a form. They now share
   the panel language used elsewhere (capped panel, tinted heading) and
   the empty states carry an icon so a blank queue reads as intentional
   rather than broken. No topic hue here on purpose — these workspaces
   span every clinical system, so a single colour would be a lie.
   ══════════════════════════════════════════════════════════════════ */
.study-page,
.case-practice,
.learning-workspace {
    position: relative;
    overflow: hidden;
    border-color: color-mix(in srgb, var(--accent) 22%, var(--line));
    background:
        linear-gradient(180deg, rgba(var(--accent-rgb), 0.07) 0%, transparent 220px),
        var(--card);
}
.study-page::before,
.case-practice::before,
.learning-workspace::before {
    content: "";
    position: absolute;
    inset-block-start: 0;
    inset-inline: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent) 0%, var(--accent-2) 100%);
}
.study-page-head,
.case-practice-head { padding-top: 24px; }
.study-page-head h1,
.case-practice-head h1,
.case-practice-head h2 { letter-spacing: -.03em; }

.study-tabs { margin-top: 4px; }
.study-tabs button.active { box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 30%, transparent); }

.study-empty,
.empty-filter {
    display: grid;
    justify-items: center;
    gap: 6px;
    padding: 52px 28px;
    text-align: center;
    color: var(--ink-soft);
}
.study-empty::before,
.empty-filter::before {
    content: "";
    width: 40px;
    height: 40px;
    margin-bottom: 8px;
    border-radius: 12px;
    background: rgba(var(--accent-rgb), 0.12);
    box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 22%, transparent);
}

.learning-loop,
.personal-plan,
.study-dashboard {
    border-color: color-mix(in srgb, var(--accent) 18%, var(--line));
    background: var(--card);
}
.recording-controls,
.study-actions { gap: 10px; }

.quiz-question legend { color: var(--ink); }
.quiz-option:has(input:checked) {
    border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
    background: rgba(var(--accent-rgb), 0.07);
}
.quiz-option:has(input:focus-visible) { outline: 2px solid var(--accent); outline-offset: 2px; }

.study-topic { transition: border-color var(--transition-fast) ease, background var(--transition-fast) ease; }
.study-topic:hover { border-color: color-mix(in srgb, var(--accent) 34%, var(--line)); }

.personal-plan textarea,
.study-page select,
.case-practice select {
    border-color: color-mix(in srgb, var(--accent) 20%, var(--line));
}

/* ══════════════════════════════════════════════════════════════════
   Chrome: topbar, sidebar, dialogs
   The last surfaces a reader meets. Nothing here changes behaviour —
   only edge definition, depth and the first-run disclaimer, which is
   the first thing a new user ever sees and was an unstyled box.
   ══════════════════════════════════════════════════════════════════ */
.topbar { box-shadow: 0 1px 0 var(--line-subtle); }
.topbar::after {
    content: "";
    position: absolute;
    inset-block-end: -1px;
    inset-inline: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--accent) 40%, transparent), transparent);
    opacity: .5;
    pointer-events: none;
}

.sidebar { box-shadow: 1px 0 0 var(--line-subtle); }
.side-label {
    font-size: .68rem;
    font-weight: 700;
    letter-spacing: .09em;
    text-transform: uppercase;
    color: var(--ink-soft);
    opacity: .85;
}
.side-item { transition: background var(--transition-fast) ease, color var(--transition-fast) ease; }
.side-count {
    font-variant-numeric: tabular-nums;
    font-size: .68rem;
    color: var(--ink-soft);
    background: var(--line-subtle);
    border-radius: 9999px;
    padding: 1px 7px;
}

.disclaimer-modal {
    border-radius: var(--radius-lg);
    border-color: color-mix(in srgb, var(--accent) 26%, var(--line));
    box-shadow: var(--shadow-float);
    overflow: hidden;
}
.disclaimer-modal > header,
.disclaimer-modal .modal-head {
    background: linear-gradient(180deg, rgba(var(--accent-rgb), 0.10), transparent);
    border-bottom: 1px solid var(--line-subtle);
}
.toast { border-radius: var(--radius-md); }

.results-pop {
    border-radius: var(--radius-md);
    border-color: color-mix(in srgb, var(--accent) 24%, var(--line));
    box-shadow: var(--shadow-lg);
}
.ecg-fig, .ecg-workbench-paper {
    border-color: color-mix(in srgb, var(--accent) 20%, var(--line));
}
.ecg-step-chip[aria-current="true"],
.ecg-step-chip.active {
    border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
    background: rgba(var(--accent-rgb), 0.10);
}

/* ══════════════════════════════════════════════════════════════════
   Design System v5 — Clinical Clean
   A single appended layer. Delete it and the product returns to v4.

   Direction: quiet clinical reading surfaces (cool neutral paper,
   near-black ink, one emerald accent), a flat dark navigation spine,
   and category colour spent only on the 44px icon tile — never on a
   whole section, card or layout wrapper.
   ══════════════════════════════════════════════════════════════════ */

/* ── 1 · Tokens ──────────────────────────────────────────────── */
html[data-theme][data-accent] {
    --bg: #f4f6f8;
    --card: #fff;
    --card-elevated: #fff;
    --ink: #0f1720;
    --ink-soft: #5c6975;
    --line: #e3e8ed;
    --line-subtle: #edf0f3;
    --topbar-bg: rgba(255, 255, 255, 0.86);
    --foot-bg: #f4f6f8;
    --home-hover: #f1f4f7;
    --hover-line: #c9d3db;
    --ov-job-bg: #eef2f5;
    --ov-job-line: #dfe6ec;
    --shadow-sm: 0 1px 2px rgba(13, 28, 44, 0.05);
    --shadow: 0 4px 14px rgba(13, 28, 44, 0.07);
    --shadow-md: 0 8px 22px rgba(13, 28, 44, 0.09);
    --shadow-lg: 0 14px 34px rgba(13, 28, 44, 0.10);
    --shadow-float: 0 18px 44px rgba(13, 28, 44, 0.16);
    --topbar-h: 73px;
}
html[data-theme="dark"][data-accent] {
    --bg: #0d131a;
    --card: #141b23;
    --card-elevated: #1a232c;
    --ink: #e8eef4;
    --ink-soft: #9aa8b6;
    --line: #26313d;
    --line-subtle: #1e2733;
    --topbar-bg: rgba(16, 22, 29, 0.88);
    --foot-bg: #0d131a;
    --home-hover: #1b242e;
    --hover-line: #465666;
    --ov-job-bg: #1a242e;
    --ov-job-line: #2a3743;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
    --shadow: 0 4px 16px rgba(0, 0, 0, 0.36);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.40);
    --shadow-lg: 0 14px 34px rgba(0, 0, 0, 0.45);
    --shadow-float: 0 18px 44px rgba(0, 0, 0, 0.52);
    --topbar-h: 73px;
}
html[data-theme="light"][data-accent="emerald"] {
    --brand: #10554a;
    --brand-2: #146b5c;
    --accent: #0f7f6a;
    --accent-2: #16a088;
    --accent-rgb: 15, 127, 106;
    --on-fill: #fff;
}
html[data-theme="dark"][data-accent="emerald"] {
    --brand: #7ad9c3;
    --brand-2: #7ad9c3;
    --accent: #4ecfb4;
    --accent-2: #4ecfb4;
    --accent-rgb: 78, 207, 180;
    --on-fill: #062420;
}

/* ── 2 · Flat dark navigation spine ────────────────────────────
   The sidebar carries its own custom properties so every rule that
   already paints it with --ink, --line, --ov-job-bg or --brand-2
   re-renders correctly without touching a single child selector. */
html[data-theme][data-accent] .sidebar {
    --bg: #0f171d;
    --card: #0f171d;
    --ink: #dbe4ea;
    --ink-soft: #9aa8b3;
    --line: rgba(255, 255, 255, 0.09);
    --line-subtle: rgba(255, 255, 255, 0.06);
    --hover-line: rgba(255, 255, 255, 0.18);
    --home-hover: rgba(255, 255, 255, 0.06);
    --ov-job-bg: rgba(255, 255, 255, 0.07);
    --ov-job-line: rgba(255, 255, 255, 0.12);
    --brand-2: #57d1b6;
    --accent: #42c9ac;
    --accent-2: #42c9ac;
    --accent-rgb: 66, 201, 172;
    --side-muted: #8b99a4;
    --side-sub: #77858f;
    --side-label: #6a7883;
    --side-note: #74828d;
    background: #0f171d;
    color: var(--ink);
    border-right: 1px solid rgba(255, 255, 255, 0.07);
    box-shadow: none;
}
html[data-theme] .side-item { color: #96a4af; }
html[data-theme] .side-item:hover {
    background: rgba(255, 255, 255, 0.07);
    color: #f2f6f9;
    transform: translateX(2px);
}
html[data-theme] .side-item:active {
    background: rgba(255, 255, 255, 0.12);
    transform: translateX(1px);
}
html[data-theme] .side-item.side-home {
    color: #cfe9e2;
    background: rgba(66, 201, 172, 0.10);
    border-color: rgba(66, 201, 172, 0.22);
}
html[data-theme] .side-item.active,
html[data-theme] .side-item.side-home.active {
    background: rgba(66, 201, 172, 0.15);
    border-color: rgba(66, 201, 172, 0.30);
    color: #6ee7c9;
    font-weight: 650;
    box-shadow: inset 3px 0 0 #42c9ac;
}
/* Category pods must never paint a border or glow on a nav glyph. */
html [data-cat].ico { border: 0; box-shadow: none; }
html[data-theme] .side-group > summary { color: #6c7b86; }
html[data-theme] .side-group[open] > summary { color: #d2dce3; }
html[data-theme] .side-label { color: #66757f; }
html[data-theme] .side-note { color: #6d7c87; }

/* ── 3 · Topbar ───────────────────────────────────────────────
   Grid columns and paddings are deliberately left alone: six media
   queries re-place them at 1160/1100/920/700/600/360px. */
.topbar {
    background: var(--topbar-bg);
    border-bottom-color: var(--line);
    box-shadow: none;
}
.topbar > .burger {
    border-color: transparent;
    background: transparent;
    color: var(--ink-soft);
    border-radius: 10px;
}
.topbar > .burger:hover { background: var(--home-hover); color: var(--ink); border-color: transparent; }
.topbar > .tools-toggle {
    border-color: transparent;
    background: transparent;
    color: var(--ink-soft);
    border-radius: 10px;
}
.topbar > .tools-toggle:hover { background: var(--home-hover); color: var(--ink); border-color: transparent; }
.topbar > .searchwrap {
    background: var(--bg);
    border-color: var(--line);
    border-radius: 10px;
    box-shadow: none;
}
.topbar > .searchwrap:focus-within {
    border-color: color-mix(in srgb, var(--accent) 55%, var(--line));
    box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.14);
}
html[data-theme] .primary-nav .home-btn {
    border: 0;
    background: transparent;
    color: var(--ink-soft);
    font-weight: 550;
    border-radius: 9px;
    box-shadow: none;
}
html[data-theme] .primary-nav .home-btn:hover { background: var(--home-hover); color: var(--ink); }
html[data-theme] .primary-nav .home-btn.active-nav,
html[data-theme="dark"] .primary-nav .home-btn.active-nav {
    background: rgba(var(--accent-rgb), 0.13);
    color: var(--brand-2);
    border-color: transparent;
    box-shadow: none;
}
.topbar > .context-filters > summary {
    border: 0;
    background: transparent;
    color: var(--ink-soft);
    border-radius: 9px;
    font-weight: 550;
}
.topbar > .context-filters > summary:hover { background: var(--home-hover); color: var(--ink); }
.topbar > .context-filters[open] > summary { background: rgba(var(--accent-rgb), 0.13); color: var(--brand-2); }
.topbar .context-filters .chips {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 12px;
    box-shadow: var(--shadow-float);
    padding: 10px;
}
.topbar > .topbar-tools {
    background: var(--card);
    border-color: var(--line);
    border-radius: 14px;
    box-shadow: var(--shadow-float);
}

/* ── 4 · Clinical system identity lives on the tile ────────────
   [data-cat] used to publish a candy gradient, a coloured border and
   a glow onto every element that carries the attribute — including
   <section class="home-group">, .pres-layout and .cp-hero, so whole
   screens rendered as tinted panels. The hue now rides the 44px icon
   tile and the shift step rule only. */
html[data-theme] [data-cat] { box-shadow: none; }
html[data-theme] [data-cat].home-group,
html[data-theme] [data-cat].pres-layout,
html[data-theme] [data-cat].cp-hero {
    background: transparent;
    border: 0;
    box-shadow: none;
}
html[data-theme] [data-cat].cp-ico,
html[data-theme] [data-cat].cp-ico-lg,
html[data-theme] [data-cat].study-topic-ico,
html[data-theme] [data-cat].chip-ico,
html[data-theme] [data-cat].res-ico {
    background: color-mix(in srgb, rgb(var(--cat, 100, 116, 139)) 13%, transparent);
    border: 1px solid color-mix(in srgb, rgb(var(--cat, 100, 116, 139)) 26%, transparent);
    box-shadow: none;
}
html[data-theme] [data-cat].shift-sheet {
    background: var(--card);
    border: 1px solid var(--line);
    border-top: 3px solid rgb(var(--cat, 15, 157, 118));
    box-shadow: var(--shadow-sm);
}
/* Cards go neutral; the system colour returns only as the hover edge. */
html[data-theme] .cp-grid .cp-card {
    background: var(--card);
    border-color: var(--line);
    box-shadow: var(--shadow-sm);
}
html[data-theme] .cp-grid .cp-card:hover {
    background: var(--card);
    border-color: color-mix(in srgb, rgb(var(--cat, 100, 116, 139)) 42%, var(--line));
    box-shadow: var(--shadow-md);
}
html[data-theme] .cp-grid .cp-card h3 { color: var(--ink); }
html[data-theme] .cp-grid .cp-card .cp-ico { box-shadow: none; }
html[data-theme] .cp-grid .cp-card .cp-count {
    background: transparent;
    border-color: var(--line);
    color: var(--ink-soft);
}
html[data-theme] .cp-grid .cp-card:hover .cp-count {
    color: var(--brand-2);
    border-color: color-mix(in srgb, rgb(var(--cat, 100, 116, 139)) 45%, var(--line));
}

/* ── 5 · Home ───────────────────────────────────────────────── */
.home-intro {
    position: relative;
    max-width: none;
    margin-bottom: 30px;
    padding: 4px 0 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    overflow: visible;
}
.home-intro::after { display: none; }
.home-intro > span, .home-eyebrow {
    color: var(--accent);
    font-size: .72rem;
    font-weight: 700;
    letter-spacing: .13em;
}
.home-intro h1 {
    font-size: clamp(2.05rem, 3.8vw, 2.9rem);
    font-weight: 700;
    line-height: 1.08;
    letter-spacing: -.04em;
    max-width: 17ch;
    margin: 14px 0 16px;
}
.home-intro p {
    font-size: 1.03rem;
    line-height: 1.6;
    max-width: 52ch;
    color: var(--ink-soft);
}
.home-actions { margin-top: 26px; gap: 10px; }
.home-actions button {
    min-height: 44px;
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 11px 18px;
    background: var(--card);
    color: var(--ink);
    font-size: .86rem;
    font-weight: 600;
}
.home-actions button:first-child {
    background: var(--brand-2);
    border-color: var(--brand-2);
    color: var(--on-fill);
    box-shadow: var(--shadow-sm);
}
.home-actions button:hover { border-color: var(--hover-line); box-shadow: var(--shadow-sm); }
.home-actions button:first-child:hover { background: var(--brand-2); border-color: var(--brand-2); box-shadow: var(--shadow); }
.home-meta {
    margin-top: 26px;
    padding-top: 16px;
    border-top: 1px solid var(--line);
    gap: 8px 24px;
    font-size: .76rem;
    color: var(--ink-soft);
}
.home-group { margin-top: 34px; margin-bottom: 8px; }
.group-title {
    font-size: .82rem;
    font-weight: 700;
    letter-spacing: .05em;
    gap: 10px;
    margin-bottom: 16px;
    color: var(--ink);
}
.group-title::after { background: var(--line); }
.group-title > span {
    background: var(--ov-job-bg);
    border: 0;
    color: var(--ink-soft);
    padding: 2px 9px;
    border-radius: 999px;
    font-size: .68rem;
    font-weight: 650;
    letter-spacing: 0;
    opacity: 1;
}
.library-head h2 { font-weight: 700; letter-spacing: -.025em; }
.library-filters > summary { border-radius: 9px; }

/* ── 6 · Supporting home panels ─────────────────────────────── */
.workspace-entry > a, .workspace-card {
    background: var(--card);
    border-color: var(--line);
    border-radius: 14px;
    box-shadow: var(--shadow-sm);
}
.workspace-entry > a:hover, .workspace-card[href]:hover {
    border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
    box-shadow: var(--shadow-md);
}
.student-start {
    background: var(--card);
    border: 1px solid var(--line);
    border-left: 3px solid var(--accent);
    border-radius: 14px;
    box-shadow: var(--shadow-sm);
}
.student-start h2 { font-weight: 700; letter-spacing: -.02em; }
.study-dashboard.study-dashboard-compact {
    background: var(--card);
    border-color: var(--line);
    box-shadow: var(--shadow-sm);
}

/* ── 7 · Presentation ───────────────────────────────────────── */
.breadcrumbs { font-size: .77rem; font-weight: 550; margin-bottom: 14px; }
.crumb-group { color: var(--brand-2); }
.cp-hero { margin-bottom: 26px; }
.cp-hero h1 { font-weight: 700; letter-spacing: -.035em; line-height: 1.15; }
.cp-hero .tag { line-height: 1.6; }
.cp-hero .back-btn {
    min-height: 34px;
    gap: 6px;
    font-size: .77rem;
    font-weight: 550;
    color: var(--ink-soft);
    border-radius: 8px;
}
.cp-hero .back-btn:hover { background: var(--home-hover); color: var(--brand-2); }
.pres-rail {
    padding: 6px 6px 8px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 14px;
    box-shadow: var(--shadow-sm);
}
.pres-rail-label { padding: 8px 8px 9px; margin-bottom: 6px; border-bottom: 1px solid var(--line-subtle); letter-spacing: .1em; }
.rail-jump { min-height: 34px; padding: 7px 9px; font-size: .8rem; border-radius: 9px; }
.rail-jump.current {
    background: rgba(var(--accent-rgb), 0.13);
    color: var(--brand-2);
    font-weight: 650;
}
.section-card {
    border-color: var(--line);
    border-radius: 14px;
    box-shadow: var(--shadow-sm);
}
.section-card:hover { border-color: var(--hover-line); box-shadow: var(--shadow); }
.sec-head { font-weight: 600; letter-spacing: -.005em; }
.case-rail {
    background: rgba(var(--accent-rgb), 0.07);
    border: 1px solid rgba(var(--accent-rgb), 0.30);
    border-left: 4px solid var(--accent);
    border-radius: 14px;
    box-shadow: none;
}
.case-rail-title strong { font-weight: 700; }

/* ── 8 · Shift, practice, ECG ───────────────────────────────── */
.shift-sheet-head h1 { font-weight: 700; letter-spacing: -.03em; }
.shift-grid section {
    background: var(--card);
    border-color: var(--line);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
}
.shift-grid .shift-red, .shift-grid .shift-crit { box-shadow: var(--shadow-sm); }
.study-topic, .study-topic-ico { transition: background var(--transition-fast) ease, border-color var(--transition-fast) ease; }
.results-pop {
    background: var(--card);
    border-color: var(--line);
    box-shadow: var(--shadow-float);
}
.toast {
    background: var(--card);
    border-color: var(--line);
    box-shadow: var(--shadow-float);
}
dialog, .modal, .disclaimer-modal {
    box-shadow: var(--shadow-float);
}

/* ── 9 · Dark mode ──────────────────────────────────────────── */
html[data-theme="dark"] [data-cat].cp-ico,
html[data-theme="dark"] [data-cat].cp-ico-lg,
html[data-theme="dark"] [data-cat].study-topic-ico,
html[data-theme="dark"] [data-cat].chip-ico,
html[data-theme="dark"] [data-cat].res-ico {
    background: color-mix(in srgb, rgb(var(--cat, 100, 116, 139)) 26%, transparent);
    border-color: color-mix(in srgb, rgb(var(--cat, 100, 116, 139)) 40%, transparent);
}
html[data-theme="dark"] .case-rail { background: rgba(var(--accent-rgb), 0.12); border-color: rgba(var(--accent-rgb), 0.34); }
html[data-theme="dark"] .home-actions button:first-child { box-shadow: none; }
html[data-theme="dark"] .section-card:hover { box-shadow: none; }

/* ── 10 · Responsive reconciliation ───────────────────────────
   Every property set above that is also re-set inside an existing
   media query has to be re-stated here, or this later layer would
   silently win at mobile widths. */
@media (max-width: 700px) {
    .home-intro h1 { font-size: clamp(1.7rem, 7vw, 2.1rem); margin-top: 10px; }
    .home-intro p { font-size: .95rem; }
}
@media (max-width: 600px) {
    .home-intro { padding: 0 0 22px; border-radius: 0; }
    .home-actions { margin-top: 18px; gap: 8px; }
    .home-actions button { padding-inline: 14px; font-size: .82rem; }
    .group-title { font-size: .78rem; margin-bottom: 12px; }
    .cp-hero { margin-bottom: 20px; }
}
@media (max-height: 500px) and (orientation: landscape) {
    .cp-hero { margin-bottom: 12px; }
}

/* ── 11 · Print ─────────────────────────────────────────────── */
@media print {
    html[data-theme][data-accent],
    html[data-theme="dark"][data-accent] {
        --bg: #fff;
        --card: #fff;
        --ink: #111;
        --ink-soft: #444;
        --line: #ddd;
        --line-subtle: #e6e6e6;
        --topbar-bg: #fff;
        --foot-bg: #fff;
        --home-hover: transparent;
        --hover-line: #ddd;
        --ov-job-bg: #f4f7f6;
        --ov-job-line: #cde9de;
        --shadow-sm: none;
        --shadow: none;
        --shadow-md: none;
        --shadow-lg: none;
        --shadow-float: none;
    }
    html[data-theme="light"][data-accent="emerald"],
    html[data-theme="dark"][data-accent="emerald"] {
        --brand: #0b3d2e;
        --brand-2: #115743;
        --accent: #0f9d76;
        --accent-rgb: 15, 157, 118;
        --on-fill: #fff;
    }
    html[data-theme][data-accent] .sidebar { background: #fff; }
    html[data-theme] [data-cat].cp-ico,
    html[data-theme] [data-cat].cp-ico-lg { background: transparent; border-color: #ccc; }
    html[data-theme] [data-cat].shift-sheet { border-top-color: #111; }
}

/* ══════════════════════════════════════════════════════════════════
   Design System v5.1 — Tighten & Unify
   ──────────────────────────────────────────────────────────────────
   Two changes, both reversible by deleting this block:
   1 · TIGHTEN  the vertical bulk that made long screens feel loose.
        Every property touched here is re-declared at the breakpoints
        where it is already re-set (920 / 700 / 600) plus print, so no
        earlier media query is silently clobbered.
        Touch targets (min-height 44px) are never reduced.
   2 · UNIFY    the twenty category hues to the single accent already
        chosen in the topbar, so a screen reads as one calm colour
        rather than confetti. Colour stays a faint tint, a dot and a
        1px edge — never a filled panel.
   ════════════════════════════════════════════════════════════════ */

/* ── 1 · One accent instead of twenty category hues ───────────── */
html[data-theme][data-accent] [data-cat] { --cat: var(--accent-rgb); }

/* The accent stays quiet where the old category hue was loud. */
html[data-theme] .cp-grid .cp-card:hover {
    border-color: color-mix(in srgb, rgb(var(--cat, 100, 116, 139)) 30%, var(--line));
}
html[data-theme] .cp-grid .cp-card:hover .cp-count {
    border-color: color-mix(in srgb, rgb(var(--cat, 100, 116, 139)) 34%, var(--line));
}
.case-steps li > span { color: color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 56%, var(--ink)); }
.case-rail-title > span .mono-ico { color: color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 54%, var(--ink)); }
.shift-kicker { color: color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 60%, var(--ink-soft)); }
html[data-theme="dark"] [data-cat].cp-ico,
html[data-theme="dark"] [data-cat].cp-ico-lg,
html[data-theme="dark"] [data-cat].study-topic-ico,
html[data-theme="dark"] [data-cat].chip-ico,
html[data-theme="dark"] [data-cat].res-ico {
    background: color-mix(in srgb, rgb(var(--cat, 100, 116, 139)) 20%, transparent);
    border-color: color-mix(in srgb, rgb(var(--cat, 100, 116, 139)) 32%, transparent);
}

/* ── 2 · Tighten — desktop base ───────────────────────────────── */
.main .stage { padding: 28px 32px 32px; }
.main .stage:has(> .ecg-explorer) { padding: 18px 22px 28px; }
.foot { padding: 14px 32px; }

.home-intro { padding: 2px 0 0; margin-bottom: 20px; }
.home-intro h1 { margin: 10px 0 12px; }
.home-actions { margin-top: 16px; gap: 8px; }
.home-meta { margin-top: 16px; padding-top: 10px; gap: 8px 20px; }
.home-group { margin-top: 24px; margin-bottom: 6px; }
.group-title { margin-bottom: 10px; gap: 10px; }
.workspace-entry { margin: 16px 0; }

.student-start { padding: 16px; margin: 12px 0 18px; }
.student-intro { padding: 16px; margin: 12px 0 18px; }
.student-actions { margin: 8px 0; gap: 8px; }

.breadcrumbs { margin-bottom: 10px; }
.cp-hero { padding: 16px clamp(16px, 3vw, 26px) 18px; margin-bottom: 18px; }
.section-card { margin-bottom: 10px; }
.sec-head { padding: 14px 20px; min-height: 54px; gap: 10px; }
.sec-body { padding: 0 20px 16px; }
.case-rail { padding: 16px 22px; margin-bottom: 14px; gap: 12px; }
.cp-grid { gap: 8px; }
.cp-grid .cp-card { padding: 14px 16px; min-height: 90px; gap: 4px 10px; }

.pres-rail { padding: 5px 5px 6px; }
.pres-rail-label { padding: 6px 8px 7px; margin-bottom: 4px; }
.rail-jump { padding: 6px 8px; gap: 8px; }
.pres-layout { gap: 0 24px; }

.study-page { padding: clamp(16px, 3vw, 28px); }
.study-page-head { padding-top: 18px; }
.shift-sheet { padding: clamp(16px, 3vw, 24px); }

.side-item { padding: 8px 12px; }
.side-label { padding: 6px 10px 4px; }
.side-list { gap: 4px; }
.chips { gap: 5px; }
.chip { padding: 5px 11px; }

/* ── 3 · Tighten — mirrored breakpoints ─────────────────────────
   Each block restates only the properties that an earlier media query
   also sets at that width, with the tightened value for that width. */
@media (max-width: 920px) {
    .main .stage { padding: 20px 20px 26px; }
    .chips { gap: 5px; }
    .cp-hero { padding: 14px clamp(14px, 2.5vw, 20px) 16px; margin-bottom: 16px; }
    .case-rail { padding: 14px 18px; gap: 10px; }
}
@media (max-width: 700px) {
    .main .stage:has(> .ecg-explorer) { padding: 12px 12px 24px; }
    .student-start { padding: 14px; margin-top: 8px; }
    .student-intro { padding: 14px; }
}
@media (max-width: 600px) {
    .main .stage { padding: 15px 14px 22px; }
    .foot { padding: 12px 16px calc(16px + env(safe-area-inset-bottom, 0px)); }
    .home-intro { padding: 0 0 16px; margin-bottom: 16px; }
    .home-actions { margin-top: 12px; gap: 8px; }
    .group-title { margin-bottom: 8px; }
    .cp-hero { padding: 13px 14px 14px; margin-bottom: 13px; }
    .sec-head { padding: 12px 14px; min-height: 52px; }
    .sec-body { padding: 0 14px 13px; }
    .case-rail { padding: 13px 15px; }
    .cp-grid { gap: 7px; }
    .cp-grid .cp-card { padding: 12px 14px; min-height: 84px; gap: 3px 8px; }
    .shift-sheet { padding: 15px; }
}
@media print {
    .main .stage { padding: 0; }
    .main .stage:has(> .ecg-explorer) { padding: 0; }
}

/* ══════════════════════════════════════════════════════════════════
   Design System v6 — Modern Polish, Depth & Clinical Elegance
   ──────────────────────────────────────────────────────────────────
   Elevates EM Pocket to a world-class, modern clinical reference:
   1 · Refined surface tokens & multi-stop ambient shadows.
   2 · Glassmorphic sticky topbar with segmented primary navigation.
   3 · Spotlight-style search bar with mechanical kbd badge & smooth popup.
   4 · Inspiring home hero with live status pulse & interactive pathway cards.
   5 · High-impact clinical presentation view with priority rail hierarchy.
   6 · Distinct diagnostic cards (Critical, Emergent, Common) with crisp rails.
   7 · Responsive touch ergonomics & springy tactile micro-feedback.
   ════════════════════════════════════════════════════════════════ */

:root {
    --shadow-xs: 0 1px 2px rgba(15, 36, 30, 0.05);
    --shadow-sm: 0 1px 3px rgba(15, 36, 30, 0.06), 0 1px 2px rgba(15, 36, 30, 0.04);
    --shadow-md: 0 4px 14px -2px rgba(15, 36, 30, 0.08), 0 2px 6px -1px rgba(15, 36, 30, 0.04);
    --shadow-lg: 0 10px 28px -4px rgba(15, 36, 30, 0.10), 0 4px 10px -2px rgba(15, 36, 30, 0.05);
    --shadow-float: 0 18px 48px -6px rgba(15, 36, 30, 0.16), 0 8px 18px -4px rgba(15, 36, 30, 0.08);
}

html[data-theme="dark"] {
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.35);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.45), 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px -2px rgba(0, 0, 0, 0.55), 0 2px 8px -1px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 12px 32px -4px rgba(0, 0, 0, 0.65), 0 4px 12px -2px rgba(0, 0, 0, 0.4);
    --shadow-float: 0 20px 52px -6px rgba(0, 0, 0, 0.8), 0 8px 24px -4px rgba(0, 0, 0, 0.5);
}

/* ── Topbar & Modern Nav ── */
.topbar {
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--line);
    transition: background-color var(--transition-smooth) ease, border-color var(--transition-smooth) ease;
}

@media (min-width: 1161px) {
    .primary-nav {
        background: color-mix(in srgb, var(--ink) 4%, transparent);
        border: 1px solid color-mix(in srgb, var(--ink) 6%, transparent);
        border-radius: 12px;
        padding: 2px;
        gap: 2px;
    }
    .primary-nav .home-btn {
        border-radius: 9px;
        font-weight: 600;
        transition: all 0.16s ease;
    }
    .primary-nav .home-btn:hover {
        background: color-mix(in srgb, var(--ink) 6%, transparent);
        color: var(--ink);
    }
    .primary-nav .home-btn.active-nav,
    html[data-theme="dark"] .primary-nav .home-btn.active-nav {
        background: var(--card);
        color: var(--brand-2);
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 0 0 1px color-mix(in srgb, var(--brand-2) 20%, transparent);
        font-weight: 700;
    }
    html[data-theme="dark"] .primary-nav .home-btn.active-nav {
        background: var(--card-elevated);
        color: var(--accent);
        box-shadow: 0 1px 4px rgba(0, 0, 0, 0.35), 0 0 0 1px rgba(var(--accent-rgb), 0.35);
    }
}

/* ── Search Bar Finesse ── */
.topbar > .searchwrap {
    background: var(--card);
    border: 1.5px solid var(--line);
    border-radius: 11px;
    box-shadow: var(--shadow-xs);
    transition: border-color var(--transition-fast) ease, box-shadow var(--transition-fast) ease, background-color var(--transition-fast) ease;
}
.topbar > .searchwrap:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.16), var(--shadow-sm);
    background: var(--card);
}
.search-kbd {
    background: color-mix(in srgb, var(--ink) 5%, transparent);
    border: 1px solid color-mix(in srgb, var(--ink) 12%, transparent);
    border-bottom: 2px solid color-mix(in srgb, var(--ink) 20%, transparent);
    border-radius: 5px;
    font-family: inherit;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 1px 6px;
    color: var(--ink-soft);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.search-clear-btn {
    background: color-mix(in srgb, var(--ink) 8%, transparent);
    border: 0;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    color: var(--ink-soft);
    cursor: pointer;
    transition: all 0.15s ease;
}
.search-clear-btn:hover {
    background: color-mix(in srgb, var(--ink) 16%, transparent);
    color: var(--ink);
}

/* ── Search Results Popover ── */
.results-pop {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 14px;
    box-shadow: var(--shadow-float);
    -webkit-backdrop-filter: blur(24px);
    backdrop-filter: blur(24px);
    padding: 6px;
}
.res-item {
    border-radius: 10px;
    border-bottom: 0;
    margin-bottom: 2px;
    padding: 8px 12px;
    transition: background-color var(--transition-fast) ease, transform var(--transition-fast) ease;
}
.res-item:hover, .res-item.active {
    background: var(--home-hover);
    transform: translateX(2px);
}
.r-tag {
    background: color-mix(in srgb, var(--accent) 12%, transparent);
    color: var(--brand-2);
    border-radius: 6px;
    padding: 2px 7px;
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
html[data-theme="dark"] .r-tag {
    color: var(--accent);
}

/* ── Reading Settings Panel ── */
.topbar > .topbar-tools {
    border-radius: 16px;
    border: 1px solid var(--line);
    box-shadow: var(--shadow-float);
    padding: 16px;
}
.topbar-tools .pref-tools {
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 3px;
    gap: 2px;
}
.pref-btn {
    border-radius: 7px;
    border: 0;
    background: transparent;
    box-shadow: none;
    transition: all var(--transition-fast) ease;
}
.pref-btn:hover {
    background: var(--home-hover);
    color: var(--ink);
}
.accent-dot {
    width: 30px;
    height: 30px;
    transition: transform var(--transition-fast) ease, box-shadow var(--transition-fast) ease;
}
.accent-dot:hover {
    transform: scale(1.14);
}
.accent-dot[aria-pressed="true"] {
    box-shadow: 0 0 0 2px var(--card), 0 0 0 4px var(--accent);
    transform: scale(1.08);
}

/* ── Home Hero Elevation ── */
.home-intro > span.study-kicker {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 4px 12px;
    border-radius: 999px;
    background: color-mix(in srgb, var(--accent) 12%, transparent);
    border: 1px solid color-mix(in srgb, var(--accent) 26%, transparent);
    color: var(--brand-2);
    font-size: 0.72rem;
    font-weight: 750;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}
html[data-theme="dark"] .home-intro > span.study-kicker {
    color: var(--accent);
}
.home-intro > span.study-kicker::before {
    content: "";
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 8px var(--accent);
    flex-shrink: 0;
}
.home-intro h1 {
    font-weight: 800;
    letter-spacing: -0.035em;
    color: var(--ink);
}
.home-intro p {
    color: var(--ink-soft);
    font-size: 1.02rem;
    line-height: 1.6;
}
.home-actions button:first-child {
    background: linear-gradient(135deg, var(--brand-2) 0%, var(--accent) 100%);
    border: 0;
    color: #ffffff;
    box-shadow: 0 4px 14px rgba(var(--shadow-rgb), 0.35);
    transition: transform var(--transition-fast) ease, box-shadow var(--transition-fast) ease;
}
.home-actions button:first-child:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(var(--shadow-rgb), 0.45);
}
.home-actions button:first-child:active {
    transform: translateY(0) scale(0.98);
}
.home-actions button:not(:first-child) {
    background: var(--card);
    border: 1.5px solid var(--line);
    color: var(--ink);
    box-shadow: var(--shadow-xs);
    transition: transform var(--transition-fast) ease, border-color var(--transition-fast) ease, box-shadow var(--transition-fast) ease;
}
.home-actions button:not(:first-child):hover {
    border-color: var(--accent);
    background: var(--home-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}
.home-actions button:not(:first-child):active {
    transform: translateY(0) scale(0.98);
}
.home-meta {
    gap: 8px 14px;
}
.home-meta span {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: 999px;
    background: color-mix(in srgb, var(--ink) 4%, transparent);
    border: 1px solid color-mix(in srgb, var(--ink) 8%, transparent);
    font-weight: 600;
    color: var(--ink-soft);
}
#offlineStatus::before {
    content: "";
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #16a34a;
    display: inline-block;
    margin-right: 6px;
    box-shadow: 0 0 6px #16a34a;
}

/* ── Workspace Entry Cards (01, 02, 03) ── */
.workspace-entry > a {
    position: relative;
    padding: 22px 24px;
    border: 1.5px solid var(--line);
    border-radius: 16px;
    background: var(--card);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.2s ease, box-shadow 0.2s ease;
}
.workspace-entry > a::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent) 0%, transparent 100%);
    opacity: 0;
    transition: opacity 0.2s ease;
}
.workspace-entry > a:hover {
    transform: translateY(-3px);
    border-color: color-mix(in srgb, var(--accent) 55%, var(--line));
    box-shadow: var(--shadow-md);
}
.workspace-entry > a:hover::before {
    opacity: 1;
}
.workspace-entry span {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    padding: 3px 10px;
    border-radius: 999px;
    background: color-mix(in srgb, var(--accent) 12%, transparent);
    border: 1px solid color-mix(in srgb, var(--accent) 24%, transparent);
    color: var(--brand-2);
    font-size: 0.74rem;
    font-weight: 750;
    letter-spacing: 0.06em;
    margin-bottom: 12px;
}
html[data-theme="dark"] .workspace-entry span {
    color: var(--accent);
}
.workspace-entry strong {
    font-size: 1.16rem;
    font-weight: 750;
    letter-spacing: -0.02em;
    color: var(--ink);
}
.workspace-entry p {
    font-size: 0.88rem;
    line-height: 1.55;
    color: var(--ink-soft);
    margin-top: 8px;
}

/* ── Study Dashboard Compact ── */
.study-dashboard.study-dashboard-compact {
    border-radius: 16px;
    border: 1.5px solid var(--line);
    background: var(--card);
    box-shadow: var(--shadow-sm);
    padding: 14px 18px;
}
.study-dashboard-compact .study-stat {
    border-radius: 10px;
    padding: 8px 14px;
    transition: background-color var(--transition-fast) ease, transform var(--transition-fast) ease;
}
.study-dashboard-compact .study-stat:hover {
    background: var(--home-hover);
    transform: translateY(-1px);
}
.study-dashboard-compact .study-stat:active {
    transform: scale(0.97);
}
.study-dashboard-compact .study-stat strong {
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}
.study-dashboard-compact .study-stat span {
    font-size: 0.74rem;
    font-weight: 600;
    color: var(--ink-soft);
}

/* ── Presentation Cards Grid & Card ── */
.cp-grid {
    gap: 12px;
}
.cp-grid .cp-card {
    border: 1.5px solid var(--line);
    border-radius: 15px;
    padding: 16px 18px;
    min-height: 98px;
    background: var(--card);
    box-shadow: var(--shadow-sm);
    transition: transform 0.18s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.18s ease, border-color 0.18s ease;
}
.cp-grid .cp-card:hover {
    transform: translateY(-2px);
    border-color: color-mix(in srgb, var(--accent) 55%, var(--line));
    box-shadow: var(--shadow-md);
}
.cp-grid .cp-card:active {
    transform: scale(0.985);
}
.cp-card .cp-ico {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: color-mix(in srgb, var(--accent) 10%, transparent);
    border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
    transition: transform 0.18s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.18s ease;
}
.cp-grid .cp-card:hover .cp-ico {
    transform: scale(1.08);
    box-shadow: 0 4px 12px rgba(var(--accent-rgb), 0.2);
}
.cp-grid .cp-card h3 {
    font-size: 1rem;
    font-weight: 750;
    letter-spacing: -0.02em;
    color: var(--ink);
}
.cp-grid .cp-card .cp-count {
    font-size: 0.7rem;
    font-weight: 700;
    padding: 3px 9px;
    border-radius: 999px;
    background: color-mix(in srgb, var(--ink) 5%, transparent);
    border: 1px solid color-mix(in srgb, var(--ink) 10%, transparent);
    color: var(--ink-soft);
}
.cp-grid .cp-card:hover .cp-count {
    border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
    color: var(--brand-2);
}
html[data-theme="dark"] .cp-grid .cp-card:hover .cp-count {
    color: var(--accent);
}
.cp-grid .cp-reviewed, .cp-grid .cp-saved {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--brand-2);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
html[data-theme="dark"] .cp-grid .cp-reviewed,
html[data-theme="dark"] .cp-grid .cp-saved {
    color: var(--accent);
}

/* ── Section Cards (Clinical Presentation Detail) ── */
.section-card {
    border: 1.5px solid var(--line);
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    background: var(--card);
    transition: border-color var(--transition-fast) ease, box-shadow var(--transition-fast) ease;
}
.section-card:hover {
    border-color: var(--hover-line);
    box-shadow: var(--shadow);
}
.sec-head {
    font-weight: 700;
    letter-spacing: -0.015em;
    font-size: 1.02rem;
    padding: 16px 22px;
    min-height: 56px;
}
.sec-head .arrow {
    transition: transform 0.2s ease;
    font-size: 0.75rem;
    font-weight: 800;
}
.section-card.closed .sec-head .arrow {
    transform: rotate(-90deg);
}

/* ── Diagnostic Cards inside Don't Miss ── */
.dx-card {
    border-radius: 12px;
    border: 1px solid var(--line);
    padding: 16px 18px;
    background: var(--card);
    box-shadow: var(--shadow-xs);
    transition: transform var(--transition-fast) ease, border-color var(--transition-fast) ease;
}
.dx-card:hover {
    transform: translateX(3px);
    border-color: var(--hover-line);
}
.dx-card.sev-critical {
    border-left: 4px solid var(--critical);
    background: color-mix(in srgb, var(--critical) 4%, var(--card));
}
.dx-card.sev-emergent {
    border-left: 4px solid var(--emergent);
    background: color-mix(in srgb, var(--emergent) 4%, var(--card));
}
.dx-card.sev-common {
    border-left: 4px solid var(--common);
    background: color-mix(in srgb, var(--common) 4%, var(--card));
}
.dx-card h4 {
    font-size: 0.95rem;
    font-weight: 750;
    line-height: 1.4;
    color: var(--ink);
}
.sev-tag {
    font-size: 0.68rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 999px;
    border: 1px solid var(--line);
}

/* ── Red Flag Items Checklist ── */
.rf-box {
    border-radius: 14px;
    border: 1.5px solid var(--critical-line);
    background: color-mix(in srgb, var(--critical) 3%, var(--card));
    padding: 18px;
}
.rf-item {
    border-radius: 10px;
    border: 1px solid var(--line);
    background: var(--card);
    padding: 12px 14px;
    margin-bottom: 6px;
    transition: all 0.15s ease;
    cursor: pointer;
}
.rf-item:hover {
    border-color: var(--critical-line);
    background: var(--home-hover);
}
.rf-item:has(input:checked) {
    background: color-mix(in srgb, var(--critical) 8%, var(--card));
    border-color: var(--critical);
    font-weight: 650;
}
.rf-tools button {
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.78rem;
    padding: 6px 12px;
    cursor: pointer;
    transition: all 0.15s ease;
}

/* ── Pearls & Pitfalls ── */
.pp-box.pearls {
    border-radius: 14px;
    border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
    background: color-mix(in srgb, var(--accent) 5%, var(--card));
    border-left: 4px solid var(--accent);
    padding: 18px 20px;
}
.pp-box.pitfalls {
    border-radius: 14px;
    border: 1px solid color-mix(in srgb, var(--gold) 35%, transparent);
    background: color-mix(in srgb, var(--gold) 6%, var(--card));
    border-left: 4px solid var(--gold);
    padding: 18px 20px;
}

/* ── Disposition Columns ── */
.disp-col {
    border-radius: 12px;
    border: 1px solid var(--line);
    padding: 16px 18px;
    background: var(--card);
    box-shadow: var(--shadow-xs);
}
.disp-col.d-discharge {
    border-left: 4px solid #16a34a;
    background: color-mix(in srgb, #16a34a 5%, var(--card));
}
.disp-col.d-admit {
    border-left: 4px solid #ea580c;
    background: color-mix(in srgb, #ea580c 5%, var(--card));
}
.disp-col.d-icu {
    border-left: 4px solid #dc2626;
    background: color-mix(in srgb, #dc2626 5%, var(--card));
}
.disp-col h4 {
    font-weight: 750;
    font-size: 0.95rem;
    margin-bottom: 8px;
}

/* ── Back button in Hero ── */
.cp-hero .back-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: var(--card);
    color: var(--ink-soft);
    font-size: 0.8rem;
    font-weight: 600;
    box-shadow: var(--shadow-xs);
    cursor: pointer;
    transition: all var(--transition-fast) ease;
}
.cp-hero .back-btn:hover {
    background: var(--home-hover);
    color: var(--brand-2);
    border-color: var(--hover-line);
    transform: translateX(-2px);
}

/* ── Disclaimer Modal Finesse ── */
.disclaimer-overlay {
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
}
.disclaimer-modal {
    border-radius: 20px;
    border: 1px solid var(--line);
    box-shadow: var(--shadow-float);
    background: var(--card);
}
.disclaimer-btn {
    background: linear-gradient(135deg, var(--brand-2) 0%, var(--accent) 100%);
    border-radius: 12px;
    font-weight: 750;
    font-size: 0.95rem;
    box-shadow: 0 4px 16px rgba(var(--shadow-rgb), 0.35);
    transition: transform var(--transition-fast) ease, box-shadow var(--transition-fast) ease;
}
.disclaimer-btn:not(:disabled):hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 22px rgba(var(--shadow-rgb), 0.45);
}
.disclaimer-btn:not(:disabled):active {
    transform: scale(0.98);
}

/* ══════════════════════════════════════════════════════════════════
   iOS 18 Standard — Unified Layouts, Squircles & Tactile Refinement
   ══════════════════════════════════════════════════════════════════ */
.sec-head {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    font-weight: 700;
    letter-spacing: -0.015em;
    font-size: 1.02rem;
    padding: 14px 20px;
    min-height: 56px;
    background: var(--card);
    border: none;
    text-align: start;
    cursor: pointer;
    color: var(--ink);
    transition: background var(--transition-fast) ease;
}
.sec-head:hover {
    background: var(--home-hover);
}
.sec-head .sec-title {
    flex: 1;
    min-width: 0;
}
.sec-head .sec-ico {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 9px;
    flex: none;
    background: var(--surface-2, rgba(0, 0, 0, 0.05));
    color: var(--brand-2);
    transition: transform var(--transition-fast) ease, background var(--transition-fast) ease;
}
.sec-head .sec-ico svg {
    width: 17px;
    height: 17px;
    display: block;
    stroke: currentColor;
    stroke-width: 2.1;
}

/* iOS 18 squircle semantic tints */
.section-card[data-section="dont-miss"] .sec-ico {
    background: rgba(239, 68, 68, 0.12);
    color: #ef4444;
}
.section-card[data-section="red-flags"] .sec-ico,
.section-card[data-section="ecg-red-flags"] .sec-ico {
    background: rgba(244, 63, 94, 0.12);
    color: #f43f5e;
}
.section-card[data-section="how-to-think"] .sec-ico,
.section-card[data-section="ecg-how"] .sec-ico {
    background: rgba(99, 102, 241, 0.12);
    color: #6366f1;
}
.section-card[data-section="history"] .sec-ico {
    background: rgba(14, 165, 233, 0.12);
    color: #0284c7;
}
.section-card[data-section="exam"] .sec-ico {
    background: rgba(20, 184, 166, 0.12);
    color: #0d9488;
}
.section-card[data-section="workup"] .sec-ico {
    background: rgba(168, 85, 247, 0.12);
    color: #9333ea;
}
.section-card[data-section="disposition"] .sec-ico {
    background: rgba(16, 185, 129, 0.12);
    color: #059669;
}
.section-card[data-section="pearls-pitfalls"] .sec-ico {
    background: rgba(245, 158, 11, 0.14);
    color: #d97706;
}
.section-card[data-section="see-also"] .sec-ico,
.section-card[data-section="references"] .sec-ico,
.section-card[data-section="ecg-patterns"] .sec-ico,
.section-card[data-section="ecg-references"] .sec-ico,
.section-card[data-section="ecg-related"] .sec-ico {
    background: rgba(100, 116, 139, 0.12);
    color: #475569;
}
html[data-theme="dark"] .section-card[data-section="dont-miss"] .sec-ico {
    background: rgba(239, 68, 68, 0.22);
    color: #fca5a5;
}
html[data-theme="dark"] .section-card[data-section="red-flags"] .sec-ico,
html[data-theme="dark"] .section-card[data-section="ecg-red-flags"] .sec-ico {
    background: rgba(244, 63, 94, 0.22);
    color: #fda4af;
}
html[data-theme="dark"] .section-card[data-section="how-to-think"] .sec-ico,
html[data-theme="dark"] .section-card[data-section="ecg-how"] .sec-ico {
    background: rgba(99, 102, 241, 0.22);
    color: #a5b4fc;
}
html[data-theme="dark"] .section-card[data-section="history"] .sec-ico {
    background: rgba(14, 165, 233, 0.22);
    color: #7dd3fc;
}
html[data-theme="dark"] .section-card[data-section="exam"] .sec-ico {
    background: rgba(20, 184, 166, 0.22);
    color: #5eead4;
}
html[data-theme="dark"] .section-card[data-section="workup"] .sec-ico {
    background: rgba(168, 85, 247, 0.22);
    color: #d8b4fe;
}
html[data-theme="dark"] .section-card[data-section="disposition"] .sec-ico {
    background: rgba(16, 185, 129, 0.22);
    color: #6ee7b7;
}
html[data-theme="dark"] .section-card[data-section="pearls-pitfalls"] .sec-ico {
    background: rgba(245, 158, 11, 0.22);
    color: #fde047;
}
html[data-theme="dark"] .section-card[data-section="see-also"] .sec-ico,
html[data-theme="dark"] .section-card[data-section="references"] .sec-ico,
html[data-theme="dark"] .section-card[data-section="ecg-patterns"] .sec-ico,
html[data-theme="dark"] .section-card[data-section="ecg-references"] .sec-ico,
html[data-theme="dark"] .section-card[data-section="ecg-related"] .sec-ico {
    background: rgba(148, 163, 184, 0.18);
    color: #cbd5e1;
}

/* ── Rotating Chevron ── */
.sec-head .arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: none;
    width: 26px;
    height: 26px;
    border-radius: 8px;
    background: transparent;
    color: var(--ink-soft);
    margin-left: auto;
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), background var(--transition-fast) ease;
}
.sec-head .arrow .sec-chevron,
.sec-head .arrow svg {
    width: 14px;
    height: 14px;
    display: block;
    stroke: currentColor;
}
.section-card.closed .sec-head .arrow {
    transform: rotate(-90deg);
}

/* ── Save Topic Button & Badge ── */
.save-topic {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: var(--card);
    color: var(--ink);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: var(--shadow-xs);
    transition: all var(--transition-fast) ease;
}
.save-topic:hover {
    border-color: var(--hover-line);
    background: var(--home-hover);
}
.save-topic:active {
    transform: scale(0.97);
}
.save-topic.active {
    color: #d97706;
    background: rgba(245, 158, 11, 0.10);
    border-color: rgba(245, 158, 11, 0.35);
}
html[data-theme="dark"] .save-topic.active {
    color: #fbbf24;
    background: rgba(245, 158, 11, 0.18);
    border-color: rgba(245, 158, 11, 0.45);
}
.save-topic .save-ico {
    display: block;
    flex: none;
}
.save-topic .save-ico.filled {
    color: #f59e0b;
}
.cp-saved {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: #d97706;
}
.cp-saved .save-ico.filled {
    width: 13px;
    height: 13px;
    color: #f59e0b;
}

/* ── Harmonized Grouped Sheet Surfaces & Rhythm ── */
.shift-sheet,
.study-page,
.learning-workspace {
    border-radius: 16px;
    border: 1px solid var(--line);
    background: var(--card);
    box-shadow: var(--shadow-sm);
    padding: clamp(18px, 3vw, 28px);
}
.shift-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 14px;
}
.shift-grid section {
    border-radius: 14px;
    border: 1px solid var(--line);
    background: var(--bg);
    padding: 16px 18px;
    box-shadow: var(--shadow-xs);
    display: flex;
    flex-direction: column;
}
.shift-grid section h2 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.96rem;
    font-weight: 750;
    margin-bottom: 12px;
}
.shift-step-n {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: 7px;
    background: rgba(var(--accent-rgb), 0.14);
    color: var(--brand-2);
    font-size: 0.76rem;
    font-weight: 750;
    flex: none;
}
.shift-grid section.shift-red {
    border-left: 4px solid var(--critical);
    background: color-mix(in srgb, var(--critical) 4%, var(--card));
}
.shift-grid section.shift-red .shift-step-n {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
}
.shift-grid section.shift-crit {
    border-left: 4px solid var(--emergent);
    background: color-mix(in srgb, var(--emergent) 4%, var(--card));
}
.shift-grid section.shift-crit .shift-step-n {
    background: rgba(249, 115, 22, 0.15);
    color: #ea580c;
}
.shift-grid section.shift-disposition {
    border-left: 4px solid var(--common);
    background: color-mix(in srgb, var(--common) 4%, var(--card));
}

/* ── Content grids optimal filling without wasted space ── */
.cluster-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 12px;
}
.cluster {
    border-radius: 12px;
    border: 1px solid var(--line);
    background: var(--bg);
    padding: 14px 16px;
    box-shadow: var(--shadow-xs);
}
.wu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 12px;
}
.wu-col {
    border-radius: 12px;
    border: 1px solid var(--line);
    background: var(--bg);
    padding: 14px 16px;
    box-shadow: var(--shadow-xs);
}
.disp-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
}
.pp-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 14px;
}

/* ══════════════════════════════════════════════════════════════════
   Apple iOS 27 Design System — Refractive Liquid Glass & Haptics
   ──────────────────────────────────────────────────────────────────
   Ultra-modern floating glassmorphism, continuous squircle curvature,
   chromatic aura glow, isolated navigation hierarchy, and tactile feel.
   ══════════════════════════════════════════════════════════════════ */

/* ── 1. Isolated Top Navigation Row ── */
.cp-hero-nav {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    margin-bottom: 12px;
    padding: 2px 2px;
}
.ios-nav-back,
.cp-hero-nav .back-btn,
.study-page-head .back-btn,
.shift-topline .back-btn {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 7px 15px 7px 11px;
    border-radius: 999px;
    background: rgba(var(--card-rgb, 255, 255, 255), 0.72);
    -webkit-backdrop-filter: blur(24px) saturate(190%);
    backdrop-filter: blur(24px) saturate(190%);
    border: 1px solid var(--line);
    color: var(--brand-2);
    font-size: 0.82rem;
    font-weight: 650;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), background 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
    margin: 0;
}
.ios-nav-back .ios-back-ico,
.back-btn .ios-back-ico {
    flex: none;
    color: currentColor;
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.ios-nav-back:hover,
.cp-hero-nav .back-btn:hover,
.study-page-head .back-btn:hover,
.shift-topline .back-btn:hover {
    background: var(--card);
    border-color: var(--hover-line);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
}
.ios-nav-back:hover .ios-back-ico,
.back-btn:hover .ios-back-ico {
    transform: translateX(-2px);
}
.ios-nav-back:active,
.back-btn:active {
    transform: scale(0.96);
}

/* ── 2. Unified Hero Card: Refractive Liquid Glass ── */
.cp-hero {
    position: relative;
    margin-bottom: 22px;
    padding: 24px 28px 22px;
    border-radius: 22px;
    overflow: hidden;
    background: linear-gradient(140deg,
        rgba(var(--cat-rgb, var(--accent-rgb)), 0.15) 0%,
        rgba(var(--cat-rgb, var(--accent-rgb)), 0.03) 50%,
        rgba(var(--card-rgb, 255, 255, 255), 0.85) 90%),
        var(--card);
    -webkit-backdrop-filter: blur(28px) saturate(200%);
    backdrop-filter: blur(28px) saturate(200%);
    border: 1px solid color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 28%, var(--line));
    box-shadow:
        0 16px 42px -10px rgba(var(--cat-rgb, var(--accent-rgb)), 0.24),
        0 2px 8px rgba(0, 0, 0, 0.03),
        inset 0 1px 0 rgba(255, 255, 255, 0.65);
    transition: box-shadow 0.3s ease, border-color 0.3s ease;
}
.cp-hero::after {
    content: "";
    position: absolute;
    inset-block-start: 0;
    inset-inline: 0;
    height: 3px;
    background: linear-gradient(90deg, rgb(var(--cat, 15, 157, 118)) 0%, color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 55%, var(--accent-2)) 100%);
    opacity: 0.9;
}
html[data-theme="dark"] .cp-hero {
    background: linear-gradient(140deg,
        rgba(var(--cat-rgb, var(--accent-rgb)), 0.22) 0%,
        rgba(var(--cat-rgb, var(--accent-rgb)), 0.06) 55%,
        rgba(26, 30, 36, 0.85) 95%),
        var(--card);
    border-color: color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 40%, rgba(255, 255, 255, 0.15));
    box-shadow:
        0 18px 46px -10px rgba(0, 0, 0, 0.55),
        0 0 0 1px rgba(255, 255, 255, 0.08) inset;
}

/* ── 3. Hero Content Geometry: Squircle + Title Integration ── */
.cp-hero-inner {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 12px;
}
.cp-hero .cp-ico-lg {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    padding: 0;
    margin: 0;
    flex: none;
    border-radius: 18px;
    background: linear-gradient(135deg,
        rgba(var(--cat-rgb, var(--accent-rgb)), 0.28) 0%,
        rgba(var(--cat-rgb, var(--accent-rgb)), 0.12) 100%);
    border: 1px solid color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 45%, transparent);
    box-shadow:
        0 8px 22px -3px rgba(var(--cat-rgb, var(--accent-rgb)), 0.36),
        inset 0 1px 1px rgba(255, 255, 255, 0.65);
    transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.cp-hero:hover .cp-ico-lg {
    transform: scale(1.05) rotate(-1deg);
}
.cp-hero .cp-ico-lg .color-ico,
.cp-hero .cp-ico-lg .mono-ico {
    width: 36px;
    height: 36px;
}
.cp-hero-text {
    flex: 1;
    min-width: 0;
}
.cp-hero-badge-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 5px;
    flex-wrap: wrap;
}
.cp-cat-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 3px 11px;
    border-radius: 999px;
    font-size: 0.72rem;
    font-weight: 750;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    background: rgba(var(--cat-rgb, var(--accent-rgb)), 0.15);
    color: var(--brand-2);
    border: 1px solid rgba(var(--cat-rgb, var(--accent-rgb)), 0.30);
}
.cp-cat-badge::before {
    content: "";
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor;
    box-shadow: 0 0 6px currentColor;
}
.cp-hero h1 {
    font-size: clamp(1.7rem, 4vw, 2.35rem);
    font-weight: 800;
    letter-spacing: -0.038em;
    line-height: 1.15;
    color: var(--ink);
    margin: 0;
}
.cp-hero .tag {
    font-size: 0.96rem;
    line-height: 1.6;
    color: var(--ink-soft);
    margin: 0;
    max-width: 70ch;
}
.cp-hero .ecg-subhead {
    font-size: 0.88rem;
    line-height: 1.55;
    color: var(--ink-soft);
    margin-top: 6px;
}

/* ── 4. Student Learning & Quick Action Glass Bar ── */
.student-intro {
    border-radius: 20px;
    border: 1px solid var(--line);
    background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.06) 0%, var(--card) 100%);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-sm);
    padding: 18px 22px;
    margin: 16px 0 20px;
}
.student-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 8px 0 14px;
    flex-wrap: wrap;
}
.student-actions strong {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--ink-soft);
    font-weight: 750;
    margin-right: 2px;
}
.student-actions a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 44px;
    padding: 8px 20px;
    border-radius: 999px;
    font-size: 0.88rem;
    font-weight: 650;
    text-decoration: none;
    border: 1px solid var(--line);
    background: var(--card);
    color: var(--ink);
    box-shadow: var(--shadow-xs);
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.2s ease, background 0.2s ease;
}
.student-actions a:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}
.student-actions a:active {
    transform: scale(0.97);
}
.student-actions a:first-of-type {
    background: linear-gradient(135deg, var(--brand-2) 0%, var(--brand) 100%);
    color: #fff;
    border-color: transparent;
    box-shadow: 0 4px 16px rgba(var(--accent-rgb), 0.38);
}
.student-actions a:first-of-type:hover {
    box-shadow: 0 6px 20px rgba(var(--accent-rgb), 0.48);
}

/* ── 5. Responsive Perfection for Mobile (e.g. 438px) ── */
@media (max-width: 600px) {
    .cp-hero {
        padding: 16px 18px;
        border-radius: 18px;
        margin-bottom: 16px;
    }
    .cp-hero-inner {
        gap: 14px;
        margin-bottom: 10px;
    }
    .cp-hero .cp-ico-lg {
        width: 52px;
        height: 52px;
        border-radius: 15px;
    }
    .cp-hero .cp-ico-lg .color-ico,
    .cp-hero .cp-ico-lg .mono-ico {
        width: 32px;
        height: 32px;
    }
    .cp-hero h1 {
        font-size: 1.58rem;
    }
    .cp-hero .tag {
        font-size: 0.90rem;
    }
    .student-actions a {
        flex: 1 1 calc(50% - 6px);
        min-height: 42px;
        padding-inline: 12px;
        text-align: center;
        font-size: 0.84rem;
    }
    .ios-nav-back,
    .cp-hero-nav .back-btn {
        min-height: 36px;
        padding: 5px 13px 5px 9px;
        font-size: 0.80rem;
    }
}

/* ══════════════════════════════════════════════════════════════════
   Apple iOS 27 Complete System — Harmonizing All 5 Header Pages
   ──────────────────────────────────────────────────────────────────
   1 · Topbar & Primary Nav (Segmented Glass Island)
   2 · Page 1: Presentations (Home Hero, Entry Cards & Library)
   3 · Page 2: Practice (Simulated Clinical Workspace & Study Page)
   4 · Page 3: ECG Guide (Step Navigation, Rail & Patterns)
   5 · Page 4: ECG Explorer (Floating Glass Controls & Paper Canvas)
   6 · Page 5: Shift View (Focused Liquid Glass Clinical Sheet)
   ══════════════════════════════════════════════════════════════════ */

/* ── I. Topbar & Primary Navigation (Segmented Glass Island) ── */
.topbar {
    background: rgba(var(--card-rgb, 255, 255, 255), 0.76) !important;
    -webkit-backdrop-filter: blur(28px) saturate(200%) !important;
    backdrop-filter: blur(28px) saturate(200%) !important;
    border-bottom: 1px solid var(--line) !important;
}
html[data-theme="dark"] .topbar {
    background: rgba(18, 21, 26, 0.78) !important;
    border-bottom-color: rgba(255, 255, 255, 0.10) !important;
}
/* Desktop Primary Nav (Horizontal Glass Segmented Island) */
@media (min-width: 921px) {
    .primary-nav {
        display: inline-flex !important;
        align-items: center !important;
        background: color-mix(in srgb, var(--ink) 4%, transparent) !important;
        border: 1px solid color-mix(in srgb, var(--ink) 8%, transparent) !important;
        border-radius: 999px !important;
        padding: 3px !important;
        gap: 3px !important;
    }
    .primary-nav .home-btn {
        display: inline-flex !important;
        flex-direction: row !important;
        align-items: center !important;
        justify-content: center !important;
        border-radius: 999px !important;
        padding: 7px 14px !important;
        font-size: 0.82rem !important;
        font-weight: 600 !important;
        color: var(--ink-soft) !important;
        background: transparent !important;
        border: 1px solid transparent !important;
        box-shadow: none !important;
        gap: 6px !important;
        width: auto !important;
        height: auto !important;
        min-height: 38px !important;
        transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1) !important;
    }
    .primary-nav .home-btn .header-label {
        display: inline !important;
    }
    .primary-nav .home-btn:hover {
        background: color-mix(in srgb, var(--ink) 6%, transparent) !important;
        color: var(--ink) !important;
        transform: translateY(-1px);
    }
    .primary-nav .home-btn:active {
        transform: scale(0.96) !important;
    }
    .primary-nav .home-btn.active-nav,
    .primary-nav .home-btn[aria-current="page"],
    html[data-theme] .primary-nav .home-btn.active-nav {
        background: var(--card) !important;
        color: var(--brand-2) !important;
        border-color: color-mix(in srgb, var(--brand-2) 24%, transparent) !important;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08), 0 0 0 1px color-mix(in srgb, var(--brand-2) 20%, transparent) !important;
        font-weight: 750 !important;
    }
    html[data-theme="dark"] .primary-nav .home-btn.active-nav,
    html[data-theme="dark"] .primary-nav .home-btn[aria-current="page"] {
        background: var(--card-elevated, #242930) !important;
        color: var(--accent) !important;
        border-color: rgba(var(--accent-rgb), 0.35) !important;
        box-shadow: 0 2px 12px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(var(--accent-rgb), 0.35) !important;
        font-weight: 750 !important;
    }
}

/* Mobile & Tablet Primary Nav (iOS 27 Liquid Glass 5-Column Segmented Tab Bar) */
@media (max-width: 920px) {
    .topbar {
        display: grid !important;
        grid-template-columns: 44px minmax(0, 1fr) 44px !important;
        grid-template-rows: 44px auto !important;
        padding: max(10px, env(safe-area-inset-top, 10px)) 12px 10px !important;
        gap: 8px 8px !important;
        align-items: center !important;
    }
    .topbar > .burger {
        grid-column: 1 !important;
        grid-row: 1 !important;
        width: 44px !important;
        min-width: 44px !important;
        height: 44px !important;
        display: inline-flex !important;
        align-items: center !important;
        justify-content: center !important;
        border-radius: 12px !important;
        background: color-mix(in srgb, var(--ink) 4%, transparent) !important;
        border: 1px solid color-mix(in srgb, var(--ink) 8%, transparent) !important;
        color: var(--ink) !important;
        box-shadow: none !important;
        padding: 0 !important;
        cursor: pointer !important;
    }
    .topbar > .searchwrap {
        grid-column: 2 !important;
        grid-row: 1 !important;
        min-height: 44px !important;
        height: 44px !important;
        border-radius: 12px !important;
        max-width: none !important;
        margin: 0 !important;
    }
    .topbar > .tools-toggle {
        grid-column: 3 !important;
        grid-row: 1 !important;
        width: 44px !important;
        min-width: 44px !important;
        height: 44px !important;
        display: inline-flex !important;
        align-items: center !important;
        justify-content: center !important;
        border-radius: 12px !important;
        background: color-mix(in srgb, var(--ink) 4%, transparent) !important;
        border: 1px solid color-mix(in srgb, var(--ink) 8%, transparent) !important;
        color: var(--ink) !important;
        box-shadow: none !important;
        padding: 0 !important;
        cursor: pointer !important;
    }
    .topbar > .tools-toggle .header-label {
        display: none !important;
    }
    .topbar > .primary-nav {
        grid-column: 1 / -1 !important;
        grid-row: 2 !important;
        display: grid !important;
        grid-template-columns: repeat(5, minmax(0, 1fr)) !important;
        width: 100% !important;
        box-sizing: border-box !important;
        background: color-mix(in srgb, var(--ink) 5%, transparent) !important;
        border: 1px solid color-mix(in srgb, var(--ink) 8%, transparent) !important;
        border-radius: 16px !important;
        padding: 3px !important;
        gap: 2px !important;
        align-items: stretch !important;
        -webkit-backdrop-filter: blur(20px) !important;
        backdrop-filter: blur(20px) !important;
    }
    .topbar > .primary-nav > :is(#homeBtn, #studyBtn, #shiftBtn, #ecgBtn, #explorerBtn),
    .primary-nav .home-btn {
        display: flex !important;
        flex-direction: column !important;
        align-items: center !important;
        justify-content: center !important;
        gap: 2px !important;
        width: 100% !important;
        min-width: 0 !important;
        max-width: 100% !important;
        height: auto !important;
        min-height: 52px !important;
        padding: 4px 1px !important;
        border-radius: 12px !important;
        background: transparent !important;
        border: 1px solid transparent !important;
        color: var(--ink-soft) !important;
        box-shadow: none !important;
        cursor: pointer !important;
        flex: 1 1 0% !important;
        transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1) !important;
    }
    .topbar > .primary-nav .ui-icon {
        display: block !important;
        width: 19px !important;
        height: 19px !important;
        flex: none !important;
        stroke-width: 1.8 !important;
    }
    .topbar > .primary-nav .header-label {
        display: block !important;
        font-size: min(0.66rem, 11px) !important;
        font-weight: 600 !important;
        line-height: 1.15 !important;
        letter-spacing: -0.01em !important;
        text-align: center !important;
        white-space: nowrap !important;
        overflow: hidden !important;
        text-overflow: ellipsis !important;
        max-width: 100% !important;
        width: 100% !important;
        margin: 0 !important;
        padding: 0 !important;
    }
    .topbar > .primary-nav > :is(#homeBtn, #studyBtn, #shiftBtn, #ecgBtn, #explorerBtn):active {
        transform: scale(0.95) !important;
    }
    .topbar > .primary-nav > :is(#homeBtn, #studyBtn, #shiftBtn, #ecgBtn, #explorerBtn).active-nav,
    .topbar > .primary-nav > :is(#homeBtn, #studyBtn, #shiftBtn, #ecgBtn, #explorerBtn)[aria-current="page"],
    html[data-theme] .topbar > .primary-nav > :is(#homeBtn, #studyBtn, #shiftBtn, #ecgBtn, #explorerBtn).active-nav {
        background: var(--card) !important;
        color: var(--brand-2) !important;
        border-color: color-mix(in srgb, var(--brand-2) 24%, transparent) !important;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08), 0 0 0 1px color-mix(in srgb, var(--brand-2) 20%, transparent) !important;
        font-weight: 750 !important;
    }
    html[data-theme="dark"] .topbar > .primary-nav > :is(#homeBtn, #studyBtn, #shiftBtn, #ecgBtn, #explorerBtn).active-nav,
    html[data-theme="dark"] .topbar > .primary-nav > :is(#homeBtn, #studyBtn, #shiftBtn, #ecgBtn, #explorerBtn)[aria-current="page"] {
        background: var(--card-elevated, #242930) !important;
        color: var(--accent) !important;
        border-color: rgba(var(--accent-rgb), 0.35) !important;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(var(--accent-rgb), 0.35) !important;
        font-weight: 750 !important;
    }
}

/* ── II. Page 1: Presentations (Home Hero & Entry Cards) ── */
.home-intro {
    position: relative !important;
    margin-bottom: 26px !important;
    padding: clamp(24px, 4vw, 36px) clamp(22px, 4vw, 38px) !important;
    border-radius: 24px !important;
    overflow: hidden !important;
    background: linear-gradient(140deg,
        rgba(var(--accent-rgb), 0.14) 0%,
        rgba(var(--accent-rgb), 0.03) 50%,
        rgba(var(--card-rgb, 255, 255, 255), 0.88) 95%),
        var(--card) !important;
    -webkit-backdrop-filter: blur(28px) saturate(200%) !important;
    backdrop-filter: blur(28px) saturate(200%) !important;
    border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--line)) !important;
    box-shadow:
        0 18px 46px -10px rgba(var(--accent-rgb), 0.22),
        0 2px 8px rgba(0, 0, 0, 0.03),
        inset 0 1px 0 rgba(255, 255, 255, 0.7) !important;
    transition: box-shadow 0.3s ease, border-color 0.3s ease;
}
.home-intro::after {
    display: block !important;
    content: "" !important;
    position: absolute !important;
    inset-block-start: 0 !important;
    inset-inline: 0 !important;
    height: 3px !important;
    background: linear-gradient(90deg, var(--accent) 0%, var(--accent-2) 100%) !important;
    opacity: 0.9 !important;
}
html[data-theme="dark"] .home-intro {
    background: linear-gradient(140deg,
        rgba(var(--accent-rgb), 0.22) 0%,
        rgba(var(--accent-rgb), 0.05) 55%,
        rgba(26, 30, 36, 0.88) 95%),
        var(--card) !important;
    border-color: color-mix(in srgb, var(--accent) 40%, rgba(255, 255, 255, 0.15)) !important;
    box-shadow:
        0 18px 46px -10px rgba(0, 0, 0, 0.55),
        0 0 0 1px rgba(255, 255, 255, 0.08) inset !important;
}
.home-intro > span.study-kicker {
    display: inline-flex !important;
    align-items: center !important;
    gap: 7px !important;
    padding: 4px 13px !important;
    border-radius: 999px !important;
    background: rgba(var(--accent-rgb), 0.15) !important;
    color: var(--brand-2) !important;
    border: 1px solid rgba(var(--accent-rgb), 0.28) !important;
    font-size: 0.72rem !important;
    font-weight: 750 !important;
    letter-spacing: 0.08em !important;
    text-transform: uppercase !important;
}
.home-intro > span.study-kicker::before {
    content: "" !important;
    width: 6px !important;
    height: 6px !important;
    border-radius: 50% !important;
    background: var(--accent) !important;
    box-shadow: 0 0 8px var(--accent) !important;
}
.home-intro h1 {
    font-size: clamp(2rem, 4vw, 2.9rem) !important;
    font-weight: 800 !important;
    letter-spacing: -0.04em !important;
    line-height: 1.12 !important;
    color: var(--ink) !important;
    margin: 12px 0 14px !important;
    max-width: 20ch !important;
}
.home-intro p {
    font-size: 1.02rem !important;
    line-height: 1.62 !important;
    color: var(--ink-soft) !important;
    max-width: 58ch !important;
    margin: 0 0 20px !important;
}
.home-actions {
    display: flex !important;
    align-items: center !important;
    gap: 12px !important;
    margin-top: 18px !important;
    flex-wrap: wrap !important;
}
.home-actions .home-start {
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 8px !important;
    min-height: 46px !important;
    padding: 10px 24px !important;
    border-radius: 999px !important;
    background: linear-gradient(135deg, var(--brand-2) 0%, var(--brand) 100%) !important;
    color: #fff !important;
    font-size: 0.90rem !important;
    font-weight: 700 !important;
    border: 0 !important;
    box-shadow: 0 4px 18px rgba(var(--accent-rgb), 0.38) !important;
    cursor: pointer !important;
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.2s ease !important;
}
.home-actions .home-start:hover {
    transform: translateY(-2px) !important;
    box-shadow: 0 6px 22px rgba(var(--accent-rgb), 0.48) !important;
}
.home-actions .home-start:active {
    transform: scale(0.96) !important;
}
.home-actions .home-ecg {
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 8px !important;
    min-height: 46px !important;
    padding: 10px 22px !important;
    border-radius: 999px !important;
    background: rgba(var(--card-rgb, 255, 255, 255), 0.72) !important;
    -webkit-backdrop-filter: blur(16px) !important;
    backdrop-filter: blur(16px) !important;
    border: 1px solid var(--line) !important;
    color: var(--ink) !important;
    font-size: 0.90rem !important;
    font-weight: 650 !important;
    box-shadow: var(--shadow-xs) !important;
    cursor: pointer !important;
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), background 0.15s ease, border-color 0.15s ease !important;
}
.home-actions .home-ecg:hover {
    background: var(--card) !important;
    border-color: var(--hover-line) !important;
    transform: translateY(-1px) !important;
    box-shadow: var(--shadow-sm) !important;
}
.home-actions .home-ecg:active {
    transform: scale(0.96) !important;
}
.home-meta {
    display: flex !important;
    align-items: center !important;
    gap: 8px 12px !important;
    margin-top: 20px !important;
    padding-top: 14px !important;
    border-top: 1px solid color-mix(in srgb, var(--line) 60%, transparent) !important;
    flex-wrap: wrap !important;
}
.home-meta span {
    display: inline-flex !important;
    align-items: center !important;
    gap: 6px !important;
    padding: 4px 12px !important;
    border-radius: 999px !important;
    background: rgba(var(--card-rgb, 255, 255, 255), 0.60) !important;
    border: 1px solid var(--line) !important;
    font-size: 0.78rem !important;
    font-weight: 650 !important;
    color: var(--ink-soft) !important;
    backdrop-filter: blur(12px) !important;
}

/* ── 3 Workspace Entry Pathway Cards ── */
.workspace-entry {
    display: grid !important;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)) !important;
    gap: 16px !important;
    margin: 22px 0 28px !important;
}
.workspace-entry > a {
    display: block !important;
    padding: 22px 24px !important;
    border-radius: 20px !important;
    background: var(--card) !important;
    border: 1px solid var(--line) !important;
    box-shadow: var(--shadow-sm) !important;
    text-decoration: none !important;
    position: relative !important;
    overflow: hidden !important;
    transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.25s ease, border-color 0.2s ease !important;
}
.workspace-entry > a:hover {
    transform: translateY(-3px) scale(1.008) !important;
    box-shadow: var(--shadow-md) !important;
    border-color: var(--hover-line) !important;
}
.workspace-entry > a:active {
    transform: scale(0.98) !important;
}
.workspace-entry > a > span:first-child {
    display: inline-flex !important;
    align-items: center !important;
    gap: 6px !important;
    padding: 3px 10px !important;
    border-radius: 999px !important;
    background: rgba(var(--accent-rgb), 0.12) !important;
    color: var(--brand-2) !important;
    font-size: 0.72rem !important;
    font-weight: 750 !important;
    letter-spacing: 0.06em !important;
    text-transform: uppercase !important;
    margin-bottom: 10px !important;
}
.workspace-entry > a > strong {
    display: block !important;
    font-size: 1.15rem !important;
    font-weight: 750 !important;
    letter-spacing: -0.025em !important;
    color: var(--ink) !important;
    line-height: 1.3 !important;
    margin-bottom: 8px !important;
}
.workspace-entry > a > p {
    font-size: 0.88rem !important;
    line-height: 1.55 !important;
    color: var(--ink-soft) !important;
    margin: 0 !important;
}

/* ── III. Page 2: Practice & Learning Workspace ── */
.learning-workspace,
.study-page {
    max-width: 1040px !important;
    margin: 0 auto !important;
}
@media (min-width: 921px) {
    .learning-workspace,
    .study-page {
        border-radius: 24px !important;
        background: linear-gradient(140deg,
            rgba(var(--accent-rgb), 0.08) 0%,
            rgba(var(--accent-rgb), 0.02) 50%,
            rgba(var(--card-rgb, 255, 255, 255), 0.88) 95%),
            var(--card) !important;
        -webkit-backdrop-filter: blur(28px) saturate(200%) !important;
        backdrop-filter: blur(28px) saturate(200%) !important;
        border: 1px solid color-mix(in srgb, var(--accent) 24%, var(--line)) !important;
        box-shadow:
            0 18px 46px -10px rgba(var(--accent-rgb), 0.16),
            0 2px 8px rgba(0, 0, 0, 0.03),
            inset 0 1px 0 rgba(255, 255, 255, 0.7) !important;
        padding: clamp(24px, 4vw, 36px) !important;
    }
    html[data-theme="dark"] .learning-workspace,
    html[data-theme="dark"] .study-page {
        background: linear-gradient(140deg,
            rgba(var(--accent-rgb), 0.18) 0%,
            rgba(var(--accent-rgb), 0.04) 55%,
            rgba(26, 30, 36, 0.88) 95%),
            var(--card) !important;
        border-color: color-mix(in srgb, var(--accent) 35%, rgba(255, 255, 255, 0.12)) !important;
        box-shadow:
            0 18px 46px -10px rgba(0, 0, 0, 0.55),
            0 0 0 1px rgba(255, 255, 255, 0.08) inset !important;
    }
}
@media (max-width: 920px) {
    .learning-workspace,
    .study-page {
        background: transparent !important;
        border: none !important;
        box-shadow: none !important;
        padding: 0 !important;
    }
}
.workspace-hero-nav {
    margin-bottom: 12px !important;
}
.workspace-tabs,
.study-tabs {
    display: flex !important;
    flex-wrap: nowrap !important;
    overflow-x: auto !important;
    -webkit-overflow-scrolling: touch !important;
    scrollbar-width: none !important;
    gap: 4px !important;
    padding: 4px !important;
    background: color-mix(in srgb, var(--ink) 5%, transparent) !important;
    border: 1px solid color-mix(in srgb, var(--ink) 8%, transparent) !important;
    border-radius: 14px !important;
    margin: 14px 0 20px !important;
}
.workspace-tabs::-webkit-scrollbar,
.study-tabs::-webkit-scrollbar {
    display: none !important;
}
.workspace-tabs a,
.study-tabs button {
    flex: 1 1 0% !important;
    min-width: max-content !important;
    padding: 9px 16px !important;
    border-radius: 11px !important;
    font-size: 0.82rem !important;
    font-weight: 650 !important;
    color: var(--ink-soft) !important;
    text-decoration: none !important;
    border: 0 !important;
    background: transparent !important;
    transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1) !important;
    cursor: pointer !important;
    white-space: nowrap !important;
    text-align: center !important;
    justify-content: center !important;
}
.workspace-tabs a:hover,
.study-tabs button:hover {
    color: var(--ink) !important;
}
.workspace-tabs a:active,
.study-tabs button:active {
    transform: scale(0.96) !important;
}
.workspace-tabs a[aria-current="page"],
.study-tabs button.active,
.study-tabs button[aria-current="page"] {
    background: var(--card) !important;
    color: var(--brand-2) !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08), 0 0 0 1px color-mix(in srgb, var(--brand-2) 18%, transparent) !important;
    font-weight: 750 !important;
}
html[data-theme="dark"] .workspace-tabs a[aria-current="page"],
html[data-theme="dark"] .study-tabs button.active,
html[data-theme="dark"] .study-tabs button[aria-current="page"] {
    background: var(--card-elevated, #242930) !important;
    color: var(--accent) !important;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.35), 0 0 0 1px rgba(var(--accent-rgb), 0.3) !important;
}

/* Practice Filter Bar & Session Note */
.workspace-filter-bar {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    gap: 12px !important;
    margin: 16px 0 10px !important;
}
.workspace-filter-bar .filter-label {
    font-size: 0.76rem !important;
    font-weight: 750 !important;
    letter-spacing: 0.05em !important;
    text-transform: uppercase !important;
    color: var(--ink-soft) !important;
    white-space: nowrap !important;
}
.workspace-filter-bar .select-wrap {
    position: relative !important;
    flex: 1 !important;
    max-width: 260px !important;
}
.workspace-filter-bar select {
    width: 100% !important;
    padding: 9px 36px 9px 14px !important;
    font-size: 0.82rem !important;
    font-weight: 600 !important;
    border-radius: 12px !important;
    background: var(--card) !important;
    color: var(--ink) !important;
    border: 1px solid var(--line) !important;
    appearance: none !important;
    -webkit-appearance: none !important;
    cursor: pointer !important;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.03) !important;
    transition: border-color 0.2s ease !important;
}
.workspace-filter-bar select:focus {
    border-color: var(--brand-2) !important;
    outline: none !important;
}
.workspace-filter-bar .select-arrow {
    position: absolute !important;
    right: 12px !important;
    top: 50% !important;
    transform: translateY(-50%) !important;
    width: 16px !important;
    height: 16px !important;
    pointer-events: none !important;
    stroke: var(--ink-soft) !important;
}
.workspace-session-note {
    display: flex !important;
    align-items: center !important;
    gap: 7px !important;
    font-size: 0.76rem !important;
    color: var(--ink-soft) !important;
    margin: 6px 0 18px !important;
    line-height: 1.4 !important;
}
.workspace-session-note .ui-icon {
    width: 15px !important;
    height: 15px !important;
    flex: none !important;
    stroke: var(--brand-2) !important;
}

/* Practice Evolving Case Cards */
.workspace-grid {
    display: grid !important;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)) !important;
    gap: 14px !important;
    margin: 14px 0 24px !important;
}
@media (max-width: 700px) {
    .workspace-grid {
        grid-template-columns: 1fr !important;
        gap: 12px !important;
    }
    .workspace-filter-bar {
        flex-direction: column !important;
        align-items: stretch !important;
        gap: 6px !important;
    }
    .workspace-filter-bar .select-wrap {
        max-width: 100% !important;
    }
}
.workspace-card {
    display: flex !important;
    flex-direction: column !important;
    border-radius: 20px !important;
    border: 1px solid var(--line) !important;
    background: rgba(var(--card-rgb, 255, 255, 255), 0.85) !important;
    -webkit-backdrop-filter: blur(20px) !important;
    backdrop-filter: blur(20px) !important;
    padding: 18px 20px !important;
    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.03), inset 0 1px 0 rgba(255, 255, 255, 0.7) !important;
    transition: all 0.22s cubic-bezier(0.34, 1.56, 0.64, 1) !important;
    text-decoration: none !important;
    cursor: pointer !important;
    min-width: 0 !important;
}
html[data-theme="dark"] .workspace-card {
    background: rgba(26, 30, 36, 0.85) !important;
    border-color: rgba(255, 255, 255, 0.08) !important;
    box-shadow: 0 3px 16px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.05) !important;
}
.workspace-card:hover {
    transform: translateY(-2px) !important;
    border-color: color-mix(in srgb, var(--brand-2) 35%, var(--line)) !important;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06) !important;
}
.workspace-card:active {
    transform: scale(0.98) !important;
}
.workspace-card-top {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    gap: 8px !important;
    margin-bottom: 8px !important;
}
.workspace-card .study-kicker {
    font-size: 0.68rem !important;
    font-weight: 750 !important;
    letter-spacing: 0.06em !important;
    color: var(--brand-2) !important;
    text-transform: uppercase !important;
    padding: 3px 8px !important;
    border-radius: 6px !important;
    background: rgba(var(--accent-rgb), 0.12) !important;
    margin: 0 !important;
}
.workspace-card .case-badge {
    font-size: 0.68rem !important;
    font-weight: 600 !important;
    color: var(--ink-soft) !important;
    padding: 3px 8px !important;
    border-radius: 999px !important;
    background: color-mix(in srgb, var(--ink) 6%, transparent) !important;
    white-space: nowrap !important;
}
.workspace-card .case-badge.badge-progress {
    background: rgba(var(--accent-rgb), 0.15) !important;
    color: var(--brand-2) !important;
    font-weight: 700 !important;
}
.workspace-card .case-badge.badge-done {
    background: rgba(16, 185, 129, 0.15) !important;
    color: #059669 !important;
    font-weight: 700 !important;
}
.workspace-card h2 {
    font-size: 1.15rem !important;
    font-weight: 700 !important;
    letter-spacing: -0.025em !important;
    color: var(--ink) !important;
    margin: 4px 0 6px !important;
    line-height: 1.35 !important;
}
.workspace-card .case-desc {
    font-size: 0.82rem !important;
    color: var(--ink-soft) !important;
    line-height: 1.45 !important;
    margin: 0 0 14px !important;
}
.workspace-card .case-cta {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    margin-top: auto !important;
    padding-top: 12px !important;
    border-top: 1px solid var(--line) !important;
    font-size: 0.82rem !important;
    font-weight: 650 !important;
    color: var(--brand-2) !important;
}
.workspace-card .case-cta .cta-arrow {
    transition: transform 0.2s ease !important;
    font-size: 0.95rem !important;
}
.workspace-card:hover .cta-arrow {
    transform: translateX(3px) !important;
}
.workspace-card > span:last-child {
    text-decoration: none !important;
}

/* ── IV. Page 3: ECG Guide (Step Slider & Rails) ── */
.ecg-step-nav {
    display: flex !important;
    gap: 5px !important;
    padding: 5px !important;
    background: color-mix(in srgb, var(--ink) 4%, transparent) !important;
    border: 1px solid color-mix(in srgb, var(--ink) 8%, transparent) !important;
    border-radius: 999px !important;
    margin: 16px 0 22px !important;
    overflow-x: auto !important;
}
.ecg-step-chip {
    padding: 7px 16px !important;
    border-radius: 999px !important;
    font-size: 0.82rem !important;
    font-weight: 650 !important;
    border: 1px solid transparent !important;
    background: transparent !important;
    color: var(--ink-soft) !important;
    cursor: pointer !important;
    transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1) !important;
    white-space: nowrap !important;
}
.ecg-step-chip:hover {
    background: var(--card) !important;
    color: var(--brand-2) !important;
    border-color: var(--line) !important;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04) !important;
}
.ecg-step-chip:active {
    transform: scale(0.96) !important;
}

/* ── V. Page 4: ECG Explorer (Glass Controls & Waveform Paper) ── */
.explorer-controls {
    display: flex !important;
    align-items: center !important;
    flex-wrap: wrap !important;
    gap: 10px !important;
    padding: 14px 18px !important;
    border-radius: 18px !important;
    background: rgba(var(--card-rgb, 255, 255, 255), 0.78) !important;
    -webkit-backdrop-filter: blur(28px) saturate(200%) !important;
    backdrop-filter: blur(28px) saturate(200%) !important;
    border: 1px solid var(--line) !important;
    box-shadow: var(--shadow-sm) !important;
    margin-bottom: 16px !important;
}
.explorer-controls select {
    border-radius: 12px !important;
    background: var(--card) !important;
    border: 1px solid var(--line) !important;
    padding: 8px 14px !important;
    font-weight: 600 !important;
    font-size: 0.84rem !important;
    color: var(--ink) !important;
}
.ex-button {
    border-radius: 999px !important;
    padding: 8px 18px !important;
    font-weight: 650 !important;
    font-size: 0.82rem !important;
    border: 1px solid var(--line) !important;
    background: var(--card) !important;
    color: var(--ink) !important;
    cursor: pointer !important;
    box-shadow: var(--shadow-xs) !important;
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.2s ease !important;
}
.ex-button:hover {
    transform: translateY(-1px) !important;
    border-color: var(--hover-line) !important;
    box-shadow: var(--shadow-sm) !important;
}
.ex-button:active {
    transform: scale(0.96) !important;
}
.ex-primary,
.explorer-heading > .ex-button {
    background: linear-gradient(135deg, var(--brand-2) 0%, var(--brand) 100%) !important;
    color: #fff !important;
    border-color: transparent !important;
    box-shadow: 0 4px 16px rgba(var(--accent-rgb), 0.35) !important;
}

/* ── VI. Page 5: Shift View (Focused Liquid Glass Sheet) ── */
.shift-sheet {
    border-radius: 24px !important;
    background: linear-gradient(140deg,
        rgba(var(--cat-rgb, var(--accent-rgb)), 0.15) 0%,
        rgba(var(--cat-rgb, var(--accent-rgb)), 0.03) 50%,
        rgba(var(--card-rgb, 255, 255, 255), 0.88) 95%),
        var(--card) !important;
    -webkit-backdrop-filter: blur(28px) saturate(200%) !important;
    backdrop-filter: blur(28px) saturate(200%) !important;
    border: 1px solid color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 30%, var(--line)) !important;
    box-shadow:
        0 18px 46px -10px rgba(var(--cat-rgb, var(--accent-rgb)), 0.24),
        0 2px 8px rgba(0, 0, 0, 0.03),
        inset 0 1px 0 rgba(255, 255, 255, 0.7) !important;
    padding: clamp(22px, 4vw, 36px) !important;
}
html[data-theme="dark"] .shift-sheet {
    background: linear-gradient(140deg,
        rgba(var(--cat-rgb, var(--accent-rgb)), 0.22) 0%,
        rgba(var(--cat-rgb, var(--accent-rgb)), 0.05) 55%,
        rgba(26, 30, 36, 0.88) 95%),
        var(--card) !important;
    border-color: color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 40%, rgba(255, 255, 255, 0.15)) !important;
    box-shadow:
        0 18px 46px -10px rgba(0, 0, 0, 0.55),
        0 0 0 1px rgba(255, 255, 255, 0.08) inset !important;
}
.shift-topline {
    display: flex !important;
    align-items: center !important;
    gap: 12px !important;
    margin-bottom: 14px !important;
    flex-wrap: wrap !important;
}
.shift-topline select {
    border-radius: 12px !important;
    background: var(--card) !important;
    border: 1px solid var(--line) !important;
    padding: 8px 14px !important;
    font-weight: 600 !important;
    font-size: 0.85rem !important;
    color: var(--ink) !important;
}
.shift-warning {
    border-radius: 14px !important;
    background: rgba(var(--accent-rgb), 0.10) !important;
    border: 1px solid rgba(var(--accent-rgb), 0.24) !important;
    color: var(--ink) !important;
    padding: 12px 18px !important;
    font-size: 0.84rem !important;
    font-weight: 550 !important;
    margin-bottom: 18px !important;
}
.shift-grid section {
    border-radius: 18px !important;
    border: 1px solid var(--line) !important;
    background: var(--card) !important;
    padding: 18px 20px !important;
    box-shadow: var(--shadow-xs) !important;
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1) !important;
}
.shift-grid section:hover {
    transform: translateY(-2px) !important;
    box-shadow: var(--shadow-sm) !important;
}
.shift-step-n {
    width: 26px !important;
    height: 26px !important;
    border-radius: 8px !important;
    font-weight: 800 !important;
    font-size: 0.80rem !important;
}

/* ── VII. Mobile UX Refinement (Apple iOS 27 Ergonomics & Space Optimization) ── */
@media (max-width: 700px) {
    /* Stage & general viewports */
    .main .stage {
        padding: 14px 12px 32px !important;
        max-width: 100% !important;
    }

    /* Presentations (Home) */
    .home-intro {
        padding: 20px 16px !important;
        border-radius: 20px !important;
        margin-bottom: 18px !important;
    }
    .home-intro h1 {
        font-size: clamp(1.5rem, 5.5vw, 1.95rem) !important;
        line-height: 1.25 !important;
        margin: 10px 0 !important;
    }
    .home-intro p {
        font-size: 0.88rem !important;
        line-height: 1.55 !important;
    }
    .home-actions {
        display: flex !important;
        flex-direction: column !important;
        gap: 10px !important;
        width: 100% !important;
        margin-top: 18px !important;
    }
    .home-actions .home-cta,
    .home-actions .home-secondary-btn {
        width: 100% !important;
        justify-content: center !important;
        min-height: 48px !important;
        font-size: 0.88rem !important;
        border-radius: 14px !important;
    }
    .home-intro-stats {
        gap: 6px !important;
        margin-top: 16px !important;
        flex-wrap: wrap !important;
    }
    .home-intro-stat {
        font-size: 0.76rem !important;
        padding: 4px 10px !important;
    }

    /* Clinical presentation cards */
    .cp-grid {
        grid-template-columns: 1fr !important;
        gap: 10px !important;
    }
    .cp-grid .cp-card {
        padding: 14px 16px !important;
        border-radius: 16px !important;
        min-height: 80px !important;
    }
    .cp-card .cp-ico {
        width: 40px !important;
        height: 40px !important;
        border-radius: 12px !important;
    }

    /* Topic Presentation detail view */
    .cp-hero {
        padding: 16px 14px !important;
        border-radius: 18px !important;
        margin-bottom: 14px !important;
    }
    .cp-hero-nav {
        margin-bottom: 12px !important;
    }
    .ios-nav-back {
        min-height: 42px !important;
        padding: 6px 14px !important;
        font-size: 0.84rem !important;
        border-radius: 999px !important;
    }
    .cp-hero h1 {
        font-size: clamp(1.45rem, 5vw, 1.85rem) !important;
        margin: 6px 0 !important;
    }
    .presentation-toc {
        display: flex !important;
        flex-wrap: nowrap !important;
        overflow-x: auto !important;
        -webkit-overflow-scrolling: touch !important;
        scrollbar-width: none !important;
        gap: 6px !important;
        padding-bottom: 6px !important;
        margin-bottom: 16px !important;
    }
    .presentation-toc::-webkit-scrollbar {
        display: none !important;
    }
    .section-jump {
        flex-shrink: 0 !important;
        padding: 7px 12px !important;
        font-size: 0.78rem !important;
        border-radius: 10px !important;
    }
    .section-card {
        border-radius: 16px !important;
        margin-bottom: 14px !important;
    }
    .sec-head {
        padding: 14px 16px !important;
        min-height: 52px !important;
        font-size: 0.95rem !important;
    }
    .sec-body {
        padding: 0 16px 16px !important;
    }

    /* Page 2: Practice workspace */
    .learning-workspace {
        background: transparent !important;
        border: none !important;
        box-shadow: none !important;
        padding: 0 !important;
    }
    .study-page,
    .case-practice {
        border-radius: 18px !important;
        padding: 16px !important;
    }
    .quiz-options {
        display: grid !important;
        gap: 10px !important;
    }
    .quiz-option {
        min-height: 52px !important;
        padding: 12px 16px !important;
        border-radius: 14px !important;
        font-size: 0.88rem !important;
        font-weight: 550 !important;
        border: 1.5px solid var(--line) !important;
        background: var(--card) !important;
        color: var(--ink) !important;
        box-shadow: 0 1px 4px rgba(0, 0, 0, 0.03) !important;
        text-align: left !important;
        cursor: pointer !important;
        transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1) !important;
    }
    .quiz-option:active {
        transform: scale(0.98) !important;
    }
    .quiz-option.correct {
        background: rgba(16, 185, 129, 0.12) !important;
        border-color: #10b981 !important;
        color: #047857 !important;
        font-weight: 700 !important;
    }
    html[data-theme="dark"] .quiz-option.correct {
        background: rgba(16, 185, 129, 0.20) !important;
        color: #34d399 !important;
    }
    .quiz-option.incorrect {
        background: rgba(239, 68, 68, 0.12) !important;
        border-color: #ef4444 !important;
        color: #b91c1c !important;
        font-weight: 700 !important;
    }
    html[data-theme="dark"] .quiz-option.incorrect {
        background: rgba(239, 68, 68, 0.20) !important;
        color: #f87171 !important;
    }
    .case-update {
        border-radius: 16px !important;
        border: 1px solid var(--line) !important;
        border-left: 4px solid var(--brand-2) !important;
        background: var(--card) !important;
        padding: 16px 18px !important;
        margin: 14px 0 18px !important;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03) !important;
    }
    .case-update strong {
        display: block !important;
        font-size: 0.76rem !important;
        text-transform: uppercase !important;
        letter-spacing: 0.06em !important;
        color: var(--brand-2) !important;
        margin-bottom: 6px !important;
    }
    .workspace-feedback {
        border-radius: 16px !important;
        border: 1px solid var(--line) !important;
        border-left: 4px solid var(--brand-2) !important;
        background: var(--card) !important;
        padding: 18px !important;
        margin: 16px 0 !important;
    }
    .workspace-primary {
        display: inline-flex !important;
        align-items: center !important;
        justify-content: center !important;
        min-height: 48px !important;
        padding: 12px 24px !important;
        border-radius: 14px !important;
        background: var(--brand) !important;
        color: var(--on-fill) !important;
        font-size: 0.90rem !important;
        font-weight: 700 !important;
        border: none !important;
        cursor: pointer !important;
        width: 100% !important;
        margin-top: 14px !important;
        box-shadow: 0 4px 14px rgba(var(--brand-rgb), 0.25) !important;
    }

    /* Page 3: ECG Guide */
    .ecg-hero {
        padding: 18px 16px !important;
        border-radius: 18px !important;
    }
    .ecg-step {
        border-radius: 16px !important;
        margin-bottom: 12px !important;
    }
    .ecg-wavebtns {
        display: flex !important;
        flex-wrap: wrap !important;
        gap: 6px !important;
    }
    .ecg-wavebtn {
        flex: 1 1 30% !important;
        min-height: 42px !important;
        font-size: 0.78rem !important;
        padding: 6px 8px !important;
        border-radius: 10px !important;
    }

    /* Page 4: ECG Explorer */
    .explorer-heading h1 {
        font-size: 1.4rem !important;
    }
    .explorer-controls {
        padding: 12px !important;
        border-radius: 14px !important;
        gap: 8px !important;
    }
    .explorer-findings {
        padding: 14px !important;
        border-radius: 14px !important;
    }

    /* Page 5: Shift View */
    .shift-sheet {
        padding: 16px 14px !important;
        border-radius: 18px !important;
    }
    .shift-topline {
        padding: 14px !important;
        border-radius: 14px !important;
    }
    .shift-grid section {
        padding: 16px 14px !important;
        border-radius: 16px !important;
    }
}

/* ══════════ Apple iOS 27 Liquid Glass Bottom Tab Bar ══════════ */
.ios-tabbar {
    display: none;
}

@media (max-width: 920px) {
    .ios-tabbar {
        display: block !important;
        position: fixed !important;
        bottom: 0 !important;
        left: 0 !important;
        right: 0 !important;
        z-index: 9999 !important;
        padding: 6px 12px calc(8px + env(safe-area-inset-bottom, 12px)) !important;
        pointer-events: none !important;
    }

    .ios-tabbar-inner {
        pointer-events: auto !important;
        max-width: 440px;
        margin: 0 auto;
        display: flex;
        align-items: center;
        justify-content: space-around;
        background: var(--glass-bg-primary, rgba(15, 23, 42, 0.82));
        -webkit-backdrop-filter: blur(28px) saturate(190%);
        backdrop-filter: blur(28px) saturate(190%);
        border: 1px solid var(--glass-border-subtle, rgba(255, 255, 255, 0.1));
        box-shadow: 0 10px 36px rgba(0, 0, 0, 0.28), 0 1px 2px rgba(255, 255, 255, 0.12) inset;
        border-radius: 26px;
        padding: 4px 6px;
        position: relative;
    }

    .tabbar-item {
        flex: 1;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2px;
        min-height: 48px;
        padding: 5px 2px 3px;
        background: transparent;
        border: 0;
        color: var(--ink-soft);
        font-family: inherit;
        font-size: 0.65rem;
        font-weight: 600;
        letter-spacing: -0.01em;
        cursor: pointer;
        position: relative;
        transition: transform 0.15s cubic-bezier(0.2, 0.9, 0.3, 1), color 0.15s ease;
        -webkit-tap-highlight-color: transparent;
        border-radius: 18px;
    }

    .tabbar-item:active {
        transform: scale(0.92);
    }

    .tabbar-icon {
        width: 22px;
        height: 22px;
        stroke: currentColor;
        stroke-width: 1.8;
        fill: none;
        transition: stroke 0.15s ease, transform 0.15s cubic-bezier(0.2, 0.9, 0.3, 1);
    }

    .tabbar-label {
        line-height: 1.1;
        transition: color 0.15s ease;
    }

    .tabbar-dot {
        width: 4px;
        height: 4px;
        border-radius: 50%;
        background: transparent;
        position: absolute;
        bottom: 2px;
        transition: background-color 0.2s ease, box-shadow 0.2s ease;
    }

    /* Active State */
    .tabbar-item.active,
    .tabbar-item.on-home {
        color: var(--accent) !important;
    }

    .tabbar-item.active .tabbar-icon,
    .tabbar-item.on-home .tabbar-icon {
        stroke: var(--accent) !important;
        transform: translateY(-1px);
    }

    .tabbar-item.active .tabbar-dot,
    .tabbar-item.on-home .tabbar-dot {
        background: var(--accent) !important;
        box-shadow: 0 0 6px var(--accent);
    }

    /* Shrink mobile topbar to single row: burger + search + settings */
    .topbar {
        grid-template-rows: 44px !important;
        min-height: auto !important;
        padding-bottom: 6px !important;
    }

    .topbar > .primary-nav {
        display: none !important;
    }

    /* Avoid content hidden behind tab bar */
    .main .stage {
        padding-bottom: calc(84px + env(safe-area-inset-bottom, 16px)) !important;
        scroll-padding-bottom: calc(84px + env(safe-area-inset-bottom, 16px)) !important;
    }

    .foot {
        padding-bottom: calc(96px + env(safe-area-inset-bottom, 16px)) !important;
    }

    /* Float toasts above tab bar */
    .toast, #toast {
        bottom: calc(76px + env(safe-area-inset-bottom, 16px)) !important;
    }
}

@media print {
    .ios-tabbar {
        display: none !important;
    }
}

/* ══════════ Apple iOS 27 Liquid Glass Accordions & Glow ══════════ */
details > summary {
    list-style: none;
    position: relative;
    transition: background-color var(--transition-fast) ease, color var(--transition-fast) ease;
    -webkit-tap-highlight-color: transparent;
}

details > summary::-webkit-details-marker {
    display: none;
}

.cp-card details > summary::after,
.guided-reasoning > summary::after,
.reference-firstpass > summary::after,
.ecg-pattern-index > summary::after,
.student-glossary > summary::after {
    content: '';
    display: inline-block;
    width: 8px;
    height: 8px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(-45deg);
    transition: transform var(--transition-smooth) var(--ease-spring);
    margin-left: auto;
    flex-shrink: 0;
    opacity: 0.65;
}

.cp-card details[open] > summary::after,
.guided-reasoning[open] > summary::after,
.reference-firstpass[open] > summary::after,
.ecg-pattern-index[open] > summary::after,
.student-glossary[open] > summary::after {
    transform: rotate(45deg);
    opacity: 1;
}

.rf-box,
.ecg-redflags {
    box-shadow: 0 4px 20px rgba(220, 38, 38, 0.08), 0 0 1px rgba(220, 38, 38, 0.25) !important;
    backdrop-filter: blur(12px) !important;
}

.rf-item.is-checked,
.rf-item:has(input:checked) {
    box-shadow: 0 2px 10px rgba(220, 38, 38, 0.12) !important;
}

/* ══════════ Phase 3: Practice & Evolving Decisions Glass ══════════ */
.study-tabs,
.workspace-tabs {
    display: flex !important;
    background: var(--glass-bg-pill, rgba(0, 0, 0, 0.05)) !important;
    border: 1px solid var(--glass-border-subtle, rgba(255, 255, 255, 0.08)) !important;
    border-radius: 14px !important;
    padding: 3px !important;
    gap: 2px !important;
    overflow-x: auto !important;
    -webkit-overflow-scrolling: touch !important;
}

.study-tabs button,
.workspace-tabs a {
    flex: 1 1 auto !important;
    min-height: 38px !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    padding: 6px 14px !important;
    border-radius: 11px !important;
    border: 0 !important;
    font-size: 0.82rem !important;
    font-weight: 600 !important;
    color: var(--ink-soft) !important;
    background: transparent !important;
    text-decoration: none !important;
    transition: all 0.2s cubic-bezier(0.2, 0.9, 0.3, 1) !important;
    white-space: nowrap !important;
}

.study-tabs button.active,
.workspace-tabs a.active,
.workspace-tabs a[aria-current="page"] {
    background: var(--card) !important;
    color: var(--ink) !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12), 0 0 1px rgba(0, 0, 0, 0.08) !important;
}

.workspace-stepper-wrap {
    margin: 12px 0 16px;
    padding: 10px 14px;
    border-radius: 14px;
    background: var(--glass-bg-pill, rgba(0, 0, 0, 0.04));
    border: 1px solid var(--glass-border-subtle, rgba(255, 255, 255, 0.08));
}

.stepper-track {
    height: 5px;
    background: var(--line);
    border-radius: 999px;
    overflow: hidden;
    margin-bottom: 8px;
}

.stepper-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 999px;
    transition: width 0.35s cubic-bezier(0.2, 0.9, 0.3, 1);
}

.workspace-step {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.78rem;
    font-weight: 650;
    color: var(--ink-soft);
    margin: 0 !important;
}

.workspace-result {
    border-radius: 18px !important;
    background: var(--glass-bg-card, rgba(30, 41, 59, 0.45)) !important;
    backdrop-filter: blur(20px) !important;
    border: 1px solid var(--glass-border-subtle, rgba(255, 255, 255, 0.1)) !important;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12) !important;
    padding: 22px !important;
}

/* ══════════ Phase 5: Shift View High-Acuity Bands & Handover ══════════ */
.shift-head-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.shift-head-actions .handover-btn,
.shift-head-actions .review-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 999px;
    font-size: 0.82rem;
    font-weight: 650;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.2, 0.9, 0.3, 1);
    font-family: inherit;
    text-decoration: none;
    line-height: 1.2;
}

.shift-head-actions .handover-btn {
    color: var(--on-fill);
    background: var(--brand);
    border: 1px solid var(--brand);
    box-shadow: 0 2px 10px rgba(var(--brand-rgb, var(--accent-rgb)), 0.25);
}

.shift-head-actions .handover-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(var(--brand-rgb, var(--accent-rgb)), 0.35);
}

.shift-head-actions .review-btn {
    color: var(--ink);
    background: var(--card);
    border: 1px solid var(--line);
    box-shadow: var(--shadow-xs);
}

.shift-head-actions .review-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-1px);
}

html[data-theme="dark"] .shift-head-actions .review-btn {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.14);
    color: var(--ink);
}

.shift-head-actions .handover-btn:active,
.shift-head-actions .review-btn:active {
    transform: scale(0.96);
}

.shift-grid .shift-red {
    border-left: 4px solid var(--critical) !important;
    background: color-mix(in srgb, var(--critical) 5%, var(--card)) !important;
    box-shadow: 0 4px 18px rgba(220, 38, 38, 0.06) !important;
}

.shift-grid .shift-crit {
    border-left: 4px solid var(--emergent) !important;
    background: color-mix(in srgb, var(--emergent) 5%, var(--card)) !important;
}

.shift-grid .shift-disposition {
    border-left: 4px solid var(--common) !important;
    background: color-mix(in srgb, var(--common) 5%, var(--card)) !important;
}

/* ══════════════════════════════════════════════════════════════
   iOS 27 Liquid Glass: Native Emoji Badges & Practice Overhaul
   ══════════════════════════════════════════════════════════════ */
.ios-emoji-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    font-size: 1.45rem;
    font-family: -apple-system, BlinkMacSystemFont, "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji", sans-serif;
    user-select: none;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.12);
    filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.06));
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.cp-card:hover .ios-emoji-badge {
    transform: scale(1.12);
}
.cp-hero .cp-ico-lg .ios-emoji-badge {
    font-size: 2.1rem;
}
.sec-ico .ios-emoji-badge,
.sec-badge {
    font-size: 1.25rem;
}
.chip-ico .ios-emoji-badge {
    font-size: 0.95rem;
}
.side-item .ico .ios-emoji-badge {
    font-size: 1.15rem;
}
.res-ico .ios-emoji-badge {
    font-size: 1.15rem;
}
.study-topic-ico .ios-emoji-badge {
    font-size: 1.35rem;
}

/* Practice Filter Bar & Segmented Chips */
.workspace-filter-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 16px 0 12px;
    gap: 12px;
    flex-wrap: wrap;
}
.practice-filter-chips {
    display: flex;
    align-items: center;
    gap: 8px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding: 4px 2px;
    max-width: 100%;
}
.practice-filter-chips::-webkit-scrollbar {
    display: none;
}
.practice-chip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 16px;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--ink-soft);
    background: var(--glass-card-bg, rgba(255, 255, 255, 0.08));
    border: 1px solid var(--glass-card-border, rgba(255, 255, 255, 0.14));
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}
.practice-chip:hover {
    color: var(--ink);
    border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
    background: color-mix(in srgb, var(--accent) 8%, var(--card));
}
.practice-chip.active {
    background: var(--brand-2, #0071e3);
    color: #ffffff !important;
    border-color: var(--brand-2, #0071e3);
    box-shadow: 0 4px 14px rgba(var(--accent-rgb, 0, 113, 227), 0.35);
    font-weight: 700;
}
html[data-theme="dark"] .practice-chip.active {
    background: var(--brand) !important;
    color: var(--on-fill) !important;
    border-color: var(--brand) !important;
    box-shadow: 0 4px 14px rgba(var(--accent-rgb), 0.35) !important;
}

/* Practice Case Cards */
.practice-case-card {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 18px 20px;
    border-radius: 18px;
    background: var(--glass-card-bg, var(--card));
    border: 1px solid var(--glass-card-border, var(--line));
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--glass-card-shadow, var(--shadow-sm));
    transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.2s ease, border-color 0.2s ease;
    text-decoration: none;
    color: inherit;
}
.practice-case-card:hover {
    transform: translateY(-2px);
    border-color: color-mix(in srgb, var(--accent) 50%, var(--line));
    box-shadow: var(--shadow-md, 0 8px 24px rgba(0, 0, 0, 0.12));
}
.practice-case-card:active {
    transform: scale(0.985);
}
html[data-theme="dark"] .practice-case-card {
    background: rgba(26, 30, 36, 0.75) !important;
    border-color: rgba(255, 255, 255, 0.08) !important;
    box-shadow: 0 4px 18px rgba(0, 0, 0, 0.35) !important;
}
html[data-theme="dark"] .practice-case-card:hover {
    border-color: rgba(var(--accent-rgb), 0.45) !important;
    box-shadow: 0 8px 26px rgba(0, 0, 0, 0.5) !important;
}
.practice-domain-wrap {
    display: inline-flex;
    align-items: center;
    gap: 10px;
}
.practice-card-emoji {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: color-mix(in srgb, var(--accent) 12%, transparent);
    border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
    font-size: 1.3rem;
    flex: none;
}
.evolving-case-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 12px;
}
.practice-hero-emoji {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    background: color-mix(in srgb, var(--accent) 12%, transparent);
    border: 1px solid color-mix(in srgb, var(--accent) 24%, transparent);
    font-size: 1.9rem;
    flex: none;
    box-shadow: 0 4px 14px rgba(var(--accent-rgb, 0, 113, 227), 0.15);
}
.evolving-case-header h2 {
    margin: 0;
    font-size: clamp(1.3rem, 3vw, 1.7rem);
    font-weight: 750;
    letter-spacing: -0.02em;
}

/* Quiz Options tactile styling */
.evolving-case .quiz-options {
    display: grid;
    gap: 10px;
    margin: 16px 0;
}
.evolving-case .quiz-option {
    display: flex;
    align-items: center;
    gap: 12px;
    text-align: left;
    padding: 13px 16px;
    border-radius: 14px;
    background: var(--card);
    border: 1.5px solid var(--line);
    font-size: 0.95rem;
    line-height: 1.4;
    transition: all 0.18s cubic-bezier(0.16, 1, 0.3, 1);
    cursor: pointer;
    width: 100%;
    color: var(--ink);
    box-shadow: var(--shadow-xs, 0 1px 3px rgba(0,0,0,0.04));
}
.evolving-case .option-pill {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 8px;
    font-weight: 750;
    font-size: 0.85rem;
    background: color-mix(in srgb, var(--ink) 8%, transparent);
    color: var(--ink);
    flex: none;
    transition: all 0.18s ease;
}
.evolving-case .option-label {
    flex: 1;
    min-width: 0;
}
.evolving-case .quiz-option:hover:not(:disabled) {
    border-color: var(--brand-2, #0071e3);
    background: color-mix(in srgb, var(--brand-2, #0071e3) 6%, var(--card));
    transform: translateX(3px);
}
.evolving-case .quiz-option:hover:not(:disabled) .option-pill {
    background: var(--brand-2, #0071e3);
    color: #ffffff;
}
html[data-theme="dark"] .evolving-case .quiz-option:hover:not(:disabled) {
    border-color: var(--accent) !important;
    background: color-mix(in srgb, var(--accent) 10%, var(--card)) !important;
}
html[data-theme="dark"] .evolving-case .quiz-option:hover:not(:disabled) .option-pill {
    background: var(--accent) !important;
    color: var(--on-fill) !important;
}
.evolving-case .quiz-option.correct {
    border-color: #10b981 !important;
    background: rgba(16, 185, 129, 0.12) !important;
    color: var(--ink) !important;
}
.evolving-case .quiz-option.correct .option-pill {
    background: #10b981 !important;
    color: #ffffff !important;
}
.evolving-case .quiz-option.incorrect {
    border-color: #ef4444 !important;
    background: rgba(239, 68, 68, 0.12) !important;
    color: var(--ink) !important;
}
.evolving-case .quiz-option.incorrect .option-pill {
    background: #ef4444 !important;
    color: #ffffff !important;
}
html[data-theme="dark"] .evolving-case .quiz-option.correct {
    background: rgba(16, 185, 129, 0.22) !important;
    border-color: #34d399 !important;
    color: #34d399 !important;
}
html[data-theme="dark"] .evolving-case .quiz-option.correct .option-pill {
    background: #10b981 !important;
    color: #0b1a13 !important;
}
html[data-theme="dark"] .evolving-case .quiz-option.incorrect {
    background: rgba(239, 68, 68, 0.22) !important;
    border-color: #f87171 !important;
    color: #f87171 !important;
}
html[data-theme="dark"] .evolving-case .quiz-option.incorrect .option-pill {
    background: #ef4444 !important;
    color: #ffffff !important;
}

/* Debrief Result Header */
.result-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}
.result-emoji {
    width: 40px;
    height: 40px;
    border-radius: 11px;
    background: color-mix(in srgb, var(--accent) 12%, transparent);
    border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
    font-size: 1.5rem;
    flex: none;
}
.result-header h3 {
    margin: 0;
    font-size: 1.3rem;
    font-weight: 750;
}

/* ══════════════════════════════════════════════════════════════════
   Apple iOS 27 Liquid Glass — Badges, Shift View & ECG Explorer
   ══════════════════════════════════════════════════════════════════ */

/* Universal Emoji Badges & Alignment */
.btn-emoji {
    display: inline-block;
    margin-inline-end: 6px;
    font-size: 1.05rem;
    vertical-align: middle;
    line-height: 1;
}

.chip-emoji {
    display: inline-block;
    margin-inline-end: 6px;
    font-size: 1rem;
    vertical-align: middle;
}

.stat-emoji {
    font-size: 1.4rem;
    margin-bottom: 4px;
    display: block;
    line-height: 1.1;
}

.group-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 9px;
    font-size: 1.15rem;
    background: color-mix(in srgb, var(--accent) 12%, transparent);
    border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
    margin-inline-end: 8px;
    flex: none;
    vertical-align: middle;
}

.sec-badge-sm {
    display: inline-block;
    font-size: 1.15rem;
    margin-inline-end: 8px;
    vertical-align: middle;
    line-height: 1;
}

/* Shift View iOS 27 Styling */
.shift-head-main {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 8px;
}

.shift-hero-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 54px;
    height: 54px;
    border-radius: 16px;
    font-size: 2.1rem;
    background: linear-gradient(135deg, rgba(var(--cat-rgb, var(--accent-rgb)), 0.28) 0%, rgba(var(--cat-rgb, var(--accent-rgb)), 0.10) 100%);
    border: 1.5px solid color-mix(in srgb, rgb(var(--cat, 15, 157, 118)) 45%, transparent);
    box-shadow: 0 8px 20px -4px rgba(var(--cat-rgb, var(--accent-rgb)), 0.3), inset 0 1px 1px rgba(255, 255, 255, 0.65);
    flex: none;
    transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.shift-sheet:hover .shift-hero-badge {
    transform: scale(1.06) rotate(-2deg);
}

.shift-kicker {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--brand-2);
    margin-bottom: 4px;
}

.shift-step-badge {
    display: inline-block;
    font-size: 1.2rem;
    margin-inline: 4px 6px;
    vertical-align: middle;
}

.shift-select-wrap {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin-top: 6px;
}

.shift-select-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    font-size: 1.25rem;
    background: var(--surface-2);
    border: 1px solid var(--line);
    flex: none;
}

.warning-badge {
    display: inline-block;
    font-size: 1.3rem;
    margin-inline-end: 8px;
    vertical-align: middle;
}

.shift-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.shift-actions button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 999px;
    font-size: 0.9rem;
    font-weight: 650;
    cursor: pointer;
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.2s ease;
}

.shift-actions button:hover {
    transform: translateY(-1px);
}

.shift-actions button:active {
    transform: scale(0.97);
}

/* ECG Explorer iOS 27 Styling */
.explorer-heading-main {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 8px;
}

.explorer-hero-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    border-radius: 16px;
    font-size: 2rem;
    background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.25) 0%, rgba(var(--accent-rgb), 0.08) 100%);
    border: 1.5px solid color-mix(in srgb, var(--accent) 45%, transparent);
    box-shadow: 0 8px 20px -4px rgba(var(--accent-rgb), 0.3), inset 0 1px 1px rgba(255, 255, 255, 0.65);
    flex: none;
    transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.explorer-heading-main:hover .explorer-hero-badge {
    transform: scale(1.06) rotate(-2deg);
}

.finding-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 12px;
    font-size: 1.45rem;
    background: var(--surface-2);
    border: 1px solid var(--line);
    flex: none;
    box-shadow: var(--shadow-xs);
}

.progress-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 8px;
    font-weight: 700;
}

.progress-head h4, .path-head h4, .checklist-head h4 {
    display: flex;
    align-items: center;
    gap: 6px;
    margin: 0;
    font-size: 0.96rem;
    font-weight: 750;
}

.case-finding-head {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.case-finding-head h4 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 750;
    color: var(--ink);
}

/* Practice View iOS 27 Polish */
.practice-hero-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    border-radius: 16px;
    font-size: 2rem;
    background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.25) 0%, rgba(var(--accent-rgb), 0.08) 100%);
    border: 1.5px solid color-mix(in srgb, var(--accent) 45%, transparent);
    box-shadow: 0 8px 20px -4px rgba(var(--accent-rgb), 0.3), inset 0 1px 1px rgba(255, 255, 255, 0.65);
    flex: none;
}

.practice-card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
    gap: 16px;
}

@media (max-width: 600px) {
    .shift-hero-badge,
    .explorer-hero-badge,
    .practice-hero-badge {
        width: 44px;
        height: 44px;
        border-radius: 13px;
        font-size: 1.7rem;
    }
    .shift-head-main,
    .explorer-heading-main {
        gap: 12px;
    }
}

/* ══════════ Night Mode (Dark Theme) & Layout Fit Polish ══════════ */
html[data-theme="dark"] .shift-hero-badge,
html[data-theme="dark"] .explorer-hero-badge,
html[data-theme="dark"] .practice-hero-badge {
    box-shadow: 0 8px 20px -4px rgba(0, 0, 0, 0.5), inset 0 1px 1px rgba(255, 255, 255, 0.15) !important;
    background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.30) 0%, rgba(var(--accent-rgb), 0.10) 100%) !important;
    border-color: color-mix(in srgb, var(--accent) 45%, rgba(255, 255, 255, 0.12)) !important;
}

html[data-theme="dark"] .shift-select-badge,
html[data-theme="dark"] .finding-badge {
    background: rgba(255, 255, 255, 0.08) !important;
    border-color: rgba(255, 255, 255, 0.14) !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3) !important;
}

html[data-theme="dark"] .shift-grid section.shift-crit .shift-step-n {
    background: rgba(249, 115, 22, 0.22) !important;
    color: #fb923c !important;
}

html[data-theme="dark"] .shift-grid section.shift-red .shift-step-n {
    background: rgba(239, 68, 68, 0.22) !important;
    color: #f87171 !important;
}

html[data-theme="dark"] .shift-disposition > div {
    background: rgba(0, 0, 0, 0.25) !important;
    border-color: rgba(255, 255, 255, 0.08) !important;
}

html[data-theme="dark"] .case-update,
html[data-theme="dark"] .workspace-feedback {
    background: rgba(26, 30, 36, 0.75) !important;
    border-color: rgba(255, 255, 255, 0.08) !important;
    border-left-color: var(--accent) !important;
    box-shadow: 0 4px 18px rgba(0, 0, 0, 0.3) !important;
}

html[data-theme="dark"] .workspace-feedback details {
    background: rgba(0, 0, 0, 0.25) !important;
    border-color: rgba(255, 255, 255, 0.08) !important;
}

html[data-theme="dark"] .workspace-stepper-wrap {
    background: rgba(255, 255, 255, 0.05) !important;
    border-color: rgba(255, 255, 255, 0.08) !important;
}

html[data-theme="dark"] .stepper-track {
    background: rgba(255, 255, 255, 0.12) !important;
}

/* Mobile Fit Refinements */
.shift-select-wrap {
    max-width: 100%;
}

.shift-select-wrap select {
    min-width: 0;
    max-width: 100%;
}

@media (max-width: 680px) {
    .shift-topline {
        display: flex !important;
        flex-direction: column !important;
        align-items: stretch !important;
        gap: 10px !important;
    }
    .shift-select-wrap {
        display: flex !important;
        width: 100% !important;
        max-width: 100% !important;
    }
    .shift-select-wrap select {
        flex: 1 1 auto !important;
        width: 100% !important;
        max-width: none !important;
    }
}