/* The Anatomy Theatre — an oxblood lecture hall and a hinged engraved folio.
   The pale plate is the one expressive object; controls stay quiet and exact. */

:root {
    color-scheme: only dark;
    --hall: #160d10;
    --hall-warm: #241317;
    --velvet: #4b1f27;
    --velvet-bright: #71313b;
    --rail: #17191a;
    --paper: #e6ddc4;
    --paper-light: #f1ead7;
    --paper-deep: #cfc2a3;
    --plate-ink: #39382f;
    --plate-faint: #8b856f;
    --bone: #a79d82;
    --bone-shadow: #5f594a;
    --muscle: #9d4d43;
    --muscle-deep: #65342f;
    --muscle-fiber: #e0a17f;
    --nerve: #9c6a2f;
    --nerve-deep: #5f4527;
    --central-neural: #70566f;
    --cranial-neural: #9a523e;
    --autonomic-neural: #55796f;
    --plexus-neural: #8c7639;
    --organ-respiratory: #a96963;
    --organ-cardiac: #8b3f46;
    --organ-digestive: #a66c3f;
    --organ-urinary: #4f7d7a;
    --organ-endocrine: #785c78;
    --organ-lymphatic: #8b7350;
    --organ-boundary: #a17a59;
    --organ-outline: #594a3d;
    --brass: #b69352;
    --brass-light: #d2b574;
    --verdigris: #4f887b;
    --verdigris-bright: #73b3a3;
    --red: #b54d49;
    --cream: #eee7d5;
    --muted: #b3a99f;
    --display: 'Libre Caslon Display', 'Iowan Old Style', Georgia, serif;
    --ui: 'Public Sans', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;
    --mono: 'Roboto Mono', ui-monospace, 'SF Mono', Menlo, monospace;
}

* { box-sizing: border-box; }
html { min-height: 100%; background: var(--hall); }
body {
    min-height: 100svh;
    margin: 0;
    color: var(--cream);
    font-family: var(--ui);
    background:
        radial-gradient(ellipse 65% 32% at 50% 0%, rgba(182, 147, 82, 0.15), transparent 72%),
        repeating-radial-gradient(ellipse 78% 36% at 50% 5%, transparent 0 72px, rgba(182, 147, 82, 0.08) 73px 74px, transparent 75px 96px),
        linear-gradient(112deg, #10090b, var(--hall-warm) 48%, #10090b);
}
button, select, input { font: inherit; }
button, select { touch-action: manipulation; }
button { cursor: pointer; }
.hidden { display: none !important; }

:focus-visible {
    outline: 3px solid var(--brass-light);
    outline-offset: 3px;
}

/* Admission ------------------------------------------------------------- */

.start-screen {
    min-height: 100svh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 68px 24px 54px;
    position: relative;
    overflow: hidden;
    text-align: center;
}

.start-screen::before,
.start-screen::after {
    content: '';
    position: absolute;
    top: -5%;
    bottom: -5%;
    width: min(22vw, 260px);
    opacity: 0.72;
    pointer-events: none;
}
.start-screen::before {
    left: 0;
    background: linear-gradient(90deg, #12080b, var(--velvet), rgba(75, 31, 39, 0.2));
    clip-path: polygon(0 0, 100% 0, 68% 18%, 92% 40%, 62% 63%, 84% 82%, 48% 100%, 0 100%);
}
.start-screen::after {
    right: 0;
    background: linear-gradient(270deg, #12080b, var(--velvet), rgba(75, 31, 39, 0.2));
    clip-path: polygon(0 0, 100% 0, 100% 100%, 52% 100%, 16% 82%, 38% 63%, 8% 40%, 32% 18%);
}

.library-link {
    position: absolute;
    z-index: 2;
    top: 25px;
    left: 30px;
    color: var(--brass-light);
    font: 600 11px/1 var(--mono);
    letter-spacing: 0.16em;
    text-decoration: none;
    text-transform: uppercase;
}
.library-link:hover { text-decoration: underline; }

.theatre-mark {
    width: 58px;
    height: 58px;
    margin-bottom: 18px;
    display: grid;
    place-items: center;
    position: relative;
    z-index: 1;
    border: 1px solid var(--brass);
    border-radius: 50%;
    box-shadow: inset 0 0 0 5px var(--hall-warm), inset 0 0 0 6px rgba(182, 147, 82, 0.5);
    color: var(--brass-light);
    font: 400 22px/1 var(--display);
}
.theatre-mark::before,
.theatre-mark::after { content: ''; position: absolute; width: 48px; height: 1px; background: var(--brass); }
.theatre-mark::before { left: -54px; }
.theatre-mark::after { right: -54px; }

.eyebrow, .kicker, .rail-kicker, .prompt-label {
    margin: 0;
    color: var(--brass-light);
    font: 600 10.5px/1.3 var(--mono);
    letter-spacing: 0.2em;
    text-transform: uppercase;
}

.start-screen h1 {
    position: relative;
    z-index: 1;
    margin: 0;
    max-width: 900px;
    font: 400 clamp(50px, 8vw, 94px)/0.94 var(--display);
    letter-spacing: -0.025em;
    text-wrap: balance;
}

.subtitle {
    position: relative;
    z-index: 1;
    max-width: 590px;
    margin: 18px auto 32px;
    color: var(--muted);
    font-size: 15.5px;
    line-height: 1.6;
}

.admission-card {
    position: relative;
    z-index: 1;
    width: min(780px, 100%);
    padding: 26px 28px 22px;
    text-align: left;
    color: var(--plate-ink);
    background:
        linear-gradient(rgba(57, 56, 47, 0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(57, 56, 47, 0.025) 1px, transparent 1px),
        var(--paper);
    background-size: 11px 11px;
    border: 1px solid #9d9070;
    box-shadow: 0 25px 65px rgba(0, 0, 0, 0.48), inset 0 0 0 5px var(--paper), inset 0 0 0 6px #a59b82;
}

.card-heading {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 20px;
    padding-bottom: 18px;
    margin-bottom: 20px;
    border-bottom: 1px solid rgba(57, 56, 47, 0.35);
}
.card-heading .kicker { color: #7b583b; margin-bottom: 4px; }
.card-heading h2 { margin: 0; font: 400 31px/1.1 var(--display); }
.plate-stamp {
    flex: none;
    padding: 8px 10px 6px;
    border: 1px solid #8e4b45;
    color: #8e4b45;
    font: 600 10px/1 var(--mono);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    transform: rotate(2deg);
}

.setup-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
}
.setup-grid label {
    display: grid;
    gap: 6px;
    color: #645f50;
    font: 600 10px/1.2 var(--mono);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}
.setup-grid select {
    width: 100%;
    height: 44px;
    padding: 0 34px 0 11px;
    color: var(--plate-ink);
    background: var(--paper-light);
    border: 1px solid #8e866f;
    border-radius: 0;
    font: 500 13px/1.2 var(--ui);
    text-transform: none;
    letter-spacing: 0;
}

.primary-btn {
    min-height: 44px;
    padding: 0 20px;
    border: 1px solid #274f47;
    border-radius: 0;
    color: #f5efe0;
    background: var(--verdigris);
    box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.08);
    font-weight: 700;
}
.primary-btn:hover { background: #42776c; }
.primary-btn:disabled { opacity: 0.58; cursor: wait; }
.setup-grid > .primary-btn { align-self: end; grid-column: 4; }

.set-description {
    min-height: 42px;
    margin: 15px 0 16px;
    color: #6b6555;
    font-size: 12.5px;
    line-height: 1.55;
}

.ledger {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 12px;
    padding-top: 14px;
    border-top: 1px solid rgba(57, 56, 47, 0.22);
    color: #6b6555;
    font: 600 10px/1 var(--mono);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}
.ledger-track { height: 5px; background: #bcb096; overflow: hidden; }
.ledger-track span { display: block; width: 0; height: 100%; background: var(--verdigris); transition: width 0.25s ease; }
.ledger strong { color: var(--plate-ink); }

.how-note {
    position: relative;
    z-index: 1;
    max-width: 670px;
    margin: 18px auto 0;
    color: #887d76;
    font-size: 12px;
    line-height: 1.5;
}

/* Theatre --------------------------------------------------------------- */

.quiz-screen { min-height: 100svh; }
.lecture-rail {
    min-height: 66px;
    display: grid;
    grid-template-columns: 1fr auto auto;
    align-items: center;
    gap: 24px;
    padding: 10px 22px;
    position: relative;
    z-index: 5;
    background: linear-gradient(#1e2021, #111314);
    border-bottom: 3px solid #7c5f35;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.36);
}
.rail-title { display: grid; gap: 3px; }
.rail-title strong { font: 400 21px/1 var(--display); }
.rail-kicker { color: var(--brass); font-size: 8px; }
.stats { display: flex; gap: 19px; color: #a9a39c; font: 500 9px/1.2 var(--mono); letter-spacing: 0.09em; text-transform: uppercase; }
.stats span { display: grid; gap: 4px; text-align: center; }
.stats b { color: var(--cream); font-size: 14px; letter-spacing: 0; }
.quiet-btn, .instrument-btn, .plate-tab {
    border: 1px solid rgba(210, 181, 116, 0.48);
    border-radius: 0;
    color: var(--cream);
    background: transparent;
    font-weight: 600;
}
.quiet-btn { min-height: 36px; padding: 0 14px; }
.quiet-btn:hover, .instrument-btn:hover { background: rgba(210, 181, 116, 0.09); }

.theatre-layout {
    min-height: calc(100svh - 66px);
    display: grid;
    grid-template-columns: minmax(285px, 360px) minmax(0, 1fr);
}

.question-panel {
    padding: clamp(30px, 5vw, 64px) clamp(22px, 4vw, 46px);
    position: relative;
    z-index: 2;
    background:
        linear-gradient(90deg, rgba(255, 255, 255, 0.015), transparent 16%),
        linear-gradient(145deg, #2b171b, #1c1114);
    border-right: 1px solid #654129;
    box-shadow: 15px 0 35px rgba(0, 0, 0, 0.25);
}
.question-panel::after {
    content: '';
    display: block;
    width: 70px;
    height: 1px;
    margin-top: 42px;
    background: var(--brass);
    box-shadow: 0 5px 0 rgba(182, 147, 82, 0.38);
}
.prompt-label { margin-bottom: 14px; color: var(--brass); }
.question-panel h2 {
    min-height: 2.2em;
    margin: 0;
    font: 400 clamp(33px, 4.4vw, 55px)/1.02 var(--display);
    text-wrap: balance;
}
.prompt-support { min-height: 3em; margin: 16px 0 24px; color: var(--muted); font-size: 13px; line-height: 1.55; }

.answer-form { margin-bottom: 16px; }
.answer-form > label { display: block; margin-bottom: 6px; color: var(--brass); font: 600 9px/1 var(--mono); letter-spacing: 0.14em; text-transform: uppercase; }
.answer-row { display: grid; grid-template-columns: 1fr auto; }
.answer-row input {
    min-width: 0;
    height: 46px;
    padding: 0 12px;
    border: 1px solid #746252;
    border-right: 0;
    border-radius: 0;
    color: var(--plate-ink);
    background: var(--paper-light);
    font-size: 16px;
}
.answer-row .primary-btn { padding-inline: 14px; }

.feedback {
    min-height: 6.8em;
    padding: 12px 0;
    color: #bdb2aa;
    border-top: 1px solid rgba(182, 147, 82, 0.22);
    font-size: 12.5px;
    line-height: 1.55;
}
.feedback.correct { color: #93cbbb; }
.feedback.incorrect { color: #df8a80; }
.feedback.hint { color: var(--brass-light); }
.suggestion-box {
    margin: -2px 0 16px;
    padding: 13px 14px;
    color: var(--plate-ink);
    background: var(--paper);
    border: 1px solid #887a5d;
    box-shadow: inset 0 0 0 3px var(--paper), inset 0 0 0 4px rgba(95, 89, 74, 0.25);
    font-size: 12.5px;
    line-height: 1.45;
}
.suggestion-box > span { display: block; margin-bottom: 10px; }
.suggestion-box strong { font-family: var(--display); font-size: 18px; font-weight: 400; }
.suggestion-box > div { display: flex; flex-wrap: wrap; gap: 7px; }
.suggestion-box button {
    min-height: 34px;
    padding: 0 10px;
    border-radius: 0;
    font-size: 11px;
    font-weight: 700;
}
.suggestion-yes { color: #f5efe0; background: var(--verdigris); border: 1px solid #274f47; }
.suggestion-no { color: #5f594a; background: transparent; border: 1px solid #8f836b; }
.hint-text {
    margin: -6px 0 16px;
    padding: 12px;
    border-left: 2px solid var(--brass);
    color: #d7ccb7;
    background: rgba(182, 147, 82, 0.08);
    font-size: 12px;
    line-height: 1.5;
}
.question-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.instrument-btn { min-height: 40px; padding: 0 13px; }
.instrument-btn:disabled { opacity: 0.4; cursor: default; }
.next-round-btn { min-height: 40px; }
.next-round-btn kbd { color: #e8ddc4; }
kbd {
    margin-left: 4px;
    padding: 1px 4px;
    color: #cab991;
    background: rgba(0, 0, 0, 0.24);
    border: 1px solid rgba(202, 185, 145, 0.35);
    border-radius: 2px;
    font: 500 9px/1.3 var(--mono);
}
.keyboard-note { margin: 15px 0 0; color: #776d69; font-size: 10px; line-height: 1.5; }

/* The engraved folio ---------------------------------------------------- */

.plate-stage {
    min-width: 0;
    padding: 24px clamp(18px, 5vw, 70px) 32px;
    display: grid;
    align-content: start;
    justify-items: center;
    background:
        radial-gradient(ellipse 52% 84% at 50% 39%, rgba(218, 186, 119, 0.16), transparent 72%),
        linear-gradient(90deg, rgba(0, 0, 0, 0.16), transparent 16% 84%, rgba(0, 0, 0, 0.16)),
        #1a1012;
}
.plate-controls {
    width: min(100%, 610px);
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 12px;
    position: relative;
    z-index: 2;
    margin-bottom: -1px;
}
.plate-tabs { display: flex; }
.plate-tab {
    min-width: 130px;
    height: 40px;
    padding: 0 15px;
    color: #b8aca1;
    background: #21161a;
    border-color: #765d37;
    font: 600 10px/1 var(--mono);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}
.plate-tab + .plate-tab { border-left: 0; }
.plate-tab.active { color: var(--plate-ink); background: var(--paper); border-bottom-color: var(--paper); }
.plate-tab.active kbd { color: #6d5a38; background: rgba(57, 56, 47, 0.06); border-color: rgba(57, 56, 47, 0.24); }
.focus-toggle {
    min-height: 34px;
    margin-bottom: 5px;
    padding: 0 10px;
    color: #d6c59d;
    background: rgba(44, 29, 31, 0.9);
    border: 1px solid #765d37;
    font: 600 9px/1 var(--mono);
    letter-spacing: 0.06em;
    text-transform: uppercase;
}
.focus-toggle:hover, .focus-toggle:focus-visible { color: #fff3d3; border-color: var(--brass); }
.focus-toggle[aria-pressed="true"]::before { content: '⌕'; margin-right: 6px; color: var(--brass-light); font-size: 14px; }

.folio {
    width: min(100%, 610px);
    min-height: 690px;
    padding: 24px 28px 16px;
    position: relative;
    color: var(--plate-ink);
    background:
        radial-gradient(circle at 18% 17%, rgba(100, 86, 57, 0.06) 0 1px, transparent 1.5px),
        radial-gradient(circle at 78% 64%, rgba(100, 86, 57, 0.05) 0 1px, transparent 1.5px),
        linear-gradient(90deg, rgba(83, 73, 52, 0.05), transparent 10% 90%, rgba(83, 73, 52, 0.06)),
        var(--paper);
    background-size: 13px 17px, 19px 23px, auto, auto;
    border: 1px solid #8d7f60;
    box-shadow: 0 28px 60px rgba(0, 0, 0, 0.48), inset 0 0 0 7px var(--paper), inset 0 0 0 8px #a49980;
}
.folio::before {
    content: '';
    position: absolute;
    inset: 13px;
    border: 1px solid rgba(72, 69, 57, 0.22);
    pointer-events: none;
}
.folio-corner { width: 22px; height: 22px; position: absolute; z-index: 2; border-color: rgba(57, 56, 47, 0.52); pointer-events: none; }
.top-left { top: 17px; left: 17px; border-top: 1px solid; border-left: 1px solid; }
.top-right { top: 17px; right: 17px; border-top: 1px solid; border-right: 1px solid; }
.bottom-left { bottom: 17px; left: 17px; border-bottom: 1px solid; border-left: 1px solid; }
.bottom-right { bottom: 17px; right: 17px; border-bottom: 1px solid; border-right: 1px solid; }

.plate-view { display: none; height: min(72vh, 650px); min-height: 580px; }
.plate-view.active { display: block; animation: plate-turn 0.3s ease-out; }
.plate-view svg { display: block; width: 100%; height: 100%; overflow: visible; }
.plate-view.focused { overflow: hidden; }
.plate-view.focused svg { overflow: hidden; animation: lens-settle 0.28s ease-out; }
.plate-caption {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    padding: 9px 8px 0;
    border-top: 1px solid rgba(57, 56, 47, 0.3);
    color: #6d6858;
    font: 500 9px/1.2 var(--mono);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

/* SVG interaction. The generated plates supply geometry only. */
.plate-view .anatomy-region { cursor: pointer; transition: color 0.16s ease, filter 0.16s ease; }
.plate-view .bone-region { color: var(--bone); }
.plate-view .bone-region .bone-fill { fill: currentColor; stroke: var(--bone-shadow); stroke-width: 1.2; vector-effect: non-scaling-stroke; }
.plate-view .bone-region .bone-line { fill: none; stroke: currentColor; stroke-width: 8; stroke-linecap: round; stroke-linejoin: round; vector-effect: non-scaling-stroke; }
.plate-view .bone-region .detail { fill: none; stroke: #77715f; stroke-width: 0.85; opacity: 0.8; vector-effect: non-scaling-stroke; pointer-events: none; }
.plate-view .bone-region .hit { fill: none; stroke: transparent; stroke-width: 18; vector-effect: non-scaling-stroke; }
.plate-view .muscle-region { color: var(--muscle); }
.plate-view .muscle-region.tone-light { color: #ad5e50; }
.plate-view .muscle-region.tone-dark { color: #864039; }
.plate-view .muscle-region .muscle-fill {
    fill: currentColor;
    stroke: var(--muscle-deep);
    stroke-width: 1.15;
    stroke-linejoin: round;
    vector-effect: non-scaling-stroke;
}
.plate-view .muscle-region .muscle-line {
    fill: none;
    stroke: currentColor;
    stroke-width: 12;
    stroke-linecap: round;
    vector-effect: non-scaling-stroke;
}
.plate-view .muscle-region .fiber {
    fill: none;
    stroke: var(--muscle-fiber);
    stroke-width: 0.9;
    opacity: 0.68;
    vector-effect: non-scaling-stroke;
    pointer-events: none;
}
.plate-view .body-silhouette {
    fill: #c6baa0;
    stroke: #696251;
    stroke-width: 1;
    vector-effect: non-scaling-stroke;
}
.plate-view .body-detail {
    fill: none;
    stroke: #716b59;
    stroke-width: 0.8;
    opacity: 0.62;
    vector-effect: non-scaling-stroke;
}
.plate-view .body-landmark {
    fill: none;
    stroke: #625c4d;
    stroke-width: 0.9;
    stroke-dasharray: 2 1.5;
    opacity: 0.5;
    vector-effect: non-scaling-stroke;
    pointer-events: none;
}
.plate-view .nerve-region { color: var(--nerve); }
.plate-view .nerve-region.central { color: var(--central-neural); }
.plate-view .nerve-region.cranial { color: var(--cranial-neural); }
.plate-view .nerve-region.autonomic { color: var(--autonomic-neural); }
.plate-view .nerve-region.plexus { color: var(--plexus-neural); }
.plate-view .nerve-region .nerve-line {
    fill: none;
    stroke: currentColor;
    stroke-width: calc(var(--nerve-width, 3.5) * 1px);
    stroke-linecap: round;
    stroke-linejoin: round;
    vector-effect: non-scaling-stroke;
}
.plate-view .nerve-region .nerve-hit {
    fill: none;
    stroke: transparent;
    stroke-width: 18;
    stroke-linecap: round;
    stroke-linejoin: round;
    vector-effect: non-scaling-stroke;
    pointer-events: stroke;
}
.plate-view .nerve-region .nerve-fill {
    fill: currentColor;
    stroke: var(--nerve-deep);
    stroke-width: 1.1;
    vector-effect: non-scaling-stroke;
}
.plate-view .nerve-region .nerve-node {
    fill: currentColor;
    stroke: var(--nerve-deep);
    stroke-width: 0.8;
    vector-effect: non-scaling-stroke;
}
.plate-view .nerve-region .neural-detail {
    fill: none;
    stroke: rgba(239, 225, 194, 0.7);
    stroke-width: 0.8;
    vector-effect: non-scaling-stroke;
    pointer-events: none;
}
.plate-view .nervous-ground .body-silhouette { fill: #d2c8b1; opacity: 0.72; }
.plate-view .nervous-ground .body-landmark { opacity: 0.28; }
.plate-view .organ-ground .body-silhouette { fill: #cbbfa6; opacity: 0.5; }
.plate-view .cavity-window {
    fill: rgba(239, 225, 194, 0.42);
    stroke: #756b58;
    stroke-width: 1.2;
    vector-effect: non-scaling-stroke;
}
.plate-view .cavity-rim {
    fill: none;
    stroke: #81745d;
    stroke-width: 1.1;
    stroke-dasharray: 4 2;
    opacity: 0.7;
    vector-effect: non-scaling-stroke;
}
.plate-view .rib-ghost {
    fill: none;
    stroke: #958b74;
    stroke-width: 1;
    opacity: 0.32;
    vector-effect: non-scaling-stroke;
}
.plate-view .cavity-copy {
    fill: #796e5c;
    font: 500 9px/1 var(--mono);
    letter-spacing: 2px;
}
.plate-view .organ-region { color: var(--organ-digestive); }
.plate-view .organ-region.respiratory { color: var(--organ-respiratory); }
.plate-view .organ-region.cardiac { color: var(--organ-cardiac); }
.plate-view .organ-region.digestive { color: var(--organ-digestive); }
.plate-view .organ-region.digestive.tone-dark { color: #875634; }
.plate-view .organ-region.digestive.tone-light { color: #be895d; }
.plate-view .organ-region.digestive.biliary { color: #68784e; }
.plate-view .organ-region.urinary { color: var(--organ-urinary); }
.plate-view .organ-region.endocrine { color: var(--organ-endocrine); }
.plate-view .organ-region.endocrine.pancreatic { color: #b17d55; }
.plate-view .organ-region.lymphatic { color: var(--organ-lymphatic); }
.plate-view .organ-region.boundary { color: var(--organ-boundary); }
.plate-view .organ-region.deep { opacity: 0.8; }
.plate-view .organ-region .organ-fill {
    fill: currentColor;
    stroke: var(--organ-outline);
    stroke-width: 1.25;
    stroke-linejoin: round;
    vector-effect: non-scaling-stroke;
}
.plate-view .organ-region .organ-tube {
    fill: none;
    stroke: currentColor;
    stroke-width: calc(var(--organ-width, 8) * 1px);
    stroke-linecap: round;
    stroke-linejoin: round;
    vector-effect: non-scaling-stroke;
}
.plate-view .organ-region .organ-hit {
    fill: none;
    stroke: transparent;
    stroke-width: calc(var(--organ-hit-width, 20) * 1px);
    stroke-linecap: round;
    stroke-linejoin: round;
    vector-effect: non-scaling-stroke;
    pointer-events: stroke;
}
.plate-view .organ-region .organ-detail {
    fill: none;
    stroke: rgba(245, 226, 188, 0.72);
    stroke-width: 1;
    stroke-linecap: round;
    stroke-linejoin: round;
    vector-effect: non-scaling-stroke;
    pointer-events: none;
}
.plate-view .organ-region.target,
.plate-view .organ-region.revealed,
.plate-view .organ-region.hinted,
.plate-view .organ-region.correct,
.plate-view .organ-region.wrong { opacity: 1; }
.plate-view .anatomy-region:hover { color: #d5a06f; filter: drop-shadow(0 0 3px rgba(79, 136, 123, 0.8)); }
.plate-view .anatomy-region:focus-visible { outline: none; color: #dfac76; filter: drop-shadow(0 0 4px var(--verdigris)); }
body[data-unit="skeleton"] .plate-view .anatomy-region:hover { color: #eee5ca; }
body[data-unit="skeleton"] .plate-view .anatomy-region:focus-visible { color: #f0e5c5; }
.plate-view .anatomy-region.target,
.plate-view .anatomy-region.revealed,
.plate-view .anatomy-region.hinted { color: var(--brass-light); filter: drop-shadow(0 0 7px #b57b32); }
.plate-view .anatomy-region.correct { color: var(--verdigris-bright); filter: drop-shadow(0 0 8px #3c8978); }
.plate-view .anatomy-region.wrong { color: #dc746d; filter: drop-shadow(0 0 7px #9d2f2d); }
.plate-view .anatomy-region.hinted { animation: anatomical-pulse 0.72s ease-in-out 2; }
body[data-unit="organs"] .plate-view .anatomy-region.target,
body[data-unit="organs"] .plate-view .anatomy-region.revealed,
body[data-unit="organs"] .plate-view .anatomy-region.hinted {
    color: #247d9e;
    filter: drop-shadow(0 0 8px rgba(36, 125, 158, 0.9));
}
body[data-unit="organs"] .plate-view .anatomy-region.target .organ-hit,
body[data-unit="organs"] .plate-view .anatomy-region.revealed .organ-hit,
body[data-unit="organs"] .plate-view .anatomy-region.hinted .organ-hit {
    stroke: rgba(36, 151, 194, 0.24);
}
body[data-unit="organs"] .plate-view .anatomy-region.target .organ-tube,
body[data-unit="organs"] .plate-view .anatomy-region.revealed .organ-tube,
body[data-unit="organs"] .plate-view .anatomy-region.hinted .organ-tube {
    stroke-width: calc((var(--organ-width, 8) + 4) * 1px);
}
body[data-unit="organs"] .plate-view .anatomy-region.target .organ-fill,
body[data-unit="organs"] .plate-view .anatomy-region.revealed .organ-fill,
body[data-unit="organs"] .plate-view .anatomy-region.hinted .organ-fill { stroke-width: 2.2; }
body[data-unit="organs"] .plate-view .anatomy-region.correct {
    color: var(--verdigris-bright);
    filter: drop-shadow(0 0 8px #3c8978);
}
body[data-unit="organs"] .plate-view .anatomy-region.wrong {
    color: #dc746d;
    filter: drop-shadow(0 0 7px #9d2f2d);
}
body[data-unit="nervous"] .plate-view .anatomy-region.target,
body[data-unit="nervous"] .plate-view .anatomy-region.revealed,
body[data-unit="nervous"] .plate-view .anatomy-region.hinted {
    color: #167da4;
    filter: drop-shadow(0 0 8px rgba(22, 125, 164, 0.9));
}
body[data-unit="nervous"] .plate-view .anatomy-region.target .nerve-line,
body[data-unit="nervous"] .plate-view .anatomy-region.revealed .nerve-line,
body[data-unit="nervous"] .plate-view .anatomy-region.hinted .nerve-line {
    stroke-width: 7px;
}
body[data-unit="nervous"] .plate-view .anatomy-region.target .nerve-hit,
body[data-unit="nervous"] .plate-view .anatomy-region.revealed .nerve-hit,
body[data-unit="nervous"] .plate-view .anatomy-region.hinted .nerve-hit {
    stroke: rgba(36, 151, 194, 0.24);
    stroke-width: 22px;
}
body[data-unit="nervous"] .plate-view .anatomy-region.correct {
    color: var(--verdigris-bright);
    filter: drop-shadow(0 0 8px #3c8978);
}
body[data-unit="nervous"] .plate-view .anatomy-region.wrong {
    color: #dc746d;
    filter: drop-shadow(0 0 7px #9d2f2d);
}
.plate-view .engraving-line { fill: none; stroke: #756f5e; stroke-width: 0.65; opacity: 0.48; vector-effect: non-scaling-stroke; pointer-events: none; }
.plate-view .plate-copy { fill: #706957; font-family: Georgia, serif; font-size: 11px; letter-spacing: 2px; text-transform: uppercase; }

/* Completion ------------------------------------------------------------ */

.overlay {
    position: fixed;
    z-index: 20;
    inset: 0;
    display: grid;
    place-items: center;
    padding: 22px;
    background: rgba(10, 6, 7, 0.82);
    backdrop-filter: blur(4px);
}
.completion-card {
    width: min(540px, 100%);
    padding: 34px;
    color: var(--plate-ink);
    background: var(--paper);
    border: 1px solid #8e8061;
    box-shadow: 0 28px 80px rgba(0, 0, 0, 0.55), inset 0 0 0 6px var(--paper), inset 0 0 0 7px #a99e83;
}
.completion-card .kicker { color: #7b583b; }
.completion-card h2 { margin: 9px 0 10px; font: 400 40px/1.03 var(--display); }
.completion-card > p:not(.kicker) { color: #6d6757; font-size: 14px; line-height: 1.5; }
.completion-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin: 24px 0; background: #a99f88; border: 1px solid #a99f88; }
.completion-stats span { display: grid; gap: 4px; padding: 13px 8px; text-align: center; background: var(--paper-light); color: #6c6656; font: 500 9px/1.3 var(--mono); text-transform: uppercase; }
.completion-stats b { color: var(--plate-ink); font-size: 18px; }
.completion-actions { display: flex; gap: 8px; }
.completion-actions .instrument-btn { color: var(--plate-ink); border-color: #857a63; }

/* Anatomist's Casebook -------------------------------------------------- */

.casebook-overlay { z-index: 30; }
.casebook-card {
    width: min(480px, 100%);
    padding: 32px 34px 28px 54px;
    position: relative;
    color: var(--plate-ink);
    background:
        linear-gradient(90deg, transparent 31px, rgba(142, 75, 69, 0.45) 32px, transparent 33px),
        repeating-linear-gradient(var(--paper-light) 0 31px, rgba(79, 136, 123, 0.15) 31px 32px),
        var(--paper-light);
    border: 1px solid #8e8061;
    box-shadow: 0 28px 80px rgba(0, 0, 0, 0.6), inset 0 0 0 6px rgba(207, 194, 163, 0.34);
}
.casebook-card::before {
    content: 'CASE  ·  NOMENCLATURE';
    position: absolute;
    top: 15px;
    right: 18px;
    color: rgba(142, 75, 69, 0.72);
    font: 600 8px/1 var(--mono);
    letter-spacing: 0.15em;
}
.casebook-card .kicker { color: #7b583b; margin-bottom: 7px; }
.casebook-card h2 { margin: 0 0 8px; font: 400 37px/1.05 var(--display); }
.casebook-instruction { margin: 0 0 17px; color: #6d6757; font-size: 13px; line-height: 1.5; }
.casebook-target {
    display: block;
    margin-bottom: 11px;
    color: #6d352f;
    font: 400 30px/1.1 var(--display);
}
.casebook-dots {
    min-height: 24px;
    margin-bottom: 14px;
    color: var(--verdigris);
    font: 600 18px/1 var(--mono);
    letter-spacing: 0.25em;
}
.casebook-card label {
    display: block;
    margin-bottom: 5px;
    color: #716958;
    font: 600 9px/1 var(--mono);
    letter-spacing: 0.13em;
    text-transform: uppercase;
}
.casebook-card input {
    width: 100%;
    height: 45px;
    padding: 0 11px;
    color: var(--plate-ink);
    background: rgba(255, 253, 243, 0.68);
    border: 1px solid #91866e;
    border-radius: 0;
    font-size: 16px;
}
.casebook-card input.shake { animation: casebook-shake 0.35s ease; }
.casebook-feedback { min-height: 35px; padding-top: 8px; color: #6d6757; font-size: 12px; }
.casebook-feedback.correct { color: #356b60; }
.casebook-feedback.incorrect { color: #98413c; }
.casebook-actions { display: flex; align-items: center; gap: 12px; }
.casebook-cancel {
    min-height: 40px;
    color: #665f50;
    background: transparent;
    border: 0;
    border-bottom: 1px solid #8b816b;
    font-size: 11px;
}

@keyframes plate-turn {
    from { opacity: 0; transform: perspective(900px) rotateY(-4deg); }
    to { opacity: 1; transform: perspective(900px) rotateY(0); }
}
@keyframes anatomical-pulse { 50% { color: #efd58d; filter: drop-shadow(0 0 12px #b57b32); } }
@keyframes lens-settle {
    from { opacity: 0.72; transform: scale(0.985); }
    to { opacity: 1; transform: scale(1); }
}
@keyframes casebook-shake {
    25% { transform: translateX(-6px); }
    75% { transform: translateX(6px); }
}

/* Responsive ------------------------------------------------------------ */

@media (max-width: 820px) {
    .start-screen::before, .start-screen::after { width: 17vw; opacity: 0.42; }
    .setup-grid { grid-template-columns: 1fr 1fr; }
    .setup-grid > .primary-btn { grid-column: 2; }
    .lecture-rail { grid-template-columns: 1fr auto; gap: 10px; }
    .rail-title { display: none; }
    .stats { justify-content: start; gap: 13px; }
    .theatre-layout { grid-template-columns: 1fr; }
    .question-panel { padding: 24px 20px 18px; border-right: 0; border-bottom: 1px solid #654129; }
    .question-panel h2 { min-height: 0; font-size: clamp(31px, 8vw, 45px); }
    .prompt-support { min-height: 0; margin: 10px 0 16px; }
    .feedback { min-height: 3.5em; }
    .question-panel::after, .keyboard-note { display: none; }
    .plate-stage { padding: 18px 12px 28px; }
    .folio { min-height: 0; padding: 19px 18px 14px; }
    .plate-view { height: 69svh; min-height: 520px; }
}

@media (max-width: 560px) {
    .start-screen { justify-content: flex-start; padding: 72px 14px 34px; }
    .library-link { left: 16px; }
    .theatre-mark { margin-bottom: 13px; }
    .start-screen h1 { font-size: clamp(48px, 16vw, 70px); }
    .subtitle { margin-bottom: 23px; font-size: 14px; }
    .admission-card { padding: 22px 18px 18px; }
    .card-heading h2 { font-size: 27px; }
    .setup-grid { grid-template-columns: 1fr; }
    .setup-grid > .primary-btn { grid-column: 1; }
    .ledger { grid-template-columns: auto 1fr; }
    .ledger strong { grid-column: 1 / -1; }
    .lecture-rail { min-height: 58px; padding: 8px 10px; }
    .stats { gap: 8px; }
    .stats span { font-size: 7px; }
    .stats b { font-size: 12px; }
    .quiet-btn { min-height: 34px; padding: 0 10px; font-size: 12px; }
    .question-panel { padding: 20px 16px 15px; }
    .feedback { padding: 9px 0; font-size: 11.5px; }
    .plate-tab { min-width: 0; width: 50%; }
    .plate-tabs { width: 100%; }
    .plate-controls { align-items: stretch; flex-direction: column-reverse; gap: 7px; margin-bottom: 8px; }
    .focus-toggle { align-self: flex-end; margin-bottom: 0; }
    .plate-view { height: 64svh; min-height: 480px; }
    .plate-caption { font-size: 7.5px; }
    .completion-card { padding: 28px 22px; }
    .completion-card h2 { font-size: 34px; }
    .completion-stats { grid-template-columns: 1fr; }
    .completion-actions { flex-direction: column; }
    .casebook-card { padding: 31px 22px 24px 42px; }
    .casebook-card h2 { font-size: 32px; }
    .casebook-actions { align-items: stretch; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}