:root {
  --bg: #f3f2ed; --panel: #fffefa; --ink: #23352e; --muted: #66746b; --line: #e3e6dd; --accent: #326952;
  --bone: #dccca8; --muscle: #ad5148; --nerve: #e8b945; --artery: #cf3e4f; --organ: #be7979;
  --vein: #587dc4; --brain: #d8b4ac; --tract: #67b489; --function: #41baa6;
  --paralysed: #d6304c; --weakened: #ed9c32; --lesion: #8560d4;
  font-family: "Avenir Next", "Segoe UI", system-ui, sans-serif; color: var(--ink); background: var(--bg); font-size: 14px;
}
* { box-sizing: border-box; }
body { margin: 0; height: 100vh; height: 100dvh; display: flex; flex-direction: column; }
button, input, select { font: inherit; }
button { cursor: pointer; color: inherit; transition: background .15s, border-color .15s, color .15s; }
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible { outline: 3px solid #7baf95; outline-offset: 3px; }
button:disabled { cursor: default; }
a { color: var(--accent); text-decoration-color: #9ab8a4; text-underline-offset: 3px; }
a:hover { color: #163d2d; }
.la { color: var(--muted); font-family: Georgia, serif; font-style: italic; font-size: .94em; }
header { display: flex; align-items: center; gap: 24px; padding: 18px 24px; flex-shrink: 0; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { flex-shrink: 0; color: #294c3d; }
.brand h1 { margin: 0; font: 600 25px/1.2 Georgia, serif; letter-spacing: -.7px; }
.brand p { margin: 4px 0 0; font-size: 10px; letter-spacing: .15px; color: var(--muted); }
.region-pick { display: flex; flex-direction: column; gap: 4px; font-size: 10px; color: var(--muted); text-transform: uppercase; letter-spacing: 1.1px; margin-left: auto; }
.region-pick select { font-size: 12px; font-weight: 600; color: var(--ink); border: 0; border-bottom: 1px solid #cbd3c8; padding: 3px 24px 5px 0; background: transparent; max-width: 205px; text-transform: none; }
.modes, .lang { display: flex; gap: 3px; padding: 4px; background: #e7eae2; border-radius: 10px; }
.modes button, .lang button { border: 0; border-radius: 7px; background: transparent; padding: 9px 15px; font-size: 12px; font-weight: 600; }
.modes button.active { background: #2e5542; color: #fffefa; box-shadow: 0 2px 5px #23432f20; }
.lang button { padding: 9px 10px; font-size: 11px; }
.lang button.active { background: var(--panel); box-shadow: 0 2px 5px #23432f12; }
.modes button:hover:not(.active), .lang button:hover:not(.active) { background: #d7ddd2; }
main { flex: 1; min-height: 0; display: grid; grid-template-columns: 234px minmax(0, 1fr) 358px; grid-template-rows: minmax(0, 1fr); gap: 14px; padding: 0 20px 14px; }
#sidebar, #panel { background: var(--panel); border: 1px solid var(--line); border-radius: 16px; min-height: 0; overflow: hidden; }
#sidebar { padding: 18px 12px 10px; display: flex; flex-direction: column; gap: 14px; }
.sidebar-heading { padding: 0 4px; display: flex; justify-content: space-between; align-items: center; font-size: 12px; font-weight: 600; }
#structure-count { border: 1px solid var(--line); border-radius: 6px; padding: 2px 7px; font-size: 10px; font-variant-numeric: tabular-nums; color: var(--muted); }
#search { width: 100%; border: 1px solid var(--line); border-radius: 9px; padding: 11px 10px; background: #f5f6f0; font-size: 11px; color: var(--ink); }
#search::placeholder { color: #758277; }
#layers { border: 0; border-bottom: 1px solid var(--line); margin: 0; padding: 4px 3px 15px; display: grid; grid-template-columns: 1fr 1fr; gap: 9px 6px; font-size: 11px; }
#layers legend { padding: 0 0 9px; font-size: 10px; text-transform: uppercase; letter-spacing: 1.3px; color: var(--muted); }
#layers label { display: flex; align-items: center; gap: 5px; cursor: pointer; }
#layers label[hidden] { display: none; }
input[type="checkbox"] { accent-color: var(--accent); width: 12px; height: 12px; margin: 0; cursor: pointer; }
.dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0; }
.dot.bone { background: var(--bone); border: 1px solid #a49470; } .dot.muscle { background: var(--muscle); } .dot.nerve { background: var(--nerve); }
.dot.artery { background: var(--artery); } .dot.organ { background: var(--organ); } .dot.vein { background: var(--vein); }
.dot.brain { background: var(--brain); } .dot.tract { background: var(--tract); } .dot.function { background: var(--function); }
.dot.paralysed { background: var(--paralysed); } .dot.weakened { background: var(--weakened); } .dot.lesion { background: var(--lesion); } .dot.spared { background: #98a3a0; }
#list { overflow-y: auto; flex: 1; min-height: 0; padding-right: 3px; }
#list h3 { margin: 16px 4px 7px; font-size: 9px; line-height: 1.5; font-weight: 600; text-transform: uppercase; letter-spacing: 1px; color: #748174; }
#list h3:first-child { margin-top: 0; }
#list button { display: block; width: 100%; text-align: left; border: 1px solid transparent; background: transparent; padding: 9px 8px; border-radius: 8px; font-size: 12px; line-height: 1.4; }
#list button:hover { background: #f0f3eb; }
#list button.active { background: #e9f0e5; border-color: #dae5d4; color: #285340; font-weight: 600; }
#list button small { display: block; color: #788175; font-size: 10px; font-weight: 400; margin-top: 3px; }
.empty-search { color: var(--muted); font-size: 12px; padding: 8px; }
#stage { position: relative; min-width: 0; min-height: 0; border-radius: 18px; overflow: hidden; background: radial-gradient(ellipse at 48% 42%, #354942, #1a2b29 75%); box-shadow: inset 0 0 80px #07161250; }
#stage::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(#b6c6be07 1px, transparent 1px), linear-gradient(90deg, #b6c6be07 1px, transparent 1px); background-size: 48px 48px; pointer-events: none; }
#viewer { position: absolute; inset: 52px 0 74px; }
#viewer canvas { display: block; touch-action: none; }
.stage-heading { position: absolute; left: 24px; top: 24px; pointer-events: none; max-width: calc(100% - 45px); color: #f0f1e6; }
.eyebrow { font-size: 9px; font-weight: 600; text-transform: uppercase; letter-spacing: 2px; }
.stage-heading .eyebrow { color: #9db4a7; }
.stage-heading h2 { margin: 8px 0 5px; font: 400 27px/1.15 Georgia, serif; letter-spacing: -.5px; }
.stage-heading p { font-size: 10px; color: #c3d1c8; margin: 0; }
.view-tools { position: absolute; right: 18px; top: 125px; display: flex; flex-direction: column; gap: 5px; }
.view-tools button, #reset-view { border: 1px solid #b0c2b52b; background: #152825b8; color: #d7e1d8; backdrop-filter: blur(8px); border-radius: 8px; padding: 8px 11px; font-size: 10px; min-height: 32px; }
.view-tools button:hover, #reset-view:hover, .zoom-tools button:hover { background: #526c5d; color: #fff; }
.model-tools { position: absolute; right: 18px; bottom: 98px; display: flex; flex-direction: column; align-items: flex-end; gap: 12px; color: #c1d0c5; }
.model-tools label { display: flex; gap: 6px; align-items: center; font-size: 9px; background: #152825bd; padding: 8px; border-radius: 7px; }
.zoom-tools { display: flex; flex-direction: column; border: 1px solid #b0c2b52b; border-radius: 8px; overflow: hidden; }
.zoom-tools button { background: #152825b8; color: #d7e1d8; border: 0; width: 32px; height: 32px; font-size: 20px; }
.zoom-tools button + button { border-top: 1px solid #b0c2b52b; }
.orbit-hint { position: absolute; bottom: 12px; left: 24px; color: #9aafa3; font-size: 9px; letter-spacing: .1px; pointer-events: none; }
#tooltip { position: absolute; pointer-events: none; background: #fffef9f2; border: 1px solid #d7e2d5; padding: 9px 12px; color: var(--ink); border-radius: 9px; font-size: 11px; max-width: 280px; z-index: 5; box-shadow: 0 8px 20px #05120c33; }
#legend { position: absolute; bottom: 49px; left: 20px; max-width: calc(100% - 125px); font-size: 9px; display: flex; gap: 9px 12px; flex-wrap: wrap; color: #d5e0d6; background: #152825ad; padding: 9px 11px; border: 1px solid #b0c2b51a; border-radius: 8px; }
#legend span { display: inline-flex; align-items: center; gap: 5px; }
#reset-view { position: absolute; right: 18px; bottom: 49px; max-width: 100px; }
#panel { display: flex; flex-direction: column; }
#card { padding: 23px 23px 18px; overflow-y: auto; flex: 1 1 60%; min-height: 0; font-size: 12px; line-height: 1.7; }
#card h2 { margin: 10px 0 6px; font: 400 27px/1.2 Georgia, serif; letter-spacing: -.6px; }
#card .names { color: var(--muted); font-size: 11px; padding-bottom: 17px; border-bottom: 1px solid var(--line); margin-bottom: 16px; }
#card .badge { display: inline-block; font-size: 8px; font-weight: 600; text-transform: uppercase; letter-spacing: 1px; padding: 4px 8px; border-radius: 5px; color: #fff; }
.badge.bone { background: #877751; } .badge.muscle { background: var(--muscle); } .badge.nerve { background: #997818; } .badge.artery { background: var(--artery); }
.badge.organ { background: #9d5a61; } .badge.vein { background: #4665a2; } .badge.brain { background: #9c6a5f; } .badge.tract { background: #438364; } .badge.function { background: #238977; }
#card dl { margin: 12px 0; }
#card dt { font-size: 9px; color: #6e7d6e; text-transform: uppercase; letter-spacing: 1.2px; margin-top: 19px; font-weight: 600; }
#card dd { margin: 5px 0 0; }
#card ul { margin: 3px 0; padding-left: 17px; }
#card .seg { font-family: ui-monospace, monospace; font-size: 10px; background: #eff1e6; border: 1px solid #e0e5d6; border-radius: 4px; padding: 1px 5px; white-space: nowrap; }
#card .note { color: var(--muted); font-size: 11px; }
.clinical { background: #f9eee7; border-left: 2px solid #c68670; padding: 12px 14px; border-radius: 0 8px 8px 0; margin: 19px 0; font-size: 11px; }
.actions { display: flex; gap: 7px; flex-wrap: wrap; margin-top: 18px; }
.actions button, .start-button { border: 1px solid #d4dfce; background: #edf2e7; border-radius: 8px; padding: 9px 12px; font-size: 11px; }
.actions button:hover { background: #dce8d3; }
.actions button.primary { background: var(--lesion); border-color: var(--lesion); color: #fff; }
.status-list li { margin-bottom: 5px; }
.status-list .paralysed { color: var(--paralysed); font-weight: 600; } .status-list .weakened { color: #a76000; font-weight: 600; }
.empty-card { padding: 15px 0 20px; }
.empty-card .eyebrow { color: var(--muted); }
.empty-symbol { font: 70px/1 Georgia, serif; color: #8ba58b; margin: 35px 0 20px; }
#card .empty-card h2 { font-size: 30px; line-height: 1.2; }
.empty-card p { color: var(--muted); font-size: 12px; line-height: 1.85; margin: 16px 0 24px; }
.start-button { background: #2e5542; color: #fff; border-color: #2e5542; padding: 11px 15px; }
.start-button:hover { background: #3f7159; }
.start-button span { margin-left: 20px; }
.quiz-types { display: flex; flex-wrap: wrap; gap: 6px; margin: 16px 0 20px; }
.quiz-types button, .graph-tabs button { border: 1px solid var(--line); background: transparent; border-radius: 6px; padding: 7px 9px; font-size: 10px; }
.quiz-types button.active, .graph-tabs button.active { background: #e8efe0; border-color: #cad9bc; color: #365734; }
.quiz-q { font-size: 15px; margin: 16px 0; line-height: 1.6; }
.quiz-detail { background: #f2f4eb; border-radius: 8px; padding: 13px; margin: 10px 0 16px; }
.quiz-opts { display: grid; gap: 8px; }
.quiz-opts button { text-align: left; border: 1px solid var(--line); background: #fffefa; border-radius: 9px; padding: 13px; font-size: 12px; }
.quiz-opts button:hover:not(:disabled) { background: #f0f4e9; border-color: #8ba77c; }
.quiz-opts button:disabled { color: var(--ink); }
.quiz-opts button.right { background: #e6f2df; border-color: #81ab63; }
.quiz-opts button.wrongpick { background: #f9e5e5; border-color: #cb7274; }
.quiz-feedback { margin-top: 15px; font-weight: 600; }
.score { float: right; color: var(--muted); font-size: 11px; padding: 2px 7px; background: #eff2e9; border-radius: 5px; }
#graph-wrap { border-top: 1px solid var(--line); flex: 1 1 40%; display: flex; flex-direction: column; min-height: 220px; background: #fbfcf6; }
.graph-tabs { display: flex; gap: 5px; align-items: center; padding: 14px 16px 8px; flex-wrap: wrap; }
.graph-title { width: 100%; font-size: 9px; text-transform: uppercase; letter-spacing: 1.4px; color: #6e7d6e; margin-bottom: 5px; }
.graph-tabs button { padding: 5px 8px; font-size: 9px; }
.graph-tabs button.icon { margin-left: auto; font-size: 15px; padding: 1px 6px; }
#graph { flex: 1; min-height: 0; }
body[data-mode="quiz"] #graph-wrap { display: none; }
body.graph-max #graph-wrap { position: fixed; inset: 4vh 4vw; z-index: 20; background: var(--panel); border: 1px solid var(--line); border-radius: 16px; box-shadow: 0 20px 60px #10231950; }
body.graph-max::after { content: ""; position: fixed; inset: 0; background: #10231980; z-index: 19; }
footer { padding: 0 24px 12px; flex-shrink: 0; font-size: 9px; color: #6d7a6d; line-height: 1.45; }
footer p { margin: 0 0 2px; }
footer strong { color: #8d967c; } footer .small { font-size: 8px; }
::-webkit-scrollbar { width: 5px; height: 5px; } ::-webkit-scrollbar-thumb { background: #cbd3c4; border-radius: 10px; }
@media (min-width: 1600px) { main { grid-template-columns: 272px minmax(0, 1fr) 415px; } :root { font-size: 15px; } #card { font-size: 13px; } #list button { font-size: 12px; } }
@media (max-width: 1120px) {
  body { height: auto; min-height: 100dvh; }
  header { flex-wrap: wrap; gap: 16px; padding: 18px 20px; }
  .brand { flex: 1; } .region-pick { margin-left: 0; } .modes { margin-left: auto; }
  main { grid-template-columns: 230px minmax(0, 1fr); grid-template-rows: 660px auto; }
  #panel { grid-column: 1 / -1; display: grid; grid-template-columns: 1fr 1fr; }
  #card { max-height: 550px; } #graph-wrap { border-top: 0; border-left: 1px solid var(--line); min-height: 360px; }
  body[data-mode="quiz"] #panel { display: block; }
}
@media (max-width: 700px) {
  header { padding: 16px; gap: 14px 10px; }
  .brand h1 { font-size: 24px; } .brand p { font-size: 9px; } .brand-mark { width: 34px; height: 34px; }
  .brand { flex-basis: calc(100% - 100px); min-width: 0; order: 0; } .brand > div { min-width: 0; } .brand p { line-height: 1.4; } .lang { order: 1; flex-shrink: 0; }
  .region-pick { order: 2; flex: 1; min-width: 0; } .region-pick select { max-width: 185px; width: 100%; min-width: 0; }
  .modes { order: 3; margin-left: 0; } .modes button { padding: 9px 10px; font-size: 11px; }
  main { display: flex; flex-direction: column; padding: 0 12px 14px; gap: 12px; }
  #stage { order: 0; height: 66vh; min-height: 470px; max-height: 650px; flex-shrink: 0; }
  #sidebar { order: 1; height: 350px; flex-shrink: 0; }
  #layers { grid-template-columns: repeat(3, 1fr); }
  #panel { order: 2; display: flex; }
  #card { max-height: none; min-height: 240px; padding: 22px; }
  #graph-wrap { border-left: 0; border-top: 1px solid var(--line); height: 320px; min-height: 320px; flex: none; }
  .stage-heading { top: 22px; left: 22px; } .stage-heading h2 { font-size: 25px; }
  .view-tools { top: 119px; right: 12px; } .model-tools { right: 12px; }
  .view-tools button, #reset-view { min-height: 40px; } .zoom-tools button { width: 40px; height: 40px; }
  #list button { min-height: 44px; } #layers label { min-height: 25px; }
  #legend { left: 15px; max-width: calc(100% - 115px); } #reset-view { right: 12px; }
  .orbit-hint { left: 16px; font-size: 8px; max-width: calc(100% - 25px); }
  footer { padding: 0 17px 18px; }
}
@media (prefers-reduced-motion: reduce) { button { transition: none; } }