:root{--bg:#f7f6f2;--paper:#fff;--soft:#f1efe9;--ink:#1c1b19;--muted:#5e5b55;--line:#e4e0d8;--border:#8c877d;--accent:#0b6e78;--tint:#e3f1f2;--ok:#1a7a3a;--bad:#b3261e;--button-ink:#fff;color-scheme:light;font:16px/1.55 -apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;background:var(--bg);color:var(--ink)}
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minmax(0,1fr);gap:28px}.question-layout.no-exhibit{grid-template-columns:minmax(0,780px);justify-content:center}.question-stem{font-size:1.2rem;line-height:1.5;white-space:pre-wrap;margin:0 0 20px}.question-meta{font-size:.85rem;color:var(--muted);margin-bottom:14px}.option{display:flex;gap:12px;align-items:flex-start;padding:14px;border:1px solid var(--border);background:var(--paper);border-radius:9px;margin:10px 0;cursor:pointer}.option:has(input:checked){border-color:var(--accent);background:var(--tint);box-shadow:inset 0 0 0 1px var(--accent)}.option .letter{font-weight:600}.option p{margin:0}.exhibit{min-width:0}.exhibit-head{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-bottom:10px}.exhibit-head h2{font-size:1rem;margin:0}.exhibit-content{overflow:auto;border:1px solid var(--border);border-radius:9px;background:var(--paper)}pre{background:#14191f;color:#e6edf3;font:14px/1.55 ui-monospace,Consolas,monospace;white-space:pre;overflow:auto;padding:20px;margin:0;tab-size:8}table{border-collapse:collapse;min-width:100%;font-size:.95rem}td,th{padding:12px;text-align:left;border-bottom:1px solid var(--line);white-space:pre-wrap}th{background:var(--soft)}.topology{display:block;width:100%;min-width:530px;height:auto}.topology text{fill:var(--ink);font-family:inherit}.topology .wire{stroke:var(--muted);stroke-width:3}.topology .node{fill:var(--tint);stroke:var(--accent);stroke-width:2}.topology .label-bg{fill:var(--paper)}details{margin-top:14px}summary{cursor:pointer;color:var(--accent);min-height:36px}.session-actions{position:sticky;bottom:0;background:var(--bg);border-top:1px solid var(--line);padding:16px 0 max(16px,env(safe-area-inset-bottom));display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-top:24px}.session-actions .primary{margin-left:auto}.feedback{margin-top:24px;border-top:1px solid var(--line);padding-top:20px}.feedback h2.correct{color:var(--ok)}.feedback h2.incorrect{color:var(--bad)}.feedback p{white-space:pre-wrap}.rationale{border-top:1px solid var(--line);padding:12px 0}.rationale p{margin:6px 0}.guess{display:flex;gap:8px;align-items:center}.matching-row{padding:12px;border:1px solid var(--border);border-radius:8px;margin:10px 0}.matching-row select{margin-bottom:0}.target-bank{display:flex;gap:8px;flex-wrap:wrap}.target{border:1px dashed var(--border);padding:7px 12px;background:var(--soft);border-radius:8px;cursor:grab}.list-row{display:flex;gap:20px;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding:18px 0}.list-row p{margin:0}.list-row button{flex-shrink:0}.empty{padding:36px;border:1px dashed var(--border);border-radius:12px;margin:24px 0}.result-number{font-size:3rem;color:var(--accent)}#notice{position:sticky;top:0;z-index:5;background:var(--paper);border-bottom:2px solid var(--accent);margin:0;padding:14px 24px;max-width:none}dialog{width:min(1300px,96vw);max-height:94dvh;overflow:auto;background:var(--paper);color:var(--ink);border:1px solid var(--border);border-radius:12px;padding:20px}dialog::backdrop{background:#0009}.dialog-bar{display:flex;justify-content:space-between;gap:20px;position:sticky;top:0;background:var(--paper);padding-bottom:12px}.dialog-bar h2{margin:0}#expanded-exhibit pre{font-size:17px}#expanded-exhibit .topology{min-width:1100px}#expanded-exhibit{overflow:auto}.skip{position:absolute;left:-10000px}.skip:focus{left:12px;top:12px;background:var(--paper);padding:12px;z-index:10}
@media(max-width:850px){.question-layout{grid-template-columns:minmax(0,1fr)}.topics{grid-template-columns:minmax(0,1fr)}header{padding:14px 18px}.course span{display:none}main{padding:20px 16px 50px}.grid{gap:10px}.stat{padding:16px}.card{padding:18px}nav{gap:0;justify-content:space-between}nav button,nav a{padding:10px;font-size:.9rem}.resume{align-items:flex-start;flex-direction:column}.question-stem{font-size:1.18rem}}@media(max-width:420px){.grid{grid-template-columns:1fr}.stat{display:flex;align-items:center;gap:18px}.stat strong{font-size:1.7rem}.form-row{flex-direction:column;gap:0}.session-bar{font-size:.85rem}.session-actions button{padding:10px}.login h1{font-size:2rem}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
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.review-question .exhibit{margin:20px 0}.review-question .question-stem{margin-top:20px}.review-option{padding:12px 0;border-bottom:1px solid var(--line)}.review-mark{display:block;color:var(--accent);font-weight:600}.review-table{overflow:auto}.question-stem{font-weight:400;letter-spacing:normal}.review-question summary{white-space:pre-wrap}#view>button+button,#session>button+button{margin-left:10px}