:root{color-scheme:light;--bg:#f6f7f4;--panel:#fff;--ink:#16201d;--muted:#66736f;--line:#dce3df;--brand:#0f766e;--brand2:#2563eb;--bad:#b42318;--good:#15803d;--warn:#b45309}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--ink)}button,input,select{font:inherit}button{border:0;background:var(--brand);color:#fff;border-radius:8px;padding:11px 14px;font-weight:700}button.ghost{background:#eef3f1;color:var(--ink)}button:disabled{opacity:.5}.shell{max-width:1180px;margin:0 auto;padding:18px}.hidden{display:none!important}.auth-panel{max-width:420px;margin:8vh auto;background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:22px;box-shadow:0 12px 30px rgba(31,41,55,.08)}.brand{display:flex;gap:14px;align-items:center;margin-bottom:18px}.mark{width:44px;height:44px;border-radius:8px;background:var(--brand);display:grid;place-items:center;color:#fff;font-weight:800}.brand h1,.topbar h1{margin:0;font-size:22px}.brand p,.topbar p{margin:4px 0 0;color:var(--muted);font-size:13px}.tabs{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:12px 0}.tabs button{background:#eef3f1;color:var(--ink)}.tabs button.active{background:var(--brand);color:#fff}.form{display:grid;gap:12px}.form label{display:grid;gap:6px;font-weight:650}.form input,.toolbar select{border:1px solid var(--line);border-radius:8px;padding:12px;background:#fff}.msg{min-height:22px;color:var(--bad)}.topbar{display:flex;justify-content:space-between;align-items:center;margin:4px 0 14px}.toolbar{display:grid;grid-template-columns:1fr 1fr auto;gap:10px;margin-bottom:14px}.segmented{display:flex;background:#e9efec;border-radius:8px;padding:4px;gap:4px}.segmented button{background:transparent;color:var(--ink);padding:8px 10px}.segmented button.active{background:#fff;color:var(--brand);box-shadow:0 1px 4px rgba(0,0,0,.08)}.quiz-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:14px}.question-card,.answer-card{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:18px}.q-meta{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:14px}.q-meta span{background:#edf6f5;color:var(--brand);padding:4px 8px;border-radius:6px}.q-meta button{margin-left:auto;background:#fff7ed;color:var(--warn);border:1px solid #fed7aa;padding:6px 10px}.q-meta button.on{background:#f59e0b;color:#fff}.question-card h2{font-size:19px;line-height:1.58;margin:16px 0;white-space:pre-wrap}.options{display:grid;gap:10px}.option{display:flex;gap:10px;align-items:flex-start;width:100%;text-align:left;background:#fff;color:var(--ink);border:1px solid var(--line);font-weight:600}.option .letter{flex:0 0 28px;height:28px;border-radius:50%;background:#e9efec;display:grid;place-items:center;color:var(--brand)}.option.selected{border-color:var(--brand);box-shadow:0 0 0 2px rgba(15,118,110,.12)}.option.correct{border-color:var(--good);background:#f0fdf4}.option.wrong{border-color:var(--bad);background:#fff5f5}.result{margin-top:14px;border:1px solid var(--line);border-left:4px solid var(--brand2);border-radius:8px;padding:12px;background:#f8fafc;line-height:1.55}.result.good{border-left-color:var(--good)}.result.bad{border-left-color:var(--bad)}.result.warn{border-left-color:var(--warn)}.actions{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px;margin-top:16px}.answer-head{display:flex;justify-content:space-between;color:var(--muted);margin-bottom:10px}.answer-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:7px;max-height:62vh;overflow:auto}.answer-grid button{padding:8px 0;background:#eef3f1;color:var(--ink);border:1px solid transparent}.answer-grid button.current{border-color:var(--brand);background:#dff5f1}.answer-grid button.done{background:#dbeafe;color:#1d4ed8}.answer-grid button.bad{background:#fee2e2;color:#991b1b}.answer-grid button.fav{box-shadow:inset 0 -3px #f59e0b}@media(max-width:860px){.shell{padding:12px;padding-bottom:calc(16px + env(safe-area-inset-bottom))}.toolbar{grid-template-columns:1fr}.quiz-layout{grid-template-columns:1fr}.answer-card{order:2}.question-card{padding:15px}.question-card h2{font-size:17px}.actions{position:sticky;bottom:0;background:linear-gradient(transparent,#fff 30%);padding-top:18px}.answer-grid{grid-template-columns:repeat(8,1fr);max-height:220px}}