:root{--bg:#f1f5f9;--card:#fff;--text:#0f172a;--text-muted:#64748b;--border:#e2e8f0;--primary:#4f46e5;--primary-dark:#4338ca;--primary-soft:#eef2ff;--right:#16a34a;--right-soft:#f0fdf4;--wrong:#dc2626;--wrong-soft:#fef2f2;--shadow:0 10px 30px #0f172a14}@media (prefers-color-scheme:dark){:root{--bg:#0b1220;--card:#111c30;--text:#e2e8f0;--text-muted:#94a3b8;--border:#1e2d44;--primary:#6366f1;--primary-dark:#818cf8;--primary-soft:#1b2540;--right:#4ade80;--right-soft:#0f2419;--wrong:#f87171;--wrong-soft:#2b1414;--shadow:0 10px 30px #0006}}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:radial-gradient(1200px 600px at 50% -200px, color-mix(in srgb, var(--primary) 14%, transparent), transparent), var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;line-height:1.6}.page{max-width:720px;margin:0 auto;padding:24px 16px 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var(--border);width:100%;color:var(--text);cursor:pointer;border-radius:14px;align-items:center;gap:14px;padding:14px 16px;font-size:16px;transition:border-color .12s,background .12s,transform .12s;display:flex}.option:hover{border-color:color-mix(in srgb, var(--primary) 55%, var(--border))}.option.selected{border-color:var(--primary);background:var(--primary-soft)}.option-key{background:var(--card);border:1px solid var(--border);width:30px;height:30px;color:var(--text-muted);border-radius:9px;flex:none;place-items:center;font-size:14px;font-weight:700;display:grid}.option-key.selected{background:var(--primary);border-color:var(--primary);color:#fff}.option-text{flex:1}.options-tf{grid-template-columns:1fr 1fr}.options-tf 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solid var(--primary);cursor:grab;background:#fff;border-radius:50%;width:30px;height:30px;box-shadow:0 2px 8px #0f172a40}.slider-input::-webkit-slider-thumb:active{cursor:grabbing}.slider-input::-moz-range-thumb{border:4px solid var(--primary);cursor:grab;background:#fff;border-radius:50%;width:22px;height:22px;box-shadow:0 2px 8px #0f172a40}.slider-scale{color:var(--text-muted);font-variant-numeric:tabular-nums;justify-content:space-between;margin-top:10px;font-size:13px;display:flex}.slider-hint{text-align:center;color:var(--text-muted);margin-top:14px;font-size:13px}.quiz-nav{justify-content:space-between;gap:12px;margin:18px 0;display:flex}.quiz-nav .btn{flex:1}.pager-card{padding:16px}.pager{flex-wrap:wrap;gap:8px;display:flex}.pager-dot{border:1px solid var(--border);background:var(--bg);width:34px;height:34px;color:var(--text-muted);cursor:pointer;border-radius:10px;font-size:13px;font-weight:600;transition:all 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