:root{--bg: #f6f7f5;--surface: #ffffff;--surface-soft: #f1f4f2;--ink: #1c2b28;--ink-soft: #5b6b67;--ink-faint: #8b9a96;--line: #e0e6e3;--brand: #0f766e;--brand-soft: #e1f5ee;--brand-deep: #085041;--accent: #b45309;--accent-soft: #fdf0e2;--danger: #b3261e;--danger-soft: #fcebeb;--ok: #0f6e56;--radius: 14px;--shadow: 0 1px 2px rgba(20, 40, 35, .06), 0 6px 20px rgba(20, 40, 35, .05)}*{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,Noto Sans SC,sans-serif;font-size:15px;line-height:1.6;-webkit-font-smoothing:antialiased}button{font-family:inherit;font-size:14px;cursor:pointer}input,textarea,select{font-family:inherit;font-size:14px;color:var(--ink)}.app{max-width:920px;margin:0 auto;padding:0 18px 96px}.topbar{position:sticky;top:0;z-index:10;background:#f6f7f5eb;backdrop-filter:blur(8px);border-bottom:1px solid var(--line);margin:0 -18px 20px;padding:10px 18px}.topbar-inner{max-width:920px;margin:0 auto;display:flex;align-items:center;gap:6px}.brand{font-weight:600;font-size:15px;color:var(--brand-deep);margin-right:auto;letter-spacing:.2px}.brand small{display:block;font-weight:400;font-size:11px;color:var(--ink-faint);letter-spacing:1px}.navbtn{border:1px solid transparent;background:transparent;color:var(--ink-soft);padding:6px 12px;border-radius:999px}.navbtn:hover{background:var(--surface-soft)}.navbtn.active{background:var(--brand);color:#fff}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);margin-bottom:16px}.card h2{margin:0 0 4px;font-size:17px;font-weight:600}.card h3{margin:18px 0 6px;font-size:14px;font-weight:600}.muted{color:var(--ink-soft);font-size:13px}.faint{color:var(--ink-faint);font-size:12px}.row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.spread{justify-content:space-between}.grid2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.grid4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}@media (max-width: 620px){.grid2,.grid4{grid-template-columns:repeat(2,minmax(0,1fr))}}.stat{background:var(--surface-soft);border-radius:10px;padding:12px 14px}.stat .num{font-size:22px;font-weight:600;color:var(--brand-deep);line-height:1.2}.stat .lbl{font-size:12px;color:var(--ink-soft)}.btn{border:1px solid var(--line);background:var(--surface);color:var(--ink);padding:9px 16px;border-radius:10px;font-weight:500;transition:background .15s,border-color .15s}.btn:hover:not(:disabled){background:var(--surface-soft);border-color:#cfd8d4}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-primary{background:var(--brand);border-color:var(--brand);color:#fff}.btn-primary:hover:not(:disabled){background:var(--brand-deep);border-color:var(--brand-deep)}.btn-danger{background:var(--danger-soft);border-color:#f0c9c6;color:var(--danger)}.btn-lg{padding:12px 24px;font-size:15px;border-radius:12px}.btn-rec{background:var(--danger);border-color:var(--danger);color:#fff}.btn-rec:hover:not(:disabled){background:#8f1e18;border-color:#8f1e18}.chip{display:inline-block;background:var(--surface-soft);border:1px solid var(--line);color:var(--ink-soft);border-radius:999px;padding:3px 10px;font-size:12px;margin:0 6px 6px 0}.chip.on{background:var(--brand-soft);border-color:var(--brand);color:var(--brand-deep)}.question-box{background:linear-gradient(180deg,#fff,#f8faf9);border:1px solid var(--line);border-left:3px solid var(--brand);border-radius:10px;padding:16px 18px;margin:14px 0}.question-box .q{font-size:17px;font-weight:500;color:var(--ink)}.question-box .zh{font-size:13px;color:var(--ink-soft);margin-top:4px}.bullets{margin:10px 0 0;padding-left:20px;color:var(--ink-soft);font-size:14px}.bullets li{margin-bottom:3px}.timer{font-variant-numeric:tabular-nums;font-size:40px;font-weight:600;letter-spacing:1px;color:var(--ink);line-height:1.1}.timer.warn{color:var(--accent)}.timer.over{color:var(--danger)}.wave{display:flex;align-items:flex-end;gap:3px;height:28px;margin:8px 0}.wave span{width:4px;background:var(--brand);border-radius:2px;animation:bounce .9s ease-in-out infinite}@keyframes bounce{0%,to{height:6px}50%{height:26px}}@media (prefers-reduced-motion: reduce){.wave span{animation:none;height:14px}}.transcript{background:var(--surface-soft);border-radius:10px;padding:14px 16px;min-height:76px;white-space:pre-wrap;font-size:14px;color:var(--ink);max-height:260px;overflow-y:auto}.scorebar{display:flex;align-items:center;gap:10px;margin-bottom:8px}.scorebar .name{width:76px;font-size:13px;color:var(--ink-soft);flex:none}.scorebar .track{flex:1;height:8px;background:var(--surface-soft);border-radius:4px;overflow:hidden}.scorebar .fill{height:100%;background:var(--brand);border-radius:4px}.scorebar .val{width:34px;text-align:right;font-size:13px;font-weight:600;font-variant-numeric:tabular-nums}.issue{border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:10px;padding:12px 14px;margin-bottom:10px;background:var(--accent-soft)}.issue .orig{text-decoration:line-through;color:var(--ink-soft)}.issue .fix{color:var(--brand-deep);font-weight:500}.issue .note{font-size:13px;color:var(--ink-soft);margin-top:4px}.model-answer{background:var(--brand-soft);border-radius:10px;padding:14px 16px;font-size:15px;line-height:1.75;color:#10312a}.field{margin-bottom:14px}.field label{display:block;font-size:13px;color:var(--ink-soft);margin-bottom:5px}.field input,.field select,.field textarea{width:100%;padding:9px 12px;border:1px solid var(--line);border-radius:10px;background:var(--surface);outline:none}.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--brand)}.notice{border-radius:10px;padding:11px 14px;font-size:13px;margin-bottom:14px}.notice.warn{background:var(--accent-soft);color:#7c3f06;border:1px solid #f3d9b8}.notice.err{background:var(--danger-soft);color:var(--danger);border:1px solid #f0c9c6}.notice.ok{background:var(--brand-soft);color:var(--brand-deep);border:1px solid #b9e3d4}.hist-item{border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin-bottom:10px;background:var(--surface)}.hist-head{display:flex;gap:10px;align-items:center;cursor:pointer}.hist-head .title{flex:1;min-width:0;font-size:14px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.band{background:var(--brand);color:#fff;border-radius:8px;padding:2px 9px;font-size:13px;font-weight:600;font-variant-numeric:tabular-nums}.center{text-align:center}.empty{text-align:center;padding:40px 20px;color:var(--ink-faint)}audio{width:100%;margin-top:8px}.divider{height:1px;background:var(--line);margin:16px 0}.pill-row{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0 2px}.kbd{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:var(--surface-soft);border:1px solid var(--line);border-radius:5px;padding:1px 5px;font-size:12px}