:root{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--bg:#111827;--panel:#1f2937;--line:#374151;--fg:#f3f4f6;--muted:#9ca3af;--accent:#fbbf24;--ok:#22c55e;--bad:#ef4444}*{box-sizing:border-box}html,body{background:var(--bg);color:var(--fg);margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Noto Sans CJK TC,PingFang TC,sans-serif}.app{max-width:720px;margin:0 auto;padding:0 12px 48px}.topbar{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;padding:12px 0;display:flex}.brand{color:var(--accent);font-size:1.1rem;font-weight:700;text-decoration:none}nav a{color:var(--muted);margin-left:14px;text-decoration:none}main{padding-top:16px}h2{margin:0 0 8px}h3{margin:18px 0 6px;font-size:1rem}section{margin-bottom:12px}.lede{font-size:1.05rem}.muted{color:var(--muted)}.small{font-size:.85rem}.error{color:var(--bad)}.status{background:var(--panel);border-radius:8px;padding:8px 10px}.zh{font-family:Noto Sans CJK TC,PingFang TC,Microsoft JhengHei,BopomofoRuby,system-ui,sans-serif}.huge{font-size:3rem;line-height:1.2}a.button,.button,button{font:inherit;color:var(--fg);background:var(--panel);border:1px solid var(--line);cursor:pointer;border-radius:12px;justify-content:center;align-items:center;min-height:48px;padding:12px 16px;text-decoration:none;display:inline-flex}button:disabled{opacity:.5;cursor:default}button.primary,.primary{background:var(--accent);color:#111827;border-color:var(--accent);font-weight:600}button.big,.big{min-height:64px;padding:18px 28px;font-size:1.4rem}button.small,.small.button{min-height:32px;padding:4px 10px;font-size:.85rem}button.link{min-height:0;color:var(--fg);background:0 0;border:none;padding:0;text-decoration:underline}button.active{border-color:var(--accent)}input[type=text],input:not([type]),input[type=number]{font:inherit;background:var(--panel);color:var(--fg);border:1px solid var(--line);border-radius:8px;min-height:44px;padding:10px}.row{align-items:center;gap:10px;margin:8px 0;display:flex}.row.wrap{flex-wrap:wrap}.check{margin:6px 0;display:block}.module-grid{grid-template-columns:1fr;gap:10px;margin:12px 0;display:grid}.module-card{background:var(--panel);border:1px solid var(--line);color:var(--fg);border-radius:12px;flex-direction:column;gap:4px;min-height:64px;padding:14px;text-decoration:none;display:flex}.module-card b{font-size:1.05rem}.drill-head{color:var(--muted);justify-content:space-between;margin-bottom:8px;display:flex}.drill-prompt{text-align:center;margin:10px 0 16px}.prompt-text{font-size:3rem}.play{font-size:1.3rem}.play.big{border-radius:60px;width:120px;height:120px;font-size:2.4rem}.options{grid-template-columns:1fr 1fr;gap:10px;display:grid}.options.tones{grid-template-columns:1fr 1fr}.option{border-width:2px;min-height:64px;font-size:1.5rem}.option.right{border-color:var(--ok);box-shadow:0 0 0 2px var(--ok) inset}.option.wrong{border-color:var(--bad);box-shadow:0 0 0 2px var(--bad) inset}.audio-options{grid-template-columns:1fr}.audio-option{border:2px solid #0000;border-radius:12px;align-items:center;gap:10px;padding:6px;display:flex}.audio-option.right{border-color:var(--ok)}.audio-option.wrong{border-color:var(--bad)}.audio-option .option{flex:1;font-size:1.1rem}.feedback{background:var(--panel);border-left:6px solid var(--line);border-radius:12px;margin-top:16px;padding:12px}.feedback.ok{border-left-color:var(--ok)}.feedback.bad{border-left-color:var(--bad)}.feedback-line{font-size:1.1rem}.feedback-actions{justify-content:flex-end;gap:10px;margin-top:10px;display:flex}.zh-keyboard{margin:10px 0}.zh-display{text-align:center;background:var(--panel);border-radius:10px;min-height:56px;margin-bottom:8px;padding:6px;font-size:2rem}.key-row{flex-wrap:wrap;justify-content:center;gap:6px;margin-bottom:6px;display:flex}.key{min-width:44px;min-height:44px;padding:0;font-size:1.3rem}.key.wide{min-width:96px}.start,.summary{text-align:center;padding:24px 0}.table{border-collapse:collapse;width:100%;margin:8px 0}.table td,.table th{border-bottom:1px solid var(--line);text-align:left;vertical-align:top;padding:6px 8px}tr.band-sweet td{background:#22c55e26}tr.band-hard td{opacity:.8}.contour-plot{background:var(--panel);border-radius:10px;width:100%;height:auto;margin:10px 0}.probs{margin:8px 0}.prob-row{grid-template-columns:64px 1fr 48px;align-items:center;gap:8px;margin:4px 0;display:grid}.bar{background:var(--line);border-radius:7px;height:14px;overflow:hidden}.fill{height:100%}.record{min-width:160px;font-size:1.3rem}.record.on{background:var(--bad);border-color:var(--bad);color:#fff}.record-row{align-items:center;gap:10px;margin:12px 0;display:flex}.target{text-align:center}.stats dt{color:var(--muted);margin-top:8px}.stats dd{margin:2px 0 0}.tabs button{min-height:40px}.unknown-words{margin-top:6px;line-height:1.8}pre{white-space:pre-wrap;background:var(--panel);border-radius:8px;padding:8px}@media (min-width:520px){.module-grid{grid-template-columns:1fr 1fr}}.pitch-lane{background:var(--panel);border-radius:10px;width:100%;max-width:420px;margin:8px auto;display:block}.lane-advice{margin:6px 0;padding-left:18px}.lane-advice li{margin:3px 0}.lane-cues{flex-wrap:wrap;gap:8px;margin:6px 0;display:flex}.lane-cue{background:var(--line);border-radius:999px;padding:3px 8px;font-size:.85rem}.lane-cue.ok{background:var(--good,#15803d);color:#fff}.lane-cue.miss{background:var(--bad);color:#fff}.matched{font-weight:600}