:root{--bg:#fff;--surface:#f6f7f9;--border:#e3e6ea;--text:#1f2937;--muted:#6b7280;--brand:#0f766e;--brand-soft:#e6f4f2;--accent:#ea580c;--good:#15803d;--ok:#b45309;--low:#b91c1c;color:var(--text);background:var(--bg);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5}@media (prefers-color-scheme:dark){:root{--bg:#111418;--surface:#1a1f25;--border:#2c333b;--text:#e5e7eb;--muted:#9ca3af;--brand:#2dd4bf;--brand-soft:#123a36;--accent:#fb923c;--good:#4ade80;--ok:#fbbf24;--low:#f87171}}body{background:var(--bg);margin:0}a{color:var(--brand)}main{flex-direction:column;gap:12px;max-width:680px;margin:0 auto;padding:20px 16px 24px;display:flex}main.center{justify-content:center;align-items:center;min-height:80vh}h2,h3{margin:0}.sub,.hint,.note,.attribution,.card-meta{color:var(--muted);margin:0}.row{justify-content:space-between;align-items:center;gap:12px;display:flex}button{background:var(--brand);color:#fff;cursor:pointer;border:none;border-radius:8px;padding:10px 16px;font-size:1rem}button:disabled{opacity:.5;cursor:default}button.secondary{background:var(--surface);color:var(--text);border:1px solid var(--border)}button.danger{color:var(--low);border:1px solid var(--low);background:0 0}button.rec{background:var(--accent)}select{background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:8px;padding:8px;font-size:1rem}audio{width:100%}.topbar{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;gap:12px;padding:12px 16px;display:flex}.brand{color:var(--brand);font-weight:700}.topbar nav{gap:16px;display:flex}.topbar nav a{color:var(--muted);text-decoration:none}.topbar nav a.active{color:var(--text);font-weight:600}footer.site{border-top:1px solid var(--border);justify-content:space-between;align-items:center;max-width:680px;margin:24px auto 0;padding:16px;display:flex}.next-card{background:var(--brand-soft);border:1px solid 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8px;text-decoration:none;display:grid}.unit:hover{background:var(--bg)}.unit.next{border-color:var(--brand);background:var(--bg)}.status{color:var(--muted);text-align:center;font-size:1.1rem;line-height:1.4}.unit.done .status{color:var(--good)}.unit.started .status{color:var(--ok)}.unit-body{flex-direction:column;display:flex}.unit-title{font-weight:600}.unit-sub,.unit-goal,.unit-progress{color:var(--muted);font-size:.9rem}details.intro{border:1px solid var(--border);border-radius:12px;padding:12px 16px}details.intro>summary{cursor:pointer;font-weight:600}details.intro p{margin:8px 0}.label{color:var(--muted);margin:8px 0 4px;font-size:.9rem}.chips{flex-wrap:wrap;gap:6px;margin:0;padding:0;list-style:none;display:flex}.chips li{background:var(--brand-soft);border-radius:999px;padding:4px 10px}.chip-text{font-weight:600}.chip-vi{color:var(--muted);font-size:.9rem}.steps{color:var(--muted);margin:8px 0 0;padding-left:1.2rem}.pass{color:var(--good);margin:0;font-weight:600}.checklist{margin:4px 0 8px;padding-left:1.2rem}.checklist.result{padding-left:0;list-style:none}.checklist.result li.done{color:var(--good)}.checklist.result li.missing{color:var(--low)}.checklist small{color:var(--muted)}.task-result{border:1px solid var(--border);background:var(--surface);border-radius:12px;padding:12px 16px}.roleplay{flex-wrap:wrap;align-items:center;gap:8px 12px;display:flex}.roleplay .hint{flex-basis:100%}.review-badge{color:var(--accent);border:1px solid var(--accent);border-radius:999px;margin-left:8px;padding:0 8px;font-size:.8rem}.review-list{border:1px solid var(--accent);border-radius:12px;margin:0;padding:12px 16px}.review-list ul{margin:4px 0 0;padding-left:1.2rem}.unit-progress{white-space:nowrap;flex-direction:column;align-items:flex-end;display:flex}.back{text-decoration:none}.toolbar{flex-wrap:wrap;align-items:center;gap:8px 14px;display:flex}.segmented{border:1px solid var(--border);border-radius:8px;display:inline-flex;overflow:hidden}.segmented button{background:var(--surface);color:var(--text);border-radius:0;padding:8px 12px}.segmented button.on{background:var(--brand);color:#fff}.lines{flex-direction:column;gap:4px;margin:0;padding:0;list-style:none;display:flex}.lines button.line{text-align:left;width:100%;color:var(--text);background:0 0;border:1px solid #0000;grid-template-columns:5.5rem 1fr auto;gap:2px 10px;padding:8px 10px;display:grid}.lines li.current button.line{background:var(--brand-soft);border-color:var(--brand)}.speaker{color:var(--muted);text-overflow:ellipsis;font-size:.9rem;overflow:hidden}.vi{color:var(--muted);grid-column:2/4;font-size:.9rem}.badge{border:1px solid;border-radius:999px;align-self:start;padding:0 8px;font-size:.85rem;font-weight:600}.panel{border:1px solid var(--border);background:var(--surface);border-radius:12px;flex-direction:column;gap:12px;padding:16px;display:flex}.now{margin:0;font-size:1.25rem;font-weight:600}.controls,.pager{flex-wrap:wrap;gap:10px;display:flex}.pager{justify-content:space-between}.attempt{flex-direction:column;gap:10px;display:flex}.scores{grid-template-columns:1fr 1fr;gap:10px;display:grid}.score{background:var(--bg);border:1px solid var(--border);border-radius:10px;flex-direction:column;padding:10px 12px;display:flex}.score span{color:var(--muted);font-size:.9rem}.score strong{font-size:1.8rem;line-height:1.2}.good{color:var(--good)}.ok{color:var(--ok)}.low{color:var(--low)}.words{flex-wrap:wrap;gap:6px;margin:0;font-size:1.15rem;display:flex}.word{border-radius:4px;padding:0 4px}.word.fine{color:var(--good)}.word.meh{color:var(--ok);-webkit-text-decoration:underline dotted;text-decoration:underline dotted}.word.bad{color:var(--low);-webkit-text-decoration:underline wavy;text-decoration:underline wavy}.word.omit{color:var(--muted);text-decoration:line-through}.pitch{margin:0}.pitch svg{background:var(--bg);border:1px solid var(--border);border-radius:8px;width:100%;height:auto}.pitch path{fill:none;stroke-width:2.5px;stroke-linecap:round;stroke-linejoin:round}.pitch path.ref{stroke:var(--brand)}.pitch path.you{stroke:var(--accent)}.pitch figcaption{color:var(--muted);align-items:center;gap:6px;font-size:.9rem;display:flex}.key{border-radius:2px;width:14px;height:3px;display:inline-block}.key.ref{background:var(--brand)}.key.you{background:var(--accent);margin-left:10px}.error{color:var(--low);margin:0}.prompt{font-size:1.3rem}@media (width<=480px){.lines button.line{grid-template-columns:1fr auto}.speaker,.vi{grid-column:1/3}}.word-card{align-items:stretch}.word-vi{margin:8px 0;font-size:1.25rem}.word-text{margin:0;font-size:1.6rem;font-weight:600}.word-example{margin:0}button.icon{padding:2px 8px}