:root{--bg: #f4f5f7;--surface: #ffffff;--text: #1a1d21;--muted: #6b7280;--border: #e3e6ea;--primary: #2563eb;--primary-text: #ffffff;--radius: 14px}@media(prefers-color-scheme:dark){:root{--bg: #14171c;--surface: #1e232b;--text: #e8eaed;--muted: #9aa3af;--border: #2c333d;--primary: #3b82f6}}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.5}.topbar{display:flex;align-items:center;gap:12px;padding:14px 16px;background:var(--primary);color:var(--primary-text);position:sticky;top:0;z-index:10}.topbar h1{font-size:1.15rem;margin:0;flex:1}.counter{font-variant-numeric:tabular-nums;opacity:.9}.zoom{display:flex;gap:6px}.zoom-btn{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid rgba(255,255,255,.5);background:transparent;color:var(--primary-text);border-radius:8px;padding:4px 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12px;border-radius:10px;font-size:.9rem;cursor:pointer}.tab-btn.active{background:var(--primary);color:var(--primary-text);border-color:var(--primary)}.lessons{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}.lesson-btn{width:100%;text-align:left;background:var(--bg);border:1px solid var(--border);color:var(--text);padding:12px 14px;border-radius:10px;font-size:1rem;cursor:pointer}.footer{margin-top:8px;text-align:center}.viewer{gap:12px}.s-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:14px 16px}.s-text{font-size:calc(1.55rem * var(--sentence-scale, 1));line-height:1.5;word-break:break-word}.word{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:none;background:transparent;color:inherit;font:inherit;cursor:pointer;padding:1px 3px;border-radius:6px}.word:hover{background:color-mix(in srgb,var(--primary) 14%,transparent)}.word.selected{background:var(--primary);color:var(--primary-text)}.s-buttons{display:flex;gap:7px;margin-top:12px}.s-btn{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid var(--border);background:var(--bg);color:var(--text);font-size:.95rem;line-height:1;padding:5px 9px;border-radius:8px;cursor:pointer}.s-btn:hover{border-color:var(--primary)}.s-extra{margin-top:12px;padding:10px 12px;background:var(--bg);border-radius:8px;font-size:1.05rem;word-break:break-word}.s-extra[data-kind=note]{border-left:3px solid var(--primary);color:var(--muted);font-size:.95rem}.lit{color:var(--muted)}.s-btn.listening{border-color:#b4443a;color:#b4443a;animation:mic-pulse 1.2s ease-in-out infinite}@keyframes mic-pulse{50%{opacity:.35}}.stt-hit{color:#2e8b57;font-weight:600}.stt-miss{color:#b4443a;text-decoration:underline dotted}.stt-heard{margin-top:6px;color:var(--muted);font-size:.9rem}.stt-score{margin-top:4px;font-size:.95rem}@media(prefers-color-scheme:dark){.stt-hit{color:#3aa06a}.stt-miss,.s-btn.listening{color:#c9564b;border-color:#c9564b}}.practice-cta{align-self:center}.flashcard{text-align:center;min-height:170px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px}.face{display:flex;flex-direction:column;align-items:center;gap:12px;width:100%}.flash-target{font-size:3.2rem;line-height:1.2;word-break:break-word}.flash-base{font-size:1.6rem}.flash-status{min-height:1em}.flashcard .note{margin-top:4px;padding:10px 12px;background:var(--bg);border-left:3px solid var(--primary);border-radius:8px;color:var(--muted);font-size:.95rem;text-align:left}.prac-nav{display:flex;gap:12px}.prac-nav .btn{flex:1}.due-badge{display:inline-block;background:var(--primary);color:var(--primary-text);font-size:.75rem;font-weight:600;padding:1px 8px;border-radius:999px;vertical-align:middle}.srs-nav{display:flex;gap:10px}.srs-nav .btn{flex:1}.srs-again{background:#b4443a}.srs-good{background:var(--primary)}.srs-easy{background:#2e8b57}@media(prefers-color-scheme:dark){.srs-again{background:#c9564b}.srs-easy{background:#3aa06a}}