:root{font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Noto Sans JP",sans-serif;color:#14232e;background:#f3f5f6;font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,input,textarea{font:inherit}button{cursor:pointer;border:1px solid #ccd5dc;background:#fff;color:#253c4c;border-radius:8px;padding:10px 14px;font-size:14px;font-weight:650}button:hover{background:#edf2f5}button:disabled{opacity:.45;cursor:wait}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #679abd;outline-offset:3px}header{min-height:78px;padding:20px 5vw;background:#fff;border-bottom:1px solid #dce2e6;display:flex;align-items:center;justify-content:space-between;gap:16px}.brand{text-decoration:none;color:#14232e;font-size:18px;font-weight:800}.brand span{font-weight:500;margin-left:10px;font-size:14px}.badge{font-size:12px;padding:7px 12px;background:#e6edf1;border-radius:30px;white-space:nowrap}main{max-width:1510px;margin:0 auto;padding:36px 4vw}.eyebrow{letter-spacing:.16em;color:#667c8b;font-weight:800;font-size:12px;margin:0 0 10px}h1{font-size:clamp(24px,3vw,36px);letter-spacing:.02em;margin:0 0 12px}#courseMeta{color:#637581;margin:0 0 30px}.layout{display:grid;grid-template-columns:255px minmax(0,1fr);gap:28px}aside{align-self:start;position:sticky;top:24px}details{background:white;border:1px solid #dbe2e6;border-radius:12px;overflow:hidden}summary{padding:16px;font-size:14px;font-weight:750;cursor:pointer}#reviewProgress{font-size:12px;color:#677e8b;margin-left:8px}#lessons{display:grid;gap:2px;padding:4px 8px 8px}.lesson{border:0;background:none;text-align:left;width:100%;display:grid;grid-template-columns:24px 1fr;gap:8px;padding:13px 10px;border-radius:7px;line-height:1.55}.lesson[aria-current=true]{background:#e6eef3;color:#17394f}.lesson .num{color:#7b8d98;font-size:12px;padding-top:2px}.lesson strong{display:block;font-size:13px}.lesson small{font-size:11px;color:#6d7f8a}.lesson.done .num{color:#277064}.quiet{color:#73808a;font-size:12px;line-height:1.8}.content{min-width:0}.playerHeader{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:14px}h2{font-size:20px;line-height:1.6;margin:0}.switch{display:flex;flex-shrink:0;border:1px solid #cbd6dd;border-radius:9px;padding:3px;gap:2px;background:#fff}.switch button{border:0;padding:8px 12px;font-size:12px}.switch button[aria-pressed=true]{background:#253e4e;color:#fff}.player{background:#101216;position:relative;border-radius:10px;overflow:hidden;box-shadow:0 8px 30px #12232e0d}video{width:100%;height:100%;display:block;background:#101216}#loading{position:absolute;inset:0;display:flex;gap:18px;align-items:center;justify-content:center;flex-direction:column;background:#14232eea;color:white;padding:24px;text-align:center;font-size:14px}#loading[hidden]{display:none}progress{width:min(280px,75%);height:5px;accent-color:#9bb6c7}.actions{display:flex;gap:8px;flex-wrap:wrap;margin:15px 0 0}.primary{background:#253e4e;color:white;border-color:#253e4e}.primary:hover{background:#38576a}.status{min-height:18px;font-size:12px;color:#627787;margin:8px 0 12px}.reviewRow{display:flex;align-items:center;justify-content:space-between;gap:15px;border-top:1px solid #d9e1e5;padding:16px 0 24px;font-size:13px}.reviewRow label{display:flex;gap:8px;align-items:center}input[type=checkbox]{width:17px;height:17px;accent-color:#284c62}.lower{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:20px}.notePanel,.chapterPanel{border:1px solid #dbe2e6;border-radius:12px;background:#fff;padding:22px}h3{font-size:16px;margin:0 0 12px}.field{display:block;font-size:12px;font-weight:650;margin:12px 0}.field input,.field textarea{width:100%;margin-top:7px;border:1px solid #cdd7dd;border-radius:7px;padding:10px 12px;font-size:13px;line-height:1.7;color:#203846;background:#fff}.field textarea{resize:vertical}.noteTime{display:flex;gap:12px;align-items:center;margin:18px 0 8px}.noteTime span{font-variant-numeric:tabular-nums;background:#eef3f6;padding:7px 12px;border-radius:6px;font-size:14px;font-weight:700}.noteTime button{border:0;padding:5px;background:none;font-size:11px}.noteTools{display:flex;gap:7px;flex-wrap:wrap;margin-top:16px}.noteTools button{font-size:11px;padding:8px 10px}.note{padding:12px 0;border-bottom:1px solid #e2e8ec}.note p{font-size:13px;line-height:1.8;white-space:pre-wrap;overflow-wrap:anywhere;margin:6px 0}.note button{padding:3px 7px;font-size:11px}.note .delete{float:right;border:0;color:#8a5656}.scene{display:flex;width:100%;gap:12px;text-align:left;border:0;border-radius:5px;padding:9px 5px;font-size:12px;font-weight:500;line-height:1.6}.scene time{font-variant-numeric:tabular-nums;min-width:40px;color:#718998}.scene[aria-current=true]{background:#eaf1f5;color:#1c425a}.chapterPanel{max-height:650px;overflow:auto}footer{text-align:center;padding:20px 20px 36px;font-size:11px;color:#83919a}@media(max-width:1000px){.layout{grid-template-columns:215px minmax(0,1fr);gap:18px}.lower{grid-template-columns:1fr}.playerHeader{flex-wrap:wrap}.chapterPanel{max-height:400px}}@media(max-width:720px){header{padding:17px 20px;min-height:64px}.brand{font-size:15px}.brand span{display:block;margin:4px 0 0;font-size:11px}.badge{font-size:10px}main{padding:26px 16px}.layout{display:block}aside{position:static;margin-bottom:20px}aside>.quiet{display:none}.playerHeader{gap:8px}h2{font-size:17px}.actions button{font-size:11px;padding:9px 10px}.lower{gap:14px}.notePanel,.chapterPanel{padding:18px}.reviewRow{font-size:12px}.reviewRow button{font-size:11px}.lesson strong{font-size:13px}}

.videoSurface{position:relative;aspect-ratio:16/9}#playback{display:flex;align-items:center;gap:10px;padding:10px 12px;background:#14232e;color:white}#playback[hidden]{display:none}#playback button,#playback select{background:#294353;color:white;border:1px solid #5a7180;border-radius:6px;padding:7px 9px;font-size:12px;white-space:nowrap}#playTime{font-size:11px;font-variant-numeric:tabular-nums;white-space:nowrap}#seekbar{min-width:45px;flex:1;accent-color:#a7c4d6}#player:fullscreen{width:100%;height:100%;border-radius:0;display:flex;flex-direction:column;background:#101216}#player:fullscreen .videoSurface{flex:1;min-height:0;aspect-ratio:auto}#player:fullscreen video{object-fit:contain}#player:fullscreen #playback{flex-shrink:0}@media(max-width:720px){#playback{flex-wrap:wrap;gap:7px;padding:8px}#playTime{font-size:10px}#seekbar{flex-basis:45%}#playback button,#playback select{font-size:10px;padding:6px 7px}}