:root{--bg: #0e0f12;--surface: #16181d;--surface-2: #1e2128;--line: #282c35;--text: #e8eaed;--muted: #8b919e;--accent: #7aa2f7;--done: #6fcf97;--danger: #f07178;--radius: 14px;--safe-top: env(safe-area-inset-top, 0px);--safe-bottom: env(safe-area-inset-bottom, 0px)}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.5 -apple-system,BlinkMacSystemFont,SF Pro Text,Segoe UI,system-ui,sans-serif;-webkit-font-smoothing:antialiased;overscroll-behavior-y:none}a{color:inherit;text-decoration:none}button{font:inherit;color:inherit;cursor:pointer}.shell{max-width:1100px;margin:0 auto;padding:calc(var(--safe-top) + 20px) 20px calc(var(--safe-bottom) + 48px)}.topbar{display:flex;align-items:center;gap:14px;margin-bottom:26px;min-height:40px}.topbar h1{font-size:21px;font-weight:600;letter-spacing:-.01em;margin:0;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.back{background:none;border:none;padding:8px 12px 8px 0;color:var(--muted);font-size:15px;flex-shrink:0}.back:hover{color:var(--text)}.ghost{background:none;border:1px solid var(--line);border-radius:9px;padding:7px 13px;font-size:14px;color:var(--muted);white-space:nowrap}.ghost:hover{color:var(--text);border-color:var(--muted)}.ghost.danger:hover{color:var(--danger);border-color:var(--danger)}.muted{color:var(--muted)}.empty{color:var(--muted);padding:48px 0;text-align:center}.addbox{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px;margin-bottom:28px}.addbox textarea{width:100%;min-height:46px;max-height:220px;resize:vertical;background:transparent;border:none;outline:none;color:var(--text);font:inherit;padding:4px 2px}.addbox textarea::placeholder{color:var(--muted)}.addbox .row{display:flex;align-items:center;gap:12px;margin-top:10px}.primary{background:var(--accent);color:#0e0f12;border:none;border-radius:9px;padding:9px 18px;font-size:14px;font-weight:600}.primary:disabled{opacity:.45;cursor:default}.hint{color:var(--muted);font-size:13px}.notice{margin-top:12px;padding:10px 12px;border-radius:10px;background:var(--surface-2);font-size:14px;line-height:1.45}.notice.error{color:var(--danger)}.notice ul{margin:6px 0 0;padding-left:18px}.section-title{font-size:13px;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);margin:0 0 12px}.courses{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:12px}.course-card{display:block;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px;transition:border-color .15s,transform .15s}.course-card:hover{border-color:var(--muted)}.course-card:active{transform:scale(.99)}.course-card h3{margin:0 0 8px;font-size:16px;font-weight:600;line-height:1.35}.course-meta{font-size:13px;color:var(--muted)}.bar{height:4px;background:var(--surface-2);border-radius:2px;margin-top:12px;overflow:hidden}.bar>span{display:block;height:100%;background:var(--done);border-radius:2px;transition:width .3s}.videos{display:flex;flex-direction:column;gap:2px}.video-row{display:flex;align-items:center;gap:14px;padding:10px;border-radius:11px;transition:background .12s}.video-row:hover{background:var(--surface)}.video-row.current{background:var(--surface-2)}.thumb{position:relative;width:132px;aspect-ratio:16 / 9;border-radius:8px;background:var(--surface-2) center/cover no-repeat;flex-shrink:0}.thumb .len{position:absolute;right:4px;bottom:4px;background:#000000d1;border-radius:4px;padding:1px 5px;font-size:11px;font-variant-numeric:tabular-nums}.thumb .resume{position:absolute;left:0;bottom:0;height:3px;background:var(--accent);border-bottom-left-radius:8px}.video-main{flex:1;min-width:0}.video-main .title{font-size:15px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.video-main .sub{font-size:13px;color:var(--muted);margin-top:3px;display:flex;align-items:center;gap:8px;flex-wrap:wrap}.tag{font-size:11px;border:1px solid var(--line);border-radius:5px;padding:1px 6px;color:var(--muted)}.tag.warn{color:#e0af68;border-color:#e0af68}.check{flex-shrink:0;width:24px;text-align:center;color:var(--done);font-size:15px}.rowbtn{background:none;border:none;color:var(--muted);padding:6px 8px;font-size:15px;opacity:0;flex-shrink:0}.video-row:hover .rowbtn{opacity:1}.rowbtn:hover{color:var(--danger)}.player-page{max-width:1400px;margin:0 auto;padding:0 0 calc(var(--safe-bottom) + 40px)}.stage{background:#000}.stage-inner{max-width:1400px;margin:0 auto;aspect-ratio:16 / 9;max-height:78vh}.stage-inner iframe{width:100%;height:100%;border:0;display:block}.under{padding:20px;max-width:1400px;margin:0 auto}.player-layout{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:28px;align-items:start}@media(max-width:900px){.hint{display:none}.player-layout{grid-template-columns:1fr;gap:22px}.thumb{width:104px}.shell{padding-left:14px;padding-right:14px}.under{padding:16px 14px}}.player-title{font-size:19px;font-weight:600;line-height:1.35;margin:0 0 6px}.player-sub{color:var(--muted);font-size:14px;display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:18px}.controls{display:flex;gap:10px;flex-wrap:wrap;align-items:center;padding:14px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-bottom:20px}.toggle{display:inline-flex;align-items:center;gap:8px;font-size:14px;color:var(--muted);-webkit-user-select:none;user-select:none;cursor:pointer}.toggle input{accent-color:var(--accent);width:16px;height:16px}.toggle:hover{color:var(--text)}.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px}.up-next{max-height:62vh;overflow-y:auto}.up-next .video-row{padding:8px}.up-next .thumb{width:92px}.up-next .video-main .title{font-size:13.5px}.note-input{display:flex;gap:8px;margin-bottom:14px}.note-input input{flex:1;min-width:0;background:var(--surface-2);border:1px solid var(--line);border-radius:9px;padding:9px 11px;color:var(--text);font:inherit;outline:none}.note-input input:focus{border-color:var(--accent)}.note{display:flex;gap:10px;padding:9px 0;border-top:1px solid var(--line);font-size:14px;line-height:1.5}.note:first-of-type{border-top:none}.stamp{color:var(--accent);font-variant-numeric:tabular-nums;background:none;border:none;padding:2px 0 0;flex-shrink:0;font-size:13px}.note-body{flex:1;min-width:0;overflow-wrap:anywhere}.comment{display:flex;gap:11px;padding:13px 0;border-top:1px solid var(--line)}.comment img{width:32px;height:32px;border-radius:50%;flex-shrink:0}.comment .who{font-size:13px;color:var(--muted);margin-bottom:3px}.comment .what{font-size:14px;line-height:1.55;white-space:pre-wrap;overflow-wrap:anywhere}.login{min-height:100dvh;display:grid;place-items:center;padding:20px}.login form{width:100%;max-width:320px;display:flex;flex-direction:column;gap:12px}.login h1{font-size:20px;font-weight:600;margin:0 0 4px;text-align:center}.login input{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:12px 14px;color:var(--text);font:inherit;outline:none}.login input:focus{border-color:var(--accent)}.desc{font-size:14px;line-height:1.65;white-space:pre-wrap;overflow-wrap:anywhere;color:#c9ced8}.desc.clamped{display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden}.dlink{color:var(--accent);overflow-wrap:anywhere}.dlink:hover{text-decoration:underline}.materials{display:flex;flex-direction:column;gap:2px}.material{display:flex;align-items:baseline;gap:10px;padding:7px 8px;border-radius:8px;font-size:14px;line-height:1.45;transition:background .12s}.material:hover{background:var(--surface-2)}.material-label{color:var(--accent);flex:1;min-width:0;overflow-wrap:anywhere}.material-host{color:var(--muted);font-size:12px;flex-shrink:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:42%}.chapters{display:flex;flex-direction:column;gap:1px}.chapter{display:flex;gap:11px;align-items:baseline;text-align:left;background:none;border:none;padding:7px 8px;border-radius:8px;font-size:14px;line-height:1.45}.chapter:hover{background:var(--surface-2)}.chapter .stamp{min-width:52px}