:root{--bg-dark: #1e1f22;--bg-darker: #1a1b1e;--bg-chat: #2b2d31;--bg-input: #383a40;--bg-hover: #35373c;--bg-active: #404249;--text-primary: #f2f3f5;--text-secondary: #b5bac1;--text-muted: #949ba4;--accent: #5865f2;--accent-hover: #4752c4;--border: #3f4147}*{box-sizing:border-box}.video-viewer-v2{display:flex;flex-direction:column;height:100vh;background-color:var(--bg-dark);color:var(--text-primary);overflow:hidden;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif}.v2-header{display:flex;align-items:center;height:48px;padding:0 16px;background-color:var(--bg-dark);border-bottom:1px solid var(--border);flex-shrink:0;font-size:14px;color:var(--text-muted)}.back-btn{background:none;border:none;color:var(--text-muted);cursor:pointer;padding:4px 8px;border-radius:4px;display:flex;align-items:center;transition:color .2s}.back-btn:hover{color:var(--text-primary)}.v2-header-separator{width:1px;height:16px;background-color:var(--border);margin:0 12px}.v2-header-title{flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-weight:400;color:var(--text-secondary)}.v2-content{display:flex;flex:1;overflow:hidden}.panel-left{width:384px;display:flex;flex-direction:column;border-right:1px solid var(--border);background-color:var(--bg-dark)}.player-wrapper{width:100%;aspect-ratio:16 / 9;background:var(--bg-darker);overflow:hidden;position:relative}.player-wrapper iframe{position:absolute;top:0;left:0;width:100%;height:100%}.panel-header{padding:12px 16px;font-size:13px;font-weight:600;color:var(--text-muted);border-bottom:1px solid var(--border)}.subtitles-container{flex:1;overflow-y:auto;padding:4px 0}.subtitle-item{display:flex;padding:12px 16px;cursor:pointer;border-left:2px solid transparent;transition:background-color .2s;gap:12px}.subtitle-item:hover{background-color:var(--bg-hover)}.subtitle-item.active{background-color:#5865f21a;border-left-color:var(--accent)}.subtitle-item.highlighted{background-color:#5865f20d;box-shadow:inset 2px 0 0 var(--accent)}.sub-num{width:20px;text-align:right;font-size:12px;color:var(--text-muted);flex-shrink:0;margin-top:2px}.sub-content{flex:1}.sub-time{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;font-size:10px;color:var(--text-muted);margin-bottom:4px}.sub-text{font-size:13px;line-height:1.5;color:var(--text-secondary)}.subtitle-item.active .sub-text{color:var(--text-primary)}.panel-center{flex:1;overflow-y:auto;padding:16px 24px;display:flex;flex-direction:column;gap:24px;background-color:var(--bg-dark)}.v2-section{display:flex;flex-direction:column;gap:12px}.v2-section-title{font-size:16px;font-weight:600;color:var(--text-primary)}.v2-card{background-color:var(--bg-darker);border:1px solid var(--border);border-radius:12px;padding:16px}.v2-card.accent{border-left:4px solid var(--accent)}.ts-pill{background-color:var(--bg-chat);color:var(--accent);border:1px solid var(--border);border-radius:6px;padding:2px 8px;font-size:11px;font-family:ui-monospace,monospace;cursor:pointer;transition:all .2s;font-weight:600}.ts-pill:hover{background-color:var(--bg-hover);border-color:var(--accent)}.sentence-badge{background-color:var(--bg-input);color:var(--text-muted);border:1px solid var(--border);border-radius:4px;padding:0 4px;font-size:10px;cursor:pointer;margin-left:6px;transition:all .2s;vertical-align:middle}.sentence-badge:hover{background-color:var(--bg-active);color:var(--text-primary)}.sentence-badge.highlighted{background-color:var(--accent);color:#fff;border-color:var(--accent)}.summary-json-content{display:flex;flex-direction:column;gap:24px}.key-questions-grid{display:grid;grid-template-columns:1fr;gap:12px}.key-q-card{border-left:4px solid var(--accent)!important}.key-q-header{display:flex;align-items:flex-start;gap:8px;margin-bottom:8px}.key-q-emoji{font-size:18px;flex-shrink:0}.key-q-text{font-weight:600;font-size:15px;color:var(--text-primary);line-height:1.4}.key-q-answer{font-size:14px;color:var(--text-secondary);line-height:1.6}.key-q-bullets{margin-top:8px;padding-left:18px;list-style-type:disc}.key-q-bullets li{margin-bottom:4px}.summary-intro{font-style:italic;border-left:2px solid var(--border);padding-left:16px;color:var(--text-secondary);line-height:1.6}.toc-list,.toc-sublist{list-style:none;padding:0;margin:0}.toc-list>li{margin-bottom:8px}.toc-sublist{margin-top:4px;padding-left:24px}.toc-item{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:4px 0}.toc-label{font-size:14px;font-weight:500;color:var(--text-primary)}.toc-sublabel{font-size:13px;color:var(--text-muted)}.summary-section{border-top:1px solid var(--border);padding-top:24px}.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.section-title{font-size:18px;font-weight:700;color:var(--text-primary)}.section-intro{font-size:14px;font-style:italic;color:var(--text-muted);line-height:1.6;margin-top:-8px}.subsection{margin-bottom:20px}.subsection-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}.subsection-title{font-size:15px;font-weight:600;color:var(--text-secondary)}.summary-bullets{list-style:none;padding:0}.summary-bullets li{position:relative;padding-left:16px;margin-bottom:8px;font-size:14px;color:var(--text-secondary);line-height:1.6}.summary-bullets li:before{content:"–";position:absolute;left:0;color:var(--text-muted)}.tags-wrap{display:flex;flex-wrap:wrap;gap:8px}.tag-pill{background-color:var(--bg-chat);color:var(--text-muted);padding:4px 10px;border-radius:9999px;font-size:12px;border:1px solid var(--border)}.summary-text{font-size:14px;line-height:1.6;color:var(--text-secondary)}.chapters-list{display:flex;flex-direction:column;gap:8px}.chapter-item{display:flex;align-items:center;gap:12px;padding:8px 12px;border-radius:8px;cursor:pointer;background-color:var(--bg-darker);border:1px solid var(--border);transition:border-color .2s}.chapter-item:hover{border-color:var(--accent)}.chapter-time{background-color:var(--bg-chat);color:var(--text-primary);padding:2px 8px;border-radius:9999px;font-size:11px;font-family:ui-monospace,monospace}.chapter-label{font-size:13px;color:var(--text-secondary)}.keywords-wrap{display:flex;flex-wrap:wrap;gap:8px}.keyword-pill{background-color:var(--bg-chat);color:var(--text-secondary);padding:4px 12px;border-radius:9999px;font-size:12px}.panel-right{width:288px;display:flex;flex-direction:column;border-left:1px solid var(--border);background-color:var(--bg-dark)}.chat-header{height:40px;padding:0 12px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border)}.chat-header-title{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted)}.btn-reset{background:none;border:none;color:var(--text-muted);font-size:11px;cursor:pointer}.btn-reset:hover{color:var(--text-primary)}.chat-messages{flex:1;overflow-y:auto;padding:12px;display:flex;flex-direction:column}.quick-questions-section{padding:12px;border-bottom:1px solid var(--border);flex-shrink:0}.quick-questions{display:flex;flex-direction:column;gap:8px}.quick-q-btn{text-align:left;background-color:var(--bg-darker);border:1px solid var(--border);color:var(--text-secondary);padding:8px 12px;border-radius:8px;font-size:12px;cursor:pointer;transition:all .2s}.quick-q-btn:hover{border-color:var(--accent);color:var(--text-primary)}.empty-chat-hint{flex:1;display:flex;align-items:center;justify-content:center;text-align:center;color:var(--text-muted);font-size:13px;padding:40px 20px}.message{padding:10px 12px;border-radius:12px;font-size:13px;line-height:1.5;max-width:90%;word-wrap:break-word;margin-bottom:12px}.message.user{align-self:flex-end;background-color:var(--accent);color:var(--text-primary);border-bottom-right-radius:4px}.message.assistant{align-self:flex-start;background-color:var(--bg-chat);color:var(--text-primary);border-bottom-left-radius:4px}.chat-input-area{padding:12px;border-top:1px solid var(--border)}.input-wrapper{display:flex;align-items:center;background-color:var(--bg-input);border-radius:8px;padding:4px 8px}.chat-input{flex:1;background:transparent;border:none;color:var(--text-primary);padding:8px;font-size:13px;outline:none}.chat-input::placeholder{color:var(--text-muted)}.send-btn{background:none;border:none;color:var(--accent);font-size:13px;font-weight:600;cursor:pointer;padding:4px 8px}.send-btn:disabled{color:var(--text-muted);cursor:not-allowed}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}*{margin:0;padding:0;box-sizing:border-box}:root{--bg: #0f0f0f;--surface: #1a1a2e;--surface-2: #16213e;--accent: #e94560;--accent-hover: #ff6b81;--text: #eee;--text-dim: #999;--border: #333;--success: #4ecdc4;--warning: #feca57;--error: #ff6b6b}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-hover)}button{cursor:pointer;border:none;border-radius:8px;padding:10px 20px;font-size:14px;transition:all .2s}input,textarea{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:12px 16px;color:var(--text);font-size:15px;outline:none;transition:border-color .2s}input:focus,textarea:focus{border-color:var(--accent)}.container{max-width:1200px;margin:0 auto;padding:0 20px}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#444;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#666}