:root{--bg-dark: #0d1117;--bg-panel: #161b22;--bg-hover: #21262d;--border-color: #30363d;--text-primary: #c9d1d9;--text-secondary: #8b949e;--primary-color: #58a6ff;--danger-color: #f85149;--highlight-color: rgba(56, 139, 253, .4)}*{box-sizing:border-box}body{margin:0;padding:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Helvetica,Arial,sans-serif;background-color:var(--bg-dark);color:var(--text-primary);display:flex;flex-direction:column;height:100vh;overflow:hidden}input,select,textarea{background:#0d1117;color:var(--text-primary);border:1px solid var(--border-color);border-radius:4px;padding:4px 8px;font-family:inherit;font-size:13px}input:focus,select:focus,textarea:focus{border-color:var(--primary-color);outline:none}.btn{background:var(--bg-hover);color:var(--text-primary);border:1px solid var(--border-color);border-radius:4px;padding:4px 12px;cursor:pointer;font-size:13px;transition:all .2s}.btn:hover{background:#30363d;transform:scale(.98)}.btn-primary{background:#238636;border-color:#f0f6fc1a;color:#fff;box-shadow:0 2px 8px #2386364d}.btn-primary:hover{background:#2ea043;transform:scale(.98)}.btn-danger{background:#da3633;color:#fff;border:none}.btn-danger:hover{background:#f85149;transform:scale(.98)}.btn-sm{padding:2px 8px;font-size:12px}.header{height:48px;border-bottom:1px solid var(--border-color);display:flex;align-items:center;padding:0 16px;background-color:#161b22d9;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);flex-shrink:0;z-index:10;position:relative}.logo{display:flex;align-items:center;font-weight:700;text-decoration:none;color:inherit}.logo:hover{opacity:.9}.logo-img{height:28px;margin-right:12px}.logo-text{font-size:16px;margin-right:8px;flex-shrink:0}.logo-ver{font-size:11px;color:var(--text-secondary);background:#8b949e26;padding:2px 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var(--border-color);flex-shrink:0;position:relative}.list-panel{width:300px;display:flex;flex-direction:column;border-right:1px solid var(--border-color);flex-shrink:0}.detail-panel{flex:1;display:flex;flex-direction:column;min-width:0}.json-panel{width:360px;background:var(--bg-dark);display:flex;flex-direction:column;flex-shrink:0;transition:width .3s ease}.main.json-collapsed .json-panel{width:0;border-left:none;overflow:hidden}.json-toggle-btn{position:absolute;right:-12px;top:50%;transform:translateY(-50%);z-index:100;width:24px;height:32px;background:var(--bg-hover);border:1px solid var(--border-color);border-radius:4px;color:var(--text-primary);cursor:pointer;display:flex;align-items:center;justify-content:center;padding:0;transition:right .3s}.json-toggle-btn:hover{background:var(--border-color)}.main.json-collapsed .json-toggle-btn{right:0;border-radius:4px 0 0 4px;border-right:none}.video-container{flex:1;position:relative;background:#000;display:flex;align-items:center;justify-content:center;overflow:hidden}.video-title-overlay{position:absolute;left:16px;top:16px;z-index:8;color:#ffffffd9;font-size:13px;font-family:monospace;background:#00000080;padding:4px 10px;border-radius:4px;pointer-events:none;max-width:calc(100% - 32px);box-sizing:border-box;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}video{width:100%;height:100%;object-fit:contain}.chapter-overlay{position:absolute;pointer-events:none;overflow:hidden}.chapter-overlay-title{position:absolute;left:16px;bottom:32px;background:#0009;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);padding:8px 12px;border-radius:8px;color:#fff;display:flex;flex-direction:column;border-left:4px solid var(--primary-color);transition:all .2s;opacity:1}.chapter-overlay-title .title{font-size:18px;font-weight:700;margin-bottom:4px}.chapter-overlay-title .desc{font-size:13px;opacity:.8}.empty-state-overlay{position:absolute;top:0;right:0;bottom:0;left:0;background:#0d1117f2;display:flex;align-items:center;justify-content:center;z-index:10;transition:background .2s}.empty-state-overlay.drag-active{background:#0d1117cc}.empty-state-overlay.drag-active .drop-zone{border-color:var(--primary-color);background:#58a6ff0f;transform:scale(1.01)}.drop-zone{border:2px dashed var(--border-color);border-radius:16px;padding:48px 40px;text-align:center;transition:border-color .25s,background .25s,transform .2s;max-width:460px;width:80%;cursor:pointer}.drop-zone:hover{border-color:var(--text-secondary);background:#ffffff05}.drop-zone-icon{font-size:56px;margin-bottom:20px;filter:grayscale(.3);transition:filter .2s}.empty-state-overlay:hover .drop-zone-icon{filter:grayscale(0)}.drop-zone-title{font-size:17px;font-weight:600;color:var(--text-primary);margin-bottom:8px}.drop-zone-sub{font-size:13px;color:var(--text-secondary);margin-bottom:20px}.drop-zone-divider{position:relative;height:1px;background:var(--border-color);margin:0 40px 16px}.drop-zone-or{position:absolute;top:-9px;left:50%;transform:translate(-50%);background:#0d1117f2;padding:0 12px;font-size:12px;color:var(--text-secondary);text-transform:uppercase}.drop-zone-url-hint{font-size:12px;color:var(--text-secondary);opacity:.7}.hint-overlay{position:absolute;top:16px;right:16px;background:#0d1117d9;display:flex;flex-direction:row;align-items:center;justify-content:center;z-index:9;padding:10px 20px;text-align:center;border-radius:8px;border:1px solid var(--border-color);box-shadow:0 8px 16px #00000080;gap:10px;pointer-events:auto;transition:opacity .3s}.hint-icon{font-size:20px;margin-bottom:0;opacity:.8}.hint-text{font-size:14px;color:var(--text-secondary)}.list-panel-header{height:40px;border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between;padding:0 12px;background:var(--bg-panel);flex-shrink:0}.list-panel-actions{display:flex;gap:4px}.panel-body{flex:1;padding:0;overflow-y:auto;overflow-x:hidden;position:relative}.panel-header-toolbar{display:flex;gap:8px;padding:12px;border-bottom:1px solid var(--border-color);background:var(--bg-panel);position:sticky;top:0;z-index:5}.chapter-list{padding:12px;display:flex;flex-direction:column;gap:8px;animation:fadeSlideIn .2s ease}.chapter-card{display:flex;flex-direction:column;background:var(--bg-dark);border:1px solid var(--border-color);border-radius:6px;overflow:hidden;cursor:grab;transition:border-color .2s,transform .15s,box-shadow 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.chapter-card-actions{opacity:1}.card-btn{background:transparent;border:none;color:var(--text-secondary);cursor:pointer;padding:4px;border-radius:4px;display:inline-flex;align-items:center;justify-content:center}.card-btn .btn-icon{width:14px;height:14px}.card-btn:hover{background:var(--bg-hover);color:var(--text-primary)}.detail-view{padding:16px;animation:fadeSlideIn .2s ease}.detail-header{display:flex;align-items:center;gap:8px;margin-bottom:16px;padding-bottom:12px;border-bottom:1px solid var(--border-color)}.detail-header-btn{background:transparent;border:none;color:var(--text-primary);cursor:pointer;display:flex;align-items:center;gap:4px;font-weight:700}.detail-header-btn:hover{color:var(--primary-color)}.form-group{margin-bottom:16px}.form-group label{display:block;font-size:12px;color:var(--text-secondary);margin-bottom:6px;font-weight:500}.form-group .input-wrap{display:flex;gap:8px}.form-group input,.form-group textarea{width:100%}.form-group 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20px;color:var(--text-secondary)}.empty-state .icon{font-size:32px;margin-bottom:16px;opacity:.5}@keyframes fadeSlideIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.panel-body::-webkit-scrollbar{width:6px}.panel-body::-webkit-scrollbar-track{background:transparent}.panel-body::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:3px}.panel-body::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}#jsonContent::-webkit-scrollbar{width:6px}#jsonContent::-webkit-scrollbar-track{background:transparent}#jsonContent::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:3px}.timeline-strip::-webkit-scrollbar{height:6px}.timeline-strip::-webkit-scrollbar-track{background:var(--bg-dark)}.timeline-strip::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:3px}.timeline-strip::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}.json-panel-header{height:40px;border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between;padding:0 12px;background:var(--bg-panel);font-size:13px;font-weight:700;font-family:monospace}.json-textarea-wrap{position:relative;flex:1;display:flex;overflow:hidden}#jsonContent{width:100%;height:100%;border:none;background:transparent;color:#a5d6ff;font-family:ui-monospace,SFMono-Regular,SF Mono,Consolas,Liberation Mono,Menlo,monospace;font-size:12px;padding:12px;resize:none;line-height:1.4;outline:none}.btn-icon-copy{position:absolute;top:8px;right:16px;background:var(--bg-panel);border:1px solid var(--border-color);color:var(--text-secondary);width:26px;height:26px;border-radius:4px;display:flex;align-items:center;justify-content:center;cursor:pointer;opacity:0;transition:all .2s ease}.json-textarea-wrap:hover .btn-icon-copy{opacity:1}.btn-icon-copy:hover{color:var(--primary-color);background:var(--bg-hover);transform:scale(1.1)}.timeline-strip{height:106px;background:var(--bg-dark);border-top:1px 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rgba(0,0,0,.5);font-weight:500}.seg-handle{position:absolute;top:0;width:12px;height:100%;cursor:ew-resize;z-index:5}.seg-handle-left{left:-4px;border-radius:4px 0 0 4px}.seg-handle-right{right:-4px;border-radius:0 4px 4px 0}.seg-handle:after{content:"";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:2px;height:12px;border-radius:1px;background:#fff0;transition:all .15s}.timeline-chapter-segment:hover .seg-handle:after{background:#fff9}.timeline-chapter-segment.dragging .seg-handle:after{background:#ffffffe6}.seg-handle.focused{z-index:10}.seg-handle.focused:after{background:var(--primary-color)!important;box-shadow:0 0 8px var(--primary-color);width:4px;height:16px;border-radius:2px}.timeline-track-sep{position:absolute;left:0;right:0;height:1px;background:var(--border-color)}.timeline-rail{height:24px;position:absolute;left:16px;right:16px;top:44px;cursor:pointer}.timeline-total{position:absolute;left:0;right:0;top:10px;height:4px;background:#f0f6fc1a;border-radius:2px}.timeline-loaded{position:absolute;left:0;top:10px;height:4px;background:#f0f6fc33;border-radius:2px}.timeline-current{position:absolute;left:0;top:10px;height:4px;background:var(--primary-color);border-radius:2px}.timeline-thumb{position:absolute;top:6px;width:12px;height:12px;background:#fff;border-radius:50%;transform:translate(-50%);box-shadow:0 0 4px #00000080;pointer-events:none}.timeline-float{position:absolute;top:-20px;transform:translate(-50%);background:#fff;color:#000;font-size:11px;padding:2px 6px;border-radius:4px;pointer-events:none;display:none;z-index:20}.timeline-rail:hover 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16px;color:#fff}.preview-player-wrap{flex:1;min-height:0;display:flex;align-items:center;justify-content:center;padding:32px}.preview-player-wrap .video{width:100%;max-width:1280px;aspect-ratio:16/9;background:#000;border:1px solid #333;box-shadow:0 10px 30px #00000080}.app-toast{position:fixed;left:50%;bottom:80px;transform:translate(-50%) translateY(20px);background:var(--text-primary);color:var(--bg-dark);padding:8px 16px;border-radius:4px;font-size:14px;opacity:0;visibility:hidden;transition:all .3s cubic-bezier(.175,.885,.32,1.275);z-index:1000;box-shadow:0 4px 12px #0003}.app-toast.error{background:var(--danger-color);color:#fff}.app-toast.show{opacity:1;visibility:visible;transform:translate(-50%) translateY(0)}.draft-toast{position:fixed;right:16px;top:64px;background:var(--bg-panel);border:1px solid var(--border-color);border-left:4px solid var(--primary-color);padding:12px 16px;border-radius:4px;display:flex;align-items:center;gap:12px;box-shadow:0 4px 12px 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textarea{width:100%;resize:vertical;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:13px;line-height:1.5}.modal-footer{display:flex;gap:8px;justify-content:flex-end;padding:12px 20px;border-top:1px solid var(--border-color)}.waveform-canvas{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;pointer-events:none;z-index:0;border-radius:6px}.timeline-chapter-segment{z-index:1}.input-wrap{display:flex;gap:4px;align-items:center}.input-wrap input{flex:1}.btn-step{background:var(--bg-hover);color:var(--text-primary);border:1px solid var(--border-color);border-radius:4px;padding:0 6px;height:26px;cursor:pointer;font-size:10px;font-weight:700;transition:all 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