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.timeline-segment-handle,.timeline-segment.selected .timeline-segment-handle{opacity:1}.timeline-segment-handle--left{left:0;border-radius:4px 0 0 4px;background:linear-gradient(90deg,rgba(255,255,255,.3) 0%,transparent 100%)}.timeline-segment-handle--right{right:0;border-radius:0 4px 4px 0;background:linear-gradient(-90deg,rgba(255,255,255,.3) 0%,transparent 100%)}.timeline-segment-handle:hover{background:#fff6}.timeline-playhead{position:absolute;top:0;width:2px;pointer-events:none;z-index:100}.timeline-playhead-head{position:absolute;top:-8px;left:-5px;width:0;height:0;border-left:6px solid transparent;border-right:6px solid transparent;border-top:8px solid var(--color-playhead)}.timeline-playhead-line{position:absolute;top:0;left:0;width:2px;height:100%;background:var(--color-playhead);box-shadow:0 0 4px #3b82f680}.timeline-controls{display:flex;align-items:center;gap:16px;padding:8px 12px;background:var(--color-timeline-surface);border-top:1px solid 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#f0f0f0;--color-surface-hover: #e5e5e5;--color-text: #333;--color-text-secondary: #666;--color-text-muted: #888;--color-text-inverse: #fff;--color-border: #e0e0e0;--color-border-strong: #333;--color-accent: #4285f4;--color-accent-hover: #5a95f5;--color-accent-ring: rgba(66, 133, 244, .2);--color-caption: #D4A84B;--color-caption-bg: rgba(255, 243, 176, .3);--color-caption-badge: #fff3b0;--color-caption-badge-text: #7c5c00;--color-ad: rgba(147, 112, 219, 1);--color-ad-bg: rgba(147, 112, 219, .08);--color-ad-bg-hover: rgba(147, 112, 219, .12);--color-ad-bg-active: rgba(147, 112, 219, .18);--color-ad-border: rgba(147, 112, 219, .4);--color-ad-border-active: rgba(147, 112, 219, .7);--color-ad-badge-bg: rgba(147, 112, 219, .15);--color-ad-badge-text: #6b4c9a;--color-ad-badge-hover-bg: rgba(147, 112, 219, .25);--color-ad-badge-hover-text: #5a3d8a;--color-ad-badge-active-bg: rgba(147, 112, 219, .35);--color-ad-badge-active-text: #4a2c7a;--color-timeline-bg: #1a1a1a;--color-timeline-surface: #222;--color-timeline-ruler: #252525;--color-timeline-border: #333;--color-timeline-tick: #444;--color-timeline-tick-major: #555;--color-timeline-label: #888;--color-timeline-btn-bg: #333;--color-timeline-btn-border: #444;--color-timeline-btn-text: #ccc;--color-playhead: #3B82F6;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .1);--shadow-md: 0 4px 20px rgba(0, 0, 0, .15);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .2);--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;--font-serif: "Georgia", "Times New Roman", serif;--font-mono: "SF Mono", Monaco, Consolas, monospace;--scrollbar-track: #f1f1f1;--scrollbar-thumb: #ccc;--scrollbar-thumb-hover: #aaa;--color-segment-hover: rgba(0, 0, 0, .03);--color-timestamp-bg: #f0f0f0;--color-timestamp-text: #888;--color-timestamp-hover-bg: #e0e0e0;--color-timestamp-hover-text: #555;--color-input-bg: var(--color-surface);--color-input-border: #ddd;--color-input-text: var(--color-text)}@media(prefers-color-scheme:dark){:root{--color-bg: #121212;--color-surface: #1e1e1e;--color-surface-alt: #333;--color-surface-hover: #444;--color-text: #e0e0e0;--color-text-secondary: #999;--color-text-muted: #888;--color-text-inverse: #fff;--color-border: #333;--color-border-strong: #444;--color-caption-bg: rgba(255, 213, 79, .15);--color-caption-badge: #4a4000;--color-caption-badge-text: #ffd54f;--color-ad-bg: rgb(153 103 255 / 40%);--color-ad-bg-hover: rgb(153 103 255 / 55%);--color-ad-bg-active: rgba(147, 112, 219, .2);--color-ad-border: rgba(147, 112, 219, .5);--color-ad-border-active: rgba(147, 112, 219, .7);--color-ad-badge-bg: rgba(147, 112, 219, .2);--color-ad-badge-text: #b39ddb;--color-ad-badge-hover-bg: rgba(147, 112, 219, .3);--color-ad-badge-hover-text: #d1c4e9;--color-ad-badge-active-bg: rgba(147, 112, 219, .4);--color-ad-badge-active-text: #ede7f6;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .3);--shadow-md: 0 4px 20px rgba(0, 0, 0, .3);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .4);--scrollbar-track: #2d2d2d;--scrollbar-thumb: #555;--scrollbar-thumb-hover: #666;--color-segment-hover: rgba(255, 255, 255, .05);--color-timestamp-bg: #2d2d2d;--color-timestamp-text: #aaa;--color-timestamp-hover-bg: #3d3d3d;--color-timestamp-hover-text: #ccc;--color-input-bg: #2d2d2d;--color-input-border: #444;--color-input-text: #fff}}*{box-sizing:border-box}body{margin:0;padding:0;font-family:var(--font-sans);background:var(--color-bg);color:var(--color-text)}.app{display:flex;flex-direction:column;height:100vh;overflow:hidden}.app-header{display:flex;align-items:center;justify-content:space-between;padding:12px 24px;background:var(--color-surface);border-bottom:1px solid var(--color-border);flex-shrink:0}.app-title{margin:0;font-size:20px;font-weight:600;color:var(--color-text)}.header-actions{display:flex;align-items:center;gap:12px}.app-main{display:flex;flex-direction:column;flex:1;overflow:hidden}.app-panels{display:flex;flex:1;overflow:hidden;padding:16px;gap:16px}.document-panel{flex:1;min-width:0;display:flex;flex-direction:column}.player-panel{width:400px;flex-shrink:0;display:flex;flex-direction:column;gap:12px}.timeline-panel{flex-shrink:0;height:180px;border-top:1px solid var(--color-timeline-border)}.segment-info{background:var(--color-surface);border-radius:8px;padding:12px 16px;display:flex;align-items:center;justify-content:space-between;box-shadow:var(--shadow-sm)}.info-label{font-size:13px;color:var(--color-text-secondary)}.info-value{font-size:18px;font-weight:600;color:var(--color-text)}.dialog-overlay{position:fixed;inset:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000}.dialog{background:var(--color-surface);border-radius:12px;padding:24px;width:320px;box-shadow:var(--shadow-lg)}.dialog h3{margin:0 0 16px;font-size:18px;font-weight:600}.dialog input[type=text]{width:100%;padding:10px 12px;font-size:16px;border:1px solid var(--color-input-border);border-radius:6px;margin-bottom:16px;background:var(--color-input-bg);color:var(--color-input-text)}.dialog input[type=text]:focus{outline:none;border-color:var(--color-accent);box-shadow:0 0 0 3px var(--color-accent-ring)}.dialog-actions{display:flex;justify-content:flex-end;gap:8px}.dialog-actions button{padding:8px 16px;font-size:14px;border:none;border-radius:6px;cursor:pointer;transition:background .15s}.dialog-actions button[type=button]{background:var(--color-surface-alt);color:var(--color-text-secondary)}.dialog-actions button[type=button]:hover{background:var(--color-surface-hover)}.dialog-actions button[type=submit]{background:var(--color-accent);color:var(--color-text-inverse)}.dialog-actions button[type=submit]:hover{background:var(--color-accent-hover)}@media(max-width:900px){.app-panels{flex-direction:column}.player-panel{width:100%;max-height:40vh}.timeline-panel{height:150px}}