:root{--font-sans:"Inter", system-ui, -apple-system, sans-serif;--font-mono:"Share Tech Mono", monospace;--bg-base:#0b0f19;--bg-surface:#141b2d;--bg-surface-hover:#1e283d;--bg-surface-glass:#141b2db3;--border-color:#ffffff14;--border-color-hover:#ffffff29;--color-primary:#00f0ff;--color-primary-glow:#00f0ff59;--color-secondary:#ffea00;--color-accent:#f05;--color-success:#10b981;--color-warning:#f59e0b;--color-danger:#ef4444;--text-primary:#f3f4f6;--text-secondary:#9ca3af;--text-muted:#6b7280;--shadow-lg:0 10px 25px -5px #0000004d, 0 8px 10px -6px #0000004d;--shadow-glow:0 0 15px 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var(--color-primary-glow);background-color:#00f0ff14}.file-upload-box.has-file{border-style:solid;border-color:var(--color-success);background-color:#10b9810a}.upload-icon{color:var(--text-secondary)}.file-upload-box:hover .upload-icon{color:var(--color-primary)}.file-upload-box.has-file .upload-icon{color:var(--color-success)}.file-label{word-break:break-all;font-size:.8rem;font-weight:500}.file-hint{color:var(--text-muted);font-size:.7rem}.session-list{flex-direction:column;gap:.5rem;max-height:180px;padding-right:2px;display:flex;overflow-y:auto}.session-item{border:1px solid var(--border-color);cursor:pointer;background-color:#ffffff08;border-radius:6px;padding:.5rem .75rem;font-size:.75rem;transition:all 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var(--border-color);box-shadow:var(--shadow-lg);border-radius:12px;flex-direction:column;justify-content:space-between;gap:1rem;width:100%;height:100%;padding:1rem;display:flex;overflow:hidden}.canvas-container{cursor:crosshair;touch-action:none;background-color:#000;border:1px solid #ffffff0d;border-radius:8px;flex:1;justify-content:center;align-items:center;width:100%;display:flex;position:relative;overflow:hidden}.editor-canvas{max-width:100%;max-height:100%;display:block;box-shadow:0 10px 30px #00000080}.hidden-video{opacity:0;pointer-events:none;width:1px;height:1px;position:absolute}.canvas-placeholder-text{text-align:center;color:var(--text-secondary);pointer-events:none;z-index:2;flex-direction:column;align-items:center;gap:.75rem;width:80%;display:flex;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.canvas-placeholder-text h3{color:#fff;font-size:1.1rem}.canvas-placeholder-text 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