:root{--font-sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;--font-mono:"JetBrains Mono","Fira Code","Cascadia Code",Consolas,monospace;--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--shadow-sm:0 1px 3px #0000001f;--shadow-md:0 4px 12px #00000026;--shadow-lg:0 8px 30px #0003;--transition:0.2s ease;--sidebar-width:240px;--header-height:64px}:root,[data-theme=dark]{--bg:#0f0f23;--bg-secondary:#131330;--surface:#1a1a2e;--surface-hover:#224;--surface-active:#2a2a4a;--border:#2d2d50;--border-light:#3a3a5c;--primary:#6c63ff;--primary-hover:#5a52e0;--primary-light:#6c63ff26;--accent:#00d2d3;--accent-light:#00d2d326;--danger:#ff4757;--danger-hover:#e03e4e;--danger-light:#ff47571f;--success:#2ed573;--warning:#ffa502;--text:#e2e8f0;--text-secondary:#94a3b8;--text-muted:#64748b;--skeleton:#2a2a4a;--overlay:#0009;--scrollbar-track:#1a1a2e;--scrollbar-thumb:#3a3a5c}[data-theme=light]{--bg:#f5f7fa;--bg-secondary:#eef1f6;--surface:#fff;--surface-hover:#f0f2f5;--surface-active:#e4e7ec;--border:#d1d5db;--border-light:#e5e7eb;--primary:#6c63ff;--primary-hover:#5a52e0;--primary-light:#6c63ff1a;--accent:#00b4b5;--accent-light:#00b4b51a;--danger:#ef4444;--danger-hover:#dc2626;--danger-light:#ef444414;--success:#22c55e;--warning:#f59e0b;--text:#1e293b;--text-secondary:#64748b;--text-muted:#94a3b8;--skeleton:#e2e8f0;--overlay:#0006;--scrollbar-track:#f0f0f0;--scrollbar-thumb:#c1c1c1}*,:after,:before{-webkit-tap-highlight-color:transparent!important;box-sizing:border-box;margin:0;padding:0}.surface-overlay,.video-container,.video-container 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