:root{--bg: #fafafa;--bg-surface: #fff;--bg-hover: #f5f5f5;--bg-active: #e3f2fd;--bg-code: #f5f5f5;--bg-pre: #2d2d2d;--bg-card: #fff;--bg-highlighted: #fff8e1;--bg-atom-active: #fff3e0;--bg-role-user: #e3f2fd;--bg-role-assistant: #f3e5f5;--bg-role-tool: #dcedc8;--text: #222;--text-secondary: #666;--text-muted: #888;--text-pre: #f8f8f2;--border: #e0e0e0;--border-light: #ddd;--color-user: #1976d2;--color-assistant: #7b1fa2;--color-tool: #558b2f;--color-atom: #e65100;--color-tab-active: #1976d2;--atom-highlight-bg: rgba(255, 167, 38, .3);--atom-highlight-hover: rgba(255, 167, 38, .4);--overlay: rgba(0, 0, 0, .3)}@media (prefers-color-scheme: dark){:root{--bg: #1a1a1a;--bg-surface: #242424;--bg-hover: #333;--bg-active: #1a3a5c;--bg-code: #333;--bg-pre: #1e1e1e;--bg-card: #2a2a2a;--bg-highlighted: #3e2723;--bg-atom-active: #3e2723;--bg-role-user: #1a3a5c;--bg-role-assistant: #3a1a4a;--bg-role-tool: #2a3a1a;--text: #e0e0e0;--text-secondary: #aaa;--text-muted: #777;--text-pre: #f8f8f2;--border: #333;--border-light: #444;--color-user: #64b5f6;--color-assistant: #ce93d8;--color-tool: #aed581;--color-atom: #ff9800;--color-tab-active: #64b5f6;--atom-highlight-bg: rgba(255, 167, 38, .2);--atom-highlight-hover: rgba(255, 167, 38, .35);--overlay: rgba(0, 0, 0, .5)}}*{box-sizing:border-box;margin:0;padding:0}body{font-family:system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);height:100vh;overflow:hidden}.layout{display:grid;grid-template-columns:260px 1fr;height:100vh;overflow-x:hidden}.sidebar{background:var(--bg-surface);border-right:1px solid var(--border);display:flex;flex-direction:column;overflow:hidden}.sidebar-header{padding:1.5rem 1rem 1rem;border-bottom:1px solid var(--border)}.sidebar-header h1{font-size:1.25rem;font-weight:600;margin-bottom:.25rem}.sidebar-header .corpus-label{font-size:.75rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em}.sidebar-tabs{display:flex;border-bottom:1px solid 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