:root{--rail:#1c1c1e;--rail-hover:#2a2a2d;--rail-fg:#f2f2f4;--rail-muted:#96969b;--bg:#f2f2f2;--surface:#fff;--surface-sunken:#fafafa;--fg:#1a1a1c;--muted:#6f6f76;--faint:#98989f;--line:#e6e6e9;--line-strong:#d3d3d8;--accent:#0f62c4;--accent-hover:#0b4c9c;--accent-soft:#e9f1fc;--info-bg:#eceef2;--info-fg:#4a5261;--info-panel:#eef2f8;--warn-bg:#fdf0e0;--warn-fg:#95591a;--danger-bg:#fdecec;--danger-fg:#a32b2b;--danger-line:#f0cfcf;--radius:10px;--radius-sm:6px;--pill:999px;--rail-w:260px;--actionbar-h:108px}*{box-sizing:border-box}html,body{background:var(--surface);color:var(--fg);-webkit-font-smoothing:antialiased;margin:0;padding:0;font:15px/1.5 ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif}a{color:var(--accent);text-underline-offset:2px}.shell{grid-template-columns:var(--rail-w) 1fr;min-height:100vh;display:grid}.rail{width:var(--rail-w);background:var(--rail);color:var(--rail-fg);z-index:20;flex-direction:column;display:flex;position:fixed;inset:0 auto 0 0}.rail 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