:root{--bg:#fff;--fg:#18181b;--muted:#71717a;--border:#e4e4e7;--card:#fafafa;--brand:#4f46e5;--brand-fg:#fff;--accent:#f59e0b;--success:#10b981;--danger:#ef4444;--code-bg:#f4f4f5}@media (prefers-color-scheme:dark){:root{--bg:#0a0a0a;--fg:#fafafa;--muted:#a1a1aa;--border:#27272a;--card:#111113;--code-bg:#18181b}}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:15px;line-height:1.6;-webkit-font-smoothing:antialiased}a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}header.site{position:-webkit-sticky;position:sticky;top:0;z-index:50;background:hsla(0,0%,100%,.85);backdrop-filter:saturate(180%) blur(12px);-webkit-backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--border)}@media (prefers-color-scheme:dark){header.site{background:hsla(0,0%,4%,.85)}}header.site nav{max-width:1100px;margin:0 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