:root{--bg:#f7f8fa;--fg:#1a1d21;--muted:#6b7280;--card:#fff;--border:#e5e7eb;--accent:#2563eb;--accent-fg:#fff;--ok:#16a34a;--code-bg:#f3f4f6;--radius:10px;--maxw:1080px}@media (prefers-color-scheme:dark){:root{--bg:#0f1115;--fg:#e8eaed;--muted:#9aa0a6;--card:#171a20;--border:#262b33;--accent:#4f8cff;--accent-fg:#0b0d10;--ok:#34d399;--code-bg:#1d2129}}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{background:var(--bg);color:var(--fg);margin:0;font:15px/1.65 system-ui,-apple-system,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3{margin:0 0 .5em;line-height:1.3}p{margin:0 0 1em}.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}.site-header{z-index:10;background:color-mix(in srgb, var(--bg) 88%, transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--border);position:sticky;top:0}.site-header 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