:root{--bg:#fafafa;--surface:#fff;--border:#e4e4e7;--text:#18181b;--muted:#52525b;--faint:#71717a;--accent:#1d4ed8;--accent-hover:#1e40af}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{background:var(--bg);color:var(--text);margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,PingFang SC,Microsoft YaHei,sans-serif;font-size:16px;line-height:1.6}.wrap{max-width:960px;margin:0 auto;padding:0 20px}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.site-header{background:var(--surface);border-bottom:1px solid var(--border)}.site-header .wrap{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;min-height:56px;padding-top:8px;padding-bottom:8px;display:flex}.brand{letter-spacing:-.01em;color:var(--text);font-size:18px;font-weight:700}.brand:hover{text-decoration:none}.nav{flex-wrap:wrap;align-items:center;gap:18px;display:flex}.nav a{color:var(--muted);font-size:14px}.nav 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