:root{--bg:#ffffff;--surface:#f7f7f8;--text:#16181d;--muted:#5b616e;--border:#e4e6eb;--radius:14px;--max:1120px;--prose:720px;--font:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:17px;line-height:1.65}img{max-width:100%;height:auto}a{color:var(--brand)}a:hover{text-decoration:underline}.container{max-width:var(--max);margin:0 auto;padding:0 20px}.skip-link{position:absolute;left:-9999px}.skip-link:focus{left:12px;top:12px;background:var(--bg);padding:8px 12px;z-index:10}.site-header{border-bottom:1px solid var(--border);background:var(--bg);position:-webkit-sticky;position:sticky;top:0;z-index:5}.site-header .container{justify-content:space-between;gap:16px;min-height:68px}.brand,.site-header 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