:root{--bg:#fff;--fg:#1b1f24;--muted:#5b6470;--accent:#1f5fbf;--line:#e3e7ec}
@media (prefers-color-scheme:dark){:root{--bg:#111418;--fg:#e8ebef;--muted:#9aa4b0;--accent:#6ea2ff;--line:#262c33}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,"Segoe UI",sans-serif}
header,main,footer{max-width:760px;margin:0 auto;padding:0 16px}
header{display:flex;justify-content:space-between;align-items:center;padding-top:24px;padding-bottom:24px;border-bottom:1px solid var(--line)}
.brand{font-weight:700;font-size:20px;color:var(--fg);text-decoration:none;letter-spacing:.3px}
nav a{color:var(--muted);text-decoration:none;margin-left:20px}nav a:hover,nav a[aria-current]{color:var(--fg)}
main{padding-top:40px;padding-bottom:40px}h1{font-size:32px;line-height:1.2;margin:0 0 16px}h2{font-size:20px;margin:32px 0 8px}
p{color:var(--muted)}a{color:var(--accent)}
footer{border-top:1px solid var(--line);padding-top:16px;padding-bottom:32px;color:var(--muted);font-size:14px}