:root{--bg:#fff;--fg:#1d2330;--muted:#5b6475;--line:#e3e6ec;--accent:#2557d6}
@media (prefers-color-scheme:dark){:root{--bg:#141821;--fg:#e8ebf2;--muted:#9aa3b5;--line:#2a3140;--accent:#7aa2ff}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.65 system-ui,-apple-system,Segoe UI,Roboto,sans-serif}
main{max-width:720px;margin:0 auto;padding:48px 16px 64px}
h1{font-size:1.9rem;margin:0 0 .25rem}h2{font-size:1.2rem;margin:2rem 0 .5rem}
p,li{color:var(--fg)}.muted{color:var(--muted);font-size:.9rem}
a{color:var(--accent)}nav{margin:1rem 0 2rem;padding-bottom:1rem;border-bottom:1px solid var(--line)}
nav a{margin-right:1rem}footer{margin-top:3rem;padding-top:1rem;border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}