:root{--bg:#f4f4f8;--fg:#14141b;--muted:#62626f;--accent:#4f46e5;--line:#e0e0e8}
@media (prefers-color-scheme:dark){:root{--bg:#0b0b10;--fg:#f3f3f8;--muted:#a0a0ae;--accent:#8f96ff;--line:#2a2a35}}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.6 -apple-system,system-ui,"Segoe UI",sans-serif}
main{max-width:640px;margin:0 auto;padding:48px 20px 80px}
h1{font-size:30px;letter-spacing:-.4px;margin:0 0 4px}
h2{font-size:19px;margin:36px 0 6px}
p,li{color:var(--fg)}
.muted{color:var(--muted)}
a{color:var(--accent)}
nav{margin-top:40px;padding-top:16px;border-top:1px solid var(--line)}