:root { color-scheme: light dark; --bg:#fff; --fg:#1d1d1f; --muted:#6e6e73; --accent:#0a84ff; --line:#d2d2d7; }
@media (prefers-color-scheme: dark) { :root { --bg:#000; --fg:#f5f5f7; --muted:#a1a1a6; --line:#3a3a3c; } }
* { box-sizing: border-box; }
body { margin:0; background:var(--bg); color:var(--fg); font:17px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif; }
main { max-width:720px; margin:0 auto; padding:48px 20px 80px; }
h1 { font-size:2.1rem; line-height:1.15; margin:0 0 .25em; }
h2 { font-size:1.25rem; margin:2em 0 .4em; }
p, li { color:var(--fg); }
.muted { color:var(--muted); font-size:.95rem; }
a { color:var(--accent); }
nav { margin:0 0 2em; padding-bottom:1em; border-bottom:1px solid var(--line); }
nav a { margin-right:1.2em; text-decoration:none; font-weight:600; }
ul { padding-left:1.2em; }