:root{--bg:#fff;--fg:#1c1c1e;--muted:#5c5c66;--line:#e4e4e8;--accent:#2a6f4e}
@media (prefers-color-scheme:dark){:root{--bg:#141416;--fg:#ececf0;--muted:#a0a0aa;--line:#2c2c32;--accent:#6cc39a}}
*{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}
main{max-width:44rem;margin:0 auto;padding:3rem 16px 4rem}
h1{font-size:1.75rem;line-height:1.25;margin:0 0 .25rem}
h2{font-size:1.1rem;margin:2rem 0 .5rem}
.sub{color:var(--muted);margin:0 0 2rem}
a{color:var(--accent)}
nav{border-top:1px solid var(--line);margin-top:3rem;padding-top:1rem;font-size:.9rem;color:var(--muted)}
nav a{margin-right:1rem}