:root{color-scheme:light dark;--bg:#fff;--fg:#1a1a1a;--mut:#555;--line:#ddd}
@media (prefers-color-scheme:dark){:root{--bg:#111;--fg:#eee;--mut:#aaa;--line:#333}}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,sans-serif}
main{max-width:42rem;margin:0 auto;padding:2rem 1rem 4rem}
h1{font-size:1.8rem}h2{font-size:1.2rem;margin-top:2rem}
a{color:inherit}nav a{margin-right:1rem}footer{margin-top:3rem;color:var(--mut);font-size:.9rem;border-top:1px solid var(--line);padding-top:1rem}