:root { color-scheme: light dark; }
body { margin:0; font:16px/1.6 system-ui,-apple-system,Segoe UI,sans-serif; }
main { max-width:42rem; margin:0 auto; padding:3rem 1.25rem; }
h1 { font-size:1.75rem; margin:0 0 .5rem; }
h2 { font-size:1.15rem; margin:2rem 0 .5rem; }
article { border-top:1px solid #8883; padding-top:.5rem; }
nav { margin-top:2.5rem; font-size:.9rem; }
a { color:#2563eb; }