:root { color-scheme: light dark; font-family: system-ui, sans-serif; }
body { margin: 0; }
main { max-width: 42rem; margin: 4rem auto; padding: 0 1.25rem; line-height: 1.6; }
h1, h2 { line-height: 1.2; }
nav { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 1.5rem; }