:root { color-scheme: light dark; }
body { font: 16px/1.6 system-ui, sans-serif; max-width: 40rem; margin: 3rem auto; padding: 0 1rem; }
h1 { font-size: 1.5rem; }
h2 { font-size: 1.1rem; margin-top: 2rem; }
nav, footer { font-size: .9rem; }
footer { margin-top: 3rem; opacity: .7; }