:root { color-scheme: light dark; }
body { margin: 0; font: 17px/1.6 system-ui, sans-serif; }
main { max-width: 40rem; margin: 4rem auto; padding: 0 1.25rem; }
h1 { font-size: 1.8rem; margin-bottom: 0.5rem; }
h2 { font-size: 1.15rem; margin-top: 2rem; }