:root { color-scheme: light dark; }
body { font: 16px/1.6 system-ui, sans-serif; max-width: 42rem; margin: 3rem auto; padding: 0 1rem; }
header h1 { font-size: 1.5rem; margin-bottom: .25rem; }
main { margin-top: 1.5rem; }
footer { margin-top: 3rem; font-size: .85rem; opacity: .7; }
a { color: #0a6; }