:root { color-scheme: light dark; }
body { font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif; margin: 2rem auto; max-width: 48rem; padding: 0 1rem; }
header h1 a { text-decoration: none; color: inherit; }
footer { margin-top: 3rem; color: #666; font-size: .9rem; }