:root { color-scheme: light dark; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; margin: 0 auto; max-width: 48rem; padding: 1.5rem; line-height: 1.5; }
header, footer { margin-bottom: 1.5rem; }
nav a { margin-right: 1rem; }
a { text-decoration: none; }
a:hover { text-decoration: underline; }