:root { color-scheme: light dark; font-family: system-ui, sans-serif; line-height: 1.6; }
body { max-width: 42rem; margin: 2rem auto; padding: 0 1rem; }
h1 { font-size: 1.75rem; }
h2 { font-size: 1.125rem; margin-top: 1.5rem; }
ol, ul { padding-left: 1.25rem; }
a { color: #2e7d32; }
nav { margin-bottom: 1.5rem; }