:root { color-scheme: light dark; }
body { max-width: 44rem; margin: 0 auto; padding: 2.5rem 1.25rem 4rem;
       font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
h1 { font-size: 1.6rem; margin-bottom: .25rem; }
h2 { font-size: 1.1rem; margin-top: 2rem; }
.sub { color: #666; margin-top: 0; }
ul, ol { padding-left: 1.2rem; }
a { color: #0b57d0; }
footer { margin-top: 3rem; padding-top: 1rem; border-top: 1px solid #ddd; color: #666; font-size: .9rem; }
@media (prefers-color-scheme: dark) { .sub, footer { color: #999; } footer { border-color: #333; } a { color: #7cacf8; } }