:root { color-scheme: light dark; }
* { box-sizing: border-box; }
body {
  margin: 0 auto; padding: 3rem 1.25rem; max-width: 40rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.7; font-size: 17px; color: #1a1a1a; background: #fafaf7;
}
h1 { font-size: 1.6rem; margin: 0 0 0.25rem; }
.tagline { color: #666; margin-top: 0; }
a { color: #0b5fa5; text-decoration: none; }
a:hover { text-decoration: underline; }
footer { margin-top: 3rem; color: #888; font-size: 0.9rem; border-top: 1px solid #e2e2dd; padding-top: 1rem; }
@media (prefers-color-scheme: dark) {
  body { color: #ddd; background: #141414; }
  a { color: #7ab8ff; }
  .tagline, footer { color: #999; }
  footer { border-color: #333; }
}