body { font: 16px/1.6 system-ui, sans-serif; max-width: 42rem; margin: 2rem auto; padding: 0 1rem; color: #1a1a1a; background: #fff; }
h1, h2 { line-height: 1.25; }
nav { margin-bottom: 2rem; }
nav a { margin-right: 1rem; }
a { color: #0b57d0; }
footer { margin-top: 3rem; font-size: .875rem; color: #555; }
@media (prefers-color-scheme: dark) {
  body { color: #e6e6e6; background: #141414; }
  a { color: #8ab4f8; }
  footer { color: #aaa; }
}