html { color-scheme: light dark; }
body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 18px;
  line-height: 1.55;
  color: #1f2328;
  background: #fafafa;
}
main {
  max-width: 40rem;
  margin: 0 auto;
  padding: 4rem 1.5rem;
}
h1 { font-size: 1.9rem; line-height: 1.25; margin: 0 0 1.5rem; }
h2 { font-size: 1.2rem; margin: 2.5rem 0 0.5rem; }
p { margin: 0 0 1rem; }
a { color: #0b5cad; }
@media (prefers-color-scheme: dark) {
  body { color: #e6e6e6; background: #16181b; }
  a { color: #7ab7ff; }
}