:root { color-scheme: light dark; }
body {
  margin: 0 auto;
  max-width: 42rem;
  padding: 1.5rem 1.25rem 4rem;
  font: 1.0625rem/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
header { margin-bottom: 2.5rem; }
header a { font-weight: 600; color: inherit; text-decoration: none; }
h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 1rem; }
h2 { font-size: 1.25rem; margin: 2rem 0 0.5rem; }
.muted { opacity: 0.7; }
li { margin-bottom: 0.5rem; }