:root { color-scheme: light dark; }
body {
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  max-width: 42rem;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}
h1 { font-size: 2rem; margin-bottom: 0.25rem; }
h2 { margin-top: 2rem; }
a { color: #0a6cff; }
.muted { opacity: 0.7; }