:root {
  color-scheme: light dark;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --link: #0066cc;
  --bg: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --link: #4da3ff;
    --bg: #000000;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 48px 20px 64px;
}

h1 { font-size: 2em; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 1.25em; margin: 2em 0 0.5em; }
a { color: var(--link); }
.muted { color: var(--muted); }

nav {
  margin-top: 48px;
  padding-top: 16px;
  border-top: 1px solid color-mix(in srgb, var(--muted) 30%, transparent);
  font-size: 0.9em;
}
nav a { margin-right: 16px; }