:root {
  --bg: #ffffff;
  --text: #222222;
  --muted: #666666;
  --link: #1a5fb4;
  --line: #dddddd;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #181818;
    --text: #e6e6e6;
    --muted: #999999;
    --link: #78aeed;
    --line: #333333;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0 auto;
  padding: 2rem 1rem;
  max-width: 40rem;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
}

header {
  border-bottom: 1px solid var(--line);
  margin-bottom: 1.5rem;
}

h1 {
  margin: 0;
  font-size: 2rem;
}

header p {
  margin: 0.25rem 0 1rem;
  color: var(--muted);
}

h2 {
  font-size: 1.2rem;
  margin: 1.5rem 0 0.5rem;
}

h3 {
  font-size: 1rem;
  margin: 1.2rem 0 0.3rem;
}

a {
  color: var(--link);
}

ul {
  padding-left: 1.2rem;
}

footer {
  border-top: 1px solid var(--line);
  margin-top: 2rem;
  padding-top: 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}