:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #595959;
  --link: #0b5fff;
  --border: #e2e2e2;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111111;
    --fg: #f0f0f0;
    --muted: #a8a8a8;
    --link: #6ea8ff;
    --border: #2a2a2a;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}

h1 {
  font-size: 1.75rem;
  margin-bottom: 0.25rem;
}

h2 {
  font-size: 1.15rem;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
}

p {
  color: var(--muted);
}

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

nav {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
}

footer {
  margin-top: 3rem;
  font-size: 0.8rem;
  color: var(--muted);
}