:root {
  color-scheme: light dark;
  --text: #1a1a1a;
  --muted: #555;
  --bg: #fafafa;
  --card: #fff;
  --link: #0969da;
  --border: #e5e5e5;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #e8e8e8;
    --muted: #aaa;
    --bg: #111;
    --card: #1a1a1a;
    --link: #58a6ff;
    --border: #333;
  }
}

* {
  box-sizing: border-box;
}

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

main {
  max-width: 42rem;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

header {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

h1 {
  font-size: 1.75rem;
  line-height: 1.25;
  margin: 0 0 0.25rem;
}

.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

nav {
  margin-top: 1rem;
  font-size: 0.9rem;
}

nav a {
  margin-right: 1rem;
}

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

h2 {
  font-size: 1.15rem;
  margin: 2rem 0 0.75rem;
}

p,
ul {
  margin: 0 0 1rem;
}

ul {
  padding-left: 1.25rem;
}

li {
  margin-bottom: 0.35rem;
}

.meta {
  color: var(--muted);
  font-size: 0.9rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
}

footer {
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
}