:root {
  color-scheme: light dark;
  --fg: #1a1a1a;
  --bg: #ffffff;
  --muted: #666;
  --accent: #2b5aa0;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #eaeaea;
    --bg: #121212;
    --muted: #999;
    --accent: #7aa9e6;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 2rem 1.25rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.6;
}

header, main, nav, footer {
  max-width: 640px;
  margin: 0 auto;
}

header {
  margin-bottom: 1.5rem;
}

h1 {
  margin-bottom: 0.25rem;
}

.tagline {
  color: var(--muted);
  margin-top: 0;
}

main {
  margin-bottom: 2.5rem;
}

nav {
  display: flex;
  gap: 1.25rem;
  padding: 1rem 0;
  border-top: 1px solid color-mix(in srgb, var(--fg) 15%, transparent);
}

nav a {
  color: var(--accent);
  text-decoration: none;
}

nav a:hover {
  text-decoration: underline;
}

footer {
  color: var(--muted);
  font-size: 0.85rem;
}

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