body {
  font-family: system-ui, -apple-system, sans-serif;
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem;
  line-height: 1.6;
  color: #222;
}

header {
  margin-bottom: 3rem;
}

header h1 a {
  text-decoration: none;
  color: inherit;
}

nav a {
  margin-right: 1rem;
  text-decoration: none;
  color: #0066cc;
}

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

main {
  margin-bottom: 3rem;
}

footer {
  border-top: 1px solid #ddd;
  padding-top: 1rem;
  font-size: 0.9rem;
  color: #666;
}