body {
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  margin: 0;
  background: #f5f7fa;
}

header {
  background: #003366;
  color: white;
  padding: 1.5rem;
}

nav ul {
  list-style: none;
  padding: 0;
  background: #e1e5ea;
}

nav li {
  padding: 0.8rem;
  border-bottom: 1px solid #ccc;
}

nav a {
  text-decoration: none;
  font-weight: bold;
  color: #003366;
}

main {
  padding: 1.5rem;
}

footer {
  text-align: center;
  font-size: 0.8rem;
  color: #666;
  padding: 1rem;
}