body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f7f9fc;
  color: #111;
}
header {
  background: #003d79;
  color: white;
  padding: 2rem;
  text-align: center;
}
main {
  max-width: 900px;
  margin: 2rem auto;
  padding: 0 1rem;
}
section {
  margin-bottom: 1.5rem;
}
footer {
  text-align: center;
  padding: 1rem 0;
  border-top: 1px solid #ddd;
  color: #555;
}