body {
  font-family: 'Segoe UI', sans-serif;
  background: #f5f6fa;
  margin: 0;
  padding: 0;
  color: #333;
}
header {
  background-color: #003366;
  color: #fff;
  padding: 20px;
  text-align: center;
}
header h1 {
  margin: 0;
  font-size: 2rem;
}
nav a {
  color: #ffd700;
  margin: 0 10px;
  text-decoration: none;
  font-weight: bold;
}
main.content {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 20px;
  line-height: 1.7;
}
h2, h3 {
  color: #003366;
}
footer {
  text-align: center;
  font-size: 0.9em;
  background-color: #eee;
  padding: 20px;
  color: #333;
}