body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f5f5f5;
  color: #333;
  font-size: 20px;
}

header {
  background: #003366;
  color: #fff;
  padding: 10px 20px;
}

header h1 {
  margin: 0;
  font-size: 1.8em;
}

nav ul {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: flex;
  gap: 20px;
}

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

nav a:hover,
nav a.active {
  text-decoration: underline;
}

main {
  padding: 20px;
  background: #fff;
  margin: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

footer {
  text-align: center;
  padding: 10px;
  background: #003366;
  color: #fff;
  margin-top: 20px;
}