body {
  font-family: 'Segoe UI', sans-serif;
  margin: 0;
  background: #f6f8fa;
  color: #222;
  line-height: 1.6;
}

header {
  background: #003366;
  color: white;
  text-align: center;
  padding: 1rem 0;
}

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

nav ul {
  list-style: none;
  padding: 0;
  display: flex;
  justify-content: center;
  background: #004080;
}

nav ul li {
  margin: 0 10px;
}

nav ul li a {
  color: white;
  text-decoration: none;
  padding: 10px;
}

nav ul li a:hover {
  background: #0059b3;
  border-radius: 5px;
}

main {
  padding: 20px;
  max-width: 900px;
  margin: 0 auto;
}

h2 {
  color: #004080;
  border-bottom: 2px solid #004080;
  padding-bottom: 5px;
}

article {
  background: white;
  padding: 15px;
  margin-bottom: 15px;
  border-left: 5px solid #004080;
  box-shadow: 0 0 5px rgba(0,0,0,0.1);
}

footer {
  text-align: center;
  background: #003366;
  color: white;
  padding: 1rem;
  margin-top: 30px;
}