body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

header {
  background: #0066cc;
  color: white;
  text-align: center;
  padding: 40px 15px;
}

nav {
  display: flex;
  justify-content: center;
  gap: 20px;
  background: #e9e9e9;
  padding: 10px;
}

nav a {
  text-decoration: none;
  font-weight: bold;
  color: #333;
}

section {
  padding: 40px 20px;
  max-width: 900px;
  margin: auto;
}

.card {
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 20px;
  margin: 15px 0;
  background: #fafafa;
}

button {
  background: #0066cc;
  color: white;
  border: none;
  padding: 10px 18px;
  border-radius: 6px;
  cursor: pointer;
}

button:hover {
  background: #004999;
}

footer {
  text-align: center;
  padding: 20px;
  background: #eee;
}