body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f4f8ff;
  color: #1f2937;
  line-height: 1.6;
}

header {
  background: #ADD8E6;
  color: white;
  padding: 24px;
}

nav a {
  color: white;
  font-weight: bold;
  margin-right: 14px;
}

main {
  max-width: 900px;
  margin: auto;
  padding: 24px;
}

.card {
  background: white;
  border: 1px solid #d9e2ec;
  border-radius: 14px;
  padding: 18px;
  margin: 16px 0;
}

.button {
  display: inline-block;
  background: #2563eb;
  color: white;
  padding: 10px 14px;
  border-radius: 8px;
  text-decoration: none;
}

footer {
  background: #102a43;
  color: white;
  text-align: center;
  padding: 16px;
}