body {
  font-family: Arial, sans-serif;
  background: #f0f8ff;
  color: #333;
  margin: 0;
  padding: 0;
}
header, footer {
  background: #004d40;
  color: #fff;
  text-align: center;
  padding: 20px;
}
.container {
  max-width: 800px;
  margin: auto;
  padding: 20px;
}
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 15px;
  margin-top: 20px;
}
.card {
  background: #fff;
  border: 1px solid #ccc;
  border-radius: 8px;
  padding: 15px;
  text-align: center;
  text-decoration: none;
  color: #004d40;
  font-weight: bold;
  transition: background 0.3s;
}
.card:hover {
  background: #e0f2f1;
}