body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f4f4f4;
  color: #333;
}
header {
  text-align: center;
  background: #4CAF50;
  color: white;
  padding: 2em 1em;
}
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  padding: 2rem;
}
.card {
  background: white;
  padding: 1.5rem;
  text-align: center;
  text-decoration: none;
  color: #333;
  border-radius: 10px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  transition: 0.3s;
}
.card:hover {
  box-shadow: 0 4px 10px rgba(0,0,0,0.2);
  transform: translateY(-5px);
}
footer {
  text-align: center;
  padding: 1em;
  background: #eee;
}