/* base */
body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #f4f4f9;
}

header {
  padding: 2rem;
  text-align: center;
  background: #B02B2B;
  color: white;
  font-size: 2rem;
  letter-spacing: 1px;
}

/* grid layout for desktop/tablet */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.card {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 150px;
  color: white;
  text-decoration: none;
  font-size: 1.5rem;
  font-weight: bold;
  border-radius: 16px;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 6px 15px rgba(0,0,0,0.1);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

/* Mobile adjustments: force single column */
@media (max-width: 600px) {
  .grid {
    display: flex !important;
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
  }

  .card {
    width: 100%;
  }
}