.subject-grid .subject-button {
  padding: 20px;
  border-radius: 10px;
  background: #007BFF; /* primary blue */
  color: white;
  font-weight: bold;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  opacity: 0;
  transform: translateY(20px);
  display: flex;
  align-items: center;
  justify-content: center;
  height: 80px; /* consistent height */
  width: 180px; /* consistent width */
  text-decoration: none;
}

.subject-grid .subject-button.visible {
  opacity: 1;
  transform: translateY(0);
}

.subject-grid .subject-button:hover {
  background: #0056b3;
  transform: scale(1.05);
}