.letter-card {
      cursor: pointer;
      transition: transform 0.2s ease;
      min-height: 150px;
    }
.letter-card:hover {
      transform: scale(1.05);
      box-shadow: 0 0 15px rgba(0,0,0,0.1);
    }
.pronunciation {
      font-weight: bold;
      font-size: 1.1rem;
      color: #333;
    }