.button-group-wrapper {
    width: 80%;
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 32px;
  }

  .button-group {
    display: grid;
    grid-template-columns: repeat(2, 1fr); /* スマホ: 2列 */
    gap: 12px;
  }

  @media (min-width: 768px) {
    .button-group {
      grid-template-columns: repeat(4, 1fr); /* タブレット以上: 4列 */
    }
  }

  .button-link {
    display: block;
    padding: 20px 14px; /* 縦のpadding増やし */
    background: #ABD5FF;
    color: white;
    text-align: center;
    border-radius: 8px;
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    transition: background-color 0.2s, transform 0.1s;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
  }

  .button-link:hover {
    background-color: #357ab8;
    transform: translateY(-1px);
  }

  .button-link:active {
    transform: translateY(1px);
  }