.site-footer {
    margin-top: 0;
    padding: 1rem 0 1rem;
    border-top: 1px solid #000;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    text-align: center;
    background-color: #ffffff !important;
    position: relative;
    z-index: 10;
  }
  /* スマホオーバースクロール対策: 下端に白い覆いを追加（画面外に配置） */
  .site-footer::after {
    content: "";
    position: absolute;
    bottom: -50px;
    left: 0;
    right: 0;
    height: 50px;
    background: #ffffff;
    z-index: 10;
  }
  .site-footer__icons {
    display: flex;
    gap: 1.5rem;
  }
  .site-footer__icon {
    width: 52px;
    height: 52px;
    border: 1px solid #000;
    border-radius: 9999px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s ease;
  }
  .site-footer__icon:hover {
    background-color: #000;
  }
  .site-footer__icon img {
    width: 22px;
    height: 22px;
    object-fit: contain;
    transition: filter 0.3s ease;
  }
  .site-footer__icon:hover img {
    filter: invert(1);
  }
  .site-footer__copy {
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    color: #000;
  }