/* 垂直排列＋分隔線，保留品牌色 */
.fd-social-login-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
  }
  .fd-social-login-buttons .fd-btn {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 0.75rem 1rem;
    color: #fff;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 500;
    /* 確保預設背景不覆蓋品牌色 */
    background-color: transparent;
  }
  .fd-social-login-buttons .fd-btn:not(:last-child)::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 1px;
    background: rgba(255,255,255,0.3);
  }
  .fd-social-login-buttons .fd-btn__icon {
    margin-right: 0.5rem;
    width: 1.2em;
    height: 1.2em;
    filter: brightness(0) invert(1);
  }
  
  /* 保留並強制應用品牌色 */
  .fd-social-login-buttons .fd-btn--line {
    background-color: #00C300 !important;
  }