/* 仅手机端显示独立返回顶部按钮，桌面客服栏保持原样。 */
.mobile-back-top { display: none; }
@media (max-width: 768px) {
  .mobile-back-top:not([hidden]) {
    position: fixed;
    right: 14px;
    bottom: calc(24px + env(safe-area-inset-bottom, 0px));
    z-index: 900;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    width: 48px;
    height: 48px;
    padding: 0;
    border: 1px solid rgba(255, 255, 255, .7);
    border-radius: 50%;
    background: #009b50;
    color: #fff;
    box-shadow: 0 3px 14px rgba(0, 65, 34, .2);
    font-family: inherit;
    cursor: pointer;
  }
  .mobile-back-top span { font-size: 11px; line-height: 1; }
  .mobile-back-top:focus-visible { outline: 2px solid #173c2b; outline-offset: 3px; }
}