/* Mobile-only presentation; existing language selection and service state retained. */
@media (max-width: 640px) {
  .customer-shell .top-header {
    flex-wrap: nowrap;
    gap: 10px;
    min-height: 64px;
    height: 64px !important;
    padding: 0 16px;
  }
  .customer-shell .top-header .top-logo {
    flex-shrink: 0;
    gap: 8px;
    font-size: 15px;
    white-space: nowrap;
  }
  .customer-shell .top-header .brand-mark {
    width: 32px;
    height: 32px;
    border-radius: 11px;
    font-size: 18px;
    box-shadow: none;
  }
  .customer-shell .customer-header-tools {
    flex-wrap: nowrap;
    gap: 10px;
    margin-left: auto;
    flex-shrink: 0;
  }
  .customer-shell .customer-header-tools .top-status {
    order: -1;
    position: relative;
    flex-shrink: 0;
    padding: 0;
    width: 8px;
    height: 8px;
    border: 0;
    background: transparent;
  }
  .customer-shell .customer-header-tools .top-status > span:not(.status-dot) {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
  }
  .customer-shell .customer-header-tools .status-dot { width: 6px; height: 6px; }
  .customer-language-switch.customer-language-switch {
    padding: 3px;
    gap: 2px;
    border-radius: 11px;
    border-color: #e4eaf1;
    background: #f3f6fa;
  }
  .customer-language-switch.customer-language-switch button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 34px;
    padding: 0;
    font-size: 0;
    line-height: 1;
    border-radius: 8px;
    -webkit-tap-highlight-color: transparent;
  }
  .customer-language-switch.customer-language-switch button::after {
    font-size: 12px;
    font-weight: 600;
    line-height: 1;
  }
  .customer-language-switch.customer-language-switch button[lang="zh-CN"]::after { content: "中"; }
  .customer-language-switch.customer-language-switch button[lang="en"]::after { content: "EN"; }
  .customer-language-switch.customer-language-switch button[aria-pressed="true"] {
    color: #087f71;
    background: #fff;
    box-shadow: 0 1px 4px #233d5712;
  }
}