@media (max-width: 640px) {
  html { scroll-behavior: auto !important; }
  .dt-composer-surface,
  .dt-composer-tray,
  .dt-product-sidebar,
  .dt-popover {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    transition: none !important;
  }
  .dt-composer-surface {
    box-shadow: 0 0 0 1px var(--border), 0 2px 5px rgb(0 0 0 / 0.04) !important;
  }
  .animate-fade-in,
  .animate-slide-up,
  .dt-lead-token,
  .dt-lead-more,
  .dt-tray-value-icon,
  .dt-category-content {
    animation: none !important;
  }
  .dt-tray-reveal-run { filter: none !important; }
  /* Keep the empty-chat greeting proportional on narrow screens. */
  div:has(> img[src="/brand/black-logo.png"]):has(> h1) {
    min-width: 0;
    gap: 10px;
    justify-content: center;
  }
  img[src="/brand/black-logo.png"]:has(+ h1) {
    width: 30px;
    height: 30px;
    flex: 0 0 30px;
  }
  img[src="/brand/black-logo.png"] + h1 {
    min-width: 0;
    max-width: 100%;
    font-family: var(--font-sans), system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
    font-size: clamp(22px, 6.4vw, 28px);
    line-height: 1.4;
    letter-spacing: 0;
    font-weight: 600;
    text-wrap: balance;
    overflow-wrap: anywhere;
  }
  div:has(> div > img[src="/brand/black-logo.png"] + h1) {
    padding: 16px 16px 24px;
    min-height: 88px;
  }
  div:has(> div > .dt-composer-surface) {
    padding-left: 12px;
    padding-right: 12px;
    padding-bottom: max(12px, env(safe-area-inset-bottom));
  }
  .dt-composer-surface {
    border-radius: 20px !important;
    min-width: 0;
  }
  .dt-composer-surface textarea {
    font-size: 16px !important;
    line-height: 1.5 !important;
  }
  [data-chat-column="true"] {
    padding-left: 16px;
    padding-right: 16px;
    overflow-wrap: anywhere;
  }
  .dt-composer-tray { border-radius: 18px; }
}
@media (max-width: 640px) and (max-height: 560px) {
  div:has(> div > img[src="/brand/black-logo.png"] + h1) {
    min-height: 64px;
    padding-top: 8px;
    padding-bottom: 12px;
  }
}