.chat-return {
  flex: 0 1 auto;
  max-width: 38%;
  border: 1px solid currentColor;
  border-radius: 12px;
  padding: 7px 10px;
  background: transparent;
  color: inherit;
  font: inherit;
  font-size: 13px;
  line-height: 1.35;
  cursor: pointer;
  white-space: normal;
}
.chat-return[hidden] { display: none !important; }
.conversation-empty { display: none; }
body[data-chat-screen="list"] .conversation-empty {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 24px;
  text-align: center;
  line-height: 1.6;
  color: inherit;
}
body[data-chat-screen="list"] .conversation-empty span { font-size: 13px; opacity: .8; }
body[data-chat-screen="list"] :is(#chat,#composer,.communication-ready),
body[data-chat-screen="list"] .chat-head :is(.person,.detail-btn) { display: none !important; }
@media (max-width: 680px) {
  body:is([data-chat-screen="list"],[data-chat-screen="conversation"],[data-chat-screen="business"]) .app {
    grid-template-columns: minmax(0,1fr) !important;
    grid-template-rows: minmax(0,1fr) !important;
  }
  body[data-chat-screen="list"] [data-chat-workspace] { display: none !important; }
  body[data-chat-screen="list"] .sidebar {
    display: flex !important;
    flex-direction: column;
    min-height: 0 !important;
    max-height: none !important;
    height: 100%;
    overflow-y: auto;
  }
  body:is([data-chat-screen="conversation"],[data-chat-screen="business"]) .sidebar { display: none !important; }
  body:is([data-chat-screen="conversation"],[data-chat-screen="business"]) [data-chat-workspace] { min-height: 0; height: 100%; }
  body[data-chat-screen="conversation"] .chat-head { gap: 10px; }
  body[data-chat-screen="conversation"] .chat-head .person { min-width: 0; }
}