.chat-header-controls {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  padding: 4px 12px;
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
  min-width: 0;
}
.chat-header-controls #chat-mobile-back-btn { display: none; }
.chat-header-controls .chat-mode-field { min-width: 0; }
.chat-header-controls .chat-mode-select__trigger {
  border-radius: var(--radius-small);
  padding: 6px 8px;
  font-size: 13px;
  min-height: 36px;
}
.chat-header-controls #chat-mode-value { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.chat-header-controls .chat-mode-select__panel { left: auto; right: 0; }
@media (max-width: 768px) {
  .chat-header-controls { gap: 4px; padding: 2px 8px; }
  .chat-header-controls #chat-mobile-back-btn { display: inline-flex; flex: 0 0 44px; width: 44px; height: 44px; }
  body.chat-mobile-mode .chat-header-controls .chat-mode-field { flex: 0 1 auto; width: auto; margin-left: auto; }
  body.chat-mobile-mode .chat-header-controls .chat-mode-select__trigger { min-height: 44px; }
  body.chat-mobile-mode .chat-header-controls .chat-mode-select__panel {
    position: absolute;
    top: calc(100% + 4px);
    right: 0;
    left: auto;
    width: min(390px, calc(100vw - 16px));
    margin: 0;
    box-shadow: var(--shadow-card);
  }
}