#chat-summary-loading-message {
  transition: opacity 0.3s ease-in-out;
  display: inline-block;
  line-height: 1.2;
  background: linear-gradient(90deg,
    #74757E 0%,
    #9a9ca5 50%,
    #74757E 100%
  );
  background-size: 200% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  animation: shimmer 1.5s linear infinite;
}

#chat-summary-loading-message.fade-out {
  opacity: 0;
}

@keyframes shimmer {
  from { background-position: -200% 0; }
  to { background-position: 200% 0; }
}