@keyframes story-brief-thinking-fallback {
  0%, 100% {
    background-position: 0% 50%;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0), 0 0 0 rgba(239, 156, 48, 0);
  }
  50% {
    background-position: 100% 50%;
    box-shadow: inset 0 0 36px rgba(255, 255, 255, 0.38), 0 0 24px rgba(239, 156, 48, 0.14);
  }
}

.story-brief--thinking,
section[aria-live="polite"]:has(button[disabled]) {
  background-image: linear-gradient(112deg, #fae7e1 8%, #ffece3 34%, #ffe0bd 50%, #f3e6ee 68%, #fae7e1 92%);
  background-size: 240% 100%;
  animation: story-brief-thinking-fallback 3.6s ease-in-out infinite;
}

@media (prefers-reduced-motion: reduce) {
  .story-brief--thinking,
  section[aria-live="polite"]:has(button[disabled]) {
    animation: none;
  }
}