.animate-pulse-slow {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}
.drop-zone {
  transition: all 0.3s ease;
  cursor: pointer;
}
.drop-zone.dragover {
  background-color: #e6f3ff;
  border-color: #2563eb;
  transform: scale(1.02);
}