.file-thumb {
  width: 32px;
  height: 32px;
  object-fit: cover;
  border-radius: 6px;
  background: #f3f4f6;
}
.drag-active {
  border-color: #6366f1 !important;
  background: #eef2ff !important;
}
.fade-in {
  animation: fadeIn 0.5s;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: none; }
}