.idea-grid a > img {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: cover;
  transition: transform .4s ease;
}

.idea-grid a:hover > img {
  transform: scale(1.05);
}

@media (prefers-reduced-motion: reduce) {
  .idea-grid a > img { transition: none; }
}