.card {
  width: 100%;
  aspect-ratio: 4 / 3;   /* controls height automatically */
  overflow: hidden;
}

.card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: clamp(1rem, 2vw, 2rem);
}