.memory-grid {
  display: grid;
  grid-template-columns: repeat(4, 80px);
  gap: 10px;
}

.card {
  width: 80px;
  height: 80px;
  border-radius: 12px;
  cursor: pointer;
  position: relative;
  perspective: 600px;
}

.card-inner {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  transition: transform 0.35s ease;
}

.card.flipped .card-inner,
.card.matched .card-inner {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  inset: 0;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  backface-visibility: hidden;
}

.card-back {
  background: var(--bg-soft);
  border: 2px solid var(--border);
}

.card-back::after {
  content: '?';
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--accent);
  text-shadow: 0 0 8px rgba(124, 92, 255, 0.7);
}

.card-front {
  background: var(--card);
  border: 2px solid var(--accent);
  box-shadow: inset 0 0 12px rgba(124, 92, 255, 0.35);
  transform: rotateY(180deg);
}

.card.matched .card-front {
  border-color: var(--accent-3);
  background: rgba(51, 214, 159, 0.14);
}

.message {
  min-height: 1.4em;
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--amber);
  text-align: center;
  text-shadow: 0 0 8px rgba(255, 207, 77, 0.6);
}

@media (max-width: 420px) {
  .memory-grid {
    grid-template-columns: repeat(4, 64px);
  }
  .card {
    width: 64px;
    height: 64px;
  }
}