.memory-board {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.65rem;
  max-width: 420px;
  margin: 0 auto;
}

.memory-card {
  aspect-ratio: 1;
  perspective: 600px;
  cursor: pointer;
  border: none;
  background: none;
  padding: 0;
  min-height: 44px;
}

.memory-card:disabled {
  cursor: default;
}

.memory-card__inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.45s cubic-bezier(0.34, 1.56, 0.64, 1);
  transform-style: preserve-3d;
}

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

.memory-card__face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(1.5rem, 6vw, 2.25rem);
  font-weight: 800;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.memory-card__face--back {
  background: linear-gradient(135deg, #7C3AED, #6D28D9);
  color: #fff;
  font-family: var(--font-display, 'Fredoka', sans-serif);
  font-size: 1.5rem;
}

.memory-card__face--front {
  background: #fff;
  transform: rotateY(180deg);
  border: 3px solid #E2E8F0;
}

.memory-card.matched .memory-card__face--front {
  border-color: #10B981;
  background: #ECFDF5;
}

@media (prefers-reduced-motion: reduce) {
  .memory-card__inner { transition: none; }
}

@media (max-width: 380px) {
  .memory-board {
    gap: 0.45rem;
  }
}