#game-board .memory-card {
  perspective: 1000px;
}
#memory-game {
  visibility: visible;
}
.memory-card {
  opacity: 0;
  transform: rotateY(180deg) scale(0.9);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.memory-card.animate-in {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.memory-card-inner {
  width: 100%;
  aspect-ratio: 1 / 1;
  position: relative;
  cursor: pointer;
  transition: transform 0.6s;
  transform-style: preserve-3d;
}
.memory-card.flipped .memory-card-inner {
  transform: rotateY(180deg);
}
.memory-card-front,
.memory-card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 8px;
  border: 2px solid #dee2e6;
  display: flex;
  align-items: center;
  justify-content: center;
  backface-visibility: hidden;
  transition: background-color 0.3s, color 0.3s;
}

.memory-card-back {
    font-size: clamp(2rem, 7vw, 6rem);
}
.memory-card-front {
  background-color: #333;
  color: transparent;
}
.memory-card-back {
  background-color: #eee;
  color: #000;
  transform: rotateY(180deg);
  flex-direction: column;
}
.memory-card.matched .memory-card-back {
  background-color: #198754;
  color: white;
}
.memory-card.matched .memory-card-back small {
  display: block;
}
.memory-card-back small {
  display: none;
  font-size: 0.6rem;
  margin-top: 4px;
}