.game-board {
  display: grid;
  grid-template-columns: repeat(4, 1fr);

  gap: clamp(0.4rem, 1.2vw, 0.8rem);
  width: min(92vw, 70vh);
    max-width: 38rem; 

  padding: clamp(0.5rem, 1.5vw, 1rem);
 
  margin: 0 auto;
}

.game-board .flip-card {
width: 100%;
  aspect-ratio: 1 / 1;
  transition: transform 0.3s ease;
}

.flip-card {
  position: relative;
  cursor: pointer;
  perspective: 62rem;
}

.flip-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s cubic-bezier(0.4, 0.2, 0.2, 1);
  box-shadow: 0 0.3rem 0.4rem rgba(0, 0, 0, 0.2);
  transform-style: preserve-3d;
  border: 0.3rem solid white;
  border-radius: 0.9rem;
}

.flip-card-front,
.flip-card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 0.9rem;
}

.flip-card-front img,
.flip-card-back img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 0.9rem;
}

.flip-card-front {
  transform: rotateY(180deg);
}

.flip-card-back {
  transform: rotateY(0deg);
}

.flip-card.flipped .flip-card-inner {
  transform: rotateY(180deg);
}
.flip-card:focus {
  outline: 0.2rem solid yellow;
}

.flip-card.matched {
  animation: fadeOut 0.6s ease forwards;
  pointer-events: none;
}

/* Smaller screens adjustments */
@media (max-width: 768px) {
  .game-board {
    width: 90vw;
    gap: 0.5rem;
    padding: 0.8rem;
  }
}

/* Extra small screens */
@media (max-width: 500px) {
  .game-board {
    width: 95vw;
    height: auto;
    gap: 0.5rem;
    padding: 0.5rem;
  }
}