body {
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    background: #f0f0f0;
  }
  
  .game-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin: 20px;
    perspective: 1000px;
  }
  
  .card {
    width: 100px;
    height: 100px;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.5s;
    cursor: pointer;
  }
  
  .card.flipped {
    transform: rotateY(180deg);
  }
  
  .card-front,
  .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2em;
    border-radius: 8px;
  }
  
  .card-front {
    background: #2196f3;
    color: white;
  }
  
  .card-back {
    background: white;
    transform: rotateY(180deg);
    border: 2px solid #2196f3;
  }
  
  .stats {
    margin: 20px;
    text-align: center;
  }
  
  button {
    padding: 10px 20px;
    font-size: 1em;
    cursor: pointer;
    background: #4caf50;
    color: white;
    border: none;
    border-radius: 4px;
  }