.memory-board {
    display: grid;
    gap: 10px;
    max-width: 600px;
    margin: 30px auto;
  }
  
  .memory-card {
    aspect-ratio: 1/1;
    perspective: 1000px;
    cursor: pointer;
  }
  
  .card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s;
    transform-style: preserve-3d;
  }
  
  .memory-card.flip .card-inner {
    transform: rotateY(180deg);
  }
  
  .card-front,
  .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    border-radius: 10px;
    backface-visibility: hidden;
  }
  
  .card-front {
    background: #2563eb;
    color: #fff;
    transform: rotateY(180deg);
  }
  
  .card-back {
    background: #e2e8f0;
  }

  .memory-steps,
.memory-tips,
.difficulty-list,
.benefit-list {
  margin-top: 20px;
  padding-left: 20px;
}

.memory-steps li,
.memory-tips li,
.difficulty-list li,
.benefit-list li {
  margin-bottom: 10px;
}