body {
  font-family: Arial, sans-serif;
  background: linear-gradient(135deg, #ff9a9e, #fad0c4);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  margin: 0;
}

h1 {
  margin-bottom: 20px;
  color: #333;
}

.game-container {
  display: grid;
  grid-template-columns: repeat(4, 100px);
  grid-gap: 15px;
}

.card {
  width: 100px;
  height: 100px;
  background-color: #fff;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2em;
  cursor: pointer;
  box-shadow: 0 5px 15px rgba(0,0,0,0.2);
  transition: transform 0.3s;
  user-select: none;
}

.card.flipped {
  background-color: #6c63ff;
  color: #fff;
  transform: rotateY(180deg);
}

.message {
  margin-top: 20px;
  font-size: 1.5em;
  color: #333;
}