body {
  font-family: Arial, sans-serif;
  background: #0b0f1a;
  color: #fff;
  text-align: center;
}

h1 {
  margin-top: 20px;
}

.game-board {
  display: grid;
  grid-template-columns: repeat(4, 80px);
  gap: 15px;
  justify-content: center;
  margin: 30px auto;
}

.card {
  width: 80px;
  height: 80px;
  background: #7c3aed;
  border-radius: 10px;
  cursor: pointer;
  font-size: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(1);
  transition: transform 0.3s;
}

.card.open {
  background: #fff;
  color: #000;
}

.card.matched {
  background: #22c55e;
  color: #000;
  cursor: default;
}

.card:hover {
  transform: scale(1.05);
}

button {
  padding: 10px 20px;
  border: none;
  background: #7c3aed;
  color: #fff;
  border-radius: 20px;
  cursor: pointer;
}