body {
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(to right, #f5f7fa, #c3cfe2);
  margin: 0;
  padding: 20px;
  text-align: center;
}

.game-container {
  max-width: 600px;
  margin: auto;
}

.grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-top: 20px;
}

.card {
  background: #ffffff;
  border-radius: 10px;
  font-size: 2rem;
  height: 80px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, color 0.3s ease;
  color: transparent;
  user-select: none;
}

.card.flipped,
.card.matched {
  background: #e0ffe0;
  color: black;
}

.stats {
  display: flex;
  justify-content: space-around;
  margin-top: 10px;
  font-weight: bold;
}

#message {
  margin-top: 20px;
  font-size: 1.2rem;
  color: #333;
}