* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: 'Nunito', sans-serif;
  background: linear-gradient(to right, #a18cd1, #fbc2eb);
  text-align: center;
  padding: 30px;
  color: #333;
}
h1 {
  font-size: 2.5rem;
  margin-bottom: 10px;
}
#status {
  font-size: 1.2rem;
  margin: 10px 0 20px 0;
}
.game-board {
  display: grid;
  grid-template-columns: repeat(4, 100px);
  gap: 15px;
  justify-content: center;
  margin-bottom: 20px;
}
.card {
  width: 100px;
  height: 100px;
  background-color: lightgreen;
  color: white;
  font-size: 40px;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  border-radius: 15px;
  user-select: none;
  transition: transform 0.3s, background-color 0.3s;
  box-shadow: 0 4px 8px rgba(0,0,0,0.3);
}
.card.flipped {
  background-color: #fff;
  color: #4CAF50;
  border: 2px solid #4CAF50;
  transform: rotateY(180deg);
}
button {
  background-color: #ff9800;
  color: white;
  font-size: 16px;
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  box-shadow: 0 4px 8px rgba(0,0,0,0.3);
}
button:hover {
  background-color: #e68900;
}
#message {
  font-size: 1.4rem;
  margin-top: 10px;
  color: darkgreen;
}