body {
  margin: 0;
  font-family: Arial, sans-serif;
  background-color: #2e7d32;
  color: white;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
}
h1 {
  margin: 20px 0 10px;
}
.game-container {
  text-align: center;
  position: relative;
}
.board {
  display: flex;
  flex-wrap: wrap;
  width: 360px;
  justify-content: center;
  gap: 10px;
}
.card {
  width: 80px;
  height: 80px;
  background-color: #fff;
  color: #000;
  font-size: 2.5rem;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  user-select: none;
  border-radius: 8px;
  transition: transform 0.2s ease;
}
.card.revealed {
  background-color: #c8e6c9;
}
.hidden {
  display: none;
}
.message-box {
  background-color: rgba(102, 187, 106, 0.85);
  background-color: #66bb6a;
  padding: 20px;
  border-radius: 10px;
  font-size: 1.5rem;
}
#win-message {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  z-index: 10;
}
.win-fireworks {
  width: 200px;
  margin-top: 20px;
}
@media (max-width: 500px) {
  .board {
    width: 310px;
    gap: 8px;
  }
  .card {
    width: 70px;
    height: 70px;
    font-size: 2rem;
  }
}