body {
  margin: 0;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: linear-gradient(180deg, #c4d7e0, #eaf6f6);
  font-family: 'Poppins', sans-serif;
}

.game-container {
  position: relative;
  text-align: center;
}

.title {
  font-size: 2rem;
  color: #37474f;
  margin-bottom: 1rem;
}

canvas {
  background: #fefefe;
  border: 3px solid #b0bec5;
  border-radius: 10px;
  box-shadow: 0 0 15px rgba(0,0,0,0.2);
}

.ui {
  margin-top: 1rem;
}

.score-board {
  font-size: 1.2rem;
  color: #37474f;
}

.btn {
  padding: 10px 20px;
  margin-top: 1rem;
  border: none;
  background: #90caf9;
  color: #fff;
  font-size: 1rem;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.3s ease;
}

.btn:hover {
  background: #42a5f5;
}

.hidden {
  display: none;
}