* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Arial', sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background: linear-gradient(135deg, #1a1a2e, #162447);
}

.game-container {
  position: relative;
  width: 400px;
  height: 600px;
  border-radius: 20px;
  overflow: hidden;
  background-color: #0f0f1a;
  box-shadow: 0 0 30px rgba(0,0,0,0.5);
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.score-container {
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 24px;
  font-weight: bold;
  color: #fff;
  z-index: 10;
}

#restartBtn {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 20px;
  font-size: 18px;
  background-color: #ff4c4c;
  color: #fff;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  display: none;
  z-index: 10;
}

#restartBtn:hover {
  background-color: #ff1f1f;
}