body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  background-color: #f0f0f0;
  font-family: Arial, sans-serif;
  /* 禁止默认触摸行为 */
  touch-action: none;
}

.game-container {
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 100%;
  flex-wrap: wrap;
}

#gameCanvas {
  border: 2px solid #333;
  border-radius: 5px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  margin: 0 auto;
  /* 禁止画布默认触摸行为 */
  touch-action: none;
}

#gameControls {
  text-align: center;
  margin: 0 auto;
  padding: 0 8px;
}

#gameScore {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

#score {
  font-size: 24px;
  margin: 10px 0;
}

#startBtn {
  font-size: 18px;
  padding: 12px 24px;
  background: linear-gradient(145deg, #f0f0f0, #cacaca);
  color: #333;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 5px 5px 10px #bebebe,
    -5px -5px 10px #ffffff;
  position: relative;
  overflow: hidden;
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* 其他CSS样式保持不变 */
#startBtn::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  right: 2px;
  bottom: 50%;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.3), transparent);
  border-radius: 8px 8px 0 0;
  pointer-events: none;
}

#startBtn:hover {
  transform: translateY(-2px);
  box-shadow: 6px 6px 12px #bebebe,
    -6px -6px 12px #ffffff;
  background: linear-gradient(145deg, #f5f5f5, #d0d0d0);
}

#startBtn:active {
  transform: translateY(1px);
  box-shadow: inset 4px 4px 8px #bebebe,
    inset -4px -4px 8px #ffffff;
  background: linear-gradient(145deg, #e6e6e6, #c0c0c0);
}

.controls {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  width: 180px;
  margin: 20px auto;
}

.control-btn {
  width: 60px;
  height: 60px;
  font-size: 24px;
  background: linear-gradient(145deg, #f0f0f0, #cacaca);
  color: #333;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  /* 优化触摸交互 */
  touch-action: manipulation;
  /* 防止文字选中 */
  user-select: none;

  transition: all 0.3s ease;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 5px 5px 10px #bebebe,
    -5px -5px 10px #ffffff;
  position: relative;
  overflow: hidden;
}

/* 其他控制按钮样式保持不变 */
.control-btn::before {
  content: '';
  position: absolute;
  top: 5%;
  left: 5%;
  right: 5%;
  bottom: 5%;
  border-radius: 50%;
  z-index: -1;
}

.control-btn:hover {
  transform: translateY(-2px);
  box-shadow: 6px 6px 12px #bebebe,
    -6px -6px 12px #ffffff;
}

.control-btn:active {
  transform: translateY(1px);
  box-shadow: inset 4px 4px 8px #bebebe,
    inset -4px -4px 8px #ffffff;
}

#up {
  grid-column: 2;
}

#left {
  grid-column: 1;
  grid-row: 2;
}

#right {
  grid-column: 3;
  grid-row: 2;
}

#down {
  grid-column: 2;
  grid-row: 3;
}