body {
    margin: 0;
    overflow: hidden;
}

#game-container {
    width: 100vw;
    height: 100vh;
}

#score {
    position: fixed;
    top: 20px;
    left: 20px;
    color: white;
    font-size: 24px;
    font-family: Arial, sans-serif;
}

/* 虚拟控制按钮样式 */
#mobile-controls {
    position: fixed;
    bottom: 20px;
    left: 0;
    right: 0;
    display: none; /* 默认隐藏，在移动设备上显示 */
    touch-action: none; /* 防止触摸事件引起页面滚动 */
    user-select: none; /* 防止长按选择文本 */
    -webkit-user-select: none;
    -webkit-touch-callout: none;
}

.control-group {
    position: absolute;
    display: flex;
    gap: 10px;
    z-index: 1000; /* 确保控制按钮在最上层 */
}

.control-group.left {
    left: 20px;
    bottom: 20px;
}

.control-group.right {
    right: 20px;
    bottom: 20px;
}

.control-group.shoot {
    left: 50%;
    bottom: 20px;
    transform: translateX(-50%);
}

.control-btn {
    width: 70px; /* 增大按钮尺寸 */
    height: 70px;
    background-color: rgba(255, 255, 255, 0.3);
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
    user-select: none;
    -webkit-user-select: none;
    cursor: pointer;
    touch-action: manipulation; /* 优化触摸操作 */
}

.control-btn:active {
    background-color: rgba(255, 255, 255, 0.5);
}

.control-btn#btn-shoot {
    width: 80px;
    height: 80px;
    background-color: rgba(255, 100, 100, 0.3);
    font-size: 32px;
}

.control-btn#btn-shoot:active {
    background-color: rgba(255, 100, 100, 0.5);
}

/* 响应式设计 */
@media (max-width: 768px) {
    #mobile-controls {
        display: block;
    }
    
    #score {
        font-size: 18px;
    }
}