:root {
    /* 基础颜色 */
    --color-background: #f0f0f0;
    --color-container: #c0c0c0;
    --color-shadow: rgba(0, 0, 0, 0.2);
    --color-header: #e0e0e0;
    --color-theme-toggle: #ffa500;
    --color-primary: #4299e1;
    --color-text: #333;
    --color-board: #999;
    --color-border: #808080;
    --color-border-light: #fff;
    --color-revealed: #e0e0e0;
    --color-mine: #ff0000;
    
    /* 数字颜色 */
    --color-number-1: #0000ff;
    --color-number-2: #008000;
    --color-number-3: #ff0000;
    --color-number-4: #000080;
    --color-number-5: #800000;
    --color-number-6: #008080;
    --color-number-7: #000000;
    --color-number-8: #808080;
    
    /* 控件颜色 */
    --color-control-bg: #fff;
    --color-control-focus: #666;
}

/* 深色模式颜色变量 */
[data-theme="dark"] {
    --color-background: #1a1a1a;
    --color-container: #2d2d2d;
    --color-shadow: rgba(0, 0, 0, 0.4);
    --color-header: #333333;
    --color-theme-toggle: #f1c40f;
    --color-primary: #4299e1;
    --color-text: #e0e0e0;
    --color-board: #404040;
    --color-border: #505050;
    --color-border-light: #666666;
    --color-revealed: #404040;
    --color-mine: #ff4444;
    
    /* 深色主题数字颜色 - 调整为更明亮的色调以提高可读性 */
    --color-number-1: #5c9eff;
    --color-number-2: #4caf50;
    --color-number-3: #ff5252;
    --color-number-4: #7986cb;
    --color-number-5: #ff8a65;
    --color-number-6: #4db6ac;
    --color-number-7: #ba68c8;
    --color-number-8: #90a4ae;
    
    /* 深色主题控件颜色 */
    --color-control-bg: #333333;
    --color-control-focus: #666666;
}

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

body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--color-background);
}

.game-container {
    background-color: var(--color-container);
    padding: 10px;
    border-radius: 8px;
    box-shadow: 0 0 10px var(--color-shadow);
}

/* 全局禁用文本选择和长按菜单 */
html, body, * {
    /* 禁用用户选择 */
    user-select: none !important;
    -webkit-user-select: none !important;
    -moz-user-select: none !important;
    -ms-user-select: none !important;
    
    /* 禁用触摸高亮 */
    -webkit-tap-highlight-color: transparent !important;
    
    /* 禁用长按菜单 */
    -webkit-touch-callout: none !important;
    
    /* 禁用拖动 */
    -webkit-user-drag: none !important;
    -khtml-user-drag: none !important;
    -moz-user-drag: none !important;
    -o-user-drag: none !important;
    user-drag: none !important;
    
    /* 禁用上下文菜单 */
    -webkit-context-menu: none !important;
    -moz-context-menu: none !important;
}

.game-controls {
    text-align: center;
    margin-bottom: 10px;
}

#difficulty {
    padding: 8px;
    font-size: 14px;
    border-radius: 4px;
    color: var(--color-text);
    border: 1px solid var(--color-border);
    background-color: var(--color-control-bg);
    cursor: pointer;
}

#difficulty:focus {
    outline: none;
    border-color: var(--color-control-focus);
}

#difficulty option[value="intermediate_phone"],
#difficulty option[value="expert_phone"] {
    display: none;
}

/* 游戏容器和游戏面板特定样式 */
.game-container,
.game-container *,
#gameBoard,
#gameBoard * {
    /* 确保这些属性不会被其他样式覆盖 */
    pointer-events: auto !important;
    touch-action: manipulation !important;
}

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--color-header);
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 6px;
}

.mine-count, .timer {
    font-family: 'Courier New', Courier, monospace;
    font-size: 24px;
    font-weight: bold;
    color: var(--color-text);
    min-width: 80px;
}

#newGameBtn {
    font-size: 24px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0 10px;
}

#newGameBtn:hover {
    transform: scale(1.1);
}

.game-board {
    display: grid;
    grid-template-columns: repeat(9, 30px);
    gap: 1px;
    background-color: var(--color-board);
    padding: 1px;
    border: 3px solid var(--color-border);
}

.cell {
    width: 30px;
    height: 30px;
    background-color: var(--color-container);
    border: 2px solid;
    border-color: var(--color-border-light) var(--color-border) var(--color-border) var(--color-border-light);
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    cursor: pointer;
    user-select: none;
}

.cell.revealed {
    border: 1px solid var(--color-border);
    background-color: var(--color-revealed);
}

.cell.mine {
    background-color: var(--color-mine);
}

.cell.flagged {
    background-color: var(--color-container);
}

.cell[data-number="1"] { color: var(--color-number-1); }
.cell[data-number="2"] { color: var(--color-number-2); }
.cell[data-number="3"] { color: var(--color-number-3); }
.cell[data-number="4"] { color: var(--color-number-4); }
.cell[data-number="5"] { color: var(--color-number-5); }
.cell[data-number="6"] { color: var(--color-number-6); }
.cell[data-number="7"] { color: var(--color-number-7); }
.cell[data-number="8"] { color: var(--color-number-8); }

/* 操作提示样式 */
.game-instructions {
    margin-top: 10px;
    padding: 10px;
    background-color: var(--color-header);
    border-radius: 4px;
    font-size: 14px;
    text-align: center;
    color: var(--color-text);
}

.instructions {
    display: none;
}

@media (max-width: 600px) {
    .game-container {
        padding: 10px;
    }

    /* 为非初级难度添加顶部外边距 */
    .game-container.non-beginner {
        margin-top: 80px;
    }

    .game-controls {
        margin-bottom: 10px;
    }

    .game-board {
        grid-template-columns: repeat(9, 25px);
    }

    .cell {
        width: 28px;
        height: 28px;
        font-size: 12px;
    }
    
    /* 在手机端隐藏普通的中级和高级选项 */
    #difficulty option[value="intermediate"],
    #difficulty option[value="expert"] {
        display: none;
    }

    #difficulty option[value="intermediate_phone"],
    #difficulty option[value="expert_phone"] {
        display: block;
    }
    
    /* 在移动设备上显示移动操作提示 */
    #mobile-instructions {
        display: block;
    }
    
    #pc-instructions {
        display: none;
    }
}

@media (min-width: 601px) {
    /* 在PC设备上显示PC操作提示 */
    #mobile-instructions {
        display: none;
    }
    
    #pc-instructions {
        display: block;
    }
}

/* 控制按钮样式 */
.control-button {
    position: fixed;
    width: 40px;
    height: 40px;
    top: 20px;
    border: none;
    border-radius: 50%;
    background-color: var(--color-control-bg);
    color: var(--color-text);
    cursor: pointer;
    box-shadow: 0 2px 5px var(--color-shadow);
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.3s ease;
    -webkit-tap-highlight-color: transparent;
    outline: none;
}

.control-button:hover {
    transform: scale(1.1);
    background-color: var(--color-header);
}

/* 返回按钮位置 */
#back-button {
    left: 20px;
    color: var(--color-primary);
}

/* 主题切换按钮位置 */
#theme-button {
    right: 20px;
    color: var(--color-theme-toggle);
}

/* 移动端适配 */
@media (max-width: 600px) {
    .control-button {
        width: 36px;
        height: 36px;
    }
}