/* ========== 配色方案 ========== */
        :root {
            --accent-color: #f47421;
            --accent-color-hover: #e06715;
            --bg-light-gray: #f9f9f9;
            --bg-white: #ffffff;
            --border-gray: #eef2f5;
            --text-dark: #333333;
            --text-normal: #555555;
            --code-bg-gray: #f5f7fa;
            --touch-highlight: rgba(244, 116, 33, 0.1);
        }

        /* ========== 全局基础样式 ========== */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            -webkit-tap-highlight-color: transparent;
            tap-highlight-color: transparent;
        }

        body {
            font-family: "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            background-color: var(--bg-light-gray);
            color: var(--text-normal);
            line-height: 1.8;
            -webkit-overflow-scrolling: touch;
            overflow-scrolling: touch;
        }

        .book-container {
            display: flex;
            flex-direction: row;
            min-height: 100vh;
            max-width: 1600px;
            margin: 0 auto;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.02);
        }

        /* ========== 左侧导航 ========== */
        .book-nav {
            width: 280px;
            background-color: var(--bg-white);
            border-right: 1px solid var(--border-gray);
            overflow-y: auto;
            padding: 35px 0;
            -ms-overflow-style: none;
            scrollbar-width: none;
        }
        .book-nav::-webkit-scrollbar {
            display: none;
        }

        .nav-logo {
            text-align: center;
            font-size: 22px;
            font-weight: 700;
            color: var(--text-dark);
            padding: 0 20px 20px;
            border-bottom: 1px solid var(--border-gray);
            margin-bottom: 35px;
            cursor: pointer;
            position: relative;
        }
        @media screen and (max-width: 768px) {
            .nav-logo {
                position: relative;
            }
            
            .nav-logo::after {
                content: "≡";
                font-size: 18px;
                color: var(--accent-color);
                position: absolute;
                right: 20px;
                top: 50%;
                transform: translateY(-50%);
                display: block;
            }
            
            .book-nav.expanded .nav-logo::after {
                content: "▲";
            }
        }

        .nav-group-title {
            font-size: 13px;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: var(--text-normal);
            padding-left: 30px;
            margin-bottom: 15px;
        }

        .nav-menu {
            list-style: none;
            margin-bottom: 30px;
        }

         .nav-menu li {
            margin: 0;
        }

        .nav-menu a {
            display: block;
            text-decoration: none;
            color: var(--text-normal);
            font-size: 15px;
            padding: 9px 30px;
            transition: all 0.2s ease-in-out;
            /* 放大移动端点击区域 */
            min-height: 44px;
            line-height: 26px;
            /* 修改1：添加固定边框占位，避免hover时抖动 */
           border-left: 3px solid transparent;
       }

       .nav-menu a:hover,
       .nav-menu a.active,
       .nav-menu a:active { /* 新增移动端触摸反馈 */
            color: var(--accent-color); /* 应用GitBook橙色 */
            background-color: var(--touch-highlight); /* 应用GitBook橙色高亮 */
            /* 修改2：hover时替换透明边框为彩色边框，不会改变元素尺寸 */
            border-left: 3px solid var(--accent-color); /* 应用GitBook橙色 */
            padding-left: 27px; /* 修改3：调整padding-left保持文本位置一致 */
        }
        /* ========== 右侧阅读区 ========== */
        .book-content {
            flex: 1;
            background-color: var(--bg-white);
            padding: 45px 65px;
            overflow-y: auto;
            max-width: calc(1600px - 280px);
            -ms-overflow-style: none;
            scrollbar-width: none;
            -webkit-overflow-scrolling: touch;
        }
        .book-content::-webkit-scrollbar {
            display: none;
        }

        /* ========== 搜索框 ========== */
        .search-box {
            margin: 0 0 30px;
            padding: 15px 20px;
            background-color: var(--bg-light-gray);
            border: 1px solid var(--border-gray);
            border-radius: 4px;
            display: flex;
            gap: 10px;
            align-items: center;
            width: 100%;
            justify-content: center;
        }

        .search-inner {
            display: flex;
            gap: 10px;
            align-items: center;
            width: 100%;
            max-width: 500px;
        }

        .search-input {
            flex: 1;
            padding: 12px 15px;
            border: 1px solid var(--border-gray);
            border-radius: 4px;
            outline: none;
            font-size: 14px;
            color: var(--text-dark);
            background-color: var(--bg-white);
            transition: all 0.2s ease-in-out;
            min-height: 44px;
        }

        .search-input:focus {
            border-color: var(--accent-color);
            box-shadow: 0 0 5px rgba(244, 116, 33, 0.15);
        }

        .search-btn {
            padding: 12px 25px;
            border: none;
            border-radius: 4px;
            background-color: var(--accent-color);
            color: var(--bg-white);
            font-size: 14px;
            cursor: pointer;
            transition: all 0.2s ease-in-out;
            min-height: 44px;
            min-width: 80px;
        }

        .search-btn:hover,
        .search-btn:active {
            background-color: var(--accent-color-hover);
            box-shadow: 0 2px 5px rgba(244, 116, 33, 0.2);
        }

        /* ========== 面包屑 ========== */
        .breadcrumb {
            font-size: 13px;
            padding-bottom: 18px;
            border-bottom: 1px solid var(--border-gray);
            margin-bottom: 35px;
            white-space: nowrap;
            overflow-x: auto;
            -ms-overflow-style: none;
            scrollbar-width: none;
        }
        .breadcrumb::-webkit-scrollbar {
            display: none;
        }

        .breadcrumb-list {
            display: flex;
            list-style: none;
            gap: 8px;
            align-items: center;
        }

        .breadcrumb-item:not(:last-child)::after {
            content: "/";
            color: var(--border-gray);
            margin-left: 8px;
        }

        .breadcrumb a {
            color: var(--accent-color);
            text-decoration: none;
            padding: 2px 4px;
        }

        .breadcrumb a:hover,
        .breadcrumb a:active {
            color: var(--accent-color-hover);
            text-decoration: underline;
            text-underline-offset: 2px;
        }

        .breadcrumb-item:last-child {
            color: var(--text-dark);
            font-weight: 500;
        }

        /* ========== 产品列表标题 ========== */
        .list-title {
            font-size: 28px;
            color: var(--text-dark);
            font-weight: 600;
            line-height: 1.3;
            margin-bottom: 35px;
        }

        /* ========== 产品卡片样式 ========== */
        .product-cards {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 25px;
            margin-bottom: 40px;
        }
        
        /* 限制最多每行5个卡片 */
        @media (min-width: 1200px) {
            .product-cards {
                grid-template-columns: repeat(5, 1fr);
            }
        }

        .product-card {
            background-color: var(--bg-white);
            border: 1px solid var(--border-gray);
            border-radius: 8px;
            padding: 15px;
            transition: all 0.3s ease;
            cursor: pointer;
            display: flex;
            flex-direction: column;
            height: 100%;
            text-align: center;
        }

        .product-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
            border-color: var(--accent-color);
        }

        .product-card-image {
            width: 100%;
            height: 150px;
            object-fit: cover;
            border: 1px solid var(--border-gray);
            border-radius: 4px;
            margin-bottom: 12px;
            display: block;
            margin-left: auto;
            margin-right: auto;
        }

        .product-card-title {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 8px;
            line-height: 1.4;
            flex-shrink: 0;
            overflow: hidden;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            text-overflow: ellipsis;
        }

        .product-card-price {
            font-size: 18px;
            font-weight: 700;
            color: var(--accent-color);
            margin-bottom: 12px;
        }

        .product-card-button {
            display: block;
            width: 100%;
            padding: 10px;
            text-align: center;
            background-color: var(--accent-color);
            color: var(--bg-white);
            text-decoration: none;
            border-radius: 4px;
            font-size: 14px;
            font-weight: 500;
            transition: all 0.2s ease;
            border: none;
            cursor: pointer;
        }

        .product-card-button:hover {
            background-color: var(--accent-color-hover);
        }

        /* ========== 分页样式 ========== */
        .pagination {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 10px;
            margin-top: 40px;
            padding-top: 20px;
            border-top: 1px solid var(--border-gray);
        }

        .pagination-button {
            padding: 10px 20px;
            background-color: var(--bg-white);
            border: 1px solid var(--border-gray);
            border-radius: 4px;
            color: var(--text-normal);
            text-decoration: none;
            cursor: pointer;
            transition: all 0.2s ease;
            font-size: 14px;
            min-height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .pagination-button:hover:not(:disabled) {
            background-color: var(--accent-color);
            color: var(--bg-white);
            border-color: var(--accent-color);
        }

        .pagination-button:disabled {
            opacity: 0.6;
            cursor: not-allowed;
        }

        .pagination-info {
            font-size: 14px;
            color: var(--text-normal);
        }

        /* ========== 页脚 ========== */
        .content-footer {
            text-align: center;
            padding: 30px 0;
            border-top: 1px solid var(--border-gray);
            font-size: 14px;
            color: var(--text-normal);
            margin-top: 50px;
            padding: 20px 10px;
        }

        /* ========== 自适应布局 ========== */
        @media screen and (max-width: 1200px) {
            .product-cards {
                grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
                gap: 20px;
            }
        }

        @media screen and (max-width: 992px) {
            .product-cards {
                grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
                gap: 15px;
            }
        }

        @media screen and (max-width: 768px) {
            .book-container {
                flex-direction: column;
                max-width: 100%;
                box-shadow: none;
            }

            .book-nav {
                width: 100%;
                border-right: none;
                border-bottom: 1px solid var(--border-gray);
                padding: 15px 0;
                max-height: 60px;
                transition: max-height 0.3s ease;
            }

            .book-nav.expanded {
                max-height: 500px;
            }

            .nav-logo {
                font-size: 18px;
                margin-bottom: 15px;
                padding-bottom: 15px;
                line-height: 30px;
            }

            .nav-group-title {
                font-size: 12px;
                padding-left: 15px;
                margin-bottom: 10px;
            }

            .nav-menu {
                margin-bottom: 15px;
            }

            .nav-menu a {
                padding: 8px 15px;
                font-size: 14px;
                min-height: 40px;
            }

            .nav-menu a:hover,
            .nav-menu a.active,
            .nav-menu a:active {
                padding-left: 12px;
            }

            .book-content {
                max-width: 100%;
                padding: 20px 15px;
            }

            .search-box {
                display: none;
            }

            .list-title {
                font-size: 22px;
                margin-bottom: 20px;
                line-height: 1.4;
            }

            .product-cards {
                grid-template-columns: 1fr;
                gap: 15px;
            }

            .product-card {
                padding: 15px;
            }

            .product-card-image {
                height: 180px;
            }

            .product-card-title {
                font-size: 16px;
            }

            .product-card-description {
                font-size: 13px;
            }

            .product-card-price {
                font-size: 18px;
            }

            .pagination {
                gap: 5px;
                flex-wrap: wrap;
            }

            .pagination-button {
                padding: 8px 15px;
                font-size: 13px;
            }
        }

        @media screen and (max-width: 480px) {
            .product-cards {
                grid-template-columns: 1fr;
            }

            .product-card-image {
                height: 200px;
            }
        }
        .content-footer {
    /* 基础布局：居中+内边距+背景色（浅灰底色，贴合整体简约风格） */
    text-align: center;
    padding: 20px 15px;
    margin-top: 40px;
    
    border-top: 1px solid #f0e8e0; /* 浅分割线，增加层次感 */
    
    /* 文字样式：深灰主色，字号适中，行高舒适 */
    font-size: 14px;
    color: #4a5568; /* 深灰蓝，替代纯黑更柔和 */
    line-height: 1.8;
    
    /* 适配移动端 */
    width: 100%;
    box-sizing: border-box;
}

/* 备案号链接美化 */
.content-footer a {
    color: #4a5568; /* 施耐德品牌蓝/工业蓝，突出备案号且贴合色系 */
    text-decoration: none; /* 去掉默认下划线 */
    padding: 2px 6px;
    border-radius: 3px;
    transition: all 0.3s ease; /* 过渡动画，交互更丝滑 */
}

/* 链接hover效果 */
.content-footer a:hover {
    color: #ffffff; /* hover时文字变白 */
    color: #ff6600; /* 背景变品牌蓝 */
    text-decoration: none;
}

/* 响应式适配：移动端字号缩小 */
@media (max-width: 768px) {
    .content-footer {
        font-size: 12px;
        padding: 15px 10px;
    }
}