/* --- 1. 全局交互与重置 --- */
        * { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }

        body { 
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
            background-color: #f8fafc;
            color: #334155;
            line-height: 1.8;
        }

        /* 全局文字选中反应：#0064E0 深蓝 */
        ::selection { background: #e0eeff; color: #0064E0; }
        ::-moz-selection { background: #e0eeff; color: #0064E0; }

        /* --- 2. 布局容器 (PC端 1440px) --- */
        .container-final {
            max-width: 1440px;
            margin: 0 auto;
            padding: 40px 20px;
            display: flex;
            gap: 24px;
            align-items: flex-start;
        }

        .card-style {
            background: #ffffff;
            border: 1px solid #e2e8f0;
            border-radius: 12px;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
        }

        /* --- 3. 左侧目录交互 (#0064E0) --- */
        .sidebar-toc {
            width: 260px;
            flex-shrink: 0;
            padding: 24px;
        }

        .sidebar-toc .toc-title {
            font-weight: 600; 
            margin-bottom: 15px; 
            color: #1e293b; 
            border-left: 4px solid #0064E0; 
            padding-left: 10px;
        }

        .sidebar-toc ul { list-style: none; }
        .sidebar-toc li { margin-bottom: 12px; }
        .sidebar-toc a {
            text-decoration: none;
            color: #64748b;
            font-size: 14px;
            display: inline-block;
            transition: all 0.3s ease;
        }

        .sidebar-toc a:hover {
            color: #0064E0;
            transform: translateX(8px);
            font-weight: 600;
        }

        /* --- 4. 右侧内容区 --- */
        .content-area {
            flex: 1;
            min-width: 0;
            padding: 50px 60px;
        }

        /* 概要渐变色 */
        .abstract-gradient {
            background: linear-gradient(135deg, #f0f7ff 0%, #e0eeff 50%, #f0f7ff 100%);
            border: 1px solid rgba(0, 100, 224, 0.1);
            padding: 24px;
            border-radius: 10px;
            margin-bottom: 35px;
        }

        .abstract-gradient strong { 
            color: #0064E0; 
            display: block; 
            margin-bottom: 8px; 
            font-size: 20px;
            font-weight: 700;
        }

        /* --- 5. 正文段落高亮交互 (核心部分) --- */
        .post-body section {
            padding: 18px 28px;
            margin: 15px -28px; 
            border-radius: 8px;
            transition: all 0.3s ease;
            cursor: default;
        }

        /* PC端悬停：背景微亮 + 左侧深蓝指引线 */
        .post-body section:hover {
            background-color: rgba(0, 100, 224, 0.04); 
            box-shadow: inset 4px 0 0 #0064E0; 
            color: #0f172a; 
        }

        /* 文章标题样式 */
        .post-body h1 {
            font-size: 32px;
            color: #1e293b;
            margin-bottom: 30px;
            line-height: 1.3;
            font-weight: 700;
        }

        .post-body h2 { 
            font-size: 24px; 
            margin: 35px 0 20px 0; 
            color: #1e293b; 
            font-weight: 600;
            padding-bottom: 8px;
            border-bottom: 2px solid #e0eeff;
        }

        .post-body h3 {
            font-size: 20px;
            margin: 20px 0 15px 0;
            color: #0064E0;
            font-weight: 600;
        }

        /* 正文样式优化 */
        .post-body p {
            margin-bottom: 18px;
            font-size: 16px;
        }

        .post-body ul {
            margin: 15px 0 25px 30px;
        }

        .post-body li {
            margin-bottom: 12px;
            font-size: 16px;
        }

        /* 强调文本样式 */
        .post-body strong {
            color: #0064E0;
            font-weight: 700;
        }

        /* 对比模块样式 */
        .comparison-box {
            display: flex;
            gap: 20px;
            margin: 25px 0;
            flex-wrap: wrap;
        }

        .comparison-card {
            flex: 1;
            min-width: 280px;
            padding: 20px;
            border-radius: 8px;
        }

        .card-cheap {
            background: #fef2f2;
            border: 1px solid #fee2e2;
            border-left: 4px solid #ef4444;
        }

        .card-pro {
            background: #f0f7ff;
            border: 1px solid #e0eeff;
            border-left: 4px solid #0064E0;
        }

        .comparison-card h4 {
            font-size: 18px;
            margin-bottom: 15px;
            font-weight: 600;
        }

        .card-cheap h4 { color: #ef4444; }
        .card-pro h4 { color: #0064E0; }

        /* 核心优势列表 */
        .benefits-list {
            background: #f1f5f9;
            padding: 20px;
            border-radius: 8px;
            margin: 30px 0;
            border-left: 4px solid #0064E0;
        }

        .benefits-list h3 {
            margin-top: 0;
            color: #1e293b;
        }

        .benefits-list ul {
            margin: 10px 0 0 20px;
            padding: 0;
        }

        .benefits-list li {
            margin-bottom: 8px;
            font-size: 16px;
        }

        /* CTA按钮样式 */
        .cta-button {
            display: inline-block;
            background: #0064E0;
            color: white;
            padding: 15px 30px;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 600;
            font-size: 18px;
            margin: 20px 0 30px 0;
            transition: all 0.3s ease;
            box-shadow: 0 4px 12px rgba(0, 100, 224, 0.2);
        }

        .cta-button:hover {
            background: #0050b8;
            transform: translateY(-3px);
            box-shadow: 0 6px 18px rgba(0, 100, 224, 0.3);
        }

        /* --- 6. 移动端优化 (恢复悬停反馈) --- */
        @media (max-width: 992px) {
            .container-final {
                flex-direction: column; /* 垂直排版 */
                padding: 10px 10px;
            }

            .sidebar-toc {
                width: 100%;
                margin-bottom: 15px;
            }

            .content-area {
                padding: 30px 25px; /* 舒适的左右内边距 */
            }

            .post-body section {
                margin: 5px 0; 
                padding: 12px 15px; /* 调整内边距，确保指引线显示在正确位置 */
            }

            .post-body h1 {
                font-size: 26px;
            }

            .post-body h2 {
                font-size: 22px;
            }

            .post-body h3 {
                font-size: 18px;
            }

            .comparison-box {
                flex-direction: column;
                gap: 15px;
            }

            /* 在移动端恢复悬停效果：点击即触发 */
            .post-body section:hover, .post-body section:active {
                background-color: rgba(0, 100, 224, 0.04); 
                box-shadow: inset 4px 0 0 #0064E0; /* 恢复左侧深蓝线 */
                color: #0f172a;
            }
        }