/* --- 极简响应式CSS，确保极致加载速度 --- */
        :root {
            --primary-color: #0056b3;
            --secondary-color: #ff6600;
            --text-dark: #333333;
            --bg-light: #f8f9fa;
            --border-color: #e0e0e0;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        
        /* 启用平滑滚动效果 */
        html { scroll-behavior: smooth; scroll-padding-top: 130px; } 
        
        body { font-family: "Helvetica Neue", Helvetica, Arial, "Microsoft YaHei", sans-serif; line-height: 1.6; color: var(--text-dark); background-color: #fff; -webkit-font-smoothing: antialiased; }
        img { max-width: 100%; height: auto; display: block; }
        
        .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        .section-title { text-align: center; font-size: 2rem; color: #111; margin-bottom: 40px; position: relative; padding-bottom: 10px; }
        .section-title::after { content: ''; width: 60px; height: 3px; background: var(--primary-color); position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); }
        
        /* Header 布局重构：Logo与电话在上，导航在下 */
        header { background: #fff; box-shadow: 0 2px 10px rgba(0,0,0,0.05); position: sticky; top: 0; z-index: 1000; }
        .header-top { display: flex; justify-content: space-between; align-items: center; padding: 15px 0; border-bottom: 1px solid #f1f3f5; }
        .logo { flex: 0 0 auto; }
        .bt { font-size: 1.5rem; color: var(--primary-color); line-height: 1.2; font-weight: 700; }
		.logo a {text-decoration: none;}
        .logo span { font-size: 0.85rem; color: #666; display: block; margin-top: 4px; letter-spacing: 1px; }
        
        .header-rt { text-align: right; flex: 0 0 auto; }
        .hotline { font-size: 1.4rem; color: var(--secondary-color); font-weight: bold; text-decoration: none; display: block; }
        
        /* 桌面端独立成行的主导航条 */
        .main-nav { background: #fff; padding: 10px 0; display: block; }
        .nav-list { display: flex; list-style: none; gap: 40px; justify-content: center; align-items: center; }
        .nav-list a { text-decoration: none; color: #495057; font-weight: 500; font-size: 1.05rem; transition: all 0.2s; padding: 5px 0; white-space: nowrap; }
        .nav-list a:hover { color: var(--primary-color); border-bottom: 2px solid var(--primary-color); }
        
        /* 隐藏移动端菜单触发器 */
        .menu-toggle, .menu-btn { display: none; }
        
        /* Hero Banner */
        .hero { background: linear-gradient(135deg, #004094 0%, #0072ff 100%); color: #fff; padding: 70px 0; text-align: center; }
        .hero h2 { font-size: 2.5rem; margin-bottom: 20px; font-weight: 700; }
		.hero h1 { font-size: 2.5rem; margin-bottom: 20px; font-weight: 700; }
        .hero p { font-size: 1.2rem; max-width: 800px; margin: 0 auto 30px; opacity: 0.9; padding: 0 15px; }
        .btn { display: inline-block; background: var(--secondary-color); color: #fff; padding: 12px 35px; text-decoration: none; border-radius: 4px; font-weight: bold; transition: background 0.3s; box-shadow: 0 4px 10px rgba(255,102,0,0.3); }
        .btn:hover { background: #e05500; }

        /* Intro (图文并茂布局) */
        .intro { padding: 60px 0; background: var(--bg-light); }
        .intro-flex { display: flex; align-items: center; gap: 40px; }
        .intro-content { flex: 1; }
        .intro-text { font-size: 1.05rem; line-height: 1.8; color: #444; text-indent: 2em; text-align: justify; }
        .intro-img { flex: 1; border-radius: 8px; overflow: hidden; box-shadow: 0 4px 15px rgba(0,0,0,0.1); background: #eee; min-height: 300px; display: flex; align-items: center; justify-content: center; color: #999; }

        /* Product Recommendation (新产品推荐栏目) */
        .prod-rec { padding: 60px 0; background: #fff; }
        .rec-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; margin-top: 20px; }
        .rec-card { border: 1px solid var(--border-color); border-radius: 8px; overflow: hidden; background: #fff; transition: transform 0.3s, box-shadow 0.3s; display: flex; flex-direction: column; }
        .rec-card:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0,0,0,0.1); }
        .rec-img-holder { width: 100%; height: 200px; background: #e9ecef; display: flex; align-items: center; justify-content: center; color: #888; font-weight: bold; overflow: hidden; position: relative; }
        .rec-img-holder img { width: 100%; height: 100%; object-fit: cover; }
        .rec-img-holder span { position: absolute; bottom: 0; left: 0; right: 0; background: rgba(0,0,0,0.6); color: #fff; padding: 5px 10px; font-size: 0.9rem; text-align: center; font-weight: normal; }
        .rec-info { padding: 20px; flex: 1; display: flex; flex-direction: column; justify-content: space-between; }
        .rec-info h3 { font-size: 1.25rem; color: var(--primary-color); margin-bottom: 10px; }
        .rec-info p { font-size: 0.9rem; color: #666; margin-bottom: 15px; line-height: 1.5; }
        .rec-tags { display: flex; gap: 8px; flex-wrap: wrap; }
        .rec-tag { font-size: 0.8rem; padding: 3px 8px; background: #f1f3f5; color: #495057; border-radius: 4px; }

        /* Advantages */
        .adv { padding: 60px 0; background: var(--bg-light); }
        .adv-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 25px; }
        .adv-card { background: #fff; padding: 30px 20px; border-radius: 6px; box-shadow: 0 4px 15px rgba(0,0,0,0.05); border-top: 4px solid var(--primary-color); text-align: center; }
        .adv-card h3 { margin-bottom: 15px; font-size: 1.25rem; color: #111; }
        .adv-card p { font-size: 0.95rem; color: #666; line-height: 1.6; }

        /* ROI Comparison */
        .compare { padding: 60px 0; background: #fff; }
        .table-responsive { width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; margin-top: 20px; border: 1px solid var(--border-color); border-radius: 6px; }
        .compare-table { width: 100%; border-collapse: collapse; min-width: 750px; }
        .compare-table th, .compare-table td { padding: 15px; text-align: left; border-bottom: 1px solid var(--border-color); font-size: 0.95rem; }
        .compare-table th { background: var(--primary-color); color: #fff; font-weight: 600; }
        .compare-table tr:nth-child(even) { background: var(--bg-light); }
        .compare-table tr:last-child td { border-bottom: none; }
        .highlight-benefit { color: #d9534f; font-weight: bold; }

        /* Process & How it works */
        .how-it-works { padding: 60px 0; background: var(--bg-light); }
        .step-box { background: #fff; padding: 25px; border-radius: 6px; margin-bottom: 20px; border-left: 5px solid var(--secondary-color); box-shadow: 0 2px 8px rgba(0,0,0,0.02); }
        .step-box:last-child { margin-bottom: 0; }
        .step-box h3 { margin-bottom: 12px; color: var(--primary-color); font-size: 1.3rem; }
        .step-box p { color: #444; }

        /* Materials */
        .materials { padding: 60px 0; background: #fff; }
        .materials h3 { font-size: 1.2rem; color: #222; }
        .mat-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 15px 0 30px; }
        .tag { background: #e9ecef; padding: 8px 18px; border-radius: 20px; font-size: 0.95rem; color: #495057; font-weight: 500; }
        .materials p { margin-bottom: 8px; font-size: 0.95rem; color: #444; }
        .materials p strong { color: var(--primary-color); }

        /* Technical Data Table */
        .tech-data { padding: 60px 0; background: var(--bg-light); }
        .data-table { width: 100%; border-collapse: collapse; min-width: 900px; background: #fff; }
        .data-table th, .data-table td { padding: 12px 10px; border: 1px solid var(--border-color); text-align: center; font-size: 0.9rem; }
        .data-table th { background: #343a40; color: #fff; font-weight: 500; }
        .data-table tr:nth-child(even) { background: #fcfcfc; }

        /* News Section */
        .news-section { padding: 60px 0; background: #fff; }
        .news-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 30px; margin-top: 20px; }
        .news-card { border-bottom: 1px dashed var(--border-color); padding-bottom: 20px; display: flex; flex-direction: column; justify-content: space-between; }
        .news-card h3 { font-size: 1.15rem; margin-bottom: 10px; line-height: 1.4; font-weight: 600; }
        .news-card h3 a { color: #212529; text-decoration: none; transition: color 0.2s; }
        .news-card h3 a:hover { color: var(--primary-color); }
        .news-meta { font-size: 0.85rem; color: #999; display: flex; gap: 15px; margin-top: 15px; }

        /* Footer */
        footer { background: #212529; color: #b5b9bd; padding: 40px 0; text-align: center; font-size: 0.9rem; line-height: 1.8; }
        footer p { margin-bottom: 8px; }
        footer p strong { color: #fff; }
        footer a { color: #fff; text-decoration: none; }
        footer a:hover { text-decoration: underline; }

        /* --- 响应式适配与移动端折叠规则 --- */
        @media (max-width: 992px) {
            .nav-list { gap: 20px; }
            .logo h1 { font-size: 1.3rem; }
            .hotline { font-size: 1.2rem; }
        }

        @media (max-width: 768px) {
            html { scroll-padding-top: 90px; } /* 移动端顶部吸顶高度变小 */
            
            .header-top { padding: 10px 0; position: relative; }
            .logo h1 { font-size: 1.1rem; }
            .logo span { font-size: 0.75rem; letter-spacing: 0; }
            .header-rt { margin-right: 45px; text-align: right; } /* 留出汉堡按钮空间 */
            .hotline { font-size: 1rem; }
            
            /* 汉堡菜单按钮CSS样式 */
            .menu-btn { display: block; position: absolute; right: 20px; top: 50%; transform: translateY(-50%); cursor: pointer; padding: 10px 0; z-index: 1002; }
            .menu-btn .icon-bar { display: block; width: 22px; height: 2px; background: #333; margin: 4px 0; transition: all 0.2s; }
            
            /* 移动端菜单折叠基础状态 */
            .main-nav { display: block; position: absolute; top: 100%; left: 0; right: 0; background: #fff; border-top: 1px solid var(--border-color); border-bottom: 2px solid var(--primary-color); max-height: 0; overflow: hidden; opacity: 0; transition: all 0.3s ease-in-out; padding: 0; }
            .nav-list { flex-direction: column; gap: 0; width: 100%; padding: 10px 0; }
            .nav-list li { width: 100%; text-align: center; }
            .nav-list a { display: block; padding: 12px 0; font-size: 1rem; border-bottom: 1px solid #f8f9fa; }
            .nav-list li:last-child a { border-bottom: none; }
            .nav-list a:hover { border-bottom: none; background: var(--bg-light); }
            
            /* 纯CSS状态联动：当Checkbox被勾选时，展开菜单并转化按钮形状 */
            .menu-toggle:checked ~ .main-nav { max-height: 400px; opacity: 1; }
            .menu-toggle:checked ~ .menu-btn .icon-bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
            .menu-toggle:checked ~ .menu-btn .icon-bar:nth-child(2) { opacity: 0; }
            .menu-toggle:checked ~ .menu-btn .icon-bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

            /* 其他版块在手机端的填充优化 */
            .intro-flex { flex-direction: column; gap: 30px; }
            .intro-img { width: 100%; min-height: 230px; }
            .section-title { font-size: 1.6rem; margin-bottom: 30px; }
            .hero { padding: 50px 0; }
            .hero h2 { font-size: 1.7rem; }
            .hero p { font-size: 0.95rem; }
            .btn { width: 100%; max-width: 300px; padding: 12px 10px; font-size: 0.95rem; }
            .prod-rec, .adv, .compare, .how-it-works, .materials, .tech-data, .news-section { padding: 40px 0; }
        }

        @media (max-width: 414px) {
            .header-rt p { display: none; } /* 极窄屏幕隐藏“全国销售热线”提示文本 */
            .logo h1 { font-size: 1rem; }
        }