/* 全局样式统一 & 响应式基础 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Arial', sans-serif;
            color: #333;
            line-height: 1.7;
            background-color: #f8f9fa;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }
        .section-wrapper {
            padding: 40px 0;
        }
        /* 标题样式统一 */
        .main-title {
            font-size: 28px;
            color: #1a237e;
            font-weight: 700;
            margin-bottom: 35px;
            padding-bottom: 12px;
            border-bottom: 3px solid #2196F3;
            line-height: 1.3;
        }
        .section-title {
            font-size: 22px;
            color: #1a237e;
            font-weight: 600;
            margin-bottom: 25px;
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .section-title::before {
            content: "";
            width: 5px;
            height: 30px;
            background: #2196F3;
            border-radius: 3px;
        }
        .sub-title {
            font-size: 18px;
            color: #2196F3;
            font-weight: 600;
            margin-bottom: 18px;
        }
        /* 卡片基础样式 */
        .card {
            background: #fff;
            border-radius: 10px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.08);
            padding: 25px;
            margin-bottom: 25px;
            transition: all 0.3s ease;
        }
        .card:hover {
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        /* 分类模块样式 */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 20px;
            margin-bottom: 30px;
        }
        .category-card {
            background: #f0f8ff;
            border-left: 4px solid #2196F3;
            padding: 20px;
            border-radius: 8px;
        }
        .category-card h4 {
            color: #1a237e;
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 12px;
        }
        .category-card ul {
            list-style: none;
            padding-left: 0;
        }
        .category-card li {
            color: #555;
            font-size: 14px;
            margin-bottom: 8px;
            padding-left: 20px;
            position: relative;
        }
        .category-card li::before {
            content: "✓";
            color: #2196F3;
            position: absolute;
            left: 0;
            font-weight: bold;
        }
        /* 优势统计卡片 */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
            margin-bottom: 30px;
        }
        .stat-card {
            text-align: center;
            padding: 30px 15px;
            background: #fff;
            border-radius: 10px;
            box-shadow: 0 2px 6px rgba(0,0,0,0.05);
            transition: transform 0.3s ease;
        }
        .stat-card:hover {
            transform: translateY(-6px);
        }
        .stat-value {
            font-size: 48px;
            color: #2196F3;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .stat-label {
            color: #1a237e;
            font-weight: 600;
            font-size: 17px;
            margin-bottom: 8px;
        }
        .stat-desc {
            color: #666;
            font-size: 14px;
            line-height: 1.5;
        }
        /* 可折叠FAQ样式 */
        .faq-container {
            margin-top: 20px;
        }
        .faq-item {
            border: 1px solid #eee;
            border-radius: 8px;
            margin-bottom: 12px;
            overflow: hidden;
            background: #fff;
        }
        .faq-question {
            padding: 18px 20px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            color: #222;
            transition: background 0.2s ease;
            font-size: 15px;
        }
        .faq-question:hover {
            background: #f8f9fa;
        }
        .faq-question::after {
            content: "+";
            font-size: 20px;
            color: #2196F3;
            transition: transform 0.2s ease;
        }
        .faq-question.active::after {
            content: "-";
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 20px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            color: #666;
            font-size: 14px;
        }
        .faq-answer.show {
            padding: 0 20px 25px;
            max-height: 1000px;
        }
        .faq-answer ul, .faq-answer ol {
            margin: 10px 0 0 20px;
            padding: 0;
        }
        .faq-answer li {
            margin-bottom: 8px;
        }
        /* 样品申请模块 */
        .sample-request {
            background: linear-gradient(135deg, #e3f2fd 0%, #f0f8ff 100%);
            padding: 25px;
            border-radius: 10px;
            margin: 30px 0;
            border-left: 5px solid #2196F3;
        }
        .sample-request p {
            margin-bottom: 10px;
        }
        .sample-request .contact-link {
            color: #2196F3;
            text-decoration: none;
            font-weight: 600;
        }
        .sample-request .contact-link:hover {
            text-decoration: underline;
        }
        /* 行业细分模块 */
        .industry-tabs {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 25px;
        }
        .industry-tab {
            padding: 8px 20px;
            background: #e3f2fd;
            color: #2196F3;
            border: none;
            border-radius: 20px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s ease;
        }
        .industry-tab.active {
            background: #2196F3;
            color: #fff;
        }
        /* 响应式适配 */
        @media (max-width: 768px) {
            .main-title {
                font-size: 24px;
            }
            .section-title {
                font-size: 20px;
            }
            .stat-value {
                font-size: 36px;
            }
            .card {
                padding: 20px;
            }
        }
        @media (max-width: 480px) {
            .main-title {
                font-size: 20px;
            }
            .section-title {
                font-size: 18px;
            }
            .stat-card {
                padding: 20px 10px;
            }
            .stat-value {
                font-size: 30px;
            }
        }