* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: Arial, sans-serif;
        }
        body {
            background-color: #f5f5f5;
            padding: 30px 0;
        }
        /* 整体宽度缩窄 */
        .container {
            width: 880px;
            margin: 0 auto;
            background: #fff;
            padding: 35px;
        }
        /* 主标题方框 */
        .main-title {
            font-size: 24px;
            font-weight: bold;
            color: #0052cc;
            text-align: center;
            border: 2px solid #0052cc;
            padding: 18px;
            margin-bottom: 25px;
            background-color: #fff9e6;
        }
        /* 二级标题方框 */
        .sub-title {
            font-size: 18px;
            font-weight: bold;
            color: #0052cc;
            border: 2px solid #0052cc;
            padding: 10px 15px;
            margin: 30px 0 20px;
            background-color: #fff9e6;
        }
        /* 正文 */
        .text {
            font-size: 15px;
            line-height: 1.8;
            color: #333;
            margin-bottom: 20px;
            text-align: justify;
        }
        /* 第三段双栏等分 */
        .two-box {
            display: flex;
            gap: 20px;
            margin: 20px 0;
        }
        .txt-box, .img-box {
            width: 50%;
            border: 2px solid #0052cc;
            padding: 20px;
        }
        .img-box {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        /* 这里放大图片 */
        .img-box img {
            max-width: 95%;
            height: auto;
        }
        /* 表格 */
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 25px 0;
            font-size: 14px;
        }
        th {
            background: #0052cc;
            color: #fff;
            padding: 12px;
            border: 1px solid #999;
        }
        td {
            padding: 10px;
            border: 1px solid #999;
            text-align: center;
            vertical-align: middle;
        }
        /* 四个系列不同颜色 */
        .s1 { background: #e6f2ff; }
        .s2 { background: #fff9e6; }
        .s3 { background: #e6ffe6; }
        .s4 { background: #ffe6f2; }
        /* 最后一段正文方框 */
        .final-text {
            border: 2px solid #0052cc;
            padding: 22px;
            margin: 30px 0;
            line-height: 1.8;
            font-size: 15px;
        }
        /* 联系方式方框 */
        .contact-box {
            border: 2px solid #0052cc;
            padding: 22px;
            font-size: 14px;
            line-height: 1.8;
            background-color: #fcfcfc;
        }
        .tech-list {
            padding-left: 22px;
            line-height: 1.8;
            margin: 15px 0;
        }