/* 大屏幕（大桌面显示器，大于等于 1200px） */
       @media (min-width: 751px) {
        main {
            /* background-color: #F6F8FB; */
            /* width: 100vw; */
            /* font-size: 0px; */
            /* margin: 0 auto; */
        }

        .w {
            width: 1200px;
            margin: 0 auto;
        }

        .headerbox {
            background: url(../partimage/smokealarm/topimg.png);
            /* width: 100%; */
            min-width: 1200px;
            height: 474px;
            margin: 0 auto;
            background-size: 100% 100%;
            position: relative;
        }

        .topimg {
            width: 100%;
            height: 474px;
            /* width: 100vw; */
            position: absolute;
            object-fit: cover;
        }

        .header {
            min-width: 1200px;
            /* width: 1200px; */
            z-index: 99;
        }

        .top-content {
            position: absolute;
            top: 119px;
            /* left: 360px; */
        }

        .top-content h1 {
            font-family: Alibaba PuHuiTi;
            font-weight: 500;
            font-size: 36px;
            color: #FFFFFF;
            /* height: 35px;
         line-height: 80px; */
        }

        .top-content div {
            width: 100px;
            height: 4px;
            background: #F5F2F6;
            margin: 36px 0 30px;
            /* margin: 34px 0; */
        }

        .top-content p {
            width: 534px;
            font-family: Alibaba PuHuiTi;
            font-weight: 400;
            font-size: 16px;
            color: #FFFFFF;
            /* line-height: 1.8; */
            height: 76px;
            line-height: 30px;
        }

        .smokebox {
            background: url(../partimage/milk/bg.png);
            /* width: 100%; */
            min-width: 1200px;
            height: 786px;
            margin: 0 auto;
            background-size: 100% 100%;
            padding: 70px 0;
            box-sizing: border-box;
        }

        .topstar {
            display: flex;
            justify-content: center;
            align-items: center;
            margin-bottom: 50px;
            height: 26px;
        }

        .topstar h1 {
            font-family: Alibaba PuHuiTi;
            font-weight: 400;
            font-size: 28px;
            color: #333333;
            margin: 0 8px;
        }

        .topstar img {
            width: 14px;
            height: 14px;
        }

        .smokebox  ul {
            display: flex;
            flex-wrap: wrap;
        }

        .smokebox   li {
            display: flex;
            /* justify-content: center; */
            flex-direction: column;
            align-items: center;
            width: 380px;
            height: 270px;
            border: 1px solid transparent;
            border-radius: 10px;
            background-clip: padding-box, border-box;
            background-origin: padding-box, border-box;
            background-image: linear-gradient(-90deg, #EEF9FF, #F4F9FD), linear-gradient(0deg, #FFFFFF, #E9F6FD);
            text-align: center;
            padding: 25px 37px 32px;
            box-sizing: border-box;
            margin-right: 30px;
        }

      .smokebox  li:nth-child(-n+3) {
            margin-bottom: 30px;
        }

        .smokebox   li:nth-child(3n) {
            margin-right: 0;
        }

        .smokebox   li img {
            width: 98px;
            height: 109px;
        }

        .smokebox  li h1 {
            font-family: Alibaba PuHuiTi;
            font-weight: 400;
            font-size: 22px;
            color: #333333;
            margin: 20px 0 15px;
        }

        .smokebox  li p {
            font-family: Alibaba PuHuiTi;
            font-weight: 400;
            font-size: 16px;
            color: #666666;
        }
        .blue {
            background: linear-gradient(-86deg, #3D93FD, #29C7FB);
        }

        .orange {
            background: linear-gradient(90deg, #FFB966, #FD7E31);
        }

        .green {
            background: linear-gradient(-90deg, #21E179, #2EF398);
        }
        .particularbox {
            min-width: 1200px;
            background-color: #FFFFFF;
            height: 334px;
            padding: 70px 0 70px;
            box-sizing: border-box;
        }

        .particular .partstar {
            display: flex;
            justify-content: center;
            align-items: center;
            line-height: 26px;
        }

        .particular .partstar h1 {
            font-family: Alibaba PuHuiTi;
            font-weight: 400;
            font-size: 28px;
            color: #333333;
        }

        .particular .partstar img {
            margin: 0 8px;
        }

        .particular ul {
            display: flex;
            margin-top: 40px;
        }

        .particular li:nth-child(-n+3) {
            margin-right: 20px;
        }
        /* .particular li:nth-child(3) .partbox {
            height: 158px;
        } */
        .partbox {
            width: 380px;
            /* height: 152px; */
            background: #FFFFFF;
            box-shadow: 0px 4px 9px 0px rgba(0, 0, 0, 0.05);
            border-radius: 10px;
        }

        .part-top {
            height: 50px;
            border-radius: 10px 10px 0px 0px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 9px 19px 8px;
            box-sizing: border-box;
        }

        .part-top p {
            font-family: Alibaba PuHuiTi;
            font-weight: 400;
            font-size: 24px;
            color: #FFFFFF;
            height: 23px;
            line-height: 23px;
        }

        .part-top .heng {
            width: 25px;
            height: 3px;
            background: #FFFFFF;
            margin-top: 5px;
        }

        /* .part-bot {
            display: flex;
            align-items: flex-start;
            padding-left: 10px;
            padding-right: 25px;
            box-sizing: border-box;
            margin-top: 23px;
        } */
        .part-bot {
            display: flex;
            align-items: flex-start;
            /* padding-left: .32rem;
            padding-right: .3333rem; */
            /* padding: 20px 24px 19px 19px; */
            padding: 18px 18px 16px 18px;
            box-sizing: border-box;
            /* margin-top: .3067rem; */
        }

        .part-bot img {
            width: 17px;
            height: 13px;
            margin-right: 7px;
            margin-top: 5px;
        }

        .part-bot p {
            font-family: Alibaba PuHuiTi;
            font-weight: 400;
            font-size: 16px;
            color: #333333;
        }
       
    }