/* 小屏幕手机端 */
               @media (min-width: 0px) and (max-width:750px) {
                nav {
                    padding: 0 .4rem;
                    box-sizing: border-box;
                }

                main {
                    /* background-color: #F6F8FB; */
                    /* width: 100vw; */
                    /* font-size: 0rem; */
                    /* margin: 0 auto; */
                }

                .headerbox {
                    background: url(../partimage/smokealarm/screentopimg.png);
                    /* width: 100%; */
                    height: 4.6667rem;
                    margin: 0 auto;
                    background-size: 100% 100%;
                    position: relative;
                }

                .topimg {
                    width: 100%;
                    height: 4.6667rem;
                    /* width: 100vw; */
                    position: absolute;
                }

                .header {
                    /* width: 16rem; */
                    z-index: 99;
                }

                .top-content {
                    position: absolute;
                    top: .7067rem;
                    left: .6667rem;
                }

                .top-content h1 {
                    font-family: Alibaba PuHuiTi;
                    font-weight: 500;
                    font-size: .48rem;
                    color: #FFFFFF;
                    /* height: .4667rem;
         line-height: 1.0667rem; */
                }

                .top-content div {
                    width: 1.3333rem;
                    height: .0533rem;
                    background: #F5F2F6;
                    margin: .3333rem 0 .32rem;
                }

                .top-content p {
                    width: 5.0933rem;
                    font-family: Alibaba PuHuiTi;
                    font-weight: 400;
                    font-size: .2133rem;
                    color: #FFFFFF;
                    /* line-height: 1.8; */
                    height: 1.8133rem;
                    line-height: .4rem;
                }

                .smokebox {
                    background: url(../partimage/smokealarm/smbg.png);
                    /* width: 100%; */
                    height: 15.4533rem;
                    margin: 0 auto;
                    background-size: 100% 100%;
                    padding: .6533rem .4rem;
                    box-sizing: border-box;
                }

                .topstar {
                    display: flex;
                    justify-content: center;
                    align-items: center;
                    margin-bottom: .4rem;
                    height: .4rem;
                }

                .topstar h1 {
                    font-family: Alibaba PuHuiTi;
                    font-weight: 500;
                    font-size: .4267rem;
                    color: #333333;
                    margin: 0 .1067rem;
                }

                .topstar img {
                    width: .1867rem;
                    height: .1867rem;
                }

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

                .smokebox   li {
                    width: 4.4667rem;
                    height: 4.2667rem;
                    border: .0133rem solid transparent;
                    border-radius: .1333rem;
                    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: .3333rem .4267rem .4267rem;
                    box-sizing: border-box;
                    margin-right: .2667rem;
                }

                .smokebox   li:nth-child(4) {
                    padding: .3333rem .3067rem .4267rem;
                    box-sizing: border-box;
                }

                .smokebox   li:nth-child(3) {
                    padding: .3333rem .2667rem .4267rem;
                    box-sizing: border-box;
                }

                .smokebox  li:nth-child(-n+4) {
                    margin-bottom: .2667rem;
                }

                .smokebox  li:nth-child(2n) {
                    margin-right: 0rem;
                }

                .smokebox  li img {
                    width: 1.3067rem;
                    height: 1.4533rem;
                }

                .smokebox  li h1 {
                    font-family: Alibaba PuHuiTi;
                    font-weight: 500;
                    font-size: .4rem;
                    color: #333333;
                    margin: .1067rem 0 .16rem;
                }

                .smokebox    li p {
                    font-family: Alibaba PuHuiTi;
                    font-weight: 400;
                    font-size: .2933rem;
                    color: #666666;
                }
                .blue {
                    background: linear-gradient(-86deg, #3D93FD, #29C7FB);
                }
    
                .orange {
                    background: linear-gradient(90deg, #FFB966, #FD7E31);
                }
    
                .green {
                    background: linear-gradient(-90deg, #21E179, #2EF398);
                }
                .particularbox {
                    background-color: #FFFFFF;
                    /* height: 11.6933rem; */
                    padding: .6667rem .4rem;
                    box-sizing: border-box;
                }
    
                .partstar {
                    display: flex;
                    justify-content: center;
                    align-items: center;
                }
    
                .partstar h1 {
                    font-family: Alibaba PuHuiTi;
                    font-weight: 500;
                    font-size: .4267rem;
                    color: #333333;
                }
    
                .partstar img {
                    width: .2667rem;
                    height: .2667rem;
                    margin: 0 .1067rem;
                }
    
                .particular ul {
                    /* display: flex; */
                    margin-top: .4rem;
                }
    
                .particular li:nth-child(-n+2) {
                    margin-bottom: .4rem;
                }
    
                .partbox {
                    width: 9.2rem;
                    /* height: 3.0667rem; */
                    background: #FFFFFF;
                    box-shadow: 0rem .0533rem .12rem 0rem rgba(0, 0, 0, 0.05);
                    border-radius: .2667rem;
                }
    
                .particular li:nth-child(3) .partbox {
                    /* height: 2.6133rem; */
                }
    
    
                .part-top {
                    height: 1.04rem;
                    border-radius: .2667rem .2667rem 0 0;
                    display: flex;
                    align-items: center;
                    justify-content: space-between;
                    padding: .12rem .32rem;
                    box-sizing: border-box;
                }
    
                .part-top p {
                    font-family: Alibaba PuHuiTi;
                    font-weight: 400;
                    font-size: .4rem;
                    color: #FFFFFF;
                    height: .3867rem;
                    line-height: .3867rem;
                }
    
                .particularbox li:nth-child(1) .part-top img {
                    width: .7333rem;
                    height: .7333rem;
                }
    
                .particularbox li:nth-child(2) .part-top img {
                    width: .8293rem;
                    height: .7067rem;
                }
    
                .particularbox li:nth-child(3) .part-top img {
                    width: .6533rem;
                    height: .6667rem;
                }
    
                /* .part-top img {
                    width: .6667rem;
                    height: .64rem;
                } */
    
                .part-top .heng {
                    width: .4267rem;
                    height: .04rem;
                    background: #FFFFFF;
                    margin-top: .0933rem;
                }
    
                .part-bot {
                    display: flex;
                    align-items: flex-start;
                    /* padding-left: .32rem;
                    padding-right: .32rem; */
                    padding: .3067rem .32rem;
                    box-sizing: border-box;
                    /* margin-top: .3067rem; */
                }
    
                .part-bot img {
                    width: .3867rem;
                    height: .3067rem;
                    margin-right: .12rem;
                    margin-top: .0667rem;
                }
    
                .part-bot p {
                    font-family: Alibaba PuHuiTi;
                    font-weight: 400;
                    font-size: .3467rem;
                    color: #333333;
                }
            }