@media (max-width: 1199px) {
    /*  表示屏幕宽度小于 1100px 时，内部的 CSS 规则才会生效。 */
    .top, .m-box,.banner-box-1 {
        display:  none;
    }
    .t-center,.logo-center {
        font-size: 12px;
    }
    .m-box-l{
        width:100%;
        flex:0 0 100%;
    }
    h1{
        font-size: 17px;
    }
    .m-box-r{
        width:100%;
        flex:0 0 100%;
    }
    .m-box-r-item{
        max-width: calc(100% / 2 - 20px);
    }
    .index-box{
        padding:20px;
    }
    .title-box,.news-box-item{
        margin-bottom: 20px;
    }
    .news-l{
        margin-bottom: 20px;;
    }
    .box-item-padding{
        padding:15px;
    }
    .news-item-txt{
        flex:1;
        padding-left: 20px;
    }
    .box-item{
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
        margin-bottom: 26px;
        display: flex;
        align-items: flex-start;
        justify-content: flex-start;
    }
    .industry-box-item{
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
        flex:0 0 48%;
        height:168px;
        margin-bottom: 20px;;
    }
    .industry-center{
        display: flex;
        flex-wrap: wrap; /* 允许换行 */
        justify-content: space-between;
    }
    .big-cate-box-item-cycle, .industry-box-item-cycle{
        border-radius: 30px;
        height:60px;
        width:60px;
        font-size: 30px;
    }
    .item-cycle-1{
        color: rgba(1, 185, 245);
    }
    .item-cycle-2{
        color: rgba(103, 194, 58);
    }
    .item-cycle-3{
        color: rgba(246, 190, 30);
    }
    .item-cycle-4{
        color: rgba(245, 108, 108);
    }
    .cate-text{
        margin-top:20px;
        margin-bottom:8px;
    }
    .y-bg1-3{
      background: rgba(1, 185, 245, 0.3);
    }
    .y-bg2-3{
      background: rgba(103, 194, 58, 0.3);
    }
    .y-bg3-3{
      background: rgba(246, 190, 30, 0.3);
    }
    .y-bg4-3{
      background: rgba(245, 108, 108, 0.3);
    }
    .big-cate-box-item{
        flex:0 0 48%;
        height:150px;
        margin-bottom:20px;
    }
    .cate-center{
        display: flex;
        flex-wrap: wrap; /* 允许换行 */
        justify-content: space-between;
    }
    .footer{
        display: none;
    }
    .w80-100{
        width:70px;
    }
}