@media (min-width: 751px) {
    .about {
        background-color: #F6F8FB;
    }

    .main {
        display: flex;
        background: #F6F8FB;
    }

    .content {
        flex: 1;
    }

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

    .tab ul {
        cursor: pointer;
    }

    .test {
        height: 62px;
        width: 267px;
        background-color: #FFFFFF;
        display: flex;
        align-items: center;
        justify-content: center;
        font-family: Alibaba PuHuiTi;
        font-weight: 400;
        font-size: 20px;
        color: #333333;
        border: 1px solid #EEEEEE;
        box-sizing: border-box;
        border-collapse: collapse;
        position: relative;
        /* border-left: 2px solid black; */
    }
    :root {
        --border-width: 2px;
      }
    /* .test::after {
        content: '';
        position: absolute;
        top: calc(50% - var(--border-width));
        left: calc(50% - var(--border-width));
        width: calc(100% + 2 * var(--border-width));
        height: calc(100% + 2 * var(--border-width));
        border-left: var(--border-width) solid black;
      } */
  

    .test:nth-last-child(-n+3) {
        margin: -1px 0 0 -1px;
    }
    .selected {
        background: #e2eefb;
        /* opacity: 0.09; */
        color: #195990;
        font-weight: 400;
        font-size: 20px;
    }

    .tab .active::before {
        content: '';
        width: auto;
        width: 4px;
        height: 30px;
        background: #10225A;
        border-radius: 2px;
        display: block;
        position: absolute;
        left: 0;
        top: 16px;
    }
    .first-content {
        position: relative;
    }

    .abstract {
        width: 790px;
        height: 664px;
        background: #10225A;
        opacity: 0.9;
        position: absolute;
        left: 143px;
        top: 39px;
        padding: 35px 37px 45px 37px;
        box-sizing: border-box;
    }

    .abstract .top h1 {
        font-family: Alibaba PuHuiTi;
        font-weight: 400;
        font-size: 30px;
        color: #FFFFFF;
        /* line-height: 26px; */
    }

    .abstract .top .across {
        width: 116px;
        height: 4px;
        background: #F6F8FB;
        margin-top: 8px;
        margin-bottom: 40px;
    }

    .abstract section {
        font-family: Alibaba PuHuiTi;
        font-weight: 400;
        font-size: 16px;
        color: #FFFFFF;
        text-indent: 32px;
        line-height: 30px;
    }

    .marbot {
        margin-bottom: 25px;
    }

    .culture {
        padding: 50px 50px 70px;
        box-sizing: border-box;
    }

    .cutop h1 {
        font-family: Alibaba PuHuiTi;
        font-weight: 400;
        font-size: 30px;
        color: #10225A;
    }

    .cuheng {
        width: 116px;
        height: 4px;
        background: #10225A;
        margin-top: 8px;
    }

    .culture li {
        width: 883px;
        height: 270px;
        background: #FFFFFF;
        box-shadow: 0px 4px 16px 2px rgba(201, 225, 255, 0.28);
        border-radius: 10px;
        margin-top: 40px;
        padding: 30px 19px 0 32px;
        box-sizing: border-box;
        position: relative;
    }

    .culture li h1 {
        font-family: Alibaba PuHuiTi;
        font-weight: 400;
        font-size: 40px;
        color: #10225A;
        line-height: 35px;
    }

    .contop p {
        font-family: Alibaba PuHuiTi;
        font-weight: 400;
        font-size: 20px;
        color: #999999;
        margin-top: 18px;
    }

    .culture li img {
        position: absolute;
        right: 19px;
        bottom: 0;
    }

    .txetbot {
        margin-top: 30px;
    }

    .txetbot p {
        font-family: Alibaba PuHuiTi;
        font-weight: 400;
        font-size: 20px;
        color: #333333;
    }

    .culture li:nth-child(2) .txetbot p {
        width: 640px;
    }

    .culture li:nth-child(3) .txetbot p {
        width: 662px;
    }

    .development {
        padding: 50px 0 70px 50px;
        box-sizing: border-box;
    }

    .mainimg {
        width: 20px;
        height: 1091px;
        margin: 0 20px;
    }

    .devbox {
        display: flex;
    }

    .devbox h1 {
        font-family: Alibaba PuHuiTi;
        font-weight: 500;
        font-size: 20px;
        color: #333333;
    }

    .devbox p {
        font-family: Alibaba PuHuiTi;
        font-weight: 400;
        font-size: 16px;
        color: #666666;
    }

    /* .devbox .left p {
        width: 351px;
    } */
    .devbox .left .leftbox:nth-of-type(1) p {
        width: 336px;
        height: 62px;
    }

    .devbox .left .leftbox:nth-of-type(2) p {
        width: 336px;
    }

    .devbox .left .leftbox:nth-of-type(3) p {
        width: 336px;
    }

    .devbox .left .leftbox:nth-of-type(4) p {
        width: 352px;
    }

    .devbox .left .leftbox:nth-of-type(5) p {
        width: 135px;
    }

    .devbox .left h1 {
        /* margin-top: 76px; */
        display: flex;
        justify-content: end;
        height: 19px;
    }

    .devbox .left .circle {
        margin-top: 9px;
    }

    .devbox .leftbox {
        margin-top: 105px;
        display: flex;
        align-items: flex-start;
        justify-content: end;
    }

    .devbox .leftbox:nth-child(1) {
        margin-top: 110px;
    }
 
    .left h1:nth-of-type(1){
        margin-top: 54px;
    }
    .left h1:nth-of-type(2),.left h1:nth-of-type(4){
        margin-top: 68px;
    }
    .left h1:nth-of-type(3){
        margin-top: 68px;
    }

    .yi {
        text-align: right;
        margin-right: -5px;
    }

    .cirleft {
        margin-left: 8px;
    }

    #end {
        margin-top: 105px;
    }
  
    .devbox .rightbox {
        display: flex;
        align-items: center;
    }
    .devbox .rightbox:nth-of-type(1) .circle {
        margin-top: -46px;
    }
    .devbox .rightbox .circle {
        margin-right: 8px;
    }
    .devbox .rightbox:nth-of-type(1){
        margin-top: 93px;
    }
    .devbox .rightbox:nth-of-type(2){
        margin-top: 93px;
    }
    .devbox .rightbox:nth-of-type(3){
        margin-top: 93px;
    }
    .devbox .rightbox:nth-of-type(4){
        margin-top: 94px;
    }
    .devbox h1:nth-child(1) {
        margin-top: 106px;
    }
    .right h1:nth-of-type(2){
        margin-top: 45px;
    }
    .right h1:nth-of-type(3){
        margin-top: 69px;
    }
    .right h1:nth-of-type(4){
        margin-top: 93px;
    }
    .right h1:nth-of-type(5){
        margin-top: 93px;
    }
    .right p {
        width: 392px;
    }
    /* 两行的 */
    .right .rightbox:nth-of-type(2) {
        display: block;
    }

    .right .rightbox:nth-of-type(2) .inner {
        display: flex;
        align-items: center;
    }

    .right .rightbox:nth-of-type(2) .inner .circle {
        margin-right: 8px;
    }

    .leftbox {
        display: flex;
        /* align-items: start; */
    }


    .circle {
        width: 6px;
        height: 6px;
        background: #CCCCCC;
        border-radius: 50%;
    }

    .honor {
        padding: 50px 0px 50px 50px;
        box-sizing: border-box;
    }

    .honor ul {
        width: 884px;
        display: flex;
        flex-wrap: wrap;
    }

    .honoeheng {
        margin-bottom: 31px;
    }

    .honor li {
        position: relative;
        width: 280px;
        height: 406px;
        margin-right: 22px;
        margin-bottom: 22px;
    }
    .honor li img {
        width: 100%;
        height: 100%;
    }
    .honor li:nth-last-of-type(-n+3) {
        margin-bottom: 0;
    }

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

    .honor li p {
        /* width: 280px; */
        display: flex;
        justify-content: center;
        /* position: absolute; 
        bottom: 21px;
        left: 50%;  */
        margin-top: -42px;
        font-family: Alibaba PuHuiTi;
        font-weight: 400;
        font-size: 16px;
        color: #333333;
    }

    /* .first-content,
    .second-content,
    .third-content,
    .fourth-content {
        display: none;
    }

    .first-content {
        display: block;
    } */
}