.aBg{
    padding: .6rem 0;
    overflow: hidden;
}
.a1Box{
    margin: .4rem 0;
}
.a1Left{
    width: 54%;
    max-width: 840px;
}
.a1Text{
    line-height: 2;
    margin-top: .5rem;
    text-align: justify;
}
.a1Right{
    width: 42%;
    max-width: 640px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.videoImg{
    position: relative;
    height: 0;
    padding-bottom: 68.75%;
    padding-bottom: 56.2%;
}
.videoImg video,
.videoImg img{
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.videoPlay{
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: url(https://www.mstnchina.com/images/play.webp) center center no-repeat;
    background-size: 7.5% auto;
    z-index: 1;
    cursor: pointer;
}
.videoImg img{
    z-index: 1;
    cursor: pointer;
}
.a1List{
    line-height: 1.5;
    margin: .4rem 0;
}
.a1List li{
    width: 25%;
    padding: .3rem;
    background-color: #FAFAFA;
    transition: all .3s;
}
.a1List li:nth-child(2n){
    background-color: #F5F5F5;
}
.a1Ico{
    width: 36px;
    height: 36px;
    max-width: .44rem;
    max-height: .44rem;
    margin: 0 auto .1rem;
}
.a1Ico img{
    width: 100%;
    height: 100%;
    object-fit: contain;
}
.a1Num{
    vertical-align: middle;
}
.a1Num strong{
    vertical-align: baseline;
    margin-right: 5px;
}
.a1List li:hover{
    position: relative;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
}

.aBg2{
    background-color: #F7F7F7;
}
.a2List{
    perspective: 1000px;
    /* perspective: 600px; */
    margin: 0 -.1rem;
}
.a2List li{
    width: 25%;
    padding: 0 .1rem;
}
.a2List li:nth-child(1){
    transform: translateX(20px) translateZ(0px) scaleX(0.8) rotateY(30deg);
}
.a2List li:nth-child(2){
    transform: translateX(-10px) translateZ(-150px) scaleX(1.1) rotateY(20deg);
}
.a2List li:nth-child(3){
    transform: translateX(10px) translateZ(-150px) scaleX(1.1) rotateY(-20deg);
}
.a2List li:nth-child(4){
    transform: translateX(-20px) translateZ(0px) scaleX(0.8) rotateY(-30deg);
}
.a2Img{
    display: block;
    position: relative;
    height: 0;
    padding-bottom: 135%;
    border-radius: .15rem;
    overflow: hidden;
}
.a2Img img{
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%; 
    object-fit: cover;
    transition: all 1s;
}
.a2Img:hover img{
    transform: scale(1.05);
}
.a2Mask{
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: #000000;
    opacity: .4;
}
.a2Text{
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    line-height: 1.5;
}
.a2Shadow{
    width: 240px;
    max-width: 65%;
    height: 10px;
    max-height: .1rem;
    border-radius: 100%;
    background: #000000;
    opacity: 0.1;
    filter: blur(5px);
    margin: 0 auto;
    margin-top: .3rem;
}
.aBg3 .hm4Item{
    background-color: #F7F7F7;
}
.aBg3 .hm4Item:hover{
    background-color: rgba(246, 173, 27, 0.8);
}
.aBg4{
    background: url(https://www.mstnchina.com/images/about/aBg4.webp) left bottom #F7F7F7 no-repeat;
    background-size: cover;
}
.a4Box{

}
.a4Left{
    flex: auto;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}
.a4Left .boxTit{
    margin: .4rem 0;
}
.a4Dot{
    position: relative;
    line-height: 1.8;
    padding: .1rem .2rem;
    margin: 1.8rem 0;
    font-weight: bold;
    z-index: 1;
}
.a4Dot::after{
    display: block;
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    width: 180%;
    height: 100%;    
    background: linear-gradient(-90deg, rgba(255,255,255,0) 0%, #FFFFFF 100%);
    z-index: -1;
}
.a4Dot li{
    padding: .2rem .1rem;
}
.a4Dot li img{
    display: block;
    width: 30px;
    height: 30px;
    object-fit: contain;
    max-width: .4rem;
    max-height: .4rem;
    margin: 5px auto 0;
}
.a4Right{
    position: relative;
    flex-shrink: 0;
    width: 72.5%;
    text-align: right;
    z-index: 2;
}
.a4Right img{
    max-width: 100%;
    height: auto;
}

/* leader */
.leaderBox{

}
.leaderLeft{
    flex: auto;
    overflow: hidden;
}
.leaderTit{
    position: relative;
    line-height: 1.2;
    margin: 0 0 .4rem;
    padding-left: .3rem;
    text-align: justify;
}
.leaderTit::before{
    display: block;
    content: "";
    width: .12rem;
    height: 90%;
    position: absolute;
    left: 0;
    top: 5%;
    background-color: var(--baseColor);
}
.leaderTit h3{
    line-height: 1.2;
    margin-bottom: .1rem;
}
.leaderText{
    max-height: 5.4rem;
    margin: .4rem 0;
    overflow-y: auto;
    padding-right: 15px;
    text-align: justify;
}
.leaderText::-webkit-scrollbar{
    width: 4px;
    height: 4px;
    background-color: rgba(0, 0, 0, 0.05);
}
.leaderText::-webkit-scrollbar-thumb{
    background-color: var(--baseColor);
}
.leaderName img{
    width: auto;
    height: 19px;
    max-height: .28rem;
    height: 50px;
    max-height: .8rem;
}
.leaderRight{
    flex-shrink: 0;
    width: 43.75%;
    max-width: 700px;
    margin-left: 6.25%;
}
.leaderRight img{
    width: 100%;
    height: auto;
}

/* strategy */
.strategyList{
    list-style: none;
    line-height: 1.5;
    margin: .3rem 0 0;
}
.strategyList li{
    display: flex;
    background-color: #F7F7F7;
}
.strategyList li:nth-child(2n){
    flex-direction: row-reverse;
}
.strategyImg,
.strategyText{
    flex-shrink: 0;
    width: 50%;
    overflow: hidden;
}
.strategyImg img{
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: all 1s;
}
.strategyText{
    padding: .5rem .3rem .3rem;
    padding-left: 10%;
}
.strategyTit{
    position: relative;
    line-height: 1.2;
    margin: .2rem 0;
}
.strategyTit::before{
    display: block;
    content: "";
    position: absolute;
    left: -.3rem;
    top: 0;
    width: 10px;
    height: 100%;
    max-width: .1rem;
    background: #F6AD1B;
}
.strategyCon p{
    position: relative;
    padding-left: 25px;
}
.strategyCon p::before {
    display: block;
    content: "▲";
    color: var(--redColor);
    position: absolute;
    left: 0px;
    top: 0px;
}
.strategyList li:hover .strategyImg img{
    transform: scale(1.05);
}

/* history */
.historyBg{
    padding: .8rem 0 .3rem;
    background: url(https://www.mstnchina.com/images/about/historyBg.webp) center bottom no-repeat;
    background-size: 100% auto;
}
.history{
    position: relative;
    padding: 100px 0 0;
}
.hisImg{
    position: relative;
}
.hisImg img{
    width: 100%;
    height: auto;
}
.hisYear{
    color: #8A8D90;
    line-height: 1.4;
}
.hisYear li{
    position: absolute;
    cursor: pointer;
}
.hisYear .year{
    position: absolute;
    white-space: nowrap;
    left: 50%;
    transform: translateX(-50%);
    bottom: 100%;
    transition: all .3s;
}
.hisYear .dot{
    display: block;
    width: 40px;
    height: 40px;
    background: url(https://www.mstnchina.com/images/about/hisDot1.webp) center center no-repeat;
    background-size: contain;
}
.hisYear li.active .year{
    font-size: 130%;
    color: var(--baseColor);
    font-weight: bold;
}
.hisYear li.active .dot{
    background-image: url(https://www.mstnchina.com/images/about/hisDot2.webp);
}
.hisLi1{
    left: 0;
    bottom: 7.7%;
}
.hisLi2{
    left: 14.56%;
    bottom: 17.23%;
}
.hisLi3{
    left: 29.19%;
    bottom: 18.9%;
}
.hisLi4{
    left: 41.75%;
    bottom: 47.2%;
}
.hisLi5{
    left: 55.87%;
    bottom: 46.74%;
}
.hisLi6{
    left: 66.25%;
    bottom: 63.82%;
}
.hisLi7{
    left: 81.13%;
    bottom: 71.18%;
}
.hisLi8{
    left: 94.8%;
    bottom: 93.17%;
}
.hisList{
    position: absolute;
    left: 0;
    top: 0;
    width: 42%;
    max-width: 660px;
}
.hisList .year{
    line-height: 1.2;
    margin-bottom: .2rem;
}
.hisList .box{
    position: relative;
    padding: .1rem;
}
.hisList .box::before,
.hisList .box::after{
    position: absolute;
    display: block;
    content: '';
    width: .3rem;
    height: .3rem;
    border: 2px solid var(--baseColor);
}
.hisList .box::before{
    left: 0;
    top: 0;
    border-right: none;
    border-bottom: none;
}
.hisList .box::after{
    right: 0;
    bottom: 0;
    border-left: none;
    border-top: none;
}
.hisList .content{
    padding: .1rem;
    background-color: #F7F7F7;
}
.hisList .content h3{
    font-size: 140%;
    margin: .1rem 0;
    font-weight: bold;
}
.hisList .content p{
    position: relative;
    line-height: 25px;
    margin: .15rem 0;
    padding-left: 20px;
}
.hisList .content p::before{
    display: block;
    content: "";
    position: absolute;
    left: 0;
    top: 6px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--baseColor);
}
.hisList .content .scroll{
    max-height: 185px;
    padding: 0 .2rem;
    overflow-y: auto;
}
.hisList .content .scroll::-webkit-scrollbar{
    width: 4px;
    height: 4px;
    border-radius: 2px;
    background-color: rgba(0, 0, 0, 0.05);
}
.hisList .content .scroll::-webkit-scrollbar-thumb{
    border-radius: 2px;
    background-color: var(--baseColor);
}
.hisList .swiper-pagination{
    display: none;
}
/* honor */
.honorBg{
    min-height: 50vh;
    background-color: #F8F8F8;
}
.honTab{
    width: 800px;
    max-width: 50%;
    margin: .1rem 0 .4rem;
    margin-left: auto;
}
.honTab li{
    padding: 0 .2rem;
}
.honTab li:first-child{
    padding-left: 0;
}
.honTab li:last-child{
    padding-right: 0;
}
.honTab li span{
    display: block;
    min-width: 1.4rem;
    line-height: 28px;
    padding: .1rem .3rem;
    background: #FFFFFF;
    border-radius: 0px 24px 24px 24px;
    text-align: center;
    cursor: pointer;
    transition: all .3s;
}
.honTab li.active span{
    color: #FFFFFF;
    background-color: var(--baseColor);
}
.honBox{
    margin: .4rem 0 1rem;
}
.honBox .boxTit{
    flex: auto;
    overflow: hidden;
}
.honText{
    width: 800px;
    max-width: 50%;
    line-height: 1.5;
    margin-left: 5%;
}
.honBot{
    margin: 0 -.13rem;
}
.honList:nth-child(4n - 1){
    justify-content: flex-end;
}
.honItem{
    width: 16.7%;
    padding: 0 .13rem;
}
.honImg img{
    width: 100%;
    height: auto;
}
.honLine{
    position: relative;
    width: calc(83.5% - 1rem);
    height: .72rem;
    margin-top: .1rem;
    margin-bottom: .28rem;
    background: url(https://www.mstnchina.com/images/about/honLine.png) left top repeat;
    background-size: auto 100%;
}
.honLine::before{
    display: block;
    content: "";
    width: 1rem;
    height: 100%;
    background: url(https://www.mstnchina.com/images/about/honArrow.png) right top no-repeat;
    background-size: 100% 100%;
    position: absolute;
    left: 100%;
    top: 0;
}
.honLine::after{
    display: block;
    content: "";
    width: 100vw;
    height: 100%;
    background: url(https://www.mstnchina.com/images/about/honLine.png) left top repeat;
    background-size: auto 100%;
    position: absolute;
    right: 100%;
    top: 0;
}
.honLine:nth-child(4n){
    margin-left: auto;
}
.honLine:nth-child(4n)::before{
    left: auto;
    right: 100%;
    transform: scaleX(-1);
}
.honLine:nth-child(4n)::after{
    right: auto;
    left: 100%;
}

.culItem{
    position: relative;
    overflow: hidden;
}
.culImg img{
    width: 100%;
    height: auto;
}
.culText{
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    padding: .8rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.culCon{
    margin-top: .3rem;
}
.culItem:nth-child(2n) .culText{
    align-items: flex-end;
    animation-name: fadeInRight;
}
.culItem:nth-child(2n) .boxLine{
    margin-left: auto;
}
.culItem + .culItem{
    margin-top: -.4rem;
}


@media (max-width:1600px){

}
@media (max-width:1400px){

}
@media (max-width:1200px){
    .a1Box{
        display: block;
        margin-top: 0;
    }
    .a1Left,
    .a1Right{
        width: 100%;
        max-width: 100%;
    }
    .a1Text{
        margin: .3rem 0;
    }
    .a1List{
        margin-bottom: 0;
    }
    .a4Box{
        display: block;
    }
    .a4Left .boxTit{
        margin: 0;
    }
    .a4Dot{
        margin: .2rem 0;
    }
    .a4Right{
        width: 100%;
    }

    .leaderBox{
        flex-direction: column-reverse;
    }
    .leaderTit::before{
        max-width: 8px;
    }
    .leaderText{
        max-height: none;
    }
    .leaderRight{
        width: 100%;
        margin: 0 auto .3rem;
    }
    .strategyList{
        line-height: 1.8;
    }
    .strategyText{
        padding: .3rem;
        padding-left: .6rem;
    }
    .strategyTit{
        margin-top: 0;
    }
    .strategyTit::before{
        width: 6px;
        max-width: .08rem;
        left: -.2rem;
    }
    .history{
        padding: .3rem 0 0;
    }
    .hisImg{
        display: none;
    }
    .hisList{
        position: static;
        width: 100%;
        max-width: 100%;
    }
    .hisList .content .scroll{
        max-height: none;
    }
    .hisList .swiper-pagination{
        display: block;
    }

    .honTab{
        width: 100%;
        max-width: 100%;
        justify-content: center;
    }
    .honBox{
        display: block;
        margin: .3rem 0 .5rem;
    }
    .honText{
        width: 100%;
        max-width: 100%;
        margin: .3rem 0;
    }
    .honItem{
        width: 22%;
    }
    .honLine{
        width: calc(calc(88% - 1rem));
        max-height: 40px;
    }
    .culItem + .culItem{
        margin-top: -.2rem;
    }
    .culText{
        padding: .3rem 5%;
    }
    .culCon{
        margin-top: .2rem;
    }
}
@media (max-width:991px){
    .a1List{
        flex-wrap: wrap;
    }
    .a1List li{
        width: 50%;
    }
    
    .a1List li:nth-child(4n){
        background-color: #FAFAFA;
    }
    .a1List li:nth-child(4n - 1){
        background-color: #F5F5F5;
    }
    .a2List{
        flex-wrap: wrap;
        margin-top: .3rem;
    }
    .a2List li{
        transform: none !important;
        margin-top: .2rem;
    }
    .a2Shadow{
        margin-top: .1rem;
    }
    .strategyList li{
        display: block;
    }
    .strategyImg,
    .strategyText{
        width: 100%;
    }
    .strategyText{
        padding-left: .4rem;
    }

}
@media (max-width:767px){
    .a2List li{
        width: 50%;
    }
    .honItem{
        width: 30%;
    }

}
@media (max-width:640px){

}
@media (max-width:460px){
    .hisList .year{
        font-size: 18px;
    }
    .hisList .content p{
        padding-left: 15px;
    }
    .hisList .content p::before{
        width: 8px;
        height: 8px;
        top: 8px;
    }
    .honItem{
        width: 45%;
    }
    .culCon{
        font-size: 14px;
    }

}