.introduce{
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    overflow: hidden;
}
.introduce .bg{
    position: absolute;
    top: 0;
    right: 0;
    display: block;
    width: 100%;
    /*height: 100vh;*/
    z-index: 0;
}
.introduce .content{
    z-index: 1;
    color: #fff;
}
.exchange{
    width: 100%;
    padding-top: 87px;
    padding-bottom: 87px;
}
.exchange .item{
    display: flex;
    justify-content: center;
    align-items: center;
    color: #FFFFFF;
}
.exchange .item+.item{
    margin-top: 87px;
}
.exchange .item .left{
    width: 666px;
    min-height: 450px;
    background: rgba(0, 0, 0, 0.35);
    padding: 32px 100px 32px 20px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}
.exchange .item .left img{
    width: 80px;
}
.exchange .item .left>div:nth-of-type(2){
    margin-top: 20px;
    display: flex;
    flex-direction: column;
}
.exchange .item .left>div:nth-of-type(2)>span:first-of-type{
    font-size: 34px;
}
.exchange .item .left>div:nth-of-type(2)>span:last-of-type{
    font-size: 20px;
    margin-top: 5px;
}
.exchange .item .left>div:last-of-type{
    font-size: 14px;
    line-height: 25.2px;
    color: rgba(255, 255, 255, 0.8);
}
.exchange .item .right{
    width: 628px;
    height: 368px;
    margin-left: -80px;
    z-index: 2;
}
.exchange .item .right img{
    width: 100%;
    height: 100%;
}
.exchange .item:nth-child(2n){
    flex-direction: row-reverse;
}
.exchange .item:nth-child(2n) .right{
    margin-left: 0;
    margin-right: -80px;
}
.exchange .item:nth-child(2n) .left{
    padding: 32px 20px 32px 100px;
    align-items: end;
}
.exchange .item:nth-child(2n) .left>div:nth-of-type(2){
    text-align: right;
}

.phone .introduce{
    max-height: 1200px;
}