body{
    margin: 0;
    padding: 0;
    font-family: Source Han Sans;
    min-width: 920px;
}
.top{
    display: flex;
    height: 66px;
    align-items: center;
    padding: 0 90px;
    justify-content: space-between;
    font-size: 16px;
}
.logo-box{
    font-weight: bold; 
}
.top .logo{
    width: 32px;
    height: 32px;
    vertical-align: middle;
    margin-right: 13px;
    margin-top: -3px;
}
.page-item{
    display: inline-block;
    width: 140px;
    text-align: center;
    cursor: pointer;
    font-weight: normal;
    color: #3A3A3A;
    text-decoration: none;
}
.page-item.active{
    color: #3A6FF8;
}
.banner{
    height: calc(100vh - 66px);
    background-image: url(../img/bg.png);
    background-size: cover;
    background-repeat: no-repeat;
}
.banner-box{
    margin: 0 auto;
    max-width: 900px;
    height: 660px;
    box-sizing: border-box;
    padding-top: 160px;
    background-image: url(../img/banner-bg.png);
    background-size: 400px 400px;
    background-repeat: no-repeat;
    background-position-x: right;
    background-position-y: 150px;
    color: #fff;
    font-size: 32px;
    font-weight: 500;
}
.banner-box.logo{
    width: 120px;
    height: 120px;
    
}
.banner-box .title{
    font-size: 46px;
    font-weight: bold;
    margin: 15px 0 30px;
}

.about-us{
    height: 220px;
    line-height: 220px;
    text-align: center;
    font-size: 64px;
    font-weight: bold;
    background-image: url(../img/about-bg.png);
    color: #fff;
    background-size: cover;
}
.Welcome{
    font-size: 36px;
    font-weight: 500;
    text-align: center;
    padding: 24px 0 60px;
}
.Welcome span{
   color: #3A6FF8; 
}
.about-banner{
    margin: 0 auto;
    max-width: 900px;
    position: relative;
    box-sizing: border-box;
    padding-left: 420px;
    color: #3D3D3D;
    font-size: 16px;
    padding-bottom: 30px;
}
.about-banner img{
    position: absolute;
    left: 0;
    top: 5px;
    width: 380px;
}

.privacy-banner{
    margin: 20px auto;
    max-width: 900px;
    color: #3D3D3D;
}
.key{
    font-weight: bolder;
}