html, body {
    position: relative;
    height: 100%;
}
header{
    box-shadow: 0px 2px 5px 0px rgba(0, 0, 0, 0.06);
}
.swiper-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}
.swiper-slide {
    text-align: center;
    display: -webkit-box;
    display: -ms-fslexbox;
    display: -webkit-flex;
    display: flex;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    -webkit-justify-content: center;
    justify-content: center;
    -webkit-box-align: center;
    -ms-flex-align: center;
    -webkit-align-items: center;
    align-items: center;
}

section{
    width: 100%;
	min-width: 1200px;
}
section .min{
	width: 1200px;
	margin:auto;
}
section .li{
    position: relative;
    width: 100%;
    height: 100vh;
}
section .li img.bg{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}
section .li .min{
    position: relative;
}
section  .txt.bai{
    color: #fff;
}
section  .txt b{
    display: block;
    font-size: 60px;
    line-height: 70px;
    margin-bottom: 50px;
    text-align: left;
}
section  .txt.cen b{
    text-align: center;
}
section  .txt p{
    text-align: justify;
    font-size: 16px;
    line-height: 30px;
}
section  .txt a{
    position: relative;
    display: block;
    width: 150px;
    height: 40px;
    line-height: 42px;
    padding: 0 30px;
    font-size: 14px;
    font-weight: 500;
    margin-top: 80px;
    color: #fff;
    background: #1D407E;
    text-align: left;
}
section  .txt a.bai{
    background: #fff;
    color: #1D407E;
}
section  .txt a:after{
    position: absolute;
    right: 30px;
    top: 50%;
    margin-top: -5px;
    display: block;
    content:'';
    width: 7px;
    height: 10px;
    background: url('../images/2021en-arrow1.png') no-repeat;
    background-size: 100% 100%;
}
section  .txt a.bai:after{
    background: url('../images/2021en-arrow2.png') no-repeat;
    background-size: 100% 100%;
}
section  .txt.cen a{
    margin:80px auto 0;
}

.box7 footer{
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
}
section .box7.li img.bg{
    height: calc(100vh - 60px);
}
.box2 .limg{
    position: absolute;
    bottom: 0;
    left: 78px;
    max-width: 100%;
    max-height: 80%;
}
.box2 .rimg{
    position: absolute;
    top: 142px;
    right: 16px;
    max-width: 100%;
}
.box2 .min div{
    margin-left: 600px;
}
.box2 .min div b{
    text-align: right;
}
.box2 .min div a{
    margin-left: 450px;
}
.box4 .min div{
    background:#1D407E;
    margin-left: 500px;
    height: 632px;
    padding: 100px 50px;
}
.box4 .limg{
    position: absolute;
    left: 0;
    top:calc(50vh - 40px - 397px + 80px);
}
.box6 .limg{
    position: absolute;
    top:calc(50vh - 40px - 234px + 80px);
    left: 0;
    max-width: 100%;
    z-index: 99;
}
.box6 .min div{
    margin-left: 600px;
    margin-top: calc(50vh - 40px - 234px + 80px);
}
.box4 .min{
    margin-top: calc(50vh - 40px - 316px + 80px);
}
.box1 .min{
    padding-top: calc(50vh - 180px);
}
.box2 .min{
    padding-top: calc(50vh - 230px);
}
.box3 .min{
    padding-top: calc(50vh - 190px);
}
.box5 .min{
    padding-top: calc(50vh - 190px);
}
.box7 .min{
    padding-top: calc(50vh - 300px);
}
@media only screen and (max-width: 1700px){
    section  .txt b{
        font-size: 40px;
        line-height: 60px;
        margin-bottom: 35px;
    }
    section  .txt p{
        font-size: 14px;
    }
    section  .txt a{
        width: 150px;
        height: 40px;
        font-size: 13px;
        margin-top: 60px;
    }
    .box2 .rimg{
        top: 100px;
        max-width: 50%;
    }
    .box4 .min div{
        height: 480px;
        padding: 45px 50px;
    }
    .box4 .limg{
        height: 600px;
        top:calc(50vh - 40px - 300px + 80px);
    }
    
    .box4 .min{
        margin-top: calc(50vh - 40px - 240px + 80px);
    }
    .box6 .limg{
        top:calc(50vh - 40px - 204px + 80px);
        max-width: 47%;
    }
    .box6 .min div{
        margin-top: calc(50vh - 40px - 215px + 80px);
    }
    .box1 .min{
        padding-top: calc(50vh - 130px);
    }
    .box2 .min{
        padding-top: calc(50vh - 180px);
    }
    .box3 .min{
        padding-top: calc(50vh - 150px);
    }
    .box5 .min{
        padding-top: calc(50vh - 160px);
    }
    .box7 .min{
        padding-top: calc(50vh - 230px);
    }

}
@media only screen and (max-width: 1380px){
    .box4 .min div{
        height: 440px;
        padding: 25px 50px;
    }
    .box4 .min{
        margin-top: calc(50vh - 40px - 220px + 80px);
    }
    .box4 .limg{
        height: 500px;
        top:calc(50vh - 40px - 250px + 80px);
    }
    .box6 .limg{
        top:calc(50vh - 40px - 174px + 80px);
    }
    .box6 .min div{
        margin-top: calc(50vh - 40px - 195px + 80px);
    }
}