.index_banner {
    width:100vw;
    position: fixed;
    top:70px;
    overflow: hidden;
}
.index_banner img {
    width:100%;
    height:100vh;
}

.index_banner .swiper-pagination-bullets {
    bottom:12%;
}
.index_banner .swiper-pagination-bullet {
    width:16px;
    height:16px;
}
.index_banner .swiper-button-prev {
    left:5%
}
.index_banner .swiper-button-next {
    right:5%
}
.index_banner .scroll_down{
    position: absolute;
    left:5%;
    bottom:5%;
    z-index: 9;
    animation: scroll_down 1s infinite linear;
}
@keyframes scroll_down {
    from {
        bottom: 40px;
        opacity: 0;
    }

    to {
        bottom: 20px;
        opacity: 1;
    }
}
.index_banner .ban_txt {
    position: absolute;
    z-index: 99;
    color: #FFFFFF;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
}
.index_banner .ban_txt .txt p{
    font-size: 30px;
}
.index_banner .ban_txt .txt p:first-child{
    font-size: 40px;
    margin-bottom: 40px;
}
.index_banner .mouse {
    position: absolute;
    right:5%;
    bottom:20%;
    z-index: 999;
    display: flex;
    align-items: center;
    color:#fff;
}
.index_banner .mouse .mouseOf {
    height: 28px;
    position: relative;
    width: 28px;
    display: block;
}
.index_banner .mouse .mouseOf svg {
    width:100%;
    height:100%;
    display: block;
}
.index_banner .mouse .mouseOf:after {
    -webkit-animation: scroll-down 1.5s ease-in-out infinite;
    animation: scroll-down 1.5s ease-in-out infinite;
    background-color: #fff;
    border-radius: 2px;
    content: "";
    height: 7px;
    left: 50%;
    position: absolute;
    -webkit-transform: translateX(-50%);
    transform: translateX(-50%);
    width: 2px
}
@keyframes scroll-down {
    0% {
        opacity: 0;
        top: 2px
    }
    30%,70% {
        opacity: 1
    }
    to {
        opacity: 0;
        top: calc(100% - 9px)
    }
}





.index_about {
    position: relative;
    padding:15vw 0 50px;
    margin-top: 100vh;
    background: #fff;
    overflow-x: hidden;
}
.index_about .xian {
    position: absolute;
    left: 0;
    top: 50px;
    z-index: 3;
    pointer-events: none;
    width:90vw;
}
.index_about .intro {
    font-size: 16px;line-height: 32px;text-indent: 32px;
}
.index_about ul {
    display: flex;
    padding: 50px 0;
}
.index_about ul li{
    flex:1;
    text-align: center;
}
.index_about ul li .tit{
    font-weight: 600;
    font-size: 20px;
    margin: 20px 0;
}
.index_about ul li .indicator .num{
    font-size: 30px;
    color:#004098;
    font-family: EUROSTILE-BOLDEXTENDEDTWO;
}
.index_about ul li .indicator i{
    font-size: 20px;
}
#about_mask {width:100vw;height:20vw;position: absolute;left:0;top: 50px;z-index: 4;background: #fff;transition:3s;}
#about_mask.act {
    left:100vw;
}




.index_product {
    position: relative;
    background:url('../images/pro_bg.jpg');
    background-size: 100% 100%;
}
.index_product .wrap_content {
    display: flex;
    padding-top: 30px;
}
.index_product .wrap_left {
    height: fit-content;
    top: 250px;
    position: sticky;
    width:40%;
    margin-bottom: 10px;
}
.index_product .wrap_right {
    width:60%;
}
.index_product .wrap_right img {
    display: block;
    transition: 0.5s;
}
.index_product .wrap_right a:hover img {
    transform: scale(1.05);
}



.index_advantages {
    position: relative;
    padding:100px 0 0;
    background: #fff;
}
.index_advantages .title{
    font-size: 36px;
    text-align: center;
    margin-bottom: 30px;
}
.index_advantages ul {
    margin-top: 60px;
}
.index_advantages ul li {
    width:48%;
    float: left;
    margin-bottom: 30px;
    background: #004098;
    height: 300px;
    display: flex;
    flex-direction: column;
    padding: 20px 20px 0 20px;
    color:#fff;
}
.index_advantages ul li:nth-child(odd) {
    margin-right: 4%;
    clear: both;
}
.index_advantages ul li .tit{
    font-size: 30px;
    font-weight: 600;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
}
.index_advantages ul li img{
    width:100px;
    margin-right: 10px;
}
.index_advantages ul li .des{
    font-size: 16px;
    line-height: 30px;
    height: 160px;
    overflow-y: auto;
}