/* banner图 */
html,
body {
    position: relative;
    height: 100%;
}
body {
    background: #fff;
    font-size: 14px;
    color: #000;
    margin: 0;
    padding: 0;
}
.banner{
    width:100%;
    height:740px;
    position: relative;
}
.banner .banner_img{
    width:100%;
    height:100%;
}
.banner .banner_text{
    position: absolute;
    left:0;
    right:0;
    top:200px;
    margin:auto;
    text-align:left;
    color:#fff;
}
.banner .banner_text h3{
    font-size:80px;
}
.banner .banner_text h4 {
    font-size: 44px;
    margin-top:50px;
    font-weight: normal;
}

/* 第二屏 */
.main{
    padding:70px 0 50px;
}
.main h3{
    font-size:50px;
    color:#000;
    text-align:center;
    margin-bottom:70px;
    font-weight: normal;
}
.main ul li{
    display:flex;
    justify-content: space-between;
    align-items: center;
}
.main ul li .item_text{
    color:#535353;
    font-size:30px;
    line-height:48px;
}
.main ul li .pic1{
    width:368px;
    margin-right:108px;
}
.main ul li .pic2 {
    width: 445px;
    margin-left: 64px;
}
.main ul li .pic3 {
    width: 360px;
    margin-right: 110px;
}
.main ul li .pic4 {
    width: 420px;
    margin-left: 48px;
}
.main ul li .pic5 {
    width: 393px;
    margin-right: 77px;
}
.main ul li .pic6 {
    width: 393px;
    margin-left: 97px;
}
.main ul li .pic7 {
    width: 393px;
    margin-right: 84px;
}
.main ul li .pic8 {
    width: 393px;
    margin-left: 81px;
}
.main ul li .item_text span{
    display:inline-block;
    width:12px;
    height:12px;
    background:#535353;
    border-radius: 50%;
    margin-right:10px;
}
.main ul li:nth-of-type(1){
    margin-bottom:110px;
}
.main ul li:nth-of-type(2) {
    margin-bottom: 96px;
}
.main ul li:nth-of-type(3) {
    margin-bottom: 100px;
}
.main ul li:nth-of-type(4) {
    margin-bottom: 110px;
}
.main ul li:nth-of-type(5) {
    margin-bottom: 0px;
}
.main ul li:nth-of-type(6) {
    margin-bottom: 60px;
}
.main ul li:nth-of-type(7) {
    margin-bottom: 60px;
}