.pd{
    padding:110px 0 80px 0;
    box-sizing: border-box;
    position:relative;
    width:100%;
    height:100%;
}
.hide{
    display: none;
}
.nav {
    width: 100%;
    background: #fff;
    position: absolute;
    top: 0;
}
.nav_wrap {
    width: 1200px;
    height: 110px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.nav ul {
    list-style: none;
}
.nav ul li {
    float: left;
}
.nav ul li a {
    width: 100px;
    height: 36px;
    font-size: 16px;
    font-family: MicrosoftYaHei;
    font-weight: 400;
    color: #000;
    line-height: 36px;
    padding: 0 10px;
    border-radius: 18px;
    display: block;
    text-align: center;
    margin-left: 20px;
    text-decoration: none;
}
.active {
    background:linear-gradient(90deg,rgba(69,90,255,1),rgba(169,49,254,1));
    color:#fff!important;
}

.middle {
    width: 100%;
    height: 100%;
    background: url(../images/bg.png) no-repeat;
    background-position: center;
    background-size: cover;
}
.middle_wrapper{
    width:1200px;
    height:100%;
    margin:0 auto;
    position:relative;
}
.middle_wrapper div{
    position:absolute;
    bottom: 40%;
}
.middle img{
    cursor: pointer;
}
.middle img:last-of-type{
    margin-left: 10px;
}

.footer {
    position:absolute;
    bottom:0;
    width: 100%;
    height: 80px;
    background: #fff;
    text-align: center;
}
.footer span {
    line-height: 80px;
    text-align: center;
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    padding-top:20px;
    font-size:14px;
    font-family:MicrosoftYaHei;
    font-weight:400;
    color:#000;
}

.down{
    position:fixed;
    top:0;
    width:100%;
    height:100%;
    z-index: 999;
    background-color: rgba(0, 0, 0, .5);
}

.down_wrap{
    width:460px;
    height:514px;
    background: #fff;
    position:absolute;
    left:50%;
    top:50%;
    border-radius: 8px;
    transform: translate(-50%,-50%);
    display: flex;
    align-items: center;
    flex-direction: column;

}
.down p{
    margin:0
}

.down_wrap img:first-of-type{
    margin:76px 0 25px 0;
}
.down_wrap img:last-of-type{
    position: absolute;
    bottom:-80px;
    cursor: pointer;
}

.down_wrap p{
    font-size:26px;
    font-weight:400;
    color:rgba(0,0,0,1);
    margin-top:26px;
}
.down_wrap p:last-of-type{
    font-size:22px;
}