.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 {
  color:#fff!important;
}

.middle {
  width: 100%;
  height: 840px;
  background: url(../images/bg.png) no-repeat;
  background-position: center;
  background-size: cover;
  position: relative;
}
.middle_wrapper{
  position: absolute;
  top: 52%;
  left: 18%;
  display: flex;
  margin-left: -20px;
}
.middle_wrapper a{
  margin-left: 20px;
  display: block
}
.middle img{
  cursor: pointer;
}
.middle img:last-of-type{
  margin-left: 10px;
}

.footer {
  width: 100%;
  height: 80px;
  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;
}