body {
  margin: 0 auto;
  background-color: #ffffff;
  font-family: "PingFang SC", Helvetica, Arial, "Hiragino Sans GB", "Microsoft Yahei";
}
.nav {
  margin-bottom: 100px;
}
.nav .nav-center {
  width: 1100px;
  margin: 0 auto;
}
.nav .nav-center .nav-listing {
  padding-top: 30px;
  width: 230px;
}
.nav .nav-center .nav-listing .jiazai {
  height: 44px;
  line-height: 44px;
  text-align: center;
  background-image: linear-gradient(0deg, #2de6d5 0%, #14c9ab 100%);
}
.nav .nav-center .nav-listing .jiazai span {
  font-family: PingFangSC-Medium;
  font-size: 16px;
  line-height: 22px;
  height: 22px;
  color: #FFFFFF;
  letter-spacing: 0;
}
.nav .nav-center .nav-listing ul {
  background-image: linear-gradient(-176deg, #ffffff 0%, #f2f2f2 100%);
}
.nav .nav-center .nav-listing ul li {
  width: 230px;
  height: 46px;
  line-height: 46px;
  text-align: center;
}
.nav .nav-center .nav-listing ul li img {
  float: left;
  margin-top: 17px;
  margin-left: 20px;
  width: 5px;
  height: 12px;
}
.nav .nav-center .nav-listing ul li span {
  height: 22px;
  line-height: 22px;
  font-family: PingFangSC-Regular;
  font-size: 16px;
  color: #AAAAAA;
}
.nav .nav-center .nav-listing ul li .key2 {
  width: 200px;
  height: 1px;
  margin-left: 15px;
  background: #E5E5E5;
  margin-top: -2px;
}
.nav .nav-center .nav-listing ul .active > a > span {
  color: #505050;
}
.nav .nav-center .nav-listing .contact {
  padding-top: 20px;
}
.nav .nav-center .nav-listing .contact .contact-di {
  height: 180px;
  background-image: linear-gradient(-176deg, #ffffff 0%, #f2f2f2 100%);
}
.nav .nav-center .nav-listing .contact .contact-di .contact-nav {
  width: 179px;
  height: 110px;
  line-height: 20px;
  padding-top: 37px;
  margin-left: 25px;
  font-family: PingFangSC-Regular;
  font-size: 14px;
  color: #464646;
  letter-spacing: 0;
}
.nav .nav-center .nav-listing .contact .contact-di .contact-nav span {
  line-height: 20px;
  margin-bottom: 25px;
}
.nav .nav-center .nav-img {
  width: 821px;
  padding-top: 30px;
  margin-left: 49px;
}
.nav .nav-center .nav-img .img-top h4 {
  margin-top: 10px;
  height: 22px;
  line-height: 22px;
  font-family: PingFangSC-Regular;
  font-size: 16px;
  color: #494949;
}
.nav .nav-center .nav-img .img-top .img-top-daoheng {
  float: right;
  margin-top: -20px;
  font-family: PingFangSC-Regular;
  font-size: 12px;
  color: #272727;
  letter-spacing: 0;
}
.nav .nav-center .nav-img .img-top .img-top-daoheng span {
  font-size: 12px;
  height: 17px;
  color: #000000;
  letter-spacing: 0;
  line-height: 17px;
}
.nav .nav-center .nav-img .img-top .img-top-daoheng span:last-child a {
  color: #689EDE;
}
.nav .nav-center .nav-img .img-top .key {
  width: 826px;
  height: 2px;
  margin-top: 10px;
  background: #EDEDED;
}
.nav .nav-center .nav-img .img-top .key3 {
  width: 72px;
  height: 5px;
  margin-top: -3px;
  background: #1BCBAE;
}
.nav .nav-center .nav-img .down .load ul {
  min-height: 422px;
  margin-top: 17px;
}
.nav .nav-center .nav-img .down .load ul li {
  float: left;
  width: 400px;
  height: 44px;
  margin-right: 10px;
  margin-bottom: 20px;
  background: #FFFFFF;
  border: 1px solid #BABABA;
  border-radius: 4px;
  box-sizing: border-box;
}
.nav .nav-center .nav-img .down .load ul li p {
  display: inline-block;
  float: left;
  margin-top: 9px;
  margin-left: 25px;
  font-family: PingFangSC-Regular;
  font-size: 16px;
  color: #535353;
  letter-spacing: 0;
}
.nav .nav-center .nav-img .down .load ul li .load-img {
  width: 56px;
  height: 44px;
  float: right;
  background: #FFFFFF;
  border-left: 1px solid #BABABA;
  border-bottom: 1px solid #BABABA;
  border-radius: 4px;
  box-sizing: border-box;
}
.nav .nav-center .nav-img .down .load ul li .load-img .load-nav {
  width: 20px;
  height: 20px;
  line-height: 38px;
  margin: 0 auto;
  text-align: center;
}
.nav .nav-center .nav-img .down .load ul li .load-img .load-nav img {
  width: auto;
  height: auto;
  width: 100%;
  height: 100%;
  vertical-align: middle;
}
.nav .nav-center .nav-img .down .load .fenye {
  margin: 0 auto;
}