.container .first-con{
  position: fixed;
  height: 100vh;
}
.container .banner{
  width: 100%;
  height: 500px;
  background: url('../image/learn/banner.jpg') center no-repeat;
  background-size:cover;
  padding: 0 8%;
  box-sizing: border-box;
  color: #fff;
}
.banner .banner-en{
  font-size: 30px;
  padding-top: 240px;
}
.banner .banner-zh{
  font-size: 20px;
  margin-top: 10px;
}

.container .main{
  padding: 0 8% 40px;
  box-sizing: border-box;
  overflow: hidden;
}
.main .nav{
  padding: 20px 0;
  border-bottom: 2px solid rgb(238,238,238);
  font-size: 16px;
  color: rgb(52,52,52);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}
.main .nav a{
  color: rgb(168,168,168);
}
.main .nav .tab-con{
  display: flex;
  padding-right: 20px;
  font-size: 17px;
}
.main .nav .tab-item{
  margin-left: 30px;
  position: relative;
}
.main .nav .tab-item:first-child{
  margin-left: 0;
}
.main .nav a.active{
  color: rgb(60,60,60);
}
.main .nav a.active::before{
  position: absolute;
  left: 0;
  bottom: -20px;
  width: 100%;
  height: 3px;
  background: #005AC8;
  content: "";
}
.main .main-bg{
  display: block;
  width: 100%;
  /* height: 500px; */
  /* background: url('../image/learn/learn9.jpg') center no-repeat; */
  /* background-size:cover; */
  margin-top: 40px;
}
.container .mobile-main{
  display: none;
  padding-bottom: 40px;
}

@media screen and (max-width:1200px) {
  .container .banner{
    padding: 0 15px;
  }
  .container .main{
    padding: 0 15px 40px;
  }
}

@media screen and (max-width:768px) {
  .main .nav .tab-con{
    padding: 15px 0 0 20px;
    font-size: 14px;
  }
  .main .nav .tab-item{
    margin-left: 10px;
    position: relative;
  }
  .main .main-bg{
    display: none;
  }
  .container .mobile-main{
    display: block;
  }
  .container .mobile-main .mobile-bg{
    width: 100%;
    height: 230px;
    background: url('../image/learn/learn9.jpg') center no-repeat;
    background-size:cover;
  }
}