.container .first-con{
  position: fixed;
  height: 100vh;
}
.container .banner{
  width: 100%;
  height: 500px;
  background: url('../image/product/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 .middle{
  width: 100%;
  padding: 30px;
  background: url('../image/product/product1.jpg') center no-repeat;
  background-size:cover;
  box-sizing: border-box;
  margin-top: 40px;
}
.main .middle .mid-spec{
  font-size: 16px;
  line-height: 24px;
  color: #fff;
}
.main .bottom{
  margin-top: 40px;
}
.main .bottom .bm-item{
  display: flex;
}
.bottom .bm-item .bm-lf{
  width: 50%;
  height: 400px;
}
.bottom .bm-item .lf1{
  background: url('../image/product/product3.jpg') center no-repeat;
  background-size:cover;
}
.bottom .bm-item .lf2{
  background: url('../image/product/product2.jpg') center no-repeat;
  background-size:cover;
}
.bottom .bm-item .bm-rt{
  width: 50%;
  height: 400px;
  padding: 0 0 0 30px;
  box-sizing: border-box;
  display: flex;
  justify-content: center;
  align-items: center;
  color: rgb(100,100,100);
}
.bottom .bm-item .rt-spec{
  font-size: 17px;
  line-height: 28px;
}
.main .mobile{
  display: none;
}

@media screen and (min-width: 1600px){
  .main .middle{
    height: 750px;
  }
}
@media screen and (min-width: 1201px) and (max-width: 1599px){
  .main .middle{
    height: 600px;
  }
}

@media screen and (max-width:1200px) {
  .container .banner{
    padding: 0 15px;
  }
  .container .main{
    padding: 0 15px 10px;
  }
  .main .middle{
    height: 500px;
  }
  .main .bottom{
    display: none;
  }
  .main .mobile{
    display: block;
    margin-top: 30px;
  }
  .mobile .bm-item .bm-lf{
    width: 100%;
    height: 300px;
  }
  .mobile .bm-item .lf1{
    background: url('../image/product/product3.jpg') center no-repeat;
    background-size:cover;
  }
  .mobile .bm-item .lf2{
    background: url('../image/product/product2.jpg') center no-repeat;
    background-size:cover;
  }
  .mobile .bm-item .bm-rt{
    width: 100%;
    padding: 20px 0;
    color: rgb(100,100,100);
  }
  .mobile .bm-item .rt-spec{
    font-size: 16px;
    line-height: 24px;
  }
}
@media screen and (max-width:768px) {
  .main .nav .tab-con{
    padding: 15px 0 0 5px;
    font-size: 12px;
  }
  .main .nav .tab-item{
    margin-left: 8px;
    position: relative;
  }
  .main .middle{
    height: 400px;
  }
}