.product_detail{
  padding-top: 90px;
  padding-bottom: 101px;
  background: url(../images/bg.png) no-repeat center bottom;
  background-size: 100% auto;
}
.product_detail_nav{
  display: flex;
	position:sticky;
	top:0px;
}
.product_detail_nav a{
  width: calc(25% - 1px);
  margin-right: 1px;
  background: #aaaaaa;
  font-size: 24px;
  color: #fff;
  font-weight: 600;
  height: 50px;
  line-height: 50px;
  text-align: center;
}
.product_detail_nav a:hover{
  background: #53b933;
}

.detail{
  margin-top: 55px;
}
.item{
  margin-bottom: 59px;
}
.title h3{
  font-size: 24px;
  line-height: 1;
}
.title .line{
  width: 69px;
  height: 2px;
  background: #53b933;
  margin-top: 19px;
}
.label{
  font-size: 16px;
  color: #ef1f1f;
  line-height: 1;
  margin-top: 33px;
}
.label img{
  width: 100%;
}
.imgs{
  display: flex;
  margin-top: 20px;
}
.imgs img{
  margin-right: 19px;
}
.text{
  line-height: 34px;
  font-size: 16px;
  margin-top: 10px;
}
.text h4{
  color: #666;
}
.text div{
  color: #666;
}

.btns{
  margin-top: 59px;
  display: flex;
  align-items: center;
}
.btns a{
  width: 137px;
  height: 43px;
  background: #aaaaaa;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 13px;
}
.btns a:hover{
  background: #53b933;
}
.btns a img{
  width: 21px;
  height: 12px;
  margin-right: 13px;
}
@media screen and (max-width: 764px){
  .product_detail{
    padding: 40px 0;
  }
  .product_detail_nav a{
    font-size: 16px;
    height: 40px;
    line-height: 40px;
  }
  .detail{
    margin-top: 30px;
  }
  .item{
    margin-bottom: 30px;
  }
  .title h3{
    font-size: 16px;
  }
  .label{
    font-size: 14px;
  }
  .text{
    font-size: 14px;
    line-height: 30px;
  }
  .btns{
    margin-top: 30px;
  }
}