.head{
    background: #fff;
}
.head p a{
    color: #333;
}
.head p a.hover{
    
}
.banner{
    position: relative;
    padding-top: 8rem;
    padding-left: 21%;
}
.banner>img{
    width: 100%;
    position: absolute;
    top: 0;
    left: 0;
}
.banner>div{
    float: left;
    position: relative;
    z-index: 2;
}
.down_load{
    width: 33%;
}
.down_load h1{
    font-size: 2.4rem;
    color: #fff;
}
.down_load h1 span{
    display: inline-block;
    border-bottom: 4px solid #fff;
  padding-bottom: 1rem;
}
.down_load p{
    font-size: 0.8rem;
    color: #fff;
    line-height: 1.3rem;
    margin-top:1rem
}
.down_load div{
    margin-top: 1.5rem;
    /* text-align: center; */
}
.down_load div span{
    margin-right: 1rem;
    font-size: 0.8rem;
    color: #fff;
    text-align: center;
    display: inline-block;
}
.down_load div span img{
    width:5.5rem ;
}
.banner div.img{
    margin-left: 5rem;
}
.banner div.img img{
    width: 25rem;
}
.advantage{
    width: 100%;
    text-align: center;
    margin-top: 4rem;
}
.advantage span{
    display: inline-block;
    margin-right: 9%;
    font-size: 16px;
    text-align: center;
}
.advantage span img{
    width: 3rem;
    margin-bottom: 0.5rem;
}
.product{
    position: relative;
    width: 100%;
    padding-left: 20%;
    box-sizing: border-box;
    padding-top: 8.5rem;
}
.product.reverse{
    padding-left: 0;
}
.product>img{
    position: absolute;
}
.reverse>div.product_img{
    margin-left:11rem;
}
.product>img.big_img{
    width: 100%;
    position: absolute;
    top: 0;
    left: 0;
}
.product>div{
    float: left;
    position: relative;
    z-index: 2;
}
.product>div.product_right{
    float: right;
}
.reverse>div.product_right{
    float: left;
}
.product_right img{
    width: 11rem;
}
.product_img img{
    width: 21rem;
}
.product_info{
    margin-left: 10rem;
    width: 20rem;
    padding-top: 9rem;
}
.product_info p.title{
    font-family: ArialMT;
    font-size: 1.5rem;
    width: 20rem;
    border-bottom: 1px solid #333;
    padding-bottom: 0.5rem;
}
.product_info h3{
    font-size: 1.5rem;
    margin-top: 0.5rem;
}
.product_info p.text{
    margin-top: 1.5rem;
    font-size: 16px;
    color: #666;
}
.semicircle img{
    width: 11rem;
}
.down_upload{
    padding:1.5rem 0;
    text-align: right;
    width: 100%;
    position: fixed;
    top: 3.1rem;
    left: 0;
    z-index: 999;
    /* background: rgba(0,0,0,0.5); */
    display: none;
}
.down_upload span{
    font-size: 0.8rem;
    color: #fff;
    display: inline-block;
    margin:0 1rem;
    background: rgba(0,0,0,0.5);
    padding:1rem;
    text-align: center;
}
.down_upload img{
    width:5.5rem ;
    height: 5.5rem;
    margin-bottom: 0.5rem;
}