.item-btn{display:inline-block;width:47.396%;margin-bottom:3.208%;border-radius:0.08rem;transition:box-shadow .2s ease-out;cursor:pointer;box-shadow:0 0 .04rem rgb(13,46,78,.22);}
.item-btn:hover{box-shadow:0 .04rem .24rem rgb(13,46,78,.22);}
.item-btn:nth-child(2n){margin-left:5.208%}
.item-btn:last-child{width:100%}
.popup-mask{display:none;position:absolute;top:0;left:0;width:100%;min-height:100%;padding:1rem 0 .2rem;background-color:rgba(0,0,0,.8);overflow:auto;}
.popup-mask .popup{position:relative;max-width:10.8rem;padding:0 0.3rem 0.8rem;margin:0 auto;}
.popup-content3::before{background-image:url(../images/knowledge/popup/3-bg.jpg);background-repeat:no-repeat;;background-position:center top;background-size:100%;}
.popup-content4::before{background-image:url(../images/knowledge/popup/4-bg.jpg);background-repeat:no-repeat;;background-position:center top;background-size:100%;}
.popup-content5::before{background-image:url(../images/knowledge/popup/5-bg.jpg);background-repeat:no-repeat;;background-position:center top;background-size:100%;}
.item.popup-content .item-body .item-body-img{padding-bottom:4.582%}
.popup-content .img-absolute2-1-1{top:0;right:2%;width:43%}
.popup-content .img-absolute3-1-1{top:0;right:2%;width:47.9%}
.popup-content .img-absolute3-3-1{top:34%;left:2.5%;width:27.8%}
.popup-content .img-absolute3-5-1{top:7.5%;right:2%;width:39.2%}
.popup-content .img-absolute5-4-1{top:22.5%;right:2%;width:34.7%}
.popup-close{background-repeat:no-repeat;background-position:center;background-size:100%;cursor:pointer;}
.pc .popup-close{position:fixed;left:50%;top:50%;z-index:2;width:.95rem;padding-top:2.15rem;margin-left:6.02rem;background-image:url(../images/knowledge/popup-btn.png);transition:transform .4s ease-out}
.phone .popup-close{width:21.5%;padding-top:9.5%;margin:5% auto 0;background-image:url(../images/knowledge/popup-btn-phone.png);}
.popup-close:hover{transform:translateY(-4px);}