.problem #navTitle{border-bottom:.02rem solid #ebebeb}.problem{position:absolute;width:100%;height:100%;background:#fff}.problem .dv_list{overflow:hidden;width:7.5rem;background:#fff}.problem .dv_list>ul>li{overflow:hidden;width:6.9rem;margin:0 auto;padding:.4rem 0 .25rem;border-bottom:.02rem solid #e1e1e1}.problem .dv_list>ul>li .item{display:-webkit-box;display:-ms-flexbox;display:flex;-webkit-box-pack:justify;-ms-flex-pack:justify;justify-content:space-between;-webkit-box-align:center;-ms-flex-align:center;align-items:center;cursor:pointer}.problem .dv_list>ul>li img{width:.3rem;-webkit-transition:-webkit-transform .3s ease-in-out;transition:-webkit-transform .3s ease-in-out;transition:transform .3s ease-in-out;transition:transform .3s ease-in-out,-webkit-transform .3s ease-in-out}.problem .dv_list>ul>li img.rotate-down{-webkit-transform:rotate(90deg);transform:rotate(90deg)}.problem .dv_list>ul>li .itemCon{line-height:.42rem;font-size:.24rem;max-height:0;margin-top:0;opacity:0;overflow:hidden;-webkit-transition:max-height .3s ease-in-out,margin-top .3s ease-in-out,opacity .3s ease-in-out;transition:max-height .3s ease-in-out,margin-top .3s ease-in-out,opacity .3s ease-in-out}.problem .dv_list>ul>li .itemCon.open{max-height:10rem;margin-top:.25rem;opacity:1}.problem .itemCon ul{padding-left:.3rem}.problem .itemCon ul li{list-style-type:disc;margin-bottom:.1rem}.problem .itemCon ul li:last-child{margin-bottom:0}.problem .itemCon ul li strong{font-weight:700}.problem .dv_list>ul>li:last-child{border-bottom:none}.problem .dv_list>ul>li span{overflow:hidden;font-size:.28rem}.problem .dv_list>ul>li p{overflow:hidden;display:block;line-height:.42rem;font-size:.24rem}.problem .chat{position:absolute;height:1rem;display:-webkit-box;display:-ms-flexbox;display:flex;-webkit-box-pack:center;-ms-flex-pack:center;justify-content:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;bottom:0;left:0}#navTitle{position:fixed;top:0;left:0;z-index:100;background-color:#fff}