body,button,input,select,textarea{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,PingFang SC,Source Han Sans CN,Hiragino Sans GB,Microsoft YaHei,WenQuanYi Micro Hei,sans-serif}*{-webkit-tap-highlight-color:transparent}html{font-size:100px}[v-cloak]{display:none!important}.content{width:7.5rem;min-height:100vh;margin:auto;padding-bottom:calc(0rem + env(safe-area-inset-bottom));background:url("//images.koolearn.com/shark/project/zt/2019/0903xxj-wap/i/banner.jpg?cee58c") top center no-repeat #ff6640;background-size:7.5rem 5.42rem;-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box;display:-webkit-box;display:-ms-flexbox;display:-webkit-flex;display:-moz-flex;display:-ms-flex;display:flex;-webkit-box-orient:vertical;-ms-flex-direction:column;-webkit-flex-direction:column;-moz-flex-direction:column;flex-direction:column;-webkit-box-align:center;-ms-flex-align:center;-webkit-align-items:center;-moz-align-items:center;align-items:center}.nav-placeholder{width:7.5rem;margin-top:5.4rem}.nav-box{overflow:hidden;width:7.5rem;margin:5.4rem auto 0;background:#e8176e;display:-webkit-box;display:-ms-flexbox;display:-webkit-flex;display:-moz-flex;display:-ms-flex;display:flex}.nav-box.nav-fixed{position:fixed;z-index:9999;top:0;left:0;right:0;margin-top:0}.nav-box .nav-operation{width:.5rem;height:.85rem;background:url("//images.koolearn.com/shark/project/zt/2019/0903xxj-wap/i/unfold.png?1cf517") center no-repeat;background-size:.22rem .13rem}.nav-box .nav-operation.unfold{background-image:url("//images.koolearn.com/shark/project/zt/2019/0903xxj-wap/i/fold.png?f490b8")}.nav-list{font-size:0;overflow-x:auto;width:7rem;white-space:nowrap}.nav-list.unfold{white-space:pre-wrap}.nav-list::-webkit-scrollbar{display:none}.nav-list .nav-item{font-size:.32rem;line-height:.85rem;position:relative;display:inline-block;margin:0 .3rem;color:#fff}.nav-list .nav-item:hover{text-decoration:none}.nav-list .nav-item.active{color:#ffea00}.nav-list .nav-item.active:after{position:absolute;right:0;bottom:0;left:0;height:.04rem;content:'';border-radius:.02rem;background:#ffea00}.nav-list .nav-item.active+.nav-item.active{color:#fff}.nav-list .nav-item.active+.nav-item.active:after{display:none}