@media screen and (min-width:751px){
body{background: #FAFAFA;margin: 0;}
/* .header{width: 100%;background: url('../../images/help/header3.png') no-repeat;font-size: 32px;color: #fff;position: relative;background-size: cover;} */
.header{width: 100%;background: linear-gradient(#1E184C,#2E2B61,#2D2F5F);font-size: 32px;color: #fff;position: relative;}
.header-title{position: absolute;top: 0;left: 16%;}
.index-title{position: absolute;top: 0;left: 6%;}
.index_img{display: none;}
.back-img{width: 80%;height: 100%;margin-left: 10%;min-height: 120px;max-width: 1220px;margin: 0 auto;object-fit: cover;display: block;}
.icon{padding: 0 20px;}
.jump{cursor: pointer;text-decoration: none;color: #fff;}
.main{width: 90%;margin: 0 auto;max-width: 1200px;color: #4F4F4F;display: flex;justify-content: space-between;font-size: 16px;letter-spacing: 0.02em;}
.left{width: 28%;height: calc(100vh - 220px);background: #fff;padding-top: 10px;margin-top: 20px;}
/* .li_menu:hover{background: #F4F8F7;cursor: pointer;} */
.li_menu{padding: 20px;}
#help_detail{background: #fff;width: 71%;height: calc(100vh - 230px);padding: 10px 30px;margin: 20px 0 0 20px;overflow: auto;}
.title{border-bottom: 1px solid  #E0E0E0;padding-bottom: 15px;}
.point-title{font-weight: normal;}
.red-tip{color: #EB5757;margin: 20px 0;}
.images{max-width: 100%;height: auto;margin: 10px 0 20px 0;}
.line_img{width: 48%;padding-right: 5px;}
.click-menu{border-left: 6px solid #28B28B;background: #F4F8F7;}
.index{border-bottom:.05rem solid #F2F2F2;background: url('../../images/help/arrow.png') no-repeat;background-position: 95%;background-size: 15px;}
.index:hover{background: url('../../images/help/arrow.png') #F4F8F7 no-repeat ;cursor: pointer;background-position: 95%;background-size: 15px;}
.index-ul{min-height: calc(100vh - 130px);font-size: 16px;}
.mobile-header{display: none;}
.mobile-icon{display: none;}
.relate{display: none;}
::-webkit-scrollbar{width: 6px;height: 10px;}
::-webkit-scrollbar-thumb{background: #b8b8b8;-webkit-border-radius:6px;opacity: 0.5;outline-offset: -2px;height: 50px;}
}
@media screen and (max-width:750px){
body{margin: 0 auto;font-size: .28rem;}
.left{display: none;}
.header{display: none;}
.back-img{display: none;}
.arrow{width: 1rem;}
.index_img{width: 100%;margin: 0 auto;padding: 0;display: block;}
.li_menu{font-size: .32rem;padding: .4rem 1rem .4rem .4rem;border-bottom:.04rem solid #F2F2F2;background: url('../../images/help/arrow.png') no-repeat;background-position: 95%;background-size: .3rem;}
#help_detail{padding:.35rem;overflow: auto;color: #4F4F4F;letter-spacing: 0.02em;}
.title{border-bottom: .05rem solid #E0E0E0;padding-bottom: .2rem;margin: 0;font-size: .32rem;}
.line_img{width: 48%;padding-right: .2rem;}
.red-tip{color: #EB5757;margin: .2rem 0;}
.images{max-width: 100%;height: auto;}
.point-title{margin: .3rem 0;font-size: .32rem;}
.mobile-header{font-size: .36rem;position: relative;font-weight: 600;}
.mobile-title{position: absolute;top: 50%;left: 2%;color: #fff;transform: translateY(-50%);}
.mobile-icon{padding: .1rem .2rem 0 0;width: 17%;}
.arrow-icon{padding-right: .1rem;}
.relate{padding: .5rem 0;}
.relate-li{border-bottom: .05rem solid #F2F2F2;border-top: .05rem solid #F2F2F2;}
.relate-title{background: url('../../images/help/student/relate.png') no-repeat;color: #4F4F4F;padding-left: .37rem;background-size: 10% 100%;}
.jump{width: 61%;}
}

.flex_start{display: flex;align-items: flex-start;}
.flex_between{display: flex;align-items: center;justify-content: space-between;}
.flex_center{display: flex;align-items: center;justify-content: center;padding: .5rem 0;}
.flex_header{display: flex;align-items: center;}
.header-img{margin: 0 auto;padding: 0;display: block;}
#ul_menu{list-style-type:none;padding: 0;margin: 0;background: #fff;}
.font-green{color: #28B28B;}
.link{text-decoration: none;color: #4F4F4F;width: 100%;display: inline-block;}
.extra{max-width: 750px;margin: 0 auto;}
.jump{cursor: pointer;text-decoration: none;color: #fff;}
.isShow{display: none;}
.no-show-style{padding-left: .2rem;}