body{
    width: 100%;
    overflow-x: hidden;
}
/* Float & Clear */
.fl{float:left;display:inline;}
.fr{float:right;display:inline;}
.clearfix:after{clear:both;content:".";display:block;font-size:0;height:0;line-height:0;visibility:hidden}
.clearfix{clear:both;zoom:1}
.txtEllipsis{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.floor1 {
    height: 760px;
    position: relative;
    margin-top: 72px;
    background: url(https://image.zhihuishu.com/zhs/ablecommons/demo/202106/f299074a7ddd4bccb4d6a01d3f0a744b.png) no-repeat bottom center;
    background-size: auto 760px;
}

.fl-container {
    width: 1200px;
    height: 100%;
    margin: 0 auto;
    position: absolute;
    bottom: 0;
    z-index: 10;
    left: 50%;
    transform: translateX(-50%);
    -webkit-transform: translateX(-50%);
    -moz-transform: translateX(-50%);
    -ms-transform: translateX(-50%);
    -o-transform: translateX(-50%);
}

.fl-bottom {
    position: absolute;
    right: 0;
    bottom: 0;
    width: 100%;
    height: auto;
    display: block;
}

.fl-cellPhone {
    position: absolute;
    right: 0;
    bottom: 0;
    width: 615px;
    height: 700px;
    z-index: 1;
}

.fl-banner .fl-tips {
    margin-top: 30px;
}

.fl-banner h2 {
    font-size: 56px;
    color: #2A2A2A;
    letter-spacing: 0.69px;
    line-height: 56px;
}

.fl-banner p {
    font-size: 28px;
    color: #2A2A2A;
    letter-spacing: 0.35px;
    line-height: 30px;
    margin-top: 10px;
}

.fl-code-wapper {
    position: absolute;
    top: 190px;
}

.fl-student {
    margin-left: 18px;
    margin-top: 60px;
    cursor: pointer;
    position: relative;
}

.fl-teacher {
    margin-top: 60px;
    cursor: pointer;
    position: relative;
}
.fl-student span {
    background: #3D84FF;
    border-radius: 24px;
    width: 165px;
    height: 48px;
    line-height: 48px;
    text-align: center;
    font-size: 18px;
    margin-right: 27px;
    display: inline-block;
    color: #fff;
}

.fl-codeImg-stu {
    width: 200px;
    height: 195px;
    background: url(https://image.zhihuishu.com/zhs_yufa_150820/able-commons/demo/201908/5b9baba1373d4c16847abcf976e86b62.png) no-repeat;
    padding: 37px;
    position: absolute;
    left: -15px;
    top: 46px;
    padding-top: 36px;
}

.fl-codeImg-stu img ,.fl-codeImg-tch img{
    width: 124px;
    height: 124px;
}

.fl-codeImg-stu img:first-child {
    margin-right: 10px;
}
.stu-img,.tch-img{
    display: none;
}
.fl-codeImg-tch {
    width: 200px;
    height: 195px;
    background: url(https://image.zhihuishu.com/zhs_yufa_150820/able-commons/demo/201908/5b9baba1373d4c16847abcf976e86b62.png) no-repeat;
    padding: 37px;
    position: absolute;
    left: -15px;
    top: 46px;
    padding-top: 36px;
}

.fl-teacher span {
    background: #475EEC;
    border-radius: 24px;
    width: 165px;
    height: 48px;
    line-height: 48px;
    text-align: center;
    font-size: 18px;
    display: inline-block;
    color: #fff;
}

.fl-teacher span:hover {
    background: #3C50CF;
}
.floor2 {
    height: 560px;
    position: relative;
    background: url(https://image.zhihuishu.com/zhs_yufa_150820/ablecommons/demo/202005/08f4b279d45b457798c7a773be1aa7d4.png) no-repeat top center;
    background-size: auto 560px;
}

.floor2 .floor2-waaper {
    width: 995px;
    margin: 0 auto;
    padding-top: 162px;
    margin-bottom: 127px;
}

.floor2 .floor2-waaper .f2-title {
    font-size: 48px;
    color: #2A2A2A;
    letter-spacing: 0.59px;
    text-align: right;
    line-height: 40px;
    margin-bottom: 109px;
    text-align: right;
}

.floor2 .floor2-waaper ul li {
    float: left;
    margin-right: 60px;
    text-align: center;
}

.floor2 .floor2-waaper ul li:last-child {
    margin-right: 0;
}

.floor2 .floor2-waaper ul li img {
    width: 140px;
    height: 140px;
    margin-bottom: 14px;
}

.floor2 .floor2-waaper ul li h2 {
    font-size: 32px;
    color: #2A2A2A;
    letter-spacing: 0.4px;
    text-align: center;
    line-height: 40px;
    margin-bottom: 11px;
}

.floor2 .floor2-waaper ul li span {
    font-size: 20px;
    color: #2A2A2A;
    letter-spacing: 0.25px;
    text-align: center;
    line-height: 25px;
    display: block;
}

.floor3 {
    height: 768px;
    position: relative;
    /* background: url(https://image.zhihuishu.com/zhs/able-commons/demo/201908/e2238b73323447ddbcd0d29e7f8091ca.png) no-repeat;
    background-size: 100%; */
}

.floor3 .fl3-bg,
.floor2 .fl3-bg {
    position: absolute;
    z-index: -1;
    width: 100%;
    height: 768px;
    object-fit: cover
}

.floor3 .floor3-waaper {
    width: 992px;
    margin: 0 auto;
}

.floor3 .fl3-title {
    font-size: 48px;
    color: #FFFFFF;
    letter-spacing: 0.59px;
    line-height: 40px;
    margin: 169px 0 116px;
    width: 411px;
}

.floor3 ul li {
    margin-bottom: 52px;
}

.floor3 ul li h2 {
    font-size: 36px;
    color: #FFFFFF;
    letter-spacing: 0.45px;
    line-height: 40px;
    padding-left: 16px;
    padding-right: 5px;
    display: inline-block;
    vertical-align: bottom
}

.floor3 ul li span {
    font-size: 20px;
    color: #FFFFFF;
    letter-spacing: 0.25px;
    line-height: 40px;
    position: relative;
    top: 8px;
}

.floor3 .fl3-cellPhone {
    margin-left: 70px;
    margin-top: 63px;
}

.floor4 {
    height: 768px;
    background: #F3F3F6;
}

.floor4 .fl4-wapper {
    width: 992px;
    margin: 0 auto;
}

.floor4 .fl4-wapper img {
    position: relative;
    left: -25px;
}

.floor4 .fl4-content {
    position: relative;
}

.floor4 .fl4-wapper h2 {
    font-size: 48px;
    color: #2A2A2A;
    letter-spacing: 0.67px;
    text-align: right;
    line-height: 30px;
    margin-bottom: 18px;
    margin-top: 252px;
}

.floor4 .fl4-wapper span {
    font-size: 20px;
    color: #2A2A2A;
    letter-spacing: 0.25px;
    text-align: right;
    line-height: 30px;
    display: block;
}

.floor4 .fl4-wapper .fl4-lookVideo {
    background: #3D84FF;
    border-radius: 24px;
    width: 126px;
    height: 48px;
    font-size: 16px;
    color: #FFFFFF;
    letter-spacing: 0.2px;
    line-height: 48px;
    margin-top: 76px;
    padding-left: 34px;
    cursor: pointer;
    position: absolute;
    right: 0;
}

.floor4 .fl4-wapper .fl4-lookVideo::before {
    display: inline-block;
    content: '';
    width: 20px;
    height: 20px;
    background: url(https://image.zhihuishu.com/zhs/able-commons/demo/201908/745c09fc2f1148ca891db5b19a026130.png) no-repeat;
    padding-right: 10px;
    position: relative;
    top: 4px;
}

.floor5 {
    height: 768px;
    background: #FFFFFF;
}

.floor5 .floor5-waaper {
    width: 1050px;
    margin: 0 auto;
}

.floor5 .floor5-waaper h3 {
    font-size: 48px;
    color: #2A2A2A;
    letter-spacing: 0.59px;
    text-align: center;
    line-height: 40px;
    padding-top: 101px;
    text-align: center;
    margin-bottom: 116px;
}

.floor5 .floor5-waaper ul li {
    float: left;
    margin-right: 183px;
    text-align: center;
}

.floor5 .floor5-waaper ul li:last-child {
    margin-right: 0;
}

.floor5 .floor5-waaper ul li>img {
    width: 220px;
    height: 220px;
    margin-bottom: 28px;
}

.floor5 .floor5-waaper ul li h2 {
    font-size: 32px;
    color: #2A2A2A;
    letter-spacing: 0.3px;
    text-align: center;
    line-height: 32px;
}

.floor5 .floor5-waaper ul li span {
    font-size: 24px;
    color: #3D84FF;
    letter-spacing: 0.22px;
    text-align: center;
    line-height: 24px;
    display: block;
    margin-top: 15px;
    cursor: pointer;
    position: relative;
}
.zhidao-codeImg5 img,.tch-codeImg5 img,.shuxia-codeImg5 img{
    width: 260px;
    height: 276px;
}
.zhidao-codeImg5 {
    display: none;
    /* background: url(https://image.zhihuishu.com/zhs_yufa_150820/able-commons/demo/201908/0ac0aff8f1184f7b991539058aa22e84.png) no-repeat; */
    background: none;
    padding: 0px;
    position: absolute;
    left: -25px;
    top: -301px;;
    padding-top: 29px;
}
.tch-codeImg5 {
    display: none;
    /* background: url(https://image.zhihuishu.com/zhs_yufa_150820/able-commons/demo/201908/8d11dd02b1414fae874837aef9828dd6.png) no-repeat; */
    background: none;
    padding: 0px;
    position: absolute;
    left: -23px;
    top: -301px;
    padding-top: 29px;
}
.shuxia-codeImg5{
    display: none;
    /* background: url(https://image.zhihuishu.com/zhs_yufa_150820/able-commons/demo/201908/8d11dd02b1414fae874837aef9828dd6.png) no-repeat; */
    background: none;
    padding: 0px;
    position: absolute;
    left: -17px;
    top: -301px;
    padding-top: 29px;
}
.mask{
    height: 100%;
    width: 100%;
    position: fixed;
    top: 0;
    left: 0;
    display: none;
    z-index: 10002;
    background: rgba(0, 0, 0, .6);
}
#stu-help-video{
    width:800px; 
    height:450px;
    position: fixed;
    top: 50%;
    left:50%;
    display: none;
    z-index: 10003;
    transform: translate(-50%,-50%);
    -webkit-transform: translate(-50%,-50%);
    -moz-transform: translate(-50%,-50%);
    -ms-transform: translate(-50%,-50%);
    -o-transform: translate(-50%,-50%);
}
#headerMain.keep-black{
    background: #000 !important;
}