/*主体内容开始*/
.main-bg{
    background:url("../img/course/main-bg.jpg") no-repeat;
    background-size: 100% 100%;
    width: 100%;
    padding-bottom: 177px;
}
.main .floor1{
    text-align: left;
    margin-left: 20px;
}
.main .floor1 .floor1-item1{
    color:#cecece;
    font-size: 32px;
    margin-bottom: 24px;
}
.main .floor1 .floor1-item2{
    font-size: 20px;
    color: black;
    font-weight: bolder;
}
.main .floor2{
    display: flex;
    justify-content:center;
    background: white;
    padding-bottom: 40px;
}
.main .floor2 .floor2-item1 .title img,
.main .floor2 .floor2-item2 .title img{
    width:136px;
    height:22px;
}
.main .floor2 li{
    margin-bottom: 93px;
}
.main .floor2 .floor2-item1 li:last-child,
.main .floor2 .floor2-item2 li:last-child{
    margin-bottom: 0px;
}
.main .floor2 .floor2-item1 li, .main .floor2 .floor2-item2 li {
    width: 504px;
    height: 150px;
    text-align: right;
    position: relative;
}
.main .floor2 .floor2-item2 li{
    text-align: left;
}
.main .floor2 .floor2-item1 .title-detail,
.main .floor2 .floor2-item2 .title-detail{
    color:#183c62;
    font-size: 14px;
    margin-top: 19px;
    margin-bottom: 17px;
}
.main .floor2 .floor2-item1{
    margin-top: 84px;
}
.main .floor2 .floor2-item2{
    margin-left: 80px;
    position: relative;
}
.main .floor2 .floor2-item1 .floor-info p,
.main .floor2 .floor2-item2 .floor-info p{
    color: #8c8a8a;
    font-size: 14px;
    line-height: 25px;
}
.main .floor2 .floor2-item2 li:nth-child(1)>.title::before{
    background: url(../img/course/time-right-active.png) no-repeat;
    background-size: 100% 100%;
}
.main .floor2 .floor2-item1 li>.title::after,
.main .floor2 .floor2-item2 li>.title::before{
    content: "";
    display: inline-block;
    width: 32px;
    height: 20px;
    background: url(../img/course/time-left.png) no-repeat;
    background-size: 100% 100%;
    position: absolute;
    top: 4px;
    right: -54px;
    z-index: 99;
}
.main .floor2 .floor2-item2 li>.title::before{
    background: url(../img/course/time-right.png) no-repeat;
    background-size: 100% 100%;
    left:-45px;
}
.main .floor2 .floor2-item2::before{
    content: "";
    display: inline-block;
    border: 1px solid #c9c9c9;
    height: 1284px;
    position: absolute;
    left: -36px;
    z-index: 90;
    top: -40px;
}
/*主体内容结束*/