.ind_part12{width: 100%;  padding-bottom: 55px;}
.ind_part12 .living {  width: 1200px;  margin: 15px auto 0;  }
.ind_part12 .living .lb_lf {  width: 640px;  height: 330px;  position: relative;  }
.ind_part12 .course_go {  width: 130px;  position: absolute;  top: 54px;  left: 50%;  z-index: 3;  margin-left: -65px;  }
.ind_part12 .course_go .live_on {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    margin: 0 auto;
    background-color: rgba(0,0,0,.7);
    text-align: center;
    box-sizing: border-box;
    padding-top: 22px;
}
.live_on .lo_icon {
    width: 32px;
    height: 32px;
    margin: 0 auto;
}
.lo_name {
    font-size: 12px;
    color: #fff;
    margin-top: 6px;
}
.instant_learn {
    margin-top: 30px;
}
.instant_learn a {
    display: block;
    width: 130px;
    height: 40px;
    background-color: #f08200;
    font-size: 16px;
    color: #fff;
    line-height: 40px;
    text-align: center;
    margin: 0 auto;
    border-radius: 5px;
}
.live_cover {
    width: 640px;
    height: 330px;
    position: absolute;
    top: 0px;
    left: 0px;
    display: block;
}
.live_cover a {
    display: block;
    width: 100%;
    height: 100%;
    position: relative;
}
.live_cover img {
    width: 100%;
    height: 100%;
}
.living .lb_rt {
    width: 560px;
    height: 330px;
    box-sizing: border-box;
    border: 1px solid #e3e3e3;
    border-left: none;
    background-color: #f2f3f3;
    position: relative;
}
.living .lb_rt ul {
    width: 100%;
    height: 330px;
    overflow-y: scroll;
}
.lb_rt li {
    width: 100%;
}
.lb_rt li.lb_active>a {
    background-color: #fff;
    border-color: #f08200;
}
.lb_rt li>a {
    display: block;
    width: 100%;
    height: 60px;
    position: relative;
    box-sizing: border-box;
    padding: 8px 36px 0 70px;
    border-left: 3px solid #f2f3f3;
}
.live_name {
    font-size: 16px;
    color: #454545;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.enroll_num {
    color: #999;
}
.enroll_num i {
    font-size: 14px;
}
.lb_rt li.lb_active>a:after {
    display: block;
}
.lb_rt li>a:after {
    content: "";
    width: 26px;
    height: 26px;
    box-sizing: border-box;
    border-radius: 50%;
    border: 1px solid #e3e3e3;
    background-image: url(../images/on.png);
    background-position: center center;
    background-repeat: no-repeat;
    left: 25px;
    top: 16px;
    background-color: #fff;
    display: none;
}
.lb_rt li>a:before, .lb_rt li>a:after {
    content: "";
    position: absolute;
    z-index: 2;
}
.lb_rt li>a:before {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background-color: #c6c6c6;
    top: 20px;
    left: 33px;
}
.lb_rt li>a:before, .lb_rt li>a:after {
    content: "";
    position: absolute;
    z-index: 2;
}
.lb_rt::before {
    content: "";
    width: 1px;
    height: 100%;
    background-color: #e3e3e3;
    position: absolute;
    top: 0;
    left: 40px;
    z-index: 1;
}
.lesson_price {
    color: #e54d50;
    font-size: 14px;
}
.live_list .item.hide {
    display: none;
}
.live_cover a::after {
    content: "";
    width: 100%;
    height: 100%;
    background-color: #000;
    opacity: 0.3;
    position: absolute;
    top: 0;
    left: 0;
}
.la_img {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    overflow: hidden;
    margin-top: 9px;
}
.lesson_about {
    width: 640px;
    height: 60px;
    position: absolute;
    left: 0px;
    bottom: 0px;
    background-color: rgba(0,0,0,.6);
    box-sizing: border-box;
    padding: 0 20px;
    display: block;
}
.la_name {
    color: #f1f1f1;
    line-height: 60px;
    margin-left: 10px;
    font-size: 14px;
}