.container{
    background-color: #f3f4f8;
}
.container .center {
    display: flex;
    justify-content: center;
    align-items: center;
}

.topBar{
    height: 137px;
    box-sizing: border-box;
}
.navigation{
    padding: 35px 0;
}

.section-140{
    height: 485px;
    /* background-color: #f3f4f8; */
}



.section-140 .section-140-content{
    height: 100%;
    background-color: #ffffff;
    padding: 30px 25px;
    display: flex;
    justify-content: space-between;
    box-sizing: border-box;
}

.section-140 .section-140-content-video{
    width: 676px;
    height: 427px;
    object-fit: cover;
    /* background-color: skyblue; */
}
.section-140 .section-140-content-video .cover-play-btn{
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    border-radius: 50%;
}
.section-140 .section-140-content-info{
    width: 451px;
    height: 427px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
}

.section-140 .section-140-content-info .course-document,.off-line-listen{
    font-size: 18px;
    font-family: "SourceHanSansCN";
    color: rgb(51, 51, 51);
}

.section-140 .section-140-content-info .course-document-get,.off-line-study{
    font-size: 14px;
    font-family: "SourceHanSansCN";
    color: rgb(102, 102, 102);
}

.section-140 .section-140-content-info .course-btn{
    width: 85px;
    height: 30px;
    font-size: 14px;
    font-family: "SourceHanSansCN";
    color: rgb(255, 255, 255);
    background-color: #fe4334;
    border-radius: 20px;
    -webkit-border-radius: 20px;
    -moz-border-radius: 20px;
    -ms-border-radius: 20px;
    -o-border-radius: 20px;
}


.section-140 .section-140-content-info .item1{
    width: 451px;
    height: 70px;
    border-bottom: solid 2px #f1f1f1;
    font-size: 24px;
    font-family: "SourceHanSansCN";
    color: rgb(51, 51, 51);
    text-align: left;
}

.section-140 .section-140-content-info .item2{
    width: 451px;
    height: 77px;
    background-color: #f6f7f9;
}

.section-140 .section-140-content-info .item3{
    width: 451px;
    height: 77px;
    background-color: #f6f7f9;
}
.section-140 .section-140-content-info .item4{
    width: 451px;
    height: 145px;
}

.icon-common{
    background: url('./img/play-page/icon.png');
}
.icon-common-item2{
    width: 50px;
    height: 50px;
    background-position: 10px 0;
}

.icon-common-item3{
    width: 50px;
    height: 50px;
    background-position: -44px 0;
}
.section-140 .section-140-content-info .course-outer{
    height: 120px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.section-140 .section-140-content-info .course-item{
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    row-gap: 20px; /* 设置行间隙（上下gap） */
    column-gap: 15px; /* 设置列间隙（左右gap） */
}
.section-140 .section-140-content-info .course-details{
    position: relative;
    margin-left: 15px;
    font-size: 14px;
    font-family: "SourceHanSansCN";
    color: rgb(102, 102, 102);
}
.section-140 .section-140-content-info .course-details::before{
    content: '';
    position: absolute;
    width: 5px;
    height: 5px;
    background-color: #f9bd64;
    border-radius: 50%; /* 将背景制作成圆形 */
    top: 8px;
    left: -15px;
    /* margin-right: 5px;
    vertical-align: middle;  */

}
.section-140 .section-140-content-info .free-get{
    width: 135px;
    height: 30px;
    /* position: relative; */
    margin-left: -15px;
    margin-top: 3px;
    text-align: center;
    line-height: 30px;
    background: linear-gradient(to right,#ff583e,#ffa464);
    font-size: 14px;
    font-family: "SourceHanSansCN";
    color: rgb(255, 255, 255);
    border-radius: 20px;
    -webkit-border-radius: 20px;
    -moz-border-radius: 20px;
    -ms-border-radius: 20px;
    -o-border-radius: 20px;
}
/* .section-140 .section-140-content-info .free-get::before{
    content: '';
    width: 30px;
    height: 30px;
    background-position:0 -50px ;
    position: absolute;
} */

.section-140 .section-140-content-info .icon-gift{
    width: 35px;
    height: 35px;
    background-position:0 -50px ;
    z-index: 5;
}

.section-150{
    height: 747px;
    display: flex;
    gap: 20px;

}
.line-column{
    width: 3px;
    height: 15px;

    background-color: #3fbbce;
}

.section-150 .course-dir{
    width: 885px;
    height: 100%;

    background-color: #ffffff;
}
.section-150 .course-dir .course-dir-title{
    height: 70px;
    padding: 25px 0 25px 30px;
    font-size: 20px;
    font-family: "SourceHanSansCN";
    color: rgb(51, 51, 51);
    display: flex;
    align-items: center;
    border-bottom: solid 1.5px #eeeeee;
    box-sizing: border-box;
}

.section-150 .course-dir .course-dir-details{
    height: calc(100% - 70px);
    overflow-y: auto;
    padding-left: 35px;
    padding-right: 60px;
    box-sizing: border-box;
}

.section-150 .course-dir .course-dir-details-item{
    font-size: 16px;
    font-family: "SourceHanSansCN";
    color: rgb(102, 102, 102);
}

.section-150 .course-dir .course-dir-details li.selected .course-dir-details-item{
    color: #3fbbce;
}

.section-150 .course-dir .course-dir-details-item .icon{
    width: 18px;
    height: 11px;
    background: none;
    margin: 5px 10px 0 0;
}
.section-150 .course-dir .course-dir-details li.selected .course-dir-details-item .icon{
    background: url('./img/play-page/icon.png') 0 -150px;
}

.section-150 .course-dir .course-dir-details-item .order{
    min-width: 60px;
}



/*  推荐课程 */
.section-160{
    height: 600px;
    margin-top: 45px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.section-160 .text-overflow-ellipsis{
    white-space: nowrap;
    /* 超出容器时裁剪文本 */
    overflow: hidden;
    /* 在裁剪的文本末尾添加省略号 */
    text-overflow: ellipsis;
}

.section-160 .section-title-container{
    display: flex;
    width: 1200px;
    justify-content: space-between;
    align-items: center;
}

.section-160 .section-title-container .section-title{
    font-size: 18px;
    font-family: "SourceHanSansCN";
    color: rgb(51, 51, 51);
}
.section-160 .section-title-content{
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    grid-template-rows: repeat(2, auto);
    gap: 25px;
    margin-top: 35px;
}
.section-160 .section-title-content .section-title-content-item{
    width: 220px;
    height: 235px;
    box-shadow:  9px 0px 32px #e5ebf2;
    border-radius: 10px;
    -webkit-border-radius: 10px;
    -moz-border-radius: 10px;
    -ms-border-radius: 10px;
    -o-border-radius: 10px;
    background: #fff;
    overflow: hidden;
}
.section-160 .section-title-content .section-title-content-item .section-title-content-item-img{
    width: 100%;
    height: 125px;
    border-radius: 10px 10px 0 0;
    -webkit-border-radius: 10px 10px 0 0;
    -moz-border-radius: 10px 10px 0 0;
    -ms-border-radius: 10px 10px 0 0;
    -o-border-radius: 10px 10px 0 0;
}

.section-160 .section-title-content .section-title-content-item .section-title-content-item-txt{
    padding: 20px 18px 0 15px;
}

.section-160 .section-title-content .section-title-content-item .section-title-content-item-txt .section-title-content-item-title{
    font-size: 16px;
    font-family: "SourceHanSansCN";
    color: rgb(51, 51, 51);
    /* font-weight: bold; */
}


.section-160 .section-title-content .section-title-content-item .section-title-content-item-txt .section-title-content-item-dsc{
    font-size: 14px;
    font-family: "SourceHanSansCN";
    color: rgb(153, 153, 153);
    margin-top: 10px;
}

.section-160 .section-title-content .section-title-content-item .section-title-content-item-txt .view-teach{
    width: 65px;
    height: 25px;
    background-color: #f88451;
    margin: 20px 0;
    font-size: 12px;
    font-family: "SourceHanSansCN";
    color: rgb(255, 255, 255);
}