/* 头部 */
.navigation_item_solution{
    border-bottom: 2px transparent solid;
    padding: 6px 0px;
}
.navigation_roll .navigation_item_solution{
    border-bottom: 2px transparent solid !important;
    padding: 6px 0px !important;
}
.navigations_children_item_education{
    background: transparent;
}

.navigation_item_explain{
    border-bottom: 2px white solid;
    padding: 6px 0px;
}
.navigation_roll .navigation_item_explain{
    border-bottom: 2px #3e6ef1 solid !important;
    padding: 6px 0px !important;
}
.navigations_children_item_explain{
    background: #F5F7FD;
}
.navigation_roll{
    box-shadow: initial;
    border-bottom: 1px solid #E9ECF5;
}
.content_white{
    flex-wrap: wrap;
}
.explain-nav{
    box-sizing: border-box;
    margin-bottom: 30px;
    background: #fff;
    height: 48px;
    box-shadow: 0px 10px 20px rgba(119, 140, 162, 0.1);
}
.explain-nav-list{
    /*width: 1200px;*/
    align-items: flex-start;
    flex-wrap: wrap;
}
.explain-nav-item{
    font-size: 16px;
    color: #778CA2;
    cursor: pointer;
    margin-right: 50px;
    position: relative;
}
.explain-nav-item:last-child{
    margin-right: 0;
}
.active-nav{
    color: #252631;
    /* background: #3E6EF1;
    color: #fff; */
}
.active-nav::after{
    content: '';
    position: absolute;
    left: 0;
    bottom: -12px;
    width: 100%;
    height: 2px;
    background: #3E6EF1;
}
.explain-nav-item:last-child{
    border-right: none;
}
.content_box{
    align-items: flex-start;
    box-sizing: border-box;
}
.menu-tree{
    width: 249px;
    margin: 10px;
    padding: 10px;
    box-sizing: border-box;
    border-right: 1px solid #e6e6e6;
}
.menu-item{
    overflow: hidden;
    max-height: 56px; 
    transition: all 0.5s ease-out;
}

.menu-title{
    height: 56px;
    cursor: pointer;
    padding: 0 10px;
}
.menu-icon, .menu-icon-bot{
    width: 16px;
    height: 16px;
    margin-right: 4px;
}
.menu-icon-bot{
    margin-right: 0;
    transition: 0.5s ease;
}

.menu-title:hover{
    outline: 0;
    background: #ecf5ff;
}

.menu-item-child{
    height: 50px;
    cursor: pointer;
    padding-right: 10px;
    box-sizing: border-box;
    margin: 0;
}
.menu-item-child:hover{
    outline: 0;
    background: #ecf5ff;
}
.active{
    color: #409eff;
}

.menu-child{
    overflow: hidden;
    max-height: 0; 
    transition: all 0.5s ease-out;
}
.menu-item-active{
    transition: all 0.5s ease-out;
    max-height: 9999px;
}
.menu-icon-bot-active{
    transform: rotate(180deg);
}
.explain-content{
    flex: 1;
    padding: 10px;
    box-sizing: border-box;
}
.explain-content img {
    max-width: 100%;
}
.no-more{
    text-align: center;
}
.video-item{
    width: 32%;
    margin-right: 18px;
    margin-bottom: 18px;
    font-size: 0;
    cursor: pointer;
    background: #fff;
    overflow: hidden;
}
.video-item:nth-child(3n){
    margin-right: 0;
}
.video-item img{
    width: 100%;
    height: 155px;
    background: #A6B6C6;
    object-fit: cover;
}
.video-msg{
    background: #fff;
    border: 1px solid #EAEDF3;
    border-top: none;
    overflow: hidden;
    padding: 12px 12px;
    box-sizing: border-box;
}
.video-msg h4{
    margin: 0 0;
    font-weight: 400;
    font-size: 14px;
    color: #252631;
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
    margin-bottom: 4px;
}
.video-msg span{
    font-size: 12px;
    color: #778ca2;
}
#pagination{
    display: none;
}
.video-model{
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2022;
    background: rgba(0, 0, 0, 0.7);
    transform: scale(0);
    transition: all .3s;
}
.show-model{
    transform: scale(1);
}
.video-content{
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
    width: 900px;
    height: 573px;
    background-color: #fff;
    border-radius: 2px;
    overflow: hidden;
}
.video-header{
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #F5F7FD;
    height: 46px;
    padding: 0 24px;
    box-sizing: border-box;
}
.video-header div{
    width: calc(100% - 40px);
    font-weight: 400;
    font-size: 14px;
    color: #252631;
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
}
.video-header img {
    width: 16px;
    height: 16px;
    cursor: pointer;
}
.video-url{
    height: 479px;
    margin: 24px 24px;
}
.video-url video {
    display: block;
    width: 100%;
    height: 100%;
}