* {
    margin: 0;
    padding: 0;
}

body {
    padding-top: 100px;
    background: #F1F2F5;
}

.help-header {
    position: fixed;
    z-index: 1;
    top: 0;
    left: 0;
    width: 100%;
    background: #fff;
    height: 70px;
    box-shadow: 0px 1px 2px 0px rgba(0, 0, 0, 0.3);
}

.header-wrap {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.system-name {
    height: 100%;
    display: flex;
    align-items: center;
}

.system-name img {
    margin-right: 12px;
}

.menu-list {
    height: 100%;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    font-size: 18px;
    font-weight: bold;
}

.menu-list > a {
    display: block;
    margin-left: 50px;
    border-bottom: solid 4px transparent;
    cursor: pointer;
    padding-top: 6px;
    padding-bottom: 6px;
    text-decoration: none;
    color: #666;
}

.menu-list > a.active {
    color: #C80B4D;
    border-color: #C80B4D;
}

.container {
    width: 1200px;
    margin: 0 auto;
}

.main-body {
    background: #fff;
    padding: 40px 20px;
}

.col-page {
    display: flex;
    align-items: flex-start;
}

.side-bar {
    width: 180px;
    margin-right: 40px;
    min-height: 300px;
    background: #f2f2f2;
}

.parent-category {
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: #fff;
    background-image: linear-gradient(to right, #C80B4D, #EF6341);
}

.parent-category img {
    margin-right: 10px;
}

.category-list {
    padding-top: 10px;
}

.category-list.active > .sub-level {
    display: block;
}

.category-list.hide > .sub-level {
    display: none;
}

.category-list.active .arrow-up {
    display: block;
}

.category-list.active .arrow-down {
    display: none;
}

.category-list.hide .arrow-up {
    display: none;
}

.category-list .arrow-down
.category-list.hide .arrow-down {
    display: none;
}

.first-level {
    position: relative;
    padding-left: 30px;
    font-size: 14px;
    height: 42px;
    line-height: 42px;
    font-weight: bold;
    cursor: pointer;
}

.first-level .arrow {
    position: absolute;
    right: 10px;
    top: 10px;
    width: 16px;
}

.sub-level {
    background: #FAFAFA;
    padding: 15px 0;
}

.category-cell {
    padding-left: 40px;
    height: 20px;
    line-height: 20px;
    font-size: 12px;
    border-left: solid 4px transparent;
    margin-top: 10px;
}

.category-cell:first-child {
    margin-top: 0;
}

.category-cell a {
    text-decoration: none;
    color: #000;
    cursor: pointer;
}

.category-cell.active {
    border-color: #C80B4D;
}

.category-cell.active a {
    color: #C80B4D;
}

.content-wrap {
    flex: 1
}

.doc-title {
    font-size: 18px;
    color: #C80B4D;
    padding-bottom: 20px;
    font-weight: bold;
}


.video-wrap {

}

.video-wrap:not(:first-child) {
    padding-top: 30px;
}

.video-wrap .title-wrap {
    border-bottom: solid 2px #EBEBEB;
    color: #C80B4D;
}

.video-wrap .title-wrap > div {
    display: inline-block;
    font-size: 14px;
    font-weight: bold;
    margin-bottom: -2px;
    padding: 6px 12px;
    border-bottom: solid 2px #C80B4D;
}

.video-list {
    list-style: none;
    padding-top: 20px;
}

.video-list li {
    display: inline-block;
    margin-right: 20px;
}

.video-img {
    width: 150px;
    height: 150px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f2f2f2;
}

.video-list li a img {
    max-width: 150px;
    max-height: 150px;
}

.video-list li .video-title {
    display: block;
    line-height: 24px;
    text-align: center;
    font-size: 12px;
    text-decoration: none;
    color: #999;
}

.video-detail-title {
    font-size: 16px;
    font-weight: bold;
    padding-bottom: 10px;
}

.video-detail-extend {
    font-size: 12px;
    color: #999;
    padding-bottom: 10px;
}

.video-player-dialog {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    z-index: 10;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-player {
    width: 100%
}

.resource-list {
    list-style: none;
    padding-top: 20px;
}

.resource-list li {
    display: inline-block;
    margin-right: 20px;
}

.resource-list li a img {
    width: 100px;
    height: 100px;
    border-radius: 6px;
}

.resource-list li .resource-title {
    display: block;
    line-height: 24px;
    text-align: center;
    font-size: 12px;
    text-decoration: none;
    color: #999;
}

.help-footer {
    margin-top: 40px;
    height: 150px;
    background-color: #373D41;
}

.help-footer .container {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
}