/*课程页导航*/
/*.course_top .search_ul {*/
/*    display: none;*/
/*    position: absolute;*/
/*    background: #fff;*/
/*    border-radius: 0 0 5px 5px;*/
/*    !*min-width: 100%;*!*/
/*    width: max-content;*/
/*    padding-right: 1em;*/
/*    writing-mode: initial;*/
/*    letter-spacing: initial;*/
/*    top: 100%*/
/*}*/

.course_top {
    z-index: 100;
    position: fixed;
    width: 100%;
    height: 3.8rem;
    display: -webkit-flex; /* safari*/
    display: flex;
    justify-content: space-between;
    flex-wrap: nowrap;
    background: #071B2F;
    padding: 0 1rem;
}

.course_top .logo_div {
    position: relative;
    width: 10rem;
    min-width: 6rem;
    height: 3.8rem;
    cursor: pointer;
    display: inline-block;
    margin-right: 0.42rem;
}

.course_top .logo_div img {
    position: relative;
    width: 100%;
    height: auto;
    top: 44%;
    transform: translateY(-50%);
    cursor: pointer;
}

.course_top .course_title {
    /*flex: 0 0 auto;*/
    font-size: 1.3rem;
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
    cursor: default;
    color: #fff;
    display: inline-block;
    height: 3.8rem;
    line-height: 3.8rem;
    font-family: 宋体;
}

.course_top .nav_right {
    /*flex: 0;*/
    /*flex: 0 1 auto;*/
    display: flex;
    width: auto;
    height: 3.8rem;
}

.course_top .nav_item {
    /*flex: 0 0 auto;*/
    height: 3.8rem;
    margin: 0 .75rem;
    line-height: 3.8rem;
    position: relative;
    /*width: 100%;*/
    color: white;
    font-size: 1.5rem;
    font-family: 'Helvetica', "Microsoft YaHei";
    word-break: keep-all;
    display: inline-block;
    cursor: pointer;
}

.course_top .nav_item.search_item {
    font-size: 0;
    margin: 0 .5rem;
}

.course_top .search {
    margin: .65rem 0;
    height: 2.5rem;
    font-size: 1rem;
    /*min-width: 2rem;*/
    /*width: calc(16vw - 3rem);*/
    color: #071b2f;
    font-family: 'Helvetica', '宋体';
    padding-left: 1.8em;
    padding-right: .1em;
    cursor: text;
    border: none;
    border-radius: 4px;
    box-sizing: border-box;
    background-image: url(/v3/img/icon_search.png);
    background-size: 1.8em 1.8em;
    background-repeat: no-repeat;
    background-position: 0 center;
    background-color: rgba(255, 255, 255, 0.8);



    display: inline-block;
    width: 100%;
    outline: none;
}

.course_top .other_course_cat {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    font-size: 14px;
    font-weight: 100;
    line-height: 2em;
    width: 10em;
    background: #071c31;
    display: none;
}

.course_top .hover_other_course:hover .other_course_cat {
    display: block;
}

.course_top .other_course_cat a {
    width: 100%;
    display: inline-block;
    color: #fff;
    background: #071c31;
}

.course_top .other_course_cat .hover_blue:hover {
    background: #107eec;
}

/* 其他课程右侧子菜单*/
.course_top .other_course_cat_item .other_course_detail {
    position: absolute;
    top: 0;
    left: 100%;
    display: none;
    height: calc(100vh - 3rem);
    overflow: auto;
    cursor: default;
    width: 12em;
    word-break: break-all;
    text-align: center;
    font-size: 14px;
    font-weight: 100;
    line-height: 2em;
}

.course_top .other_course_cat_item:hover .other_course_detail {
    display: block;
}

.course_top .other_course_cat .second_title {
    color: #9c9c9c;
    text-align: left;
    padding-left: 1rem;
    box-sizing: border-box;
}

.course_top .drop_down_menu_bg,
.course_top .drop_down_menu {
    display: none !important;
}