/*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 0.35rem 0 0;
}
.course_top .logo_div {
    position: relative;
    width: 9rem;
    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: 37%;
    transform: translateY(-50%);
    cursor: pointer;
}
.course_top .course_title {
    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 {
    width: 2.8rem;
    height: 2.5rem;
    border: 1px solid #fff;
    border-radius: 0.1rem;
    background-image: url(/v3/img/icon_list_w.png);
    background-size: 90%;
    background-repeat: no-repeat;
    background-position: center;
    cursor: pointer;
    background-color: #071b2f;
    margin: .65rem 0;
}
.course_top .nav_item {
    display: none !important;
}
.course_top .drop_down_menu_bg {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    height:100vh ;
    z-index: 2;
    background-color: rgba(0, 0, 0, 0.5);
}
.course_top .drop_down_menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    overflow: hidden;
    color: #fff;
    border-top: 1px solid #fff;
    background: #071b2f;
    flex-direction: column;
    align-items: center;
    justify-content: space-evenly;
    font-size: 1.2rem;
    z-index: 2;
}
.course_top .drop_down_menu li {
    width: 100%;
    padding: .3rem 0;
    cursor: pointer;
    text-align: center;
}