html, body {
    margin: 0;
    padding: 0;
    font-family: "Microsoft YaHei", "微软雅黑", "Lantinghei SC", "Open Sans", Arial, "Hiragino Sans GB", "STHeiti", "WenQuanYi Micro Hei", SimSun, sans-serif;
    font-size: 14px;
    color: #666;
    overflow: hidden;
    overflow-y: auto;
    background-color: #2A2A2A;
}

h3, img, p {
    margin: 0;
    padding: 0;
}

.title{
    height: 60px;
    line-height: 60px;
    background-color: #303136;
    color: #fff;
    position: relative;
    overflow: hidden;
}

.title h3{
    float: left;
    color: #fff;
    font-size: 16px;
    text-align: center;
    width: 100%;
}

.title .prev,
.title .next{
    float: left;
    position: absolute;
    max-width: 280px;
    cursor: pointer;
}

.title .prev span,
.title .next span{
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
    display: inline-block;
    max-width: 260px;
    font-size: 12px;
}

.title .prev:hover,
.title .next:hover{
    color: #27DAB3;
}

.title .prev{
    left: 15px;
}

.title .prev > i{
    float: left;
    font-size: 18px;
    padding-right: 5px;
}

.title .next{
    right: 15px;
}

.title .next > i{
    float: right;
    padding-left: 5px;
}

.title .prev > i,
.title .next > i{
    font-size: 18px;
    line-height: 62px;
}

.player-center{
    position: absolute;
    left: 0;
    bottom: 0;
    top: 0;
}

.resource-preview{
    width: 100%;
    position: absolute;
    top: 60px;
    bottom: 0;
}
.resource-preview-scrollbar {
    overflow-y: auto;
}

.resource-preview .text_preivew{
    color: #fff;
}

.resource-preview .learn_text_word {
     background-color: #fff;
     color: #333;
     width: 1200px;
     padding: 40px;
     margin: 48px auto;
}
@media screen and (max-width: 1700px) {
    .resource-preview .learn_text_word {
        width: 900px;
    }
}
@media screen and (max-width: 1500px) {
    .resource-preview .learn_text_word {
        width: 800px;
    }
}
.resource-preview .learn_text_word_child {
    border: 1px solid rgba(151, 151, 151, 0.1);
    padding: 8px;
    min-height: 600px;
}
.resource-preview .learn_text_word_child_child {
    border: 1px solid rgba(151, 151, 151, 0.1);
    min-height: 600px;
}
.resource-preview .learn_text_word_content {
    margin: 40px;
}

.resource-preview .text_preivew .download-file{
    text-align: center;
    display: block;
    margin-top: 20%;
    text-decoration: underline;
    color: #fff;
    font-size: 16px;
}
.resource-preview::-webkit-scrollbar{
    width: 8px;
}

.resource-preview::-webkit-scrollbar-track {
    -webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.2);
    -webkit-border-radius: 5px;
    border-radius: 5px;
}
.resource-preview::-webkit-scrollbar-thumb{
    -webkit-border-radius: 5px;
    border-radius: 5px;
    background: #ccc;
    -webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.5);
}

.player-catalog{
    width: 370px;
    position: absolute;
    top: 0;
    bottom: 0;
    right: 0;
    color: #fff;
    overflow-y: auto;
    background-color: #353535;
}

.player-catalog .catalog-title{
    font-size: 16px;
    font-weight: normal;
    padding: 0 20px;
    height: 59px;
    line-height: 60px;
    border-bottom: 2px solid #3A3A3A;
    color: #A2A2A2;
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
}

.player-catalog .catalog-title img{
    display: block;
    float: left;
    margin-top: 21px;
    width: 22px;
    margin-right: 5px;
}

.player-catalog .ztree{
    overflow-y: auto;
    position: absolute;
    width: 100%;
    bottom: 0;
    top: 62px;
}

.player-catalog .ztree::-webkit-scrollbar{
    width: 8px;
}

.player-catalog .ztree::-webkit-scrollbar-track {
    -webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.2);
    -webkit-border-radius: 5px;
    border-radius: 5px;
}
.player-catalog .ztree::-webkit-scrollbar-thumb{
    -webkit-border-radius: 5px;
    border-radius: 5px;
    background: #ccc;
    -webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.5);
}

.slide-btn{
    width: 10px;
    height: 37px;
    background: #747474;
    border-top-left-radius: 3px;
    border-bottom-left-radius: 3px;
    cursor: pointer;
    position: fixed;
    right: 370px;
    top: 120px;
    text-align: center;
}

.slide-btn i{
    color: #fff;
    font-size: 12px;
    padding-top: 13px;
}

.user-message{
    color: #bfbfbf;
    font-size: 18px;
    text-align: center;
    margin-top: 100px;
}