*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", sans-serif;
}
body{
    background-color: #F6F6F6;
    font-size: 14px;
    color: #333;
}
ul,ol{
    list-style: none;
}
a{
    text-decoration: none;
    color: inherit;
}
img{
    max-width: 100%;
}
.flex{
    display: flex;
}
.container{
    width: 1200px;
    margin: 0 auto;
}
.container_main{
    width: 1200px;
    margin: 20px auto 50px;
    display: flex;
    box-shadow: 0 0 10px #ddd;
}
.left_nav{
    width: 190px;
    min-height: 689px;
    background-color: #E7E7E7;
    border-left: 10px solid #FFA415;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 10px 0;
    flex-shrink: 0;
}
.spoc_layer .left_nav{
    min-height: initial;
}
.left_nav .spoc_btn + .spoc_btn{
    margin-left: 0;
    margin-top: 10px;
}

.input_item{
    margin-bottom: 10px;
}
.input_item label{
    display: inline-block;
    vertical-align: top;
    text-align: right;
    line-height: 36px;
}
.input_item img{
    display: inline-block;
    vertical-align: top;
}
.video_play_item{
    position: relative;
}
.video_play_item::before{
    content: "";
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    background-color: rgba(0,0,0,0.3);
    z-index: 1;
}
.video_play_item .play{
    position: absolute;
    top: 50%;
    left: 50%;
    width: 36px;
    height: 36px;
    transform: translate(-50%,-50%);
    background-color: #fff;
    border-radius: 10px;
    z-index: 2;
}
.spoc_input,
.spoc_select{
    width: 180px;
    height: 36px;
    border: 1px solid #dcdcdc;
    border-radius: 4px;
    padding-left: 8px;
}
.spoc_textarea{
    border: 1px solid #dcdcdc;
}
.spoc_btn{
    display: inline-block;
    vertical-align: top;
    border: 1px solid #dcdcdc;
    background-color: #fff;
    height: 36px;
    line-height: 34px;
    padding: 0 15px;
    border-radius: 6px;
    text-align: center;
}
.spoc_btn:hover{
    background-color: #FFA415;
    color: #fff;
}
.spoc_btn_sm{
    height: 28px;
    line-height: 26px;
    font-size: 13px;
    padding: 0 12px;
}
.spoc_btn_xs{
    height: 20px;
    line-height: 18px;
    font-size: 12px;
    padding: 0 8px;
}
.spoc_btn + .spoc_btn{
    margin-left: 12px;
}
.spoc_btn_sm + .spoc_btn_sm{
    margin-left: 10px;
}
.spoc_btn_xs + .spoc_btn_xs{
    margin-left: 8px;
}
.spoc_btn.cur{
    background-color: #FFA415;
    color: #fff;
}

.right_show{
    flex-grow: 1;
    background-color: #fff;
}
.search_item{
    overflow: hidden;
    padding: 10px 15px;
    border-bottom: 1px solid #dcdcdc;
}
.search_item .search_input{
    float: right;
    border: 1px solid #FFA415;
    border-radius: 6px;
    width: 180px;
    height: 36px;
    padding-left: 10px;
}
.search_item .search_btn{
    float: right;
    border-color: #FFA415;
    margin-left: 12px;
}

.card_list{
    display: flex;
    flex-wrap: wrap;
    gap: 30px 15px;
    padding: 15px;
}
.card{
    width: 220px;
    height: 170px;
    border: 1px solid #dcdcdc;
    border-radius: 10px;
    background-color: #FFF2DF;
    margin-top: 20px;
    position: relative;
}
.teaching_card{
    padding-top: 10px;
    margin-top: 0;
}
.teaching_card p + p{
    margin-top: 2px;
}
.card .cover{
    width: 198px;
    height: 100px;
    border-radius: 10px;
    overflow: hidden;
    margin: -20px 0 5px 10px;
    box-shadow: 0 0 2px 0 #999;
    position: relative;
}
.card .cover img{
    width: 100%;
    min-height: 100%;
}
.card .cover .drag{
    position: absolute;
    top: 10px;
    right: 10px;
    width: 32px;
    min-height: auto;
    height: 32px;
    cursor: move;
    background-color: rgba(179,179,179,0.6);
    border-radius: 6px;
}
.card .name,
.card .num{
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    padding: 0 10px;
    line-height: 22px;
}
.card .tool{
    display: flex;
    justify-content: space-evenly;
    margin-top: 5px;
}
.card .tool img{
    width: 26px;
    height: 26px;
    cursor: pointer;
}
.card .special{
    position: absolute;
    bottom: 14px;
    right: 10px;
    color: #FFA415;
    font-size: 12px;
}

.btn_tool{
    display: flex;
    justify-content: center;
}
.btn_tool_sm img{
    width: 18px;
    height: 18px;
    cursor: pointer;
    margin: 1px 2px;
}

.spoc_layer{
    max-width: 1200px;
    max-height: 98%;
    box-shadow: 0 0 50px #999;
    border-radius: 0 0 10px 10px;
    border-top: 5px solid #FFA415;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    background-color: #fff;
    overflow: auto;
    display: none;
}
.spoc_layer_head{
    height: 40px;
    line-height: 40px;
    padding: 0 15px;
}
.spoc_layer_head .close{
    float: right;
    width: 20px;
    height: 20px;
    cursor: pointer;
    margin: 9px 0 0;
}
.spoc_layer_main{
    border-top: 1px solid #dcdcdc;
    padding: 15px;
}

.spoc_item{
    margin: 15px;
    border-radius: 10px;
    box-shadow: 0 0 5px 0 #999;
    overflow: hidden;
}
.spoc_item_head{
    height: 40px;
    line-height: 40px;
    padding: 0 15px;
    background-color: #FFA415;
    color: #fff;
}
.spoc_item_head .spoc_btn,
.spoc_item_head_sm .spoc_btn{
    float: right;
    background-color: #FFA415;
    border-color: #fff;
    margin: 6px 0 0 5px;
}
.spoc_item_head .spoc_input{
    display: inline-block;
    vertical-align: top;
    margin-top: 6px;
    height: 28px;
    margin-right: 15px;
    width: 100px;
}
.spoc_item iframe{
    width: calc(100% - 30px);
    height: 800px;
    margin: 15px;
}
.spoc_item_main{
    padding: 15px;
}
.spoc_item_main_flex{
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.spoc_item_sm{
    width: 160px;
    min-height: 90px;
    font-size: 12px;
    border-radius: 8px;
    border: 1px solid #dcdcdc;
    overflow: hidden;
    cursor: pointer;
}
.spoc_item_head_sm{
    height: 30px;
    line-height: 30px;
    padding: 0 8px;
    background-color: #FFA415;
    color: #fff;
}
.spoc_item_head_sm .spoc_btn_xs{
    margin-top: 5px;
}
.spoc_item_main_sm{
    padding: 8px;
}

.message_box{
    height: 100%;
    display: flex;
    flex-direction: column;
    gap: 15px 0;
    justify-content: space-between;
}
.message_box .message_list {
    flex-grow: 1;
    overflow: auto;
    min-height: 500px;
    padding-bottom: 15px;
}
.message_box .message_item {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}
.message_box .message_item_my {
    flex-direction: row-reverse;
}
.message_box .message_item .user_icon {
    min-width: 38px;
    max-width: 52px;
    height: 38px;
    border-radius: 50%;
    flex-shrink: 0;
}
.message_box .message_item .user_icon img {
    width: 100%;
    height: 100%;
}
.message_box .message_item .message_main {
    background-color: #FFF2DF;
    padding: 5px 10px;
    line-height: 28px;
    border-radius: 3px;
    max-width: 80%;
}
.message_box .message_item .message_main img{
    vertical-align: top;
}
.message_box .message_send {
    display: flex;
    gap: 10px;
    flex-shrink: 0;
}
.message_box .message_send input {
    border-color: #FFA415;
    flex-grow: 1;
}
.message_box .message_send .send_btn{
    width: 36px;
    height: 36px;
    flex-shrink: 0;
}
.message_box .message_send .spoc_btn{
    border-color: #FFA415;
}

.user_list{
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    padding: 15px;
}
.user_list .user_item{
    min-width: 68px;
    text-align: center;
}
.user_list .user_item .user_head{
    width: 48px;
    height: 48px;
    border-radius: 50%;
    cursor: pointer;
}
.user_list .user_item .user_head_grey{
    filter: grayscale(1);
}
.user_list .user_item .delete{
    width: 18px;
    height: 18px;
    border: 1px solid #999;
    border-radius: 50%;
    padding: 2px;
    cursor: pointer;
}

.message_layer{
    position: fixed;
    top: 50%;
    left: 50%;
    padding: 20px 30px;
    background-color: #FFA415;
    color: #fff;
    font-size: 14px;
    transform: translate(-50%,-50%);
    border-radius: 10px;
    box-shadow: 0 0 25px 0 #666;
    z-index: 999;
}