.teacher .head {
    width: 100%;
    height: 300px;
    background: url(https://static.chuanghehui.com/chh_bc/images/teacher.png) center no-repeat;
    background-size: cover;
    position: relative;
}
.teacher .head .bg {
    position: absolute;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, .8);
}
.teacher .head .text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 0 60px;
}
.teacher .head .text .content {
    line-height: 26px;
}

/* tab */
.teacher .nav{
    width: 100%;
    height: 60px;
    line-height: 60px;
    background-color: #fff;
    border-top: 1px solid #E7E7E7;
    border-bottom: 1px solid #E7E7E7;
    z-index: 2;
    top: 60px;
    box-shadow: 0 2px 6px 2px rgba(100, 100, 100, 0.1);
}
.teacher .nav .wrapper {
    height: 100%;
    padding: 0 40px;
}
.teacher .nav .tab-nav-item {
    color: #898989;
    height: 100%;
    cursor: pointer;
    position: relative;
    margin-right: 90px;
}
.teacher .nav .tab-nav-item:hover {
    color: #2D2D2D;
    position: relative;
}
.teacher .nav .tab-nav-item.active {
    color: #2D2D2D;
    cursor: default;
    position: relative;
}
.teacher .nav .tab-nav-item::before,
.teacher .nav .tab-nav-item.active::before {
    position: absolute;
    content: '';
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%);
    border-bottom: 4px solid #AD7C58;
    border-radius: 8px;
}
.teacher .nav .tab-nav-item::before {
    width: 0;
    transition: width 0.1s linear;
}
.teacher .nav .tab-nav-item:hover::before,
.teacher .nav .tab-nav-item.active::before {
    width: 50%;
}
.list-container .wrapper {
    padding: 80px 0 100px;
}
.list-container .wrapper .item {
    width: 177px;
    height: 240px;
    position: relative;
    margin-bottom: 28px;
    margin-right: 20px;
    border-radius: 4px;
    box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.13);
    padding: 22px 18px 20px;
    text-align: center;
}
.list-container .wrapper .item .avatar {
    width: 90px;
    border-radius: 50%;
    margin-bottom: 17px;
}
.list-container .wrapper .item .name {
    color: #CFA957;
    font-size: 16px;
    padding-bottom: 12px;
    margin-bottom: 15px;
    border-bottom: 1px dashed #C9C9C9;
}
.list-container .wrapper .item .title {
    color: #747474;
    font-weight: 600;
    padding: 0 12px;
}
.list-container .wrapper .item .mask {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background-color: rgba(0, 0, 0, .8);
    border-radius: 4px;
    display: block;
    opacity: 0;
    transition: all 0.5s linear;
}
.list-container .wrapper .item .btn-mask {
    height: 0;
    position: absolute;
    width: 100%;
    bottom: 0;
    left: 0;
    transition: all 0.2s linear;
}
.list-container .wrapper .item .btn-mask .btn {
    width: 130px;
    height: 30px;
    line-height: 30px;
    text-align: center;
    font-size: 12px;
    color: #fff;
    border: 1px solid #fff;
    border-radius: 30px;
    cursor: pointer;
}
.list-container .wrapper .item:hover .mask {
    opacity: 1;
}
.list-container .wrapper .item:hover .btn-mask {
    height: 62px;
}



.list-container .no-data img {
    width: 508px;
    margin: 100px auto 242px;
}