html, body {
    width: 100%;
    height: 100%;
    background-color: #f5f6f9;
}

header {
    width: 100%;
    height: 90px;
    padding: 0 calc(50% - 600px);
    background-color: #ffffff;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-sizing: border-box;
    box-shadow: 0px 1px 0px 0px #F5F6F9;
}

header .logo {
    /*width: 188px;*/
    height: 42px;
    background-size: 100% 100%;
}

header .logo img {
    max-width: 100%;
    max-height: 100%;
}

header .menu {
    display: flex;
    justify-content: start;
    align-items: center;
}

header .menu .sin {
    min-width: 55px;
    font-size: 16px;
    font-family: MicrosoftYaHei;
    color: #333333;
    line-height: 21px;
    margin-right: 35px;
    text-align: center;
    cursor: pointer;
    position: relative;
}

header .menu .sin.active {
    color: #F37B1D;
    font-weight: bold;
}

header .menu .sin .bottom_line {
    width: 50%;
    height: 3px;
    background-color: #F37B1D;
    position: absolute;
    bottom: -10px;
    left: 0;
    right: 0;
    margin: 0 auto;
    display: none;
}

header .head_btns {
    display: flex;
    flex-wrap: nowrap;
}

header .login_btn {
    width: 72px;
    height: 34px;
    background: #F37B1D;
    border-radius: 17px;
    font-size: 16px;
    font-family: MicrosoftYaHei;
    color: #FFFFFF;
    line-height: 34px;
    margin-right: 10px;
    text-align: center;
}

header .login_btn:hover {
    opacity: 0.8;
}

header .reg_btn {
    width: 72px;
    height: 34px;
    background: #FFFFFF;
    border-radius: 17px;
    border: 1px solid #F37B1D;
    font-size: 16px;
    font-family: MicrosoftYaHei;
    color: #F37B1D;
    line-height: 34px;
    text-align: center;
}

header .reg_btn:hover {
    background: #F37B1D;
    color: #ffffff;
}

header .user_info {
    position: relative;
}

header .user_avatar {
    width: 34px;
    height: 34px;
    border-radius: 17px;
    margin: 0 auto 5px;
    display: block;
    text-align: center;
}

header .user_account {
    font-size: 14px;
    font-family: MicrosoftYaHei;
    color: #333333;
    line-height: 19px;
}

header .user_info .pop {
    width: 88px;
    height: 78px;
    background: #FFFFFF;
    box-shadow: 0px 0px 18px 0px rgba(0, 0, 0, 0.08);
    border-radius: 6px;
    padding: 7px 16px;
    position: absolute;
    bottom: -76px;
    left: 0;
    box-sizing: border-box;
    display: none;
}

header .user_info .pop .line {
    width: 100%;
    font-size: 14px;
    font-family: PingFang-SC-Medium, PingFang-SC;
    font-weight: 500;
    color: #333333;
    text-align: center;
    line-height: 26px;
    padding: 3px 0;
    cursor: pointer;
}

header .user_info .pop .line:first-child {
    border-bottom: 1px solid #E9E9E9;
}

header .user_info .pop .line.active {
    color: #F37B1D;
}

header .user_info .pop .line:hover {
    opacity: 0.5;
}

/* 页面底部 */

footer {
    padding: 60px calc(50% - 600px);
    box-sizing: border-box;
    background-color: #0F1319;
    width: 100%;
}

footer .foot_text {
    font-size: 14px;
    font-family: MicrosoftYaHei-Bold, MicrosoftYaHei;
    font-weight: bold;
    color: #616468;
    line-height: 19px;
    margin-bottom: 20px;
}

footer .foot_text a {
    color: #616468;
    margin-right: 20px;
}

footer .foot_bottom {
    display: flex;
    margin-top: 82px;
}

footer .foot_bottom .foot_left {
    width: 680px;
    margin-right: 25px;
}

footer .foot_bottom .foot_qrcode {
    display: flex;
}

footer .foot_bottom .foot_qrcode .sin {
    width: 144px;
    height: 144px;
    background: #FFFFFF;
    border-radius: 5px;
    padding: 6px;
    margin-right: 30px;
}

footer .foot_bottom .foot_qrcode .sin:last-child {
    margin-right: 0;
}

footer .foot_bottom .foot_qrcode .sin img {
    width: 144px;
    height: 144px;
}

footer .foot_bottom .foot_qrcode .sin .imgTitle {
    text-align: center;
    margin-top: 30px;
    font-size: 14px;
    font-family: MicrosoftYaHei;
    color: #FFFFFF;
    line-height: 19px;
}

.classInfo {
    display: none;
    position: absolute;
    background-color: #F4F5F8;
    border-right: 1px solid #E9E9E9;
    z-index: 100;
    height: 483px;
    /*opacity: 0.7;*/
}

.classInfo .item {
    width: 200px;
    height: 60.5px;
    font-size: 16px;
    color: #333333;
    font-weight: 500;
    line-height: 54px;
    padding-left: 20px;
    cursor: pointer;
}

.classInfo .item:hover {
    background-color: #FFFFFF;
}

.classInfo .item div {
    height: 449px;
    display: none;
    position: absolute;
    top: 0;
    margin-left: 200px;
    background-color: #FFFFFF;
    border: 1px solid #d2d2d2;
    padding-left: 20px;
    width: 660px;
    min-height: 120px;
    line-height: 54px;
    box-shadow: 0px 4px 10px 0px rgba(0,0,0,0.1);
    /*opacity: 0.7;*/
}

.classInfo .item div span {
    display: inline-block;
    font-size: 14px;
    min-width: 150px;
    text-align: left;
    color: #666666;
}

.classInfo .item div span.sactive, .classInfo .item div span:hover {
    color: #F37B1D;
}

.empty {
    margin: 60px auto 20px;
    width: 206px;
    height: 156px;
    background: url('../../base/images/lesson/tuijian_empty.png') no-repeat;
    background-size: 100% 100%;
}

.empty_text {
    font-size: 14px;
    font-family: PingFangSC-Regular, PingFang SC;
    font-weight: 400;
    color: #999999;
    text-align: center;
}