* {
    margin: 0;
    padding: 0;
    font-family: "Microsoft YaHei", "微软雅黑";
}
html,
body {
    background-color: #f7f7f7;
}
.fl,
.f_l,
.pull-left {
    float: left;
}
.fr,
.f_r,
.pull-right {
    float: right;
}
ul {
    list-style-type: none;
}
a {
    text-decoration: none;
}
.clearfix:before,
.clearfix:after {
    content: "";
    display: table;
}
.clearfix:after {
    clear: both;
    overflow: hidden;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
}
.fl,
.f_l,
.pull-left {
    float: left;
}
.fr,
.f_r,
.pull-right {
    float: right;
}
ul {
    list-style-type: none;
}
.top_header {
    height: 40px;
    line-height: 40px;
    background-color: #373737;
    color: #fff;
}
.telphone {
    background: url(/edu/course/images/icon_phone.png) no-repeat left center;
    text-indent: 35px;
}
.top_photo {
    background: url(/edu/course/images/unlogin_photo.png) no-repeat center center / 35px 35px;
    width: 35px;
    height: 35px;
    border-radius: 35px;
    margin-top: 2px;
}
.mobile_version {
    cursor: pointer;
}
.login {
    margin-right: 10px;
    cursor: pointer;
}
.top_split {
    border-right: 1px solid #fff;
    height: 20px;
    margin-top: 10px;
    margin-left: 20px;
    margin-right: 20px;
}
.nav_header {
    height: 115px;
    background-color: #fff;padding-top: 0.1px;
}
.logo {
    background: url(/edu/public/img/logo-index.png) no-repeat left center / 100% auto;
    width: 120px;
    height: 115px;
}
.nav_list {
    margin-left: 50px;
}
.nav_list .nav {
    float: left;
    height: 115px;
    line-height: 115px;
    width: 100px;
    text-align: center;
    cursor: pointer;
}
.nav_list .nav a:hover {
    color: #929292;
}
.nav_list .nav a {
    text-decoration: none;
    color: #505050;
}
.btn_search {
    background: url(/edu/course/images/top_search.png) no-repeat right center / 30px auto;
    cursor: pointer;
    height: 115px;
    width: 50px;
}
.input_wrapper {
    width: 220px;
    height: 30px;
    border-radius: 5px;
    border: 1px solid #d0d0d0;
}
.input_wrapper input[name='search_words'] {
    height: 20px;
    line-height: 20px;
    width: 210px;
    margin: 5px auto;
    text-indent: 10px;
    border: none;
    outline: none;
    -webkit-appearance: none;
}
.top_search .input_wrapper {
    float: right;
    margin-top: 42px;
    width: 220px;
    height: 30px;
    border-radius: 5px;
    border: 1px solid #d0d0d0;
    background-color:transparent;
}
.breadcrumb {
    height: 90px;
    line-height: 90px;
    padding:0;
    margin-left:20px;
    margin-right:20px;
}
a.crumb,
a.crumb:visited {
    color: #505050;
    text-decoration: none;
}
a.crumb:hover,
a.crumb_cur {
    color: #929292;
}
.exam_detail {
    background-color: #fff;
    border-radius: 5px;
    position: relative;
    min-height: 475px;
    margin-bottom: 100px;
}
.exam_detail_left {
    width: 335px;
    height: 335px;
    position: absolute;
    left: 35px;
    top: 70px;
}
.exam_detail_cover {
    width: 300px;
    height: 300px;
    margin-left: 35px;
    margin-top: 35px;
}
.exam_detail_right {
    margin-top: 30px;
    margin-left: 405px;
    margin-right: 70px;
    position: relative;
}
@keyframes music_play {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}
.icon_music_switch_circle {
    animation: music_play 3s linear infinite;
}
.bg_music_stop {
    animation-play-state: paused;
    -webkit-animation-play-state: paused;
    background-image: url(/edu/course/images/icon_bg_music_stop.png);
}
.bg_music {
    width: 40px;
    height: 40px;
    border-radius: 40px;
    display: none;
    cursor: pointer;
    background: url(/edu/course/images/icon_bg_music.png) no-repeat center center / 100% 100%;
    top: 0;
    right: 0;
    position: absolute;
}
.exam_title {
    font-size: 30px;
}
.exam_brief {
    margin-top: 25px;
}
.exam_split_line {
    border-top: 2px dashed #d0d0d0;
    margin-top: 35px;
}
.exam_user {
    margin-top: 30px;
    color: #505050;
}
.exam_user_photo img {
    width: 60px;
    height: 60px;
    border-radius: 60px;
}
.exam_user_name {
    margin-left: 20px;
    margin-top: 30px;
}
.exam_attended_count {
    margin-top: 30px;
    margin-left: 100px;
    background: url(/edu/course/images/attended_count.png) no-repeat left center;
    text-indent: 30px;
}
.exam_attend_btn {
    width: 200px;
    height: 50px;
    line-height: 50px;
    border-radius: 5px;
    text-align: center;
    color: #fff;
    background-color: #00cc99;
    cursor: pointer;
}
.exam_tip {
    border: 1px dashed #d0d0d0;
    margin-top: 30px;
    border-radius: 5px;
    color: #505050;
}
.exam_tip_title {
    font-size: 22px;
    margin-top: 20px;
    padding: 0 10px;
}
.exam_tip_body {
    font-size: 16px;
    padding: 10px;
}
.detail_cover img {
    width: 100%;
    height: 100%;
}
.select_dialog {
    width: 260px;
    padding: 15px;
    background-color: #fff;
    border-radius: 5px;
    color: #929292;
    position: fixed;
    z-index: 1000;
    display: none;
}
.full_mask {
    background-color: rgba(168, 168, 168, 0.6);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
}
.select_dialog a {
    display: inline-block;
    width: 110px;
    height: 45px;
    line-height: 45px;
    margin-top: 10px;
}
.count_down_wrapper .exam_attend_btn {
    background-color: #00afef;
}
.count_down_wrapper .count_down_time {
    text-align: center;
    color: #a5a5a5;
    margin-top: 5px;
}
.flip {
    position: relative;
}
.front,
.back {
    width: 200px;
    height: 80px;
    background-color: #fff;
}
.front {
    position: absolute;
    top: 0;
    left: 0;
    backface-visibility: hidden;
    -moz-backface-visibility: hidden;
}
.back {
    transform: rotateY(-180deg);
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
    backface-visibility: hidden;
    -moz-backface-visibility: hidden;
}
.count_down_wrapper {
    perspective: 1000;
    transform-style: preserve-3d;
    width: 200px;
    height: 80px;
}
.flip {
    transition: 0.6s;
    transform-style: preserve-3d;
}
.back .exam_attend_btn {
    background-color: #f44f44;
}
.count_down_wrapper_flip .flip {
    transform: rotateY(180deg);
}