html {
    background: #ffffff;

    height: 100%;
}
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body, h1, h2, h3, h4, h5, h6, p, blockquote, pre, dl, dd, fieldset, form, input, select, textarea, figure, div, form, img, ul, ol, li, i, b, table, tr, td, th, fieldset, label, legend {
    margin: 0;
    padding: 0;
}

body {
    font-size: 14px;
    font-family: "Microsoft YaHei", "Helvetica Neue", "Hiragino Sans GB", "Segoe UI", Tahoma, Arial, STHeiti, sans-serif !important;
    _font-family: Tahoma, Arial, Helvetica, STHeiti, sans-serif !important;
    color: #333333;
    font-weight: normal;
    font-style: normal;
    height: 100%;
}

p {
    word-break: break-all;
}

ul, ol, menu {
    list-style: none;
    margin: 0;
    padding: 0;
}

input, select, button {
    vertical-align: middle;
    font-family: "Microsoft YaHei";
}

input, textarea, select {
    *font-size: 100%;
    font-family: "Microsoft YaHei";
}
input::-ms-clear{display: none;}

button {
    overflow: visible;
}

a, img, a img {
    border: 0px;
}

a {
    text-decoration: none;
    cursor: pointer;
    color: #333;
}

a:hover {
    text-decoration: none;
    color: #276fb4;
}

input.text, select.text, textarea.text {
    outline: none;
    border: 1px solid #e3e3e3;
    height: 26px;
    line-height: 26px;
    padding: 3px 0px 3px 5px;
    font-size: 12px;
    color: #555;
}

textarea {
    outline: none;
    resize: none;
    border: 1px solid #e3e3e3;
    font-size: 12px;
}

input.check {
    vertical-align: middle;
    margin-right: 2px;
}

img {
    vertical-align: top;
    image-rendering: -moz-crisp-edges;
    image-rendering: -o-crisp-edges;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
    -ms-interpolation-mode: nearest-neighbor;
}

.flt {
    float: left;
}

.frt {
    float: right;
}

.clear {
    height: 0;
    line-height: 0;
    font-size: 0;
    clear: both;
}

.clearfix {
    display: block;
    *zoom: 1;
}

.clearfix:after {
    content: ".";
    display: block;
    height: 0;
    clear: both;
    visibility: hidden;
}

.none {
    display: none;
}

.pagewd {
    width: 1200px;
    margin: 0px auto;
    min-width: 1200px;
}

.scale img {
    transition: All 0.3s ease-in-out;
    -webkit-transition: All 0.3s ease-in-out;
    -moz-transition: All 0.3s ease-in-out;
    -o-transition: All 0.3s ease-in-out;
}

.scale img:hover {
    transform: scale(1.1);
    -webkit-transform: scale(1.1);
    -moz-transform: scale(1.1);
    -o-transform: scale(1.1);
    -ms-transform: scale(1.1);
    opacity: 0.9;
}

.opacity img {
    opacity: 0.9;
    filter: alpha(opacity=90);
}

.opacity img:hover {
    opacity: 1;
    filter: alpha(opacity=100);
}





.course_category_box {
    background-color: #fff;
    /*border: 1px solid #e5e5e5;*/
    border-radius: 2px;
    margin-bottom: 20px;
    margin-top: 20px;
    padding: 20px;
    box-sizing: border-box;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.category_row {
    display: flex;
    position: relative;
    font-size: 16px;
    margin-top: 10px;
}

.label {
    float: left;
    color: #666;
    margin-right: 30px;
}

.all {
    color: #999;
    margin-right: 30px;
    text-decoration: none;
    color: inherit;
    align-self: start;
    padding: 1px 8px;
    border-radius: 2px;
    height: 24px;
}

.category_row .category_list {
    flex: 1;
    /*border-top: 1px solid #e5e5e5;*/
    /*padding-top: 15px;*/
}

/*         .category_row+.category_row .category_list {
            padding-top: 15px;
            border-top: 1px solid #e6e6e6;
            max-height: 65px;
            overflow: hidden;
        }*/
.category_row + .category_row .category_list {
    border-top: 1px solid #f1f1f1;
    padding-top: 15px;
    max-height: 65px;
    overflow: hidden;

}

.category_row + .category_row .all, .category_row + .category_row .label {
    margin-top: 15px;
}

.category_row .category_list:first-child {
    border-top: none;
}

.category_list li {
    display: inline-block;
    vertical-align: top;
    margin-right: 12px;
    margin-bottom: 5px;
}

.category_list li a {
    color: #111;
    padding: 2px 8px 3px 8px;
}

.all.active, .category_list li.active a {
    color: #999;
    background-color: #177dff;
    color: #fff;
}

.category_list li:hover a {
    color: #177dff;
}

.category_list li.active:hover a {
    color: #fff;
}

.filter-bar {
    background: #fff;
    border: 1px solid #e5e5e5;
    border-radius: 2px;
    padding: 15px 30px;
    margin-bottom: 20px;
}

.filter-bar, .filter-bar .more {
    display: flex;
    align-items: center;
}

.filter-bar .more {
    border-left: 1px solid #d8d8d8;
    line-height: 18px;
    padding-left: 40px;
}

.filter-bar .main .active {
    color: #177dff;
}

.custom-control {
    position: relative;
    display: block;
    /*min-height: 1.5rem;*/
    padding-left: 15px;
}

input[type=checkbox], input[type=radio] {
    display: none;
}

input[type=checkbox] + label:before {
    content: "";
    color: transparent;
    display: inline-block;
    border: 1px solid #e6e6e6;
    font-size: 15px;
    line-height: 15px;
    margin: 0px 5px 0 0;
    /* height: 20px;
     width: 20px;*/
    height: 15px;
    width: 15px;
    text-align: center;
    vertical-align: middle;
    transition: color ease .3s;
}

input[type=checkbox]:checked + label:before {
    /*color: #177dff;*/
    border: 1px solid #177dff;
    content: "\2713";
    color: #fff;
    background-color: #177dff;

}

.custom-control:hover input[type=checkbox]:checked + label:before {
    border: 1px solid #177dff;
    content: "\2713";
    color: #fff;
    background-color: #177dff;
}

.custom-control:hover label {
    color: #177dff;
}

.custom-control:hover input[type=checkbox] + label:before {
    color: #177dff;
    border: 1px solid #177dff;
    /*content: "";*/
}

.custom-control:hover input[type=checkbox] + label {
    color: #177dff;
}

.filter-bar .more label {
    display: inline-flex;
    align-items: center;
    margin-right: 20px;
    margin-bottom: 0;
}

.custom-control-label {
    margin-top: 1px;
    position: relative;
    margin-bottom: 0;
    vertical-align: top;
    line-height: 18px;

}
.empty_box {
    /*display: none;*/
    padding: 20px 0;
    text-align: center;
    background: #fff;
    border: 1px solid #e5e5e5;
    border-radius: 2px;
}

.empty_box img {
    width: 170px;
    padding-top: 20px;
}

.empty_box .desc {
    color: #999;
    margin: 20px 0;
    font-size: 14px;
}

.course_list_box {
    margin-top: 20px;
    margin-left: -12px;
    margin-right: -12px;
}

.course_item {
    width: 25%;
    padding: 0 12px;
    box-sizing: border-box;
    margin-bottom: 20px;
}

.course_item_inner {
    border-radius: 8px;
    overflow-y: hidden;
    background: #fff;
    width: 100%;
    /*height: 246px;*/
    height: 270px;
    transition: all ease 0.3s;
    /*overflow: hidden;*/

}

.course_item_inner:hover {
    transform: translateY(-5px);

    box-shadow: 0 9px 28px 6px hsl(0deg 0% 60% / 5%), 0 6px 16px 0 hsl(0deg 0% 60% / 8%), 0 3px 6px -4px hsl(0deg 0% 60% / 12%);
}

.course_item_inner:hover .mask {
    opacity: 1;
}

.course_item_inner:hover .title {
    color: #177dff;
}

.cover_box {
    width: 100%;
    height: 158px;
    position: relative;
    overflow: hidden;
}
.cover_box:after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.2) 50%, transparent 70%);
    pointer-events: none;
    display: none;
}
.course_item_inner:hover .cover_box:after {
    animation: shimmer 1.5s 1;
    display: block;

}
@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.cover_box img {
    display: block;
    object-fit: cover;
    width: 100%;
    height: 100%;
}

.cover_box .mask {
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    position: absolute;
    /*background: #fff;*/
    /*opacity: 0;*/
    transition: all .3s ease-in-out;
}

.cover_box .lesson_info {
    position: absolute;
    font-size: 14px;
    font-weight: 500;
    color: #fff;
    width: 100%;
    height: 32px;
    background: linear-gradient(180deg, transparent, rgba(0, 0, 0, .6));
    box-shadow: 0 6px 16px 0 rgb(121 128 132 / 30%);
    border-radius: 1px;
    right: 0;
    bottom: 0;
    line-height: 32px;
    text-indent: 210px;
}

.course_item_bottom {

}

.course_item_bottom .title {
    width: 100%;
    box-sizing: border-box;
    padding: 16px 16px 0;
    font-size: 16px;
    font-weight: 700;
    color: #333;
    overflow: hidden;
    text-overflow: ellipsis;
    word-break: break-all;
    white-space: nowrap;
    transition: color ease 0.3s;
}

.course_item_bottom .mode {
    padding: 12px 16px 0;
    color: #888;
}
.course_item_bottom .price {
    display: flex;
    box-sizing: border-box;
    padding: 8px 16px 0;
    justify-content: space-between;
    align-items: center;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    color: #e03b00;

}
.pointer{
    cursor: pointer;
}