/* 菜单 */
.tab,
.course-item {
	background: #fff;
}

.tab,
.course-item:hover {
	box-shadow: 0px 1px 30px 0px rgba(0, 0, 0, 0.1);
}

.tab {
	width: 100%;
	margin: 30px 0;
	padding: 6px 0 26px 40px;
	box-sizing: border-box;
}

.top-nav,
.top-nav-list,
.course-box,
.bottom-nav {
	display: flex;
}

.tab-common-all,
.bottom-nav .tab-common:not(:last-child) {
	margin-right: 14px;
}

.tab-common-all,
.top-nav-list .tab-common {
	margin-top: 20px;
}

.top-nav-list {
	width: calc(100% - 114px);
	flex-wrap: wrap;
}

.top-nav-list .tab-common:not(:last-child) {
	margin-right: 29px;
}

.tab-common,
.course-item {
	cursor: pointer;
}

.tab-common {
	width: 100px;
	height: 28px;
	line-height: 28px;
}

.tab-on,
.course-count {
	color: #fff;
}

.tab-on,
.course-count {
	background: #c1191f;
}

.tab-on {
	width: 100px;
	border-radius: 14px;
}

.bottom-nav {
	margin-top: 20px;
}

/* 课程 */
.course-box {
	padding-bottom: 10px;
	flex-wrap: wrap;
	min-height: 500px;
	height: auto;
}

.course-box .course-item:nth-child(4n) {
	margin-right: 0 !important;
}

.course-item {
	margin-right: 28px;
	margin-bottom: 30px;
}

.course-img-box {
	position: relative;
}

.course-item,
.course-img-box,
.course-img {
	width: 279px;
}

.course-item {
	height: 242px;
}

.course-img-box,
.course-img {
	height: 140px;
	border-radius: 6px 6px 0px 0px;
}

.course-count,
.course-count-date,
.course-count-num,
.course-statu {
	font-size: 12px;
}

.course-count,
.course-statu {
	width: 60px;
}

.course-count {
	position: absolute;
	top: 10px;
	left: 10px;
	height: 24px;
	line-height: 24px;
	border-radius: 12px;
}

.course-title,
.course-lect,
.course-count-statu {
	padding: 0 19px;
}

.course-title {
	line-height: 29px;
	margin-top: 9px;
}

.course-lect,
.course-count-date,
.course-count-num {
	color: #505050;
}

.course-lect {
	line-height: 26px;
	font-size: 14px;
}

.course-count-date,
.course-count-num {
	line-height: 13px;
	margin-top: 9px;
}

.course-count-date {
	margin-right: 14px;
}

.course-count-icon {
	width: 12px;
	height: 10px;
	margin-right: 6px;
	margin-top: 10px;
}

.course-statu {
	height: 22px;
	line-height: 22px;
	border-radius: 4px;
}