header {
	position: fixed;
	width: 100%;
	height: 72px;
	top: 0px;
	left: 0px;
	z-index: 2;
	background-color: #fff;
	border-bottom: thin solid #ededee;
}

.empty_header {
	height: 72px;
}

nav {
	position: relative;
	display: flex;
	-webkit-align-items: center;
	align-items: center;
	justify-content: space-between;
	height: 72px;
	width: 1180px;
	margin: auto;
}
nav>ul{
	display: flex;
	-webkit-align-items: center;
	align-items: center;
}
nav>ul>li {
	position: relative;
	font-size: 20px;
	margin-left: 40px;
	padding: 26px 0;
}
.active_nav,.active_nav a{
	color:#319EFF ;
}
.active_nav{
	background-image: url(../img/underline.png);
	background-repeat: no-repeat;
	background-position: 2px 60px;
	//background-position: bottom;
}
nav>ul>li:hover,nav>ul>li>a:hover  {
	color: #319eff;
}
.login,.register,.nickname,.avatar{
	display: none;
}
nav ul .login,
nav ul .register {
	border: thin solid #319EFF;
	padding: 7px 20px;
	border-radius: 20px;
	cursor: pointer;
}
nav ul .login:hover,
nav ul .register:hover {
	background-color: #319EFF;
	color: #fff;
}
nav ul .register {
	margin-left: 12px;
}
nav ul .logo {
	margin-left: 0px;
	padding: 0px;
	height: 42px;
}
.avatar div{
	width: 44px;
	height: 44px;
	background-repeat: no-repeat;
	background-size: cover;
	border-radius: 22px;
	cursor: pointer;
}
.nickname{
	position: relative;
	margin-left: 10px;
	padding-right: 20px;
	background-image: url(../img/down_arrow.png);
	background-repeat: no-repeat;
	background-position: right;
	cursor: pointer;
}
.nickname i{
	position: absolute;
	right: 13px;
	top: 20px;
	text-align: center;
	min-width: 15px;
	line-height: 15px;
	font-size: 12px;
	color: #fff;
	padding: 0 3px;
	border-radius: 8px;
	background-color: red;
}
.nickname:hover{
	color: #000;
}

.choose_course .course_select {
	left: -223px;
}

.information .course_select {
	left: -383px;
}

.course_select {
	position: absolute;
	display: none;
	z-index: 3;
	width: 1180px;
	height: 600px;
	top: 72px;
	right: -500px;
	background-color: rgba(0, 0, 0, 0.8);
	padding: 0px 50px 50px 50px;
	cursor: default;
	overflow: auto;
}

.news_select {
	position: absolute;
	display: none;
	z-index: 3;
	width: 200px;
	top: 72px;
	left: -15px;
	background-color: rgba(0, 0, 0, 0.8);
}
.news_select li:hover{
	color:#319EFF;
}
.news_select li{
	font-size: 14px;
	padding:10px 0 10px 15px;
	color:#fff;
	border-bottom:thin solid #999;
}
.news_select li:last-of-type(1){
	border-bottom:none;
}
.category {
	margin-top: 32px;
}

.category p,
.category ul,
.category ul li {
	display: inline-block;
	vertical-align: top;
}

.category p {
	width: 185px;
	font-size: 17px;
	line-height: 32px;
	background-color: #fff;
	border-radius: 15px;
	text-align: center;
	margin-right: 40px;
	overflow: hidden;
	white-space: nowrap;
	text-overflow: ellipsis;
	-o-text-overflow: ellipsis;
}

.category p {
	color: #000;
}

.category ul {
	width: 800px;
}

.category ul li {
	color: #fff;
	font-size: 14px;
	margin-right: 25px;
	margin-top: 11px;
}

.category ul li a {
	color: #fff;
}

.category ul li a:hover {
	text-decoration: underline;
}


.nav_list{
	position: absolute;
	z-index: 4;
	width: 180px;
	display: none;
	top: 73px;
	right: 0px;
}
.nav_list ul{
	background-color: #fff;
	//border: thin solid #eee;
	box-shadow: 1px 1px 1px #eee,-1px -1px 1px #eee;
}
.nav_list > img{
	margin-left: 37px;
}
.nav_list ul li{
	position: relative;
	padding: 10px 0;
	cursor: pointer;
	font-size: 14px;
}
.nav_list ul li:hover{
	background-color: #eee;
}
.nav_list ul a:last-of-type li{
	border-top: thin solid #ececec;
}
.nav_list ul li img,.nav_list ul li span{
	display: inline-block;
	vertical-align: middle;
}
.nav_list ul li img{
	margin: 0 17px;
}
.order_msg{
	position: absolute;
	top: 10px;
	right: 30px;
	text-align: center;
	font-size: 12px;
	min-width: 15px;
	line-height: 15px;
	padding: 0px 3px;
	border-radius: 9px;
	background-color: red;
	color: #fff;
}