.outside_case {
	background-color: rgba(0, 191, 242, 0.2);
	width: 100%;
	padding: 80px 0px;
}


/***********************限制宽为1170px*********************************/

.characteristic_case {
	width: 1170px;
	margin: 0 auto;
	margin-bottom: 200px;
	font-size: 24px;/*特征上半部分的字体样式*/
	font-weight: 400;
	font-style: normal;
	text-decoration: none;
	font-family: "微软雅黑";
	color: rgb(54, 54, 54);
}

.topic {
	height: 68px;
	font-size: 50px;
	font-weight: 700;
	margin: 50px 0px;
}

.littletopic {
	
	font-weight: 700;
	margin-top: -35px;
}

.topic_text {
	margin-top: -40px;
	margin-bottom: 60px;
}

.characteristic_leftbox {
	height: 1000px;
}

.characteristic_rightbox {
	position: absolute;
	/*top: 568px;*/
	height: 1000px;
	margin-left: 66px;
}

/***********************characteristic*********************************/

.characteristic_box {
	background-color: rgb(255, 255, 255);
	border-radius: 20px;
	width: 550px;
	display: inline-block;
}

.characteristic_topic_text {
	margin-top: 30px;
	margin-bottom: 60px;
}

.characteristic_box_pic {
	width: 480px;
	margin: 20px auto;
	padding-top: 50px;
}

.characteristic_box_pic img {
	width: 480px;
}

.characteristic_box_topic {
	width: 50px;
	margin: 0 auto;
	font-weight: 700;
}

.characteristic_box_text {
	width: 420px;
	margin: 20px auto;
}

.characteristic_box_link {
	width: 420px;
	margin: 10px auto;
}

.characteristic_box_link a {
	text-decoration: none;
	color: rgb(0, 107, 159);
}

.characteristic_box_heightlinelink a {
	text-decoration: none;
	color: rgb(28, 42, 83);
	font-weight: 700;
}

.characteristic_mathworldbox {
	width: 1170px;
	margin: 0 auto;
	font-size: 24px;/*整体的字体样式 不能删除*/
	font-style: normal;
	text-decoration: none;
	font-family: "微软雅黑";
	background-color: rgb(255, 255, 255);
}

.mathworldhouse_pic {
	float: left;
	width: 220px;
	height: 200px;
	margin: 40px 40px 20px 40px;
	display: inline-block;
}

.characteristic_mathworldbox .topic {
	width: 200px;
	height: 50px;
	font-size: 40px;
	padding-top: 90px;
	display: inline-block;
}

.characteristic_mathworldbox .topic_text {
	width: 800px;
	font-weight: 700;
	margin-top: 80px;
	margin-left: 110px;
}

.characteristic_mathworldbox .iipic1 {
	width: 850px;
	margin: 30px 90px;
	text-align: center;
}

.characteristic_mathworldbox .iipic1 img {
	width: 660px;
}

.characteristic_mathworldbox .ii-Intelligence {
	width: 800px;
}

.characteristic_mathworldbox .ii-Intelligence .topic {
	width: 950px;
	font-weight: 700;	
	margin: 0 auto;
	margin-left: 110px;
}

.characteristic_mathworldbox .ii-Intelligence .content {
	width: 600px;
	margin-left: 110px;
	margin-top: -120px;
}

.characteristic_mathworldbox .ii-Intelligence img {
	margin-left: 775px;
	margin-top: 55px;
}

.characteristic_mathworldbox .course_content .content {
	width: 630px;
	margin-top: -150px;
}

.characteristic_mathworldbox .course_content img {
	width: 220px;
	position: relative;
	top: -40px;
}

.characteristic_mathworldbox_text {
	width: 850px;
	margin: 30px 0;
	margin-left: 110px;
	margin-top: 80px;
}

.exercise {
	width: 400px;
	height: 650px;
	margin-left: 110px;
	margin-top: -20px;
	display: inline-block;
	vertical-align: top;
}

.characteristic_mathworldbox .exercise .topic {
	margin-left: 0px;
	margin-bottom: -10px;
	padding-top: 0px;
}

.characteristic_mathworldbox .exercise .content {
	width: 400px;
	height: 140px;
	margin: 30px auto;
}

.characteristic_mathworldbox .exercise .pic {
	width: 400px;
	height: 308px;
	margin: 160px auto;
	text-align: center;
}

.characteristic_mathworldbox .exercise img {
	width: 350px;
	height: 252px;
}

.challenge {
	margin-left: 10px;
}

.jingdu_topic {
	padding-top: 150px !important;
}

#jingdu_text {
	margin-top: 10px;
}

#jingdu_pic {
	width: 800px;
	text-align: center;
	margin: 30px 120px;
	margin-bottom: 0px;
	padding-bottom: 200px;
}

#jingdu_pic img {
	margin-top: 0px;
	margin-left: 0px;
}


/***********************exploration*********************************/

#exploration_content {
	width: 800px;
	margin: 30px auto;
	margin-left: 110px;
	margin-top: 70px;
	font-weight: 400;
}

.exploration_pic {
	width: 800px;
	text-align: center;
	margin-left: 110px;
	padding-bottom: 150px;
}

.exploration_pic img {
	margin: 30px 0px;
}

#prize_text1 {
	width: 800px;
	margin: 30px auto;
	margin-top: 70px;
	margin-left: 110px;
	font-weight: 700;
}

#prize_text2 {
	width: 800px;
	margin-top: 30px;
	margin-left: 110px;
	margin-bottom: 0px;
	font-weight: 400;
}

#prize_pic {
	width: 750px;
}

#rank_topic {
	margin-left: 110px;
}
#rank_text1 {
	width: 800px;
	margin: 30px auto;
	margin-left: 110px;
	font-weight: 700;
}
.rankPic{
	margin: 40px auto !important;
}

.practicePicDiv {
	width: 800px;
	text-align: center;
	margin-left: 110px;
	margin-top: 50px;
	padding-bottom: 20px;
}

#practice_pic {
	width: 600px;
}

#practiceTriangle {
	background-color: rgba(0, 0, 0, 0);
	pointer-events: none;
	font-family: jdIcoFont;
	color: rgb(255, 204, 102);
	text-align: center;
	line-height: 24px;
	margin-right: 10px;
}


/* 右边导航栏 */

a {
	color: black;
	font-weight: 400;
}

.nav>li {
	display: list-item;
}

.nav-tabs {
	border-bottom: none;
}

ul.nav-tabs {
	/*width: 140px;*/
	margin-top: 20px;
	border-left: 1px solid #ddd;
}

ul.nav-tabs li {
	margin: 0;
	list-style-type: disc;
	margin-left: 13px;
}

ul.nav-tabs li:first-child {
	border-top: none;
}

ul.nav-tabs li a {
	margin: 0;
}

/*滚动时所在标签的样式*/
ul.nav-tabs li.active a,
ul.nav-tabs li.active a:hover,ul.nav-tabs li.active {
	color: #0088cc;
	text-align: left;
	list-style: url(/images/planetii/mathworld/menuarrow.png);
	border: none;
}

.nav-tabs>li.active>a,
.nav-tabs>li.active>a:focus,
.nav-tabs>li.active>a:hover {
	background-color: transparent;
	border: transparent;
	color: #337ab7;
}

/*鼠标悬浮在上面时的样式*/
.nav>li>a:focus,
.nav>li>a:hover {
	background-color: transparent !important;
	border: transparent;
}

.col-xs-2 ul li a:hover {
	background-color: transparent !important;
	border: none;
	color: #337ab7;
}

ul.nav-tabs.affix {
	top: 30px;
}
.nav>li>a{
	width:90px ;
	padding-left: 0px;
	padding-right: 0px;
}
.col-xs-2 {
	float: right;
	width: 12.666667%;
	padding-left: 0px;
}

/*返回顶部*/
.back_to_top{
	width: 40px;
	height: 40px;
	line-height: 50px;
	border-radius: 5px;
	margin-left:10px;
	margin-top: 10px;
	border:1px solid #d5d5d5;
}
.back_to_top:hover{
	cursor: pointer;
}
.back_to_top span{
	width: 40px;
	color: #aaa;
	font-size: 26px;
	text-align: center;
}