html,
body,
ul,
li,
dl,
dt,
dd {
  margin: 0;
  padding: 0;
}

a {
  text-decoration: none;
}

ul,
ol,
li {
  list-style: none;
}

.center {
  width: 1200px;
  margin: 0px auto;
}

.flex-center {
  display: flex;
  align-items: center;
}

h1.page-title {
  color: #111;
  font-size: 36px;
  font-weight: bold;
  line-height: 1em;
  margin: 0px;
  text-align: center;
  letter-spacing: 2px;
}

/* banner */
.banner > img{
 display: block;
 width: 100%;
 min-width: 1200px;
}

/* 课程资源介绍 */
.resources{
	padding-bottom: 30px;
}
.resources .page-title{
 margin: 88px auto 43px;
}
.resources-introduce{
 padding-bottom: 32px;
}
.resources-title{
 margin-bottom: 28px;
}
.resources-title > h3{
 margin: 0px;
 padding: 3px 0px 3px 18px;
 border-left: 6px solid #005CB5;
 box-sizing: border-box;
 font-size: 24px;
 color: #111;
 line-height: 1em;
}

.resources-title > a,.resources-title > a:hover,.resources-title > a:visited{
 display: block;
 margin-left: auto;
 color: #333;
 font-size: 16px;

}
.resources-list{
 display: flex;
 flex-wrap: wrap;
 /* overflow: hidden; */
}
.resources-list > .resources-item:nth-child(4n){
 margin-right: 0px;
}
.resources-item{
 width:270px ;
 height: 282px;
 margin-right: auto;
 margin-bottom: 40px;
 border-top-left-radius: 12px;
 border-top-right-radius: 12px;
 overflow: hidden;
 box-shadow: 0px 11px 15px 1px rgba(42,42,42,.1);
}
.resources-item > img{
 display: block;
 width: 100%;
 height: 152px;
}
.resources-detail{
 padding: 24px 10px 0px;
 box-sizing: border-box;
}
.resources-detail > h5{
  height:66px;
  line-height: 33px;
 margin: 0px;
 color: #222;
 font-size: 16px;
 /* white-space: nowrap;
 text-overflow: ellipsis;
 overflow: hidden; */
}
.resources-detail > .study-num{
 line-height: 1em;
 color: #666;
 font-size: 12px;
 margin: 17px 0px 6px;
}
.resources-price{
 display: flex;
 align-items: flex-end;
}
.resources-price>span{
 margin-bottom: 5px;
}
.resources-price>span:first-child{
 width: 4.5em;
 color: #FF0000;
 font-size: 16px;
}
.resources-price>span:nth-child(2){
 color: #666;
 font-size: 12px;
 text-decoration: line-through;
}
.resources-price > a{
 display: block;
 width: 90px;
 height: 30px;
 color: #005CB5;
 font-size: 14px;
 text-align: center;
 line-height: 30px;
 border: 1px solid #005CB5;
 border-radius: 4px;
 margin-left: auto;
}
.resources-price > a:hover{
 background-color: #005CB5;
 color: #FFF;
}

.resources-price > a:active{
 box-shadow: inset 0px 0px 15px rgba(0,0,0,.3);
}


/* 学习安全知识，提升安全技能 */
.tips{
 position: relative;
 min-width: 1200px;
}
.tips>img{
 display: block;
 width: 100%;
}
.tips>p{
 margin: 0px;
 line-height: 1em;
 font-size: 40px;
 letter-spacing: 3px;
 text-align: center;
 color: #FFF;
 position: absolute;
 top: 50%;
 left: 50%;
 transform: translate(-50% ,-50%);
}