body{ 
  font-family: PingFangSC-Regular, Microsoft Yahei Light;
  font-weight: 300;
  font-size: 14px;
  line-height: 3.2rem;
  -webkit-text-size-adjust: 100%;
  -moz-osx-font-smoothing: grayscale;
  -webkit-font-smoothing: antialiased;
  background: url(../img/bg.jpg) no-repeat fixed;
  background-size: cover;
}
body{
/*  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;*/
}
body,html { 
	height: 100% ;
	margin:0; 
	padding:0;
}
h3{
	padding:0;
	margin:0;
}
a {
	text-decoration: none;
	transition: all 0.2s ease 0s;
	color:#333;
}
a:hover {
    color: #999;
    text-decoration: none;
	cursor:pointer;
}
a:focus {
    outline: none;
    text-decoration: none;
}
p {
    margin-bottom: 0;
    line-height:1rem;
}
ul,
li,dl,dt,dd{
    margin: 0;
    padding: 0;
    list-style: none;
}
fieldset {
    border: 0 none;
    margin: 0 auto;
    padding: 0;
}
section{
    margin:0;
}
/*.mask{
  position: absolute;
  width: 100%;
  height: 100%;
  top:0;
  left:0;
  z-index: -1;
  background: rgba(9,9,36,0.5) ;
  -webkit-filter: blur(5px);
            -moz-filter: blur(5px);
            -o-filter: blur(5px);
            -ms-filter: blur(5px);
            filter: blur(5px);
}*/
.head{
  width: 100%;
  display: flex;
  justify-content: center;
  background:#fff;
}
.head .container{
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-self: center;
}
.head a.logo{
  line-height: 0;
}
.head .container img{
  width: 90px ;
  height: 90px;
}
.head .container ul{
  flex:1;
  display: flex;
  flex-direction: row;
  justify-content: flex-end;
  align-items: center;
}
.head .container ul li{
  display: inline-block;
  margin:0 0 0 40px;
}
.head .container ul li a{
  font-size:1.125rem/* 18px */;
  display: inline-block;
  color:#333;
  box-sizing: border-box;
  overflow:hidden;
  border-bottom: 3px solid rgba(255,255,255,0)
}
.head .container ul li a:hover,.head .container ul li a.active{
  border-bottom:3px solid #333;
}
.container{
  width: 1280px;
}
.contain{
  flex:1;
  display: flex;
  justify-content: flex-start;
  flex-direction: column;
  align-items: center;
  width: 1280px;
  background:#fff;
  margin:0 auto;
}
.contain h2{
  color:#fff;
  font-size: 4rem/* 64px */;
  margin:30% 0 50px;
}
.contain p{
  margin:0;
}
.footer{
  color:#999;
  text-align: center;
 /* padding: 15px 0 15px; */
  position:fixed;
  width:100%;
  bottom:20px;
}
.downloadLink{
  margin-right: 30px;
  margin-bottom: 20px;
}
 .downloadLink{
  font-size:1rem;
  display: inline-block;
  /*width: 140px;*/
  text-align: center;
  padding:20px 30px;
  border:1px solid #fff;
  background:rgba(255,255,255,0.2);
  border-radius:3px;
}
.downloadLink span{
  display: block;
  margin-bottom: 30px;
}
.downloadLink i{
  margin-right: 10px;
}
video{
	display:block;
	height:100%;
}
.videoMain{
  margin-top:20px;
  padding:20px;
  box-sizing: border-box;
  overflow:scroll;
  scrollbar-width: none; /* firefox */
  -ms-overflow-style: none; /* IE 10+ */
}
.videoMain::-webkit-scrollbar {
  display: none; /* Chrome Safari */
}
.videoList{
  width: 100%;
}
.videoList ul{
  width: 100%;
  display: flex;
  flex-direction: row;
  flex-wrap:wrap;
}
.videoList ul li{
  width: 25%;
  padding:8px;
  box-sizing: border-box;
}
.videoList ul li a{
  display: block;
  width: 100%;
}
.videoCover{
  position: relative;
}
.videoCover img{
  width: 100%;
}
.videoCover em{
  position: absolute;
  bottom: 0;
  right:0;
  color:#fff;
  background:rgba(0,0,0,0.8);
  padding:3px 5px;
  font-size: 12px;
  font-weight: normal;
}
.videoTitle{
  font-size: 1.125rem/* 18px */;
  padding-top:20px;
}
.videoAuthor{
  font-size: .875rem/* 14px */
}
.videoContent{
	width: 100%;
	height:100%;
	/* overflow:hidden; */
}
.videoDetailMain{
	padding-top:10px;
}
.videoDetailMain h4{
    line-height: 32px;
    font-size:1.25rem/* 20px */;
    margin:0;
  }
.videoDetailMain p span{
    display: block;
}
.videoDetailMain p span.author{
  font-size:1rem;
  line-height:32px;
}
.contact_us{
	margin:20px auto;
	justify-content: center;
	align-items: center;
}
.about_us{
	margin:20px auto;
	justify-content: center;
	align-items: center;
}

@media all and (min-width: 300px){
  .contain,.container,.contact_us{
    width: 100%;
  }
  .videoList ul li{
    width: 50%;
  }
  .head .container ul li{
    margin:0 10px;
  }
  .videoTitle{
    line-height: 32px;
  }
  h3{
	  font-size:0.8rem;
	  line-height:1.6rem;
  }
  video{
	  height:auto;
  }
}
@media all and (min-width: 375px){
  .contain,.container,.contact_us{
    width: 100%;
  }
  .videoList ul li{
    width: 50%;
  }
  .head .container ul li{
    margin:0 10px;
  }
  .videoTitle{
    line-height: 32px;
  }
  h3{
  	  font-size:0.8rem;
	  line-height:1.6rem;
  }
  video{
  	  height:auto;
  }
}
@media all and (min-width: 800px){
  .contain,.container,.contact_us{
    width: 1280px;
  }
  .videoList ul li{
    width: 25%;
  }
  .head .container ul li{
    margin:0 10px;
  }
  h3{
	  font-size:25px;
	  line-height:50px;
  }
  video{
	  height:80%;
  }
}