@media screen and (max-width:768px){
  body{box-sizing:border-box; min-width:auto;}
  .app,body,html{min-width:auto; height:auto;}
  
  .pc_show{display:none;}
  .m_show{display:block;}
  
  #video_logo{display:none;}
  
  .vc-main{width:100%; padding:0px;}
  
  .vc-nav a{width:25%; min-width:auto; margin:0px; box-sizing:border-box;}
  
  .vc-group{width:100%;}
  .vc-group-title{padding-top:16px; padding-left:10px;}  
  .vc-group>ul{height:auto; display:block; min-width:100%;}
  .vc-group>ul li{float:left; width:50%; box-sizing:border-box; margin-right:0px;}
  .vc-group>ul li .imgCover{width:95%; margin:0px auto;}
  .vc-group>ul li .titleCover{width:95%; margin:0px auto; margin-top:8px;}
  .vc-group .vc-timer{width:95%; margin:0px auto; margin-top:8px; display:block;}
}