.flex{
  display: flex;
}
.flex-middle{
  display: flex;
  align-items: center;
}
.flex-between{
  display: flex;
  justify-content: space-between;
}
.flex-around{
  display: flex;
  justify-content: space-around;
}
.flex-between-middle{
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.flex-around-middle{
  display: flex;
  justify-content: space-around;
  align-items: center;
}
.flex-center-middle{
  display: flex;
  justify-content: center;
  align-items: center;
}
.flex-center-middle-column{
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

.flex-center-bottom{
  display: flex;
  justify-content: center;
  align-items: flex-end;
}
.inline-block{
  display: inline-block;
}
.align-middle{
  display: flex;
  justify-content: flex-start;
  align-items: center;
}

/* 头部 */
#header-nav-wrap{
  width: 100vw;
  height: 74px;
  background: rgba(0,0,0,0.5);
  box-shadow: 0px 2px 9px 0px rgba(0,0,0,0.03);
  position: fixed;
  top: 0;
  left: 0;
  z-index: 999;
  transition: all 0.5s;
}
.header-nav-wrap-white{
  background: rgba(255,255,255,0.5) !important;
}
.header-nav-wrap-white #header-nav ul li{
  color: #333 !important;
}
#header-nav{
  width: 1200px;
  margin: 0 auto;
  height: 100%;
}
#logo{
  width: 156px;
  height: 28px;
  margin-right: 70px;
  position: relative;
  top: -5px;
  cursor: pointer;
}
#header-nav ul li{
  margin-right: 60px;
  height: 74px;
  line-height: 74px;
  transition: all 0.1s;
  color: #fff;
}
#header-nav ul li a{
  transition: all 0.1s;
  display: block;
  width: 100%;
  height: 100%;
}
#header-nav ul .select a , #header-nav ul li:hover a{
  color: #3196FA;
}
#header-nav ul .select , #header-nav ul li:hover{
  border-bottom: 3px solid #3196fa;
}
#header-nav .btn{
  width: 100px;
  height: 40px;
  border-radius: 4px;
  line-height: 40px;
  text-align: center;
  display: inline-block;
  font-weight: 500;
  cursor: pointer;
}
.btn-blue{
  background: #3196fa;
  box-shadow: 0px 4px 6px 0px rgba(40,107,239,0.35); 
  color: #fff;
}
#header-nav .btn-border-blue{
  border: 1px solid #3196fa;
  box-shadow: 0px 4px 6px 0px rgba(40,107,239,0.35); 
  color: #3196FA;
}
#header-nav .exit{
  color: #0065f7;
}
#header-nav .company{
  text-decoration: underline;
}

/* 底部 */
#footer{
  width: 100vw;
  height: 357px;
  margin: 0 auto;
  background-color: #05080a;
}
#footer .bottom{
  height: 80px;
  width: 100%;
  border-top: 1px solid #3c3c3c;
  line-height: 80px;
  text-align: center;
}
#footer .bottom .margin{
  margin: 0 60px 0 75px;
}
#footer .top{
  height: 276px;
  width: 1200px;
  margin: 0 auto;
}
#footer .top .footer-logo{
  width: 100px;
  height: 48px;
}
#footer .top .qrcode{
  width: 100px;
  height: 100px;
  margin-top: 16px;
}
#footer .top ul li{
  opacity: 0.85;
}
#footer .top ul .title{
  margin-bottom: 24px;
  opacity: 1;
}
#footer .top ul li{
  margin-bottom: 12px;
}

#footer .top .left{
  margin: 0 80px;
}

/* 头部 */
.header{
  width: 100vw;
  height: 707px;
  background-color: #0b0e18;
  background-image: url(../img/home/header-bg.png);
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
}
.header .btn{
  width: 120px;
  height: 48px;
  line-height: 48px;
  text-align: center;
  font-weight: 500;
  cursor: pointer;
  border-radius: 4px;
  margin-top: 44px;
}
.header p{
  opacity: 0.82;
}
.btn{
  cursor: pointer;
}