.banner{
  background: url('../images/help-center/banner_bg.jpg') no-repeat;
  background-size: cover;
  background-position: center center;
}
@media (max-width: 768px){
  .banner {
    background: url('../images/help-center/banner_bg_m.jpg') no-repeat;
    background-size: 100% 100%;
  }
}

.main{
  background: url('../images/help-center/clouds_bg.png') no-repeat left bottom;
  background-size: 100% 814px;
}

/* 搜索 */
.search_sec{
  padding:112px 0 100px;
}
@media(max-width:768px){
  .main{
    background: #fff;
  }
  .search_sec{
    padding:58px 0;
  }
}
.row_not_margin{
    /* 重置row margin */
  margin: 0;
} 
.form_group{
  padding: 8px 8px 8px 18px;
  border:1px solid #D8D8D8;
  height: 50px;
  border-radius: 26px;
  align-items: center;
}
.form_group .search_icon{
  width: 24px;
  height: 24px;
  background: url('../images/help-center/search_icon.png') no-repeat;
  background-size: contain;
  margin-right: 10px;
}
.form_group .form_input{
  flex:1;
  color:#333;
  height: 40px;
  line-height: 40px;
}
/* nav */
.hc_nav_menu .hc_nav_item{
  margin-bottom: 28px;
  padding: 28px;
  border-radius:10px;
  transition: all .3s ease-out;
}
.hc_nav_item .icon_box{
  width: 44px;
  height: 44px;
  margin-right: 28px;
}
.hc_nav_item img{
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.hc_nav_item .title{
  line-height:28px;
}
.hc_nav_item .introduce{
  margin-top: 4px;
  color:#507390;
  line-height: 22px;
}
@media( min-width:992px ){
  .hc_nav_menu .hc_nav_item:hover,
  .hc_nav_menu .hc_nav_item.active{
    box-shadow:0px 10px 20px 0px rgba(0,148,219,0.1);
  }
}
@media( max-width:992px ){
  .dropdown{
    box-shadow:0px 5px 10px 0px rgba(0,148,219,0.1);
    border-radius:10px;
    padding:0 15px;
    overflow: hidden;
    position: relative;
    margin-bottom: 28px;
  }
  .dropdown .iconfont{
    position: absolute;
    right: 10px;
    top:50%;
    font-size: 20px;
    transform: rotate(180deg) translateY(-50%);
    transform-origin:50% 0;
    -webkit-transform-origin:50% 0;
    transition: all .3s ease-in-out;
    color:#00A6FD;
  }
  .dropdown .select_item{
    height: 100%;
  } 
  .dropdown .select_item .icon_box{
    width: 30px;
    height: 30px;
    margin-right: 12px;
  }

  .dropdown .select_item img{
    width: 100%;
    height: 100%;
    object-fit: contain;
  }

  .hc_nav_menu .hc_nav_item,
  .dropdown .selLabel{
    padding: 0;
    margin: 0;
    height: 52px;
    justify-content: center;
    border-radius: 0;
    border-bottom:1px solid #D8D8D8;
    background: #fff;
  }
  .dropdown .selLabel{
    display: block;
    border:none;
    position: relative;
    transition: border .3s ease-in-out;
    border-bottom:1px solid #fff;
  }
  .dropdown.active .selLabel{
    border-color:#D8D8D8;
  }

  .dropdown.active .iconfont{
    transform: rotate(0deg) translateY(-50%);
    -webkit-transform: rotate(0deg) translateY(-50%);
  }

  .hc_nav_menu .hc_nav_item:last-child{
    border:none;
  }
  .hc_nav_item .icon_box{
    width: 30px;
    height: 30px;
    margin-right: 12px;
  }
  .hc_nav_item .introduce{
    display: none;
  }
}

/* issue menu */
.issue_menu_box{
  margin-bottom: 40px;
}
.issue_menu_box .issue_title{
  color:#00A6FD;
}
.issue_menu_box .issue_menu{
  margin-top:6px;
}
.issue_iem .card_header{
  border-bottom: 1px solid #D8D8D8;
}
.issue_iem .issue{
  line-height: 22px;
  padding: 16px 6px 16px 0;
  position: relative;
}
.issue_iem .card_body{
  background: #F0F6FA;
  line-height:18px;
  padding: 12px 20px;
  overflow: hidden;
}
.issue_iem .card_body img{
  max-width: 100%;
}
.issue_iem .card_body a{
  color:#00A6FD;
  text-decoration: underline;
}

.issue .toggle_icon{
  margin-left: 10px;
  flex-shrink:0;
  display: inline-block;
  width: 28px;
  height: 28px;
  border:1px  solid #66C7F2;
  border-radius: 50%;
  vertical-align: bottom;
  position: relative;
}
.issue .toggle_icon::after{
  content:'';
  display: block;
  position: absolute;
  top:50%;
  left:50%;
  transform: translate(-50%,-50%);
  width: 16px;
  height: 2px;
  border-radius: 4px;
  background: #66C7F2;
  transform-origin:50% 0;
}

.issue .toggle_icon::before{
  content:'';
  display: block;
  position: absolute;
  top:50%;
  left:50%;
  transform: translate(-50%,-50%);
  width: 2px;
  height: 16px;
  border-radius: 4px;
  background: #66C7F2;
  transform-origin:50% 0;
  transition: all 0.3s ease;
  opacity: 0;
}
.issue.collapsed .toggle_icon::before{
  opacity: 1;
}
/* 联系人工客服 */
.customer_service_sec{
  text-align: center;
  padding: 72px 0 112px;
}
.customer_service_sec .contact_btn{
  display: inline-block;
  background:#00A6FD;
  padding: 0 28px;
  height: 36px;
  line-height: 36px;
  border-radius:20px;
  margin: 28px 0 32px;
  color:#fff;
  transition: all .3s ease-in-out;
}
.customer_service_sec .contact_btn:hover{
  background: #38bbff;
}
.customer_service_sec .title,
.customer_service_sec .hint{
  color:#507390;
}
.customer_service_sec .title{
  line-height:40px;
}
.customer_service_sec .hint{
  line-height: 22px;
}

@media(max-width:768px){
  .customer_service_sec{
    padding: 18px 0 28px;
  }
  .customer_service_sec .title{
    font-size: 20px;
  }
}