.main_left{  }
.main_left .nav .item {
  overflow: hidden;
  border-radius: 6px;
  background: #fff;
  box-shadow: 0px 7px 21px 0px rgba(120, 120, 120, 0.07);
}
.main_left .nav .item:not(:first-child) {
  margin-top: 10px;
}
.main_left .nav .item.active .item_control {
  background-image: url(product_nav.png);
}
.main_left .nav .item.active .item_control .item_icon .iconfont {
  -o-transform: rotateZ(90deg);
  -moz-transform: rotateZ(90deg);
  -webkit-transform: rotateZ(90deg);
  transform: rotateZ(90deg);
  color: #ffffff;
}
.main_left .nav .item.active .item_control .item_explain_title,
.main_left .nav .item.active .item_control .item_explain_desc {
  color: #ffffff;
}
.main_left .nav .item .item_control {
  padding: 18px 36px 18px 25px; display:block; width:100%; text-align:left;
  background-color: #f1f4f8;
  border-radius: 6px;
  position: relative;
  -o-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -webkit-transition: all 0.5s;
  transition: all 0.5s;
}
.main_left .nav .item .item_control:hover {
  background-color: #00a0e9;
}
.main_left .nav .item .item_control:hover .item_icon .iconfont {
  color: #ffffff;
}
.main_left .nav .item .item_control:hover .item_explain_title,
.main_left .nav .item .item_control:hover .item_explain_desc {
  color: #ffffff;
}
.main_left .nav .item .item_control .item_icon {
  position: absolute;
  color: #b3b3b3;
  font-size: 18px;
  margin: auto;
  height: 100%;
  right: 10px;
  bottom: 0;
  top: 0;
}
.main_left .nav .item .item_control .item_icon .iconfont {
  -o-transition: all 0.35s;
  -moz-transition: all 0.35s;
  -webkit-transition: all 0.35s;
  transition: all 0.35s;
}
.main_left .nav .item .item_control .item_explain_title {
  font-size: 18px;
  color: #333333;
  -o-transition: color 0.3s;
  -moz-transition: color 0.3s;
  -webkit-transition: color 0.3s;
  transition: color 0.3s;
}
.main_left .nav .item .item_control .item_explain_desc {
  font-size: 14px;
  margin-top: 3px;
  color: #888888;
  -o-transition: color 0.3s;
  -moz-transition: color 0.3s;
  -webkit-transition: color 0.3s;
  transition: color 0.3s;
}
.main_left .nav .item .item_list {
  display: none;
  padding: 15px 20px;
}
.main_left .nav .item .item_list .list_item{ font-weight:normal;
  position: relative;
  border-radius: 6px;
  -o-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -webkit-transition: all 0.5s;
  transition: all 0.5s;
}
.main_left .nav .item .item_list .list_item a{ display:block; text-align:left; line-height: 24px; color: #777777; font-size: 16px; padding: 16px 8px 16px 32px;}
.main_left .nav .item .item_list .list_item:not(:first-child) {
  margin-top: 2px;
}
.main_left .nav .item .item_list .list_item::after {
  content: '';
  position: absolute;
  width: 4px;
  height: 4px;
  background: #a9d0e2;
  left: 18px;
  top: 26px;
}
.main_left .nav .item .item_list .list_item:hover,
.main_left .nav .item .item_list .list_item.active {
  background: #f1f4f8;
  color: #00a0e9;
}
.main_left .nav .item .item_list dd a{ padding:10px 0 10px 40px; text-align:left;display:block; line-height: 20px; color: #777777; font-size: 14px;}
.main_left .nav .item .item_list dd:hover a{ background: #f1f4f8; color: #00a0e9;}


 @media (max-width: 768px) {
.navigation{display: none;}


 }