.tier-nav-wrap {
    display: none;
  }
  
  @-webkit-keyframes returnToNormal {
    0% {
      opacity: 0;
      -webkit-transform: translate3d(0, -100%, 0);
      transform: translate3d(0, -100%, 0);
    }
    100% {
      opacity: 1;
      -webkit-transform: none;
      transform: none;
    }
  }
  
  @keyframes returnToNormal {
    0% {
      opacity: 0;
      -webkit-transform: translate3d(0, -100%, 0);
      transform: translate3d(0, -100%, 0);
    }
    100% {
      opacity: 1;
      -webkit-transform: none;
      transform: none;
    }
  }
  
  @media only screen and (min-width: 100px) and (max-width: 750px) {
    .tier-nav-wrap {
      display: block;
      position: relative;
      width: 100%;
      top: 0rem;
    }
    .tier-nav-wrap .goback_mob{
      position: absolute;
      left: 4%;
      top: 0;
      height: 100%;
    }
    .tier-nav-wrap .goback_mob img{
      display: block;height: 55%;
    position: relative;
    top: 20%;
    }
    .tier-nav {
      height: 0.96rem;
      border-bottom: 1px solid #eaeaea;
      box-sizing: border-box;
      padding-left: 0.32rem;
      padding-right: 0.32rem;
      line-height: 0.96rem;
      position: static;
      z-index: 99999;
      width: 100%;
      background: white;
    }
    .tier-nav a {
      /*float: left;*/
      color: #231816;
      font-weight: bold;
      display: block;
      text-align: center;
    }
    .tier-nav span {
      display: block;
      width: 16px;
      margin: 0 auto;
      cursor: pointer;
      /*float: right;*/
      position: absolute;
      right: 4%;
      top: 0;
    }
    .tier-nav_bg{
      position: absolute;
      min-height: 48px;
      position: absolute;
      left: 0;
      top: 0;
      width: 100%;
      height: 100%;
      z-index: -1;
    }
    .tier-menu_nr {
      max-height: 0;
      width: 100%;
      box-sizing: border-box;
      background: white;
      overflow: hidden;
      visibility: hidden;
      transition: max-height 0.5s cubic-bezier(0.28, 0.11, 0.32, 1) 0.4s,visibility 0s linear 1s;
position: absolute;
    }
    .tier-menu_nr.cur{
      -webkit-overflow-scrolling: touch;
      overflow: auto;
      max-height: calc(100vh - 48px - 48px);
      max-height: -ms-calc(100vh - 48px - 48px);
      max-height: -moz-calc(100vh - 48px - 48px);
      max-height: -o-calc(100vh - 48px - 48px);
      max-height: -webkit-calc(100vh - 48px - 48px);
      visibility: visible;
      transition-delay: 0.2s,0s;
    }
    .tier-menu_nr .tier-menu{
      transition: opacity 0.7s cubic-bezier(0.23, 1, 0.32, 1) 0.2s,-webkit-transform 1s cubic-bezier(0.23, 1, 0.32, 1) 0.5s;
      opacity: 0;
      transform: translate3d(0, -150px, 0);
    }
    .tier-menu_nr.cur .tier-menu{
      opacity: 1;
      transform: translate3d(0, 0, 0);
      transition-delay: 0.2s, 0.4s;
    }
    .tier-menu li {
      opacity: 0;
      transition: 0.5s ease;
      transform: translate3d(0, -25px, 0);
      height: 1.2rem;
      border-bottom: 1px solid #eaeaea;
      background: white;
      width: 50%;
      float: left;
    }
    .tier-menu_nr .tier-menu li, .tier-menu_nr .tier-menu li:nth-of-type(2){
      transition-delay: 0.07s;
    }
    .tier-menu_nr .tier-menu li:nth-of-type(3), .tier-menu_nr .tier-menu li:nth-of-type(4){
      transition-delay: 0.14s;
    }
    .tier-menu_nr .tier-menu li:nth-of-type(5), .tier-menu_nr .tier-menu li:nth-of-type(6){
      transition-delay: 0.21s;
    }
    .tier-menu_nr .tier-menu li:nth-of-type(7), .tier-menu_nr .tier-menu li:nth-of-type(8){
      transition-delay: 0.28s;
    }
    .tier-menu_nr .tier-menu li:nth-of-type(9), .tier-menu_nr .tier-menu li:nth-of-type(10){
      transition-delay: 0.35s;
    }
    .tier-menu_nr .tier-menu li:nth-of-type(11), .tier-menu_nr .tier-menu li:nth-of-type(12){
      transition-delay: 0.42s;
    }
    .tier-menu_nr.cur .tier-menu li, .tier-menu_nr.cur .tier-menu li:nth-of-type(2){
      transition-delay: 0.77s;
    }
    .tier-menu_nr.cur .tier-menu li:nth-of-type(3), .tier-menu_nr.cur .tier-menu li:nth-of-type(4){
      transition-delay: 0.70s;
    }
    .tier-menu_nr.cur .tier-menu li:nth-of-type(5), .tier-menu_nr.cur .tier-menu li:nth-of-type(6){
      transition-delay: 0.63s;
    }
    .tier-menu_nr.cur .tier-menu li:nth-of-type(7), .tier-menu_nr.cur .tier-menu li:nth-of-type(8){
      transition-delay: 0.56s;
    }
    .tier-menu_nr.cur .tier-menu li:nth-of-type(9), .tier-menu_nr.cur .tier-menu li:nth-of-type(10){
      transition-delay: 0.49s;
    }
    .tier-menu_nr.cur .tier-menu li:nth-of-type(11), .tier-menu_nr.cur .tier-menu li:nth-of-type(12){
      transition-delay: 0.42s;
    }
    .tier-menu_nr.cur .tier-menu li{
      opacity: 1;
      transform: translate3d(0, 0, 0);
    }
    .tier-menu li a {
      line-height: 1.2rem;
      display: block;
      width: 100%;
      height: 100%;
      text-align: center;
/*      width: 50%;
      float: left;*/
    }
    .tier-menu li:nth-last-of-type(1) {
      border-bottom: 0px solid #eaeaea;
    }
    .tier-menu li {
      /*-webkit-animation-duration: 0.5s;
      animation-duration: 0.5s;
      -webkit-animation-fill-mode: both;
      animation-fill-mode: both;
      -webkit-animation-name: returnToNormal;
      animation-name: returnToNormal;*/
    }
.mob_nav_three{
  position: relative;
  z-index: 9999;

}
    .mob-mask {
      background-color: rgba(0, 0, 0, 0.6);
      background-color: rgba(0, 0, 0, 0.6);
      width: 100%;
      height: 100%;
      position: fixed;
      top: 0;
      display:none ;
    }
  }