/*移动端头部*/
.m-header {
    display: none;
    width: 100%;
    height: 50px;
    align-items: center;
    justify-content: space-between;
    font-size: 0;
    position: fixed;
    left: 0;
    top: 0;
    background: #161919;
    z-index: 100;
  }
  
  .m-header a {
    display: block;
  }
  
  .m-logo {
    width:auto;
    height:45px;
    padding: 0 15px;
  }
  
  .m-menu-icon {
    padding: 0 15px;
    height: 20px;
  }
  
  .m-mask {
    display: none;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    position: fixed;
    left: 0;
    top: 0;
    z-index: 1000;
  }
  
  .m-nav {
    width: 80%;
    height: 100%;
    background: #fff;
    position: fixed;
    left: -100%;
    top: 0;
    z-index: 2000;
    transition: 0.5s;
  }
  
  .m-mask.on {
    display: block;
  }
  
  .m-nav.on {
    left: 0;
  }
  
  .m-nav-item {
    margin: 0 15px;
    height: 50px;
    line-height: 50px;
    display: block;
    text-align: center;
    border-bottom: 1px solid #eee;
    font-size: 15px;
    font-weight: bold;
  }
  
  .m-nav-item:hover,
  .m-nav-item.on {
    color: #d4a768;
  }

  @media screen and (max-width: 750px) {
    body {
        padding-top:50px;
      }
    .m-header {
        display: flex;
      }
  }