@media (min-width: 1200px) {
  .header {
    position: relative;
  }

  .headerbox {
    padding: 0.5vw 11vw;
    display: flex;
    justify-content: space-between;
  }

  .logo {
    width: 21vw;
  }

  .logoImg {
    display: block;
    max-width: 100%;
    height: auto;
  }

  .nav {
    display: flex;
    align-items: center;
  }

  .nav li {
    float: left;
  }

  .first_li > a {
    display: block;
    color: black;
    font-size: 1vw;
    padding: 0 1vw;
    line-height: 3vw;
    font-family: "SOURCEHANSANSCN-BOLD";
  }

  .nav ul{
    margin-right: 1vw;
  }

  .nav .on a {
    height: 3vw;
    color: #fff;
  }

  .nav ul li:nth-child(3) ul {
    margin-left: 39vw;
  }

  .nav ul li:nth-child(4) ul {
    margin-left: 39vw;
  }

  .nav ul li:nth-child(5) ul {
    margin-left: 54vw;
  }

  .nav ul li:nth-child(6) ul {
    margin-left: 60vw;
  }

  .nav .active a {
    color: rgb(14, 123, 224);
  }

  .sub {
    display: none;
    width: 100%;
    position: absolute;
    left: 0;
    bottom: 0;
    transform: translate(0, 100%);
    z-index: 99;
    background-color: rgba(0, 0, 0, 0.5);
  }

  .sub li {
    line-height: 2vw;
    padding: 1vw 2vw;
  }

  .sub li a {
    font-size: 1vw;
    color: #fff;
  }

  .sub li a:hover {
    color: #2c6db2;
  }

  .subb {
    border-left: 0.2vw #4b976f solid;
    padding-left: 1vw;
  }

  .lxdh {
  }

  .lxdh img {
    width: 1.5vw;
    vertical-align: top;
  }

  .lxdh span {
    font-size: 1.1vw;
  }
}

@media (max-width: 1199px) {
  .header {
    background: white;
    height: 15vw;
    padding: 0 4vw;
    position: fixed;
    left: 0;
    top: 0;
    right: 0;
    z-index: 999;
  }

  .headerbox {
    width: 100%;
    height: 100%;
    overflow: hidden;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .logo {
    width: 60vw;
    /* padding-top: 1vw; */
  }

  .logo img {
    width: 60vw;
    display: block;
    max-width: 100%;
    height: auto;
  }

  .dhbtn {
    width: 6vw;
    height: 6vw;
    background: url(../images/d1.png) no-repeat center;
    background-size: 100% 100%;
  }

  .dhbtn.on {
    background: url(../images/d2.png) no-repeat center;
    background-size: 6vw 6vw;
  }

  .lxdh {
    display: none;
  }

  .nav {
    position: fixed;
    width: 100%;
    background: #fff;
    top: 15vw;
    left: 0;
    height: calc(100vh - 15vw);
    border-bottom: 0.3vw solid #eee;
    display: none;
    overflow: auto;
  }

  .nav ul {
    overflow: hidden;
  }

  .nav li {
    padding: 0 3%;
    line-height: 12vw;
    border-bottom: 0.3vw solid #eee;
    text-align: left;
  }

  .first_li a {
    font-size: 4.2vw;
    font-weight: 600;
    color: #999;
  }

  .nav .on a {
    display: block;
    color: #ffad33;
    border-bottom: 0.2vw solid #ffad33;
  }

  .sub {
    width: 100%;
    z-index: 100;
    background: #fff;
    display: none;
  }

  .sub li {
    width: 100%;
    line-height: 40px;
    border-bottom: 1px solid #eee;
    position: relative;
  }

  .sub a {
    font-size: 4.2vw;
    color: #999;
  }

  .sub a:hover {
    font-size: 4.2vw;
    color: #ffad33;
  }
}