body, html {
  margin: 0;
  padding: 0;
  font-size: 16px;
  color: #281e1b;
  min-width: 1400px;
}
img {
  display: block;
  object-fit: cover;
}

p, h1, h2, h3, h4, ul {
  margin: 0;
  padding: 0;
}

li, a {
  list-style: none;
  text-decoration: none;
  color: #281e1b;
}
input {
  outline: none;
}

.mt-20 {
  margin-top: 20px;
}

.mt-30 {
  margin-top: 30px;
}

.mt-40 {
  margin-top: 40px;
}

.mt-50 {
  margin-top: 50px;
}
.mt-60 {
  margin-top: 60px;
}
.mt-80 {
  margin-top: 80px;
}
.mt-100 {
  margin-top: 100px;
}
.mb-20 {
  margin-bottom: 20px;
}

.mb-30 {
  margin-bottom: 30px;
}

.mb-40 {
  margin-bottom: 40px;
}

.mb-50 {
  margin-bottom: 50px;
}

.pt-20 {
  padding-top: 20px;
}

.pt-30 {
  padding-top: 30px;
}

.pt-40 {
  padding-top: 40px;
}

.pb-40 {
  padding-bottom: 40px;
}

.fl {
  float: left;
}

.fr {
  float: right;
}

.w-1400 {
  width: 1392px;
  margin: 0 auto;
}

.cl:after, .clearfix:after {
  content: "\20";
  display: block;
  height: 0;
  clear: both;
  visibility: hidden
}

.cl, .clearfix {
  zoom: 1
}

.relative {
  position: relative;
}


/*头部*/
#nh_ul, #nh {
  display: none;
}
.header {
  height: 72px;
  padding-top: 15px;
}
.header img:first-child {
  float: left;
}
.header img:last-child {
  position: relative;
  top: 6px;
}
.header ul {
  width: 944px;
  margin: 0 0 0 60px;
  overflow: hidden;
  font-weight: bold;
  float: left;
}

.header ul li {
  float: left;
  margin-top: 10px;
}
.header ul li a {
  display: block;
  padding-left: 28px;
  padding-right: 28px;
  border-left: 2px solid rgba(40, 30, 27, 0.8);
  text-align: center;
  font-size: 18px;
}
.header ul li:last-child a {
  border-right: 2px solid rgba(40, 30, 27, 0.8);
}
.header ul li:hover {
  padding-bottom: 30px;
  border-bottom: 8px solid #257bb0;
}

/*搜索*/
.body {
  width: 100%;
  height: 100%;
  position: fixed;
  display: none;
  z-index: 50;
}
#search-input {
  display: none;
  position: absolute;
  right: 0;
  top: 70px;
  z-index: 100;
  border: 1px solid #c9c9c9;
  border-radius: 6px;
  width: 399px;
  height: 48px;
  background: #fff;
}
#search-input button {
  background: rgba(0,0,0,0);
  border-width: 0;
}
#search-input img {
  position: absolute;
  right: 15px;
  top: 50%;
  transform: translate(0, -50%);
  cursor: pointer;
}
#search-input input {
  margin-top: 5px;
  margin-left: 6px;
  height: 36px;
  width: 340px;
  font-size: 16px;
  text-indent: 10px;
  border: none;
}

/*底部*/
.footer{
  width: 100%;
  margin-top: 80px;
  background: url("../img/footer_bg.jpg") center bottom no-repeat;
  background-size: 100% 100%;
  height: 665px;
}

.link-box {
  height: 514px;
}
.link-box .home-link {
  position: absolute;
  top: 50%;
  left: 40px;
  text-align: center;
  font-weight: bold;
  font-size: 20px;
  line-height: 40px;
  transform: translate(0, -50%);
}
.link-group {
  width: 980px;
  height: 400px;
  padding-left: 60px;
  padding-right: 60px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate( -50%, -50%);
  border-left: 2px solid #ababab;
  border-right: 2px solid #ababab;
}
.link-group ul {
  width: 88px;
  font-size: 22px;
  font-weight: bold;
  text-align: center;
  float: left;
  margin-right: 89px;
}
.link-group ul:last-child {
  margin-right: 0;
}
.link-group ul li {
  font-size: 17px;
  font-weight: normal;
  margin-bottom: 18px;
}
.link-group ul li:first-child {
  margin-top: 30px;
}
.link-group ul li a {
  color: #656364;
}
.code {
  position: absolute;
  right: 0;
  top: 49%;
  transform: translate(0, -50%);
}
.copyright {
  height: 80px;
  line-height: 40px;
  text-align: center;
  font-size: 18px;
  color: white;
  padding: 35px 0;
}
.copyright img {
  display: inline;
  position: relative;
  top: 5px;
}
.copyright p:nth-child(2) img {
  top: 2px;
}
.copyright p:nth-child(2) img:nth-child(2) {
  top: 3px;
}

@media screen and (max-width: 640px){
  html {
    font-size: 100px;
  }
  body, html {
    max-width: 100%;
    min-width: unset;
  }
  .header {
    width: 3.9rem !important;
    margin: 0 !important;
    height: 0.4rem;
  }
  .header img:first-child {
    width: 2rem;
    margin-left: 0.2rem;
  }
  .header ul {
    display: none;
  }
  .header ul li a {
    border-left: none;
  }
  #nh {
    display: inherit;
  }
  #nh_ul {
    position: absolute;
    right: -0.2rem;
    top: 0.55rem;
    margin-left: 0;
    width: 1rem;
    z-index: 111;
    background: #2a7daf;
    border-radius: 0.1rem;
  }
  #nh_ul li {
    width: 1rem;
    float: unset;
    margin: 0.06rem 0;
    padding: 0;
    border: none;
  }
  #nh_ul li a{
    padding: 0;
    display: block;
    font-size: 0.14rem;
    text-align: center;
    line-height: 2;
    color: #eff0f0;
  }
  #search {
    overflow: hidden;
    float: right;
    height: 0.4rem;
    margin-top: -0.1rem;
  }
  #search img{
    overflow: hidden;
    display: block;
    width: 0.3rem;
  }
  #search-input {
    width: 3.5rem;
    height: 0.3rem;
  }
  #search-input input {
    height: 0.18rem;
  }
  #search-input img {
    width: 0.18rem;
  }
  #search-input input {
    margin-top: 0.05rem;
    margin-left: 0.06rem;
  }
  #nh {
    height: 0.26rem;
    margin-top: -0.1rem;
  }
  #nh img{
    width: 0.26rem;
  }
  .footer {
    background: url(../img/footer_bg_2.jpg) center bottom no-repeat;
    background-size: cover;
    height: 2.6rem;
  }
  .footer .link-group, .link-box .home-link {
    display: none;
  }
  .ipv6 {
    display: none;
  }
  .footer {
    margin-top: 0.4rem;
  }
  .footer .code {
    width: 1rem;
    float: unset !important;
    left: 50%;
    transform: translate(-50%, -50%);
  }
  .copyright {
    height: 0.6rem;
    line-height: 3;
    font-size: 0.1rem;
    padding: 0;
  }
  .copyright p:last-child {
    display: none;
  }
  .copyright img {
    width: 0.12rem;
  }
  .link-box {
    height: 1.8rem;
  }
  .w-1400 {
    width:3.9rem;
  }
  .box {
    background: none !important;
  }
}


  .header ul {
    overflow: visible !important;
  }
  .header ul li {
    position: relative;
  }
  .secNav {
    display: none;
    width: 132px !important;
    height: max-content;
    margin-left: 0!important;
    position: absolute;
    top: 30px;
    z-index: 100;
    background: #fff;
    border-radius: 5px;
    padding-bottom: 5px;
  }
  .secNav li {
    margin-top: 0 !important;
    width: 100%
  }
  .secNav li:first-child {
    border-top: 4px solid #257bb0;
  }
  .secNav li a {
    border-color: rgba(255, 255, 255, 0) !important;
    line-height: 2;
    padding-left: 15px !important;
    padding-right: 15px !important;
  }

  .secNav li:hover {
    border-bottom: none !important;
    background: #ddd;
    padding-bottom: 0 !important;
  }