.top-nav {
  position: relative;
  z-index: 100;
  /* background: #f1f1f1; */
}

.top-nav .auto {
  max-width: 1280px;
  width: 100%;
  display: inline-flex;
}

.top-nav .top-menu .auto {
  max-width: 1320px;
}

.top-nav .top-menu #m3 .sub .sub-two {
  background: transparent;
}


@media(max-width:2000px) {

  .top-nav .top-left {
    width: 25%;
  }

  .top-nav .top-right {
    position: relative;
    z-index: 100;
  }
}

@media(max-width:1600px) {

  .top-nav .top-left {
    width: 100%;
  }

  .top-nav .top-right {
    position: relative;
    z-index: 100;
  }
}

@media(min-width: 1200px) {

  .top-nav .top-b {
    position: absolute;
    left: 0;
    top: 100%;
    width: 100%;
    z-index: 100;
  }

  .top-nav .top-b>.auto {
    display: table;
  }

  .top-nav .top-b>.auto>div {
    display: table-cell;
    vertical-align: middle;
  }

  .top-nav .top-left {
    width: 100%;
  }

  .top-nav .top-right {
    position: relative;
    z-index: 100;
  }

}

@media(min-width:1025px) {

  .top-nav .top-b {
    position: absolute;
    left: 0;
    top: 100%;
    width: 100%;
    z-index: 100;
  }

  .top-nav .top-b>.auto {
    display: table;
  }

  .top-nav .top-b>.auto>div {
    display: table-cell;
    vertical-align: middle;
  }

  .top-nav .top-left {
    width: 20%;
  }

  .top-nav .top-right {
    position: relative;
    z-index: 100;
  }

}

.top-nav .top-right dl {
  float: right;
}

.top-nav .top-right dl>* {
  float: left;
}

.top-nav .top-search {
  border-left: 1px solid rgba(255, 255, 255, 0.5);
  padding-left: 38px;
}

.top-nav_hover .top-search {
  border-left: 1px solid rgba(147, 147, 147, 0.5);
}

.top-nav .open-search {
  width: 18px;
  height: 18px;
  background: url("../images/top-nav-icon_search.png") no-repeat center center;
  display: block;
  cursor: pointer;
}

.top-nav_hover .open-search {
  background: url("../images/top-nav-icon_search_on.png") no-repeat center center;
}

.top-nav .open-search.on {
  background-image: url("../images/top-nav-icon_search.png");
}

.top-nav_hover .open-search.on {
  background-image: url("../images/top-nav-icon_search_on.png");
}

.top-nav .top-search .box {
  position: absolute;
  top: 90px;
  right: 0;
  background: #fff;
  padding: 0 20px;
  width: 300px;
  display: none;
  box-shadow: 0 5px 15px 0 rgba(0, 0, 0, 0.1);
}

.top-nav .top-search .box .text {
  width: 100%;
  height: 40px;
  line-height: 40px;
  background: none;
  border: 0;
}

.top-nav .top-search .box .btn {
  position: absolute;
  width: 40px;
  height: 100%;
  background: #d43418 url("../images/top-nav-icon_search.png") no-repeat center center;
  top: 0;
  right: 0;
}

.top-nav_hover .top-search .box .btn {
  background: #d43418 url("../images/top-nav-icon_search.png") no-repeat center center;
}

.top-nav .lang-list {
  position: absolute;
  left: 50%;
  width: 120px;
  margin-left: -60px;
  z-index: 100;
  background: #fff;
  border-radius: 0 0 5px 5px;
  top: 100%;
  padding: 10px 0;
  display: none;
}

.top-nav .lang-list a {
  display: block;
  line-height: 30px;
  text-align: center;
}



.top-nav .top-menu li b,

.top-nav .top-menu li b a {
  display: block;
}

.top-nav .sub,

.top-nav .sub-two {
  display: none;
}

.top-nav .sub .detail {
  line-height: 46px;
  display: inline-block;
  background: #d43418;
  padding: 0 30px;
  transition: 0.3s;
}

.top-nav .sub .detail:hover {
  background: #fff;
  color: #d43418;
}

.top-nav .sub-menu .name {
  font-size: 18px;
  display: block;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.top-nav .sub-imgtxt dl {
  display: none;
}



/* 鼠标经过头部改变样式 */

.top-nav_hover .top-b {
  background: #fff;
}

.top-nav .top_link,

.top-nav .logo2,

.top-nav_hover .logo1,

.top-nav .logo3 {
  display: none;
}

.top-nav_hover .logo2 {
  display: block;
}



@media(min-width:1025px) {

  .top-nav .sub-two {
    display: none !important;
  }

  .top-nav .top-menu ul {
    margin: 0 auto;
    float: right;
  }

  .top-nav .top-menu li {
    float: left;
    padding: 0 2vw;
  }

  .top-nav .top-menu li:last-of-type {
    padding-right: 0;
  }

  .top-nav .top-menu li b {
    font-weight: normal;
  }

  .top-nav .top-menu li b a {
    line-height: 90px;
    font-size: 17px;
    color: #fff;
  }

  .top-nav_hover .top-menu li b a {
    color: #333;
  }

  .top-nav .top-menu li:hover b a,

  .top-nav .top-menu li.aon b a {
    color: #d43418;
  }

  .top-nav .sub {
    position: absolute;
    left: 0;
    top: 100px;
    width: 100%;
    background: #fcfcfc;
    font-size: 16px;
  }

  .top-nav .sub::before {
    position: absolute;
    width: 30%;
    background: #f1f5f8;
    height: 100%;
    display: block;
    content: '';
  }

  .top-nav .top-menu li.aon .sub {
    z-index: 100;
  }

  .top-nav .sub,

  .top-nav .sub a {
    color: #333;
  }

  .top-nav .sub .auto {
    position: relative;
  }

  .top-nav .sub h4 {
    position: relative;
    padding: 0 0 25px 0;
    margin: 0 0 20px 0;
    font-size: 24px;
    font-weight: normal;
  }

  .top-nav .sub h4::after {
    position: absolute;
    width: 100%;
    height: 1px;
    background: #eee;
    display: block;
    content: '';
    bottom: 0;
  }



  .top-nav .sub-imgtxt dt {
    line-height: 50px;
  }

  .top-nav .sub-imgtxt pre {
    line-height: 1.5em;
    max-height: 4.5em;
    margin: 15px 0 40px 0;
  }

  .top-nav .sub[data-type="tab"] .auto {
    display: table;
  }

  .top-nav .sub[data-type="tab"] .auto>div {
    display: table-cell;
    vertical-align: top;
    padding: 50px 0;
  }

  .top-nav .sub .one-cate {
    width: 260px;
    background: #f1f5f8;
  }

  .top-nav .sub .two-cate {
    width: 25%;
    background: #e6eaee;
  }

  .top-nav .sub .two-cate dt.on {
    background-color: #fcfcfc;
  }

  .top-nav .sub .one-cate-info {
    padding: 3rem 0 0 3rem;

  }

  .top-nav .sub .one-cate-info .item {
    max-width: 490px;
    width: 100%;
    margin: 0 auto;
  }

  .top-nav .sub-menu .name {
    margin-bottom: 20px;
  }

  .top-nav .sub-menu .name a {
    color: #0061ff;
    float: left;
    max-width: 95%;
    padding-right: 26px;
    position: relative;
    display: block;
  }

  .top-nav .sub-menu .name a:after {
    position: absolute;
    width: 6px;
    height: 6px;
    content: '';
    transform: rotate(45deg);
    -webkit-transform: rotate(45deg);
    -ms-transform: rotate(45deg);
    border-bottom: 1px solid #0061ff;
    border-right: 1px solid #0061ff;
    right: 2px;
    top: 50%;
    margin-top: -3px;
  }



  .top-nav .sub .one-cate dt {}

  .top-nav .sub .one-cate dt.on {
    background: #e6eaee;
  }

  .top-nav .sub .one-cate dt.on a,

  .top-nav .sub .two-cate dt:hover a {
    font-weight: bold;
  }

  .top-nav .sub .one-cate dt.on,

  .top-nav .sub .two-cate dt:hover {
    background: url("../images/sanjiao.png") left top no-repeat #e6eaee;
  }

  .top-nav .sub .two-cate dt.on,

  .top-nav .sub .two-cate dt:hover {
    background: url("../images/sanjiao.png") left top no-repeat #fcfcfc;
  }

  .top-nav .sub .two-cate dt a,

  .top-nav .sub .one-cate dt a {
    display: block;
    line-height: 30px;
    padding: 10px 30px;
    background: url("../images/top_more.png") right 34px center no-repeat;
  }

  .top-nav .sub-imgtxt dt a {
    display: block;
    background: url("../images/top_more.png") right 34px center no-repeat;
  }

  .top-nav .sub-imgtxt dt a:hover {
    color: #e60012;
    background: url("../images/top_more2.png") right 34px center no-repeat;
  }

  .top-nav .sub .two-cate dt a {
    color: #333;
  }

  .top-nav .sub .two-cate dt a:hover {
    font-weight: bold;
  }



  .top-nav .sub-menu .item {
    float: left;
    max-width: 230px;
  }

  @media(min-width:992px) and (max-width:1280px) {

    .top-nav .sub-menu .item {
      max-width: 180px;
    }

    .top-nav .top-left {
      padding-left: 4%;
    }

    .top-nav .top-right {
      padding-right: 4%;
    }

  }

  .top-nav .sub-menu dd {
    line-height: 20px;
    padding: 4px 0;
  }

  .top-nav .sub-menu dd a {
    color: rgba(255, 255, 255, 0.8);
    font-size: 15px;
  }

  .top-nav .sub-menu dd a:hover {
    color: #00a2e9;
  }

}

@media(max-width:1366px) {

  .top-nav .top-menu ul {
    margin-right: 5em;
  }

}


@media(max-width:992px) {

  .top-nav .logo1,

  .top-nav_hover .logo2 {
    display: none;
  }

  .top-nav .logo3 {
    display: block;
  }

  .top-nav_hover .top-search {
    border-left: 0;
  }

  .top-nav>.auto {
    line-height: 40px;
  }

  .top-nav .top-b {
    background: #fff;
  }

  .top-nav .top-b>.auto {
    position: relative;
    z-index: 100;
  }

  .top-nav .top-right {
    float: right;
    padding-right: 0;
  }

  .top-nav .top-left {
    position: absolute;
    left: 0;
    top: 0;
    height: 68px;
    display: table;
    max-width: 40%;
  }

  .top-nav .top-left a {
    display: table-cell;
    vertical-align: middle;
  }

  .top-nav .top-left img {
    max-height: 46px;
    margin: 0 0 1rem 3rem;
  }

  .top-nav .top-menu {
    position: fixed;
    right: 0;
    top: 60px;
    /* bottom: 0; */
    width: 100%;
    z-index: 100;
    background: #f9f9f9;
    overflow: hidden;
    opacity: 0.86;
    transition: 0.68s;
  }

  .top-nav .open-search,

  .top-nav_hover .open-search {
    background: url("../images/top-nav-icon_search_on.png") no-repeat center center;
    margin-top: 25px;
  }

  .menu-show {
    overflow: hidden;
  }

  .menu-show .top-menu {
    opacity: 1;
    width: 100%;
  }

  .top-nav .top-menu ul {
    width: 100%;
    height: 100%;
    overflow: auto;
    padding-top: 30px;
  }

  .top-nav .top-menu li {
    position: relative;
  }

  .top-nav .top-menu li:first-of-type {
    display: none;
  }

  .top-nav .top-menu li::after {
    position: absolute;
  }

  .top-nav .top-menu li a {
    color: #333;
  }

  .top-nav .open-menu {
    height: 68px;
    width: 80px;
    background: #d43418;
    position: relative;
    margin-left: 20px;
  }

  .top-nav .open-menu.on {
    background: none;
  }

  .top-nav .open-menu i {
    position: absolute;
    height: 3px;
    background: #fff;
    width: 40%;
    left: 30%;
    top: 50%;
    margin-top: -1px;
    transition: 0.3s;
    border-radius: 2px;
  }

  .top-nav .open-menu:not(.on) i:nth-child(1) {
    margin-top: -9px;
  }

  .top-nav .open-menu:not(.on) i:nth-child(3) {
    margin-top: 7px;
  }

  .top-nav .open-menu.on i {
    background: #d43418;
  }

  .top-nav .open-menu.on i:nth-child(1) {
    transform: rotate(45deg);
  }

  .top-nav .open-menu.on i:nth-child(3) {
    transform: rotate(-45deg);
  }

  .top-nav .open-menu.on i:nth-child(2) {
    display: none;
  }

  .top-nav .top-menu li b {
    margin: 0 20px;
    line-height: 50px;
    border-bottom: 1px solid #f0f0f0;
    position: relative;
    overflow: hidden;
  }

  .top-nav .top-menu li b a {
    padding: 10px 0;
    font-size: 18px;
  }

  .top-nav .top-menu li b i.op {
    position: absolute;
    right: 10px;
    top: 5px;
    width: 100%;
    height: 60px;
    background: url(../images/top_more.png) no-repeat right center;
  }

  .top-nav .top-menu li b i.op.click {
    background: url(../images/top_more3.png) no-repeat right center;
  }

  .top-nav .top-search .box {
    width: 100%;
    top: 68px;
  }



  .top-nav .sub {
    padding: 10px 20px;
    position: absolute;
    left: 0;
    top: 100px;
    width: 100%;
    background: #fcfcfc;
    font-size: 16px;
  }

  .top-nav .sub .auto {
    width: 100%;
  }

  .top-nav .sub h4 {
    display: none;
  }

  .top-nav .sub[data-type="tab"] .one-cate-info,

  .top-nav .sub[data-type="tab"] .two-cate {
    display: none;
  }

  .top-nav .item-cate,

  .top-nav .sub-imgtxt {
    padding: 15px;
  }

  .top-nav .item-cate {
    background: #eee;
  }

  .top-nav .sub-imgtxt pre {
    color: #fff;
    margin: 10px 0;
  }

  .top-nav .sub-imgtxt {
    background: #f2f2f2;
    padding: 10px 20px;
  }

  .top-nav .sub-imgtxt dt {
    line-height: 35px;
  }

  .top-nav .sub .detail {
    line-height: 36px;
    padding: 0 15px;
  }

  .top-nav .sub-menu .name,

  .top-nav .sub .one-cate>dl>dt {
    border-bottom: 1px dotted rgba(255, 255, 255, 0.2);
  }

  .top-nav .sub-menu .name a,

  .top-nav .sub .one-cate>dl>dt>a {
    font-weight: normal;
    line-height: 50px;
    font-size: 16px;
    font-weight: bold;
    display: block;
  }

  .top-nav .sub .one-cate>dl>dt,

  .top-nav .sub-menu .name.has-dd,

  .top-nav .sub .one-cate>dl>dt>a {
    position: relative;
  }

  .top-nav .sub .one-cate>dl>dt>a {}

  .top-nav .sub-menu .name.has-dd:after,

  .top-nav .sub .one-cate>dl>dt>a:after {
    position: absolute;
    content: '';
    border: 6px solid transparent;
    border-top-color: #fff;
    right: 0;
    top: 50%;
    margin-top: -3px;
    transition: 0.3s;
  }

  .top-nav .sub-menu .name.click:after,

  .top-nav .sub .one-cate>dl>dt.click>a:after {
    transform: rotate(180deg);
    margin-top: -6px;
  }

  .top-nav .sub .one-cate>dl>dt .op-dt {
    position: absolute;
    width: 100%;
    height: 50px;
    z-index: 10;
    right: 0;
    top: 0;
    background: url(../images/top_more.png) no-repeat right center;
  }

  .top-nav .sub .one-cate>dl>dt.click .op-dt {
    background: url(../images/top_more3.png) no-repeat right center;
  }

  .top-nav .sub-menu dd,

  .top-nav .item-cate dt {
    line-height: 40px;
  }

  .top-nav .item-cate dt {
    font-size: 16px;
  }

  .top-nav .sub .one-cate>dl>dt.click>a,

  .top-nav .item-cate dt:hover a {
    color: #d43418;
  }

  .top-nav .sub-menu .name a:after {
    border-color: #fff;
  }

  .top-nav .sub-menu dl {
    background: rgba(0, 0, 0, 0.3);
    padding: 10px;
    display: none;
  }

  .top-nav .sub-menu .name.has-dd {
    position: relative;
    padding-right: 30px;
  }

  .top-nav .sub-menu .name .op-dd {
    z-index: 10;
    cursor: pointer;
    position: absolute;
    right: 0;
    top: 0;
    height: 100%;
    width: 30px;
  }

  .top-nav .sub-menu .item {
    margin-right: 0 !important;
  }

  .top-nav .links_box {
    width: 100%;
    position: relative;
    padding: 0 20px;
    margin-top: 2em;
  }

  .top-nav .top_link {
    padding: 20px;
    display: inline-block;
    width: 100%;
    text-align: center;
    background: #f1f1f1;
    background-size: 50px;
    font-size: 16px;
  }

  .top-nav .top_link img {
    padding-right: 10px;
    max-width: 35px;
  }

}