.main-nav {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  position: relative;
  position: absolute;
  z-index: 10;
  width: 100%;
  height: 92px;
  background: rgba(0,0,0,0.7);
}
@media screen and (max-width: 768px) {
  .main-nav {
    height: 64px;
  }
  .main-nav .logo-div {
    width: 100px !important;
    background-size: auto 40% !important;
    background-position: 24px center !important;
  }
  .main-nav .nav-div,
  .main-nav .language-div,
  .main-nav .extend-div {
    display: none !important;
  }
}
.main-nav.transparent {
  background: transparent;
}
.main-nav.mask {
  background: rgba(0,0,0,0.7) !important;
}
.main-nav:hover .extend-div {
  padding-top: 100px !important;
}
.main-nav a {
  text-decoration: none !important;
}
.main-nav .logo-div,
.main-nav .language-div {
  width: 320px;
  height: 100%;
}
.main-nav .logo-div {
  margin-left: 4em;
  background-repeat: no-repeat;
  background-size: contain;
  background-position: center center;
}
.main-nav .nav-div {
  flex-grow: 1;
  max-width: 1130px;
  height: 100%;
}
.main-nav .language-div {
  padding: 0px 46px;
}
.main-nav .language-div .search-icon {
  color: #fff;
  margin-right: 32px;
  cursor: pointer;
}
.main-nav .extend-div {
  display: block;
  position: absolute;
  left: 0px;
  top: -1080px;
  z-index: 90;
  width: 100%;
  height: 959px;
  height: 987px;
  padding: 100px 96px 0px;
  overflow: hidden;
  transition: opacity 0.8s;
  opacity: 0;
  background: rgba(0,0,0,0.5);
}
.main-nav .extend-div.extend {
  left: 0px;
  top: 92px;
  opacity: 1;
}
.main-nav .extend-div .nav-extend-div {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: flex-start;
  width: 100%;
  padding: 40px 124px;
  border-bottom: 1px solid rgba(200,200,200,0.5);
}
.main-nav .extend-div .nav-extend-div ul li {
  padding: 10px 0px;
  font-size: 20px;
  font-size: 16px;
  letter-spacing: 2px;
}
.main-nav .extend-div .nav-extend-div ul li:nth-child(1) {
  font-weight: bold;
  color: #a1f7f9;
}
.main-nav .extend-div .nav-extend-div ul li:nth-child(1) a {
  color: #a1f7f9;
}
.main-nav .extend-div .nav-extend-div ul li a {
  position: relative;
  color: #fff;
}
.main-nav .extend-div .nav-extend-div ul li a:hover {
  text-decoration: none;
}
.main-nav .extend-div .nav-extend-div ul li a::after {
  position: fixed;
  bottom: -5px;
  left: 50%;
  content: '';
  width: 0px;
  height: 2px;
  transition: all 0.25s;
  background: #a1f7f9;
}
.main-nav .extend-div .nav-extend-div ul li a:hover {
  text-decoration: none;
}
.main-nav .extend-div .nav-extend-div ul li a:hover::after {
  left: 0px;
  width: 100%;
}
.main-nav .extend-div .nav-extend-div .close-btn {
  width: 24px;
  cursor: pointer;
  transition: all 0.5s;
  transform-origin: center center;
}
.main-nav .extend-div .nav-extend-div .close-btn:hover {
  transform: rotate(180deg);
}
.main-nav .extend-div .nav-extend-div .close-btn .iconfont {
  font-size: 24px;
  color: #fefefe;
}
.main-nav .extend-div .search-div {
  border: 1px solid #7c7c7c;
  background: transparent;
}
.main-nav .extend-div .search-div .left-border-div {
  border-right: 1px solid #7c7c7c;
}
.main-nav .extend-div .search-div .search-input {
  background: transparent;
  color: #f2f2f2;
}
.main-nav .extend-div .search-div .iconfont {
  color: #7c7c7c;
}
.main-nav .extend-div .search-hide-div {
  display: none;
}
.main-nav .extend-div .nav-extend-search-div {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 100%;
  padding: 40px 0px;
}
.main-nav .extend-div .nav-extend-search-div .title-div {
  color: #fff;
  font-size: 42px;
  letter-spacing: 2px;
  margin-bottom: 52px;
}
.main-nav .extend-div .nav-extend-search-div .search-div {
  width: 60vw;
  border-radius: 0px;
  height: 52px;
  background: transparent;
}
.main-nav .extend-div .nav-extend-search-div .search-div .left-border-div {
  border-right: 1px solid #7c7c7c;
}
.main-nav .extend-div .nav-extend-search-div .search-div .search-input {
  flex-grow: 1;
  color: #f2f2f2;
  font-size: 16px;
  border: 1px solid #7c7c7c;
  background: transparent;
}
.main-nav .extend-div .nav-extend-search-div .search-div .search-button {
  flex-shrink: 0;
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  width: 52px;
  height: 52px;
  background-color: #fff;
}
.main-nav .extend-div .nav-extend-search-div .search-div .search-button .iconfont {
  margin: 0px;
  font-size: 16px;
  color: #7c7c7c;
}
.ul-nav {
  display: flex;
  flex-direction: row;
  justify-content: space-around;
  align-items: center;
  margin: 0px;
  height: 100%;
  list-style: none;
}
.ul-nav li {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100%;
}
.ul-nav li a {
  position: relative;
  padding: 0px 5px;
  font-size: 16px;
  line-height: 40px;
  color: #fff;
  letter-spacing: 2px;
  text-decoration: none;
}
.ul-nav li a::after {
  position: fixed;
  bottom: -5px;
  left: 50%;
  content: '';
  width: 0px;
  height: 2px;
  transition: all 0.25s;
  background: #a1f7f9;
}
.ul-nav li a:hover {
  text-decoration: none;
}
.ul-nav li a:hover::after {
  left: 0px;
  width: 100%;
}
.child-nav {
  display: flex;
  flex-direction: row;
  justify-content: flex-start;
  align-items: center;
  position: relative;
  border-bottom: 1px solid #d9d9d9;
}
@media screen and (max-width: 768px) {
  .child-nav {
    display: none;
  }
}
.child-nav a {
  display: inline-block;
  position: relative;
  padding: 0px clamp(6px, 1.14vw, 22px);
  margin-right: clamp(10px, 1.87vw, 36px);
  color: #8c8c8c;
  line-height: 86px;
  font-size: clamp(14px, 1.35vw, 26px);
  letter-spacing: 2px;
  font-family: 'pingfang_heavy';
  text-decoration: none;
}
.child-nav a.active {
  color: #ea6106;
}
.child-nav a.active:after {
  width: 100%;
  left: 0px;
}
.child-nav a:after {
  content: '';
  position: absolute;
  left: 50%;
  top: auto;
  bottom: -3px;
  width: 0px;
  height: 6px;
  transition: all 0.25s;
  background: #ea6106;
}
.child-nav a:hover:after {
  width: 100%;
  left: 0px;
}
.child-nav .search-div {
  float: right;
  margin: 27px 0px;
}
.main-nav-bs {
  position: fixed;
  z-index: 10;
  width: 100%;
  height: 92px;
  margin-bottom: 0px;
  border: 0px;
  border-radius: 0px;
  background: rgba(0,0,0,0.7);
}
@media screen and (max-width: 768px) {
  .main-nav-bs {
    height: 70px;
  }
}
.main-nav-bs .hide-in-big-scene-flex {
  display: none !important;
}
@media screen and (max-width: 768px) {
  .main-nav-bs .hide-in-big-scene-flex {
    display: flex !important;
  }
}
.main-nav-bs .hide-in-small-scene {
  display: block;
}
@media screen and (max-width: 768px) {
  .main-nav-bs .hide-in-small-scene {
    display: none !important;
  }
}
.main-nav-bs .hide-in-small-scene-flex {
  display: flex;
}
@media screen and (max-width: 768px) {
  .main-nav-bs .hide-in-small-scene-flex {
    display: none !important;
  }
}
.main-nav-bs .main-nav-container {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}
@media screen and (max-width: 768px) {
  .main-nav-bs .main-nav-container {
    display: block;
  }
}
.main-nav-bs .flex-nav {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
}
.main-nav-bs .dropdown-menu {
  background: rgba(0,0,0,0.7);
}
.main-nav-bs.transparent {
  background: transparent;
}
.main-nav-bs.transparent .dropdown-menu {
  background: rgba(0,0,0,0.7);
}
.main-nav-bs .logo-div,
.main-nav-bs .language-div {
  height: 92px;
  width: clamp(160px, 46.66vw, 320px);
}
@media screen and (max-width: 768px) {
  .main-nav-bs .logo-div,
  .main-nav-bs .language-div {
    height: 70px;
  }
}
.main-nav-bs .logo-div {
  background-repeat: no-repeat;
  background-size: contain;
  background-position: center center;
}
.main-nav-bs .collapse,
.main-nav-bs .navbar-collapse {
  flex-grow: 1;
}
@media screen and (max-width: 768px) {
  .main-nav-bs .navbar-collapse {
    height: calc(100vh - 92px);
    background-color: rgba(0,0,0,0.7);
  }
}
.main-nav-bs .navbar-collapse .language-div {
  display: none;
}
@media screen and (max-width: 768px) {
  .main-nav-bs .navbar-collapse .language-div {
    display: block;
  }
}
.main-nav-bs .navbar-nav {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  height: 92px;
}
@media screen and (max-width: 768px) {
  .main-nav-bs .navbar-nav {
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    width: auto !important;
    height: calc(100vh - 92px);
  }
}
.main-nav-bs .navbar-nav li {
  height: 100%;
}
@media screen and (max-width: 768px) {
  .main-nav-bs .navbar-nav li {
    padding: 0px 2em;
    width: 100%;
    height: auto;
  }
}
.main-nav-bs .navbar-nav li .dropdown-toggle {
  transition: all 0.5s;
}
.main-nav-bs .navbar-nav li.open .dropdown-toggle {
  background: rgba(0,0,0,0.9);
}
.main-nav-bs .navbar-nav li.dropdown {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 0px 0.25vw;
}
@media screen and (max-width: 768px) {
  .main-nav-bs .navbar-nav li.dropdown {
    padding: 0px 2em;
    align-items: flex-start;
  }
}
.main-nav-bs .navbar-nav li.dropdown a {
  background: transparent !important;
}
.main-nav-bs .navbar-nav .dropdown-menu li {
  height: 4em;
}
.main-nav-bs .navbar-nav .dropdown-menu li a {
  text-align: center;
}
.main-nav-bs .navbar-nav a {
  position: relative;
  padding: 0px 0.25vw;
  font-size: clamp(12px, 1vw, 20px);
  color: #ccc !important;
  letter-spacing: 0.1vw;
  font-family: 'pingfang_heavy';
  transition: all 0.5s;
  padding-bottom: 2px;
}
@media screen and (max-width: 768px) {
  .main-nav-bs .navbar-nav a {
    line-height: 3em;
  }
}
.main-nav-bs .navbar-nav a:hover {
  color: #a2f7fa !important;
  background: rgba(0,0,0,0.9) !important;
}
@media screen and (max-width: 768px) {
  .main-nav-bs .navbar-nav a:hover {
    background: transparent !important;
  }
}
.main-nav-bs .navbar-nav a:hover:after {
  content: ' ';
  left: 0px;
  width: 100%;
  opacity: 1;
}
.main-nav-bs .navbar-nav a:after {
  position: absolute;
  left: 50%;
  top: auto;
  bottom: -6px;
  width: 0px;
  content: '';
  transition: all 0.5s;
  opacity: 0;
  border: 1px solid #a2f7fa;
}
.main-nav-bs .language-div {
  width: auto;
  transition: width 0.5s;
}
.main-nav-bs .language-div .search-icon {
  color: #fff;
}
.main-nav-bs .search-input {
  width: 70px;
  transition: width 0.5s;
}
.main-nav-bs .search-input:focus {
  width: 140px;
}
.main-nav-bs .search-li {
  display: flex;
  flex-direction: row;
  justify-content: flex-start;
  align-items: center;
}
.main-nav-bs .search-li input {
  flex-grow: 1;
}