.footer {
  background-color: #333;
}
.footer .nav-main, .footer .nav-content {
  display: flex;
  justify-content: space-between;
  padding: 0 16.666667vw;
}
.nav-main {
  border-bottom: 1px solid #777;
 }
.nav-main-list, .nav-content-list {
  flex-grow: 1;
  display: flex;
  justify-content: space-between;
}
.nav-main-list {
  margin-right: 1.458vw;
}
.nav-main-item {
  flex-basis: 16.666667%;
  transition: all .3s;
}
.nav-main-link {
  display: block;
  padding: 1.5em 0;
  font-size: 0.833333vw;
  color: #ccc;
  line-height: 1;
  cursor: pointer;
}
.nav-main-link:hover {
  color: #fff;
}
.nav-main-item:last-child, .nav-content-item:last-child {
  min-width: 14.583333vw;
}
.nav-main-item:nth-child(1), .nav-content-item:nth-child(1) {
  min-width: 9.375vw;
}
.wb-youtube {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  min-width: 6.510417vw;
  font-size: 0;
}
.nav-social-wrapper {
  position: relative;
  height: 1.302vw;
}
.nav-social-wrapper:first-child {
  width: 4.479vw;
}
.nav-social-wrapper:nth-child(2) {
  width: 3.49vw;
}
.nav-social-wrapper:last-child {
  width: 3.385417vw;
}
.nav-social-wrapper:not(:last-child) {
  margin-right: 1.041667vw;
}
.nav-main-img, .nav-main-img-hover {
  width: 100%;
  height: 100%;
}
.contact-hover {
  display: none;
  position: absolute;
  top: -8.854vw;
  left: 50%;
  transform: translateX(-50%);
  width: 7.292vw;
  height: 7.76vw;
}
.nav-social-wrapper:first-child:hover .contact-hover,
.nav-social-wrapper:nth-child(2):hover .contact-hover,
.nav-social-wrapper:last-child:hover .contact-hover {
  display: block;
}
.nav-main-img-hover {
  display: none;
}
.nav-social-wrapper:hover .nav-main-img {
  display: none;
}
.nav-social-wrapper:hover .nav-main-img-hover {
  display: block;
}
.footer .nav-content {
  padding-top: 1.25vw;
  padding-bottom: 1.25vw;
}
.nav-content-list {
  margin-right: 10.417vw
}
.nav-content-item {
  flex-basis: 16.666667%;
  display: flex;
  flex-direction: column;
}
.nav-content-item > span {
  line-height: 2em;
}
.nav-content-link {
  font-size: 0.729167vw;
  color: #999;
  cursor: pointer;
  line-height: 2em;
  transition: all .3s;
}
.nav-content-link:hover {
  color: #fff;
}
.nav-footer-contact {
  font-size: 0.729167vw;
  color: #ccc;
}
.nav-footer-contact:first-child {
  font-weight: bold;
  color: #fff;
}
.wechat {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  margin-top: 1.354167vw;
}
.wechat .nav-content-img {
  width: 4.479167vw;
  height: 4.479167vw;
}
.wechat .wechat-name {
  width: 4.479167vw;
  font-size: 0.729167vw;
  color: #999;
  text-align: center;
  line-height: 2em;
}
.copyright {
  height: 4.166667vw;
  border-top: 1px solid #555;
  font-size: 0.729167vw;
  color: #999;
}
.copyright > a {
  color: inherit;
}
.copyright > a:last-child {
  display: flex;
  align-items: center;
  margin-left: 1em;
}
.copyright img {
  width: 1.042vw;
  height: 1.042vw;
}