/* 切换导航栏变小 */
.main-nav {
  height: calc(100vh - 0px);
  overflow-y: hidden;
  width: 100%;
  display: none;
  background-color: #000;
  position: absolute;
  top: 70px;
}
@media (max-width: 561px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 40px;
  }
}
.main-nav a {
  text-decoration: none;
  color: #91d5ff;
}
.main-nav_title {
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  margin: 0 20px;
  font-size: 15px;
  font-weight: bold;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 70px;
}
.main-nav_title > div {
  font-size: 15px;
  font-weight: bold;
}
.main-nav_title > img {
  width: 24px;
  height: 24px;
}
.main-nav > ul > li > ul > a {
  margin: 7px 20px;
  font-size: 13px;
  padding: 13px 0;
  font-weight: 500;
  color: rgba(0, 0, 0, 0.75);
}
.nav-show {
  display: none;
}
.nav-tab {
  width: 24px;
  height: 32px;
  position: absolute;
  top: 22px;
  right: 24px;
  display: none;
  cursor: pointer;
}
@media (max-width: 820px) {
  .nav-tab {
    display: block;
  }
}
@media (max-width: 375px) {
  .nav-tab {
    position: absolute;
    top: 16px;
    right: 40px;
  }
}
.nav-tab .nav-tab-sub {
  display: flex;
  flex-direction: column;
}
.nav-tab .nav-tab-sub .nav-tab-sub-tips {
  width: 24px;
  height: 3px;
  margin-bottom: 5px;
  background: #91d5ff;
}
@media (max-width: 375px) {
  .nav-tab .nav-tab-sub .nav-tab-sub-tips {
    height: 2px;
  }
}
.nav_tab_x {
  display: none;
  width: 30px;
  height: 3px;
}
@media (max-width: 375px) {
  .nav_tab_x {
    height: 2px;
  }
}
.nav_tab_x:after,
.nav_tab_x:before {
  position: absolute;
  top: 8px;
  content: "";
  display: block;
  width: 30px;
  height: 3px;
  background: #91d5ff;
  z-index: 99;
}
@media (max-width: 375px) {
  .nav_tab_x:after,
  .nav_tab_x:before {
    height: 2px;
  }
}
.nav_tab_x:after {
  transform: rotate(45deg);
}
.nav_tab_x:before {
  transform: rotate(-45deg);
}