/* 与官网 Vue 导航 header-nav-alert-box / nav-box 保持一致 */
.header-nav-alert-box {
  width: 100%;
  margin: 0 auto;
  height: 64px;
  display: flex;
  align-items: center;
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  background: #fff;
  border-bottom: 1px solid #999;
  z-index: 1000;
}

.nav-box {
  width: 1200px;
  max-width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: auto;
  padding: 0 16px;
  box-sizing: border-box;
}

.nav-box .logo-img-box {
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-box .logo-img-box img {
  height: 40px;
}

.nav-box .logo-img-box span {
  font-size: 16px;
  color: rgba(0, 0, 0, 0.9);
  font-weight: 600;
  margin-left: 10px;
}

.nav-box .nav ul {
  display: flex;
  align-items: center;
  flex-wrap: nowrap;
  list-style: none;
}

.nav-box .nav ul li {
  padding: 20px 0;
  box-sizing: border-box;
  flex-shrink: 0;
}

.nav-box .nav ul li a {
  padding: 0 20px;
  font-size: 15px;
  color: #08c;
  margin-bottom: 10px;
  position: relative;
  font-weight: 700;
  text-decoration: none;
  display: inline-block;
  white-space: nowrap;
}

.nav-box .nav ul li a em {
  font-style: normal;
}

.nav-box .nav ul li a span {
  position: absolute;
  top: 35px;
  bottom: 0;
  left: 0;
  width: 0;
  height: 4px;
  background: #3e6aff;
  transition: width 0.5s;
}

.nav-box .nav ul li:hover a span,
.nav-box .nav ul li a.active span {
  width: 100%;
}

.nav-box .nav ul li a:visited {
  color: #08c;
}

.nav-box .nav ul li a:hover em {
  color: #2f8ae7;
}