.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 999;
  transition: all 0.8s;
}
.header.scroll {
  background-color: rgba(64, 64, 64, 0.6);
}
.header.scroll .header-nav-box .header-nav .secend-ul,
.header.scroll .header-nav-box .header-nav .third-ul {
  background-color: rgba(0, 0, 0, 0.4);
}
.pc-header {
  width: 100%;
  padding: 30px 0 10px;
  margin: 0 auto 0;
}

.header-nav-box {
}
.header-nav-box .logo-box {
  line-height: 45px;
}
.header-nav-box .logo-box img {
  height: 45px;
  vertical-align: middle;
}
.header-nav-box .logo-box span {
  line-height: 45px;
  vertical-align: text-top;
  color: white;
  font-size: var(--text-xs);
}
.header-nav-box .header-nav {
  text-align: right;
}
.header-nav-box .header-nav li {
  position: relative;
  display: inline-block;
  line-height: 45px;
  padding: 0 10px;
  font-size: var(--text-sm);
}
.header-nav-box .header-nav li:last-child {
  padding-right: 0;
}
.header-nav-box .header-nav li a {
  color: white;
}
.header-nav-box .header-nav li a:hover {
  color: var(--color-theme);
}
.header-nav-box .header-nav li:hover .secend-ul {
  display: block;
}
.header-nav-box .header-nav .secend-ul {
  display: none;
  position: absolute;
  top: 45px;
  left: 0;
  background: rgba(250, 250, 250, 0.2);
}
.header-nav-box .header-nav .secend-ul li {
  text-align: left;
  display: block;
  min-width: 150px;
  line-height: 30px;
}
.header-nav-box .header-nav .secend-ul a {
  display: block;
  white-space: nowrap;
}
.header-nav-box .header-nav .secend-ul li:hover .third-ul {
  display: block;
}
.header-nav-box .header-nav .third-ul {
  display: none;
  position: absolute;
  top: 0;
  right: -100%;
  background: rgba(250, 250, 250, 0.2);
}
.header-nav-box .header-nav .third-ul li {
  text-align: left;
  display: block;
  min-width: 150px;
  line-height: 30px;
}

.scroll-to-top {
  position: fixed;
  right: 5vw;
  bottom: 5vh;
  display: none;
  z-index: 999;
}
.scroll-to-top .icon {
  font-size: 50px;
  color: var(--color-theme);
  cursor: pointer;
}

/* 移动端菜单栏 */
.mb-header .header-nav-box {
  padding: 10px;
}
.mb-header .mb-header-top .logo-box {
  width: 100%;
  max-width: 220px;
}
.mb-header .mb-header-top .logo-box img {
  height: auto;
  width: 100%;
}
.mb-header-top .menu-icon {
  text-align: right;
}
.mb-header-top .menu-icon .icon {
  color: white;
  font-size: 40px;
  cursor: pointer;
}
/* 移动端菜单栏遮罩交互 */
.popver-content {
  position: fixed;
  visibility: hidden;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 9999;
}

.popver-content .popver-nav {
  position: absolute;
  width: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  left: -100%;
  top: 0;
  bottom: 0;
  overflow-y: auto;
  transition: all 0.6s;
  z-index: 9999;
}

.popver-content .popver-task {
  position: absolute;
  width: 100%;
  background-color: rgba(0, 0, 0, 0.6);
  opacity: 0;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  z-index: 1001;
  transition: all 0.6s;
}

.popver-content.active {
  visibility: visible;
}

.popver-content.active .popver-nav {
  left: 0;
}

.popver-content.active .popver-task {
  opacity: 1;
}

.popver-content .close-icon .icon {
  line-height: 60px;
  padding: 0 20px;
  font-size: 26px;
  color: white;
  cursor: pointer;
}
/* 遮罩层内联nav 利用main-menu可以渲染多个位置的选项并手动控制显隐 */
.popver-content .main-menu {
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.popver-content .main-menu a {
  color: white;
}

.popver-content .main-menu-li {
  position: relative;
  font-size: 18px;
  line-height: 60px;
  padding-left: 15px;
  font-weight: normal;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}
.popver-content .main-menu-li .main-icon {
  position: absolute;
  font-size: 18px;
  line-height: 60px;
  right: 15px;
  top: 0;
  color: white;
  padding: 0 10px;
  cursor: pointer;
  transition: all 0.3s;
}

.popver-content .main-menu-li.active .menu-item {
  display: block;
  transition: all 0.3s;
}
.popver-content .main-menu-li.active .main-icon {
  transform: rotate(90deg);
}

.popver-content .main-menu-li .menu-item {
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  display: none;
}

.popver-content .main-menu-li .menu-item li {
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  padding-left: 15px;
}

.popver-content .main-menu-li .menu-item li:last-child {
  border: none;
}