.page-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 7.2rem;
  background-color: transparent;
  z-index: 999;
  transition: background-color 0.3s ease, transform 0.3s ease;
}

/* 移动端适配：保持最小72px高度（7.2rem） */
@media(max-width:768px) {
  .page-header {
    min-height: 7.2rem !important;
    height: auto !important;
    /* 确保没有内边距或外边距影响高度 */
    margin: 0 !important;
    padding: 0 !important;
  }
  
  /* 确保header-inner也能支撑起header的高度 */
  .header-inner {
    min-height: 7.2rem !important;
    /* 确保内边距不会导致内容溢出 */
    padding: 0 2rem !important;
    box-sizing: border-box;
  }
}

.page-header.scrolled {
  background-color: rgba(28, 122, 171, 0.5);
}

.page-header.hidden {
  transform: translateY(-100%);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
  min-height: 7.2rem;
  max-width: 100%;
  margin: 0;
  padding: 0 8rem 0 2rem;
}

/* 移动端调整内边距 */
@media(max-width:768px) {
  .header-inner {
    padding: 0 ;
  }
}

.logo {
  display: flex;
  align-items: center;
  font-size: 2.4rem;
  font-weight: 600;
  color: #fff;
}

.logo img {
  width: 14.5rem;
  margin-right: 3rem;
}

.main-nav {
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list>li {
  position: relative;
}

.nav-list>li>a {
  color: #fff;
  font-size: 1.8rem;
  transition: .3s;
}

.nav-list>li:hover>a,
.nav-list>li.active>a {
  color: #fff;
}

.nav-list>li.active>a::after {
  content: '';
  position: absolute;
  bottom: -2.3rem;
  left: 0;
  width: 100%;
  height: 0.2rem;
  background-color: #fff;
}

.arrow {
  display: none;
}

.has-sub:hover .arrow {
  display: none;
}

/* 二级菜单样式 - 全屏mega menu，白色背景，24px字号，最大高度80vh */
.sub-nav {
  position: fixed;
  top: 7.2rem;
  left: 1vw;
  right: 0;
  width: 98vw;
  max-height: 85vh;
  height: 80vh;
  margin-top: 0;
  background: url('../img/sd/home_slices/menu.png') no-repeat center bottom;
  background-size: cover;
  display: none;
  padding: 3.6rem 0rem;
  list-style: none;
  z-index: 1000;
  box-sizing: border-box;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 0;
  align-items: flex-start;
  overflow-x: hidden;
  align-content: flex-start;
  border-radius: 1rem;
  justify-content: space-between;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-1rem);
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
}

.sub-nav.show {
  display: flex;
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  flex-wrap: nowrap;
  justify-content: center;  /* 恢复两端对齐 */
  overflow: hidden;
}

.sub-nav>li {
  flex: 0 0 auto;
  min-width: 20rem;
  width: max-content;
  /* 根据内容自适应宽度 */
  /* 移除最大宽度限制，让内容决定宽度 */
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  height: 100%;
  max-height: calc(80vh - 8rem);
}

.sub-nav>li>a {
  display: block;
  padding: 0 0 2rem 0;
  color: #333;
  font-size: 2.4rem;
  white-space: nowrap;
  font-weight: bold;
  border: none;
  line-height: 1.2;
}

.sub-nav>li>a:hover {
  background: transparent;
  color: #0052d9;
}

.sub-nav li {
  position: relative;
  list-style: none;
}

/* 三级菜单样式 - 20px字号，颜色#0052D9，在二级菜单中完全显示 */
.sub-nav .sub-nav-level-3 {
  flex: none;
  /* 不让 flex 伸缩 */
  align-self: flex-start;
  /* 防止被 flex 轴线拉伸 */
  position: static !important;
  display: none !important;
  /* 每行高度固定，超出一行就自动在新列继续 */
  grid-template-columns: repeat(3, 1fr);
  /* 使用固定列数和1fr实现真正的均分父级宽度 */
  gap: 0.8rem;
  /* 一列最大高度 */
  align-content: start;
  /* 从上往下、从左往右排 */

  margin: 0;
  padding: 0;
  background: transparent;
  box-shadow: none;
  min-width: auto;
  width: 100%;
  list-style: none;
  z-index: auto;
  opacity: 0;
  visibility: hidden;
  transform: translateX(-0.5rem);
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
}

/* 当父菜单显示时，子菜单也应该显示 */
.sub-nav.show .sub-nav-level-3,
.sub-nav .sub-nav-level-3.show {
  display: flex !important;
  opacity: 1;
  flex-direction: column;
  /* align-content: space-around; */
  /* 第二步：列分布 */
  flex-wrap: wrap;
  visibility: visible;
  transform: translateX(0);
  flex: none;  /* 修改为none，不自动占据空间 */
  height: 100%;  /* 修改为auto，根据内容决定高度 */
  width: 100%;
}

.sub-nav.show .sub-nav-level-3.show .sub-nav-level-4,
.sub-nav-level-3.show .sub-nav-level-4,
.sub-nav-level-3 .sub-nav-level-4.show {
  display: flex !important;
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  flex-direction: column;
}

/* 1. 让自身脱离 flex 控制 */
.sub-nav .sub-nav-level-3 {
  flex: none;
  /* 不被 flex 伸缩 */
  align-self: flex-start;
  /* 防止撑满整行 */
  display: grid !important;
  grid-template-columns: repeat(3, 1fr);
  /* 使用固定列数和1fr实现真正的均分父级盒子宽度 */
  gap: 2.8rem;
  max-height: 40rem;
  /* 一列最大高度 */
  align-content: start;
  /* 从上往下、从左往右排 */
  width: 100%;
  padding: 0;
  margin: 0;
  background: transparent;
  box-shadow: none;
  list-style: none;
  z-index: auto;
}

.sub-nav-level-3>li {
  margin-bottom: 2rem;
  position: relative;
  /* 确保网格项填充网格单元格，但不超出 */
  min-width: 0; /* 允许内容收缩以适应网格单元格 */
  max-width: 100%; /* 防止网格项超出网格单元格 */
  overflow: hidden; /* 防止内容溢出 */
}

.sub-nav-level-3>li>a {
  display: block;
  padding: 0.8rem 1.2rem;
  margin-left: -1.2rem;
  color: #0052D9;
  font-size: 2rem;
  /* 移除white-space: nowrap，允许文本换行以适应网格单元格 */
  font-weight: bold;
  border: none;
  line-height: 1.3;
  transition: background-color 0.2s;
  /* 确保文本不会溢出网格单元格 */
  overflow: hidden;
  text-overflow: ellipsis;
}

.sub-nav-level-3>li>a:hover {
  background: rgba(0, 82, 217, 0.1);
  color: #0052D9;
  border-radius: 0.4rem;
}

/* 四级菜单样式 - 16px字号，黑色字体，选中为#0052D9，在三级菜单中完全显示 */
.sub-nav .sub-nav-level-4 {
  position: static !important;
  display: none !important;
  margin: 1rem 0 0 0;
  padding: 0;
  background: transparent;
  box-shadow: none;
  min-width: auto;
  width: 100%;
  list-style: none;
  z-index: auto;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-0.5rem);
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
}

.sub-nav .sub-nav-level-4.show {
  display: block !important;
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.sub-nav-level-4 {
  position: static !important;
  display: none !important;
  margin: 1rem 0 0 0;
  padding: 0;
  background: transparent;
  box-shadow: none;
  min-width: auto;
  width: 100%;
  list-style: none;
  z-index: auto;
  flex: 1 1 auto;
  /* 占满剩余高度 */
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-0.5rem);
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
}

.sub-nav-level-4.show {
  display: block !important;
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.sub-nav-level-4>li {
  position: relative;
  flex: 1 1 0;
}

.sub-nav-level-4>li>a {
  display: block;
  padding: 0.6rem 1.2rem;
  margin-left: -1.2rem;
  color: #333;
  font-size: 1.6rem;
  white-space: nowrap;
  border: none;
  line-height: 1.5;
  transition: background-color 0.2s, color 0.2s;
}

.sub-nav-level-4>li>a:hover {
  color: #0052D9;
  background: rgba(0, 82, 217, 0.1);
  border-radius: 0.4rem;
}

.sub-nav-level-4>li.active>a,
.sub-nav-level-4>li>a.active {
  color: #0052D9;
  background: rgba(0, 82, 217, 0.1);
  border-radius: 0.4rem;
}

/* 二级菜单中的箭头样式 */
.sub-nav .arrow {
  display: none;
}

.sub-nav .has-sub:hover .arrow {
  display: none;
}

.m-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  width: 2.4rem;
  height: 2.4rem;
  cursor: pointer;
}

.m-toggle span {
  width: 100%;
  height: 0.2rem;
  background: #fff;
  transition: .3s;
  margin-bottom: 0.5rem;
}

.m-toggle span:last-child {
  margin-bottom: 0;
}

@media(max-width:768px) {
  /* 显示汉堡菜单图标 */
  .m-toggle {
    display: flex;
  }

  /* 隐藏PC端菜单 */
  .main-nav-pc {
    display: none;
  }

  /* 移动端菜单样式 */
  .main-nav-mobile {
    position: absolute;
    top: 7.2rem;
    left: 0;
    right: 0;
    background-color: rgba(28, 122, 171, 1);
    z-index: 998;
    overflow: hidden;
    max-height: 0;
    transition: max-height 0.3s ease;
  }

  /* 移动端菜单显示状态 */
  .main-nav-mobile.show {
    max-height: 100vh;
    max-height: 70vh !important;
    overflow-y: auto !important;
  }

  /* 移动端导航列表样式 */
  .main-nav-mobile .nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: 1.5rem;
    gap: 0;
  }

  /* 移动端菜单项样式 */
  .main-nav-mobile .nav-list>li {
    width: 100%;
    margin-bottom: 0.4rem;
  }

  /* 移动端菜单项链接样式 */
  .main-nav-mobile .nav-list>li>a {
    display: inline-block;
    /* width: 100%; */
    padding: 0.6rem 0;
    font-size: 1.6rem;
    color: #fff !important;
  }

  /* 移动端二级菜单样式 - 默认隐藏所有子菜单 */
  .main-nav-mobile .sub-nav {
    position: static !important;
    width: 100% !important;
    max-height: none !important;
    height: auto !important;
    background: transparent !important;
    display: none !important;
    flex-direction: column !important;
    padding: 0.4rem 0 0.4rem 2rem !important;
    margin-top: 0 !important;
    opacity: 1 !important;
    visibility: visible !important;
    transform: translateY(0) !important;
    transition: none !important;
    overflow: visible;
  }

  /* 移动端三级菜单样式 - 默认隐藏所有子菜单 */
  .main-nav-mobile .sub-nav-level-3 {
    position: static !important;
    max-height: none !important;
    display: none !important;
    flex-direction: column !important;
    padding: 0.4rem 0 0.4rem 2rem !important;
    opacity: 1 !important;
    visibility: visible !important;
    transform: translateY(0) !important;
    transition: none !important;
    overflow: visible;
  }

  /* 移动端四级菜单样式 - 默认隐藏所有子菜单 */
  .main-nav-mobile .sub-nav-level-4 {
    position: static !important;
    max-height: none !important;
    display: none !important;
    padding: 0.2rem 0 0.2rem 2rem !important;
    opacity: 1 !important;
    visibility: visible !important;
    transform: translateY(0) !important;
    transition: none !important;
    overflow: visible;
  }

  /* 只有产品中心菜单的子菜单在移动端显示 */
  .main-nav-mobile .nav-list > li.product-center-menu .sub-nav,
  .main-nav-mobile .nav-list > li.product-center-menu .sub-nav-level-3,
  .main-nav-mobile .nav-list > li.product-center-menu .sub-nav-level-4 {
    display: flex !important;
  }
  
  /* 确保四级菜单也显示 */
  .main-nav-mobile .nav-list > li.product-center-menu .sub-nav-level-4 {
    display: block !important;
  }

  /* 移动端子菜单链接样式 - 减小字号，白色字体，取消加粗和下内边距，修复左偏移 */
  .main-nav-mobile .sub-nav > li > a,
  .main-nav-mobile .sub-nav-level-3 > li > a,
  .main-nav-mobile .sub-nav-level-4 > li > a {
    font-size: 1.6rem !important;
    color: #fff !important;
    padding: 0.4rem 0 0 !important;
    font-weight: normal !important;
    margin-left: 0 !important;
    white-space: normal !important;
    overflow: visible !important;
    text-overflow: clip !important;
  }

  /* 取消移动端二级菜单项的高度限制，避免菜单重叠 */
  .main-nav-mobile .sub-nav > li {
    height: auto !important;
    max-height: none !important;
  }

  /* 取消移动端三级和四级菜单项的高度限制，避免菜单重叠 */
  .main-nav-mobile .sub-nav-level-3 > li,
  .main-nav-mobile .sub-nav-level-4 > li {
    height: auto !important;
    max-height: none !important;
  }

  /* 移动端菜单激活状态样式 - 蓝色文本，取消下划线 */
  .main-nav-mobile .nav-list > li.active > a {
    font-weight: bold !important;
  }

  /* 取消移动端一级菜单激活状态的下划线 */
  .main-nav-mobile .nav-list > li.active > a::after {
    content: none !important;
  }

  /* 移动端二级、三级、四级菜单激活状态样式 - 蓝色文本 */
  .main-nav-mobile .sub-nav > li.active > a,
  .main-nav-mobile .sub-nav-level-3 > li.active > a,
  .main-nav-mobile .sub-nav-level-4 > li.active > a,
  .main-nav-mobile .sub-nav > li > a.active,
  .main-nav-mobile .sub-nav-level-3 > li > a.active,
  .main-nav-mobile .sub-nav-level-4 > li > a.active {
        font-weight: bold !important;
  }
}

/* PC端保持原有样式 */
@media(min-width:769px) {
  .main-nav-pc {
    display: block;
  }
  .main-nav-mobile {
    display: none;
  }
  .m-toggle {
    display: none;
  }
}


/* 清理重复规则，统一三级菜单样式 */
.sub-nav>li {
  max-width: none !important;
  width: max-content !important;
  /* 根据内容自适应宽度 */
  min-width: 20rem;
}

.sub-nav>li:nth-child(2) {
  width: max-content;
}

.sub-nav>li:nth-child(3) {
  width: max-content;
}
.sub-nav>li:nth-child(2)>a{
}

.sub-nav>li.has-sub {
  width: max-content;
  /* 根据内容自适应宽度 */

}

/* 三级菜单样式统一 */
.sub-nav .sub-nav-level-3 {
  display: grid !important;
  /* 使用fr单位实现均分父级宽度 */
  grid-template-columns: repeat(auto-fit, minmax(20rem, 1fr));
  gap: 0.8rem;
  max-height: calc(80vh - 3.2rem);
  align-content: start;
  width: 100%;
}

/* 三级菜单项样式 */
.sub-nav-level-3>li.has-sub {
  /* 确保网格项填充网格单元格，但不超出 */
  min-width: 25rem; /* 允许内容收缩以适应网格单元格 */
  max-width: 100%; /* 防止网格项超出网格单元格 */
  min-height: 0;
  max-height: none;
  display: flex;
  flex-direction: column;
  align-items: stretch; 
  overflow: hidden; /* 防止内容溢出 */
}


.sub-nav>.has-sub>a {
  display: block;
  text-align: left;
}