/* 正文字体见 fonts-local.css（Inter 等），此处不再 @import 外网字体 */

/* ========== 站点品牌：标题 + 图标（多页顶栏共用） ========== */
.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  max-width: min(32rem, 78vw);
}

/* 徽标：学术深蓝主色 + 浅色图标，与站点 secondary / 顶栏藏蓝一致 */
.site-brand__mark {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: 0;
  font-size: 1.15rem;
  color: #e8eef8;
  background: linear-gradient(145deg, #163268 0%, #0a032e 55%, #060226 100%);
  box-shadow:
    0 4px 16px rgba(10, 36, 99, 0.42),
    inset 0 1px 0 rgba(255, 255, 255, 0.14);
}

/* 品牌标题：马善政（手写风艺术字） */
.site-brand__text {
  font-family: "Ma Shan Zheng", "STKaiti", "KaiTi", "FangSong", "SimSun", serif;
  font-weight: 700;
  letter-spacing: 0.05em;
  line-height: 1.32;
  font-size: clamp(1.22rem, 2.35vw, 1.72rem);
}

/* 旧版单栏顶栏（非 academic）：白字压在首屏图上 */
.site-header:not(.site-header--academic) .site-brand__text {
  color: #ffffff;
  text-shadow:
    0 2px 20px rgba(0, 0, 0, 0.45),
    0 1px 3px rgba(0, 0, 0, 0.55);
}

/* 新闻列表横幅顶栏：与配图协调，白字 */
.news-header.news-header--banner .site-brand__text {
  color: #ffffff;
  text-shadow:
    0 2px 18px rgba(0, 0, 0, 0.5),
    0 1px 2px rgba(0, 0, 0, 0.45);
}

/* 新闻详情页顶栏：深蓝渐变字，衬在浅色正文区上 */
.news-header.news-header--detail .site-brand__text {
  color: #0a032e;
  text-shadow: none;
}

@supports (-webkit-background-clip: text) or (background-clip: text) {
  .news-header.news-header--detail .site-brand__text,
  .news-header.news-header--detail.scrolled .site-brand__text {
    background: linear-gradient(120deg, #0a032e 0%, #163268 48%, #85b1e0 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 9999;
  /* 初始渐变背景由JS动态设置，这里清空 */
  background: transparent !important;
  background-color: transparent !important;
  background-image: none !important;
  /*background: transparent;*/
  /* 移除毛玻璃相关属性 */
  /* backdrop-filter: blur(12px);*/
  /* -webkit-backdrop-filter: blur(12px);*/
  /* 初始轻微阴影，保持层次感 */
  /*box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);*/
  /*-webkit-box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);*/
  /* 保留过渡动画，新增background-image过渡（渐变属于background-image） */
  transition: background 0.3s ease, background-image 0.3s ease, box-shadow 0.3s ease, transform 0.5s ease;
  -webkit-transition: background 0.3s ease, background-image 0.3s ease, -webkit-transform 0.5s ease, -webkit-box-shadow 0.3s ease;
  box-sizing: border-box;
  padding: 0 20px;
  /* 确保渐变覆盖整个header高度 */
  height: auto; /* 可根据实际需求设置固定高度，比如60px */
  min-height: 60px;
}

.site-header.over {
  /* over类：纯背景色，无渐变 */
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  -webkit-box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  /* 渐变清空，改为纯纯色 */
  background-image: none;
  background-color: #163268 !important; /* 深邃藏蓝，适配学术网页 */
}

/* 新闻页顶栏主导航：白字（仅 .news-header，勿作用于 .site-header--academic .site-nav-primary） */
.news-header nav.hidden.md\:flex {
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.news-header:not(.over) nav.hidden.md\:flex {
  color: #ffffff;
}

.news-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 9999;

   /*移除毛玻璃相关属性 */
   backdrop-filter: blur(12px);
   -webkit-backdrop-filter: blur(12px);
   /*初始轻微阴影，保持层次感 */
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
  -webkit-box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);

  box-sizing: border-box;
  padding: 0 20px;
  /* 确保渐变覆盖整个header高度 */
  height: auto; /* 可根据实际需求设置固定高度，比如60px */
  min-height: 60px;
}

.news-header.over {
  /* over类：纯背景色，无渐变 */
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  -webkit-box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  /* 渐变清空，改为纯纯色 */
  background-image: none;
  background-color: #163268 !important; /* 深邃藏蓝，适配学术网页 */
}

/* ========== 新闻列表页：顶栏使用横幅图 ========== */
.news-header.news-header--banner {
  background: url("../images/site/banners/banner3.jpg") no-repeat center center !important;
  background-size: cover !important;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.news-header.news-header--banner.scrolled {
  background: linear-gradient(
          to bottom,
          rgba(10, 36, 99, 0.9),
          rgba(10, 36, 99, 0.9)
      ),
      url("../images/site/banners/banner3.jpg") no-repeat center center !important;
  background-size: cover !important;
}

/* ========== 新闻详情页：顶栏纯色（备用） ========== */
.news-header.news-header--solid {
  background-color: #163268 !important;
  background: #163268 !important;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

/* ========== 新闻详情页：顶栏透明，避免压住浅色标题区；滚动后略加毛玻璃 ========== */
.news-header.news-header--detail {
  background: transparent !important;
  background-color: transparent !important;
  background-image: none !important;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  box-shadow: none;
  -webkit-box-shadow: none;
  border-bottom: 1px solid rgba(10, 3, 46, 0.07);
  transition: background 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease,
    backdrop-filter 0.25s ease;
}

.news-header.news-header--detail.scrolled {
  background: rgba(255, 255, 255, 0.94) !important;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.05);
  -webkit-box-shadow: 0 1px 0 rgba(0, 0, 0, 0.05);
  border-bottom-color: rgba(10, 3, 46, 0.1);
}

.news-header.news-header--detail nav.hidden.md\:flex,
.news-header.news-header--detail:not(.over) nav.hidden.md\:flex {
  color: #0a032e;
  text-shadow: none;
}

.news-header.news-header--detail .nav-link {
  color: #334155;
}

.news-header.news-header--detail .nav-link:hover,
.news-header.news-header--detail .nav-link.active {
  color: #163268;
}

/* ========== 学术顶栏：参考 team.sdu.edu.cn/enercat — 快捷链接 + 品牌行 + 全宽导航条 ========== */
.site-header.site-header--academic {
  --academic-nav-scroll: 0;
  --academic-nav-bg: #94070a;
  --academic-nav-bg-scrolled: #94070a;
  --academic-nav-hover: #ffffff;
  --sticky-nav-accent: #94070a;
  background: transparent !important;
  background-color: transparent !important;
  background-image: none !important;
  padding: 0;
  min-height: 0;
  box-shadow: none;
  border-bottom: none;
  transition: all 0.3s ease-in-out;
}

.site-header--academic .site-header__academic-shell {
  position: relative;
  z-index: 1;
  overflow: visible;
  background-color: var(--academic-nav-bg, #94070a);
  border-bottom: 1px solid rgba(0, 0, 0, 0.22);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
  transition: background-color 0.3s ease-in-out, box-shadow 0.3s ease-in-out, border-color 0.3s ease-in-out;
}

.site-header--academic.is-scrolled .site-header__academic-shell {
  background-color: var(--academic-nav-bg, #94070a);
  border-bottom: 1px solid rgba(0, 0, 0, 0.22);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.22);
}

.site-header--academic .site-header__academic-inner {
  position: relative;
  z-index: 2;
  box-sizing: border-box;
  overflow: visible;
  transition: padding 0.3s ease-in-out, gap 0.2s ease;
}

/* 顶栏版心：与正文 .site-layout-wide 同宽同 gutter（参考 jiemin.whu.edu.cn） */
.site-header--academic .site-header__content-wrap {
  box-sizing: border-box;
  width: 100%;
  max-width: min(var(--site-layout-max, 75rem), var(--site-layout-vw, 100%));
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--site-layout-gutter);
  padding-right: var(--site-layout-gutter);
}

/* 品牌行高度：参考 jiemin.whu.edu.cn — 加高 logo 区与上下留白 */
.site-header--academic .site-header__academic-inner.site-header__content-wrap {
  padding-top: 1.25rem;
  padding-bottom: 1rem;
}

@media (max-width: 767.98px) {
  .site-header--academic .site-header__academic-inner.site-header__content-wrap {
    padding-top: 1rem;
    padding-bottom: 0.85rem;
  }
}

/* 滚动时仅第一行（品牌区）紧凑缩放；第二行主导航尺寸不变 */
.site-header--academic .site-header__brand-logo-wrap,
.site-header--academic .site-header__labtitle,
.site-header--academic .site-header__labtitle-en,
.site-header--academic .site-header__brand-sep {
  transition:
    height 0.3s ease-in-out,
    width 0.3s ease-in-out,
    font-size 0.3s ease-in-out;
}

.site-header--academic.is-scrolled .site-header__academic-inner.site-header__content-wrap {
  padding-top: 0.85rem;
  padding-bottom: 0.75rem;
}

.site-header--academic.is-scrolled .site-header__brand-logo-wrap {
  height: clamp(3.25rem, 5.5vw, 4.35rem);
}

.site-header--academic.is-scrolled .site-header__brand-sep {
  font-size: clamp(1rem, 0.9vw + 0.75rem, 1.2rem);
}

@media (max-width: 767.98px) {
  .site-header--academic.is-scrolled .site-header__academic-inner.site-header__content-wrap {
    padding-top: 0.65rem;
    padding-bottom: 0.6rem;
  }

  .site-header--academic.is-scrolled .site-header__labtitle {
    font-size: clamp(1.22rem, 4.6vw, 1.58rem);
  }

  .site-header--academic.is-scrolled .site-header__labtitle-en {
    font-size: clamp(0.68rem, 1.3vw + 0.42rem, 0.78rem);
  }
}

@media (min-width: 768px) {
  .site-header--academic.is-scrolled .site-header__labtitle {
    font-size: clamp(1.32rem, 1.05rem + 0.72vw, 1.72rem);
  }

  .site-header--academic.is-scrolled .site-header__labtitle-en {
    font-size: clamp(0.74rem, 0.38vw + 0.58rem, 0.875rem);
  }
}

@media (min-width: 768px) {
  .site-header--academic .site-header__identity-row {
    width: 100%;
    min-width: 0;
    margin: 0;
    padding: 0;
    border-bottom: none;
  }
}

.site-header--academic .site-header__identity-actions {
  min-width: 0;
}

/* 桌面搜索：放大镜锚定右侧，输入区向左展开 */
.site-header--academic .site-header__search--inline.site-header__search--reveal {
  --site-header-search-size: 2.5rem;
  --site-header-search-expanded-width: min(13.5rem, 26vw);
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: flex-end;
  box-sizing: border-box;
  flex-shrink: 0;
  width: var(--site-header-search-size);
  min-width: var(--site-header-search-size);
  max-width: var(--site-header-search-size);
  height: var(--site-header-search-size);
  margin: 0;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.14);
  overflow: hidden;
  transition:
    width 0.35s cubic-bezier(0.4, 0, 0.2, 1),
    min-width 0.35s cubic-bezier(0.4, 0, 0.2, 1),
    max-width 0.35s cubic-bezier(0.4, 0, 0.2, 1),
    border-radius 0.25s ease,
    background-color 0.25s ease,
    border-color 0.25s ease,
    box-shadow 0.25s ease;
}

/* 未展开：仅显示放大镜，去掉圆形底与描边（尺寸不变，避免图标位移） */
.site-header--academic:not(.is-scrolled) .site-header__search--inline.site-header__search--reveal:not(.site-header__search--force-open):not(.site-header__search--expanded) {
  border: none;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  overflow: hidden;
}

.site-header--academic.is-scrolled .site-header__search--inline.site-header__search--reveal,
.site-header--academic .site-header__search--inline.site-header__search--reveal.site-header__search--expanded,
.site-header--academic .site-header__search--inline.site-header__search--force-open {
  width: var(--site-header-search-expanded-width);
  min-width: var(--site-header-search-expanded-width);
  max-width: var(--site-header-search-expanded-width);
  border-radius: 9999px;
  background: transparent;
  border-color: rgba(255, 255, 255, 0.42);
  box-shadow: none;
}

.site-header--academic .site-header__search--inline.site-header__search--reveal .site-header__search-input {
  position: absolute;
  top: 0;
  left: 0;
  right: var(--site-header-search-size);
  width: auto;
  height: var(--site-header-search-size);
  margin: 0;
  padding: 0 0.2rem 0 0.85rem;
  border: none;
  border-radius: 0;
  box-shadow: none;
  opacity: 0;
  pointer-events: none;
  overflow: hidden;
  appearance: none;
  -webkit-appearance: none;
  font-size: 0.875rem;
  line-height: 1.35;
  color: #fff;
  background: transparent;
  transition: opacity 0.22s ease 0.06s;
}

.site-header--academic.is-scrolled .site-header__search--inline.site-header__search--reveal .site-header__search-input,
.site-header--academic .site-header__search--inline.site-header__search--reveal.site-header__search--expanded .site-header__search-input,
.site-header--academic .site-header__search--inline.site-header__search--force-open .site-header__search-input {
  opacity: 1;
  pointer-events: auto;
}

.site-header--academic .site-header__search--inline.site-header__search--reveal .site-header__search-input::placeholder {
  color: rgba(255, 255, 255, 0.55);
}

.site-header--academic.is-scrolled .site-header__search--inline.site-header__search--reveal .site-header__search-input::placeholder,
.site-header--academic .site-header__search--inline.site-header__search--reveal.site-header__search--expanded .site-header__search-input::placeholder,
.site-header--academic .site-header__search--inline.site-header__search--force-open .site-header__search-input::placeholder {
  color: rgba(255, 255, 255, 0.62);
}

.site-header--academic .site-header__search--inline.site-header__search--reveal .site-header__search-input:focus {
  outline: none;
  background: transparent;
  border: none;
  box-shadow: none;
}

.site-header--academic .site-header__search--inline.site-header__search--reveal .site-header__search-btn {
  position: absolute;
  top: 0;
  right: 0;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: var(--site-header-search-size);
  height: var(--site-header-search-size);
  margin: 0;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: #fff;
  box-shadow: none;
}

.site-header--academic:not(.is-scrolled) .site-header__search--inline.site-header__search--reveal:not(.site-header__search--force-open):not(.site-header__search--expanded) .site-header__search-btn:hover {
  background: transparent;
  color: rgba(255, 255, 255, 0.82);
}

.site-header--academic .site-header__search--inline.site-header__search--reveal .site-header__search-btn:hover {
  background: rgba(255, 255, 255, 0.24);
  color: #fff;
  border: none;
  box-shadow: none;
}

.site-header--academic.is-scrolled .site-header__search--inline.site-header__search--reveal .site-header__search-btn:hover,
.site-header--academic .site-header__search--inline.site-header__search--reveal.site-header__search--expanded .site-header__search-btn:hover,
.site-header--academic .site-header__search--inline.site-header__search--force-open .site-header__search-btn:hover {
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
}

/* 主导航行（与顶栏同色，无独立深色条带） */
.site-header--academic .site-header__nav-band {
  background: transparent;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}

.site-header--academic.is-scrolled .site-header__nav-band {
  background: transparent;
}

.site-header--academic .site-header__nav-band-inner {
  box-sizing: border-box;
  width: 100%;
  min-width: 0;
  padding-top: 0.35rem;
  padding-bottom: 0.4rem;
}

.site-header--academic .site-header__nav-band .site-header__nav-track {
  width: 100%;
}

.site-header--academic .site-header__nav-band .site-header__nav-scroll {
  width: 100%;
  justify-content: flex-start;
}

@media (prefers-reduced-motion: reduce) {
  .site-header--academic .site-header__academic-shell,
  .site-header--academic .site-header__academic-inner,
  .site-header--academic .site-header__brand-logo-wrap,
  .site-header--academic .site-header__labtitle,
  .site-header--academic .site-header__labtitle-en,
  .site-header--academic .site-header__brand-sep,
  .site-header--academic .site-header__search--inline.site-header__search--reveal,
  .site-header--academic .site-header__search--inline.site-header__search--reveal .site-header__search-input {
    transition: none;
  }
}

/* 主导航：外层不裁切下拉；横向滚动仅作用于 .site-header__nav-scroll 内层 */
.site-header--academic .site-header__nav-track {
  position: relative;
  z-index: 10;
  min-width: 0;
  overflow: visible;
}

.site-header--academic .site-header__nav-scroll {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior-x: contain;
  /* 隐藏横/纵滚动条轨道，仍可用滚轮、触控板、拖动横向滚动（下拉由 header.js fixed 层承担） */
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.site-header--academic .site-header__nav-scroll::-webkit-scrollbar {
  display: none;
  width: 0;
  height: 0;
}

@media (min-width: 768px) {
  .site-header--academic .site-header__nav-track {
    flex: 1 1 auto;
  }
}

/* 品牌：中文题名 + 英文副题（与版心 #f9fafb 黑白灰协调） */
.site-header--academic .site-header__identity {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 0.12rem;
  min-width: 0;
  flex: 1 1 auto;
}

.site-header--academic .site-header__brand-link {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.55rem 0.65rem;
  max-width: 100%;
  min-width: 0;
  text-decoration: none;
  color: inherit;
}

/* 横版校徽 PNG：完整展示官方「兰州大学」书法字（方案 A） */
.site-header--academic .site-header__brand-logo-wrap {
  flex-shrink: 0;
  width: auto;
  height: clamp(3.75rem, 6.5vw, 5.25rem);
  overflow: visible;
  border-radius: 0;
}

.site-header--academic .site-header__brand-logo {
  display: block;
  height: 100%;
  width: auto;
  max-width: min(19.5rem, 48vw);
  object-fit: contain;
  object-position: left center;
  filter: brightness(0) invert(1);
}

.site-header--academic .site-header__brand-sep {
  flex-shrink: 0;
  align-self: center;
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: clamp(1.1rem, 1vw + 0.85rem, 1.35rem);
  font-weight: 300;
  line-height: 1;
  color: rgba(255, 255, 255, 0.42);
  user-select: none;
}

.site-header--academic .site-header__brand-lines {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 0.08rem;
  min-width: 0;
  flex: 1 1 12rem;
}

.site-header--academic:not(.is-scrolled) .site-header__brand-link:hover .site-header__labtitle {
  color: #f8fafc;
}

.site-header--academic:not(.is-scrolled) .site-header__brand-link:hover .site-header__labtitle-en {
  color: rgba(250, 250, 250, 0.95);
}

.site-header--academic.is-scrolled .site-header__brand-link:hover .site-header__labtitle,
.site-header--academic.is-scrolled .site-header__brand-link:hover .site-header__labtitle-en {
  color: #f8fafc;
}

.site-header--academic .site-header__labtitle {
  display: block;
  margin: 0;
  font-family: "Ma Shan Zheng", "STKaiti", "KaiTi", "FangSong", "SimSun", serif;
  font-weight: 700;
  font-size: clamp(1.52rem, 1.28rem + 1.15vw, 2.08rem);
  line-height: 1.4;
  letter-spacing: 0.06em;
  color: #f8fafc;
  text-align: left;
  text-shadow:
    0 2px 24px rgba(0, 0, 0, 0.45),
    0 0 40px rgba(232, 197, 71, 0.18);
  max-width: 100%;
}

.site-header--academic .site-header__labtitle-en {
  display: block;
  margin: 0;
  width: 100%;
  max-width: 100%;
  font-family: Arial, "Helvetica Neue", Inter, "Segoe UI", sans-serif;
  font-weight: 400;
  font-size: clamp(0.78rem, 0.45vw + 0.62rem, 0.9375rem);
  letter-spacing: 0.015em;
  line-height: 1.35;
  color: rgba(255, 255, 255, 0.88);
  text-wrap: balance;
}

.site-header--academic.is-scrolled .site-header__labtitle {
  color: #f8fafc;
  text-shadow:
    0 2px 24px rgba(0, 0, 0, 0.45),
    0 0 40px rgba(232, 197, 71, 0.18);
}

.site-header--academic.is-scrolled .site-header__labtitle-en {
  color: rgba(255, 255, 255, 0.88);
}

.site-header--academic.is-scrolled .site-header__brand-link:focus-visible {
  outline-color: #ffffff;
}

@media (max-width: 767.98px) {
  .site-header--academic .site-header__identity-row {
    align-items: center;
    gap: 0.5rem;
    padding-top: 0.35rem;
    padding-bottom: 0.35rem;
  }

  .site-header--academic .site-header__brand-link {
    flex-wrap: nowrap;
    gap: 0.35rem 0.45rem;
    align-items: center;
  }

  .site-header--academic .site-header__brand-logo-wrap {
    height: 2.65rem;
  }

  .site-header--academic .site-header__brand-logo {
    max-width: min(7.5rem, 34vw);
  }

  .site-header--academic .site-header__brand-sep {
    font-size: 1rem;
  }

  .site-header--academic .site-header__brand-lines {
    flex: 1 1 auto;
    gap: 0.04rem;
  }

  .site-header--academic .site-header__labtitle {
    font-size: clamp(0.95rem, 3.6vw, 1.2rem);
    line-height: 1.3;
    letter-spacing: 0.03em;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    overflow: hidden;
    word-break: break-word;
    overflow-wrap: anywhere;
  }

  .site-header--academic .site-header__labtitle-en {
    font-size: clamp(0.62rem, 2.2vw, 0.72rem);
    line-height: 1.3;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 1;
    line-clamp: 1;
    overflow: hidden;
  }

  .site-header--academic .site-header__menu-btn .site-header__icon-square {
    width: 2.2rem;
    height: 2.2rem;
  }

  .site-header--academic .site-header__mobile-search-btn {
    width: 2.75rem;
    height: 2.75rem;
  }

  .site-header--academic .site-header__mobile-link--sub {
    padding-top: 0.7rem;
    padding-bottom: 0.7rem;
  }

  .site-header--academic .site-header__mobile-lab {
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    overflow: hidden;
    word-break: break-word;
  }

  .site-header--academic .site-header__mobile-lab-en {
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    overflow: hidden;
  }
}

@media (max-width: 390px) {
  .site-header--academic .site-header__labtitle-en {
    display: none;
  }

  .site-header--academic .site-header__brand-sep {
    display: none;
  }
}

@media (min-width: 768px) {
  .site-header--academic .site-header__brand-link {
    max-width: 100%;
    flex-wrap: nowrap;
  }
}

.site-header--academic .site-header__brand-link:focus-visible {
  outline: 2px solid #fafafa;
  outline-offset: 3px;
}

/* 主导航：WHU 课题组站 — 版心内左对齐、仅悬停高亮 */
.site-header--academic .site-nav-primary {
  overflow: visible;
  width: 100%;
  justify-content: flex-start;
  gap: 0 0.85rem;
  font-family: "Microsoft YaHei", "PingFang SC", "SimSun", sans-serif;
}

.site-header--academic .site-nav-primary .nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  flex: 0 1 auto;
  min-width: 0;
  min-height: 3.25rem;
  padding: 0.62rem 1.45rem;
  font-size: 1.0625rem;
  font-weight: 400;
  letter-spacing: 0.01em;
  line-height: 1.3;
  color: #fff;
  text-decoration: none;
  border-radius: 0;
  border-right: none;
  margin-bottom: 0;
  text-align: center;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.site-header--academic .site-nav-primary > .nav-link:last-child,
.site-header--academic .site-nav-primary > .site-nav-item--dropdown:last-child > .nav-link {
  border-right: none;
}

.site-header--academic.is-scrolled .site-nav-primary .nav-link {
  color: #fff;
}

@media (min-width: 1024px) {
  .site-header--academic .site-nav-primary {
    gap: 0 1.05rem;
  }

  .site-header--academic .site-nav-primary .nav-link {
    min-height: 3.5rem;
    padding: 0.68rem 1.65rem;
    font-size: 1.125rem;
  }
}

@media (min-width: 1280px) {
  .site-header--academic .site-nav-primary {
    gap: 0 1.25rem;
  }

  .site-header--academic .site-nav-primary .nav-link {
    min-height: 3.625rem;
    padding: 0.72rem 1.85rem;
    font-size: 1.125rem;
  }
}

.site-header--academic .site-nav-primary .nav-link::after {
  display: none !important;
  content: none !important;
}

.site-header--academic .site-nav-primary .nav-link:hover,
.site-header--academic .site-nav-item--dropdown:hover > .nav-link {
  color: #ffffff;
  font-weight: 500;
  background: rgba(255, 255, 255, 0.12);
}

.site-header--academic .site-nav-primary .nav-link:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.95);
  outline-offset: -2px;
  z-index: 1;
}

.site-header--academic.is-scrolled .site-nav-primary .nav-link:focus-visible {
  outline-color: rgba(255, 255, 255, 0.95);
}

.site-header--academic:not(.is-scrolled) .site-header__search--inline.site-header__search--reveal:not(.site-header__search--force-open):not(.site-header__search--expanded) .site-header__search-btn:focus-visible,
.site-header--academic .site-header__mobile-search-btn:focus-visible {
  outline: 2px solid rgba(250, 250, 250, 0.95);
  outline-offset: 2px;
}

.site-header--academic.is-scrolled .site-header__search--inline.site-header__search--reveal .site-header__search-btn:focus-visible,
.site-header--academic .site-header__search--inline.site-header__search--reveal.site-header__search--expanded .site-header__search-btn:focus-visible {
  outline: 2px solid rgba(0, 0, 0, 0.35);
  outline-offset: 2px;
}

/* 主导航：团队动态悬停下拉 */
.site-header--academic .site-nav-item--dropdown {
  position: relative;
  display: inline-flex;
  flex: 0 1 auto;
  flex-direction: column;
  align-items: stretch;
  min-width: 0;
  vertical-align: bottom;
  z-index: 40;
  border-right: none;
}

.site-header--academic .site-nav-item--dropdown:last-child {
  border-right: none;
}

.site-header--academic .site-nav-item--dropdown > .nav-link {
  white-space: nowrap;
  border-right: none;
  width: 100%;
}

/* 下拉面板：与顶栏同色，白字子项 */
.site-header--academic .site-nav-dropdown {
  position: absolute;
  left: 50%;
  right: auto;
  top: calc(100% - 1px);
  min-width: 10rem;
  padding: 0;
  margin: 0;
  list-style: none;
  background-color: var(--academic-nav-bg, #94070a);
  border: 1px solid rgba(0, 0, 0, 0.22);
  border-radius: 0;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.08),
    0 10px 28px rgba(0, 0, 0, 0.22);
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transform: translate(-50%, -4px);
  pointer-events: none;
  transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s;
  z-index: 50;
}

/* 桌面：由 header.js 在展开时加上，脱离 .site-header__nav-scroll 的 overflow 裁切；z 高于同排工具区 */
.site-header--academic .site-nav-dropdown.site-nav-dropdown--layer-top {
  position: fixed;
  right: auto;
  z-index: 200;
}

.site-header--academic .site-nav-item--dropdown:hover .site-nav-dropdown,
.site-header--academic .site-nav-item--dropdown:focus-within .site-nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
  pointer-events: auto;
}

.site-header--academic .site-nav-dropdown__link {
  display: block;
  box-sizing: border-box;
  width: 100%;
  min-width: 9.5rem;
  padding: 0.72rem 1.45rem;
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  font-size: 1.0625rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1.45;
  text-align: center;
  color: rgba(255, 255, 255, 0.92);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.site-header--academic .site-nav-dropdown__link:last-child {
  border-bottom: none;
}

.site-header--academic .site-nav-dropdown__link:hover,
.site-header--academic .site-nav-dropdown__link:focus-visible {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.14);
  font-weight: 500;
  outline: none;
}

.site-header--academic .site-nav-dropdown__link--active {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.1);
  font-weight: 500;
}

/* 移动端抽屉内搜索 */
.site-header--academic .site-header__mobile-search {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  box-sizing: border-box;
  width: 100%;
  margin: 0;
  padding: 0 var(--site-layout-gutter) 0.75rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.site-header--academic .site-header__mobile-search--flush {
  padding-top: 0.85rem;
}

.site-header--academic .site-header__mobile-search-input {
  box-sizing: border-box;
  flex: 1 1 auto;
  min-width: 0;
  height: 2.35rem;
  padding: 0 0.85rem;
  font-size: 0.875rem;
  color: #171717;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 0;
  box-shadow: none;
}

@media (max-width: 767.98px) {
  .site-header--academic .site-header__mobile-search-input {
    height: 2.75rem;
    font-size: 1rem;
  }
}

.site-header--academic .site-header__mobile-search-input::placeholder {
  color: rgba(23, 23, 23, 0.45);
}

.site-header--academic .site-header__mobile-search-input:focus {
  outline: none;
  border-color: rgba(255, 255, 255, 0.75);
  background: #fff;
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.18);
}

.site-header--academic .site-header__mobile-search-btn {
  display: inline-flex;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  width: 2.35rem;
  height: 2.35rem;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: 0;
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.site-header--academic .site-header__mobile-search-btn:hover {
  border-color: rgba(255, 255, 255, 0.65);
  background: rgba(255, 255, 255, 0.22);
}

.site-header--academic .site-header__menu-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  min-width: 2.75rem;
  min-height: 2.75rem;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: none;
  border-radius: 0;
  background: transparent;
  color: #fafafa;
  cursor: pointer;
  transition: background 0.3s ease, border-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
}

.site-header--academic .site-header__menu-btn .site-header__icon-square {
  box-sizing: border-box;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border: 1px solid currentColor;
  background: rgba(255, 255, 255, 0.08);
}

.site-header--academic .site-header__menu-btn:focus-visible {
  outline: 2px solid rgba(250, 250, 250, 0.95);
  outline-offset: 2px;
}

.site-header--academic.is-scrolled .site-header__menu-btn:focus-visible {
  outline-color: rgba(255, 255, 255, 0.95);
}

.site-header--academic .site-header__menu-btn:hover {
  color: #ffffff;
}

.site-header--academic .site-header__menu-btn:hover .site-header__icon-square {
  background: rgba(255, 255, 255, 0.14);
}

.site-header--academic.is-scrolled .site-header__menu-btn {
  color: #fafafa;
}

.site-header--academic.is-scrolled .site-header__menu-btn .site-header__icon-square {
  border-color: currentColor;
  background: rgba(255, 255, 255, 0.08);
}

.site-header--academic.is-scrolled .site-header__menu-btn:hover .site-header__icon-square {
  background: rgba(255, 255, 255, 0.14);
}

@media (min-width: 768px) {
  .site-header--academic .site-header__menu-btn {
    display: none;
  }
}

.site-header--academic .site-header__mobile {
  background: var(--academic-nav-bg, #94070a);
  border-bottom: 1px solid rgba(0, 0, 0, 0.18);
}

/* 移动端：固定视口全屏层，北大红实底 */
@media (max-width: 767.98px) {
  .site-header--academic #mobileMenu:not(.hidden) {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--site-academic-mobile-menu-top, 8.625rem);
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 9990;
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    background: var(--academic-nav-bg, #94070a);
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    border-bottom: none;
  }
}

@media (min-width: 768px) {
  .site-header--academic #mobileMenu:not(.hidden) {
    display: none !important;
  }
}

.site-header--academic .site-header__mobile-brand {
  padding-left: var(--site-layout-gutter);
  padding-right: var(--site-layout-gutter);
  padding-bottom: 0.65rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  text-align: left;
}

.site-header--academic .site-header__mobile-brand-link {
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
  text-decoration: none;
  color: inherit;
}

.site-header--academic .site-header__brand-logo-wrap--mobile {
  width: auto;
  height: clamp(2.65rem, 12vw, 3.35rem);
  margin-top: 0;
}

.site-header--academic .site-header__brand-logo-wrap--mobile .site-header__brand-logo {
  max-width: min(15.5rem, 74vw);
}

.site-header--academic .site-header__mobile-brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-width: 0;
  flex: 1 1 auto;
}

.site-header--academic .site-header__mobile-lab {
  margin: 0;
  font-family: "Ma Shan Zheng", "STKaiti", "KaiTi", "FangSong", "SimSun", serif;
  font-size: clamp(1.12rem, 4.5vw, 1.35rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.4;
  color: #f8fafc;
  text-shadow:
    0 2px 24px rgba(0, 0, 0, 0.45),
    0 0 40px rgba(232, 197, 71, 0.18);
}

.site-header--academic .site-header__mobile-lab-en {
  margin: 0;
  max-width: 42rem;
  font-size: 0.75rem;
  font-weight: 400;
  line-height: 1.4;
  letter-spacing: 0.02em;
  color: rgba(255, 255, 255, 0.82);
}

.site-header--academic .site-header__mobile-utility {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  gap: 0.45rem 0.55rem;
  padding: 0.65rem var(--site-layout-gutter) 0.35rem;
}

.site-header--academic .site-header__mobile-utility-link {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.82);
  text-decoration: none;
}

.site-header--academic .site-header__mobile-utility-link:hover {
  color: #ffffff;
  text-decoration: underline;
}

.site-header--academic .site-header__mobile-utility-sep {
  color: rgba(255, 255, 255, 0.35);
  font-size: 0.75rem;
}

.site-header--academic .site-header__mobile-nav {
  display: flex;
  flex-direction: column;
  box-sizing: border-box;
  width: 100%;
  margin: 0;
  padding: 0 var(--site-layout-gutter) 1rem;
}

.site-header--academic .site-header__mobile-link {
  padding: 0.9rem 0;
  font-size: 1.0625rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.92);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  transition: color 0.2s ease, background 0.2s ease;
}

.site-header--academic .site-header__mobile-link:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.1);
}

.site-header--academic .site-header__mobile-link--active {
  color: rgba(255, 255, 255, 0.92);
  font-weight: 500;
  border-left: none;
  padding-left: 0;
  margin-left: 0;
  background: transparent;
}

.site-header--academic .site-header__mobile-link--sub {
  padding-top: 0.45rem;
  padding-bottom: 0.45rem;
  padding-left: 1rem;
  font-size: 0.875rem;
  font-weight: 400;
  color: rgba(255, 255, 255, 0.72);
}

.site-header--academic .site-header__mobile-link--sub:hover {
  color: #ffffff;
}

.site-header--academic .site-header__mobile-link:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.9);
  outline-offset: 2px;
}

/* 主导航行：工具区（移动端汉堡） */
.site-header--academic .site-header__toolbar {
  position: relative;
  z-index: 1;
}