/* 页面内容直接写在 HTML 中；菜单和内容切换使用浏览器原生控件。 */

.carousel-choice,
.menu-switch {
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.menu-switch,
.submenu-toggle,
.nav-directory {
  display: none;
}

.static-site.home-page .header-bg {
  background: linear-gradient(180deg, #073f80, rgba(3, 56, 119, 0.96));
}

.header-directory {
  min-height: 36px;
  padding: 4px 14px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 4px;
  font-size: 17px;
  line-height: 1.5;
}

.header-directory:hover,
.header-directory:focus-visible {
  color: #fff;
  background: rgba(255, 255, 255, 0.14);
}

.header-directory > span {
  font-size: 24px;
  line-height: 1;
}

.header-language {
  cursor: default;
}

/* 侧栏使用 details / summary，展开状态由 HTML 的 open 属性保存。 */
.side-branch-toggle {
  list-style: none;
}

.side-branch-toggle::-webkit-details-marker {
  display: none;
}

.side-menu-branch[open] > .side-branch-panel {
  max-height: none;
  overflow: visible;
}

/* 顶部导航只保留两级；手机主菜单和二级栏目由原生复选框展开。 */
@media (max-width: 1100px) {
  .menu-switch {
    display: block;
  }

  .static-site .main-nav {
    position: absolute;
    z-index: 70;
    top: 100%;
    left: 0;
    width: 100%;
    max-height: calc(100svh - 100px);
    margin-top: 0;
    overscroll-behavior: contain;
  }

  .main-menu-switch:checked ~ .main-nav {
    display: flex;
  }

  .main-menu-switch:checked + .mobile-nav-toggle span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .main-menu-switch:checked + .mobile-nav-toggle span:nth-child(2) {
    opacity: 0;
  }

  .main-menu-switch:checked + .mobile-nav-toggle span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .menu-switch:focus-visible + label {
    outline: 3px solid #83e8ff;
    outline-offset: 2px;
  }

  .static-site .nav-directory {
    display: block;
  }

  .static-site .main-nav .has-dropdown {
    position: relative;
  }

  .static-site .main-nav .has-dropdown > .nav-link {
    padding-right: 48px;
  }

  .static-site .main-nav .has-dropdown > .nav-link::after {
    display: none;
  }

  .static-site .main-nav .submenu-toggle {
    position: absolute;
    top: 0;
    right: 0;
    width: 42px;
    min-height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 4px;
    cursor: pointer;
  }

  .submenu-toggle > span {
    width: 8px;
    height: 8px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg);
    transition: transform 0.2s ease;
  }

  .menu-switch:checked + .submenu-toggle > span {
    transform: rotate(225deg);
  }

  .static-site .main-nav .category-switch:checked ~ .nav-dropdown {
    display: grid !important;
  }
}

/* 每条新闻、每期海报都拥有独立的 HTML 内容。单选框只切换显示。 */
.carousel-step {
  display: none;
  align-items: center;
  gap: inherit;
}

.hero-arrow-group .carousel-step {
  width: 100%;
  justify-content: space-between;
}

.edit-feature .lead-slide {
  visibility: hidden;
}

.research-news-slide,
.research-showcase-side > .research-side-feature,
.poster-research-summary {
  display: none;
}

.research-arrow,
.poster-arrow,
.research-side-feature footer label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.poster-figure .poster-accordion .poster-slide {
  opacity: 1;
  transform: none;
}

.poster-figure .poster-accordion .poster-slide img {
  object-fit: contain;
  background: #07568c;
  filter: none;
}

.poster-figure .poster-accordion .poster-slide span {
  opacity: 0;
  pointer-events: none;
}

.static-site .student-band .poster-accordion .poster-controls {
  top: 16px;
  right: 16px;
  bottom: auto;
  left: auto;
}

.student-portal-tabs {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.static-site .student-band .topic-figure.poster-figure {
  height: auto;
  flex-basis: auto;
}

@media (max-width: 1100px) {
  .poster-accordion {
    margin-bottom: 52px;
  }

  .poster-research-summary h4 {
    max-width: none;
    display: block;
    overflow: visible;
  }
}

.research-showcase-controls label,
.lead-pager label,
.poster-controls label,
.research-side-feature footer label {
  cursor: pointer;
}

.static-site .poster-controls label,
.static-site .research-showcase-controls label,
.static-site .research-side-feature footer label {
  transform: none;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.research-showcase-controls .carousel-step {
  gap: 8px;
}

.research-side-feature footer label:hover,
.research-side-feature footer label:focus-visible {
  transform: none;
}

.research-showcase-side {
  position: relative;
}

/* 首页图片 */
#hero-1:checked ~ .hero-slider .hero-slide--1,
#hero-2:checked ~ .hero-slider .hero-slide--2,
#hero-3:checked ~ .hero-slider .hero-slide--3,
#hero-4:checked ~ .hero-slider .hero-slide--4,
#hero-5:checked ~ .hero-slider .hero-slide--5 {
  opacity: 1;
  transform: scale(1.09);
}

#hero-1:checked ~ .hero-dots [for="hero-1"] img,
#hero-2:checked ~ .hero-dots [for="hero-2"] img,
#hero-3:checked ~ .hero-dots [for="hero-3"] img,
#hero-4:checked ~ .hero-dots [for="hero-4"] img,
#hero-5:checked ~ .hero-dots [for="hero-5"] img {
  display: block;
}

#hero-1:checked ~ .hero-dots [for="hero-1"] span,
#hero-2:checked ~ .hero-dots [for="hero-2"] span,
#hero-3:checked ~ .hero-dots [for="hero-3"] span,
#hero-4:checked ~ .hero-dots [for="hero-4"] span,
#hero-5:checked ~ .hero-dots [for="hero-5"] span {
  display: none;
}

#hero-1:checked ~ .hero-arrow-group .carousel-step--1,
#hero-2:checked ~ .hero-arrow-group .carousel-step--2,
#hero-3:checked ~ .hero-arrow-group .carousel-step--3,
#hero-4:checked ~ .hero-arrow-group .carousel-step--4,
#hero-5:checked ~ .hero-arrow-group .carousel-step--5 {
  display: flex;
}

#hero-1:focus-visible ~ .hero-dots [for="hero-1"],
#hero-2:focus-visible ~ .hero-dots [for="hero-2"],
#hero-3:focus-visible ~ .hero-dots [for="hero-3"],
#hero-4:focus-visible ~ .hero-dots [for="hero-4"],
#hero-5:focus-visible ~ .hero-dots [for="hero-5"] {
  outline: 3px solid #83e8ff;
  outline-offset: 4px;
}

/* 学院头条 */
#lead-1:checked ~ .lead-slide--1,
#lead-2:checked ~ .lead-slide--2,
#lead-3:checked ~ .lead-slide--3 {
  z-index: 1;
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

#lead-1:checked ~ .lead-pager [for="lead-1"],
#lead-2:checked ~ .lead-pager [for="lead-2"],
#lead-3:checked ~ .lead-pager [for="lead-3"] {
  width: 70px;
  border-radius: 999px;
  color: transparent;
  background: var(--cyan);
  box-shadow: 0 8px 18px rgba(66, 194, 255, 0.26);
}

#lead-1:focus-visible ~ .lead-pager [for="lead-1"],
#lead-2:focus-visible ~ .lead-pager [for="lead-2"],
#lead-3:focus-visible ~ .lead-pager [for="lead-3"] {
  outline: 3px solid #0759b5;
  outline-offset: 4px;
}

/* 科学研究 */
#research-1:checked ~ .research-news-slide--1,
#research-2:checked ~ .research-news-slide--2,
#research-3:checked ~ .research-news-slide--3,
#research-4:checked ~ .research-news-slide--4 {
  display: contents;
}

#research-1:checked ~ .research-showcase-controls [for="research-1"].research-index,
#research-2:checked ~ .research-showcase-controls [for="research-2"].research-index,
#research-3:checked ~ .research-showcase-controls [for="research-3"].research-index,
#research-4:checked ~ .research-showcase-controls [for="research-4"].research-index {
  font-size: 38px;
  line-height: 1;
  opacity: 1;
}

#research-1:checked ~ .research-showcase-controls .carousel-step--1,
#research-2:checked ~ .research-showcase-controls .carousel-step--2,
#research-3:checked ~ .research-showcase-controls .carousel-step--3,
#research-4:checked ~ .research-showcase-controls .carousel-step--4 {
  display: flex;
}

#research-1:focus-visible ~ .research-showcase-controls [for="research-1"].research-index,
#research-2:focus-visible ~ .research-showcase-controls [for="research-2"].research-index,
#research-3:focus-visible ~ .research-showcase-controls [for="research-3"].research-index,
#research-4:focus-visible ~ .research-showcase-controls [for="research-4"].research-index {
  outline: 3px solid #83e8ff;
  outline-offset: 4px;
}

/* 人才培养 */
#talent-1:checked ~ .talent-news-slide--1,
#talent-2:checked ~ .talent-news-slide--2,
#talent-3:checked ~ .talent-news-slide--3,
#talent-4:checked ~ .talent-news-slide--4 {
  display: grid;
}

#talent-1:focus-visible ~ .talent-news-slide--1,
#talent-2:focus-visible ~ .talent-news-slide--2,
#talent-3:focus-visible ~ .talent-news-slide--3,
#talent-4:focus-visible ~ .talent-news-slide--4 {
  outline: 3px solid #448dcc;
  outline-offset: 4px;
}

/* 论坛海报与对应的主题、报告人、时间、地点。 */
#poster-1:checked ~ .poster-accordion .poster-slide--1,
#poster-2:checked ~ .poster-accordion .poster-slide--2,
#poster-3:checked ~ .poster-accordion .poster-slide--3,
#poster-4:checked ~ .poster-accordion .poster-slide--4,
#poster-5:checked ~ .poster-accordion .poster-slide--5,
#poster-1:checked ~ .poster-summary--1,
#poster-2:checked ~ .poster-summary--2,
#poster-3:checked ~ .poster-summary--3,
#poster-4:checked ~ .poster-summary--4,
#poster-5:checked ~ .poster-summary--5 {
  display: block;
}

#poster-1:checked ~ .poster-accordion .poster-controls .carousel-step--1,
#poster-2:checked ~ .poster-accordion .poster-controls .carousel-step--2,
#poster-3:checked ~ .poster-accordion .poster-controls .carousel-step--3,
#poster-4:checked ~ .poster-accordion .poster-controls .carousel-step--4,
#poster-5:checked ~ .poster-accordion .poster-controls .carousel-step--5 {
  display: flex;
}

#poster-1:focus-visible ~ .poster-accordion .poster-slide--1,
#poster-2:focus-visible ~ .poster-accordion .poster-slide--2,
#poster-3:focus-visible ~ .poster-accordion .poster-slide--3,
#poster-4:focus-visible ~ .poster-accordion .poster-slide--4,
#poster-5:focus-visible ~ .poster-accordion .poster-slide--5 {
  outline: 3px solid #83e8ff;
  outline-offset: 4px;
}

@media (max-width: 680px) {
  #lead-1:checked ~ .lead-pager [for="lead-1"],
  #lead-2:checked ~ .lead-pager [for="lead-2"],
  #lead-3:checked ~ .lead-pager [for="lead-3"] {
    width: 44px;
  }
}

/* 保留原生横向滚动；鼠标、触屏和方向键均可浏览所有条目。 */
.discipline-viewport,
.special-column-viewport {
  overflow-x: auto;
  scrollbar-width: thin;
  scrollbar-color: #448dcc transparent;
}

.discipline-viewport::-webkit-scrollbar,
.special-column-viewport::-webkit-scrollbar {
  display: block;
  height: 6px;
}

.discipline-viewport::-webkit-scrollbar-thumb,
.special-column-viewport::-webkit-scrollbar-thumb {
  background: #448dcc;
  border-radius: 3px;
}

.discipline-viewport:focus-visible,
.special-column-viewport:focus-visible {
  outline: 3px solid #448dcc;
  outline-offset: 4px;
}

/* 组织机构通过真实的页内锚点定位，所有板块始终存在于文档中。 */
.org-section-nav {
  top: 94px;
}

.org-overview-block {
  scroll-margin-top: 120px;
}

@media (min-width: 681px) and (max-width: 1280px) {
  .org-overview-block {
    scroll-margin-top: 160px;
  }
}

@media (max-width: 680px) {
  .org-overview-block {
    scroll-margin-top: 220px;
  }
}

.page-panel:not(:has(.org-overview-block:target)) .org-section-nav a:first-child,
.page-panel:has(#org-management:target) .org-section-nav a[href="#org-management"],
.page-panel:has(#org-teaching:target) .org-section-nav a[href="#org-teaching"],
.page-panel:has(#org-platforms:target) .org-section-nav a[href="#org-platforms"],
.page-panel:has(#org-academic:target) .org-section-nav a[href="#org-academic"],
.page-panel:has(#org-party:target) .org-section-nav a[href="#org-party"] {
  color: #fff;
  border-color: var(--blue-800);
  background: var(--blue-800);
  box-shadow: 0 5px 12px rgba(7, 89, 181, 0.23);
}

/* 站内导航直接列出全部页面，不需要请求页面数据或等待检索脚本。 */
.directory-intro {
  margin: 0 0 22px;
  color: #607086;
  font-size: 16px;
  line-height: 1.8;
}

.directory-shortcuts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

.directory-shortcuts a {
  padding: 8px 14px;
  border: 1px solid #cadcf0;
  border-radius: 4px;
  color: #135898;
  background: #f4f8ff;
}

.directory-section {
  padding: 24px 0;
  border-top: 1px solid #dce7f3;
  scroll-margin-top: 100px;
}

.directory-section h2 {
  margin: 0 0 16px;
  color: #164577;
  font-size: 23px;
}

.directory-links {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.directory-links a {
  display: block;
  padding: 10px 12px;
  height: 100%;
  color: #334e6d;
  background: #f7faff;
  border-radius: 4px;
  line-height: 1.6;
}

.directory-links a:hover,
.directory-links a:focus-visible,
.directory-shortcuts a:hover,
.directory-shortcuts a:focus-visible {
  color: #0759b5;
  background: #e8f2ff;
}

@media (max-width: 900px) {
  .directory-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 540px) {
  .directory-links {
    grid-template-columns: minmax(0, 1fr);
  }

  .directory-section h2 {
    font-size: 21px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero-slide,
  .edit-feature .lead-slide {
    transition: none;
  }
}