/* Fudan blue palette (100%, 90%, 80%) */
:root {
  --fudan-blue: #0e419c;
  --fudan-blue-90: #114ebb;
  --fudan-blue-80: #145bda;
  --fudan-blue-dark: #08306f;
  --mist: #f1f5ff;
  --sand-light: #eef3ff;
  --text: #213047;
  --text-soft: #4f5f7b;
  --border: #c5d4ef;
  --white: #ffffff;
  --shadow-color: rgba(14, 65, 156, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  height: 100%;
}

body {
  font-family: 'Roboto', sans-serif;
  font-weight: 300;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  margin: 0;
  padding-top: 56px;
  background-color: var(--sand-light);
  min-height: 100%;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 400;
  margin: 0 0 18px;
  line-height: 1.3;
  color: var(--text);
}

h1 {
  font-size: 36px;
  font-weight: 300;
}

h2 {
  font-size: 28px;
  font-weight: 600;
  color: var(--fudan-blue-90);
}

h3 {
  font-size: 22px;
  font-weight: 500;
}

p {
  margin: 0 0 16px;
}

a {
  color: var(--fudan-blue);
  text-decoration: none;
  font-weight: 400;
}

a:hover,
a:focus {
  color: var(--fudan-blue-80);
  text-decoration: underline;
}

ul {
  margin: 0 0 16px 20px;
  padding: 0;
}

li {
  margin-bottom: 0px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--text-soft);
  margin-bottom: 16px;
}

.breadcrumb a {
  color: var(--fudan-blue-90);
  font-weight: 500;
}

.breadcrumb span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb span + span::before {
  content: "/";
  color: var(--text-soft);
  margin-right: 8px;
}

.breadcrumb .current {
  color: var(--text);
  font-weight: 600;
}

.page-hero {
  background: linear-gradient(135deg, rgba(17, 78, 187, 0.08), rgba(238, 243, 255, 0.9));
  padding: 32px 0;
  border-bottom: 1px solid var(--border);
  margin-top: -56px;
  padding-top: 88px; /* 56px (navbar height) + 32px (original padding) */
}

.page-hero-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

.page-hero-copy {
  max-width: 100%;
  width: 100%;
  min-height: 120px; /* 确保所有页面标题区域高度一致 */
}

.page-hero-copy p {
  color: var(--text-soft);
}

.page-hero-actions {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 24px;
}

/* English homepage: no longer needed as hero-side removed */

.container {
  width: min(1100px, calc(100% - 40px));
  margin: 0 auto;
}

/* People page container - same width as other pages */
#people-main.container {
  width: min(1100px, calc(100% - 40px));
}

/* People content area - extend to the right to fit one more column */
#people-main .people-content {
  max-width: calc(100% + 160px);
}

nav.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 999;
  background-color: var(--fudan-blue);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.16);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 0;
  min-height: 48px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 500;
  color: var(--white);
  letter-spacing: 0.04em;
}

.brand-logo {
  width: 38px;
  height: 38px;
  object-fit: contain;
  display: block;
}

.brand-name {
  color: var(--white);
  font-size: 24px;
  font-weight: 600;
}

.brand:hover {
  color: var(--white);
  text-decoration: none;
}

.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 24px;
  margin: 0;
  padding: 0;
}

.nav-links li {
  margin-bottom: 0;
}

.nav-links a {
  color: var(--mist);
  font-weight: 400;
  letter-spacing: 0.02em;
}

.nav-links a.active {
  color: var(--white);
  font-weight: 600;
}

.nav-links a:hover,
.nav-links a:focus {
  color: var(--white);
  text-decoration: none;
}

.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: none;
  color: var(--white);
  padding: 6px 8px;
  font-size: 14px;
  font-weight: 400;
  cursor: pointer;
  transition: all 0.2s ease;
}

.lang-btn:hover {
  opacity: 0.9;
}

.lang-text {
  font-weight: 400;
  color: var(--mist);
  transition: all 0.2s ease;
}

.lang-text.active {
  color: var(--white);
  font-weight: 600;
}

.lang-separator {
  color: var(--mist);
  font-weight: 300;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.6);
  color: var(--white);
  padding: 8px 10px;
  border-radius: 4px;
}

.nav-toggle .icon-bar {
  display: block;
  width: 20px;
  height: 2px;
  margin: 4px 0;
  background-color: var(--white);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

#hero {
  background: linear-gradient(120deg, var(--mist) 0%, var(--sand-light) 60%, rgba(255, 255, 255, 0.9) 100%);
  padding: 60px 0 60px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
  gap: 48px;
  align-items: center;
}

.hero-full {
  max-width: 100%;
}

.hero-full h1 {
  margin-bottom: 24px;
}

.hero-description {
  max-width: 100%;
  margin-bottom: 32px;
}

.hero-description .lead {
  margin-bottom: 16px;
  line-height: 1.8;
  text-align: justify;
  -webkit-hyphens: auto;
  -moz-hyphens: auto;
  -ms-hyphens: auto;
  hyphens: auto;
}

.hero-description .lead:last-child {
  margin-bottom: 0;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-weight: 500;
  font-size: 13px;
  color: var(--fudan-blue);
  margin-bottom: 12px;
}

.lead {
  font-size: 18px;
  color: var(--text);
}

.highlight {
  font-weight: 500;
  color: var(--fudan-blue);
}

.hero-actions {
  margin-top: 32px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  font-size: 15px;
  font-weight: 500;
  border-radius: 24px;
  border: 2px solid transparent;
  transition: all 0.2s ease;
}

.btn-primary {
  background-color: var(--fudan-blue-90);
  color: var(--white);
  border-color: var(--fudan-blue);
}

.btn-primary:hover,
.btn-primary:focus {
  background-color: var(--fudan-blue-dark);
  border-color: var(--fudan-blue-dark);
}

.btn-outline {
  background-color: transparent;
  color: var(--fudan-blue-90);
  border-color: var(--fudan-blue-90);
}

.btn-outline:hover,
.btn-outline:focus {
  background-color: var(--fudan-blue-90);
  color: var(--white);
}

.btn-inline {
  padding: 6px 14px;
  border-radius: 18px;
  border: 1px solid var(--fudan-blue-90);
  color: var(--fudan-blue-90);
  font-size: 14px;
}

.btn-inline:hover,
.btn-inline:focus {
  background-color: var(--fudan-blue-90);
  color: var(--white);
}

.hero-side {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.hero-panel {
  background-color: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  box-shadow: 0 12px 30px var(--shadow-color);
}

.hero-panel h2 {
  font-size: 20px;
  margin-bottom: 18px;
  color: var(--fudan-blue);
}

.hero-panel ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.hero-panel li {
  padding-left: 22px;
  position: relative;
  font-weight: 400;
}

.hero-panel li::before {
  content: '\2022';
  position: absolute;
  left: 0;
  color: var(--fudan-blue-80);
  font-size: 22px;
  line-height: 1;
  top: 2px;
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}

.hero-meta div {
  background-color: rgba(17, 78, 187, 0.08);
  border-radius: 12px;
  padding: 18px;
  border: 1px solid rgba(17, 78, 187, 0.18);
}

.hero-meta h3 {
  font-size: 28px;
  color: var(--fudan-blue);
  margin-bottom: 8px;
}

.sec {
  padding: 32px 0;
}

.sechighlight {
  background-color: var(--mist);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  scroll-margin-top: 48px;
}

#people, #resources {
  scroll-margin-top: 48px;
}

.pillars-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.pillar-card {
  background-color: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 10px 24px var(--shadow-color);
  display: flex;
  flex-direction: column;
  gap: 0;
}

.pillar-card h3 {
  min-height: 3em;
  display: flex;
  align-items: flex-start;
}

.pillar-card p {
  margin-top: 0;
}

.pillar-card-clickable {
  cursor: pointer;
  transition: all 0.3s ease;
}

.pillar-card-clickable:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px var(--shadow-color);
  border-color: var(--fudan-blue);
}

/* 中文版：所有6个研究方向框的标题间距改为0px */
html[lang="zh-CN"] .pillar-card h3 {
  margin-bottom: 0px;
}

/* 英文版：只有后3个研究方向框（第4、5、6个）的标题间距改为0px */
html[lang="en"] .pillar-card:nth-child(n+4) h3 {
  margin-bottom: 0px;
}

.highlight-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.highlight-card {
  background-color: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 8px 20px var(--shadow-color);
  min-height: 200px;
  display: flex;
  flex-direction: column;
}

.highlight-card h3 {
  min-height: 2.4em;
  line-height: 1.2;
  margin-bottom: 12px;
}

/* 中文版：resources 页面标题下文字上移 */
html[lang="zh-CN"] .highlight-card h3 {
  margin-bottom: 6px;
}

.highlight-card p {
  flex-grow: 1;
  margin-bottom: 15px;
}

.highlight-card a {
  margin-top: auto;
}

/* ========== Research Highlights ========== */
.highlights-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.highlight-item {
  display: flex;
  gap: 24px;
  padding: 20px;
  background-color: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 4px 12px var(--shadow-color);
  transition: all 0.3s ease;
}

.highlight-item:hover {
  transform: translateX(4px);
  box-shadow: 0 6px 16px var(--shadow-color);
}

.highlight-date {
  flex-shrink: 0;
  width: 80px;
  font-weight: 600;
  color: var(--fudan-blue);
  font-size: 14px;
}

.highlight-content {
  flex: 1;
}

.highlight-content h3 {
  margin: 0 0 8px 0;
  font-size: 18px;
  color: var(--text);
}

.highlight-content p {
  margin: 0;
  color: var(--text-light);
  line-height: 1.6;
}

/* ========== Publications ========== */
.publication-section {
  margin-bottom: 48px;
  scroll-margin-top: 100px;
}

.publication-category {
  font-size: 24px;
  color: var(--fudan-blue);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border);
}

.publication-list {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.publication-item {
  margin-bottom: 18px;
  padding-left: 20px;
  position: relative;
  line-height: 1.6;
  font-size: 15px;
  color: var(--text);
}

.publication-item::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--text-light);
  font-size: 18px;
  top: 0;
}

.pub-main-line {
  margin-bottom: 4px;
}

.pub-support {
  font-style: normal;
  color: var(--text-light);
  font-weight: 400;
}

.pub-alphabetical {
  font-style: normal;
  color: var(--text);
  font-weight: 400;
}

.pub-title {
  font-weight: 700;
  color: var(--text);
}

.pub-authors {
  color: var(--text-light);
  font-size: 14px;
  line-height: 1.5;
}

.pub-venue {
  display: inline;
  color: var(--text);
  font-weight: 400;
}

.pub-venue em {
  font-style: normal;
  font-weight: 700;
  color: var(--text);
}

.pub-links {
  display: inline;
  margin-left: 4px;
}

.pub-link {
  color: var(--fudan-blue);
  text-decoration: none;
  font-weight: 400;
  margin: 0 2px;
  transition: color 0.2s;
}

.pub-link:hover {
  color: var(--fudan-red);
  text-decoration: underline;
}

.pub-note {
  margin-top: 12px;
  padding-left: 20px;
  font-size: 13px;
  color: var(--text-light);
  font-style: italic;
}

@media (max-width: 768px) {
  .highlight-item {
    flex-direction: column;
    gap: 12px;
  }
  
  .highlight-date {
    width: auto;
  }
}

.section-subtitle {
  font-size: 20px;
  color: var(--fudan-blue);
  margin-bottom: 32px;
  margin-top: 24px;
}

.team-members {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 20px 12px;
  margin-bottom: 32px;
}

.member-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  min-height: auto;
  padding-bottom: 8px;
}

/* 有链接的成员卡片样式（整个卡片可点击） */
a.member-card-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  min-height: auto;
  padding-bottom: 8px;
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s ease;
}

a.member-card-link:hover {
  transform: translateY(-4px);
}

a.member-card-link .member-photo {
  cursor: pointer;
}

a.member-card-link .member-name {
  color: var(--fudan-blue);
  cursor: pointer;
  transition: color 0.3s ease;
}

a.member-card-link:hover .member-name {
  color: var(--text-soft);
  text-decoration: underline;
}

.member-photo {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--fudan-blue-90);
  box-shadow: 0 4px 12px var(--shadow-color);
  margin-bottom: 10px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.member-photo:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 20px rgba(14, 65, 156, 0.25);
}

.member-name {
  font-size: 16px;
  font-weight: 500;
  color: var(--text);
  margin: 0 0 4px 0;
  line-height: 1.3;
  min-height: 21px;
  height: 21px;
}

/* 有链接的成员名字样式 */
a.member-name-link {
  color: var(--fudan-blue);
  font-weight: 500;
  text-decoration: none;
  transition: all 0.3s ease;
  display: inline-block;
  line-height: 1.3;
  word-break: break-word;
}

a.member-name-link:hover {
  color: var(--text-soft);
  text-decoration: underline;
}

.member-title {
  font-size: 14px;
  color: var(--text-soft);
  margin: 0;
  font-weight: 300;
}

.people-sections {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 32px;
}

.people-card {
  background-color: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 8px 20px var(--shadow-color);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.people-card p {
  margin-bottom: 24px;
  flex-grow: 1;
}

.people-card .btn {
  margin-top: auto;
}

.people-card .link {
  font-weight: 500;
}

.detail-section {
  background-color: var(--white);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  box-shadow: 0 12px 30px var(--shadow-color);
}

.detail-section + .detail-section {
  margin-top: 32px;
}

.detail-content h3 {
  margin-bottom: 8px;
  font-size: 18px;
  font-weight: 600;
}

.detail-content p {
  margin-bottom: 12px;
}

.detail-content strong {
  font-weight: 600;
}

.resource-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

@media (max-width: 600px) {
  .resource-grid {
    grid-template-columns: 1fr;
  }
}

.resource-card {
  background-color: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 8px 20px var(--shadow-color);
  display: flex;
  flex-direction: column;
}

.resource-card h3 {
  min-height: 2.4em;
  line-height: 1.2;
  margin-top: 0;
}

.resource-card p {
  flex-grow: 1;
  margin-bottom: 15px;
}

/* 中文版：资源与软件的3个框的标题间距改为3px */
html[lang="zh-CN"] .resource-card h3 {
  margin-bottom: 3px;
}

/* 英文版：Resources & Software的3个框的标题间距改为3px */
html[lang="en"] #resources .resource-card h3 {
  margin-bottom: 3px;
}

.resource-card > div {
  margin-bottom: 15px;
}

.resource-card .btn {
  margin-top: auto;
}

.cta-band {
  background-color: var(--fudan-blue-90);
  color: var(--white);
  padding: 60px 0;
}

.cta-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.cta-content p {
  color: rgba(255, 255, 255, 0.85);
}

.cta-actions {
  display: flex;
  gap: 16px;
  flex-shrink: 0;
}

.footer {
  background-color: var(--fudan-blue-dark);
  color: var(--mist);
  padding: 48px 0 16px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 0.3fr 1.4fr 1.3fr;
  gap: 24px;
  width: 100%;
}

/* 中文版页脚第一列调整 - 给"联系方式"更多空间 */
html[lang="zh-CN"] .footer-grid {
  grid-template-columns: 0.6fr 1.3fr 1.1fr;
}

.footer h4 {
  color: var(--white);
  font-weight: 500;
  font-size: 18px;
  margin-bottom: 18px;
}

.footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer li {
  margin-bottom: 10px;
  color: var(--mist);
  font-weight: 300;
}

.footer a {
  color: var(--mist);
  font-weight: 300;
}

.footer a:hover,
.footer a:focus {
  color: var(--white);
}

.footer-inline-link {
  color: inherit !important;
  text-decoration: none;
}

.footer-inline-link:hover {
  text-decoration: underline;
  color: inherit !important;
}

.footer-note {
  text-align: center;
  margin-top: 32px;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  font-size: 14px;
  color: rgba(255, 255, 255, 0.75);
}

@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .pillars-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .cta-content {
    flex-direction: column;
    align-items: flex-start;
  }

  .cta-actions {
    flex-wrap: wrap;
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links {
    position: absolute;
    inset: auto 0 0 0;
    background-color: var(--fudan-blue);
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 20px 0;
    transform: translateY(-150%);
    transition: transform 0.3s ease;
  }

  .nav-links.open {
    transform: translateY(0);
  }

  .nav-toggle {
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
  }

  .nav-container {
    position: relative;
  }

  nav.navbar {
    position: fixed;
  }

  .lang-btn {
    margin-top: 8px;
  }

  .pillars-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-wrap: wrap;
  }

  .cta-content {
    gap: 24px;
  }

  .page-hero-content {
    flex-direction: column;
    align-items: flex-start;
  }

  .page-hero-actions {
    width: 100%;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 15px;
  }

  h1 {
    font-size: 30px;
  }

  h2 {
    font-size: 24px;
  }

  .nav-links {
    align-items: stretch;
  }

  .team-members {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 24px 16px;
  }

  .member-photo {
    width: 110px;
    height: 110px;
  }

  .member-name {
    font-size: 15px;
  }

  .member-title {
    font-size: 13px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================ */
/* Alumni Page Styles */
/* ============================================ */

/* Alumni main container alignment */
#alumni-main.container, #people-main.container, #resources-main.container, #research-main.container, #highlights-main.container {
  /* padding-top: 40px !important; */
}

/* Alumni list layout */
.alumni-list {
  margin-top: 16px;
  margin-bottom: 32px;
}

.alumni-row {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 24px;
  padding: 10px 8px;
  margin-bottom: 6px;
  border-radius: 8px;
  font-size: 15px;
  transition: background-color 0.2s ease;
}

.alumni-row:hover {
  background-color: rgba(238, 243, 255, 0.85);
}

.alumni-row .name {
  font-weight: 500;
  color: var(--text);
}

.alumni-row .destination {
  color: var(--text-soft);
  font-weight: 300;
}

/* Alumni name links styling (similar to member-name-link in people page) */
.alumni-name-link {
  color: var(--fudan-blue);
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s ease;
  display: inline-block;
}

.alumni-name-link:hover {
  color: var(--text-soft);
  transform: scale(1.05);
}

/* Webmaster/Dev team name links styling */
.webmaster-link {
  color: var(--fudan-blue);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
}

.webmaster-link:hover {
  color: var(--fudan-red);
  text-decoration: underline;
}

/* Floating sidebar (Table of Contents) */
.toc-sidebar {
  position: fixed;
  right: 24px;
  top: 100px;
  width: 180px;
  max-height: calc(100vh - 140px);
  background: rgba(241, 245, 255, 0.95);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  z-index: 100;
  overflow-y: auto;
  box-shadow: 0 8px 24px rgba(14, 65, 156, 0.15);
}

.toc-sidebar h3 {
  margin: 0 0 16px;
  font-size: 16px;
  color: var(--fudan-blue);
  font-weight: 500;
}

.toc-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.toc-links a {
  display: block;
  text-align: left;
  padding: 8px 12px;
  color: var(--fudan-blue);
  font-weight: 400;
  font-size: 14px;
  border-radius: 6px;
  transition: all 0.2s ease;
}

.toc-links a:hover {
  background: rgba(14, 65, 156, 0.1);
  text-decoration: none;
  padding-left: 16px;
}

.back-to-top {
  display: block;
  width: 100%;
  margin-bottom: 20px;
  background: var(--fudan-blue);
  color: var(--white);
  border: none;
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 400;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.back-to-top:hover {
  background: var(--fudan-blue-dark);
}

/* Prevent fixed navbar from covering anchors */
h2[id],
h3.year-badge {
  scroll-margin-top: 110px;
}

/* Alumni section spacing */
.alumni-dir, .people-dir {
  margin-top: 24px;
}

.alumni-dir .section-subtitle, .people-dir .section-subtitle {
  margin-top: 48px;
  margin-bottom: 20px;
  font-size: 22px;
}

.alumni-dir .section-subtitle:first-of-type, .people-dir .section-subtitle:first-of-type {
  margin-top: 24px;
}

/* Responsive design for alumni page */
@media (max-width: 1280px) {
  .toc-sidebar {
    display: none;
  }
  
  .people-content, .alumni-content, .resources-content {
    margin-right: 0;
  }
}

/* 中等大屏到超大屏：margin-right 线性变化 (1280px→110px, 1920px→-20px) */
@media (min-width: 1280px) and (max-width: 1920px) {
  .people-content, .alumni-content, .resources-content {
    margin-right: calc(110px - (100vw - 1280px) * 130 / 640);
    /* 计算公式: 110px - (当前宽度 - 1280px) * (110px - -20px) / (1920px - 1280px) */
  }
  
  .team-members {
    gap: 20px 12px; /* 保持最小列间距 12px */
  }
}

/* 超大屏：固定 -20px 右边距 */
@media (min-width: 1921px) {
  .people-content, .alumni-content, .resources-content {
    margin-right: -20px;
  }
}

@media (max-width: 768px) {
  .alumni-row {
    grid-template-columns: 1fr;
    padding: 12px 0;
  }

  .alumni-row .name {
    font-size: 16px;
    margin-bottom: 2px;
  }

  .alumni-row .destination {
    font-size: 14px;
  }
}

@media (max-width: 560px) {
  .alumni-row {
    font-size: 14px;
  }

  .alumni-row .name {
    font-size: 15px;
  }

  .alumni-row .destination {
    font-size: 13px;
  }
}

/* ========== Position Detail Page Anchor Scroll ========== */
#phd, #master, #postdoc, #visiting, #engineer, #intern {
  scroll-margin-top: 80px;
}

/* ========== Highlight Grid 3-column Layout ========== */
.highlight-grid-3 {
  grid-template-columns: repeat(3, 1fr) !important;
  max-width: 100%;
}

@media (max-width: 968px) {
  .highlight-grid-3 {
    grid-template-columns: repeat(2, 1fr) !important;
  }
}

@media (max-width: 640px) {
  .highlight-grid-3 {
    grid-template-columns: 1fr !important;
  }
}

/* ========== Why Join Us Cards ========== */
.why-join-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  max-width: 1200px;
  margin: 0 auto;
}

.why-join-card {
  background-color: white;
  padding: 28px 24px;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  transition: all 0.3s ease;
  text-align: center;
  border: 1px solid var(--border);
}

.why-join-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 24px rgba(0, 87, 166, 0.15);
  border-color: var(--fudan-blue);
}

.why-join-icon {
  font-size: 40px;
  margin-bottom: 16px;
  line-height: 1;
  animation: float 3s ease-in-out infinite;
}

.why-join-card:nth-child(1) .why-join-icon { animation-delay: 0s; }
.why-join-card:nth-child(2) .why-join-icon { animation-delay: 0.5s; }
.why-join-card:nth-child(3) .why-join-icon { animation-delay: 1s; }
.why-join-card:nth-child(4) .why-join-icon { animation-delay: 1.5s; }
.why-join-card:nth-child(5) .why-join-icon { animation-delay: 2s; }
.why-join-card:nth-child(6) .why-join-icon { animation-delay: 2.5s; }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.why-join-card h4 {
  font-size: 18px;
  font-weight: 600;
  color: var(--charcoal);
  margin: 0 0 10px 0;
}

.why-join-card p {
  font-size: 14px;
  color: var(--text-soft);
  line-height: 1.6;
  margin: 0;
}

@media (max-width: 968px) {
  .why-join-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
}

@media (max-width: 640px) {
  .why-join-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .why-join-card {
    padding: 24px 20px;
  }
  
  .why-join-icon {
    font-size: 36px;
    margin-bottom: 14px;
  }
}