/* ===== RESET & BASE ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-primary: #c8102e;
  --color-primary-dark: #a00d24;
  --color-dark: #1a1a2e;
  --color-text: #2d2d3a;
  --color-text-light: #5a5a6e;
  --color-bg: #fafaf8;
  --color-bg-alt: #f7f7fb;
  --color-bg-warm: #faf9f7;
  --color-border: #e8e8f0;
  --color-accent: #0d47a1;
  --font-heading: 'Source Serif 4', 'Georgia', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --max-width: 1200px;
  --nav-height: 64px;
  --transition: 0.25s ease;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 20px);
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-primary);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-dark);
  line-height: 1.3;
  font-weight: 600;
}

/* ===== UTILITY ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-header {
  margin-bottom: 48px;
}

.section-header h2 {
  font-size: 2rem;
  margin-bottom: 12px;
  position: relative;
  display: inline-block;
}

.section-header h2::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 48px;
  height: 3px;
  background: var(--color-primary);
  border-radius: 2px;
}

.section-header p {
  color: var(--color-text-light);
  font-size: 1.05rem;
  max-width: 720px;
}

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

/* ===== NAVIGATION ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: box-shadow var(--transition);
}

.navbar.scrolled {
  box-shadow: 0 2px 20px rgba(0,0,0,0.06);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--color-dark);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
}

.nav-brand span {
  color: var(--color-primary);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 4px;
}

.nav-links a {
  display: block;
  padding: 8px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-light);
  text-decoration: none;
  border-radius: 6px;
  transition: all var(--transition);
  letter-spacing: 0.01em;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 16px;
  right: 16px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.3s ease;
}

.nav-links a:hover {
  color: var(--color-dark);
}

.nav-links a:hover::after {
  transform: scaleX(1);
}

.nav-links a.active {
  color: var(--color-primary);
}

.nav-links a.active::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--color-dark);
}

.nav-toggle svg {
  width: 24px;
  height: 24px;
}

/* ===== HERO ===== */
.hero {
  margin-top: var(--nav-height);
  padding: 100px 0 80px;
  background: linear-gradient(135deg, #fafafa 0%, #f0f0f8 50%, #eef2f7 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(200,16,46,0.04) 0%, transparent 70%);
  pointer-events: none;
}

.hero .container {
  position: relative;
}

.hero-content {
  max-width: 760px;
}

.hero-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-primary);
  margin-bottom: 16px;
  padding: 4px 12px;
  background: rgba(200,16,46,0.08);
  border-radius: 4px;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 24px;
  color: var(--color-dark);
}

.hero p {
  font-size: 1.2rem;
  line-height: 1.7;
  color: var(--color-text-light);
  margin-bottom: 32px;
  max-width: 640px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 8px;
  text-decoration: none;
  transition: all var(--transition);
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(200,16,46,0.3);
}

.btn-outline {
  border: 1.5px solid var(--color-border);
  color: var(--color-text);
  background: #fff;
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-1px);
}

/* ===== RESEARCH HIGHLIGHTS (homepage) ===== */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.research-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 32px 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.research-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.research-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.06);
  border-color: transparent;
}

.research-card:hover::before {
  transform: scaleX(1);
}

.research-card-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.5rem;
}

.research-card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.research-card p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ===== VORONOI HERO ===== */
.voronoi-hero {
  margin-top: var(--nav-height);
  position: relative;
  min-height: 600px;
  background: var(--color-bg);
  overflow: hidden;
}

.voronoi-hero canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.voronoi-hero-overlay {
  position: relative;
  z-index: 1;
  padding: 100px 0 80px;
}

.voronoi-hero-overlay .hero-content {
  max-width: 620px;
}

/* ===== ANNOUNCEMENT ===== */
.announcement {
  background: linear-gradient(135deg, var(--color-dark) 0%, #2a2a4a 100%);
  color: #fff;
  border-radius: 16px;
  padding: 40px;
  display: flex;
  gap: 32px;
  align-items: center;
}

.announcement-badge {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  border-radius: 12px;
  background: rgba(200,16,46,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.announcement-content h3 {
  color: #fff;
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.announcement-content p {
  color: rgba(255,255,255,0.75);
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.announcement-content a {
  color: #fff;
  font-weight: 600;
  border-bottom: 1px solid rgba(255,255,255,0.4);
  transition: border-color var(--transition);
}

.announcement-content a:hover {
  border-color: #fff;
  color: #fff;
}

/* ===== PEOPLE ===== */
.people-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.person-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 28px;
  transition: all var(--transition);
  overflow: hidden;
}

.person-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
  border-color: rgba(200,16,46,0.2);
}

.person-card .person-meta {
  opacity: 0.7;
  transition: opacity var(--transition);
}

.person-card:hover .person-meta {
  opacity: 1;
}

.person-card-header {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 16px;
}

/* Member cards: larger rectangular photos */
.member-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 20px;
  align-items: start;
}

.member-card .member-photo {
  width: 105px;
  height: 128px;
  border-radius: 10px;
  overflow: hidden;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--color-bg-alt), #e8e8f0);
}

.member-card .member-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.member-card > div {
  min-width: 0;
  overflow-wrap: break-word;
  word-break: break-word;
}

.member-card .person-info {
  margin-bottom: 8px;
}

.member-card .person-meta {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  opacity: 0.7;
  transition: opacity var(--transition);
}

.member-card:hover .person-meta {
  opacity: 1;
}

.person-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-bg-alt), #e8e8f0);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-family: var(--font-heading);
  color: var(--color-primary);
  font-weight: 600;
  flex-shrink: 0;
  overflow: hidden;
}

.person-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.person-info h3 {
  font-size: 1.05rem;
  margin-bottom: 2px;
}

.person-role {
  font-size: 0.85rem;
  color: var(--color-primary);
  font-weight: 500;
}

.person-card p {
  font-size: 0.88rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

.person-card .person-meta {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.person-meta a {
  font-size: 0.82rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* PI Card (wider) */
.person-card.pi-card {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 32px;
  padding: 36px;
}

.pi-card .person-avatar {
  width: 140px;
  height: 170px;
  border-radius: 10px;
  font-size: 2.5rem;
  position: relative;
  z-index: 1;
  background: #fff;
  box-shadow: 0 0 0 4px #fff;
}

.pi-card .person-info h3 {
  font-size: 1.4rem;
}

.pi-card .person-role {
  font-size: 0.95rem;
}

.pi-card .person-bio {
  margin-top: 8px;
}

/* Alumni section */
.alumni-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}

.alumni-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 20px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  transition: all var(--transition);
}

.alumni-item:hover {
  border-color: var(--color-primary);
  background: rgba(200,16,46,0.02);
}

.alumni-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-bg-alt), #e8e8f0);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-family: var(--font-heading);
  color: var(--color-primary);
  font-weight: 600;
  flex-shrink: 0;
  overflow: hidden;
}

.alumni-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.alumni-bullet {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
  flex-shrink: 0;
  margin-top: 8px;
}

.alumni-item h4 {
  font-size: 0.95rem;
  font-family: var(--font-body);
  font-weight: 600;
  margin-bottom: 2px;
}

.alumni-item p {
  font-size: 0.84rem;
  color: var(--color-text-light);
  line-height: 1.5;
}

/* ===== PUBLICATIONS ===== */
.pub-year-group {
  margin-bottom: 48px;
}

.pub-year-group:last-child {
  margin-bottom: 0;
}

.pub-year {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 20px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-border);
}

.pub-list {
  list-style: none;
}

.pub-counter-scope {
  counter-reset: pub-num 58;
}

.pub-item {
  padding: 16px 0;
  padding-left: 44px;
  position: relative;
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition);
  counter-increment: pub-num -1;
}

.pub-item::before {
  content: counter(pub-num) ".";
  position: absolute;
  left: 0;
  top: 16px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-text-light);
  min-width: 36px;
}

.pub-item:last-child {
  border-bottom: none;
}

.pub-item:hover {
  background: var(--color-bg-alt);
  margin: 0 -12px;
  padding: 16px 12px 16px 56px;
  border-radius: 8px;
}

.pub-item:hover::before {
  left: 12px;
}

.pub-title {
  font-weight: 600;
  color: var(--color-dark);
  font-size: 1.05rem;
  margin-bottom: 4px;
  line-height: 1.5;
}

.pub-authors {
  font-size: 0.88rem;
  color: var(--color-text-light);
  margin-bottom: 4px;
}

.pub-authors strong {
  color: var(--color-text);
}

.pub-venue {
  font-size: 0.85rem;
  color: var(--color-text-light);
  font-style: italic;
  display: inline;
}

.pub-links {
  display: inline;
  margin-left: 8px;
}

.pub-venue-line {
  margin-top: 2px;
}

.pub-links a {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 3px 8px;
  border-radius: 4px;
  background: var(--color-bg-alt);
  color: var(--color-accent);
  transition: all var(--transition);
}

.pub-links a:hover {
  background: var(--color-accent);
  color: #fff;
}

.pub-scholar-link {
  text-align: center;
  margin-top: 40px;
}

/* ===== RESEARCH HERO (3D epidermis background) ===== */
.research-hero {
  margin-top: var(--nav-height);
  position: relative;
  min-height: 480px;
  background: var(--color-bg-alt);
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
}

.research-hero #epidermis-canvas {
  position: absolute;
  top: 0;
  right: 0;
  width: 55%;
  height: 100%;
}

.research-hero #epidermis-canvas canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.research-hero-overlay {
  position: relative;
  z-index: 1;
  padding: 60px 0 48px;
}

.research-hero-overlay h1 {
  font-size: 2.4rem;
  margin-bottom: 16px;
  color: var(--color-dark);
}

.research-hero-overlay p {
  color: var(--color-text);
  font-size: 0.95rem;
  line-height: 1.8;
  max-width: 540px;
}

@media (max-width: 900px) {
  .research-hero #epidermis-canvas {
    width: 100%;
    opacity: 0.2;
  }

  .research-hero-overlay p {
    max-width: 100%;
  }
}

/* ===== RESEARCH PAGE ===== */
.research-detail {
  margin-bottom: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--color-border);
}

.research-detail:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.research-detail h3 {
  font-size: 1.4rem;
  margin-bottom: 20px;
  color: var(--color-dark);
  position: relative;
  display: inline-block;
  padding-bottom: 8px;
}

.research-detail h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 2.5px;
  background: var(--color-primary);
  border-radius: 2px;
}

.research-detail p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text);
  max-width: 800px;
}

.research-overview {
  font-size: 1.15rem;
  line-height: 1.8;
  color: var(--color-text);
  max-width: 800px;
  margin-bottom: 48px;
}

/* ===== RESEARCH ROW (text + carousel side by side) ===== */
.research-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

/* Alternate layout: even sections flip carousel to left */
.research-detail:nth-child(even) .research-row {
  direction: rtl;
}

.research-detail:nth-child(even) .research-row > * {
  direction: ltr;
}

.research-row .carousel {
  max-width: none;
}

.research-text p {
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--color-text-light);
}

a.research-more {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-primary);
  transition: color var(--transition);
}

a.research-more:hover {
  color: var(--color-primary-dark);
}

@media (max-width: 900px) {
  .research-row {
    grid-template-columns: 1fr;
  }

  .research-detail:nth-child(even) .research-row {
    direction: ltr;
  }
}

/* ===== CAROUSEL ===== */
.carousel {
  position: relative;
  max-width: 800px;
  border-radius: 10px;
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--color-border);
}

.carousel-track {
  display: flex;
  transition: transform 0.5s ease;
}

.carousel-slide {
  flex: 0 0 100%;
  min-width: 0;
}

.carousel-slide img {
  width: 100%;
  height: 380px;
  object-fit: contain;
  display: block;
  background: #fafafa;
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background: rgba(26, 26, 46, 0.5);
  color: #fff;
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease;
  z-index: 2;
  opacity: 0;
  transition: opacity 0.25s ease, background 0.2s ease;
}

.carousel:hover .carousel-btn {
  opacity: 1;
}

.carousel-btn:hover {
  background: rgba(26, 26, 46, 0.75);
}

.carousel-btn--prev {
  left: 12px;
}

.carousel-btn--next {
  right: 12px;
}

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 10px 0;
  background: #fff;
  border-top: 1px solid var(--color-border);
}

.carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: none;
  background: var(--color-border);
  cursor: pointer;
  padding: 0;
  transition: background 0.25s ease, transform 0.25s ease;
}

.carousel-dot.active {
  background: var(--color-primary);
  transform: scale(1.25);
}

@media (max-width: 768px) {
  .carousel-slide img {
    height: 280px;
  }
}

@media (max-width: 480px) {
  .carousel-slide img {
    height: 200px;
  }

  .carousel-btn {
    width: 32px;
    height: 32px;
    font-size: 1rem;
  }
}

/* ===== CONTACT ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.contact-block {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 32px;
}

.contact-block h3 {
  font-size: 1.15rem;
  margin-bottom: 16px;
}

.contact-block p,
.contact-block li {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

.contact-block ul {
  list-style: none;
}

.contact-block li {
  padding: 6px 0;
}

.contact-block li a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

/* ===== FUNDING ===== */
.funding-bar {
  padding: 40px 0;
  background: var(--color-bg-warm);
  border-top: 1px solid var(--color-border);
}

.funding-bar .container {
  text-align: center;
}

.funding-bar p {
  font-size: 1.0625rem;
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  margin-bottom: 20px;
}

.funding-logos {
  display: flex;
  justify-content: center;
  align-items: center;
}

.funding-logos img {
  max-height: 240px;
  width: auto;
  opacity: 0.85;
}

/* ===== FOOTER ===== */
.footer {
  background: var(--color-dark);
  color: rgba(255,255,255,0.7);
  padding: 48px 0 32px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 32px;
  margin-bottom: 32px;
}

.footer-brand h3 {
  color: #fff;
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.footer-brand p {
  font-size: 0.88rem;
  line-height: 1.6;
  max-width: 360px;
}

.footer-links {
  display: flex;
  gap: 40px;
}

.footer-links-col h4 {
  color: #fff;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
  font-family: var(--font-body);
  font-weight: 600;
}

.footer-links-col ul {
  list-style: none;
}

.footer-links-col li {
  margin-bottom: 6px;
}

.footer-links-col a {
  color: rgba(255,255,255,0.6);
  font-size: 0.88rem;
  transition: color var(--transition);
}

.footer-links-col a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  font-size: 0.82rem;
  text-align: center;
  color: rgba(255,255,255,0.4);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.footer-bottom img {
  height: 40px;
  width: auto;
  opacity: 0.7;
}

/* ===== PAGE HEADER (inner pages) ===== */
.page-header {
  margin-top: var(--nav-height);
  padding: 60px 0 48px;
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
  font-size: 2.4rem;
  margin-bottom: 8px;
}

.page-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.page-header-row h1 {
  margin-bottom: 0;
}

.page-header p {
  color: var(--color-text-light);
  font-size: 1.05rem;
  max-width: 640px;
}

/* ===== BACK TO TOP ===== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-dark);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: all 0.3s ease;
  z-index: 100;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(200,16,46,0.3);
}

.back-to-top svg {
  width: 20px;
  height: 20px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .hero h1 {
    font-size: 2.2rem;
  }

  .hero p {
    font-size: 1.05rem;
  }

  .section {
    padding: 60px 0;
  }

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

  .person-card.pi-card {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .pi-card .person-avatar {
    margin: 0 auto;
  }

  .footer-content {
    flex-direction: column;
  }

  .announcement {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 16px 24px;
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
    gap: 0;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: 12px 0;
    font-size: 1rem;
  }

  .nav-toggle {
    display: block;
  }

  .hero {
    padding: 60px 0;
  }

  .hero h1 {
    font-size: 1.9rem;
  }

  .section-header h2 {
    font-size: 1.6rem;
  }

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

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

  .pub-year {
    font-size: 1.4rem;
  }
}

@media (max-width: 520px) {
  .member-card {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
  }

  .member-card .person-meta {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.6rem;
  }

  .container {
    padding: 0 16px;
  }

  .research-card {
    padding: 24px 20px;
  }

  .footer-links {
    flex-direction: column;
    gap: 24px;
  }
}

/* ===== RESEARCH HIGHLIGHT ===== */
.highlight {
  margin-bottom: 64px;
  padding-bottom: 64px;
  border-bottom: 1px solid var(--color-border);
}

.highlight:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.highlight-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  margin-bottom: 12px;
  padding: 4px 10px;
  background: rgba(200, 16, 46, 0.07);
  border-radius: 4px;
  display: inline-block;
}

.highlight-title {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.3;
  margin-bottom: 8px;
  max-width: 720px;
}

.highlight-collab {
  font-size: 0.88rem;
  color: var(--color-text-light);
  font-style: italic;
  margin-bottom: 40px;
}

.highlight-figure {
  margin: 0 auto 48px;
  text-align: center;
}

.highlight-figure img {
  max-width: 680px;
  width: 100%;
  border-radius: 10px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
}

.highlight-figure figcaption {
  margin-top: 12px;
  font-size: 0.82rem;
  color: var(--color-text-light);
  font-style: italic;
}

.highlight-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
  margin-bottom: 40px;
}

.highlight-text p {
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--color-text);
  margin-bottom: 16px;
}

.highlight-text p:last-child {
  margin-bottom: 0;
}

.highlight-text strong {
  color: var(--color-dark);
}

.highlight-video {
  position: sticky;
  top: calc(var(--nav-height) + 24px);
}

.highlight-video iframe {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 0;
  border-radius: 10px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
  display: block;
}

.highlight-caption {
  margin-top: 10px;
  font-size: 0.8rem;
  color: var(--color-text-light);
  font-style: italic;
  text-align: center;
}

.highlight-cite {
  padding: 20px 24px;
  background: var(--color-bg-alt);
  border-radius: 10px;
  border-left: 3px solid var(--color-primary);
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--color-text-light);
  max-width: 720px;
}

.highlight-cite em {
  color: var(--color-text);
}

.highlight-cite a {
  font-weight: 600;
  margin-left: 4px;
}

@media (max-width: 900px) {
  .highlight-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .highlight-title {
    font-size: 1.4rem;
  }

  .highlight-video {
    position: static;
  }
}