:root {
  /* SpaceX-inspired deep space palette */
  --space-black: #000000;
  --space-dark: #0a0a0a;
  --space-charcoal: #121212;
  --space-gray: #1c1c1c;
  --space-steel: #2a2a2a;

  --bg-primary: var(--space-black);
  --bg-secondary: var(--space-dark);
  --bg-card: rgba(255, 255, 255, 0.03);
  --text-primary: #ffffff;
  --text-secondary: #8a8f98;
  --accent: #ffffff;
  --accent-secondary: #a7a7a7;
  --accent-tertiary: #8a8f98;
  --border: rgba(255, 255, 255, 0.1);
  --border-strong: rgba(255, 255, 255, 0.2);
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-purple: 0 4px 24px rgba(0, 0, 0, 0.4);
  --gradient-hero: radial-gradient(ellipse at center, rgba(40, 40, 45, 0.4) 0%, transparent 60%),
                    linear-gradient(180deg, var(--space-black) 0%, var(--space-dark) 100%);
  --grid-color: rgba(255, 255, 255, 0.03);
}

[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f5;
  --bg-card: rgba(0, 0, 0, 0.03);
  --text-primary: #0a0a0a;
  --text-secondary: #5a5a5a;
  --accent: #0a0a0a;
  --accent-secondary: #3a3a3a;
  --accent-tertiary: #5a5a5a;
  --border: rgba(0, 0, 0, 0.1);
  --border-strong: rgba(0, 0, 0, 0.2);
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  --shadow-purple: 0 4px 24px rgba(0, 0, 0, 0.08);
  --gradient-hero: radial-gradient(ellipse at center, rgba(220, 220, 225, 0.4) 0%, transparent 60%),
                    linear-gradient(180deg, #ffffff 0%, #f5f5f5 100%);
  --grid-color: rgba(0, 0, 0, 0.03);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

html.theme-loading,
html.theme-loading * {
  transition: none !important;
}

/* Subtle starfield/grid background */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    radial-gradient(1px 1px at 20px 30px, rgba(255,255,255,0.15), transparent),
    radial-gradient(1px 1px at 40px 70px, rgba(255,255,255,0.1), transparent),
    radial-gradient(1px 1px at 90px 40px, rgba(255,255,255,0.12), transparent),
    radial-gradient(1px 1px at 130px 80px, rgba(255,255,255,0.08), transparent),
    radial-gradient(1px 1px at 160px 20px, rgba(255,255,255,0.1), transparent),
    radial-gradient(1px 1px at 200px 60px, rgba(255,255,255,0.12), transparent),
    radial-gradient(1px 1px at 250px 90px, rgba(255,255,255,0.08), transparent),
    radial-gradient(1px 1px at 300px 30px, rgba(255,255,255,0.1), transparent),
    radial-gradient(1px 1px at 340px 70px, rgba(255,255,255,0.12), transparent),
    radial-gradient(1px 1px at 380px 50px, rgba(255,255,255,0.08), transparent);
  background-size: 400px 120px;
  pointer-events: none;
  z-index: -2;
  opacity: 0.6;
}

a {
  color: var(--text-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: all 0.2s;
}

a:hover {
  color: var(--text-secondary);
}

/* Navigational / interactive links keep a cleaner look */
.navbar-brand,
.navbar-links a,
.btn,
.footer a,
.article-title,
.search-result-item a,
.toc-sidebar a,
.tag,
.back-to-top,
.lightbox-close {
  text-decoration: none;
}

.footer a {
  color: var(--text-secondary);
}

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

.article-title {
  color: var(--text-primary);
}

.article-title:hover {
  color: var(--text-secondary);
}

/* Ensure inline links in content pages (About, Publications, Mentoring, etc.) stand out */
.page-content p a,
.page-content li a,
.page-content td a,
.news-scrollbox a {
  color: var(--text-secondary);
  text-decoration: underline;
}

.page-content p a:hover,
.page-content li a:hover,
.page-content td a:hover,
.news-scrollbox a:hover {
  color: var(--text-primary);
}

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

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: all 0.4s ease;
}

.navbar.scrolled {
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  border-bottom-color: var(--border);
}

[data-theme="light"] .navbar.scrolled {
  background: rgba(255, 255, 255, 0.9);
}

.navbar-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.navbar-brand img {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border-strong);
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.navbar-links a {
  padding: 0.5rem 0.85rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  position: relative;
  transition: color 0.25s ease;
}

.navbar-links a:hover,
.navbar-links a.active {
  color: var(--text-secondary);
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.theme-toggle,
.mobile-menu-btn,
.search-toggle {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.theme-toggle:hover,
.mobile-menu-btn:hover,
.search-toggle:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--border-strong);
}

.mobile-menu-btn {
  display: none;
}

/* Hero Section */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--bg-primary);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient-hero);
  z-index: 0;
}

.hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  opacity: 0.4;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 1100px;
  padding: 0 1.5rem;
  width: 100%;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.55rem 1.1rem;
  border-radius: 9999px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 2rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
}

.hero-title {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: clamp(3rem, 10vw, 7.5rem);
  font-weight: 900;
  line-height: 0.95;
  margin-bottom: 1.75rem;
  text-transform: uppercase;
  letter-spacing: -2px;
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.35rem);
  color: var(--text-secondary);
  margin-bottom: 3rem;
  min-height: 3.5rem;
  font-weight: 400;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 1rem 2.25rem;
  border-radius: 0;
  font-weight: 700;
  font-size: 0.85rem;
  transition: all 0.3s ease;
  border: 1px solid transparent;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 1.5px;
}

.btn-primary {
  background: var(--text-primary);
  color: var(--bg-primary);
}

.btn-primary:hover {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--text-primary);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
}

.btn-secondary:hover {
  background: var(--text-primary);
  color: var(--bg-primary);
  border-color: var(--text-primary);
}

.hero-scroll {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  color: var(--text-secondary);
  animation: bounce 2.5s infinite;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-10px); }
  60% { transform: translateX(-50%) translateY(-5px); }
}

/* Section */
.section {
  padding: 6rem 1.5rem;
  max-width: 1400px;
  margin: 0 auto;
  position: relative;
}

.section-title {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  text-align: center;
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: -1px;
  color: var(--text-primary);
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  max-width: 750px;
  margin: 0 auto 3.5rem;
  font-size: 1.1rem;
  line-height: 1.7;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0;
  padding: 2rem;
  transition: all 0.35s ease;
  position: relative;
  overflow: hidden;
}

.card:hover {
  border-color: var(--border-strong);
  background: rgba(255, 255, 255, 0.05);
}

.card-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
}

.card h3 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 1.4rem;
  margin-bottom: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.5px;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.5rem;
  text-align: center;
}

.stat-card {
  padding: 2rem 1rem;
}

.stat-number {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 3.5rem;
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: -1px;
}

.stat-label {
  color: var(--text-secondary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-size: 0.85rem;
}

/* News */
.news-list {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0;
  padding: 1.5rem;
  max-height: 520px;
  overflow-y: auto;
}

.news-list ul {
  list-style: none;
}

.news-list li {
  padding: 0.875rem 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
  position: relative;
  padding-left: 1rem;
}

.news-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--text-secondary);
}

.news-list li:last-child {
  border-bottom: none;
}

.news-list strong {
  color: var(--text-primary);
}

.page-content .recent-news-list {
  list-style: none;
  padding: 0;
}

.recent-news-list li {
  padding: 0.875rem 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
  position: relative;
  padding-left: 1rem;
}

.recent-news-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--text-secondary);
}

.recent-news-list li:last-child {
  border-bottom: none;
}

.recent-news-list a {
  color: var(--text-secondary);
  text-decoration: underline;
}

.recent-news-list a:hover {
  color: var(--text-primary);
}

.news-scrollbox .recent-news-list li {
  padding-left: 1.2rem;
}

/* Publications preview */
.pub-card {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 1.5rem;
  align-items: start;
}

.pub-card img {
  border-radius: 12px;
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
}

.pub-title {
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.pub-authors {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.pub-venue {
  font-weight: 700;
  font-style: italic;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

/* Content pages */
.page-header {
  padding-top: 130px;
  padding-bottom: 3.5rem;
  text-align: center;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  position: relative;
}

.page-header h1 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -1px;
  color: var(--text-primary);
}

.page-content {
  max-width: 1100px;
  margin: 0 auto;
  padding: 7rem 1.5rem 5rem;
}

.page-content h2 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 2rem;
  margin-top: 2.75rem;
  margin-bottom: 1.1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
  display: inline-block;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.5px;
}

.page-content h3 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 1.5rem;
  margin-top: 2.25rem;
  margin-bottom: 0.9rem;
  color: var(--text-primary);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.5px;
}

.page-content h4 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 1.2rem;
  margin-top: 1.75rem;
  margin-bottom: 0.6rem;
  color: var(--text-secondary);
  font-weight: 700;
}

.page-content h5 {
  font-size: 1.05rem;
  margin-top: 1.5rem;
  margin-bottom: 0.6rem;
  color: var(--text-secondary);
  font-weight: 700;
}

.page-content p {
  margin-bottom: 1rem;
}

.page-content ul,
.page-content ol {
  margin-bottom: 1rem;
  padding-left: 1.75rem;
}

.page-content ul {
  list-style: disc;
}

.page-content ul ul {
  list-style: circle;
}

.page-content ul ul ul {
  list-style: square;
}

.page-content ol {
  list-style: decimal;
}

.page-content ol ol {
  list-style: lower-alpha;
}

.page-content li {
  margin-bottom: 0.5rem;
}

.page-content ul li::marker {
  color: var(--text-primary);
}

.page-content ul ul li::marker {
  color: var(--text-secondary);
}

.page-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
  overflow-x: auto;
  display: block;
  border: 1px solid var(--border);
}

.page-content th,
.page-content td {
  padding: 0.85rem;
  border: 1px solid var(--border);
  text-align: left;
}

.page-content th {
  background: var(--bg-secondary);
  font-weight: 700;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-size: 0.85rem;
}

.page-content tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.02);
}

.page-content img {
  border-radius: 0;
  margin: 1rem 0;
  border: 1px solid var(--border);
}

.page-content blockquote {
  border-left: 2px solid var(--text-primary);
  padding-left: 1.25rem;
  margin: 1.5rem 0;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.03);
  padding: 1rem 1rem 1rem 1.25rem;
}

.page-content code {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
  padding: 0.2rem 0.45rem;
  border-radius: 0;
  font-family: 'Fira Code', 'JetBrains Mono', monospace;
  font-size: 0.88em;
}

.page-content pre {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  padding: 1.25rem;
  overflow-x: auto;
  margin-bottom: 1.25rem;
  border: 1px solid var(--border);
}

.page-content pre code {
  background: transparent;
  padding: 0;
  border: none;
  color: var(--text-primary);
}

[data-theme="light"] .page-content code {
  background: rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .page-content pre {
  background: rgba(0, 0, 0, 0.04);
}

/* Article list */
.article-list {
  display: grid;
  gap: 1rem;
}

.article-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0;
  padding: 1.25rem;
  transition: all 0.25s;
}

.article-item:hover {
  border-color: var(--border-strong);
  background: rgba(255, 255, 255, 0.05);
}

.article-meta {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
  font-family: 'Fira Code', monospace;
}

.article-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
}

.article-title:hover {
  color: var(--text-secondary);
}

.article-excerpt {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

/* Footer */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 3.5rem 1.5rem;
  position: relative;
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2.5rem;
}

.footer h4 {
  margin-bottom: 1.25rem;
  color: var(--text-primary);
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.footer p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

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

.footer-bottom {
  max-width: 1400px;
  margin: 2.5rem auto 0;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  border-radius: 0;
  background: var(--text-primary);
  color: var(--bg-primary);
  border: 1px solid var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: transparent;
  color: var(--text-primary);
}

/* Animations */
.fade-in {
  opacity: 0;
  transform: translateY(25px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Mobile menu */
@media (max-width: 1024px) {
  .navbar-links {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.98);
    flex-direction: column;
    align-items: stretch;
    padding: 1rem;
    gap: 0.25rem;
    border-bottom: 1px solid var(--border);
    transform: translateY(-150%);
    transition: transform 0.3s ease;
    max-height: calc(100vh - 72px);
    overflow-y: auto;
  }

  [data-theme="light"] .navbar-links {
    background: rgba(255, 255, 255, 0.98);
  }

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

  .navbar-links a {
    padding: 0.875rem 1rem;
  }

  .mobile-menu-btn {
    display: flex;
  }
}

@media (max-width: 640px) {
  .pub-card {
    grid-template-columns: 1fr;
  }

  .pub-card img {
    max-width: 200px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .section {
    padding: 3.5rem 1rem;
  }
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 0;
}

/* Futuristic glow text utility */
.glow-text {
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.2), 0 0 20px rgba(255, 255, 255, 0.1);
}

.glow-border {
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.08);
}

/* Sidebar TOC */
.toc-layout {
  transition: grid-template-columns 0.35s ease;
}

.toc-layout.collapsed {
  grid-template-columns: 56px 1fr;
}

.toc-sidebar {
  position: sticky;
  top: 100px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0;
  padding: 1.25rem;
  transition: all 0.35s ease;
}

.toc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.toc-sidebar.collapsed .toc-header {
  justify-content: center;
  margin-bottom: 0;
}

.toc-sidebar.collapsed h4 {
  display: none;
}

.toc-sidebar.collapsed ul {
  display: none;
}

.toc-sidebar h4 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-size: 0.9rem;
}

.toc-toggle {
  width: 32px;
  height: 32px;
  border-radius: 0;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
  flex-shrink: 0;
}

.toc-toggle:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--border-strong);
}

.toc-chevron {
  transition: transform 0.35s ease;
}

.toc-sidebar.collapsed .toc-chevron {
  transform: rotate(180deg);
}

.page-content .toc-sidebar ul {
  list-style: none;
  padding: 0;
}

.toc-sidebar li {
  margin-bottom: 0.35rem;
}

.toc-sidebar a {
  display: block;
  padding: 0.4rem 0.6rem;
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.88rem;
  transition: all 0.2s;
}

.toc-sidebar a:hover,
.toc-sidebar a.active {
  color: var(--text-primary);
}

.page-content .toc-sidebar ul ul {
  padding-left: 0.75rem;
  margin-top: 0.25rem;
}

.page-content .toc-sidebar ul ul:empty {
  display: none;
}

.toc-sidebar a.toc-level-3 {
  font-size: 0.85rem;
}

.toc-sidebar a.toc-level-4 {
  font-size: 0.82rem;
}

/* Search overlay */
.search-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.95);
  backdrop-filter: blur(10px);
  z-index: 2000;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding-top: 10vh;
}

.search-overlay.open {
  display: flex;
}

.search-container {
  width: 90%;
  max-width: 700px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0;
  overflow: hidden;
}

.search-input-wrap {
  display: flex;
  align-items: center;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

.search-input-wrap svg {
  color: var(--text-secondary);
  margin-right: 1rem;
}

.search-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 1.2rem;
  outline: none;
  font-family: inherit;
}

.search-input::placeholder {
  color: var(--text-secondary);
}

.search-close {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.5rem;
}

.search-results {
  max-height: 60vh;
  overflow-y: auto;
  padding: 1rem 0;
}

.search-result-item {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.15s;
}

.search-result-item:hover {
  background: rgba(255, 255, 255, 0.05);
}

.search-result-item a {
  color: var(--text-primary);
  display: block;
}

.search-result-item .search-result-title {
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.search-result-item .search-result-excerpt {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.search-empty {
  padding: 2rem;
  text-align: center;
  color: var(--text-secondary);
}

/* Tags */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.8rem;
  border-radius: 0;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-size: 0.75rem;
  font-weight: 600;
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
}

/* Publications page */
.page-content ol {
  padding-left: 2rem;
}

.page-content ol > li {
  margin-bottom: 1.75rem;
  padding-left: 0.5rem;
}

.page-content ol > li::marker {
  color: var(--text-primary);
  font-weight: 800;
  font-family: 'Space Grotesk', sans-serif;
}

/* Continuous numbering across all lists on the publications page */
.publications-page .page-content {
  counter-reset: pub-counter;
}

.publications-page .page-content ol {
  list-style: none;
}

.publications-page .page-content ol > li {
  counter-increment: pub-counter;
  position: relative;
}

.publications-page .page-content ol > li::before {
  content: counter(pub-counter) ".";
  position: absolute;
  left: -2rem;
  width: 1.75rem;
  text-align: right;
  color: var(--text-primary);
  font-weight: 800;
  font-family: 'Space Grotesk', sans-serif;
}

.pub-entry-title {
  font-size: 1.1rem;
  color: var(--text-primary);
  line-height: 1.4;
  display: inline-block;
  margin-bottom: 0.4rem;
  font-weight: 800;
}

.page-content li p {
  margin-bottom: 0.5rem;
}

/* Lightbox */
.lightbox {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  z-index: 3000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  cursor: zoom-out;
}

.lightbox.open {
  display: flex;
}

.lightbox img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: 0;
  border: 1px solid rgba(0, 0, 0, 0.1);
  cursor: default;
}

.lightbox-close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  width: 44px;
  height: 44px;
  border-radius: 0;
  background: transparent;
  border: 1px solid rgba(0, 0, 0, 0.2);
  color: #0a0a0a;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
}

.lightbox-close:hover {
  background: rgba(0, 0, 0, 0.05);
}

/* Zoom cursor for clickable images */
img[data-lightbox],
.pub-card img,
.gallery-item img {
  cursor: zoom-in;
}

/* Gallery grid */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.gallery-item {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: all 0.35s ease;
  cursor: zoom-in;
}

.gallery-item:hover {
  border-color: var(--border-strong);
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.gallery-item:hover img {
  transform: scale(1.05);
}