/* ============================================================
   NAVIGATION
   ============================================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0.75rem 0;
  background: transparent;
  transition: background var(--transition-base), border-color var(--transition-base);
  border-bottom: 1px solid transparent;
}

.navbar.scrolled {
  background: var(--color-nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: var(--color-nav-border);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  display: flex;
  align-items: center;
}

.nav-logo-img {
  height: 22px;
  width: auto;
  transition: opacity var(--transition-fast), filter var(--transition-base);
  filter: invert(1);
}

.navbar.scrolled .nav-logo-img {
  filter: none;
}

.nav-logo:hover .nav-logo-img {
  opacity: 0.7;
}

[data-theme="dark"] .nav-logo-img {
  filter: invert(1);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav-links a {
  color: rgba(255, 255, 255, 0.6);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav-links a:hover {
  color: #ffffff;
}

.navbar.scrolled .nav-links a {
  color: var(--color-text-secondary);
}

.navbar.scrolled .nav-links a:hover {
  color: var(--color-text-primary);
}

.nav-cv {
  background: rgba(255, 255, 255, 0.15);
  color: #fff !important;
  padding: 5px 14px;
  border-radius: var(--border-radius-pill);
  font-weight: 600;
  font-size: var(--text-xs) !important;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: all var(--transition-base);
}

.navbar.scrolled .nav-cv {
  background: var(--color-text-primary);
}

.nav-cv:hover {
  background: var(--color-accent-1);
  color: #fff !important;
}

.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
  color: rgba(255, 255, 255, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: color var(--transition-fast);
}

.theme-toggle:hover {
  color: #ffffff;
}

.navbar.scrolled .theme-toggle {
  color: var(--color-text-secondary);
}

.navbar.scrolled .theme-toggle:hover {
  color: var(--color-text-primary);
}

/* Show/hide sun/moon icons */
.icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(160deg, #000000 0%, #091525 30%, #0d1f3c 60%, #0a1628 100%);
  padding: 8rem 0 7rem;
}

.hero-content {
  position: relative;
  text-align: center;
  padding: var(--space-xl);
  max-width: 800px;
}

.hero-content--split {
  max-width: var(--max-width);
  display: flex;
  align-items: center;
  gap: var(--space-3xl);
  text-align: left;
}

.hero-photo {
  flex-shrink: 0;
}

.hero-headshot {
  width: 240px;
  height: 240px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid rgba(255, 255, 255, 0.1);
}

.hero-text {
  flex: 1;
  min-width: 0;
}

.hero-name {
  font-size: var(--text-4xl);
  font-weight: 700;
  color: #ffffff;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-sm);
  background: linear-gradient(135deg, #ffffff 0%, var(--color-accent-1) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-affiliation {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 2px;
}

.hero-affiliation-sub {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.4);
  margin-bottom: var(--space-lg);
}

.hero-cv-btn {
  display: inline-block;
  background: transparent;
  color: rgba(255, 255, 255, 0.7);
  padding: 7px 22px;
  border-radius: var(--border-radius-pill);
  border: 1px solid rgba(255, 255, 255, 0.2);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.03em;
  margin-bottom: var(--space-lg);
  transition: all var(--transition-base);
}

.hero-cv-btn:hover {
  background: #fff;
  color: #000;
  border-color: #fff;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-lg);
}

.hero-content--split .hero-links {
  justify-content: flex-start;
}

.social-link {
  color: rgba(255, 255, 255, 0.4);
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: var(--text-sm);
  font-weight: 400;
  transition: color var(--transition-fast);
}

.social-link svg {
  flex-shrink: 0;
}

.social-link:hover {
  color: #fff;
}

/* ============================================================
   SECTIONS (shared)
   ============================================================ */
.section {
  padding: var(--space-section) 0;
  background: var(--color-bg-section);
  border-top: 2px solid var(--color-accent-1);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.section-title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-xl);
  color: var(--color-text-primary);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.section-title--light {
  color: var(--color-text-on-dark);
}

/* ============================================================
   ABOUT
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: var(--space-2xl);
  align-items: start;
}

.about-photo {
  position: relative;
}

.headshot {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
}

.about-text p {
  margin-bottom: var(--space-md);
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.75;
}

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

/* ============================================================
   RESEARCH HIGHLIGHT
   ============================================================ */
.highlight-feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: start;
}

.highlight-feature-img-link {
  display: block;
  border-radius: var(--border-radius);
  overflow: hidden;
  border: 1px solid var(--color-card-border);
  background: #f5f5f5;
  padding: var(--space-sm);
  transition: box-shadow var(--transition-base);
}

.highlight-feature-img-link:hover {
  box-shadow: var(--shadow-lg);
}

[data-theme="dark"] .highlight-feature-img-link {
  background: #1a1a1a;
}

.highlight-feature-img {
  width: 100%;
  height: auto;
  border-radius: var(--border-radius-sm);
}

.highlight-feature-text h3 {
  font-size: var(--text-base);
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: var(--space-sm);
}

.highlight-feature-text h3 a {
  color: var(--color-text-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.highlight-feature-text h3 a:hover {
  color: var(--color-accent-1);
}

.highlight-feature-text p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-lg);
}

.highlight-press {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs) var(--space-md);
}

.highlight-press-label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.highlight-press a {
  font-size: var(--text-sm);
  color: var(--color-accent-1);
  transition: color var(--transition-fast);
}

.highlight-press a:hover {
  color: #0088bb;
}

@media (max-width: 768px) {
  .highlight-feature {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

/* ============================================================
   PUBLICATION LIST (unified for all research sections)
   ============================================================ */
.pub-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.pub-item {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-card-border);
  padding-left: var(--space-md);
  padding-right: var(--space-md);
  margin-left: calc(-1 * var(--space-md));
  margin-right: calc(-1 * var(--space-md));
  border-radius: var(--border-radius-sm);
  transition: background var(--transition-fast);
}

.pub-item:hover {
  background: var(--color-accent-1-light);
}

.pub-item:first-child {
  padding-top: 0;
}

.pub-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.pub-badge {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent-1);
  margin-bottom: 4px;
}

.pub-title {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text-primary);
  line-height: 1.5;
  margin-bottom: 2px;
}

.pub-authors {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: 4px;
  line-height: 1.6;
}

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

.pub-authors a {
  color: var(--color-text-secondary);
  text-decoration: underline;
  text-decoration-color: rgba(102, 102, 102, 0.3);
  text-underline-offset: 2px;
}

.pub-authors a:hover {
  color: var(--color-accent-1);
  text-decoration-color: var(--color-accent-1);
}

.pub-link {
  font-size: var(--text-sm);
  color: var(--color-accent-1);
}

.pub-link--muted {
  color: var(--color-text-secondary);
  font-style: italic;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  padding: var(--space-3xl) 0 var(--space-xl);
  background: linear-gradient(160deg, #0d1117 0%, #0a1628 50%, #000000 100%);
  text-align: center;
  border-top: 2px solid var(--color-accent-1);
}

.footer-email {
  margin-bottom: var(--space-lg);
}

.footer-email a {
  font-size: var(--text-lg);
  font-family: var(--font-heading);
  color: #ffffff;
  font-weight: 400;
  transition: color var(--transition-base);
}

.footer-email a:hover {
  color: var(--color-accent-1);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md) var(--space-xl);
  margin-bottom: var(--space-2xl);
}

.footer-links a {
  color: rgba(255, 255, 255, 0.35);
  font-size: var(--text-sm);
  transition: color var(--transition-fast);
}

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

.footer-copy {
  font-size: var(--text-xs);
  color: rgba(255, 255, 255, 0.2);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
  :root {
    --space-section: 3rem;
  }

  .nav-links a:not(:last-of-type) {
    display: none;
  }

  .hero {
    padding: 4rem 0 3rem;
  }

  .hero-name {
    font-size: var(--text-3xl);
  }

  .hero-content--split {
    flex-direction: column;
    text-align: center;
    gap: var(--space-xl);
  }

  .hero-headshot {
    width: 160px;
    height: 160px;
  }

  .hero-content--split .hero-links {
    justify-content: center;
  }

  .hero-links {
    gap: var(--space-xs) var(--space-md);
    justify-content: center;
  }

  .about-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-lg);
  }

  .about-photo {
    display: flex;
    justify-content: center;
  }

  .headshot {
    width: 150px;
    height: 150px;
  }
}

@media (max-width: 480px) {
  :root {
    --space-section: 2.5rem;
  }

  .hero-name {
    font-size: var(--text-2xl);
  }

  .container {
    padding: 0 var(--space-md);
  }

  .hero-content {
    padding: var(--space-md);
  }

  .hero-headshot {
    width: 140px;
    height: 140px;
  }
}