:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #0d0d14;
  --bg-glass: rgba(30, 30, 42, 0.6);
  --border-glass: rgba(255, 255, 255, 0.08);
  --text-primary: #f0f0f5;
  --text-secondary: #a0a0b0;
  --text-muted: #707080;
  --accent-turquoise: #2dd4bf;
  --accent-purple: #c084fc;
  --accent-glow: rgba(45, 212, 191, 0.15);
  
  --font-sans: 'Optima', 'Optima Nova', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-display: 'Avenir', 'Avenir Next', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  background-image: 
    radial-gradient(circle at 15% 50%, rgba(45, 212, 191, 0.04) 0%, transparent 50%),
    radial-gradient(circle at 85% 30%, rgba(192, 132, 252, 0.04) 0%, transparent 50%);
  background-attachment: fixed;
}

/* TOP NAVIGATION */
.top-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 70px;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-glass);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-container {
  max-width: 1440px;
  width: 100%;
  display: flex;
  justify-content: flex-end; /* Aligns links to right */
  padding: 0 4rem;
}

.mobile-brand {
  display: none;
  font-family: var(--font-display);
  font-weight: 700;
  color: #fff;
}

.nav-menu {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  padding: 0.5rem 0;
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
  font-weight: 500;
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-link.active {
  color: var(--accent-turquoise);
  border-bottom-color: var(--accent-turquoise);
}

/* MAIN LAYOUT */
.layout-container {
  display: flex;
  min-height: 100vh;
  max-width: 1440px;
  margin: 0 auto;
  padding-top: 70px; /* offset for fixed header */
}

/* SIDEBAR - Profile */
.sidebar {
  width: 340px;
  flex-shrink: 0;
  padding: 3rem 2.5rem;
  border-right: 1px solid var(--border-glass);
  background: var(--bg-secondary);
}

.sidebar-inner {
  position: sticky;
  top: calc(70px + 3rem); /* offset for header + padding */
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 2.5rem;
}

.profile-photo {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border-glass);
  background: var(--bg-glass);
  margin-bottom: 1.5rem;
  box-shadow: 0 8px 30px rgba(0,0,0,0.5);
}

.logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 2.2rem;
  line-height: 1.1;
  background: linear-gradient(135deg, #fff 0%, #a0a0b0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -1px;
}

.title {
  color: var(--accent-turquoise);
  font-weight: 500;
  font-size: 1rem;
  margin-top: 0.25rem;
}

.affiliation {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.icon-stack {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  padding-top: 1.25rem;
}

.social-icon {
  color: var(--text-secondary);
  width: 36px;
  height: 36px;
  transition: color 0.2s ease, transform 0.2s ease;
}

.social-icon:hover {
  color: var(--accent-purple);
  transform: translateY(-2px);
}

/* MAIN CONTENT AREA */
.main-content {
  flex-grow: 1;
  padding: 0 4rem;
  max-width: 900px;
}

.section {
  padding: 6rem 0;
  border-bottom: 1px solid var(--border-glass);
  scroll-margin-top: 70px; /* So hash # jumps offset the header */
}

.section:last-of-type, .site-footer {
  border-bottom: none;
}

.section-title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: #fff;
}

.section-subtitle {
  color: var(--text-secondary);
  margin-top: -1rem;
  margin-bottom: 2rem;
  font-size: 1rem;
}

.flex-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}

/* Details overrides */
.hero {
  padding-top: 4rem;
  min-height: auto;
}

.hero-greeting {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 1rem;
  color: #fff;
  letter-spacing: -1px;
}

.hero-lead {
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--accent-turquoise);
  margin-bottom: 1.5rem;
  line-height: 1.4;
}

.hero-bio {
  font-size: 1.05rem;
  color: var(--text-secondary);
}

/* Tags Container */
.tags-container {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.tag {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  color: var(--text-secondary);
  padding: 0.4rem 0.8rem;
  border-radius: 20px;
  font-size: 0.85rem;
  transition: all 0.3s;
}

.tag:hover {
  border-color: var(--accent-turquoise);
  color: var(--accent-turquoise);
  background: var(--accent-glow);
}

/* Timeline */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  border-left: 2px solid var(--border-glass);
  padding-left: 2rem;
  margin-left: 1rem;
}

.timeline-item {
  position: relative;
}

.timeline-marker {
  position: absolute;
  left: -2.45rem;
  top: 0.25rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent-turquoise);
  border: 3px solid var(--bg-primary);
  box-shadow: 0 0 0 2px var(--border-glass);
}

.timeline-content h4 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: #fff;
  margin-bottom: 0.25rem;
}

.meta {
  font-size: 0.85rem;
  color: var(--accent-purple);
  margin-bottom: 0.5rem;
  font-weight: 500;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.glass-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: 16px;
  padding: 1.5rem;
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.3s ease;
  backdrop-filter: blur(10px);
}

.glass-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.5), 0 0 15px var(--accent-glow);
  border-color: rgba(45, 212, 191, 0.3);
}

.card-header {
  margin-bottom: 1rem;
}

.glass-card h4 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: #fff;
  margin-top: 0.5rem;
}

.badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--bg-primary);
  background: var(--text-primary);
  padding: 0.2rem 0.6rem;
  border-radius: 12px;
}
.badge.highlight {
  background: var(--accent-purple);
  color: #fff;
}

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

/* Publications */
.publication-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.pub-item {
  padding: 1.25rem;
  border-radius: 12px;
  border: 1px solid transparent;
  background: rgba(255,255,255,0.02);
  transition: all 0.3s;
}

.pub-item:hover {
  background: var(--bg-glass);
  border-color: var(--border-glass);
}

.pub-title {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--accent-turquoise);
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.pub-authors {
  color: var(--text-primary);
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
}

.pub-authors b {
  color: #fff;
}

.pub-journal {
  color: var(--text-muted);
  font-size: 0.85rem;
  font-style: italic;
}

/* Lists */
.clean-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.clean-list li {
  padding-left: 1.5rem;
  position: relative;
  color: var(--text-secondary);
}

.clean-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent-purple);
}

.clean-list li strong {
  color: #fff;
}

.compact-list {
  list-style-type: disc;
  padding-left: 1.2rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
}
.compact-list li {
  margin-bottom: 0.5rem;
}
.compact-list b {
  color: #fff;
}

/* Footer */
.site-footer {
  padding: 3rem 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Animations */
.fade-in {
  animation: fadeUp 0.8s cubic-bezier(0.165, 0.84, 0.44, 1) both;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive */
@media (max-width: 960px) {
  .nav-container {
    justify-content: space-between;
    padding: 0 2rem;
  }
  .mobile-brand {
    display: block;
  }
  .layout-container {
    flex-direction: column;
  }
  .sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border-glass);
    padding: 2rem;
  }
  .sidebar-inner {
    position: static;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1.5rem;
  }
  .contact-card, .social-links {
    align-items: center;
    width: 100%;
    max-width: 400px;
    justify-content: center;
  }
  .main-content {
    padding: 0 2rem;
  }
}

@media (max-width: 600px) {
  .nav-menu {
    display: none; /* Hide top nav on very small screens for now */
  }
}