/* Core Reset & Font Setup */
:root {
  --font-body: 'Ubuntu', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Charter', 'Bitstream Charter', 'Sitka Text', 'Source Serif 4', Georgia, serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

body {
  font-family: var(--font-body);
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Background Radial Glow Effects */
.bg-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(180px);
  opacity: 0.08;
  z-index: -1;
  pointer-events: none;
}

.bg-glow-1 {
  width: 550px;
  height: 550px;
  top: -120px;
  right: -100px;
  background: var(--glow-1);
}

.bg-glow-2 {
  width: 650px;
  height: 650px;
  bottom: -150px;
  left: -150px;
  background: var(--glow-2);
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header & Navbar */
.navbar-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(14px);
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.3s ease;
}

[data-theme="dark"] .navbar-header {
  background-color: var(--bg-card);
}

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
}

.nav-brand {
  display: flex;
  flex-direction: column;
  text-decoration: none;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.brand-tag {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-menu {
  display: flex;
  gap: 0.5rem;
}

.nav-link {
  background: none;
  border: none;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 0.5rem 0.85rem;
  border-radius: 0.375rem;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.nav-link:hover {
  color: var(--accent-secondary);
  background-color: var(--tag-bg);
}

.nav-link.active {
  color: var(--accent-primary);
  font-weight: 700;
  background-color: var(--accent-light);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.theme-toggle,
.mobile-menu-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 0.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: all 0.2s ease;
}

.theme-toggle:hover,
.mobile-menu-toggle:hover {
  border-color: var(--accent-secondary);
  color: var(--accent-secondary);
}

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

/* Hero Profile Section */
.hero-section {
  padding: 3.5rem 0 2.5rem 0;
}

.hero-container {
  display: flex;
  align-items: center;
  gap: 2.5rem;
}

.hero-avatar-wrapper {
  flex-shrink: 0;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 2px solid var(--border-color);
}

.avatar-placeholder {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--dark-amethyst), var(--pacific-blue));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 4.5rem;
}

.hero-avatar-img {
  width: 100%;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  object-fit: cover;
  object-position: center;
  border-radius: 50%;
  display: block;
}

.hero-details {
  flex-grow: 1;
}

.hero-name {
  font-family: var(--font-serif);
  font-size: 2.35rem;
  font-weight: 400;
  line-height: 1.25;
  color: var(--text-primary);
}

.hero-role {
  font-size: 1.1rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-top: 0.3rem;
}

.hero-role-item {
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.hero-role-location {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: normal;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  margin-left: 0.4rem;
}

.hero-location {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 0.9rem;
}

.affiliation-link-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  padding: 0.3rem 0.75rem;
  border-radius: 9999px;
  background-color: var(--tag-bg);
  color: var(--tag-text);
  text-decoration: none;
  font-weight: 500;
  border: 1px solid var(--border-color);
  transition: all 0.2s ease;
}

.affiliation-link-badge:hover {
  background-color: var(--dark-amethyst);
  color: white;
  border-color: var(--dark-amethyst);
  transform: translateY(-1px);
}

.research-summary-line {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-top: 0.65rem;
  font-style: italic;
  line-height: 1.5;
}

.notebook-callout-box {
  margin-top: 1.5rem;
  padding: 1.1rem 1.35rem;
  border-radius: 0.5rem;
  background-color: var(--tag-bg);
  border-left: 4px solid var(--accent-primary);
  font-size: 0.98rem;
  color: var(--tag-text);
}

.notebook-callout-box a {
  color: var(--tag-text);
  font-weight: 700;
  text-decoration: underline;
}

.notebook-callout-box a:hover {
  opacity: 0.85;
}

.badge-tag {
  background-color: var(--tag-bg);
  color: var(--tag-text);
  font-size: 0.78rem;
  padding: 0.25rem 0.7rem;
  border-radius: 9999px;
  font-weight: 500;
  border: 1px solid var(--border-color);
}

.hero-links {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.social-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 0.375rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  text-decoration: none;
  font-size: 1.1rem;
  transition: all 0.2s ease;
}

.social-btn:hover {
  color: white;
  background-color: var(--dark-amethyst);
  border-color: var(--dark-amethyst);
  transform: translateY(-2px);
}

/* Tab Content Layout */
.main-content {
  padding-top: 2.5rem;
  padding-bottom: 5rem;
}

.tab-pane {
  display: none;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.tab-pane.active {
  display: block;
  opacity: 1;
}

.content-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  padding: 1.75rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.content-card h2,
.content-card h3 {
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.85rem;
}

.bio-text {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text-primary);
  white-space: pre-wrap;
}

.content-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

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

.fields-list li {
  padding: 0.4rem 0;
  border-bottom: 1px dashed var(--border-color);
  color: var(--text-primary);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border-radius: 0.375rem;
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

.btn-primary:hover {
  background-color: var(--btn-hover-bg);
  color: var(--btn-hover-text);
  transform: translateY(-2px);
}

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

.btn-outline:hover {
  border-color: var(--accent-secondary);
  color: var(--accent-secondary);
}

/* Research Tab & Papers List */
.section-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.filter-controls {
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}

.search-box {
  position: relative;
  width: 280px;
}

.search-box i {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.search-box input {
  width: 100%;
  padding: 0.5rem 0.75rem 0.5rem 2.25rem;
  border-radius: 0.375rem;
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  color: var(--text-primary);
  font-size: 0.875rem;
  font-family: var(--font-body);
}

.type-filter {
  display: flex;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 0.375rem;
  padding: 0.2rem;
}

.filter-btn {
  background: none;
  border: none;
  font-size: 0.8rem;
  padding: 0.35rem 0.75rem;
  border-radius: 0.25rem;
  color: var(--filter-btn-text);
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font-body);
}

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

/* Paper Card Item */
.paper-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  padding: 1.5rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.paper-card:hover {
  border-color: var(--pacific-blue);
}

.paper-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
}

.paper-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.paper-type-badge {
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border-radius: 0.25rem;
  font-weight: 600;
  text-transform: uppercase;
  white-space: nowrap;
}

.paper-type-badge.working_paper {
  background-color: var(--badge-wp);
  color: var(--badge-wp-text);
}

.paper-type-badge.published {
  background-color: var(--badge-pub);
  color: var(--badge-pub-text);
}

.paper-authors {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-top: 0.35rem;
}

.paper-journal {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--accent-secondary);
  margin-top: 0.2rem;
}

.paper-abstract {
  font-size: 0.92rem;
  color: var(--text-primary);
  margin-top: 0.75rem;
  line-height: 1.65;
}

.paper-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--border-color);
  flex-wrap: wrap;
  gap: 0.75rem;
}

.paper-jel {
  display: flex;
  gap: 0.35rem;
}

.jel-tag {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background-color: var(--tag-bg);
  color: var(--tag-text);
  padding: 0.15rem 0.45rem;
  border-radius: 0.25rem;
}

.paper-actions {
  display: flex;
  gap: 0.5rem;
}

.btn-sm {
  padding: 0.35rem 0.65rem;
  font-size: 0.8rem;
}

/* Timeline Components */
.timeline-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  border-left: 2px solid var(--border-color);
  padding-left: 1.25rem;
  margin-left: 0.5rem;
}

.timeline-item {
  position: relative;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -1.65rem;
  top: 0.35rem;
  width: 0.65rem;
  height: 0.65rem;
  border-radius: 50%;
  background-color: var(--accent-secondary);
}

.timeline-period {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.timeline-title {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-primary);
}

.timeline-institution {
  color: var(--text-primary);
  font-size: 0.9rem;
}

/* Tags cloud */
.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag-item {
  background-color: var(--tag-bg);
  color: var(--tag-text);
  font-size: 0.85rem;
  padding: 0.35rem 0.75rem;
  border-radius: 0.375rem;
  border: 1px solid var(--border-color);
}

/* Contact Page Grid */
.contact-details-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.contact-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.contact-item i {
  font-size: 1.5rem;
  color: var(--accent-secondary);
  margin-top: 0.2rem;
}

/* Modal Overlay */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.6);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(4px);
}

.modal-overlay.active {
  display: flex;
}

.modal-container {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  width: 90%;
  max-width: 600px;
  box-shadow: var(--shadow-md);
  padding: 1.5rem;
}

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

.modal-close-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
}

.modal-body pre {
  background-color: var(--tag-bg);
  padding: 1rem;
  border-radius: 0.375rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  white-space: pre-wrap;
  color: var(--text-primary);
}

.modal-footer {
  margin-top: 1rem;
  display: flex;
  justify-content: flex-end;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-color);
  padding: 2rem 0;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
}

/* Responsive Breakpoints */
@media (max-width: 768px) {
  .hero-container {
    flex-direction: column;
    text-align: center;
  }

  .hero-badges,
  .hero-links {
    justify-content: center;
  }

  .content-grid-2 {
    grid-template-columns: 1fr;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 4.25rem;
    left: 0;
    right: 0;
    background-color: var(--bg-card);
    flex-direction: column;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
  }

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

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