/* ========================================
   MAIN.CSS - Core Styles for Academic Website
   ======================================== */

/* ========================================
   ADAPTIVE TYPOGRAPHY SYSTEM
   ======================================== */
:root {
  /* Typography Scale - Mobile First */
  --text-xs: clamp(0.75rem, 0.69rem + 0.31vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.81rem + 0.31vw, 1rem);
  --text-base: clamp(1rem, 0.91rem + 0.43vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1.01rem + 0.56vw, 1.25rem);
  --text-xl: clamp(1.25rem, 1.11rem + 0.69vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.28rem + 1.09vw, 1.875rem);
  --text-3xl: clamp(1.875rem, 1.58rem + 1.41vw, 2.25rem);
  --text-4xl: clamp(2.25rem, 1.89rem + 1.84vw, 2.75rem);
  --text-5xl: clamp(2.75rem, 2.31rem + 2.19vw, 3.25rem);
  
  /* Line Height Scale */
  --leading-none: 1;
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;
  
  /* Font Weights */
  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;
  
  /* Letter Spacing */
  --tracking-tight: -0.025em;
  --tracking-normal: 0em;
  --tracking-wide: 0.025em;
  --tracking-wider: 0.05em;
}

/* ========================================
   BASE STYLES
   ======================================== */
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  min-height: max(884px, 100dvh);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  font-size: var(--text-lg); /* Adaptive base font size */
  line-height: var(--leading-relaxed);
  font-weight: var(--font-normal);
  letter-spacing: var(--tracking-normal);
  transition: var(--theme-transition);
  
  /* Better text rendering */
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* ========================================
   LAYOUT COMPONENTS
   ======================================== */
.page-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

/* ========================================
   HEADER STYLES
   ======================================== */
.header {
  background-color: var(--bg-primary);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 10;
  transition: var(--theme-transition);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.site-title {
  font-size: var(--text-2xl);
  font-weight: var(--font-extrabold);
  color: var(--text-primary);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Theme Toggle Styles */
.theme-toggle-container {
  position: relative;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 0.375rem;
  background: none;
  border: 1px solid var(--border-primary);
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--theme-transition);
}

.theme-toggle:hover {
  background-color: var(--bg-tertiary);
  color: var(--primary-color);
  border-color: var(--border-accent);
}

.theme-toggle:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--primary-color);
}

.theme-dropdown {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 0.5rem;
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  padding: 0.5rem;
  min-width: 10rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-0.5rem);
  transition: var(--theme-transition);
  z-index: 1000;
}

.theme-dropdown.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.theme-option {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: none;
  background: none;
  color: #1f2937;
  cursor: pointer;
  border-radius: 0.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.25;
  transition: all 0.2s ease;
}

.theme-option:hover {
  background-color: #f3f4f6;
  color: #1173d4;
}

.theme-option.active {
  background-color: #1173d4;
  color: #ffffff;
}

.mobile-menu-button {
  display: block;
  padding: 0.5rem;
  border-radius: 0.375rem;
  color: var(--text-secondary);
  background: none;
  border: none;
  cursor: pointer;
  transition: var(--theme-transition);
}

.mobile-menu-button:hover {
  color: var(--text-primary);
  background-color: var(--bg-tertiary);
}

.mobile-menu-button:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--primary-color) inset;
}

.main-nav {
  display: none;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  text-decoration: none;
  font-size: 1.25rem !important; /* Increased mobile size for better readability */
  transition: var(--theme-transition);
}

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

.nav-link {
  font-size: 1rem; /* Back to standard desktop size */
}

.contact-link,
.contact-text {
  font-size: 1.125rem; /* Desktop size for contact text */
}

/* ========================================
   MAIN CONTENT
   ======================================== */
.main-content {
  flex-grow: 1;
}

/* ========================================
   SECTION STYLES
   ======================================== */
.section {
  padding-top: 3rem;
  padding-bottom: 3rem;
}

.section-white {
  background-color: var(--bg-primary);
  transition: var(--theme-transition);
}

.section-title {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  text-align: center;
  margin-bottom: 2rem;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}

/* ========================================
   ABOUT SECTION
   ======================================== */
.about-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}

.profile-image {
  flex-shrink: 0;
  width: 10rem;
  height: 10rem;
  border-radius: 50%;
  background-size: cover;
  background-position: center;
  box-shadow: var(--shadow-lg);
  transition: var(--theme-transition);
}

.about-text {
  text-align: center;
}

.about-name {
  font-size: var(--text-4xl);
  font-weight: var(--font-extrabold);
  color: var(--text-primary);
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
}

.about-title {
  font-size: var(--text-xl);
  color: var(--primary-color);
  font-weight: var(--font-semibold);
  margin-top: 0.25rem;
  line-height: var(--leading-snug);
}

.about-title a {
  color: inherit;
  text-decoration: none;
}

.about-title a:hover {
  text-decoration: underline;
}

.about-skills {
  margin-top: 0.5rem;
  color: var(--text-secondary);
  max-width: 42rem;
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  font-weight: var(--font-normal);
  transition: var(--theme-transition);
}

.about-description {
  margin-top: 3rem;
  max-width: 48rem;
  margin-left: auto;
  margin-right: auto;
}

.description-text {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  line-height: var(--leading-loose);
  font-weight: var(--font-normal);
  transition: var(--theme-transition);
}

/* ========================================
   CONTENT SECTIONS
   ======================================== */
.content-container {
  max-width: 48rem;
  margin-left: auto;
  margin-right: auto;
}

.content-text {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  line-height: var(--leading-loose);
  font-weight: var(--font-normal);
  transition: var(--theme-transition);
}

/* List styles within content */
.content-text ul {
  margin-top: 1rem;
  padding-left: 1.5rem;
}

.content-text li {
  font-size: var(--text-base);
  margin-bottom: 0.5rem;
  line-height: var(--leading-relaxed);
  font-weight: var(--font-normal);
}

/* ========================================
   RESEARCH PORTFOLIO SECTION
   ======================================== */
.research-filters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.filter-btn {
  padding: 0.5rem 1rem;
  border: 2px solid var(--border-primary);
  background: var(--bg-primary);
  color: var(--text-secondary);
  border-radius: 2rem;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  cursor: pointer;
  transition: var(--theme-transition);
}

.filter-btn:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.filter-btn.active {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: var(--text-inverse);
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.research-card {
  background: var(--bg-card);
  border-radius: 0.75rem;
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  transition: var(--theme-transition), transform 0.3s ease, box-shadow 0.3s ease;
  border: 1px solid var(--border-primary);
}

.research-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.research-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.research-icon {
  font-size: 2rem;
  color: var(--primary-color);
  background: var(--bg-secondary);
  padding: 0.5rem;
  border-radius: 0.5rem;
}

.research-status {
  display: flex;
  align-items: center;
}

.status-badge {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.status-badge.ongoing {
  background: #fef3c7;
  color: #d97706;
}

.status-badge.active {
  background: #dcfce7;
  color: #16a34a;
}

.status-badge.collaboration {
  background: #e0e7ff;
  color: #4f46e5;
}

.status-badge.featured {
  background: #fed7d7;
  color: #e53e3e;
}

.research-title {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  line-height: var(--leading-tight);
}

.research-description {
  color: var(--text-secondary);
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  margin-bottom: 1rem;
}

.research-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.tag {
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  padding: 0.25rem 0.75rem;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-radius: 1rem;
  transition: var(--theme-transition);
}

.research-metrics {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-primary);
}

.metric {
  text-align: center;
  flex: 1;
}

.metric-value {
  display: block;
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--primary-color);
  line-height: var(--leading-tight);
}

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

.research-summary {
  background: var(--bg-primary);
  border-radius: 1rem;
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  transition: var(--theme-transition);
}

.summary-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 2rem;
  text-align: center;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-number {
  font-size: var(--text-3xl);
  font-weight: var(--font-extrabold);
  color: var(--primary-color);
  line-height: var(--leading-none);
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  font-weight: var(--font-medium);
  margin-top: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Research card filtering visibility */
.research-card.hidden {
  opacity: 0;
  transform: scale(0.8);
  pointer-events: none;
}

.research-card.visible {
  opacity: 1;
  transform: scale(1);
  pointer-events: auto;
}

/* ========================================
   SMART PUBLICATION MANAGEMENT SYSTEM
   ======================================== */
.publication-controls {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: var(--bg-card);
  border-radius: 0.75rem;
  box-shadow: var(--shadow-md);
  transition: var(--theme-transition);
}

.publication-search {
  flex: 1;
}

.search-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 1rem;
  color: var(--text-secondary);
  z-index: 1;
}

.search-input {
  width: 100%;
  padding: 0.75rem 1rem 0.75rem 3rem;
  border: 2px solid var(--border-primary);
  border-radius: 2rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: var(--text-base);
  transition: var(--theme-transition);
}

.search-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(17, 115, 212, 0.1);
}

.clear-search {
  position: absolute;
  right: 0.75rem;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 50%;
  transition: var(--theme-transition);
}

.clear-search:hover {
  background: var(--bg-tertiary);
}

.publication-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.filter-select {
  padding: 0.5rem 1rem;
  border: 2px solid var(--border-primary);
  border-radius: 0.5rem;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: var(--theme-transition);
}

.filter-select:focus {
  outline: none;
  border-color: var(--primary-color);
}

.view-controls {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.view-toggle {
  padding: 0.5rem;
  border: 2px solid var(--border-primary);
  background: var(--bg-primary);
  color: var(--text-secondary);
  border-radius: 0.375rem;
  cursor: pointer;
  transition: var(--theme-transition);
}

.view-toggle.active,
.view-toggle:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.export-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--primary-color);
  color: var(--text-inverse);
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
  font-weight: var(--font-medium);
  transition: var(--theme-transition);
}

.export-btn:hover {
  background: var(--primary-hover);
}

.publication-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: var(--bg-primary);
  border-radius: 0.75rem;
  box-shadow: var(--shadow-md);
  transition: var(--theme-transition);
}

.publications-loading {
  text-align: center;
  padding: 3rem;
  color: var(--text-secondary);
}

.loading-spinner {
  width: 2rem;
  height: 2rem;
  border: 3px solid var(--border-primary);
  border-top: 3px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 1rem;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.publications-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.publication-item {
  background: var(--bg-card);
  border-radius: 0.75rem;
  padding: 2rem;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-primary);
  transition: var(--theme-transition), transform 0.2s ease, box-shadow 0.2s ease;
}

.publication-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

.publication-title {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  line-height: var(--leading-tight);
  margin-right: 1rem;
}

.publication-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  flex-shrink: 0;
}

.badge {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge.journal {
  background: #dbeafe;
  color: #1e40af;
}

.badge.conference {
  background: #fef3c7;
  color: #d97706;
}

.badge.open-access {
  background: #dcfce7;
  color: #16a34a;
}

.badge.best-paper {
  background: #fed7d7;
  color: #e53e3e;
}

.badge.highly-cited {
  background: #e0e7ff;
  color: #4f46e5;
}

.publication-meta {
  margin-bottom: 1rem;
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

.authors {
  margin-bottom: 0.5rem;
}

.author-name.primary {
  color: var(--text-primary);
  font-weight: var(--font-semibold);
}

.publication-details,
.citation-info {
  margin-bottom: 0.25rem;
}

.publication-abstract {
  margin-bottom: 1rem;
}

.publication-abstract p {
  color: var(--text-secondary);
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  margin-bottom: 0.5rem;
}

.expand-abstract {
  color: var(--primary-color);
  background: none;
  border: none;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  cursor: pointer;
  transition: var(--theme-transition);
}

.expand-abstract:hover {
  text-decoration: underline;
}

/* Compact mode styles for abstracts */
.abstract-preview {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  line-height: 1.4;
  margin-bottom: 0.5rem;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  text-overflow: ellipsis;
}

.abstract-full {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  line-height: 1.5;
  margin-bottom: 0.5rem;
}

.publication-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.keyword {
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  padding: 0.25rem 0.75rem;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-radius: 1rem;
  transition: var(--theme-transition);
}

.publication-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-primary);
}

.action-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border: 2px solid var(--border-primary);
  background: var(--bg-primary);
  color: var(--text-primary);
  text-decoration: none;
  border-radius: 0.5rem;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  cursor: pointer;
  transition: var(--theme-transition);
}

.action-btn:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.action-btn.primary {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: var(--text-inverse);
}

.action-btn.primary:hover {
  background: var(--primary-hover);
}

.load-more-container {
  text-align: center;
  margin: 2rem 0;
}

.load-more-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 2rem;
  background: var(--bg-primary);
  border: 2px solid var(--border-primary);
  color: var(--text-primary);
  border-radius: 2rem;
  cursor: pointer;
  font-weight: var(--font-medium);
  transition: var(--theme-transition);
}

.load-more-btn:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.external-link {
  text-align: center;
  padding: 2rem;
  margin-top: 2rem;
  background: var(--bg-secondary);
  border-radius: 0.75rem;
  transition: var(--theme-transition);
}

.external-link p {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin: 0;
  color: var(--text-secondary);
  font-size: var(--text-base);
}

.external-link a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: var(--font-medium);
}

.external-link a:hover {
  text-decoration: underline;
}

/* ========================================
   CITATION MODAL
   ======================================== */
.citation-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
}

.citation-modal {
  background: var(--bg-primary);
  border-radius: 0.75rem;
  width: 100%;
  max-width: 600px;
  max-height: 80vh;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  transition: var(--theme-transition);
}

.citation-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-primary);
}

.citation-modal-header h3 {
  margin: 0;
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
}

.close-modal {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 0.25rem;
  transition: var(--theme-transition);
}

.close-modal:hover {
  background: var(--bg-tertiary);
}

.format-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-primary);
}

.format-tab {
  flex: 1;
  padding: 1rem;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-weight: var(--font-medium);
  transition: var(--theme-transition);
}

.format-tab.active,
.format-tab:hover {
  color: var(--primary-color);
  background: var(--bg-secondary);
}

.citation-content {
  padding: 1.5rem;
  max-height: 300px;
  overflow-y: auto;
}

.citation-format {
  display: none;
}

.citation-format.active {
  display: block;
}

.citation-text {
  width: 100%;
  min-height: 120px;
  padding: 1rem;
  border: 2px solid var(--border-primary);
  border-radius: 0.5rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-family: 'Courier New', monospace;
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  resize: none;
  transition: var(--theme-transition);
}

.citation-text:focus {
  outline: none;
  border-color: var(--primary-color);
}

.citation-actions {
  display: flex;
  gap: 1rem;
  padding: 1.5rem;
  border-top: 1px solid var(--border-primary);
}

.copy-citation-btn,
.download-citation-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem;
  border: 2px solid var(--primary-color);
  background: var(--bg-primary);
  color: var(--primary-color);
  border-radius: 0.5rem;
  cursor: pointer;
  font-weight: var(--font-medium);
  transition: var(--theme-transition);
}

.copy-citation-btn:hover,
.download-citation-btn:hover {
  background: var(--primary-color);
  color: var(--text-inverse);
}

/* Publications Section - Legacy */
.publications-card {
  max-width: 48rem;
  margin-left: auto;
  margin-right: auto;
  background-color: var(--bg-card);
  padding: 1.5rem;
  border-radius: 0.5rem;
  box-shadow: var(--shadow-md);
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  font-weight: var(--font-normal);
  transition: var(--theme-transition);
}

.publications-card p {
  margin: 0;
}

.publications-card a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
}

.publications-card a:hover {
  text-decoration: underline;
}

/* ========================================
   CONTACT SECTION
   ======================================== */
.contact-grid {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  max-width: 72rem;
  margin-left: auto;
  margin-right: auto;
}

.contact-card {
  background-color: var(--bg-card);
  padding: 2rem;
  border-radius: 0.5rem;
  box-shadow: var(--shadow-lg);
  flex: 1;
  transition: var(--theme-transition);
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  font-size: var(--text-base);
  line-height: var(--leading-normal);
}

.contact-item {
  display: flex;
  align-items: center;
}

.contact-icon {
  color: var(--primary-color);
  margin-right: 0.75rem;
}

.contact-link {
  color: var(--text-primary);
  text-decoration: none;
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  line-height: var(--leading-normal);
  transition: var(--theme-transition);
}

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

.contact-text {
  color: var(--text-primary);
  font-size: var(--text-base);
  font-weight: var(--font-normal);
  line-height: var(--leading-normal);
  transition: var(--theme-transition);
}

/* ========================================
   MAPS SECTION
   ======================================== */
.maps-container {
  flex: 1;
}

.maps-title {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: 1rem;
  text-align: center;
  line-height: var(--leading-tight);
}

.maps-wrapper {
  position: relative;
  border-radius: 0.5rem;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  height: 300px;
  transition: var(--theme-transition);
}

.maps-iframe {
  width: 100%;
  height: 100%;
  border-radius: 0.5rem;
}

.maps-link-overlay {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  background: var(--bg-primary);
  color: var(--primary-color);
  padding: 0.5rem 0.75rem;
  border-radius: 0.375rem;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  transition: var(--theme-transition), transform 0.3s ease;
}

.maps-link-overlay:hover {
  background: var(--primary-color);
  color: var(--text-inverse);
  transform: scale(1.05);
}

/* ========================================
   FOOTER
   ======================================== */
.footer {
  background-color: var(--text-primary);
  color: var(--text-inverse);
  padding-top: 1rem;
  padding-bottom: 1rem;
  transition: var(--theme-transition);
}

.footer-content {
  text-align: center;
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
  font-weight: var(--font-normal);
}

/* ========================================
   MOBILE NAVIGATION
   ======================================== */
.mobile-nav {
  display: flex;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--bg-primary);
  border-top: 1px solid var(--border-primary);
  justify-content: space-around;
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
  transition: var(--theme-transition);
}

.mobile-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  text-decoration: none;
  color: var(--text-secondary);
  transition: var(--theme-transition);
}

.mobile-nav-item:hover {
  color: var(--primary-color);
}

.mobile-nav-item.active {
  color: var(--primary-color);
}

.mobile-nav-text {
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  line-height: var(--leading-tight);
}

/* ========================================
   RESPONSIVE LAYOUT
   ======================================== */
@media (min-width: 768px) {
  .section {
    padding-top: 5rem;
    padding-bottom: 5rem;
  }
  
  .about-container {
    flex-direction: row;
    gap: 3rem;
  }
  
  .about-text {
    text-align: left;
  }
  
  .about-description {
    margin-left: 0;
    margin-right: 0;
  }
  
  .mobile-menu-button {
    display: none;
  }
  
  .main-nav {
    display: flex;
  }
  
  .mobile-nav {
    display: none;
  }
  
  .contact-grid {
    flex-direction: row;
    gap: 3rem;
    align-items: flex-start;
  }
  
  .contact-card {
    max-width: 28rem;
  }
  
  .maps-container {
    max-width: 32rem;
  }
  
  .maps-title {
    text-align: left;
  }
  
  .maps-wrapper {
    height: 350px;
  }
  
  /* Research Portfolio Responsive Styles */
  .research-grid {
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
  }
  
  .research-filters {
    gap: 1rem;
  }
  
  .filter-btn {
    padding: 0.75rem 1.5rem;
    font-size: var(--text-base);
  }
  
  .research-summary {
    padding: 3rem;
  }
  
  .summary-stats {
    gap: 3rem;
  }
  
  /* Smart Publication Management Responsive Styles */
  .publication-controls {
    flex-direction: row;
    align-items: center;
    gap: 1.5rem;
  }
  
  .publication-search {
    flex: 2;
    max-width: 400px;
  }
  
  .publication-filters {
    flex: 1;
    justify-content: flex-end;
  }
  
  .view-controls {
    flex-shrink: 0;
  }
  
  .publication-stats {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .publication-item {
    padding: 2.5rem;
  }
  
  .publication-header {
    align-items: center;
  }
  
  .publication-actions {
    flex-wrap: nowrap;
    justify-content: flex-start;
  }
  
  .external-link p {
    font-size: var(--text-lg);
  }
  
  /* List View Styles */
  .publications-container.list-view .publication-item {
    padding: 1.5rem;
    border-radius: 0.5rem;
  }
  
  .publications-container.list-view .publication-header {
    margin-bottom: 0.5rem;
  }
  
  .publications-container.list-view .publication-title {
    font-size: var(--text-lg);
  }
  
  .publications-container.list-view .publication-abstract {
    display: none;
  }
  
  .publications-container.list-view .publication-keywords {
    margin-bottom: 1rem;
  }
  
  .publications-container.list-view .publication-actions {
    padding-top: 0.5rem;
    border-top: none;
  }
}