/* CSS Variables for consistent theming */
:root {
  --color-primary: #2A5CAA;
  --color-primary-hover: #1E4580;
  --color-primary-active: #15325C;
  --color-secondary: #6C757D;
  --color-background: #FFFFFF;
  --color-surface: #F8F9FA;
  --color-text: #212529;
  --color-text-secondary: #6C757D;
  --color-border: #DEE2E6;
  --color-success: #198754;
  --color-warning: #FFC107;
  --color-error: #DC3545;
  --color-info: #0DCAF0;
}



/* Dark mode variables - Applied to html.dark-mode for immediate effect */
html.dark-mode {
  --color-background: #121212;
  --color-surface: #1E1E1E;
  --color-text: #FFFFFF;
  --color-text-secondary: #B0B0B0;
  --color-border: #333333;
}

/* Ensure consistent initial state and prevent flash */
html {
  background-color: #FFFFFF;
  transition: background-color 0.1s ease;
}

html.dark-mode {
  background-color: #121212;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
  transition: background-color 0.1s ease, color 0.1s ease;
}

/* Prevent flash during theme transitions */
html.dark-mode body {
  background-color: #121212;
  color: #FFFFFF;
}

/* Header and Navigation */
.header {
  background: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem 0;
  transition: background-color 0.1s ease, border-color 0.1s ease;
}

.nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

.role-title {
  display: inline-flex;
  align-items: center;
  gap: .5rem;          /* space between text and icon */
  margin: 0;           /* keep headings tidy */
}

.nav-links a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.1s ease, background-color 0.1s ease;
  padding: 0.5rem 1rem;
  border-radius: 8px;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-primary);
  background: rgba(42, 92, 170, 0.1);
}

/* Theme Toggle Button */
#themeToggle {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: 50%;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.1s ease;
  font-size: 1.2rem;
  color: var(--color-text);
}

#themeToggle:hover {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

/* Mobile Navigation */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-text);
}

/* Main Content */
.main {
  margin-top: 80px;
  min-height: calc(100vh - 80px);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

/* Hero Section */
.hero {
  padding: 4rem 0;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
  margin-bottom: 4rem;
}

.left-column {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

/* Profile Photo Styling */
.profile-photo-container {
  width: 200px;
  height: 200px;
  margin-bottom: 2rem;
  position: relative;
}

.profile-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  border: 4px solid var(--color-primary);
  box-shadow: 0 8px 32px rgba(42, 92, 170, 0.2);
  transition: all 0.3s ease;
}

.profile-photo:hover {
  transform: scale(1.05);
  box-shadow: 0 12px 40px rgba(42, 92, 170, 0.3);
}

.profile-photo-placeholder {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  border: 4px solid var(--color-primary);
  background: var(--color-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: var(--color-text-secondary);
  transition: all 0.3s ease;
}

.profile-photo-placeholder:hover {
  transform: scale(1.05);
  background: var(--color-primary);
  color: white;
}

/* Social Media Links */
.social-links {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  justify-content: center;
  flex-wrap: wrap;
}

.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.social-link:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

/* Individual Social Media Colors on Hover - All use primary blue */
.social-link.email:hover,
.social-link.linkedin:hover,
.social-link.github:hover,
.social-link.twitter:hover,
.social-link.scholar:hover {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

/* Hero Text */
.hero-title {
  font-size: 3rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.25rem;
}

.hero-institution {
  font-size: 1.2rem;
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: 1rem;
}

.hero-description {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 2rem;
}

/* Hero Buttons */
.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
}

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

.btn--primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(42, 92, 170, 0.3);
}

.btn--secondary {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn--secondary:hover {
  background: var(--color-primary);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(42, 92, 170, 0.3);
}

/* Right Column */
.right-column {
  display: flex;
  flex-direction: column;
}

/* Card Component */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  transition: all 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.12);
}

.card h3 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 1rem;
}

.card p {
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  line-height: 1.6;
}

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

/* Recent Updates Section */
.recent-updates {
  margin-top: 4rem;
  padding-top: 4rem;
  border-top: 1px solid var(--color-border);
}

.recent-updates h2 {
  font-size: 2rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 2rem;
  text-align: center;
}

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

.update-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.5rem;
  transition: all 0.3s ease;
}

.update-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

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

.update-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

.update-description {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
}

.update-date {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.update-type {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--color-primary);
  color: white;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Section Styles for Other Pages */
.section {
  padding: 2rem 0;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.2rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 2rem 0;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
  }

  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .mobile-nav-toggle {
    display: block;
  }

  .hero-content {
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: center;
  }

  .left-column {
    order: 1;
  }

  .right-column {
    order: 2;
  }

  .profile-photo-container {
    width: 150px;
    height: 150px;
    margin-bottom: 1.5rem;
  }

  .social-links {
    margin-bottom: 1.5rem;
  }

  .social-link {
    width: 44px;
    height: 44px;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.3rem;
  }

  .hero-institution {
    font-size: 1.1rem;
  }

  .hero-description {
    font-size: 1rem;
  }

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

  .btn {
    width: 100%;
    max-width: 300px;
  }

  .updates-container {
    grid-template-columns: 1fr;
  }

  .container {
    padding: 1rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .section-subtitle {
    font-size: 1.1rem;
  }
}

@media (max-width: 480px) {
  .profile-photo-container {
    width: 120px;
    height: 120px;
  }

  .hero-title {
    font-size: 2rem;
  }

  .social-links {
    gap: 0.5rem;
  }

  .social-link {
    width: 40px;
    height: 40px;
  }

  .card {
    padding: 1.5rem;
  }
}

/* Dark Mode Support for All Components */
html.dark-mode .social-link {
  background: var(--color-surface);
  border-color: var(--color-border);
  color: var(--color-text-secondary);
}

html.dark-mode .profile-photo-placeholder {
  background: var(--color-surface);
  color: var(--color-text-secondary);
}

html.dark-mode .profile-photo-placeholder:hover {
  background: var(--color-primary);
  color: white;
}

/* Additional Page Styles */
.publications-grid,
.projects-grid,
.blogs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

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

.card-title {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

.card-title a {
  color: inherit;
  text-decoration: none;
}
.card-meta {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

.card-description {
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: rgba(42, 92, 170, 0.1);
  color: var(--color-primary);
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
}

.status-badge {
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
}

.status-badge.active {
  background: var(--color-success);
  color: white;
}

.status-badge.completed {
  background: var(--color-primary);
  color: white;
}

/* CV Page Styles */
.cv-section {
  margin-bottom: 3rem;
}

.cv-section h3 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 0.5rem;
}

.cv-item {
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: var(--color-surface);
  border-radius: 12px;
  border: 1px solid var(--color-border);
}

.cv-item h4 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

.cv-item .institution {
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.25rem;
}

.cv-item .date {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.5rem;
}

.cv-item .description {
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* Roles Page Styles */
.roles-container {
  max-width: 800px;
  margin: 0 auto;
}

.role-entry {
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: var(--color-surface);
  border-radius: 12px;
  border: 1px solid var(--color-border);
  transition: all 0.3s ease;
}

.role-entry:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

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

.role-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.25rem;
}

.role-institution {
  color: var(--color-primary);
  font-weight: 500;
}

.role-date {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  white-space: nowrap;
  background: rgba(42, 91, 170, 0.252);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-weight: 500;
}

.role-description {
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-top: 1rem;
}

/* Blog Styles */
.blog-meta {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.blog-date,
.blog-category,
.blog-reading-time {
  font-size: 0.8rem;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-weight: 500;
}

.blog-date {
  background: rgba(42, 92, 170, 0.1);
  color: var(--color-primary);
}

.blog-category {
  background: var(--color-primary);
  color: white;
}

.blog-reading-time {
  background: var(--color-surface);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}