:root {
  --primary-color: #1976d2;
  --secondary-color: #004ba0;
  --text-color: #333;
  --bg-color: #f6f8fa;
  --border-color: #e0e0e0;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text-color);
  line-height: 1.6;
  padding-top: 70px;
}

/* Constrain main content width on wide screens for better readability */
main.container-xl {
  padding-left: 2rem;
  padding-right: 2rem;
}

@media (min-width: 1200px) {
  main.container-xl {
    max-width: 1200px !important;
  }
}

/* Navigation */
.navbar {
  background-color: var(--bg-color);
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  padding: 1rem 0;
}

.navbar-brand {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--primary-color);
  text-decoration: none;
}

.navbar-brand:hover {
  color: var(--secondary-color);
}

.nav-link {
  color: var(--text-color);
  font-weight: 500;
  margin: 0 0.5rem;
  transition: color 0.3s;
}

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

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

/* Hero Section */
.page-header {
  background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
  color: white;
  padding: 4rem 0;
  margin-bottom: 3rem;
}

.page-title {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.page-description {
  font-size: 1.25rem;
  opacity: 0.9;
}

/* Sections */
.section {
  margin-bottom: 0.5rem !important;
  padding: 1rem 0.5rem !important;
  background-color: var(--bg-color);
}

.section h2 {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 0.75rem !important;
  margin-top: 0 !important;
  color: var(--primary-color);
  border-bottom: 3px solid var(--primary-color);
  padding-bottom: 0.5rem;
}

/* Smaller titles for team page subsections */
section#intern-supervision h2,
section#tech-leadership h2,
section#management h2,
section#academic-supervision h2,
section#academic-collaborators h2,
section#my-mentors h2 {
  font-size: 1.5rem;
  border-bottom-width: 2px;
}

/* Avatar */
.avatar {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--primary-color);
}

/* Team member photo */
.team-member-photo {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  border: 0.5px solid var(--primary-color);
  flex-shrink: 0;
}

/* Team member link */
.team-member-link {
  color: var(--text-color);
  text-decoration: none;
  transition: color 0.3s;
}

.team-member-link:hover {
  color: var(--primary-color);
  text-decoration: none;
}

/* Profile Info */
.profile-info {
  margin-bottom: 1rem;
}

.profile-name {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-color);
  margin-bottom: 0.5rem;
}

.profile-title {
  font-size: 1.1rem;
  color: #666;
  margin-bottom: 0.25rem;
}

.profile-org {
  font-size: 1rem;
  margin-bottom: 0;
}

.profile-org a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.3s;
}

.profile-org a:hover {
  color: var(--secondary-color);
  text-decoration: underline;
}

/* Social Icons */
.social-icons {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 1.5rem;
}

.social-icons a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--primary-color);
  color: white;
  border-radius: 50%;
  text-decoration: none;
  transition: all 0.3s;
  font-size: 1.2rem;
}

.social-icons a:hover {
  background-color: var(--secondary-color);
  transform: translateY(-2px);
}

/* Cards */
.card {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  transition: all 0.3s;
  height: 100%;
  width: 100%;
  box-sizing: border-box;
  min-width: 0;
  background-color: #fdfdfd;
}

.card:hover {
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  transform: translateY(-2px);
}

.publication-links {
  display: inline-flex;
  gap: 0.125rem;
  flex-wrap: wrap;
  align-items: center;
  vertical-align: middle;
}

/* Smaller buttons in publication cards */
.card-text .btn,
.publication-links .btn,
.news-card .card-body .btn {
  padding: 0.15rem 0.4rem;
  font-size: 0.75rem;
  line-height: 1.2;
  vertical-align: middle;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--text-color);
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.card-text {
  color: #666;
  font-size: 0.95rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.card-text.small {
  font-size: 0.875em;
}

.card-text > span:first-child {
  display: inline-flex;
  align-items: center;
}

.btn-group {
  margin-top: 0.5rem;
}

.btn {
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
}

/* News Cards */
.news-card {
  margin-bottom: 1.5rem;
}

.news-card .card-text {
  display: block;
}

.news-card .card-text .btn {
  display: inline-block;
  vertical-align: baseline;
  margin-left: 0.5rem;
}

/* Reduce spacing in publication cards */
.news-card .card-body > div.mb-2 {
  margin-bottom: 0.125rem !important;
}

.news-card .card-body {
  padding: 0.5rem;
}

.news-card .text-muted.small {
  margin-bottom: 0.125rem !important;
}

/* Reduce spacing in talk cards */
.card .card-body {
  padding: 0.5rem;
}

.card .card-text {
  margin-bottom: 0.35rem;
}

.card .btn-group .btn {
  padding: 0.15rem 0.4rem;
  font-size: 0.75rem;
  line-height: 1.2;
  margin-right: 0.25rem;
  margin-bottom: 0;
}

.news-date {
  color: #999;
  font-size: 0.9rem;
}

/* Footer */
.site-footer {
  background-color: #f8f9fa;
  border-top: 1px solid var(--border-color);
  margin-top: 4rem;
  padding: 2rem 0;
}

/* Responsive */
@media (max-width: 768px) {
  .page-title {
    font-size: 2rem;
  }
  
  .page-description {
    font-size: 1rem;
  }
  
  .avatar {
    width: 150px;
    height: 150px;
  }
  
  .section h2 {
    font-size: 1.5rem;
  }
  
  .profile-name {
    font-size: 1.25rem;
  }
  
  .profile-title {
    font-size: 1rem;
  }
  
  .profile-org {
    font-size: 0.95rem;
  }
}

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
}

/* Section spacing */
section {
  scroll-margin-top: 80px;
}

/* Publications Pagination */
.publications-pagination {
  margin-bottom: 1rem;
}

/* News Pagination */
.news-pagination {
  margin-bottom: 1rem;
}

.pagination-controls {
  flex-wrap: wrap;
}

.pagination-info {
  font-weight: 500;
  color: var(--text-color);
  min-width: 120px;
  text-align: center;
}

.pagination-btn {
  min-width: 100px;
}

.pagination-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.pagination-dots {
  flex-wrap: wrap;
}

.pagination-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--primary-color);
  background-color: transparent;
  cursor: pointer;
  transition: all 0.3s;
  padding: 0;
}

.pagination-dot:hover {
  background-color: var(--primary-color);
  opacity: 0.7;
}

.pagination-dot.active {
  background-color: var(--primary-color);
}

@media (max-width: 768px) {
  .pagination-controls {
    gap: 1rem !important;
  }
  
  .pagination-info {
    font-size: 0.9rem;
    min-width: 100px;
  }
  
  .pagination-btn {
    min-width: 80px;
    font-size: 0.9rem;
    padding: 0.4rem 0.8rem;
  }
}