/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #2c3e50;
  --accent-color: #3498db;
  --text-color: #333;
  --text-light: #666;
  --bg-color: #fff;
  --bg-light: #f8f9fa;
  --border-color: #e1e4e8;
  --sidebar-width: 280px;
}

/* Dark mode colors */
[data-theme="dark"] {
  --primary-color: #e0e0e0;
  --accent-color: #64b5f6;
  --text-color: #e0e0e0;
  --text-light: #b0b0b0;
  --bg-color: #1a1a1a;
  --bg-light: #2d2d2d;
  --border-color: #404040;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-color);
  background: var(--bg-color);
  transition: background-color 0.3s ease, color 0.3s ease;
}

a {
  color: var(--accent-color);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: #2980b9;
}

/* Layout */
.wrapper {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-light);
  padding: 40px 30px;
  border-right: 1px solid var(--border-color);
  position: fixed;
  height: 100vh;
  overflow-y: auto;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.profile {
  text-align: center;
  margin-bottom: 30px;
}

.profile-image {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 20px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.site-title {
  font-size: 1.3em;
  font-weight: 600;
  margin-bottom: 5px;
  color: var(--primary-color);
}

.site-subtitle {
  font-size: 0.85em;
  color: var(--text-light);
  margin-bottom: 3px;
}

.site-affiliation {
  font-size: 0.8em;
  color: var(--text-light);
}

/* Navigation */
.nav {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-bottom: 30px;
}

.nav a {
  padding: 10px 15px;
  border-radius: 5px;
  color: var(--text-color);
  transition: background-color 0.3s ease, color 0.3s ease;
}

.nav a:hover,
.nav a.active {
  background: var(--accent-color);
  color: white;
}

/* Social links */
.social-links {
  display: flex;
  justify-content: center;
  gap: 15px;
  font-size: 1.3em;
}

.social-links a {
  color: var(--text-light);
  transition: color 0.3s ease, transform 0.3s ease;
}

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

/* Main content */
.content {
  margin-left: var(--sidebar-width);
  padding: 60px 80px;
  max-width: 900px;
  width: 100%;
  position: relative;
}

/* Theme toggle button */
.theme-toggle {
  position: fixed;
  top: 30px;
  right: 40px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 2px solid var(--border-color);
  background: var(--bg-light);
  color: var(--text-color);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2em;
  transition: all 0.3s ease;
  z-index: 100;
}

.theme-toggle:hover {
  background: var(--accent-color);
  color: white;
  border-color: var(--accent-color);
  transform: rotate(15deg);
}

/* Typography */
h1 {
  font-size: 1.8em;
  margin-bottom: 0.5em;
  color: var(--primary-color);
}

h2 {
  font-size: 1.4em;
  margin-top: 1.5em;
  margin-bottom: 0.7em;
  color: var(--primary-color);
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.3em;
}

h3 {
  font-size: 1.1em;
  margin-top: 1.2em;
  margin-bottom: 0.5em;
  color: var(--primary-color);
}

p {
  margin-bottom: 1em;
}

/* News section */
.news-list {
  list-style: none;
  margin-top: 1em;
}

.news-item {
  display: flex;
  gap: 20px;
  margin-bottom: 15px;
  padding-bottom: 15px;
  border-bottom: 1px solid var(--border-color);
}

.news-item:last-child {
  border-bottom: none;
}

.news-date {
  min-width: 90px;
  color: var(--text-light);
  font-size: 0.85em;
  font-weight: 500;
}

.news-content {
  flex: 1;
  font-size: 0.95em;
}

.news-content strong {
  color: var(--primary-color);
}

/* Publications */
.publications-list {
  display: grid;
  gap: 30px;
  margin-top: 2em;
}

.publication-item {
  display: flex;
  gap: 20px;
  padding: 20px;
  background: var(--bg-light);
  border-radius: 8px;
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

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

.publication-thumbnail {
  width: 150px;
  height: 150px;
  flex-shrink: 0;
  background: #2c3e50;
  border-radius: 5px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

[data-theme="dark"] .publication-thumbnail {
  background: #404040;
}

.publication-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.publication-info {
  flex: 1;
}

.publication-title {
  font-size: 1.0em;
  font-weight: 600;
  margin-bottom: 0.3em;
  color: var(--primary-color);
}

.publication-authors {
  font-size: 0.9em;
  color: var(--text-light);
  margin-bottom: 0.3em;
}

.publication-venue {
  font-style: italic;
  font-size: 0.9em;
  color: var(--text-light);
  margin-bottom: 0.5em;
}

.publication-awards {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 0.5em;
}

.award-badge {
  background: #f39c12;
  color: white;
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 0.85em;
  font-weight: 500;
}

.publication-links {
  display: flex;
  gap: 12px;
  margin-top: 0.5em;
  font-size: 0.9em;
}

.publication-links a {
  padding: 5px 12px;
  background: var(--accent-color);
  color: white;
  border-radius: 4px;
  transition: background 0.3s ease;
}

.publication-links a:hover {
  background: #2980b9;
}

/* Photography gallery */
.photo-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
  margin-top: 2em;
}

.photo-item {
  aspect-ratio: 1;
  overflow: hidden;
  border-radius: 8px;
  cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.photo-item:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.photo-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Group/mentoring section */
.mentee-list {
  list-style: none;
  margin-top: 1em;
}

.mentee-item {
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
}

.mentee-item:last-child {
  border-bottom: none;
}

.mentee-name {
  font-weight: 600;
  color: var(--primary-color);
}

.mentee-details {
  color: var(--text-light);
  font-size: 0.95em;
}

/* Contact box */
.contact-box {
  background: var(--bg-light);
  padding: 25px;
  border-radius: 8px;
  margin-top: 2em;
  border-left: 4px solid var(--accent-color);
}

.contact-box p {
  margin-bottom: 0.5em;
}

/* Footer */
.footer {
  margin-top: 60px;
  padding-top: 30px;
  border-top: 1px solid var(--border-color);
  text-align: center;
  color: var(--text-light);
  font-size: 0.9em;
}

/* Responsive design */
@media (max-width: 1024px) {
  .content {
    padding: 40px 50px;
  }
  
  .theme-toggle {
    top: 20px;
    right: 20px;
  }
}

@media (max-width: 768px) {
  .wrapper {
    flex-direction: column;
  }
  
  .sidebar {
    position: static;
    width: 100%;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }
  
  .content {
    margin-left: 0;
    padding: 30px 20px;
    padding-top: 70px;
  }
  
  .theme-toggle {
    top: 15px;
    right: 15px;
  }
  
  .publication-item {
    flex-direction: column;
  }
  
  .publication-thumbnail {
    width: 100%;
    height: 200px;
  }
  
  .photo-gallery {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  }
}

/* Utility classes */
.text-center {
  text-align: center;
}

.mt-2 {
  margin-top: 2em;
}

.mb-2 {
  margin-bottom: 2em;
}