/* Reset and Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --primary-color: #2c3e50;
  --accent-color: #3498db;
  --text-color: #333;
  --text-light: #666;
  --bg-color: #fff;
  --bg-secondary: #f8f9fa;
  --border-color: #e9ecef;
  --font-family: 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Roboto Mono', monospace;
  --max-width: 900px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  color: var(--text-color);
  background: var(--bg-color);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent-color);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--primary-color);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

/* Header & Navigation */
.site-header {
  background: var(--bg-color);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar {
  padding: 1rem 0;
}

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

.site-title {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--primary-color);
}

.site-title:hover {
  color: var(--accent-color);
}

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

.nav-links a {
  color: var(--text-light);
  font-weight: 400;
  font-size: 0.95rem;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary-color);
  border-bottom-color: var(--accent-color);
}

/* Main Content */
.page-content {
  flex: 1;
  padding: 3rem 0;
}

/* About Page */
.about .profile {
  display: flex;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
  align-items: flex-start;
}

.profile-image img {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.profile-placeholder {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  font-weight: 500;
  color: #fff;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.profile-info {
  flex: 1;
}

.profile-name {
  font-size: 2rem;
  font-weight: 500;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.profile-position {
  font-size: 1.1rem;
  color: var(--text-light);
  margin-bottom: 0.25rem;
}

.profile-affiliation {
  font-size: 1rem;
  color: var(--text-light);
  margin-bottom: 1rem;
}

.social-links {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-secondary);
  color: var(--text-light);
  font-size: 1.2rem;
  transition: all 0.2s ease;
}

.social-links a:hover {
  background: var(--accent-color);
  color: #fff;
}

.about-content {
  font-size: 1.05rem;
}

.about-content p {
  margin-bottom: 1rem;
}

.about-content h2 {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--primary-color);
  margin: 2rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border-color);
}

.about-content ul {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.about-content li {
  margin-bottom: 0.5rem;
}

/* Page Headers */
.page-header {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--border-color);
}

.page-title {
  font-size: 2rem;
  font-weight: 500;
  color: var(--primary-color);
}

/* Publications */
.publications-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.publication {
  padding: 1.5rem;
  background: var(--bg-secondary);
  border-radius: 8px;
  border-left: 4px solid #b8860b;
  display: flex;
  gap: 1.5rem;
}

.pub-thumbnail {
  flex-shrink: 0;
  width: 180px;
  height: 120px;
  overflow: hidden;
  border-radius: 6px;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pub-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.pub-content {
  flex: 1;
  min-width: 0;
}

@media (max-width: 768px) {
  .publication {
    flex-direction: column;
  }
  .pub-thumbnail {
    width: 100%;
    height: 150px;
  }
}

.pub-title {
  display: block;
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.pub-authors {
  display: block;
  color: var(--text-light);
  margin-bottom: 0.25rem;
  font-size: 0.95rem;
}

.pub-venue {
  display: block;
  font-style: italic;
  color: var(--text-light);
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
}

.pub-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.pub-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.75rem;
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 0.85rem;
  transition: all 0.2s ease;
}

.pub-links a:hover {
  background: #8b6914;
  border-color: #8b6914;
  color: #fff;
}

/* CV Page */
.cv-section {
  margin-bottom: 2.5rem;
}

.cv-section h2 {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--primary-color);
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border-color);
}

.cv-item {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 1.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.cv-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.cv-date {
  flex-shrink: 0;
  width: 120px;
  font-weight: 500;
  color: var(--accent-color);
}

.cv-content h3 {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--primary-color);
  margin-bottom: 0.25rem;
}

.cv-content p {
  color: var(--text-light);
  margin-bottom: 0.25rem;
}

.cv-content .highlight {
  display: inline-block;
  background: #e8f4fd;
  color: var(--accent-color);
  padding: 0.1rem 0.5rem;
  border-radius: 4px;
  font-size: 0.85rem;
  margin-top: 0.25rem;
}

/* Footer */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 1.5rem 0;
  margin-top: auto;
}

.site-footer p {
  text-align: center;
  color: var(--text-light);
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
  .about .profile {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .profile-image img {
    width: 150px;
    height: 150px;
  }

  .social-links {
    justify-content: center;
  }

  .nav-links {
    gap: 1rem;
  }

  .cv-item {
    flex-direction: column;
    gap: 0.5rem;
  }

  .cv-date {
    width: auto;
  }
}