:root {
  --color-primary: #1e3a5f;
  --color-primary-light: #2d5a8a;
  --color-primary-dark: #0f1f33;
  --color-accent: #0077b6;
  --color-accent-light: #0096c7;
  --color-success: #2ecc71;
  --color-warning: #f39c12;
  --color-text: #2c3e50;
  --color-text-light: #5a6c7d;
  --color-text-muted: #7f8c8d;
  --color-bg: #ffffff;
  --color-bg-light: #f8f9fa;
  --color-bg-gray: #ecf0f1;
  --color-border: #e0e6ed;
  --color-border-dark: #cbd5e1;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.12);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg-light);
  margin: 0;
  padding: 0;
}

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

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

.site-header {
  background-color: var(--color-bg);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.95);
}

.site-nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: -0.3px;
}

.site-nav-items {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.page-link {
  color: var(--color-text-light);
  text-decoration: none;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition);
}

.page-link:hover {
  color: var(--color-primary);
  background-color: var(--color-bg-light);
}

.page-link.active {
  color: var(--color-accent);
  background-color: rgba(0, 119, 182, 0.08);
}

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

.wrapper {
  max-width: 100%;
}

.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  border-radius: var(--radius-lg);
  padding: 4rem 3rem;
  margin-bottom: 3rem;
  color: white;
  box-shadow: var(--shadow-lg);
}

.hero-content {
  display: flex;
  align-items: center;
  gap: 3rem;
}

.hero-text {
  flex: 1;
}

.hero-text h1 {
  font-size: 2.75rem;
  margin: 0 0 0.75rem 0;
  color: white;
  line-height: 1.2;
  letter-spacing: -1px;
}

.subtitle {
  font-size: 1.25rem;
  font-weight: 300;
  color: rgba(255, 255, 255, 0.85);
  margin: 0 0 1rem 0;
}

.hero-contact {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 1.5rem;
}

.hero-links {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.hero-avatar {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  font-weight: 700;
  color: white;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
  border: none;
  cursor: pointer;
}

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

.btn--primary:hover {
  background-color: var(--color-bg-light);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn--secondary {
  background-color: rgba(255, 255, 255, 0.15);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn--secondary:hover {
  background-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
}

.btn--small {
  padding: 0.4rem 0.9rem;
  font-size: 0.85rem;
  font-weight: 500;
}

.btn--outline {
  background-color: transparent;
  border: 1.5px solid var(--color-accent);
  color: var(--color-accent);
}

.btn--outline:hover {
  background-color: var(--color-accent);
  color: white;
}

.section {
  margin-bottom: 3rem;
}

h1, h2, h3, h4 {
  margin-top: 0;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.3;
}

h1 {
  font-size: 2.25rem;
  margin-bottom: 1.5rem;
  letter-spacing: -0.5px;
}

h2 {
  font-size: 1.75rem;
  margin: 2.5rem 0 1.25rem 0;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--color-border);
  letter-spacing: -0.3px;
}

h3 {
  font-size: 1.35rem;
  margin: 1.75rem 0 0.75rem 0;
  color: var(--color-primary-dark);
}

h4 {
  font-size: 1.15rem;
  margin: 1.25rem 0 0.5rem 0;
}

p {
  margin: 0 0 1rem 0;
  color: var(--color-text);
}

ul, ol {
  margin: 0 0 1rem 1.5rem;
  padding: 0;
}

li {
  margin: 0.35rem 0;
}

.card {
  background-color: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
  transition: var(--transition);
  border: 1px solid var(--color-border);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.publication-item {
  background-color: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
  border-left: 4px solid var(--color-accent);
  transition: var(--transition);
}

.publication-item:hover {
  box-shadow: var(--shadow-md);
}

.pub-title {
  font-size: 1.25rem;
  margin: 0 0 0.5rem 0;
  color: var(--color-primary);
  font-weight: 600;
}

.pub-authors {
  font-size: 0.95rem;
  color: var(--color-text-light);
  margin: 0 0 0.35rem 0;
  line-height: 1.5;
}

.pub-venue {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin: 0 0 0.5rem 0;
  font-style: italic;
}

.pub-author-type {
  display: inline-block;
  background: linear-gradient(135deg, var(--color-success), #27ae60);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.pub-links {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 0.75rem;
}

.pub-description {
  margin-top: 0.75rem;
  font-size: 0.925rem;
  line-height: 1.6;
  color: var(--color-text-light);
  padding-top: 0.75rem;
  border-top: 1px solid var(--color-border);
}

.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-primary));
  border-radius: 3px;
}

.timeline-item {
  position: relative;
  margin-bottom: 2rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2rem;
  top: 0.5rem;
  width: 12px;
  height: 12px;
  background-color: var(--color-accent);
  border-radius: 50%;
  transform: translateX(-4.5px);
  border: 3px solid var(--color-bg-light);
}

.timeline-date {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 0.25rem;
}

.timeline-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.25rem;
}

.timeline-subtitle {
  font-size: 0.95rem;
  color: var(--color-text-light);
  margin-bottom: 0.5rem;
}

.timeline-content {
  font-size: 0.95rem;
  color: var(--color-text);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.75rem 0;
}

.tag {
  display: inline-block;
  background-color: var(--color-bg-gray);
  color: var(--color-text-light);
  padding: 0.35rem 0.85rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.stat-card {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: white;
  padding: 1.75rem;
  border-radius: var(--radius-md);
  text-align: center;
  box-shadow: var(--shadow-md);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.stat-label {
  font-size: 0.95rem;
  opacity: 0.9;
}

.social-links {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-light);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
}

.social-link:hover {
  background-color: var(--color-bg-light);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.site-footer {
  background-color: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 2.5rem 2rem;
  margin-top: 4rem;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-text {
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer-links a:hover {
  color: white;
}

.research-section {
  margin-bottom: 2.5rem;
}

.research-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.research-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-primary);
}

.research-period {
  font-size: 0.9rem;
  color: var(--color-accent);
  font-weight: 500;
}

.research-org {
  font-size: 0.95rem;
  color: var(--color-text-light);
  margin-bottom: 0.75rem;
}

.cv-section {
  margin-bottom: 2rem;
}

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

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

.cv-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.cv-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-primary);
}

.cv-date {
  font-size: 0.9rem;
  color: var(--color-accent);
  font-weight: 500;
  white-space: nowrap;
}

.cv-org {
  font-size: 1rem;
  color: var(--color-text-light);
  margin-bottom: 0.5rem;
}

.cv-description {
  font-size: 0.95rem;
  color: var(--color-text);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.skill-category {
  background-color: var(--color-bg);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.skill-category-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

.skill-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.skill-list li {
  padding: 0.35rem 0;
  color: var(--color-text-light);
  font-size: 0.95rem;
}

.highlight {
  background: linear-gradient(120deg, rgba(0, 119, 182, 0.15) 0%, rgba(0, 119, 182, 0.15) 100%);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
}

@media (max-width: 900px) {
  .hero-content {
    flex-direction: column;
    text-align: center;
  }
  
  .hero-avatar {
    order: -1;
    width: 150px;
    height: 150px;
    font-size: 3rem;
  }
  
  .hero-links {
    justify-content: center;
  }
}

@media (max-width: 768px) {
  .site-nav {
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
  }
  
  .site-nav-items {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .page-content {
    padding: 1.5rem;
  }
  
  .hero {
    padding: 2.5rem 1.5rem;
  }
  
  .hero-text h1 {
    font-size: 2rem;
  }
  
  .subtitle {
    font-size: 1.1rem;
  }
  
  h1 {
    font-size: 1.8rem;
  }
  
  h2 {
    font-size: 1.45rem;
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}

@media print {
  .site-header,
  .site-footer,
  .hero-links,
  .pub-links,
  .btn {
    display: none !important;
  }
  
  body {
    background: white;
  }
  
  .page-content {
    padding: 0;
  }
}