/* Modern Personal Homepage Stylesheet */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --text: #1f2937;
  --text-light: #6b7280;
  --bg: #f9fafb;
  --card-bg: #ffffff;
  --border: #e5e7eb;
  --accent: #10b981;
}

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

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

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  padding: 0 2rem;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}

.nav-logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--primary);
  text-decoration: none;
}

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

.nav-links a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

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

/* Hero Section */
.hero {
  padding: 120px 2rem 60px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 3rem;
  align-items: center;
}

.hero-content h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.hero-content h2 {
  font-size: 1.5rem;
  font-weight: 400;
  opacity: 0.9;
  margin-bottom: 1.5rem;
}

.hero-content p {
  font-size: 1.1rem;
  opacity: 0.8;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.hero-content p i {
  width: 20px;
  text-align: center;
}

.hero-links {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
}

.hero-links a {
  color: white;
  text-decoration: none;
  padding: 0.75rem 1.5rem;
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: 8px;
  transition: all 0.2s;
}

.hero-links a:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.5);
}

.hero-avatar {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  border: 4px solid rgba(255,255,255,0.3);
  object-fit: cover;
  box-shadow: 0 20px 40px rgba(0,0,0,0.2);
}

/* Sections */
.section {
  padding: 60px 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 2rem;
  color: var(--text);
  position: relative;
  padding-bottom: 0.5rem;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 4px;
  background: var(--primary);
  border-radius: 2px;
}

/* Bio Section */
.bio-content {
  font-size: 1.1rem;
  color: var(--text-light);
  max-width: 1000px;
  padding: 0 1rem;
}

.bio-content a {
  color: inherit;
  text-decoration: none;
  font-weight: 500;
  border-bottom: 1px dotted var(--text-light);
  transition: all 0.2s;
}

.bio-content a:hover,
.bio-content a:visited,
.bio-content a:active,
.bio-content a:focus {
  color: inherit;
  text-decoration: none;
  border-bottom-color: var(--primary);
}

.research-interests {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.5rem;
  justify-content: flex-start;
}

.interest-tag {
  background: var(--primary);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 500;
}

/* Projects Grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 2rem;
}

.project-card {
  background: var(--card-bg);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 4px 6px rgba(0,0,0,0.05);
  transition: transform 0.2s, box-shadow 0.2s;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0,0,0,0.1);
}

.project-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.project-content {
  padding: 1.5rem;
}

.project-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.project-content p {
  color: var(--text-light);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

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

.project-links a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
}

.project-links a:hover {
  text-decoration: underline;
}

/* Experience */
.experience-list {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.experience-item {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  gap: 1.5rem;
  align-items: center;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.experience-logo {
  width: 80px;
  height: 80px;
  object-fit: contain;
  border-radius: 8px;
}

.experience-content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

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

.experience-date {
  color: var(--primary);
  font-weight: 500;
}

/* Awards */
.awards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.award-card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.award-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.award-content h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.award-content p {
  color: var(--text-light);
  font-size: 0.9rem;
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.5rem;
}

.contact-card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  text-decoration: none;
  color: var(--text);
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  transition: transform 0.2s;
}

.contact-card:hover {
  transform: translateY(-2px);
}

.contact-icon {
  width: 48px;
  height: 48px;
  background: var(--primary);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.25rem;
}

.contact-info h4 {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.contact-info p {
  color: var(--text-light);
  font-size: 0.9rem;
}

/* Footer */
.footer {
  background: var(--text);
  color: white;
  padding: 2rem;
  text-align: center;
}

.footer p {
  opacity: 0.7;
  font-size: 0.9rem;
}

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

.publication-item {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.pub-status {
  display: inline-block;
  background: var(--primary);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
  margin-bottom: 0.75rem;
}

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

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

.pub-year {
  color: var(--primary);
  font-weight: 500;
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-content h1 {
    font-size: 2rem;
  }
  
  .hero-avatar {
    width: 160px;
    height: 160px;
    margin: 0 auto;
  }
  
  .hero-links {
    justify-content: center;
    flex-wrap: wrap;
  }
  
  .nav-links {
    display: none;
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  .experience-item {
    flex-direction: column;
    text-align: center;
  }
  
  .bio-content {
    padding: 0 1rem;
    font-size: 1rem;
  }
  
  .research-interests {
    justify-content: center;
    gap: 0.5rem;
  }
  
  .interest-tag {
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
  }
}

@media (max-width: 480px) {
  .section {
    padding: 40px 1rem;
  }
  
  .section-title {
    font-size: 1.5rem;
  }
  
  .bio-content {
    font-size: 0.95rem;
  }
  
  .interest-tag {
    padding: 0.35rem 0.7rem;
    font-size: 0.75rem;
  }
}