/* Clean Dark Mode Portfolio Styles */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* CSS Custom Properties for Dark Theme */
:root {
  /* Dark Theme Colors */
  --bg-primary: #080810;
  --bg-secondary: #0e0e18;
  --bg-tertiary: #13131f;
  --bg-card: rgba(18, 18, 30, 0.75);
  --bg-card-hover: rgba(24, 24, 40, 0.85);
  --bg-hover: rgba(30, 30, 50, 0.6);

  /* Text Colors */
  --text-primary: #f0f0ff;
  --text-secondary: #a0a0c0;
  --text-muted: #606080;

  /* Accent Colors */
  --accent-blue: #6366f1;
  --accent-green: #10d9a0;
  --accent-purple: #a855f7;
  --accent-orange: #f59e0b;

  /* Borders */
  --border-color: rgba(99, 102, 241, 0.12);
  --border-hover: rgba(99, 102, 241, 0.3);

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 25px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.12);
  --shadow-glow-green: 0 0 30px rgba(16, 217, 160, 0.1);
  --shadow-glow-purple: 0 0 30px rgba(168, 85, 247, 0.12);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background: transparent;
  font-size: 16px;
  backdrop-filter: blur(10px);
  height: 100%;
  min-height: 100%;
}

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
  background: var(--bg-primary);
  height: 100%;
  min-height: 100%;
}

/* Navigation */
nav {
  background: rgba(8, 8, 16, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(99, 102, 241, 0.1);
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  transition: all var(--transition-medium);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.nav-brand {
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--text-primary);
  text-decoration: none;
  transition: color var(--transition-medium);
}

.nav-brand:hover {
  color: var(--accent-blue);
}

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

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: all var(--transition-medium);
  padding: 8px 12px;
  border-radius: 6px;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background: var(--bg-hover);
}

/* Hero Section */
.hero {
  padding: 120px 2rem 80px;
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

.hero-image {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  margin: 0 auto 2rem;
  object-fit: cover;
  border: 3px solid var(--accent-blue);
  transition: all var(--transition-medium);
}

.hero-image:hover {
  transform: scale(1.05);
  border-color: var(--accent-purple);
  box-shadow: var(--shadow-lg);
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-role {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--accent-green);
  margin-bottom: 1.25rem;
  letter-spacing: 0.02em;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}

.hero-description {
  font-size: 1.1rem;
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: 3rem;
}

/* Hero Badges */
.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  justify-content: center;
  margin-bottom: 0.5rem;
}

.hero-badge {
  background: rgba(59, 130, 246, 0.12);
  color: var(--accent-blue);
  border: 1px solid rgba(59, 130, 246, 0.3);
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.01em;
}

/* Stats Section */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: 1rem;
}

@media (max-width: 900px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 500px) {
  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 1.75rem 1rem;
  text-align: center;
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border-color: var(--border-hover);
}

.stat-number {
  display: block;
  font-size: 2.25rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.35rem;
}

.stat-label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
  line-height: 1.3;
}

/* Specialization Cards */
.specialization-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
}

@media (max-width: 900px) {
  .specialization-grid {
    grid-template-columns: 1fr;
  }
}

.spec-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
}

.spec-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
  opacity: 0;
  transition: opacity var(--transition-medium);
}

.spec-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.spec-card:hover::before {
  opacity: 1;
}

.spec-icon {
  font-size: 2.25rem;
  margin-bottom: 1rem;
  display: block;
}

.spec-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.spec-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

.spec-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.spec-tag {
  background: rgba(59, 130, 246, 0.1);
  color: var(--accent-blue);
  border: 1px solid rgba(59, 130, 246, 0.2);
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 500;
}

/* Project Category Badges */
.project-category-badge {
  display: inline-block;
  padding: 0.2rem 0.7rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  letter-spacing: 0.03em;
}

.badge-ai {
  background: rgba(139, 92, 246, 0.15);
  color: var(--accent-purple);
  border: 1px solid rgba(139, 92, 246, 0.3);
}

.badge-ml {
  background: rgba(59, 130, 246, 0.12);
  color: var(--accent-blue);
  border: 1px solid rgba(59, 130, 246, 0.25);
}

.badge-nlp {
  background: rgba(16, 185, 129, 0.12);
  color: var(--accent-green);
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.badge-de {
  background: rgba(245, 158, 11, 0.12);
  color: var(--accent-orange);
  border: 1px solid rgba(245, 158, 11, 0.25);
}

/* Project link buttons */
.btn-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.9rem;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  transition: all var(--transition-medium);
}

.btn-link:hover {
  color: var(--accent-blue);
  border-color: rgba(59, 130, 246, 0.4);
  background: rgba(59, 130, 246, 0.06);
  transform: translateY(-1px);
}

.btn-link-live {
  color: var(--accent-green);
  border-color: rgba(16, 185, 129, 0.3);
  background: rgba(16, 185, 129, 0.06);
}

.btn-link-live:hover {
  color: var(--accent-green);
  border-color: rgba(16, 185, 129, 0.5);
  background: rgba(16, 185, 129, 0.1);
}

/* Publication venue badge */
.pub-venue-badge {
  display: inline-block;
  background: rgba(139, 92, 246, 0.12);
  color: var(--accent-purple);
  border: 1px solid rgba(139, 92, 246, 0.25);
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  letter-spacing: 0.02em;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 24px;
  background: var(--accent-blue);
  color: white;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 500;
  transition: all var(--transition-medium);
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

.btn:hover {
  background: var(--accent-purple);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--accent-blue);
  border: 2px solid var(--accent-blue);
}

.btn-outline:hover {
  background: var(--accent-blue);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Sections */
.section {
  padding: 80px 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 3rem;
  color: var(--text-primary);
  text-align: center;
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-purple), var(--accent-blue), var(--accent-green));
  border-radius: 2px;
  box-shadow: 0 0 12px rgba(99, 102, 241, 0.4);
}

/* Cards */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(24px);
  border-radius: 18px;
  padding: 2.5rem;
  margin-bottom: 2rem;
  border: 1px solid var(--border-color);
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.04);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-blue), transparent);
  opacity: 0;
  transition: opacity var(--transition-medium);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.card:hover::before {
  opacity: 1;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.card-text {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.card-meta {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 3rem;
  grid-auto-flow: row dense;
}
@media (max-width: 1100px) {
  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 768px) {
  .skills-grid {
    grid-template-columns: 1fr;
  }
}

.skill-category {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  padding: 2.5rem;
  border-radius: 16px;
  border: 1px solid var(--border-color);
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
}

.skill-category::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-purple), transparent);
  opacity: 0;
  transition: opacity var(--transition-medium);
}

.skill-category:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.skill-category:hover::before {
  opacity: 1;
}

.skill-category h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.skill-list {
  color: var(--text-secondary);
  line-height: 1.6;
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.tech-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1.25rem;
  border-radius: 12px;
  transition: all var(--transition-medium);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid transparent;
}

.tech-item:hover {
  background: var(--bg-hover);
  transform: translateY(-6px);
  box-shadow: var(--shadow-md), var(--shadow-glow);
  border-color: var(--border-hover);
}

.tech-icon {
  width: 40px;
  height: 40px;
  margin-bottom: 0.5rem;
  transition: all var(--transition-medium);
}

.tech-item:hover .tech-icon {
  transform: scale(1.1);
}

.tech-name {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-align: center;
  transition: color var(--transition-medium);
}

.tech-item:hover .tech-name {
  color: var(--accent-blue);
  font-weight: 600;
}

/* Projects */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.project-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  padding: 2.5rem;
  border-radius: 16px;
  border: 1px solid var(--border-color);
  transition: all var(--transition-medium);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-green), transparent);
  opacity: 0;
  transition: opacity var(--transition-medium);
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.project-card:hover::before {
  opacity: 1;
}

.project-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
  transition: color var(--transition-medium);
}

.project-card:hover .project-title {
  color: var(--accent-blue);
}

.project-description {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tech-tag {
  background: var(--accent-blue);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 500;
  transition: all var(--transition-medium);
}

.tech-tag:hover {
  background: var(--accent-purple);
  transform: scale(1.05);
}

.project-actions {
  margin-top: 1rem;
  display: flex;
  gap: 0.5rem;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
  background: var(--accent-green);
  color: white;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 500;
  transition: all var(--transition-medium);
  border: none;
  cursor: pointer;
}

.btn-sm:hover {
  background: var(--accent-blue);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

/* Experience Items */
.experience-item {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  padding: 2.5rem;
  border-radius: 16px;
  margin-bottom: 2rem;
  border: 1px solid var(--border-color);
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
}

.experience-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-orange), transparent);
  opacity: 0;
  transition: opacity var(--transition-medium);
}

.experience-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.experience-item:hover::before {
  opacity: 1;
}

.experience-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-hover);
}

.experience-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.experience-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  transition: color var(--transition-medium);
}

.experience-item:hover .experience-title {
  color: var(--accent-blue);
}

.experience-company {
  color: var(--text-secondary);
  font-weight: 500;
}

.experience-date {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
}

.experience-description {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1rem;
}

/* Contact Section */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  margin-top: 3rem;
}

.contact-info {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  padding: 2.5rem;
  border-radius: 16px;
  border: 1px solid var(--border-color);
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
}

.contact-info::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-blue), transparent);
  opacity: 0;
  transition: opacity var(--transition-medium);
}

.contact-info:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.contact-info:hover::before {
  opacity: 1;
}

.contact-info h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.contact-info p {
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.contact-form {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  padding: 2.5rem;
  border-radius: 16px;
  border: 1px solid var(--border-color);
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
}

.contact-form::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-green), transparent);
  opacity: 0;
  transition: opacity var(--transition-medium);
}

.contact-form:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.contact-form:hover::before {
  opacity: 1;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-primary);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 1rem;
  transition: all var(--transition-medium);
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

/* Footer */
footer {
  background: var(--bg-tertiary);
  padding: 2rem;
  text-align: center;
  border-top: 1px solid var(--border-color);
  margin-top: 4rem;
}

footer p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-container {
    padding: 0 1rem;
  }
  
  .nav-links {
    gap: 1rem;
  }
  
  .hero {
    padding: 100px 1rem 60px;
  }
  
  .hero-title {
    font-size: 2.2rem;
  }

  .hero-role {
    font-size: 1.1rem;
  }

  .hero-badges {
    gap: 0.4rem;
  }
  
  .section {
    padding: 60px 1rem;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  .skills-grid {
    grid-template-columns: 1fr;
  }
  
  .tech-grid {
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  }
}

/* Animation Keyframes */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

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

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

.mb-1 {
  margin-bottom: 1rem;
}

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

.mt-1 {
  margin-top: 1rem;
}

.mt-3 {
  margin-top: 3rem;
}

/* Stagger Animation for Tech Items */
.tech-item {
  animation: fadeInUp 0.6s ease-out forwards;
  opacity: 0;
}

.tech-item:nth-child(1) { animation-delay: 0.1s; }
.tech-item:nth-child(2) { animation-delay: 0.2s; }
.tech-item:nth-child(3) { animation-delay: 0.3s; }
.tech-item:nth-child(4) { animation-delay: 0.4s; }
.tech-item:nth-child(5) { animation-delay: 0.5s; }
.tech-item:nth-child(6) { animation-delay: 0.6s; }

#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100%;
  z-index: 0;
  pointer-events: auto;
  display: block;
}

body > *:not(#bg-canvas) {
  position: relative;
  z-index: 1;
}

.skill-category-horizontal {
  grid-column: 1 / -1;
  width: 100%;
  margin: 2rem 0 0 0;
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border-color);
  padding: 2rem;
  box-sizing: border-box;
}
.skill-category-horizontal h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}
.skill-category-horizontal .tech-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  overflow-x: auto;
  justify-content: flex-start;
}
@media (max-width: 900px) {
  .skill-category-horizontal .tech-grid {
    flex-wrap: nowrap;
    gap: 1rem;
    overflow-x: auto;
  }
}

.concepts-cloud {
  margin: 2.5rem 0 0 0;
  padding: 2rem;
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border-color);
  box-sizing: border-box;
  width: 100%;
}
.concepts-cloud h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 1.2rem;
  color: var(--text-primary);
}
.concepts-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.concept-tag {
  display: inline-block;
  background: var(--accent-blue);
  color: #fff;
  border-radius: 999px;
  padding: 0.5rem 1.2rem;
  font-size: 0.95rem;
  font-weight: 500;
  box-shadow: 0 2px 8px rgba(59,130,246,0.08);
  transition: background 0.2s, color 0.2s;
  margin-bottom: 0.5rem;
}
.concept-tag:hover {
  background: var(--accent-purple);
  color: #fff;
}

/* Publication Card Styles */
.publication-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  padding: 2.5rem;
  border-radius: 16px;
  border: 1px solid var(--border-color);
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
  margin-bottom: 2rem;
}

.publication-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-purple), transparent);
  opacity: 0;
  transition: opacity var(--transition-medium);
}

.publication-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.publication-card:hover::before {
  opacity: 1;
}

.publication-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.publication-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0.25rem 0 0.1rem;
  flex: 1;
  min-width: 0;
  line-height: 1.35;
}

.publication-links {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
}

.publication-meta {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1rem;
  font-style: italic;
}

.publication-abstract {
  color: var(--text-primary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.publication-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* Presentation Container Styles */
.presentation-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(10px);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.presentation-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  max-width: 1200px;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.presentation-header h3 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 600;
}

.close-btn {
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 2rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 50%;
  transition: all var(--transition-medium);
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.close-btn:hover {
  background: var(--bg-hover);
  transform: scale(1.1);
}

.presentation-content {
  width: 100%;
  max-width: 1200px;
  height: calc(100vh - 150px);
  background: var(--bg-card);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.presentation-content iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* Publications Grid */
.publications-grid {
  display: grid;
  gap: 2rem;
  margin-bottom: 2rem;
}

/* Small Button Styles */
.btn-small {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  border-radius: 8px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition-medium);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
}

.btn-small:hover {
  background: var(--bg-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-small svg {
  width: 16px;
  height: 16px;
}

/* Project Links */
.project-links {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

/* Responsive Design for Publications */
@media (max-width: 768px) {
  .publication-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .publication-links {
    width: 100%;
    justify-content: flex-start;
  }
  
  .presentation-container {
    padding: 1rem;
  }
  
  .presentation-header h3 {
    font-size: 1.25rem;
  }
  
  .close-btn {
    width: 40px;
    height: 40px;
    font-size: 1.5rem;
  }
}

/* Form Message Styles */
.form-message {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: 8px;
  font-weight: 500;
  text-align: center;
  transition: all var(--transition-medium);
}

.form-message.success {
  background: rgba(34, 197, 94, 0.1);
  color: #16a34a;
  border: 1px solid rgba(34, 197, 94, 0.2);
}

.form-message.error {
  background: rgba(239, 68, 68, 0.1);
  color: #dc2626;
  border: 1px solid rgba(239, 68, 68, 0.2);
} 

/* --- EXPERIENCE & EDUCATION FONT IMPROVEMENTS --- */
.experience-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
  line-height: 1.2;
}

.experience-company {
  font-size: 1.1rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 0.1rem;
}

.experience-date {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  margin-top: 0.2rem;
  white-space: nowrap;
}

.experience-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

@media (max-width: 600px) {
  .experience-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.1rem;
  }
  .experience-title {
    font-size: 1.15rem;
  }
  .experience-company {
    font-size: 1rem;
  }
  .experience-date {
    font-size: 0.85rem;
    margin-top: 0.1rem;
  }
}

/* --- PROJECTS FONT IMPROVEMENTS --- */
.project-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  line-height: 1.2;
}

.project-description {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.2rem;
}

.project-tech, .project-links, .tech-tag {
  font-size: 0.95rem;
}

@media (max-width: 600px) {
  .project-title {
    font-size: 1.1rem;
  }
  .project-description {
    font-size: 0.97rem;
  }
  .project-tech, .project-links, .tech-tag {
    font-size: 0.85rem;
  }
}

/* ============================================
   REDESIGNED HERO — SPLIT LAYOUT
   ============================================ */
.hero-split {
  display: flex;
  align-items: center;
  gap: 4rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 130px 2rem 80px;
}

.hero-photo-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  flex-shrink: 0;
}

.hero-photo-ring {
  position: relative;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  padding: 3px;
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue), var(--accent-green));
  animation: ring-spin 6s linear infinite;
}

@keyframes ring-spin {
  0%   { background: linear-gradient(0deg,   var(--accent-purple), var(--accent-blue), var(--accent-green)); }
  33%  { background: linear-gradient(120deg, var(--accent-blue),   var(--accent-green), var(--accent-purple)); }
  66%  { background: linear-gradient(240deg, var(--accent-green),  var(--accent-purple), var(--accent-blue)); }
  100% { background: linear-gradient(360deg, var(--accent-purple), var(--accent-blue), var(--accent-green)); }
}

.hero-photo-ring .hero-image {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--bg-primary);
  display: block;
}

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

.social-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-medium);
}

.social-btn:hover {
  background: var(--bg-hover);
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  transform: translateY(-2px);
}

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

.hero-available-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.25);
  color: var(--accent-green);
  padding: 0.3rem 0.9rem;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  letter-spacing: 0.01em;
}

.available-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-green);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.5; transform: scale(0.75); }
}

.hero-title {
  font-size: 3.75rem;
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #fff 40%, rgba(255,255,255,0.6));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-role {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.role-tag {
  padding: 0.35rem 1rem;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.role-ai {
  background: rgba(139, 92, 246, 0.15);
  color: var(--accent-purple);
  border: 1px solid rgba(139, 92, 246, 0.3);
}

.role-de {
  background: rgba(16, 185, 129, 0.12);
  color: var(--accent-green);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.role-divider {
  color: var(--text-muted);
  font-weight: 300;
  font-size: 1.2rem;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.5rem;
  max-width: 540px;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.hero-badge {
  padding: 0.28rem 0.8rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.badge-purple {
  background: rgba(139, 92, 246, 0.1);
  color: var(--accent-purple);
  border: 1px solid rgba(139, 92, 246, 0.25);
}

.badge-teal {
  background: rgba(16, 185, 129, 0.08);
  color: var(--accent-green);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.badge-blue {
  background: rgba(59, 130, 246, 0.08);
  color: var(--accent-blue);
  border: 1px solid rgba(59, 130, 246, 0.2);
}

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

.btn-ghost {
  display: inline-block;
  padding: 12px 24px;
  background: transparent;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 8px;
  font-weight: 500;
  font-size: 1rem;
  border: 1px solid var(--border-color);
  transition: all var(--transition-medium);
}

.btn-ghost:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  background: var(--bg-hover);
}

@media (max-width: 900px) {
  .hero-split {
    flex-direction: column;
    text-align: center;
    padding: 110px 1.5rem 60px;
    gap: 2.5rem;
  }
  .hero-title {
    font-size: 2.75rem;
  }
  .hero-role, .hero-badges, .hero-cta {
    justify-content: center;
  }
  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }
}

@media (max-width: 500px) {
  .hero-title {
    font-size: 2.2rem;
  }
  .hero-photo-ring {
    width: 170px;
    height: 170px;
  }
}

/* ============================================
   STATS — IMPROVED
   ============================================ */
.stat-sub {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
  font-weight: 400;
  letter-spacing: 0.02em;
}

/* ============================================
   ABOUT CARD — REDESIGNED
   ============================================ */
.about-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border-radius: 20px;
  padding: 2.5rem;
  border: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

.about-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-purple), var(--accent-blue), var(--accent-green));
}

.about-lead {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2rem;
  line-height: 1.5;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.5rem;
}

.about-pillars {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.about-pillar {
  display: flex;
  gap: 1.25rem;
  padding: 1.25rem;
  border-radius: 12px;
  border-left: 3px solid transparent;
  background: rgba(255,255,255,0.02);
}

.pillar-ai  { border-left-color: var(--accent-purple); background: rgba(139,92,246,0.04); }
.pillar-de  { border-left-color: var(--accent-green);  background: rgba(16,185,129,0.04); }
.pillar-ml  { border-left-color: var(--accent-blue);   background: rgba(59,130,246,0.04); }

.pillar-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  line-height: 1;
  margin-top: 0.1rem;
}

.pillar-content h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
  letter-spacing: 0.01em;
}

.pillar-content p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin: 0;
}

.about-footer-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

.about-chip {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.3rem 0.9rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 500;
}

@media (max-width: 600px) {
  .about-pillar {
    flex-direction: column;
    gap: 0.75rem;
  }
}

/* ============================================
   SPEC CARDS — COLOR-DIFFERENTIATED
   ============================================ */
.spec-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
  border-top: 3px solid transparent;
}

.spec-ai  { border-top-color: var(--accent-purple); }
.spec-de  { border-top-color: var(--accent-green); }
.spec-ml  { border-top-color: var(--accent-blue); }

.spec-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.spec-icon-wrap {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  font-size: 1.5rem;
  margin-bottom: 1.1rem;
}

.spec-icon-ai { background: rgba(139, 92, 246, 0.12); }
.spec-icon-de { background: rgba(16, 185, 129, 0.1); }
.spec-icon-ml { background: rgba(59, 130, 246, 0.1); }

.spec-tag {
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 500;
}

.tag-ai { background: rgba(139,92,246,0.1);  color: var(--accent-purple); border: 1px solid rgba(139,92,246,0.2); }
.tag-de { background: rgba(16,185,129,0.08); color: var(--accent-green);  border: 1px solid rgba(16,185,129,0.2); }
.tag-ml { background: rgba(59,130,246,0.08); color: var(--accent-blue);   border: 1px solid rgba(59,130,246,0.2); }

/* ============================================
   STACK GROUPS
   ============================================ */
.stack-group {
  margin-bottom: 2.5rem;
}

.stack-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.3rem 1rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}

.stack-label-ai {
  background: rgba(139,92,246,0.1);
  color: var(--accent-purple);
  border: 1px solid rgba(139,92,246,0.25);
}

.stack-label-de {
  background: rgba(16,185,129,0.08);
  color: var(--accent-green);
  border: 1px solid rgba(16,185,129,0.2);
}

.stack-label-ml {
  background: rgba(59,130,246,0.08);
  color: var(--accent-blue);
  border: 1px solid rgba(59,130,246,0.2);
}

/* ============================================
   EXPLORE CARDS — REDESIGNED QUICK LINKS
   ============================================ */
.explore-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
}

@media (max-width: 768px) {
  .explore-grid { grid-template-columns: 1fr; }
}

.explore-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 2rem;
  border-radius: 16px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-medium);
  overflow: hidden;
  border-top: 3px solid transparent;
}

.explore-card-ai { border-top-color: var(--accent-purple); }
.explore-card-de { border-top-color: var(--accent-green); }
.explore-card-ml { border-top-color: var(--accent-blue); }

.explore-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.explore-icon {
  font-size: 2rem;
  margin-bottom: 0.25rem;
}

.explore-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.explore-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
}

.explore-arrow {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-top: 0.75rem;
  transition: all var(--transition-medium);
}

.explore-card:hover .explore-arrow {
  color: var(--accent-blue);
  transform: translateX(4px);
}