:root {
  /* Colors */
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --secondary: #64748b;
  --bg-light: #ffffff;
  --bg-dark: #0f172a;
  --text-light: #1e293b;
  --text-dark: #f8fafc;
  --accent: #3b82f6;
  --card-bg-light: #f8fafc;
  --card-bg-dark: #1e293b;
  --border-light: #e2e8f0;
  --border-dark: #334155;
  
  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  
  /* Transitions */
  --transition: all 0.3s ease;
}

/* Default theme (light) */
:root {
  --bg: var(--bg-light);
  --text: var(--text-light);
  --card-bg: var(--card-bg-light);
  --border: var(--border-light);
}

/* Dark theme */
[data-theme="dark"] {
  --bg: var(--bg-dark);
  --text: var(--text-dark);
  --card-bg: var(--card-bg-dark);
  --border: var(--border-dark);
}

/* System preference fallback */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --bg: var(--bg-dark);
    --text: var(--text-dark);
    --card-bg: var(--card-bg-dark);
    --border: var(--border-dark);
  }
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --bg: var(--bg-light);
    --text: var(--text-light);
    --card-bg: var(--card-bg-light);
    --border: var(--border-light);
}
}

/* Base styles */
html {
    scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: var(--transition);
}

/* Modern container */
.container {
    width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-sm);
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  padding: var(--space-sm) 0;
  transition: var(--transition);
}

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

.logo {
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.5rem;
  transition: var(--transition);
}

.logo:hover {
  color: var(--primary);
}

.nav-links {
  display: flex;
  gap: var(--space-md);
    list-style: none;
  margin: 0;
  padding: 0;
}

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

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

/* Nav controls container */
.nav-controls {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* Theme toggle button */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 40px;
  height: 40px;
    cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
  transition: var(--transition);
}

.theme-toggle:hover {
  background: var(--card-bg);
  border-color: var(--primary);
  color: var(--primary);
}

.theme-toggle .sun-icon,
.theme-toggle .moon-icon {
  font-size: 1.2rem;
  transition: var(--transition);
}

[data-theme="dark"] .theme-toggle .sun-icon {
  display: block;
}

[data-theme="dark"] .theme-toggle .moon-icon {
  display: none;
}

[data-theme="light"] .theme-toggle .sun-icon {
  display: none;
}

[data-theme="light"] .theme-toggle .moon-icon {
  display: block;
}

/* Mobile menu */
.mobile-menu {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
}

.mobile-menu span {
  display: block;
  width: 25px;
  height: 3px;
  background: var(--text);
    margin: 5px 0;
  transition: var(--transition);
}

/* Hero section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--bg) 0%, rgba(37, 99, 235, 0.05) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="dots" width="8" height="8" patternUnits="userSpaceOnUse"><circle cx="2" cy="2" r="0.5" fill="%23e2e8f0" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23dots)"/></svg>');
  opacity: 0.8;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--text);
  margin: 0 0 var(--space-md) 0;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.3rem;
  color: #9aa4a9;
  margin: 0 0 var(--space-xl) 0;
  font-weight: 500;
  line-height: 1.6;
}

.hero-highlights {
    display: flex;
    flex-wrap: wrap;
  gap: var(--space-md);
  margin: 0 0 var(--space-xl) 0;
  justify-content: center;
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: var(--transition);
  min-width: 280px;
  flex: 1;
  max-width: 320px;
    position: relative;
  cursor: pointer;
}

.highlight-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
  border-color: var(--primary);
  background: rgba(37, 99, 235, 0.05);
}

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

.highlight-item i {
  color: var(--primary);
  font-size: 1.2rem;
  flex-shrink: 0;
}

.highlight-item span {
  color: var(--text);
  font-weight: 500;
  font-size: 0.95rem;
}

.hero-expertise {
  margin: 0 0 var(--space-xl) 0;
}

.hero-expertise h3 {
  color: var(--text);
  font-size: 1.2rem;
    font-weight: 600;
  margin: 0 0 var(--space-md) 0;
}

.expertise-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
}

.tag {
  background: var(--card-bg);
  color: var(--primary);
  padding: var(--space-sm) var(--space-md);
  border-radius: 25px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: var(--transition);
  border: 2px solid var(--primary);
}

.tag:hover {
  transform: translateY(-2px);
  background: var(--primary);
  color: white;
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
}

.hero-cta {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* Section styles */
.section {
  padding: var(--space-xl) 0;
}

.section-title {
  font-size: clamp(1.5rem, 2.5vw, 2.2rem);
  margin-bottom: var(--space-lg);
  text-align: center;
  color: var(--text);
  line-height: 1.2;
}

/* Experience section */
.experience-grid {
  display: grid;
  gap: var(--space-xl);
}

.experience-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: var(--space-xl);
  transition: var(--transition);
  position: relative;
}

.experience-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--primary);
}

.experience-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
  border-color: var(--primary);
}

.experience-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-lg);
  gap: var(--space-md);
}

.experience-header h3 {
  color: var(--text);
  font-size: 1.4rem;
  font-weight: 700;
  margin: 0;
}

.experience-duration {
  background: var(--primary);
  color: white;
  padding: var(--space-xs) var(--space-md);
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
}

.company-info {
  color: var(--secondary);
  font-size: 1rem;
  margin-bottom: var(--space-lg);
  padding: var(--space-md);
  background: rgba(37, 99, 235, 0.03);
  border-radius: 8px;
  border-left: 3px solid var(--primary);
}

.company-info strong {
  color: var(--primary);
  font-weight: 600;
}

.experience-highlights {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: var(--space-md);
}

.experience-highlights li {
  padding: var(--space-md);
  background: rgba(255, 255, 255, 0.02);
  border-radius: 8px;
  border: 1px solid var(--border);
  transition: var(--transition);
  position: relative;
  padding-left: calc(var(--space-lg) + 12px);
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
}

.experience-highlights li:hover {
  background: rgba(37, 99, 235, 0.05);
  border-color: var(--primary);
}

.experience-highlights li::before {
  content: '';
  position: absolute;
  left: var(--space-md);
  top: calc(var(--space-md) + 8px);
  width: 6px;
  height: 6px;
  background: var(--primary);
  border-radius: 50%;
  flex-shrink: 0;
}

.experience-highlights li strong {
  color: var(--primary);
  font-weight: 600;
  display: block;
  margin-bottom: var(--space-xs);
}

/* Experience section - remove emoji styles */
.experience-header h3::before {
  display: none;
}

/* Achievement badges */
.achievement-badge {
  display: inline-block;
  background: linear-gradient(135deg, #10b981, #059669);
  color: white;
  padding: var(--space-xs) var(--space-sm);
  border-radius: 12px;
  font-size: 0.75rem;
    font-weight: 600;
  margin-left: var(--space-sm);
}

@media (max-width: 768px) {
  .experience-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .experience-duration {
    align-self: flex-start;
}
  
  .experience-highlights li {
    padding-left: var(--space-lg);
  }
  
  .experience-highlights li::before {
    left: var(--space-sm);
  }
}

/* Project cards */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
}

.project-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: var(--transition);
}

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

.project-content {
  padding: var(--space-lg);
}

.project-content h3 {
  color: var(--text);
  margin: 0 0 var(--space-sm) 0;
}

.project-content p {
  color: var(--secondary);
  margin: 0 0 var(--space-md) 0;
}

.project-tech {
    display: flex;
  gap: var(--space-xs);
  flex-wrap: wrap;
  margin-bottom: var(--space-md);
}

.project-tech span {
  background: var(--primary);
  color: white;
  padding: var(--space-xs) var(--space-sm);
  border-radius: 20px;
  font-size: 0.8rem;
    font-weight: 500;
}

/* Blog styles */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.blog-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: var(--transition);
}

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

.blog-content {
  padding: var(--space-lg);
}

.blog-content h3 {
  color: var(--text);
  margin: 0 0 var(--space-sm) 0;
}

.blog-date {
  color: var(--secondary);
  font-size: 0.9rem;
  margin: 0 0 var(--space-sm) 0;
}

.blog-content p {
  color: var(--text);
  margin: 0 0 var(--space-md) 0;
}

.blog-cta {
  text-align: center;
  color: var(--text);
}

/* Skills section */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.skill-category {
  background: var(--card-bg);
  border: 1px solid var(--border);
  padding: var(--space-lg);
  border-radius: 16px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.skill-category::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}

.skill-category:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
  border-color: var(--primary);
}

.skill-category h3 {
  color: var(--text);
  margin: 0 0 var(--space-lg) 0;
  font-size: 1.3rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.skill-category h3::before {
  content: '🚀';
  font-size: 1.5rem;
}

.skill-category:nth-child(1) h3::before { content: '🤖'; }
.skill-category:nth-child(2) h3::before { content: '⚡'; }
.skill-category:nth-child(3) h3::before { content: '🔧'; }
.skill-category:nth-child(4) h3::before { content: '📈'; }

.skill-category ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: var(--space-sm);
}

.skill-category li {
  padding: var(--space-sm);
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 8px;
  border-left: 3px solid var(--primary);
  transition: var(--transition);
    display: flex;
    align-items: center;
  gap: var(--space-sm);
}

.skill-category li:hover {
  background: rgba(37, 99, 235, 0.1);
  transform: translateX(4px);
}

.skill-category li::before {
  content: "✓";
  color: var(--primary);
  font-weight: bold;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.skill-category li strong {
  color: var(--primary);
  font-weight: 600;
}

/* Contact section */
.contact {
    text-align: center;
  background: linear-gradient(to bottom, transparent, rgba(37, 99, 235, 0.05));
}

.contact-content {
  display: grid;
  gap: var(--space-lg);
}

.contact-info h3 {
  color: var(--text);
  margin: 0 0 var(--space-sm) 0;
}

.contact-info p {
  color: var(--secondary);
  margin: 0 0 var(--space-md) 0;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  align-items: center;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.contact-item i {
  color: var(--primary);
}

.contact-item a {
  color: var(--text);
  text-decoration: none;
  transition: var(--transition);
}

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

.social-links {
    display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.social-link {
  color: var(--text);
  font-size: 1.5rem;
  transition: var(--transition);
  text-decoration: none;
}

.social-link:hover {
  color: var(--primary);
  transform: translateY(-2px);
}

/* Button styles */
.btn {
  display: inline-block;
  padding: var(--space-sm) var(--space-md);
  border-radius: 8px;
  text-decoration: none;
  transition: var(--transition);
    font-weight: 500;
  border: 1px solid transparent;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  transform: translateY(-2px);
}

.btn:not(.btn-primary) {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn:not(.btn-primary):hover {
  background: var(--card-bg);
  border-color: var(--primary);
  color: var(--primary);
}

/* Animations */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
}
}

.animate-fade-up {
  animation: fadeUp 0.6s ease forwards;
}

/* Responsive design */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    }
  
  .mobile-menu {
    display: block;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.1rem;
  }
  
  .hero-highlights {
    flex-direction: column;
    align-items: center;
    }
  
  .highlight-item {
    max-width: 100%;
    min-width: auto;
    }
  
  .expertise-tags {
    justify-content: flex-start;
    }
  
  .hero-cta {
    flex-direction: column;
    align-items: center;
  }
  
  .experience-header {
    flex-direction: column;
    align-items: flex-start;
    }
}

/* Education section */
.education-grid {
  display: grid;
  gap: var(--space-lg);
    }

.education-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: var(--space-lg);
  transition: var(--transition);
    }

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

.education-header {
        display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-md);
    }

.education-header h3 {
  color: var(--text);
  margin: 0;
    }

.education-duration {
  background: var(--primary);
  color: white;
  padding: var(--space-xs) var(--space-sm);
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 500;
}

.education-info {
  margin-bottom: var(--space-md);
    }

.education-info strong {
  color: var(--text);
  font-weight: 600;
  font-size: 1.1rem;
}

.degree-specialization {
  color: var(--secondary);
  margin: var(--space-xs) 0;
  font-style: italic;
}

.education-description {
  color: var(--text);
  margin: var(--space-sm) 0;
    }

.coursework h4 {
  color: var(--text);
  margin: 0 0 var(--space-md) 0;
  font-size: 1.1rem;
    }

.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-md);
    }

.course-category h5 {
  color: var(--primary);
  margin: 0 0 var(--space-sm) 0;
  font-size: 1rem;
  font-weight: 600;
    }

.course-category ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.course-category li {
  padding: var(--space-xs) 0;
  color: var(--text);
  font-size: 0.9rem;
  position: relative;
  padding-left: var(--space-md);
    }

.course-category li::before {
  content: "•";
  color: var(--primary);
  position: absolute;
  left: 0;
  font-weight: bold;
}