:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --secondary: #10b981;
  --accent: #f59e0b;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  
  /* Dark theme colors */
  --bg-primary: #0f0f23;
  --bg-secondary: #1a1a2e;
  --bg-tertiary: #16213e;
  --text-primary: #ffffff;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: rgba(255, 255, 255, 0.1);
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

/* Light theme */
[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --border: rgba(0, 0, 0, 0.1);
  --glass-bg: rgba(255, 255, 255, 0.25);
  --glass-border: rgba(0, 0, 0, 0.1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  transition: all var(--transition-normal);
  overflow-x: hidden;
}

/* WebGL Background */
#webgl-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

/* Glassmorphic effects */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-normal);
}

.glass-card:hover {
  background: var(--glass-bg);
  border-color: var(--primary);
  box-shadow: var(--shadow-xl);
  transform: translateY(-2px);
}

/* Header */
.sticky-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1030;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  transition: all var(--transition-normal);
}

.navbar {
  padding: var(--spacing-md) 0;
}

.navbar-brand {
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--primary) !important;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.navbar-brand:hover {
  color: var(--primary-dark) !important;
}

.nav-link {
  color: var(--text-secondary) !important;
  font-weight: 500;
  transition: all var(--transition-fast);
  position: relative;
  padding: var(--spacing-sm) var(--spacing-md) !important;
}

.nav-link:hover,
.nav-link:focus {
  color: var(--primary) !important;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: all var(--transition-fast);
  transform: translateX(-50%);
}

.nav-link:hover::after,
.nav-link:focus::after {
  width: 80%;
}

/* Theme toggle */
.theme-toggle {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--glass-bg);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.theme-toggle:hover,
.theme-toggle:focus {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* Mobile toggle */
.navbar-toggler {
  border: 1px solid var(--border);
  background: var(--glass-bg);
  border-radius: 8px;
  padding: var(--spacing-sm);
}

.navbar-toggler:focus {
  box-shadow: 0 0 0 2px var(--primary);
}

.navbar-toggler-icon {
  background-image: none;
  width: 24px;
  height: 24px;
  position: relative;
}

.navbar-toggler-icon::before,
.navbar-toggler-icon::after,
.navbar-toggler-icon {
  display: block;
  position: relative;
}

.navbar-toggler-icon::before {
  content: '';
  position: absolute;
  top: 0;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.navbar-toggler-icon::after {
  content: '';
  position: absolute;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon::before {
  transform: rotate(45deg);
  top: 50%;
}

.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon::after {
  transform: rotate(-45deg);
  bottom: 50%;
}

/* Hero section */
.hero-section {
  padding: var(--spacing-3xl) 0;
  position: relative;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

.hero-subtitle {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
}

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

.text-accent {
  color: var(--primary);
}

/* Concentric circles */
.concentric-circles {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--spacing-xl);
}

.outer-circle {
  width: 280px;
  height: 280px;
  border: 4px solid var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  animation: pulse 3s ease-in-out infinite;
  transition: all var(--transition-normal);
}

.outer-circle::before {
  content: '';
  position: absolute;
  top: -8px;
  left: -8px;
  right: -8px;
  bottom: -8px;
  border: 2px solid var(--primary);
  border-radius: 50%;
  opacity: 0.3;
  animation: rotate 20s linear infinite;
}

.inner-circle {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid var(--glass-border);
  box-shadow: var(--shadow-xl);
  transition: all var(--transition-normal);
}

.profile-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: all var(--transition-normal);
}

.concentric-circles:hover .outer-circle {
  border-color: var(--accent);
  transform: scale(1.05);
}

.concentric-circles:hover .profile-image {
  transform: scale(1.1);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Buttons */
.btn {
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: 12px;
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition-fast);
  border: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

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

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

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

.btn-outline:hover,
.btn-outline:focus {
  background: var(--primary);
  color: white;
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

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

/* Section titles */
.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  margin-bottom: var(--spacing-2xl);
  color: var(--text-primary);
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--primary);
  border-radius: 2px;
}

/* Fact badges */
.fact-badge {
  text-align: center;
  padding: var(--spacing-md);
  border-radius: 12px;
  background: var(--glass-bg);
  border: 1px solid var(--border);
  transition: all var(--transition-normal);
}

.fact-badge:hover {
  background: var(--primary);
  color: white;
  transform: translateY(-4px);
}

.fact-badge i {
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
  color: var(--primary);
  transition: all var(--transition-fast);
}

.fact-badge:hover i {
  color: white;
}

.fact-badge div {
  font-size: 0.9rem;
  font-weight: 500;
}

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
}

.skill-item {
  display: flex;
  align-items: center;
  padding: var(--spacing-md);
  background: var(--glass-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: all var(--transition-normal);
}

.skill-item:hover {
  background: var(--primary);
  color: white;
  transform: translateY(-2px);
  border-color: var(--primary);
}

.skill-icon {
  width: 40px;
  height: 40px;
  margin-right: var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary);
  color: white;
  border-radius: 8px;
  font-size: 1.2rem;
  transition: all var(--transition-fast);
}

.skill-item:hover .skill-icon {
  background: white;
  color: var(--primary);
}

.skill-info h4 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

.skill-level {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: var(--spacing-xs);
  transition: all var(--transition-fast);
}

.skill-item:hover .skill-level {
  color: rgba(255, 255, 255, 0.8);
}

/* Project cards */
.project-card {
  background: var(--glass-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  transition: all var(--transition-normal);
  position: relative;
  margin-bottom: var(--spacing-xl);
}

.project-card:hover,
.project-card:focus-within {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary);
}

.project-image {
  position: relative;
  overflow: hidden;
  height: 200px;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: all var(--transition-normal);
}

.project-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  opacity: 0;
  transition: all var(--transition-normal);
}

.project-card:hover .project-overlay,
.project-card:focus-within .project-overlay {
  opacity: 1;
}

.overlay-btn {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: white;
  color: var(--primary);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.overlay-btn:hover,
.overlay-btn:focus {
  background: var(--primary);
  color: white;
  transform: scale(1.1);
}

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

.project-content h3 {
  margin-bottom: var(--spacing-sm);
  font-size: 1.3rem;
  font-weight: 600;
}

.project-content p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

.project-links {
  display: flex;
  gap: var(--spacing-md);
}

.project-links .btn {
  flex: 1;
  font-size: 0.9rem;
  padding: var(--spacing-sm) var(--spacing-md);
}

/* Certificate grid */
.certificate-item {
  margin-bottom: var(--spacing-xl);
}

.certificate-thumbnail {
  width: 100%;
  height: 250px;
  object-fit: cover;
  border-radius: 12px;
  border: 1px solid var(--border);
  transition: all var(--transition-normal);
  cursor: pointer;
}

.certificate-thumbnail:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

/* Social links */
.social-links {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.social-link {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--glass-bg);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  text-decoration: none;
  font-size: 1.2rem;
  transition: all var(--transition-fast);
}

.social-link:hover,
.social-link:focus {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
  transform: translateY(-2px);
}

/* Forms */
.form-control {
  background: var(--glass-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  padding: var(--spacing-md);
  transition: all var(--transition-fast);
}

.form-control:focus {
  background: var(--glass-bg);
  border-color: var(--primary);
  color: var(--text-primary);
  box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.1);
}

.form-label {
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
}

.invalid-feedback {
  display: block;
  color: var(--error);
  font-size: 0.875rem;
  margin-top: var(--spacing-xs);
}

.was-validated .form-control:invalid {
  border-color: var(--error);
}

.was-validated .form-control:valid {
  border-color: var(--success);
}

/* Modal */
.modal-content {
  border: none;
  border-radius: 16px;
}

/* Footer */
footer {
  margin-top: var(--spacing-3xl);
}

/* Responsive design */
@media (max-width: 768px) {
  .hero-section {
    text-align: center;
  }
  
  .concentric-circles {
    margin-bottom: var(--spacing-xl);
  }
  
  .outer-circle {
    width: 220px;
    height: 220px;
  }
  
  .inner-circle {
    width: 160px;
    height: 160px;
  }
  
  .hero-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: center;
  }
  
  .hero-actions .btn {
    width: 200px;
  }
  
  .skills-grid {
    grid-template-columns: 1fr;
  }
  
  .social-links {
    justify-content: center;
  }
  
  .project-links {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .container {
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
  }
  
  .outer-circle {
    width: 180px;
    height: 180px;
  }
  
  .inner-circle {
    width: 130px;
    height: 130px;
  }
  
  .fact-badge {
    padding: var(--spacing-sm);
  }
  
  .fact-badge i {
    font-size: 1.5rem;
  }
  
  .fact-badge div {
    font-size: 0.8rem;
  }
}

/* Animation controls */
.webgl-paused #webgl-background {
  display: none;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .glass-card {
    background: var(--bg-secondary);
    border-width: 2px;
  }
  
  .btn-outline {
    border-width: 3px;
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  html {
    scroll-behavior: auto;
  }
}

/* Focus styles for better accessibility */
*:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Loading states */
.loading {
  opacity: 0.6;
  pointer-events: none;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid var(--primary);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}