/* ===== CSS VARIABLES ===== */
:root {
  /* Colors */
  --primary-color: #3b82f6;
  --primary-dark: #2563eb;
  --secondary-color: #64748b;
  --accent-color: #f59e0b;
  --success-color: #10b981;
  --danger-color: #ef4444;
  
  /* Light Theme */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --border-color: #e2e8f0;
  --shadow-light: rgba(0, 0, 0, 0.05);
  --shadow-medium: rgba(0, 0, 0, 0.1);
  --shadow-heavy: rgba(0, 0, 0, 0.15);
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;
  
  /* Border Radius */
  --border-radius-sm: 0.375rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 0.75rem;
  --border-radius-xl: 1rem;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease;
  --transition-slow: 0.3s ease;
  --transition-slower: 0.5s ease;
  
  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-popover: 1050;
  --z-tooltip: 1060;
}

/* Dark Theme */
[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border-color: #334155;
  --shadow-light: rgba(0, 0, 0, 0.2);
  --shadow-medium: rgba(0, 0, 0, 0.3);
  --shadow-heavy: rgba(0, 0, 0, 0.4);
}

/* ===== RESET & BASE STYLES ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-primary);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background-color var(--transition-base), color var(--transition-base);
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--spacing-sm);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

a {
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-base);
}

/* ===== UTILITIES ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-md);
}

.section-title {
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
  position: relative;
  display: inline-block;
}
.section-title-ex {
  margin-top: var(--spacing-3xl);
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
  position: relative;
  display: inline-block;
}

.section-title-ex::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  border-radius: 2px;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  border-radius: 2px;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  margin-bottom: var(--spacing-sm);
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--border-radius-md);
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition-base);
  cursor: pointer;
  border: none;
  font-family: inherit;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left var(--transition-slow);
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

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

/* ===== THEME TOGGLE ===== */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: var(--z-fixed);
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
  backdrop-filter: blur(10px);
}

.theme-toggle:hover {
  transform: scale(1.1);
  box-shadow: 0 8px 25px var(--shadow-medium);
}

.theme-toggle i {
  font-size: 1.2rem;
  transition: all var(--transition-base);
}

.theme-toggle .fa-sun {
  color: var(--accent-color);
}

.theme-toggle .fa-moon {
  color: var(--primary-color);
  position: absolute;
  opacity: 0;
  transform: rotate(180deg);
}

[data-theme="dark"] .theme-toggle .fa-sun {
  opacity: 0;
  transform: rotate(180deg);
}

[data-theme="dark"] .theme-toggle .fa-moon {
  opacity: 1;
  transform: rotate(0deg);
}

/* ===== NAVIGATION ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-base);
}

[data-theme="dark"] .navbar {
  background: rgba(15, 23, 42, 0.95);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

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

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  position: relative;
  padding: var(--spacing-xs) 0;
  transition: all var(--transition-base);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-color);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
}

.bar {
  width: 25px;
  height: 3px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-base);
}

/* ===== HERO SECTION ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  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 1000 1000"><defs><radialGradient id="a" cx="50%" cy="50%"><stop offset="0%" stop-color="%233b82f6" stop-opacity="0.1"/><stop offset="100%" stop-color="%233b82f6" stop-opacity="0"/></radialGradient></defs><circle cx="200" cy="300" r="100" fill="url(%23a)"/><circle cx="800" cy="200" r="150" fill="url(%23a)"/><circle cx="600" cy="700" r="120" fill="url(%23a)"/></svg>') no-repeat center;
  background-size: cover;
  opacity: 0.5;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  position: relative;
  z-index: 2;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
  margin-bottom: var(--spacing-3xl);
}

.hero-text {
  animation: slideInLeft 0.8s ease-out;
}

.hero-title {
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary-color) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.typing-text {
  display: inline-block;
  position: relative;
}

.typing-text::after {
  content: '|';
  animation: blink 1s infinite;
  color: var(--primary-color);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--primary-color);
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
}

.hero-description {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-xl);
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.hero-image {
  display: flex;
  justify-content: center;
  animation: slideInRight 0.8s ease-out;
}

.image-container {
  position: relative;
  width: 350px;
  height: 350px;
  border-radius: 50%;
  overflow: hidden;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  padding: 8px;
}

.profile-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  transition: transform var(--transition-slow);
}

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

.image-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, transparent, rgba(59, 130, 246, 0.2));
  border-radius: 50%;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.image-container:hover .image-overlay {
  opacity: 1;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  animation: slideInUp 1s ease-out 0.3s both;
}

.stat-item {
  text-align: center;
  padding: var(--spacing-lg);
  background: var(--bg-secondary);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border-color);
  transition: transform var(--transition-base);
}

.stat-item:hover {
  transform: translateY(-5px);
}

.stat-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  color: var(--text-secondary);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-size: 0.875rem;
}

.scroll-indicator {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

.scroll-arrow {
  width: 20px;
  height: 20px;
  border-right: 2px solid var(--primary-color);
  border-bottom: 2px solid var(--primary-color);
  transform: rotate(45deg);
}

/* ===== ABOUT SECTION ===== */
.about {
  padding: var(--spacing-3xl) 0;
  background: var(--bg-secondary);
}

.about-content {
  max-width: 800px;
  margin: 0 auto;
}

.intro-text {
  font-size: 1.125rem;
  line-height: 1.8;
  margin-bottom: var(--spacing-lg);
}

.specialties {
  margin-top: var(--spacing-xl);
}

.specialties h3 {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  color: var(--text-primary);
}

.specialty-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.specialty-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border-color);
  transition: all var(--transition-base);
}

.specialty-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px var(--shadow-medium);
}

.specialty-icon {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.specialty-content h4 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.specialty-content p {
  margin: 0;
  font-size: 0.9rem;
}

/* ===== SKILLS SECTION ===== */
.skills {
  padding: var(--spacing-3xl) 0;
}

.skills-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.skill-category {
  background: var(--bg-secondary);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border-color);
}

.category-title {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  color: var(--text-primary);
}

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

.skill-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--bg-primary);
  border-radius: var(--border-radius-md);
  border: 1px solid var(--border-color);
  transition: transform var(--transition-base);
}

.skill-item:hover {
  transform: translateY(-3px);
}

.skill-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.skill-name {
  font-weight: 500;
  color: var(--text-primary);
  flex-grow: 1;
}

.skill-level {
  width: 100px;
  height: 6px;
  background: var(--border-color);
  border-radius: 3px;
  overflow: hidden;
}

.skill-progress {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  border-radius: 3px;
  width: 0;
  transition: width 1s ease-out 0.5s;
}

/* ===== PROJECTS SECTION ===== */
.projects {
  padding: var(--spacing-3xl) 0;
  background: var(--bg-secondary);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-xl);
}

.project-card {
  background: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-color);
  transition: all var(--transition-base);
  animation: fadeInUp 0.6s ease-out;
}

.project-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 40px var(--shadow-heavy);
}

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

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

.project-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(59, 130, 246, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-base);
}

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

.project-card:hover .project-image img {
  transform: scale(1.1);
}

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

.project-link {
  width: 50px;
  height: 50px;
  background: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-color);
  font-size: 1.2rem;
  transition: transform var(--transition-base);
}

.project-link:hover {
  transform: scale(1.1);
}

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

.project-category {
  display: inline-block;
  background: var(--primary-color);
  color: white;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: var(--spacing-md);
}

.project-title {
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.project-description {
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.tech-tag {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
}

/* ===== EXPERIENCE SECTION ===== */
.experience {
  padding: var(--spacing-md) 0;
}

.experience-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.experience-card {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-lg);
  padding: var(--spacing-sm);
  background: var(--bg-secondary);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border-color);
  transition: transform var(--transition-base);
}

.experience-card:hover {
  transform: translateY(-5px);
}

.experience-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.experience-info h3 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.experience-info h4 {
  color: var(--primary-color);
  font-weight: 500;
  margin-bottom: var(--spacing-md);
}

.experience-details {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.detail-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-secondary);
  padding-right: 15px;
}

.detail-item i {
  color: var(--accent-color);
  font-size: 0.9rem;
}

.certifications h3 {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  padding-top: var(--spacing-xl);
  color: var(--text-primary);
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.cert-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: var(--bg-secondary);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border-color);
  transition: all var(--transition-base);
}

.cert-item:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px var(--shadow-medium);
}

.cert-icon {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.cert-info h4 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
  font-size: 1rem;
}

.cert-info p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
  font-size: 0.9rem;
}

.cert-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--primary-color);
  font-weight: 500;
  font-size: 0.9rem;
  transition: color var(--transition-base);
}

.cert-link:hover {
  color: var(--primary-dark);
}

/* ===== CONTACT SECTION ===== */
.contact {
  padding: var(--spacing-3xl) 0;
  background: var(--bg-secondary);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.contact-description {
  font-size: 1.125rem;
  line-height: 1.8;
  margin-bottom: var(--spacing-xl);
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.contact-method {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border-color);
  transition: all var(--transition-base);
}

.contact-method:hover {
  transform: translateX(10px);
  box-shadow: 0 10px 30px var(--shadow-medium);
}

.method-icon {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.method-info h4 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.method-info p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.contact-cta {
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  text-align: center;
  color: white;
}

.cta-content h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
  font-weight: 600;
}

.cta-content p {
  margin-bottom: var(--spacing-lg);
  opacity: 0.9;
}

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

.cta-content .btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

/* ===== FOOTER ===== */
.footer {
  padding: var(--spacing-xl) 0;
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  text-align: center;
}

.footer-info p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-link {
  color: var(--primary-color);
  font-weight: 500;
  transition: color var(--transition-base);
}

.footer-link:hover {
  color: var(--primary-dark);
}

/* ===== ANIMATIONS ===== */
@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes blink {
  0%, 50% {
    opacity: 1;
  }
  51%, 100% {
    opacity: 0;
  }
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateX(-50%) translateY(0);
  }
  40% {
    transform: translateX(-50%) translateY(-10px);
  }
  60% {
    transform: translateX(-50%) translateY(-5px);
  }
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 80px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 80px);
    background: var(--bg-primary);
    flex-direction: column;
    justify-content: flex-start;
    padding-top: var(--spacing-xl);
    transition: left var(--transition-base);
    border-top: 1px solid var(--border-color);
  }

  .nav-menu.active {
    left: 0;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.active .bar:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav-toggle.active .bar:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active .bar:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }

  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-buttons {
    justify-content: center;
  }

  .hero-stats {
    grid-template-columns: 1fr;
  }

  .image-container {
    width: 250px;
    height: 250px;
  }

  .contact-content {
    grid-template-columns: 1fr;
  }

  .footer-content {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .specialty-grid {
    grid-template-columns: 1fr;
  }

  .skill-grid {
    grid-template-columns: 1fr;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .cert-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-sm);
  }

  .hero {
    padding: var(--spacing-xl) 0;
  }

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

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .section-title {
    font-size: 2rem;
  }

  .experience-card {
    flex-direction: column;
    text-align: center;
  }

  .cert-item {
    flex-direction: column;
    text-align: center;
  }

  .contact-method {
    flex-direction: column;
    text-align: center;
  }
}

/* ===== LOADING STATES ===== */
.skill-progress[data-width="90%"] { width: 90%; }
.skill-progress[data-width="85%"] { width: 85%; }
.skill-progress[data-width="80%"] { width: 80%; }
.skill-progress[data-width="65%"] { width: 65%; }
.skill-progress[data-width="70%"] { width: 70%; }
.skill-progress[data-width="60%"] { width: 60%; }
.skill-progress[data-width="40%"] { width: 40%; }
.skill-progress[data-width="50%"] { width: 50%; }
.skill-progress[data-width="95%"] { width: 95%; }

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus styles for keyboard navigation */
.btn:focus,
.nav-link:focus,
.theme-toggle:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --border-color: #000;
    --shadow-light: rgba(0, 0, 0, 0.3);
    --shadow-medium: rgba(0, 0, 0, 0.5);
    --shadow-heavy: rgba(0, 0, 0, 0.7);
  }
}