/* ===== CSS VARIABLES ===== */
:root {
  /* Light Theme Colors */
  --primary-color: #667eea;
  --primary-dark: #5a6fd8;
  --secondary-color: #764ba2;
  --accent-color: #4facfe;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
  
  /* Background Colors */
  --bg-primary: #f8fafb;
  --bg-secondary: #eff2f6;
  --bg-tertiary: #e5e9ef;
  --bg-card: #ffffff;
  --bg-overlay: rgba(250, 251, 252, 0.95);
  
  /* Text Colors */
  --text-primary: #1a202c;
  --text-secondary: #4a5568;
  --text-tertiary: #718096;
  --text-inverse: #ffffff;
  
  /* Border & Shadow */
  --border-color: #c8d4e0;
  --border-light: #d1dde6;
  --shadow-sm: 0 2px 4px 0 rgba(0, 0, 0, 0.12);
  --shadow-md: 0 6px 12px -2px rgba(0, 0, 0, 0.18), 0 3px 6px -1px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, 0.22), 0 6px 12px -2px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 24px 40px -8px rgba(0, 0, 0, 0.25), 0 12px 20px -5px rgba(0, 0, 0, 0.18);
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-secondary: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --gradient-accent: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
  --gradient-card: linear-gradient(145deg, #ffffff 0%, #f4f7fb 50%, #eef3f8 100%);
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  
  /* Typography */
  --font-primary: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Space Grotesk', 'Poppins', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
}

/* Dark Theme */
.dark-theme {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-card: #1e293b;
  --bg-overlay: rgba(15, 23, 42, 0.9);
  
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-tertiary: #94a3b8;
  --text-inverse: #0f172a;
  
  --border-color: #334155;
  --border-light: #475569;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
  
  --gradient-card: linear-gradient(145deg, #1e293b 0%, #334155 100%);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
}

/* ===== UTILITY CLASSES ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-md);
  }
}

/* ===== LOADING ANIMATION ===== */
.page-loader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.page-loader.hidden {
  opacity: 0;
  visibility: hidden;
}

.loader-container {
  text-align: center;
}

.loader-circle {
  position: relative;
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-lg);
  border-radius: var(--radius-full);
  background: var(--bg-secondary);
  overflow: hidden;
}

.circle-gradient {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: var(--gradient-primary);
  animation: spin 2s linear infinite;
}

.circle-gradient::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  background: var(--bg-primary);
  border-radius: var(--radius-full);
}

.loader-text {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

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

/* ===== NAVIGATION ===== */
.modern-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: var(--bg-overlay);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: all var(--transition-normal);
}

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

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  text-decoration: none;
  color: var(--text-primary);
}

.brand-circle {
  width: 40px;
  height: 40px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: white;
  font-size: var(--font-size-lg);
}

.brand-name {
  font-weight: 600;
  font-size: var(--font-size-lg);
  color: var(--text-primary);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--space-xl);
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: var(--font-size-sm);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-color);
  background: rgba(102, 126, 234, 0.1);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border: none;
  background: var(--bg-secondary);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  color: var(--text-secondary);
}

.theme-toggle:hover {
  background: var(--bg-tertiary);
  color: var(--primary-color);
  transform: scale(1.05);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav-toggle span {
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .nav-toggle {
    display: flex;
  }
}

/* ===== HERO SECTION ===== */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: var(--space-3xl) 0;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}

.gradient-orb {
  position: absolute;
  border-radius: var(--radius-full);
  filter: blur(60px);
  opacity: 0.3;
  animation: float 6s ease-in-out infinite;
}

.orb-1 {
  width: 300px;
  height: 300px;
  background: var(--gradient-primary);
  top: 10%;
  left: 10%;
  animation-delay: 0s;
}

.orb-2 {
  width: 400px;
  height: 400px;
  background: var(--gradient-secondary);
  top: 60%;
  right: 10%;
  animation-delay: 2s;
}

.orb-3 {
  width: 200px;
  height: 200px;
  background: var(--gradient-accent);
  bottom: 20%;
  left: 60%;
  animation-delay: 4s;
}

@keyframes float {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(180deg); }
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.hero-content {
  z-index: 2;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  padding: var(--space-sm) var(--space-lg);
  margin-bottom: var(--space-xl);
  box-shadow: var(--shadow-sm);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.badge-icon {
  font-size: var(--font-size-lg);
}

.hero-title {
  margin-bottom: var(--space-xl);
}

.title-line {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--font-size-5xl);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.1;
  margin-bottom: var(--space-sm);
}

.title-subtitle {
  display: block;
  font-size: var(--font-size-2xl);
  font-weight: 500;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-2xl);
  max-width: 500px;
}

.hero-stats {
  display: flex;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--primary-color);
  line-height: 1;
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
  margin-top: var(--space-xs);
}

.hero-actions {
  display: flex;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-lg);
  text-decoration: none;
  font-weight: 600;
  font-size: var(--font-size-base);
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

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

.btn-full {
  width: 100%;
  justify-content: center;
}

/* Hero Visual */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.profile-container {
  position: relative;
  z-index: 2;
}

.profile-image {
  width: 300px;
  height: 300px;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  position: relative;
  box-shadow: var(--shadow-xl);
  background: var(--bg-card);
}

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

.profile-image:hover img {
  transform: scale(1.05);
}

.image-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-normal);
  mix-blend-mode: overlay;
}

.profile-image:hover .image-overlay {
  opacity: 0.2;
}

.floating-elements {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
}

.floating-card {
  position: absolute;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-primary);
  animation: float 4s ease-in-out infinite;
}

.card-1 {
  top: -10px;
  left: -20px;
  color: #f89820;
  animation-delay: 0s;
}

.card-2 {
  top: 20px;
  right: -30px;
  color: #007acc;
  animation-delay: 1s;
}

.card-3 {
  bottom: 60px;
  left: -30px;
  color: #00599c;
  animation-delay: 2s;
}

.card-4 {
  bottom: -10px;
  right: -20px;
  color: #f05032;
  animation-delay: 3s;
}

.scroll-indicator {
  position: absolute;
  bottom: var(--space-2xl);
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  color: var(--text-tertiary);
  font-size: var(--font-size-sm);
}

.scroll-mouse {
  width: 24px;
  height: 40px;
  border: 2px solid var(--text-tertiary);
  border-radius: 12px;
  margin: 0 auto var(--space-md);
  position: relative;
}

.scroll-wheel {
  width: 4px;
  height: 8px;
  background: var(--text-tertiary);
  border-radius: 2px;
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  animation: scroll 2s infinite;
}

@keyframes scroll {
  0% { opacity: 1; top: 8px; }
  100% { opacity: 0; top: 24px; }
}

@media (max-width: 768px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-2xl);
  }
  
  .title-line {
    font-size: var(--font-size-4xl);
  }
  
  .title-subtitle {
    font-size: var(--font-size-xl);
  }
  
  .hero-stats {
    justify-content: center;
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .profile-image {
    width: 250px;
    height: 250px;
  }
}

/* ===== SECTION STYLES ===== */
.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  padding: var(--space-sm) var(--space-lg);
  margin-bottom: var(--space-lg);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
}

.badge-dot {
  width: 8px;
  height: 8px;
  background: var(--primary-color);
  border-radius: var(--radius-full);
}

.section-title {
  font-family: var(--font-heading);
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
  line-height: 1.2;
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

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

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.about-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.about-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

.about-card:hover::before {
  transform: scaleX(1);
}

.about-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl), 0 0 20px rgba(102, 126, 234, 0.15);
  border-color: var(--primary-color);
}

.card-icon {
  margin-bottom: var(--space-lg);
}

.icon-circle {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xl);
  color: white;
  margin-bottom: var(--space-lg);
}

.icon-circle.who { background: var(--gradient-primary); }
.icon-circle.what { background: var(--gradient-secondary); }
.icon-circle.why { background: var(--gradient-accent); }
.icon-circle.where { background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%); }

.card-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.card-description {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-lg);
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tag {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 500;
}

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

.skills-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-3xl);
}

.skills-category {
  text-align: center;
}

.category-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-2xl);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.skill-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  text-align: left;
}

.skill-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl), 0 0 20px rgba(102, 126, 234, 0.15);
  border-color: var(--primary-color);
}

.skill-icon {
  width: 60px;
  height: 60px;
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-2xl);
  color: white;
  margin-bottom: var(--space-lg);
  transition: all var(--transition-normal);
}

/* Specific skill icon colors */
.skill-icon.csharp { background: linear-gradient(135deg, #239120 0%, #68217a 100%); }
.skill-icon.java { background: linear-gradient(135deg, #f89820 0%, #ed8b00 100%); }
.skill-icon.cpp { background: linear-gradient(135deg, #00599c 0%, #004482 100%); }
.skill-icon.python { background: linear-gradient(135deg, #3776ab 0%, #ffd43b 100%); }
.skill-icon.javascript { background: linear-gradient(135deg, #f7df1e 0%, #f0db4f 100%); color: #323330; }
.skill-icon.html { background: linear-gradient(135deg, #e34f26 0%, #1572b6 100%); }
.skill-icon.spring { background: linear-gradient(135deg, #6db33f 0%, #4caf50 100%); }
.skill-icon.dotnet { background: linear-gradient(135deg, #512bd4 0%, #239120 100%); }
.skill-icon.wpf { background: linear-gradient(135deg, #0078d4 0%, #106ebe 100%); }
.skill-icon.sql { background: linear-gradient(135deg, #cc2927 0%, #ff6b35 100%); }
.skill-icon.mysql { background: linear-gradient(135deg, #00758f 0%, #f29111 100%); }
.skill-icon.ef { background: linear-gradient(135deg, #512bd4 0%, #239120 100%); }
.skill-icon.git { background: linear-gradient(135deg, #f05032 0%, #f14e32 100%); }
.skill-icon.vs { background: linear-gradient(135deg, #5c2d91 0%, #007acc 100%); }
.skill-icon.intellij { background: linear-gradient(135deg, #000000 0%, #fe315d 100%); }
.skill-icon.vscode { background: linear-gradient(135deg, #007acc 0%, #0066b2 100%); }
.skill-icon.postman { background: linear-gradient(135deg, #ff6c37 0%, #ff4500 100%); }
.skill-icon.docker { background: linear-gradient(135deg, #0db7ed 0%, #2496ed 100%); }
.skill-icon.oop { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.skill-icon.algorithms { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
.skill-icon.architecture { background: linear-gradient(135deg, #fa709a 0%, #fee140 100%); }
.skill-icon.testing { background: linear-gradient(135deg, #ff9a9e 0%, #fecfef 100%); }
.skill-icon.agile { background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%); }
.skill-icon.api { background: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%); }

.skill-name {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.skill-desc {
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  font-size: var(--font-size-sm);
}

.skill-progress {
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  height: 8px;
  overflow: hidden;
  position: relative;
}

.progress-bar {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  position: relative;
  transition: width 1s ease-in-out;
  width: 0%;
}

.progress-text {
  position: absolute;
  right: var(--space-md);
  top: -30px;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--primary-color);
}

/* ===== TIMELINE SECTION ===== */
.timeline-section {
  padding: var(--space-3xl) 0;
  background: var(--bg-secondary);
}

.timeline-container {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline-line {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border-color);
  transform: translateX(-50%);
}

.timeline-item {
  display: flex;
  margin-bottom: var(--space-3xl);
  position: relative;
}

.timeline-item:nth-child(even) {
  flex-direction: row-reverse;
}

.timeline-marker {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
}

.marker-circle {
  width: 60px;
  height: 60px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: var(--font-size-lg);
  box-shadow: var(--shadow-lg);
}

.timeline-content {
  width: calc(50% - 40px);
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-md);
  position: relative;
}

.timeline-content::before {
  content: '';
  position: absolute;
  top: 30px;
  width: 0;
  height: 0;
  border: 15px solid transparent;
}

.timeline-item:nth-child(odd) .timeline-content::before {
  right: -30px;
  border-left-color: var(--bg-card);
}

.timeline-item:nth-child(even) .timeline-content::before {
  left: -30px;
  border-right-color: var(--bg-card);
}

.timeline-date {
  color: var(--primary-color);
  font-weight: 600;
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-sm);
}

.timeline-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.timeline-description {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-lg);
}

.timeline-skills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.skill-tag {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 500;
}

@media (max-width: 768px) {
  .timeline-line {
    left: 20px;
  }
  
  .timeline-item,
  .timeline-item:nth-child(even) {
    flex-direction: row;
    margin-left: 50px;
  }
  
  .timeline-marker {
    left: 20px;
  }
  
  .timeline-content {
    width: 100%;
  }
  
  .timeline-content::before,
  .timeline-item:nth-child(even) .timeline-content::before {
    left: -30px;
    right: auto;
    border-right-color: var(--bg-card);
    border-left-color: transparent;
  }
}

/* ===== PROJECTS SECTION ===== */
.projects-section {
  padding: var(--space-3xl) 0;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--space-2xl);
}

.project-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.project-card:hover {
  transform: translateY(-12px);
  box-shadow: var(--shadow-xl), 0 0 25px rgba(102, 126, 234, 0.2);
  border-color: var(--primary-color);
}

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

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

.project-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

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

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

.overlay-content {
  display: flex;
  gap: var(--space-lg);
}

.project-link {
  width: 50px;
  height: 50px;
  background: white;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.project-link:hover {
  transform: scale(1.1);
  background: var(--primary-color);
  color: white;
}

.project-content {
  padding: var(--space-2xl);
}

.project-category {
  color: var(--primary-color);
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.project-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

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

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tech-tag {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 500;
}

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

.contact-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.contact-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  transition: all var(--transition-normal);
}

.contact-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl), 0 0 20px rgba(102, 126, 234, 0.15);
  border-color: var(--primary-color);
}

.contact-icon {
  width: 60px;
  height: 60px;
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xl);
  color: white;
  flex-shrink: 0;
}

.contact-details h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.contact-details p {
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.contact-link {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
}

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

.contact-form-container {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-md);
}

.form-header {
  margin-bottom: var(--space-2xl);
}

.form-header h3 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.form-header p {
  color: var(--text-secondary);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.form-group label {
  font-weight: 600;
  color: var(--text-primary);
  font-size: var(--font-size-sm);
}

.form-group input,
.form-group textarea {
  padding: var(--space-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: var(--font-size-base);
  transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

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

@media (max-width: 768px) {
  .contact-container {
    grid-template-columns: 1fr;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
}

/* ===== FOOTER ===== */
.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  margin-bottom: var(--space-2xl);
}

.footer-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.brand-text h3 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.brand-text p {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.footer-description {
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 400px;
}

.footer-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
}

.link-group h4 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
}

.link-group ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.link-group a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.link-group a:hover {
  color: var(--primary-color);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border-color);
}

.footer-bottom p {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.social-links {
  display: flex;
  gap: var(--space-md);
}

.social-links a {
  width: 40px;
  height: 40px;
  background: var(--bg-secondary);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.social-links a:hover {
  background: var(--primary-color);
  color: white;
  transform: translateY(-2px);
}

@media (max-width: 768px) {
  .footer-content {
    grid-template-columns: 1fr;
  }
  
  .footer-links {
    grid-template-columns: 1fr;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: var(--space-lg);
    text-align: center;
  }
}

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

@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

@keyframes zoomIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* AOS Animation Classes */
[data-aos="fade-up"] {
  animation: fadeInUp 0.8s ease-out;
}

[data-aos="fade-left"] {
  animation: fadeInLeft 0.8s ease-out;
}

[data-aos="fade-right"] {
  animation: fadeInRight 0.8s ease-out;
}

[data-aos="zoom-in"] {
  animation: zoomIn 0.8s ease-out;
}

/* Delay classes */
[data-aos-delay="100"] { animation-delay: 0.1s; }
[data-aos-delay="200"] { animation-delay: 0.2s; }
[data-aos-delay="300"] { animation-delay: 0.3s; }
[data-aos-delay="400"] { animation-delay: 0.4s; }
[data-aos-delay="500"] { animation-delay: 0.5s; }

/* ===== RESPONSIVE DESIGN ===== */

/* Extra Large Screens - Desktop */
@media (min-width: 1400px) {
  .container {
    max-width: 1320px;
  }
  
  .hero-container {
    gap: var(--space-3xl);
  }
  
  .profile-image {
    width: 350px;
    height: 350px;
  }
}

/* Large Screens - Laptop */
@media (max-width: 1024px) {
  .container {
    padding: 0 var(--space-lg);
  }
  
  .hero-container {
    gap: var(--space-2xl);
  }
  
  .profile-image {
    width: 280px;
    height: 280px;
  }
  
  .floating-card {
    font-size: var(--font-size-xs);
    padding: var(--space-sm);
  }
}

/* Medium Screens - Tablet */
@media (max-width: 768px) {
  :root {
    --font-size-5xl: 2.5rem;
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.5rem;
    --space-3xl: 3rem;
    --space-2xl: 2rem;
  }
  
  .nav-container {
    padding: var(--space-md);
  }
  
  .nav-links {
    position: fixed;
    top: 70px;
    right: -100%;
    width: 280px;
    height: calc(100vh - 70px);
    background: var(--bg-overlay);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: flex-start;
    align-items: flex-start;
    padding: var(--space-2xl);
    gap: var(--space-lg);
    transition: right var(--transition-normal);
    border-left: 1px solid var(--border-color);
    z-index: 999;
  }
  
  .nav-links.active {
    right: 0;
  }
  
  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  
  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  
  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }
  
  .hero-section {
    padding: var(--space-2xl) 0;
    min-height: auto;
  }
  
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-2xl);
  }
  
  .hero-visual {
    order: -1;
  }
  
  .profile-image {
    width: 250px;
    height: 250px;
  }
  
  .hero-stats {
    gap: var(--space-lg);
    justify-content: center;
  }
  
  .hero-actions {
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
  }
  
  .btn {
    width: 100%;
    max-width: 300px;
    justify-content: center;
  }
  
  .floating-card {
    display: none;
  }
  
  .section-title {
    font-size: var(--font-size-3xl);
  }
  
  .section-subtitle {
    font-size: var(--font-size-base);
  }
  
  .about-grid,
  .skills-grid,
  .projects-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  
  .timeline-line {
    left: 20px;
  }
  
  .timeline-item,
  .timeline-item:nth-child(even) {
    flex-direction: row;
    margin-left: 50px;
  }
  
  .timeline-marker {
    left: 20px;
  }
  
  .timeline-content {
    width: 100%;
  }
  
  .timeline-content::before,
  .timeline-item:nth-child(even) .timeline-content::before {
    left: -30px;
    right: auto;
    border-right-color: var(--bg-card);
    border-left-color: transparent;
  }
  
  .contact-container {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }
  
  .form-row {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
}

/* Small Screens - Mobile */
@media (max-width: 480px) {
  :root {
    --font-size-5xl: 2rem;
    --font-size-4xl: 1.75rem;
    --font-size-3xl: 1.25rem;
    --font-size-2xl: 1.125rem;
    --space-3xl: 2rem;
    --space-2xl: 1.5rem;
    --space-xl: 1.25rem;
  }
  
  .container {
    padding: 0 var(--space-md);
  }
  
  .nav-container {
    padding: var(--space-sm) var(--space-md);
  }
  
  .brand-name {
    display: none;
  }
  
  .nav-links {
    width: 100%;
    right: -100%;
    top: 60px;
    height: calc(100vh - 60px);
    padding: var(--space-xl);
  }
  
  .hero-section {
    padding: var(--space-xl) 0;
  }
  
  .hero-badge,
  .section-badge {
    padding: var(--space-xs) var(--space-md);
    font-size: var(--font-size-xs);
  }
  
  .hero-title .title-line {
    font-size: var(--font-size-4xl);
  }
  
  .hero-title .title-subtitle {
    font-size: var(--font-size-xl);
  }
  
  .hero-description {
    font-size: var(--font-size-base);
  }
  
  .hero-stats {
    gap: var(--space-md);
  }
  
  .stat-number {
    font-size: var(--font-size-2xl);
  }
  
  .profile-image {
    width: 200px;
    height: 200px;
  }
  
  .section-header {
    margin-bottom: var(--space-2xl);
  }
  
  .section-title {
    font-size: var(--font-size-2xl);
  }
  
  .about-card,
  .skill-card,
  .contact-card,
  .contact-form-container,
  .timeline-content {
    padding: var(--space-lg);
  }
  
  .project-content {
    padding: var(--space-lg);
  }
  
  .icon-circle {
    width: 50px;
    height: 50px;
    font-size: var(--font-size-lg);
  }
  
  .skill-icon {
    width: 50px;
    height: 50px;
    font-size: var(--font-size-xl);
  }
  
  .contact-icon {
    width: 50px;
    height: 50px;
    font-size: var(--font-size-lg);
  }
  
  .marker-circle {
    width: 50px;
    height: 50px;
    font-size: var(--font-size-base);
  }
  
  .timeline-item {
    margin-left: 40px;
    margin-bottom: var(--space-2xl);
  }
  
  .timeline-marker {
    left: 15px;
  }
  
  .timeline-line {
    left: 15px;
  }
}

/* Extra Small Screens - Very Small Mobile */
@media (max-width: 360px) {
  :root {
    --font-size-5xl: 1.75rem;
    --font-size-4xl: 1.5rem;
    --space-3xl: 1.5rem;
    --space-2xl: 1.25rem;
  }
  
  .container {
    padding: 0 var(--space-sm);
  }
  
  .hero-title .title-line {
    font-size: var(--font-size-3xl);
  }
  
  .profile-image {
    width: 180px;
    height: 180px;
  }
  
  .hero-stats {
    flex-direction: column;
    gap: var(--space-sm);
  }
  
  .stat-item {
    min-width: 80px;
  }
  
  .about-card,
  .skill-card,
  .contact-card,
  .contact-form-container {
    padding: var(--space-md);
  }
  
  .nav-links {
    padding: var(--space-lg);
  }
}

/* Landscape Mobile */
@media (max-height: 500px) and (orientation: landscape) {
  .hero-section {
    min-height: auto;
    padding: var(--space-lg) 0;
  }
  
  .hero-container {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }
  
  .hero-visual {
    order: 1;
  }
  
  .profile-image {
    width: 200px;
    height: 200px;
  }
  
  .scroll-indicator {
    display: none;
  }
}

/* Print Styles */
@media print {
  .nav-toggle,
  .theme-toggle,
  .scroll-to-top,
  .floating-card,
  .gradient-orb,
  .scroll-indicator {
    display: none !important;
  }
  
  .hero-section,
  .about-section,
  .skills-section,
  .timeline-section,
  .projects-section,
  .contact-section {
    padding: var(--space-lg) 0;
    break-inside: avoid;
  }
  
  .project-card,
  .about-card,
  .skill-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
  }
}

/* ===== SCROLL TO TOP BUTTON ===== */
.scroll-to-top {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  width: 50px;
  height: 50px;
  background: var(--gradient-primary);
  border: none;
  border-radius: var(--radius-full);
  color: white;
  font-size: var(--font-size-lg);
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 1000;
}

.scroll-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.scroll-to-top:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-xl);
}

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

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

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --shadow-sm: none;
    --shadow-md: none;
    --shadow-lg: none;
    --shadow-xl: none;
  }
  
  .about-card,
  .skill-card,
  .project-card,
  .contact-card {
    border-width: 2px;
  }
}