/* ===================================
   Modern Portfolio - Premium Design
   ================================ */

/* CSS Variables */
:root {
  /* Colors */
  --color-primary: #4f46e5;
  --color-primary-light: #818cf8;
  --color-primary-dark: #3730a3;
  --color-secondary: #10b981;
  --color-accent: #f59e0b;
  
  /* Neutrals */
  --color-bg-dark: #0a0a0f;
  --color-bg-medium: #111118;
  --color-bg-light: #1a1a24;
  --color-bg-card: #151520;
  
  /* Text */
  --color-text-primary: #ffffff;
  --color-text-secondary: #a8a8b3;
  --color-text-tertiary: #71717a;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --gradient-text: linear-gradient(135deg, #667eea 0%, #00f2fe 100%);
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Playfair Display', Georgia, serif;
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 16px 64px rgba(0, 0, 0, 0.4);
  
  /* Borders */
  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-light: rgba(255, 255, 255, 0.12);
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Reset & Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-primary);
  background-color: var(--color-bg-dark);
  color: var(--color-text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }

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

a {
  color: var(--color-primary-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

strong {
  font-weight: 600;
  color: var(--color-text-primary);
}

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

/* Section */
.section {
  padding: var(--spacing-3xl) 0;
}

.section.alt {
  background-color: var(--color-bg-medium);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-label {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary-light);
  margin-bottom: var(--spacing-sm);
}

.section-title {
  font-family: var(--font-display);
  margin-bottom: var(--spacing-md);
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 700px;
  margin: 0 auto;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(10, 10, 15, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-base);
}

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

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  transition: color var(--transition-fast);
}

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

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-links a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-base);
}

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

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

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  transition: all var(--transition-base);
}

/* Hero Section */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 50%, rgba(79, 70, 229, 0.15) 0%, transparent 50%),
              radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.15) 0%, transparent 50%);
  z-index: -1;
}

.hero-decorative-image {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 40%;
  height: 60%;
  opacity: 0.08;
  z-index: 0;
  pointer-events: none;
}

.hero-decorative-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 2rem;
  mask-image: linear-gradient(to left, rgba(0,0,0,1) 0%, rgba(0,0,0,0) 100%);
  -webkit-mask-image: linear-gradient(to left, rgba(0,0,0,1) 0%, rgba(0,0,0,0) 100%);
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  align-items: center;
}

.hero-content {
  animation: fadeInUp 0.8s ease-out;
}

.hero-label {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary-light);
  margin-bottom: var(--spacing-md);
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4rem);
  line-height: 1.1;
  margin-bottom: var(--spacing-md);
}

.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

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

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

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.tag {
  font-size: 0.875rem;
  padding: 0.5rem 1rem;
  border-radius: 999px;
  background-color: rgba(79, 70, 229, 0.1);
  border: 1px solid rgba(79, 70, 229, 0.3);
  color: var(--color-text-secondary);
}

/* Hero Visual */
.hero-visual {
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.profile-card {
  background-color: var(--color-bg-card);
  border-radius: 1.5rem;
  padding: var(--spacing-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-xl);
}

.profile-image {
  width: 100%;
  aspect-ratio: 4/5;
  border-radius: 1rem;
  overflow: hidden;
  margin-bottom: var(--spacing-md);
  box-shadow: 0 8px 32px rgba(79, 70, 229, 0.3);
  border: 2px solid rgba(79, 70, 229, 0.2);
}

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

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

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

.info-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.info-label {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-tertiary);
}

.info-value {
  font-size: 1rem;
  color: var(--color-text-primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  border-radius: 0.75rem;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 4px 16px rgba(79, 70, 229, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(79, 70, 229, 0.5);
}

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

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

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

.btn svg {
  width: 20px;
  height: 20px;
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
}

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

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

.stat-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 0.25rem;
}

.stat-label {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

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

.about-card {
  padding: var(--spacing-xl);
  background-color: var(--color-bg-card);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  transition: all var(--transition-base);
}

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

.card-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

.about-card h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
}

.about-card ul {
  list-style: none;
  margin-bottom: var(--spacing-md);
}

.about-card li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
}

.about-card li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-primary-light);
  font-weight: 600;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  color: var(--color-primary-light);
  transition: all var(--transition-fast);
}

.text-link::after {
  content: '→';
  transition: transform var(--transition-fast);
}

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

.text-link:hover::after {
  transform: translateX(4px);
}

/* Inline Links */
.inline-link {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 70, 229, 0.3);
  transition: all 0.2s ease;
}

.inline-link:hover {
  color: var(--color-primary-light);
  border-bottom-color: var(--color-primary-light);
}

.inline-link-light {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  transition: all 0.2s ease;
}

.inline-link-light:hover {
  color: white;
  border-bottom-color: white;
}

/* Projects Grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.projects-preview {
  position: relative;
  overflow: hidden;
}

.projects-bg-image {
  position: absolute;
  left: -10%;
  top: 50%;
  transform: translateY(-50%);
  width: 50%;
  height: 70%;
  opacity: 0.06;
  z-index: 0;
  pointer-events: none;
}

.projects-bg-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 2rem;
  mask-image: linear-gradient(to right, rgba(0,0,0,0) 0%, rgba(0,0,0,1) 50%, rgba(0,0,0,0) 100%);
  -webkit-mask-image: linear-gradient(to right, rgba(0,0,0,0) 0%, rgba(0,0,0,1) 50%, rgba(0,0,0,0) 100%);
}

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

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

.project-card.featured {
  grid-column: span 1;
}

.project-image {
  height: 200px;
  overflow: hidden;
  position: relative;
  background: linear-gradient(135deg, #1a1a24 0%, #2a2a34 100%);
}

.project-image-bg {
  width: 100%;
  height: 100%;
  transition: transform var(--transition-slow);
}

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

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

.project-logo-container {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: var(--spacing-xl);
}

.project-logo {
  max-width: 70%;
  max-height: 140px;
  object-fit: contain;
  filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.3));
  transition: transform var(--transition-base);
}

.project-card:hover .project-logo {
  transform: scale(1.05);
}

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

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: var(--spacing-md);
}

.project-content h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

.project-content p {
  margin-bottom: var(--spacing-md);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  color: var(--color-primary-light);
  transition: all var(--transition-fast);
}

.project-link:hover {
  color: var(--color-primary);
  gap: 0.75rem;
}

.section-cta {
  text-align: center;
  margin-top: var(--spacing-2xl);
}

/* Chess Section */
.chess-section {
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
}

.chess-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-2xl);
  align-items: center;
}

.chess-highlights {
  display: flex;
  gap: var(--spacing-xl);
  margin: var(--spacing-lg) 0;
}

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

.chess-stat strong {
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.25rem;
}

.chess-stat span {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

.chess-lesson {
  padding: var(--spacing-lg);
  background-color: rgba(79, 70, 229, 0.1);
  border-left: 3px solid var(--color-primary);
  border-radius: 0.5rem;
}

.chess-achievements-preview {
  margin: 2rem 0;
  padding: 1.5rem;
  background: rgba(79, 70, 229, 0.08);
  border-radius: 12px;
  border: 1px solid rgba(79, 70, 229, 0.2);
}

.chess-achievements-preview h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--color-primary);
}

.chess-achievements-preview ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.chess-achievements-preview li {
  padding: 0.5rem 0;
  color: var(--color-text);
  font-size: 0.95rem;
  line-height: 1.6;
}

.chess-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.chess-image-container {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  width: 100%;
}

.chess-photo {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.3s ease;
}

.chess-image-container:hover .chess-photo {
  transform: scale(1.05);
}

.chess-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
  padding: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.chess-overlay-text {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: white;
}

.overlay-icon {
  font-size: 2rem;
}

.chess-overlay-text span:last-child {
  font-weight: 600;
  font-size: 1.2rem;
}

.chess-board {
  width: 300px;
  height: 300px;
  background: 
    repeating-linear-gradient(0deg, #3730a3 0px, #3730a3 37.5px, #4f46e5 37.5px, #4f46e5 75px),
    repeating-linear-gradient(90deg, #3730a3 0px, #3730a3 37.5px, #4f46e5 37.5px, #4f46e5 75px);
  border-radius: 1rem;
  box-shadow: var(--shadow-xl);
}

/* CTA Section */
.cta-section {
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.15) 0%, rgba(139, 92, 246, 0.15) 100%);
}

.cta-card {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  padding: var(--spacing-2xl);
  background-color: var(--color-bg-card);
  border: 1px solid var(--border-color-light);
  border-radius: 1.5rem;
  box-shadow: var(--shadow-xl);
}

.cta-card h2 {
  font-family: var(--font-display);
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

.cta-card p {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-xl);
}

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

/* Page Header */
.page-header {
  padding: 120px 0 var(--spacing-3xl);
  text-align: center;
  background: radial-gradient(circle at 50% 30%, rgba(79, 70, 229, 0.15) 0%, transparent 70%);
}

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

.page-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4rem);
  margin-bottom: var(--spacing-md);
}

.page-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
}

/* About Page Specific */
.about-intro-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--spacing-2xl);
  align-items: start;
  margin-bottom: var(--spacing-3xl);
}

.about-bg-visual {
  position: absolute;
  right: -5%;
  top: 20%;
  width: 45%;
  height: 50%;
  opacity: 0.05;
  z-index: 0;
  pointer-events: none;
}

.about-bg-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 2rem;
  mask-image: radial-gradient(ellipse at center, rgba(0,0,0,1) 0%, rgba(0,0,0,0) 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, rgba(0,0,0,1) 0%, rgba(0,0,0,0) 70%);
}

.about-intro-image {
  border-radius: 1rem;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  border: 3px solid rgba(79, 70, 229, 0.2);
  position: relative;
}

.about-intro-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.about-intro-image img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform var(--transition-slow);
}

.about-intro-image:hover img {
  transform: scale(1.03);
}

.about-intro-content h2 {
  font-family: var(--font-display);
  margin-bottom: var(--spacing-md);
}

/* Timeline */
.timeline {
  position: relative;
  padding-left: var(--spacing-xl);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-primary) 0%, transparent 100%);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--spacing-2xl);
}

.timeline-marker {
  position: absolute;
  left: calc(-1 * var(--spacing-xl));
}

.timeline-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--gradient-primary);
  box-shadow: 0 0 0 4px var(--color-bg-medium), 0 0 0 6px var(--color-primary);
  position: relative;
  left: -7px;
}

.timeline-date {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary-light);
  margin-bottom: var(--spacing-sm);
}

.timeline-content h3 {
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
}

.timeline-content h4 {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.timeline-location {
  font-size: 0.9375rem;
  color: var(--color-text-tertiary);
  margin-bottom: var(--spacing-md);
}

.timeline-list {
  list-style: none;
}

.timeline-list li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
}

.timeline-list li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--color-primary-light);
  font-weight: bold;
}

/* Chess Credentials in Timeline */
.chess-credentials {
  display: flex;
  gap: var(--spacing-lg);
  margin: var(--spacing-md) 0;
  flex-wrap: wrap;
}

.chess-id-card {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
  border: 1px solid rgba(79, 70, 229, 0.3);
  border-radius: 0.75rem;
  transition: all var(--transition-base);
}

.chess-id-card:hover {
  transform: translateY(-2px);
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.15) 0%, rgba(139, 92, 246, 0.15) 100%);
  border-color: rgba(79, 70, 229, 0.5);
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.2);
}

.chess-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.chess-id-link {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.chess-id-link:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

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

.skill-category {
  padding: var(--spacing-xl);
  background-color: var(--color-bg-card);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  transition: all var(--transition-base);
}

.skill-category:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-color-light);
}

.skill-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

.skill-category h3 {
  margin-bottom: var(--spacing-md);
}

.skill-category ul {
  list-style: none;
}

.skill-category li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
}

.skill-category li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-secondary);
  font-weight: bold;
}

/* Values Grid */
.values-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
}

.value-card {
  padding: var(--spacing-xl);
  background-color: var(--color-bg-card);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  transition: all var(--transition-base);
}

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

.value-number {
  font-size: 2.5rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-sm);
}

.value-card h3 {
  margin-bottom: var(--spacing-sm);
}

/* Certifications Section */
.certifications-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.certification-card {
  padding: var(--spacing-xl);
  background-color: var(--color-bg-card);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  transition: all var(--transition-base);
}

.certification-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary);
}

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

.cert-icon {
  font-size: 2rem;
}

.cert-provider {
  padding: 0.375rem 0.875rem;
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.1), rgba(139, 92, 246, 0.1));
  border: 1px solid rgba(79, 70, 229, 0.3);
  border-radius: 2rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-primary-light);
}

.certification-card h3 {
  font-size: 1.375rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

.certification-card p {
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.cert-skills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.cert-skill-tag {
  padding: 0.375rem 0.875rem;
  background-color: rgba(79, 70, 229, 0.1);
  border: 1px solid rgba(79, 70, 229, 0.2);
  border-radius: 0.375rem;
  font-size: 0.8125rem;
  color: var(--color-text-primary);
  font-weight: 500;
}

/* Chess About Content */
.chess-about-content {
  max-width: 900px;
}

.chess-lessons {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-xl);
  background-color: var(--color-bg-card);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
}

.chess-lessons h3 {
  margin-bottom: var(--spacing-lg);
}

.lessons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
}

.lesson-item strong {
  display: block;
  color: var(--color-primary-light);
  margin-bottom: 0.25rem;
}

.lesson-item p {
  font-size: 0.9375rem;
  margin-bottom: 0;
}

/* Education Section */
.education-content {
  max-width: 900px;
  margin: 0 auto;
}

.education-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--spacing-xl);
  padding: var(--spacing-2xl);
  background-color: var(--color-bg-card);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  box-shadow: var(--shadow-lg);
}

.education-icon {
  font-size: 4rem;
  text-align: center;
}

.education-details h3 {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}

.education-details h4 {
  font-size: 1.25rem;
  color: var(--color-primary-light);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.education-status {
  font-size: 0.9375rem;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
}

.subjects-section {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
}

.subjects-section h5 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

.subjects-intro {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  line-height: 1.7;
}

.subjects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.subject-item {
  padding: var(--spacing-lg);
  background-color: rgba(79, 70, 229, 0.05);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  transition: all var(--transition-base);
}

.subject-item:hover {
  transform: translateY(-4px);
  background-color: rgba(79, 70, 229, 0.1);
  border-color: var(--border-color-light);
  box-shadow: var(--shadow-md);
}

.subject-icon {
  font-size: 2rem;
  display: block;
  margin-bottom: var(--spacing-sm);
}

.subject-item strong {
  display: block;
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
  color: var(--color-text-primary);
}

.subject-item p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

.education-note {
  padding: var(--spacing-lg);
  background-color: rgba(79, 70, 229, 0.1);
  border-left: 3px solid var(--color-primary);
  border-radius: 0.5rem;
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 0;
}

/* Projects Page Specific */
.project-detail {
  max-width: 900px;
  margin: 0 auto;
}

.project-detail-header {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
  margin-bottom: var(--spacing-2xl);
}

.featured-project .project-detail-header {
  grid-template-columns: 1fr;
}

.project-header-content h2 {
  font-family: var(--font-display);
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.project-tagline {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
}

.project-website-badge {
  margin-top: var(--spacing-md);
}

.website-link {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1.5rem;
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
  border: 1px solid rgba(79, 70, 229, 0.3);
  border-radius: 0.75rem;
  color: var(--color-primary-light);
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-base);
}

.website-link:hover {
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.2) 0%, rgba(139, 92, 246, 0.2) 100%);
  border-color: rgba(79, 70, 229, 0.5);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(79, 70, 229, 0.3);
}

.website-link svg {
  flex-shrink: 0;
}

.badge-status {
  padding: 0.25rem 0.75rem;
  background-color: rgba(245, 158, 11, 0.2);
  border: 1px solid rgba(245, 158, 11, 0.4);
  border-radius: 999px;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent);
}

.project-visual {
  height: 250px;
  border-radius: 1rem;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.project-visual-bg {
  width: 100%;
  height: 100%;
}

.project-logo-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: var(--spacing-xl);
}

.project-detail-logo {
  max-width: 100%;
  max-height: 200px;
  object-fit: contain;
  filter: drop-shadow(0 8px 24px rgba(0, 0, 0, 0.4));
}

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

.project-detail:hover .project-detail-image {
  transform: scale(1.05);
}

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

.project-section h3 {
  margin-bottom: var(--spacing-md);
}

.features-grid,
.how-it-works-grid,
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--spacing-lg);
}

.feature-card,
.step-card,
.research-card {
  padding: var(--spacing-lg);
  background-color: var(--color-bg-card);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  transition: all var(--transition-base);
}

.feature-card:hover,
.step-card:hover,
.research-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-color-light);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
}

.feature-card h4,
.step-card h4,
.research-card h4 {
  margin-bottom: var(--spacing-sm);
}

.feature-card p,
.step-card p,
.research-card p {
  font-size: 0.9375rem;
  margin-bottom: 0;
}

.step-number {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient-primary);
  border-radius: 50%;
  margin-bottom: var(--spacing-md);
}

.learnings-list {
  list-style: none;
}

.learnings-list li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
}

.learnings-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-primary-light);
  font-weight: 600;
}

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

.other-projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
}

.other-project-card {
  padding: var(--spacing-xl);
  background-color: var(--color-bg-card);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  transition: all var(--transition-base);
}

.other-project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-color-light);
}

.other-project-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

.other-project-card h3 {
  margin-bottom: var(--spacing-sm);
}

.other-project-card p {
  margin-bottom: 0;
}

/* Contact Page Specific */
.contact-layout {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: var(--spacing-2xl);
  align-items: start;
}

.contact-form-wrapper h2 {
  font-family: var(--font-display);
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
}

.form-description {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
}

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

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

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

.form-group input,
.form-group select,
.form-group textarea {
  padding: 0.875rem 1rem;
  background-color: var(--color-bg-card);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  color: var(--color-text-primary);
  font-family: var(--font-primary);
  font-size: 1rem;
  transition: all var(--transition-base);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

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

.form-status {
  display: none;
  margin-top: 1rem;
  padding: 1rem;
  border-radius: 0.5rem;
  text-align: center;
}

.form-status .success-message {
  color: var(--color-secondary);
  background: rgba(16, 185, 129, 0.1);
  padding: 1rem;
  border-radius: 0.5rem;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.form-status .error-message {
  color: #ef4444;
  background: rgba(239, 68, 68, 0.1);
  padding: 1rem;
  border-radius: 0.5rem;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.contact-info-wrapper {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.contact-info-card,
.availability-card,
.response-time-card {
  padding: var(--spacing-xl);
  background-color: var(--color-bg-card);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
}

.contact-info-card h3,
.availability-card h3,
.response-time-card h4 {
  margin-bottom: var(--spacing-md);
}

.contact-info-card p,
.availability-card p,
.response-time-card p {
  margin-bottom: var(--spacing-lg);
}

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

.contact-method {
  display: flex;
  gap: var(--spacing-md);
  align-items: start;
}

.method-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  border-radius: 0.75rem;
}

.method-icon svg {
  stroke: white;
}

.method-content h4 {
  margin-bottom: 0.25rem;
}

.method-content a {
  display: block;
  margin-bottom: 0.25rem;
}

.method-note {
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
  margin-bottom: 0;
}

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

.availability-item {
  display: flex;
  gap: var(--spacing-md);
  align-items: start;
}

.availability-icon {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(16, 185, 129, 0.2);
  color: var(--color-secondary);
  border-radius: 50%;
  font-weight: bold;
}

.availability-text strong {
  display: block;
  margin-bottom: 0.25rem;
}

.availability-text p {
  font-size: 0.9375rem;
  margin-bottom: 0;
}

.response-time-card p {
  margin-bottom: 0;
}

/* FAQ Grid */
.faq-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-xl);
}

.faq-item {
  padding: var(--spacing-xl);
  background-color: var(--color-bg-card);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  transition: all var(--transition-base);
}

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

.faq-item h3 {
  color: var(--color-primary-light);
  margin-bottom: var(--spacing-sm);
}

.faq-item p {
  margin-bottom: 0;
}

.final-cta {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.final-cta h2 {
  font-family: var(--font-display);
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

.final-cta p {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-xl);
}

.final-cta-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* Footer */
.footer {
  background-color: var(--color-bg-medium);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-xl);
}

.footer-main h3 {
  margin-bottom: var(--spacing-sm);
}

.footer-main p {
  color: var(--color-text-tertiary);
  margin-bottom: var(--spacing-md);
}

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

.social-links a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg-light);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  transition: all var(--transition-base);
}

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

.social-links a:hover svg {
  stroke: white;
}

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

.footer-column h4 {
  margin-bottom: var(--spacing-md);
  font-size: 1rem;
}

.footer-column a {
  display: block;
  color: var(--color-text-tertiary);
  margin-bottom: var(--spacing-sm);
  transition: color var(--transition-fast);
}

.footer-column a:hover {
  color: var(--color-primary-light);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
}

.footer-bottom p {
  color: var(--color-text-tertiary);
  font-size: 0.9375rem;
  margin-bottom: 0;
}

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

/* Responsive Design */
@media (max-width: 1024px) {
  .hero-container,
  .chess-content,
  .about-intro-grid,
  .project-detail-header {
    grid-template-columns: 1fr;
  }

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

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

@media (max-width: 768px) {
  :root {
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
  }

  .container {
    padding: 0 1.5rem;
  }

  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(10, 10, 15, 0.98);
    backdrop-filter: blur(10px);
    flex-direction: column;
    padding: 2rem;
    gap: 1.5rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    border-bottom: 1px solid var(--border-color);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s;
    z-index: 999;
  }

  .nav-links.active {
    display: flex;
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-links a {
    font-size: 1.125rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .nav-links a:last-child {
    border-bottom: none;
  }

  .mobile-toggle {
    display: flex;
  }

  .hero {
    min-height: auto;
    padding: 100px 0 var(--spacing-2xl);
  }

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

  .hero-lead {
    font-size: 1rem;
  }

  .hero-buttons {
    flex-direction: column;
    gap: 1rem;
  }

  .btn {
    width: 100%;
    justify-content: center;
    padding: 1rem 1.5rem;
  }

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

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }

  .stat-card h3 {
    font-size: 2rem;
  }

  .chess-content {
    gap: 2rem;
  }

  .chess-highlights {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .chess-achievements-preview {
    margin: 1.5rem 0;
  }

  .chess-board {
    width: 200px;
    height: 200px;
  }

  .projects-grid,
  .about-grid,
  .skills-grid,
  .values-grid,
  .certifications-grid,
  .other-projects-grid,
  .faq-grid {
    grid-template-columns: 1fr;
  }

  .project-card,
  .about-card,
  .skill-category,
  .value-card {
    padding: 1.5rem;
  }

  .timeline {
    padding-left: var(--spacing-lg);
  }

  .timeline-content {
    padding: 1.5rem;
  }

  .education-card {
    grid-template-columns: 1fr;
    text-align: center;
    padding: 1.5rem;
  }

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

  .hero-decorative-image,
  .projects-bg-image,
  .about-bg-visual {
    display: none;
  }

  .chess-credentials {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .credential-card {
    width: 100%;
  }

  .contact-layout {
    gap: 2rem;
  }

  .contact-methods {
    gap: 1.5rem;
  }

  .page-header h1 {
    font-size: 2.5rem;
  }

  .cta-card h2 {
    font-size: 2rem;
  }

  .footer-content {
    text-align: center;
  }

  .footer-links {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .project-tags,
  .hero-tags {
    flex-direction: column;
    align-items: flex-start;
  }
}