/* MODERN PROFESSIONAL DESIGN SYSTEM - 2025 */

:root {
  /* Primary Brand Colors - Modern Blue Palette */
  --primary-color: #0f1419;
  --primary-dark: #000000;
  --primary-light: #1e293b;
  --secondary-color: #64748b;
  --accent-color: #3b82f6;
  --accent-dark: #2563eb;
  --accent-light: #60a5fa;

  /* Status Colors - Professional Palette */
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
  --info-color: #06b6d4;

  /* Text Colors - Enhanced Readability */
  --text-primary: #0f1419;
  --text-secondary: #374151;
  --text-muted: #6b7280;
  --text-light: #9ca3af;
  --text-white: #ffffff;
  --text-inverse: #f9fafb;

  /* Background Colors - Clean & Modern */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-muted: #f1f5f9;
  --bg-dark: #0f1419;
  --bg-darker: #000000;
  --bg-accent: #f0f9ff;

  /* Gradient Backgrounds - Subtle & Professional */
  --bg-gradient: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 50%, #cbd5e1 100%);
  --bg-gradient-hero: linear-gradient(135deg, #0f1419 0%, #1e293b 50%, #374151 100%);
  --bg-gradient-card: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);

  /* Border & Surface */
  --border-color: #e5e7eb;
  --border-light: #f3f4f6;
  --border-dark: #d1d5db;
  --border-radius: 12px;
  --border-radius-lg: 16px;
  --border-radius-xl: 20px;
  --border-radius-full: 9999px;

  /* Shadows - Modern & Subtle */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);

  /* Transitions - Smooth & Modern */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);

  /* Typography - Modern & Readable */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;

  /* Spacing - Consistent Scale */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Z-Index Scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-toast: 1080;

  /* Enhanced Professional Color Palette from Portfolio */
  --primary-50: #f0f9ff;
  --primary-100: #e0f2fe;
  --primary-200: #bae6fd;
  --primary-300: #7dd3fc;
  --primary-400: #38bdf8;
  --primary-500: #0ea5e9;
  --primary-600: #0284c7;
  --primary-700: #0369a1;
  --primary-800: #075985;
  --primary-900: #0c4a6e;

  /* Professional Gray Scale */
  --gray-50: #fafafa;
  --gray-100: #f4f4f5;
  --gray-200: #e4e4e7;
  --gray-300: #d4d4d8;
  --gray-400: #a1a1aa;
  --gray-500: #71717a;
  --gray-600: #52525b;
  --gray-700: #3f3f46;
  --gray-800: #27272a;
  --gray-900: #18181b;

  /* Accent Colors */
  --accent-emerald: #10b981;
  --accent-indigo: #6366f1;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;

  /* Enhanced Spacing Scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Enhanced Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-3xl: 2rem;
  --radius-full: 9999px;

  /* Enhanced Shadows */
  --shadow-glow: 0 0 20px rgb(14 165 233 / 0.3);
}

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

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  font-weight: 400;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  -webkit-text-size-adjust: 100%;
}

/* MODERN TYPOGRAPHY SYSTEM */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--space-lg);
  letter-spacing: -0.025em;
  color: var(--text-primary);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.1;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

h4 {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
  font-weight: 600;
  line-height: 1.25;
}

h5 {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.3;
}

h6 {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
}

p {
  margin-bottom: var(--space-lg);
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 1rem;
}

.section-description {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto var(--space-3xl);
  line-height: 1.6;
  font-weight: 400;
}

/* Lead text for better hierarchy */
.lead {
  font-size: 1.25rem;
  line-height: 1.6;
  color: var(--text-secondary);
  font-weight: 400;
  margin-bottom: var(--space-xl);
}

/* Small text for metadata */
.small {
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--text-muted);
  font-weight: 500;
}

/* MODERN NAVIGATION */
.main-navigation {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--gray-200);
  z-index: var(--z-fixed);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.main-navigation.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  transition: var(--transition);
  letter-spacing: -0.02em;
}

.nav-logo:hover {
  color: var(--accent-color);
  transform: scale(1.02);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--space-xl);
  align-items: center;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: all var(--transition-fast);
  position: relative;
  padding: var(--space-sm) 0;
  letter-spacing: 0.01em;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-color), var(--accent-light));
  transition: var(--transition);
  border-radius: var(--border-radius-full);
}

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

.cta-button {
  background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
  color: var(--text-white);
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--border-radius-full);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
  border: 2px solid transparent;
  letter-spacing: 0.01em;
  position: relative;
  overflow: hidden;
}

.cta-button::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-normal);
}

.cta-button:hover::before {
  left: 100%;
}

.cta-button:hover {
  background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.cta-button:active {
  transform: translateY(0);
}

/* Mobile Navigation */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  border-radius: var(--border-radius);
}

.mobile-menu-btn span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: var(--transition);
  border-radius: 1px;
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

/* MODERN HERO SECTION */
.hero-section {
  padding: 140px 0 100px;
  background: var(--bg-gradient-hero);
  color: var(--text-white);
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="white" opacity="0.03"/><circle cx="75" cy="75" r="1" fill="white" opacity="0.03"/><circle cx="50" cy="10" r="0.5" fill="white" opacity="0.02"/><circle cx="10" cy="50" r="0.5" fill="white" opacity="0.02"/><circle cx="90" cy="30" r="0.5" fill="white" opacity="0.02"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
  pointer-events: none;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--border-radius-xl);
  padding: var(--space-sm) var(--space-lg);
  margin-bottom: var(--space-xl);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.025em;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  margin-bottom: var(--space-lg);
  line-height: 1.1;
  letter-spacing: -0.04em;
  color: var(--text-white);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--space-3xl);
  line-height: 1.6;
  font-weight: 400;
}

.hero-actions {
  display: flex;
  gap: var(--space-lg);
  flex-wrap: wrap;
  margin-bottom: var(--space-3xl);
}

.btn-primary, .btn-secondary {
  padding: var(--space-lg) var(--space-2xl);
  border-radius: var(--border-radius-xl);
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--text-white);
  color: var(--text-primary);
  box-shadow: var(--shadow-xl);
  border: 2px solid var(--text-white);
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.1), transparent);
  transition: var(--transition);
}

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

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2xl);
  background: rgba(255, 255, 255, 0.95);
}

.btn-secondary {
  background: transparent;
  color: var(--text-white);
  border: 2px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
  transform: translateY(-2px);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  margin-top: var(--space-3xl);
}

.stat-item {
  text-align: center;
  padding: var(--space-lg);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border-radius: var(--border-radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  display: block;
  margin-bottom: var(--space-sm);
  color: var(--text-white);
}

.stat-label {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.8);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.hero-visual {
  position: relative;
}

.hero-illustration {
  filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.1));
}

.hero-illustration svg {
  width: 100%;
  height: auto;
  max-width: 400px;
}

/* Floating Elements from Portfolio */
.floating-elements {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.floating-element {
  position: absolute;
  width: 60px;
  height: 60px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-400);
  font-size: 1.5rem;
  animation: float 4s ease-in-out infinite;
}

.floating-element:nth-child(1) {
  top: 20%;
  left: 10%;
  animation-delay: 0s;
}

.floating-element:nth-child(2) {
  top: 60%;
  left: 5%;
  animation-delay: 1s;
}

.floating-element:nth-child(3) {
  top: 30%;
  right: 10%;
  animation-delay: 2s;
}

.floating-element:nth-child(4) {
  bottom: 20%;
  right: 5%;
  animation-delay: 3s;
}

.floating-element:nth-child(5) {
  top: 70%;
  right: 15%;
  animation-delay: 4s;
}

.scroll-indicator {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  animation: bounce 2s infinite;
}

.scroll-mouse {
  width: 24px;
  height: 36px;
  border: 2px solid var(--primary-400);
  border-radius: 12px;
  margin: 0 auto var(--space-2);
  position: relative;
}

.scroll-wheel {
  width: 4px;
  height: 8px;
  background: var(--primary-400);
  border-radius: 2px;
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  animation: scroll 2s infinite;
}

.scroll-text {
  color: var(--primary-600);
  font-size: 0.875rem;
  font-weight: 500;
}

/* Animations */
@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-10px);
  }
}

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

@keyframes scroll {
  0% {
    opacity: 0;
    transform: translateX(-50%) translateY(0);
  }
  50% {
    opacity: 1;
    transform: translateX(-50%) translateY(6px);
  }
  100% {
    opacity: 0;
    transform: translateX(-50%) translateY(12px);
  }
}

/* MODERN CONTENT SECTIONS */
.main-content {
  padding: var(--space-4xl) 0;
}

.content-section {
  padding: var(--space-4xl) 0;
  background: var(--bg-secondary);
}

.content-section:nth-child(even) {
  background: var(--bg-primary);
}

.section-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-4xl);
}

.section-header h2 {
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
}

.section-description {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto var(--space-3xl);
  line-height: 1.6;
  font-weight: 400;
}

/* MODERN FEATURE CARDS */
.section-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-3xl);
}

.feature-card {
  background: var(--bg-primary);
  padding: var(--space-2xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  transition: all var(--transition-normal);
  cursor: pointer;
  border: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-color), var(--accent-light));
  transform: scaleX(0);
  transition: var(--transition);
}

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

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

.card-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-lg);
  display: block;
  color: var(--accent-color);
}

.feature-card h3 {
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  font-size: 1.25rem;
  font-weight: 600;
}

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

.card-action {
  color: var(--accent-color);
  font-weight: 600;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.card-action::after {
  content: '→';
  transition: var(--transition);
}

.feature-card:hover .card-action::after {
  transform: translateX(4px);
}

/* Enhanced Skill Progress Bars from Portfolio */
.skill-section {
  background: var(--bg-secondary);
  padding: var(--space-4xl) 0;
}

.skill-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.skill-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-3xl);
}

.skill-card {
  background: var(--bg-primary);
  padding: var(--space-2xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

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

.skill-card h3 {
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
  font-size: 1.25rem;
  font-weight: 600;
}

.skill-item {
  margin-bottom: var(--space-lg);
}

.skill-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-sm);
}

.skill-name {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.skill-percentage {
  font-weight: 700;
  color: var(--accent-color);
  font-size: 0.875rem;
}

.skill-bar {
  height: 8px;
  background: var(--bg-muted);
  border-radius: var(--border-radius-full);
  overflow: hidden;
  position: relative;
  box-shadow: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);
}

.skill-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-color), var(--accent-light));
  border-radius: var(--border-radius-full);
  transition: width 1.5s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.skill-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.2), transparent);
  border-radius: var(--border-radius-full);
}

/* METRIC CARDS */
.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-2xl);
  margin-bottom: var(--space-3xl);
}

.metric-card {
  background: var(--bg-primary);
  padding: var(--space-2xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid var(--border-color);
}

.metric-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-color);
}

.metric-value {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent-color);
  margin-bottom: 0.5rem;
  display: block;
}

.metric-label {
  color: var(--text-primary);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.metric-trend {
  color: var(--success-color);
  font-size: 0.875rem;
  font-weight: 500;
}

/* MATH VISUALIZATIONS */
.math-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-2xl);
  margin-bottom: var(--space-3xl);
}

.math-visualization {
  background: var(--bg-primary);
  padding: var(--space-2xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid var(--border-color);
}

.math-visualization:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-color);
}

.math-visualization h3 {
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
}

.math-visualization p {
  color: var(--text-secondary);
}

/* EMOTIONAL INTELLIGENCE */
.eq-dashboard {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
  margin-bottom: var(--space-3xl);
}

.emotion-wheel-container {
  display: flex;
  justify-content: center;
  cursor: pointer;
}

.emotion-wheel {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: conic-gradient(
    #f39c12 0deg 45deg,
    #27ae60 45deg 90deg,
    #e74c3c 90deg 135deg,
    #9b59b6 135deg 180deg,
    #3498db 180deg 225deg,
    #95a5a6 225deg 270deg,
    #e67e22 270deg 315deg,
    #1abc9c 315deg 360deg
  );
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
}

.emotion-wheel:hover {
  transform: scale(1.05);
}

.emotion-center {
  background: var(--bg-primary);
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--accent-color);
  box-shadow: var(--shadow);
}

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

.emotion-metric {
  cursor: pointer;
}

.emotion-label {
  display: block;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.emotion-bar {
  height: 8px;
  background: var(--bg-muted);
  border-radius: 4px;
  overflow: hidden;
}

.emotion-fill {
  height: 100%;
  border-radius: 4px;
  transition: width 1s ease-in-out;
}

.emotion-fill.empathy { background: #f39c12; width: 87%; }
.emotion-fill.wisdom { background: #27ae60; width: 89%; }
.emotion-fill.innovation { background: #9b59b6; width: 95%; }

/* PHILOSOPHY GRID */
.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--space-2xl);
  margin-bottom: var(--space-3xl);
}

.philosophical-concept {
  background: var(--bg-primary);
  padding: var(--space-2xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid var(--border-color);
}

.philosophical-concept:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-color);
}

.philosophical-concept h3 {
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
}

.philosophical-concept p {
  color: var(--text-secondary);
}

/* NEXUS CONTROLS */
.nexus-controls {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
  flex-wrap: wrap;
}

.nexus-btn {
  background: var(--bg-primary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
  font-weight: 500;
}

.nexus-btn.active,
.nexus-btn:hover {
  background: var(--accent-color);
  color: var(--text-white);
  border-color: var(--accent-color);
}

.nexus-visualization {
  height: 400px;
  background: var(--bg-muted);
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-2xl);
}

/* SECTION CTA */
.section-cta {
  text-align: center;
}

.section-cta .btn-primary {
  background: var(--accent-color);
  color: var(--text-white);
}

/* Enhanced Footer from Portfolio */
.site-footer {
  background: linear-gradient(135deg, var(--gray-800) 0%, var(--gray-900) 100%);
  color: var(--text-white);
  padding: var(--space-4xl) 0 var(--space-2xl);
  border-top: 1px solid var(--border-color);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-2xl);
}

.footer-section h4 {
  color: var(--text-white);
  margin-bottom: var(--space-lg);
  font-size: 1.125rem;
  font-weight: 600;
}

.footer-section p {
  color: var(--text-muted);
  margin-bottom: var(--space-lg);
  line-height: 1.6;
}

.footer-section ul {
  list-style: none;
  padding: 0;
}

.footer-section ul li {
  margin-bottom: var(--space-sm);
}

.footer-section ul a {
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
  font-size: 0.875rem;
}

.footer-section ul a:hover {
  color: var(--accent-color);
}

.footer-social {
  display: flex;
  gap: var(--space-lg);
  margin-top: var(--space-lg);
}

.social-link {
  width: 40px;
  height: 40px;
  background: var(--gray-700);
  color: var(--text-white);
  border-radius: var(--border-radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: var(--transition);
  font-size: 1.125rem;
}

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

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

.footer-bottom p {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin: 0;
}

.footer-bottom a {
  color: var(--accent-color);
  text-decoration: none;
  font-weight: 600;
}

.footer-bottom a:hover {
  text-decoration: underline;
}

/* MODERN MODAL SYSTEM */
.topic-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(5px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: modalFadeIn 0.2s ease-out;
}

.modal-content {
  background: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  padding: 0;
  max-width: 500px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--border-color);
}

.modal-header {
  padding: var(--space-2xl) var(--space-2xl) var(--space-lg);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h3 {
  color: var(--text-primary);
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  padding: var(--space-sm);
  border-radius: var(--border-radius);
  transition: var(--transition);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close:hover {
  background: var(--bg-muted);
  color: var(--text-primary);
}

.modal-body {
  padding: var(--space-2xl);
}

.modal-body p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.6;
  margin-bottom: var(--space-2xl);
}

.modal-actions {
  display: flex;
  gap: var(--space-lg);
  justify-content: flex-end;
  padding: 0 var(--space-2xl) var(--space-2xl);
}

.modal-actions .btn-primary {
  background: var(--accent-color);
  color: var(--text-white);
  border: none;
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--border-radius);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.modal-actions .btn-primary:hover {
  background: var(--accent-dark);
  transform: translateY(-1px);
}

.modal-actions .btn-secondary {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--border-radius);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.modal-actions .btn-secondary:hover {
  background: var(--bg-muted);
}

/* ANIMATIONS */
@keyframes modalFadeIn {
  from {
    opacity: 0;
    backdrop-filter: blur(0px);
  }
  to {
    opacity: 1;
    backdrop-filter: blur(5px);
  }
}

/* MODERN EDUCATIONAL VISUALIZATIONS */
.educational-visualization {
  background: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  padding: var(--space-2xl);
  margin: var(--space-2xl) 0;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
}

.educational-visualization h3 {
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  text-align: center;
}

.educational-visualization p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  text-align: center;
  margin-bottom: var(--space-xl);
}

.visualization-container {
  width: 100%;
  height: 300px;
  background: var(--bg-muted);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

/* MODERN EDUCATIONAL TOOLTIPS */
.educational-tooltip {
  position: fixed;
  background: rgba(0, 0, 0, 0.9);
  color: white;
  padding: var(--space-lg) var(--space-xl);
  border-radius: var(--border-radius);
  font-size: 0.875rem;
  max-width: 250px;
  z-index: 1000;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--border-color);
}

.educational-tooltip h4 {
  margin: 0 0 var(--space-sm) 0;
  color: var(--accent-color);
  font-size: 1rem;
}

.educational-tooltip button {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-sm);
  background: none;
  border: none;
  color: white;
  cursor: pointer;
  font-size: 1rem;
  padding: 0;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: var(--transition);
}

.educational-tooltip button:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* RESPONSIVE DESIGN */
@media (max-width: 768px) {
  .nav-container {
    padding: 0 var(--space-lg);
    height: 60px;
  }

  .nav-menu {
    display: none;
  }

  .hero-container {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
    text-align: center;
    padding: 0 var(--space-lg);
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .learning-stats {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .section-container {
    padding: 0 var(--space-lg);
  }

  .section-grid,
  .metric-grid,
  .math-grid {
    grid-template-columns: 1fr;
  }

  .eq-dashboard {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

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

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

  .storytelling-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .story-card {
    padding: var(--space-xl);
  }

  .storytelling-section .visualization-container {
    height: 300px;
  }

  /* Testimonials responsive */
  .testimonial-card {
    margin: 0 var(--space-md);
    padding: var(--space-xl);
  }

  .testimonial-quote {
    font-size: 1rem;
  }

  .testimonial-author {
    flex-direction: column;
    text-align: center;
    gap: var(--space-sm);
  }

  /* Contact section responsive */
  .contact-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .contact-item {
    padding: var(--space-xl);
  }

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

  .contact-title {
    font-size: 1.125rem;
  }

  /* Back to top button responsive */
  .back-to-top {
    bottom: var(--space-4);
    right: var(--space-4);
    width: 48px;
    height: 48px;
    font-size: 1.125rem;
  }

  /* Scroll progress bar responsive */
  .scroll-progress {
    height: 3px;
  }
}

@media (max-width: 480px) {
  .hero-section {
    padding: 100px 0 60px;
  }

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

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

  .btn-primary,
  .btn-secondary {
    width: 100%;
    text-align: center;
  }

  .modal-content {
    width: 95%;
    margin: var(--space-lg);
  }

  .modal-header,
  .modal-body,
  .modal-actions {
    padding-left: var(--space-xl);
    padding-right: var(--space-xl);
  }

  .modal-actions {
    flex-direction: column;
  }

  .modal-actions .btn-primary,
  .modal-actions .btn-secondary {
    width: 100%;
  }

  .storytelling-section {
    padding: 60px 0;
  }

  .story-card {
    padding: var(--space-lg);
  }

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

  .storytelling-section .visualization-container {
    height: 250px;
  }

  /* Mobile responsive for testimonials */
  .testimonial-card {
    margin: 0 var(--space-sm);
    padding: var(--space-lg);
  }

  .testimonial-quote {
    font-size: 0.875rem;
  }

  .author-avatar {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }

  .author-info h4 {
    font-size: 0.875rem;
  }

  .author-info p {
    font-size: 0.75rem;
  }

  /* Mobile responsive for contact section */
  .contact-item {
    padding: var(--space-lg);
  }

  .contact-icon {
    font-size: 1.75rem;
  }

  .contact-title {
    font-size: 1rem;
  }

  .contact-link {
    font-size: 0.875rem;
  }

  .contact-description {
    font-size: 0.75rem;
  }

  /* Mobile responsive for back to top button */
  .back-to-top {
    bottom: var(--space-3);
    right: var(--space-3);
    width: 44px;
    height: 44px;
    font-size: 1rem;
  }

  /* Mobile responsive for scroll progress bar */
  .scroll-progress {
    height: 2px;
  }
}

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

/* FOCUS STYLES */
.nav-link:focus,
.cta-button:focus,
.btn-primary:focus,
.btn-secondary:focus,
.feature-card:focus,
.metric-card:focus,
.math-visualization:focus,
.philosophical-concept:focus,
.nexus-btn:focus,
.modal-close:focus {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

/* STORYTELLING SECTION STYLES */
.storytelling-section {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-muted) 100%);
  padding: var(--space-4xl) 0;
}

.storytelling-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-2xl);
  margin-bottom: var(--space-3xl);
}

.story-card {
  background: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  padding: var(--space-2xl);
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
  transition: var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

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

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

.story-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-lg);
  display: block;
  color: var(--accent-color);
}

.story-card h3 {
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  font-size: 1.25rem;
}

.story-card p {
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
  line-height: 1.6;
}

.story-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.tag {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  padding: var(--space-xs) var(--space-md);
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px solid var(--border-color);
}

.card-action {
  color: var(--accent-color);
  font-weight: 600;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: var(--transition);
}

.story-card:hover .card-action {
  color: var(--accent-dark);
}

/* Specific story card themes */
.journey-card::before {
  background: linear-gradient(90deg, var(--accent-color), var(--accent-light));
}

.pipeline-card::before {
  background: linear-gradient(90deg, var(--success-color), var(--accent-color));
}

.ethics-card::before {
  background: linear-gradient(90deg, var(--warning-color), var(--accent-color));
}

.geospatial-card::before {
  background: linear-gradient(90deg, var(--info-color), var(--accent-color));
}

/* Enhanced educational visualizations for storytelling */
.storytelling-section .educational-visualization {
  background: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  padding: var(--space-2xl);
  margin: var(--space-2xl) 0;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
}

.storytelling-section .educational-visualization h3 {
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  font-size: 1.5rem;
}

.storytelling-section .educational-visualization p {
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

.storytelling-section .visualization-container {
  height: 400px;
  border-radius: var(--border-radius);
  overflow: hidden;
  background: var(--bg-dark);
  position: relative;
}

/* Responsive storytelling */
@media (max-width: 768px) {
  .storytelling-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .story-card {
    padding: var(--space-xl);
  }

  .storytelling-section .visualization-container {
    height: 300px;
  }
}

@media (max-width: 480px) {
  .storytelling-section {
    padding: 60px 0;
  }

  .story-card {
    padding: var(--space-lg);
  }

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

  .storytelling-section .visualization-container {
    height: 250px;
  }
}

/* Scroll Progress Bar from Portfolio */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gray-200);
  z-index: var(--z-fixed);
}

.scroll-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-500), var(--accent-indigo));
  width: 0%;
  transition: width var(--transition-fast);
}

/* Back to Top Button from Portfolio */
.back-to-top {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
  color: white;
  border: none;
  border-radius: var(--border-radius-full);
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  transition: all var(--transition-normal);
  z-index: var(--z-fixed);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  opacity: 0;
  visibility: hidden;
}

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

.back-to-top:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
  background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
}

.back-to-top:active {
  transform: translateY(0);
}

/* MODERN TESTIMONIALS */
.testimonials-section {
  padding: var(--space-4xl) 0;
  background: var(--bg-primary);
}

.testimonials-container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.testimonial-slider {
  position: relative;
  overflow: hidden;
}

.testimonial-card {
  background: var(--bg-primary);
  padding: var(--space-3xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
  text-align: center;
  margin: 0 var(--space-lg);
}

.testimonial-quote {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-xl);
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
}

.author-avatar {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--accent-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
  font-size: 1.25rem;
}

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

.author-info p {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin: 0;
}

/* Enhanced Contact Section from Portfolio */
.contact-section {
  background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
  padding: var(--space-4xl) 0;
}

.contact-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-3xl);
}

.contact-item {
  background: var(--bg-primary);
  padding: var(--space-2xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
  transition: all var(--transition-normal);
  cursor: pointer;
  text-align: center;
}

.contact-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--accent-color);
}

.contact-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-lg);
  display: block;
  color: var(--accent-color);
  transition: var(--transition);
}

.contact-item:hover .contact-icon {
  color: var(--accent-dark);
  transform: scale(1.1);
}

.contact-title {
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  font-size: 1.25rem;
  font-weight: 600;
}

.contact-link {
  color: var(--accent-color);
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition);
  display: block;
  margin-bottom: var(--space-sm);
}

.contact-link:hover {
  color: var(--accent-dark);
  text-decoration: underline;
}

.contact-description {
  color: var(--text-muted);
  font-size: 0.875rem;
  line-height: 1.5;
}

.contact-cta {
  text-align: center;
  margin-top: var(--space-3xl);
}

.contact-cta .btn-primary {
  background: var(--accent-color);
  color: var(--text-white);
  padding: var(--space-lg) var(--space-2xl);
  border-radius: var(--border-radius-lg);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.125rem;
  transition: var(--transition);
  box-shadow: var(--shadow-lg);
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
}

.contact-cta .btn-primary:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}