:root {
  /* Modern Color Palette - Web3/Crypto inspired */
  --primary-color: #0052FF;
  --primary-dark: #0041CC;
  --secondary-color: #1652F0;
  --accent-color: #05B169;
  --gradient-start: #0052FF;
  --gradient-end: #00D4FF;
  
  /* Neutrals */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F6F9FC;
  --bg-dark: #0A0B0D;
  --text-primary: #0A0B0D;
  --text-secondary: #5B616E;
  --text-light: #FFFFFF;
  
  /* Shadows & Effects */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
  --shadow-glow: 0 0 24px rgba(0, 82, 255, 0.2);
  
  /* Borders */
  --border-radius: 12px;
  --border-radius-lg: 16px;
  --border-color: #E7E8EA;
  
  /* Transitions */
  --transition-speed: 0.3s;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Inter", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Navigation */
.navbar {
  background: var(--bg-primary);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-color);
}

.nav-brand i {
  font-size: 1.5rem;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: color var(--transition-speed);
}

.nav-link:hover {
  color: var(--primary-color);
  text-decoration: none;
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
  color: var(--text-light);
  padding: 5rem 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  padding: 0.5rem 1.25rem;
  border-radius: 50px;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 2rem;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.gradient-text {
  background: linear-gradient(135deg, #FFFFFF 0%, #00D4FF 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1.25rem;
  margin-bottom: 2.5rem;
  opacity: 0.95;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}

.hero-cta {
  margin-bottom: 3rem;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 3rem;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 600;
  font-size: 1rem;
}

.stat-item i {
  font-size: 1.5rem;
  opacity: 0.9;
}

/* Buttons */
.cta-button {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 2rem;
  border-radius: var(--border-radius);
  font-weight: 700;
  font-size: 1.125rem;
  text-decoration: none;
  transition: all var(--transition-speed);
  cursor: pointer;
  border: none;
  position: relative;
  overflow: hidden;
}

.cta-button.primary {
  background: var(--bg-primary);
  color: var(--primary-color);
  box-shadow: var(--shadow-md);
}

.cta-button.primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  text-decoration: none;
}

.cta-button.secondary {
  background: var(--primary-color);
  color: var(--text-light);
  box-shadow: var(--shadow-md);
}

.cta-button.secondary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  text-decoration: none;
}

/* Sections */
section {
  padding: 5rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-header h2 {
  font-size: 2.75rem;
  font-weight: 800;
  margin-bottom: 1rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.section-header p {
  font-size: 1.25rem;
  color: var(--text-secondary);
}

/* Features Grid */
.features {
  background: var(--bg-primary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: var(--bg-secondary);
  padding: 2.5rem;
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border-color);
  transition: all var(--transition-speed);
}

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

.feature-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  font-size: 1.75rem;
  color: var(--text-light);
}

.feature-card h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.feature-card p {
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 1rem;
}

/* How It Works */
.how-it-works {
  background: var(--bg-secondary);
}

.steps-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
  max-width: 1000px;
  margin: 0 auto;
}

.step {
  flex: 1;
  min-width: 250px;
  background: var(--bg-primary);
  padding: 2.5rem 2rem;
  border-radius: var(--border-radius-lg);
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 2px solid var(--border-color);
  transition: all var(--transition-speed);
}

.step:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-md);
}

.step-number {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
  color: var(--text-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 800;
  margin: 0 auto 1.5rem;
}

.step-content h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.step-content p {
  color: var(--text-secondary);
  line-height: 1.6;
}

.step-arrow {
  font-size: 2rem;
  color: var(--primary-color);
  opacity: 0.5;
}

/* CTA Section */
.cta-section {
  background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
  color: var(--text-light);
  text-align: center;
  border-radius: var(--border-radius-lg);
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  overflow: hidden;
  margin-bottom: 80px;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 30% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 70% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.cta-content {
  position: relative;
  z-index: 1;
  padding: 0 2rem;
}

.cta-content h2 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.cta-content p {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.95;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* Footer */
.footer {
  background: var(--bg-dark);
  color: var(--text-light);
  padding: 3rem 2rem 2rem;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-section h4 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  color: var(--text-light);
}

.footer-section p {
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.7;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.75rem;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: all var(--transition-speed);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-links a i {
  font-size: 0.875rem;
  color: var(--primary-color);
  transition: transform var(--transition-speed);
}

.footer-links a:hover {
  color: var(--text-light);
  text-decoration: none;
  padding-left: 0.25rem;
}

.footer-links a:hover i {
  transform: translateX(4px);
  color: var(--accent-color);
}

.social-links {
  display: flex;
  gap: 1rem;
}

.social-link {
  width: 48px;
  height: 48px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-light);
  font-size: 1.25rem;
  text-decoration: none;
  transition: all var(--transition-speed);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.social-link:hover {
  background: var(--primary-color);
  transform: translateY(-2px);
  border-color: var(--primary-color);
  text-decoration: none;
}

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
}

.footer-bottom i {
  color: #ff4757;
  margin: 0 0.25rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-container {
    flex-direction: column;
    gap: 1rem;
  }

  .nav-links {
    flex-direction: column;
    gap: 1rem;
  }

  .hero {
    padding: 3rem 1.5rem;
  }

  .hero-title {
    font-size: 2.25rem;
  }

  .hero-description {
    font-size: 1.125rem;
  }

  .hero-stats {
    gap: 1.5rem;
  }

  section {
    padding: 3rem 1.5rem;
  }

  .section-header h2 {
    font-size: 2rem;
  }

  .section-header p {
    font-size: 1.125rem;
  }

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

  .steps-container {
    flex-direction: column;
  }

  .step-arrow {
    transform: rotate(90deg);
  }

  .cta-content h2 {
    font-size: 1.75rem;
  }

  .cta-content p {
    font-size: 1.125rem;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.875rem;
  }

  .cta-button {
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
  }

  .feature-card,
  .step {
    padding: 2rem 1.5rem;
  }
}

/* Legacy styles for other pages */
.card {
  background-color: white;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  padding: 20px;
  margin-bottom: 20px;
}

.card h3 {
  color: var(--text-primary);
  margin-bottom: 15px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
}

.collapsible-trigger {
  cursor: pointer;
  position: relative;
}

.collapsible-trigger::after {
  content: '▼';
  position: absolute;
  right: 0;
  transform: rotate(0deg);
  transition: transform var(--transition-speed) ease;
}

.collapsible-trigger.active::after {
  transform: rotate(180deg);
}

.collapsible-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-speed) ease;
}

.collapsible-content.active {
  max-height: 1000px;
}

pre {
  background-color: var(--bg-secondary);
  padding: 15px;
  border-radius: var(--border-radius);
  overflow-x: auto;
  margin: 15px 0;
}

code {
  font-family: 'Courier New', Courier, monospace;
}

.copy-btn {
  position: absolute;
  top: 5px;
  right: 5px;
  background-color: var(--text-primary);
  color: white;
  border: none;
  border-radius: 4px;
  padding: 5px 10px;
  cursor: pointer;
  font-size: 0.8rem;
}

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

ul, ol {
  margin-left: 20px;
  margin-bottom: 15px;
}

li {
  margin-bottom: 8px;
}

.note {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-style: italic;
}

.video-container {
  position: relative;
  width: 100%;
  max-width: 800px;
  height: 450px;
  margin: 0 auto;
  background: #000;
}

#youtube-player {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.video-info {
  margin-top: 20px;
  padding-top: 15px;
  border-top: 1px solid var(--border-color);
}

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

.hero-content > * {
  animation: fadeInUp 0.6s ease-out;
}