/* CSS Variables */
:root {
  /* Colors */
  --primary-gradient: linear-gradient(135deg, #9333ea 0%, #3b82f6 100%);
  --primary-purple: #9333ea;
  --primary-blue: #3b82f6;
  --accent-orange: #f59e0b;
  
  /* Light theme */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #64748b;
  --border-color: #e2e8f0;
  --card-bg: #ffffff;
  --card-border: #e2e8f0;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Border radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px 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);
}

/* Dark theme */
[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-tertiary: #94a3b8;
  --border-color: #334155;
  --card-bg: #1e293b;
  --card-border: #334155;
}

/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

[data-theme="dark"] .navbar {
  background: rgba(15, 23, 42, 0.8);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

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

.nav-logo {
  width: 32px;
  height: 32px;
}

.nav-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
}

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

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
}

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

.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-sm);
  cursor: pointer;
  font-size: var(--font-size-lg);
  transition: all 0.3s ease;
}

.theme-toggle:hover {
  background: var(--bg-secondary);
}

/* Hero Section */
.hero {
  padding: 120px 0 80px;
  background: var(--bg-primary);
  overflow: hidden;
}

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

.hero-content {
  max-width: 600px;
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: var(--spacing-lg);
  color: var(--text-primary);
}

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

.hero-description {
  font-size: var(--font-size-xl);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  line-height: 1.6;
}

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

.stat {
  text-align: center;
}

.stat-number {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--primary-purple);
  display: block;
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
  font-weight: 500;
}

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

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

.app-preview {
  position: relative;
  max-width: 500px;
}

.app-screenshot {
  width: 100%;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
}

.floating-card {
  position: absolute;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  box-shadow: var(--shadow-lg);
  animation: float 3s ease-in-out infinite;
}

.card-1 {
  top: 20%;
  left: -20%;
  animation-delay: 0s;
}

.card-2 {
  top: 60%;
  right: -20%;
  animation-delay: 1s;
}

.card-3 {
  bottom: 20%;
  left: -10%;
  animation-delay: 2s;
}

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

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

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-lg);
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s ease;
  cursor: pointer;
  border: none;
  font-size: var(--font-size-base);
}

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

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

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

.btn-secondary:hover {
  background: var(--bg-tertiary);
}

.btn-large {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: var(--font-size-lg);
  flex-direction: column;
  gap: var(--spacing-xs);
}

.btn-subtitle {
  font-size: var(--font-size-sm);
  opacity: 0.8;
  font-weight: 400;
}

/* Contextual Highlight Section */
.contextual-highlight {
  padding: 100px 0;
  background: linear-gradient(135deg, var(--primary-purple) 0%, var(--primary-blue) 100%);
  color: white;
  position: relative;
  overflow: hidden;
}

.contextual-highlight::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg width="60" height="60" viewBox="0 0 60 60" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd"><g fill="%23ffffff" fill-opacity="0.05"><circle cx="30" cy="30" r="1"/></g></svg>');
  animation: float 20s ease-in-out infinite;
}

.contextual-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.contextual-badge {
  display: inline-block;
  background: rgba(255, 255, 255, 0.2);
  color: white;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: 24px;
  backdrop-filter: blur(10px);
}

.contextual-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  margin-bottom: 24px;
  line-height: 1.2;
}

.contextual-description {
  font-size: var(--font-size-lg);
  margin-bottom: 48px;
  opacity: 0.95;
  line-height: 1.6;
}

.contextual-features {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.contextual-feature {
  display: flex;
  align-items: flex-start;
  gap: 20px;
}

.contextual-feature .feature-icon {
  font-size: 32px;
  min-width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 12px;
  backdrop-filter: blur(10px);
}

.contextual-feature .feature-content h4 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: 8px;
  color: white;
}

.contextual-feature .feature-content p {
  font-size: var(--font-size-base);
  opacity: 0.9;
  line-height: 1.5;
}

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

.tree-preview {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  padding: 32px;
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  max-width: 400px;
  width: 100%;
}

.tree-node {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  font-size: var(--font-size-base);
  font-weight: 500;
}

.tree-node.root {
  font-size: var(--font-size-lg);
  font-weight: 600;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  margin-bottom: 16px;
  padding-bottom: 16px;
}

.tree-children {
  margin-left: 24px;
  border-left: 2px solid rgba(255, 255, 255, 0.2);
  padding-left: 24px;
}

.tree-children .tree-node {
  position: relative;
}

.tree-children .tree-node::before {
  content: '';
  position: absolute;
  left: -24px;
  top: 20px;
  width: 16px;
  height: 1px;
  background: rgba(255, 255, 255, 0.2);
}

.node-icon {
  font-size: 20px;
  min-width: 24px;
}

.node-name {
  flex: 1;
}

.node-count {
  font-size: var(--font-size-sm);
  opacity: 0.8;
  background: rgba(255, 255, 255, 0.15);
  padding: 4px 8px;
  border-radius: 8px;
}

/* Features Section */
.features {
  padding: var(--spacing-3xl) 0;
  background: var(--bg-secondary);
}

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

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.section-description {
  font-size: var(--font-size-xl);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

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

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  transition: all 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-md);
  display: block;
}

.feature-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

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

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

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

/* Pricing Section */
.pricing {
  padding: var(--spacing-3xl) 0;
  background: var(--bg-primary);
}

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

.pricing-toggle {
  display: flex;
  background: var(--bg-tertiary);
  border-radius: var(--radius-xl);
  padding: 8px;
  margin: 48px auto 64px;
  max-width: 600px;
  position: relative;
}

.toggle-option {
  flex: 1;
  text-align: center;
  padding: 20px 24px;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
}

.toggle-option.active {
  background: var(--bg-primary);
  box-shadow: var(--shadow-md);
}

.toggle-label {
  display: block;
  font-weight: 600;
  font-size: var(--font-size-base);
  color: var(--text-primary);
  margin-bottom: 4px;
}

.toggle-description {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.4;
}

.pricing-content {
  display: none;
}

.pricing-content.active {
  display: block;
}

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

.pricing-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  position: relative;
  transition: all 0.3s ease;
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.pricing-featured {
  border-color: var(--primary-purple);
  transform: scale(1.05);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary-gradient);
  color: white;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

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

.pricing-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.pricing-price {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: var(--spacing-sm);
}

.price-amount {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--primary-purple);
}

.price-period {
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
}

.pricing-note {
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
  margin-top: var(--spacing-sm);
  text-align: center;
}

.pricing-features {
  margin-bottom: var(--spacing-xl);
}

.feature-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

.feature-check {
  color: #10b981;
  font-weight: 700;
}

.pricing-button {
  width: 100%;
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.pricing-button:hover {
  background: var(--bg-tertiary);
}

.pricing-button-featured {
  background: var(--primary-gradient);
  color: white;
  border: none;
}

.pricing-button-featured:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Download Section */
.download {
  padding: var(--spacing-3xl) 0;
  background: var(--bg-secondary);
}

.download-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  text-align: center;
}

.download-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

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

.download-actions {
  margin-bottom: var(--spacing-xl);
}

.download-info {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xl);
  flex-wrap: wrap;
}

.info-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-tertiary);
  font-size: var(--font-size-sm);
}

.info-icon {
  font-size: var(--font-size-base);
}

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

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

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

.footer-brand {
  grid-column: span 1;
}

.footer-logo {
  width: 32px;
  height: 32px;
  margin-bottom: var(--spacing-sm);
}

.footer-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
  display: block;
  margin-bottom: var(--spacing-sm);
}

.footer-description {
  color: var(--text-tertiary);
  font-size: var(--font-size-sm);
}

.footer-heading {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-link {
  display: block;
  color: var(--text-secondary);
  text-decoration: none;
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-sm);
  transition: color 0.3s ease;
}

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

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

.footer-copyright {
  color: var(--text-tertiary);
  font-size: var(--font-size-sm);
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-container {
    padding: 0 var(--spacing-md);
  }
  
  .nav-links {
    gap: var(--spacing-md);
  }
  
  .hero-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    text-align: center;
  }
  
  .hero-title {
    font-size: var(--font-size-3xl);
  }
  
  .hero-stats {
    justify-content: center;
  }
  
  .contextual-container {
    grid-template-columns: 1fr;
    gap: 60px;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .download-info {
    flex-direction: column;
    align-items: center;
  }
  
  .floating-card {
    display: none;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 100px 0 60px;
  }
  
  .hero-title {
    font-size: var(--font-size-2xl);
  }
  
  .hero-description {
    font-size: var(--font-size-base);
  }
  
  .hero-actions {
    flex-direction: column;
  }
  
  .section-title {
    font-size: var(--font-size-2xl);
  }
  
  .download-title {
    font-size: var(--font-size-2xl);
  }
}