:root {
  --color-primary: #6366f1;
  --color-primary-light: #818cf8;
  --color-primary-dark: #4f46e5;
  --color-secondary: #8b5cf6;
  --color-accent: #06b6d4;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  
  --color-dark: #0f172a;
  --color-dark-light: #1e293b;
  --color-gray-dark: #334155;
  --color-gray: #64748b;
  --color-gray-light: #94a3b8;
  --color-light: #f1f5f9;
  --color-lighter: #f8fafc;
  --color-white: #ffffff;
  
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
  
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;
  
  --border-radius: 0.5rem;
  --border-radius-lg: 1rem;
  --border-radius-xl: 1.5rem;
  
  --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);
}

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

body {
  font-family: var(--font-family);
  color: var(--color-dark);
  background: var(--color-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

/* Navigation */
.nav {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-lighter);
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-dark);
}

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

.nav-links a {
  color: var(--color-gray-dark);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

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

.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--color-white);
  color: var(--color-dark);
  border: 2px solid var(--color-gray-light);
}

.btn-secondary:hover {
  background: var(--color-lighter);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

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

.btn-large {
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: 1.125rem;
}

/* Hero Section */
.hero {
  padding: var(--spacing-3xl) 0;
  background: linear-gradient(180deg, #ffffff 0%, #f8fafc 50%, #ffffff 100%);
}

.hero-content {
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.hero-title {
  font-size: 4rem;
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: var(--spacing-md);
  color: var(--color-dark);
  letter-spacing: -0.02em;
}

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

.hero-description {
  font-size: 1.25rem;
  color: var(--color-gray-dark);
  margin-bottom: var(--spacing-xl);
  line-height: 1.8;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  margin-bottom: var(--spacing-2xl);
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: var(--spacing-xl);
  justify-content: center;
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--color-lighter);
}

.stat {
  text-align: center;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  color: var(--color-gray-dark);
  font-size: 0.875rem;
  font-weight: 500;
  margin-top: var(--spacing-xs);
}

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

.section-title {
  font-size: 3rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--spacing-sm);
  color: var(--color-dark);
  letter-spacing: -0.02em;
}

.section-description {
  text-align: center;
  color: var(--color-gray-dark);
  font-size: 1.125rem;
  margin-bottom: var(--spacing-xl);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.feature-card {
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  background: var(--color-lighter);
  border: 1px solid var(--color-lighter);
  transition: all 0.2s;
}

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

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

.feature-card h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-dark);
}

.feature-card p {
  color: var(--color-gray-dark);
  line-height: 1.7;
}

/* AI Section */
.ai-section {
  padding: var(--spacing-3xl) 0;
  background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
}

.ai-rules {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.ai-rule {
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  background: var(--color-white);
  border: 2px solid var(--color-lighter);
  text-align: center;
  transition: all 0.2s;
}

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

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

.ai-rule h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-dark);
}

.ai-rule p {
  color: var(--color-gray-dark);
  font-size: 0.95rem;
}

/* Open Core Section */
.open-core {
  padding: var(--spacing-3xl) 0;
  background: var(--color-white);
  text-align: center;
}

.open-core-service {
  font-size: 1.125rem;
  color: var(--color-gray-dark);
  margin: var(--spacing-lg) 0;
  line-height: 1.8;
}

.open-core-tagline {
  font-size: 1.5rem;
  color: var(--color-primary);
  margin-top: var(--spacing-xl);
  font-weight: 600;
}

/* Pricing Section */
.pricing {
  padding: var(--spacing-3xl) 0;
  background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
  max-width: 1100px;
  margin-left: auto;
  margin-right: auto;
}

.pricing-card {
  background: var(--color-white);
  border-radius: var(--border-radius-xl);
  padding: var(--spacing-xl);
  border: 2px solid var(--color-lighter);
  position: relative;
  transition: all 0.2s;
}

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

.pricing-card.featured {
  border-color: var(--color-primary);
  transform: scale(1.05);
  box-shadow: var(--shadow-xl);
}

.pricing-card.featured:hover {
  transform: scale(1.05) translateY(-4px);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--border-radius);
  font-size: 0.875rem;
  font-weight: 600;
}

.pricing-header {
  margin-bottom: var(--spacing-lg);
}

.pricing-header h3 {
  font-size: 1.75rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-dark);
}

.pricing-price {
  display: flex;
  align-items: baseline;
  gap: var(--spacing-xs);
}

.price {
  font-size: 3rem;
  font-weight: 700;
  color: var(--color-dark);
}

.period {
  color: var(--color-gray-dark);
  font-size: 1.125rem;
}

.pricing-features {
  list-style: none;
  margin-bottom: var(--spacing-xl);
}

.pricing-features li {
  padding: var(--spacing-sm) 0;
  color: var(--color-gray-dark);
  line-height: 1.6;
}

.pricing-card .btn {
  width: 100%;
}

.pricing-explanation {
  margin-top: var(--spacing-3xl);
  padding: var(--spacing-xl);
  background: var(--color-lighter);
  border-radius: var(--border-radius-lg);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.pricing-explanation h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-dark);
}

.pricing-explanation p {
  color: var(--color-gray-dark);
  margin-bottom: var(--spacing-sm);
}

.pricing-explanation ul {
  list-style: none;
  margin: var(--spacing-md) 0;
}

.pricing-explanation ul li {
  padding: var(--spacing-sm) 0;
  color: var(--color-gray-dark);
  line-height: 1.7;
}

.pricing-tagline {
  margin-top: var(--spacing-lg);
  font-size: 1.125rem;
  color: var(--color-primary);
  font-weight: 600;
}

/* Installation Section */
.installation {
  padding: var(--spacing-3xl) 0;
  background: var(--color-white);
}

.installation-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.step-card {
  background: var(--color-lighter);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  border: 1px solid var(--color-lighter);
  position: relative;
  transition: all 0.2s;
}

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

.step-number {
  position: absolute;
  top: -20px;
  left: var(--spacing-lg);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: var(--color-white);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.25rem;
}

.step-card h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
  margin-top: var(--spacing-md);
  color: var(--color-dark);
}

.code-block {
  background: var(--color-dark);
  color: var(--color-success);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  margin: var(--spacing-md) 0;
  font-family: 'Monaco', 'Courier New', monospace;
  font-size: 0.875rem;
  overflow-x: auto;
}

.code-block code {
  color: var(--color-success);
  white-space: pre;
}

.step-note {
  color: var(--color-gray-dark);
  font-size: 0.875rem;
  margin-top: var(--spacing-xs);
}

.installation-cta {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  margin-top: var(--spacing-xl);
  flex-wrap: wrap;
}

/* CTA Section */
.cta {
  padding: var(--spacing-3xl) 0;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: var(--color-white);
}

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

.cta h2 {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  font-weight: 700;
}

.cta p {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xl);
  opacity: 0.95;
}

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

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

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

.cta .btn-secondary {
  border-color: var(--color-white);
  color: var(--color-white);
  background: transparent;
}

.cta .btn-secondary:hover {
  background: var(--color-white);
  color: var(--color-primary);
}

/* Footer */
.footer {
  padding: var(--spacing-xl) 0;
  background: var(--color-dark);
  color: var(--color-white);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
  margin-bottom: var(--spacing-md);
  color: var(--color-white);
}

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

.footer-section ul li {
  margin-bottom: var(--spacing-xs);
}

.footer-section a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: color 0.2s;
}

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

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.7);
}

/* Responsive */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.25rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .nav-links {
    display: none;
  }
  
  .hero-cta,
  .cta-buttons {
    flex-direction: column;
  }
  
  .hero-stats {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .pricing-card.featured {
    transform: none;
  }
  
  .pricing-card.featured:hover {
    transform: translateY(-4px);
  }
  
  .installation-steps {
    grid-template-columns: 1fr;
  }
  
  .installation-cta {
    flex-direction: column;
  }
  
  .ai-rules {
    grid-template-columns: 1fr;
  }
}