/* =====================================================
   AI Agent Spend Intelligence — Styles
   ===================================================== */

:root {
  --bg-primary: #0A1628;
  --bg-secondary: #0F1D32;
  --bg-card: #142038;
  --bg-elevated: #1A2845;
  --primary: #3B82F6;
  --primary-hover: #2563EB;
  --secondary: #10B981;
  --warning: #F59E0B;
  --danger: #EF4444;
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --border: #1E3A5F;
  --border-light: #2D4A6F;
  --gradient-start: #3B82F6;
  --gradient-end: #10B981;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
  --radius: 12px;
  --radius-sm: 8px;
  --container: 1200px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* =====================================================
   Navigation
   ===================================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  background: transparent;
  transition: all 0.3s ease;
}

.navbar.scrolled,
.navbar:hover {
  background: rgba(10, 22, 40, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.navbar-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

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

.navbar-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* =====================================================
   Buttons
   ===================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
}

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

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

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

.btn-outline:hover {
  background: var(--bg-card);
  border-color: var(--primary);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover {
  color: var(--text-primary);
  background: var(--bg-card);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 16px;
}

.btn-block {
  width: 100%;
}

/* =====================================================
   Hero Section
   ===================================================== */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  background: radial-gradient(ellipse at top, rgba(59, 130, 246, 0.15) 0%, transparent 50%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    radial-gradient(circle at 20% 80%, rgba(16, 185, 129, 0.1) 0%, transparent 30%),
    radial-gradient(circle at 80% 20%, rgba(59, 130, 246, 0.1) 0%, transparent 30%);
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  padding: 8px 16px;
  background: rgba(59, 130, 246, 0.15);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 20px;
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 64px;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 48px;
  padding-top: 48px;
  border-top: 1px solid var(--border);
}

.hero-stat {
  text-align: left;
}

.hero-stat-value {
  font-size: 36px;
  font-weight: 700;
  color: var(--text-primary);
}

.hero-stat-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}

.hero-stat-divider {
  width: 1px;
  height: 48px;
  background: var(--border);
}

/* =====================================================
   Problem Section
   ===================================================== */

.problem {
  padding: 100px 0;
  background: var(--bg-secondary);
}

.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.section-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 24px;
}

.section-title.centered {
  text-align: center;
}

.section-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  text-align: center;
  max-width: 600px;
  margin: 0 auto 48px;
}

.problem-content p {
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.problem-questions {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 32px 0;
}

.problem-question {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  font-size: 15px;
  color: var(--text-primary);
}

.icon-warning {
  color: var(--warning);
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-top: 2px;
}

.problem-visual {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.cost-card,
.roi-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.cost-card-header,
.roi-card-header {
  margin-bottom: 16px;
}

.cost-label,
.roi-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.cost-label {
  color: var(--text-muted);
}

.roi-label {
  color: var(--secondary);
}

.cost-big {
  font-size: 48px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.cost-period {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.cost-breakdown {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.cost-row {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
  color: var(--text-secondary);
}

.arrow-down {
  display: flex;
  justify-content: center;
  color: var(--primary);
}

.roi-metrics {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.roi-metric {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.roi-metric-label {
  font-size: 14px;
  color: var(--text-secondary);
}

.roi-metric-value {
  font-size: 18px;
  font-weight: 700;
}

.roi-metric-value.success {
  color: var(--secondary);
}

.roi-metric-value.danger {
  color: var(--danger);
}

/* =====================================================
   Features Section
   ===================================================== */

.features {
  padding: 100px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all 0.3s ease;
}

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

.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(59, 130, 246, 0.15);
  border-radius: var(--radius-sm);
  color: var(--primary);
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* =====================================================
   How It Works Section
   ===================================================== */

.how-it-works {
  padding: 100px 0;
  background: var(--bg-secondary);
}

.steps {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-top: 48px;
}

.step {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  position: relative;
}

.step-number {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary);
  color: white;
  font-size: 18px;
  font-weight: 700;
  border-radius: 50%;
  margin-bottom: 20px;
}

.step-content h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}

.step-content p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.step-connector {
  display: flex;
  align-items: center;
  color: var(--text-muted);
  padding-top: 40px;
}

.code-block {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
}

.code-block code {
  font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
  font-size: 13px;
  color: var(--secondary);
}

/* =====================================================
   Testimonials Section
   ===================================================== */

.testimonials {
  padding: 100px 0;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}

.testimonial-stars {
  color: var(--warning);
  font-size: 18px;
  margin-bottom: 16px;
}

.testimonial-text {
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.7;
  margin-bottom: 24px;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.testimonial-avatar {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  border-radius: 50%;
  font-size: 14px;
  font-weight: 600;
  color: white;
}

.testimonial-name {
  font-size: 14px;
  font-weight: 600;
}

.testimonial-role {
  font-size: 13px;
  color: var(--text-muted);
}

/* =====================================================
   Pricing Section
   ===================================================== */

.pricing {
  padding: 100px 0;
  background: var(--bg-secondary);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  position: relative;
}

.pricing-card.featured {
  border-color: var(--primary);
  background: linear-gradient(180deg, rgba(59, 130, 246, 0.1) 0%, var(--bg-card) 100%);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 16px;
  background: var(--primary);
  color: white;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-radius: 100px;
}

.pricing-tier {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.pricing-price {
  font-size: 48px;
  font-weight: 800;
  margin-bottom: 8px;
}

.pricing-price span {
  font-size: 18px;
  font-weight: 400;
  color: var(--text-muted);
}

.pricing-desc {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.pricing-features {
  list-style: none;
  margin-bottom: 24px;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.pricing-features li svg {
  color: var(--secondary);
  width: 18px;
  height: 18px;
}

.pricing-note {
  text-align: center;
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 24px;
}

/* =====================================================
   CTA Section
   ===================================================== */

.cta-section {
  padding: 100px 0;
  background: radial-gradient(ellipse at center, rgba(59, 130, 246, 0.15) 0%, transparent 50%);
}

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

.cta-content h2 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 16px;
}

.cta-content p {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.cta-content .hero-actions {
  justify-content: center;
  margin-bottom: 0;
}

/* =====================================================
   Footer
   ===================================================== */

.footer {
  padding: 60px 0 24px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 16px;
  max-width: 300px;
}

.footer-links h4 {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
}

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

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  font-size: 14px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

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

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--text-muted);
}

/* =====================================================
   Responsive
   ===================================================== */

@media (max-width: 1024px) {
  .problem-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

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

  .steps {
    flex-direction: column;
  }

  .step-connector {
    transform: rotate(90deg);
    padding: 0;
    justify-content: center;
  }

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

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
  }

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

@media (max-width: 768px) {
  .navbar-links {
    display: none;
  }

  .hero-stats {
    flex-direction: column;
    align-items: flex-start;
    gap: 24px;
  }

  .hero-stat-divider {
    display: none;
  }

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

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

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}