/* ==========================================================================
   CloudFast — Green Fluent Design System
   Duolingo Energy + Analytics Professionalism
   Primary Green: #51C84A | Supporting: Blue #4EA7FF, Yellow #FFC83D, Purple #A879F7, Coral #FF7C78
   ========================================================================== */

:root {
  /* PRIMARY GREEN IDENTITY */
  --cf-green-500: #51C84A;
  --cf-green-600: #43B93D;
  --cf-green-700: #379E32;
  --cf-green-800: #247A29;
  --cf-green-100: #E9FBE7;
  --cf-green-50: #F6FFF5;

  /* SUPPORTING COLOR SYSTEM */
  --cf-blue: #4EA7FF;
  --cf-blue-soft: #E8F5FF;
  --cf-blue-sky: #CDEEFF;

  --cf-yellow: #FFC83D;
  --cf-yellow-soft: #FFF6D4;

  --cf-purple: #A879F7;
  --cf-purple-soft: #F1E9FF;

  --cf-coral: #FF7C78;
  --cf-coral-soft: #FFF0EF;

  --cf-cyan: #37D7C4;
  --cf-cyan-soft: #E2FBF7;

  --cf-navy: #11163F;
  --cf-navy-dark: #0B0E2A;

  /* NEUTRALS */
  --cf-bg: #FFFFFF;
  --cf-canvas: #FBFCFA;
  --cf-surface-muted: #F5F7F3;
  --cf-border: #E3E8DF;
  --cf-border-strong: #D4DCD1;
  --cf-text: #30352F;
  --cf-text-muted: #727A70;
  --cf-text-subtle: #9AA198;

  /* TYPOGRAPHY */
  --font-sans: 'Plus Jakarta Sans', 'Nunito Sans', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', ui-monospace, Menlo, Monaco, monospace;

  /* RADII */
  --radius-ctrl: 12px;
  --radius-btn: 12px;
  --radius-card-sm: 14px;
  --radius-card: 16px;
  --radius-frame: 20px;
  --radius-pill: 9999px;

  /* SHADOWS & TACTILE DEPTH */
  --shadow-subtle: 0 1px 3px rgba(48, 53, 47, 0.04), 0 1px 2px rgba(48, 53, 47, 0.02);
  --shadow-card: 0 8px 24px rgba(81, 200, 74, 0.06), 0 1px 3px rgba(48, 53, 47, 0.03);
  --shadow-float: 0 16px 40px rgba(81, 200, 74, 0.08), 0 2px 8px rgba(48, 53, 47, 0.04);
}

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

body {
  background-color: var(--cf-canvas);
  color: var(--cf-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* ==========================================================================
   Brand Signature Motif — Signal Cloud ( ▂ ▅ ▃ ▇ ▄ )
   ========================================================================== */
.signal-mark,
.signal-cloud {
  display: inline-flex;
  align-items: flex-end;
  gap: 3px;
  height: 18px;
  vertical-align: middle;
}

.signal-bar {
  width: 3.5px;
  border-radius: 3px;
  display: inline-block;
  transition: transform 0.2s ease;
}

.signal-bar.bar-1 { height: 6px; background: var(--cf-green-500); }
.signal-bar.bar-2 { height: 14px; background: var(--cf-blue); }
.signal-bar.bar-3 { height: 8px; background: var(--cf-yellow); }
.signal-bar.bar-4 { height: 18px; background: var(--cf-purple); }
.signal-bar.bar-5 { height: 11px; background: var(--cf-coral); }

/* Animated Pulse for Verification */
@keyframes signalCloudPulse {
  0%, 100% { transform: scaleY(1); }
  50% { transform: scaleY(1.4); }
}

.signal-mark.animated .bar-1 { animation: signalCloudPulse 1.2s infinite ease-in-out 0.1s; }
.signal-mark.animated .bar-2 { animation: signalCloudPulse 1.2s infinite ease-in-out 0.3s; }
.signal-mark.animated .bar-3 { animation: signalCloudPulse 1.2s infinite ease-in-out 0.2s; }
.signal-mark.animated .bar-4 { animation: signalCloudPulse 1.2s infinite ease-in-out 0.5s; }
.signal-mark.animated .bar-5 { animation: signalCloudPulse 1.2s infinite ease-in-out 0.4s; }

/* ==========================================================================
   Header & Top Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--cf-border);
}

.header-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -0.5px;
  color: var(--cf-text);
}

.nav-tab-bar {
  display: flex;
  align-items: center;
  gap: 4px;
  height: 100%;
}

.nav-tab-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0 16px;
  height: 72px;
  color: var(--cf-text-muted);
  text-decoration: none;
  font-size: 15px;
  font-weight: 700;
  position: relative;
  transition: color 0.15s ease;
}

.nav-tab-item:hover {
  color: var(--cf-text);
}

.nav-tab-item.active {
  color: var(--cf-text);
  font-weight: 800;
}

.nav-tab-item.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 16px;
  right: 16px;
  height: 3px;
  background: var(--cf-green-500);
  border-radius: 3px 3px 0 0;
}

/* ==========================================================================
   Duolingo-Inspired Tactile Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-btn);
  font-size: 15px;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
  border: 1.5px solid var(--cf-border);
  background: var(--cf-bg);
  color: var(--cf-text);
  box-shadow: 0 2.5px 0 var(--cf-border-strong);
  transition: all 0.12s ease;
  font-family: var(--font-sans);
  user-select: none;
}

.btn:hover {
  background: var(--cf-surface-muted);
}

.btn:active {
  transform: translateY(2px);
  box-shadow: 0 0.5px 0 var(--cf-border-strong);
}

.btn:focus-visible {
  outline: 2px solid var(--cf-green-800);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--cf-green-500);
  color: #FFFFFF;
  border-color: var(--cf-green-500);
  box-shadow: 0 3px 0 var(--cf-green-700);
}

.btn-primary:hover {
  background: var(--cf-green-600);
  border-color: var(--cf-green-600);
  box-shadow: 0 3px 0 var(--cf-green-700);
  color: #FFFFFF;
}

.btn-primary:active {
  transform: translateY(2px);
  box-shadow: 0 1px 0 var(--cf-green-700);
}

.btn-secondary {
  background: #FFFFFF;
  border-color: var(--cf-border-strong);
  color: var(--cf-text);
  box-shadow: 0 2px 0 var(--cf-border-strong);
}

.btn-secondary:hover {
  background: var(--cf-surface-muted);
}

.btn-secondary:active {
  transform: translateY(1px);
  box-shadow: 0 0.5px 0 var(--cf-border-strong);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 13px;
  border-radius: 8px;
  box-shadow: 0 2px 0 var(--cf-border-strong);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 16px;
  border-radius: 14px;
  box-shadow: 0 3.5px 0 var(--cf-green-700);
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   Content Containers & Spacing
   ========================================================================== */
.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

.container-reading {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-spacing {
  padding: 96px 0;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 800;
  background: var(--cf-green-100);
  color: var(--cf-green-800);
  margin-bottom: 16px;
}

.section-title {
  font-size: 38px;
  font-weight: 900;
  letter-spacing: -1.2px;
  color: var(--cf-text);
  line-height: 1.15;
  margin-bottom: 14px;
}

.section-subtitle {
  font-size: 17px;
  color: var(--cf-text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   Hero Section & Coordinated Domain Input
   ========================================================================== */
.hero-wrapper {
  padding: 72px 0 48px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 5.5fr 4.5fr;
  gap: 48px;
  align-items: center;
}

.hero-title {
  font-size: 56px;
  font-weight: 900;
  letter-spacing: -2px;
  line-height: 1.06;
  color: var(--cf-text);
  margin-bottom: 18px;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--cf-text-muted);
  margin-bottom: 32px;
  line-height: 1.55;
  max-width: 520px;
}

.domain-cta-form {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--cf-bg);
  border: 1.5px solid var(--cf-border-strong);
  padding: 6px 6px 6px 18px;
  border-radius: var(--radius-ctrl);
  box-shadow: 0 4px 20px rgba(81, 200, 74, 0.1);
  max-width: 520px;
  margin-bottom: 14px;
  transition: all 0.15s ease;
}

.domain-cta-form:focus-within {
  border-color: var(--cf-green-500);
  box-shadow: 0 0 0 3px rgba(81, 200, 74, 0.2);
}

.domain-cta-input {
  flex: 1;
  border: none;
  background: transparent;
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 600;
  color: var(--cf-text);
  outline: none;
  min-width: 0;
}

.domain-cta-input::placeholder {
  color: var(--cf-text-subtle);
  font-weight: 500;
}

.hero-micro-text {
  font-size: 13.5px;
  color: var(--cf-text-muted);
  font-weight: 600;
}

/* ==========================================================================
   Product Showcase Frame
   ========================================================================== */
.product-frame {
  background: var(--cf-bg);
  border: 1.5px solid var(--cf-border);
  border-radius: var(--radius-frame);
  box-shadow: var(--shadow-float);
  overflow: hidden;
  text-align: left;
}

.product-frame-topbar {
  background: var(--cf-surface-muted);
  border-bottom: 1px solid var(--cf-border);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.product-frame-dots {
  display: flex;
  align-items: center;
  gap: 6px;
}

.frame-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.product-frame-body {
  padding: 24px;
}

/* ==========================================================================
   Metric Strip (Connected KPIs)
   ========================================================================== */
.metric-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--cf-surface-muted);
  border: 1px solid var(--cf-border);
  border-radius: var(--radius-card);
  padding: 16px 20px;
  margin-bottom: 24px;
}

.metric-strip-item {
  padding: 0 16px;
  border-right: 1px solid var(--cf-border);
}

.metric-strip-item:last-child {
  border-right: none;
}

.metric-label {
  font-size: 12px;
  font-weight: 800;
  color: var(--cf-text-muted);
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4px;
}

.metric-val {
  font-size: 26px;
  font-weight: 900;
  color: var(--cf-text);
  font-family: var(--font-mono);
  letter-spacing: -0.5px;
  font-variant-numeric: tabular-nums;
}

.badge-green {
  background: var(--cf-green-100);
  color: var(--cf-green-800);
  font-size: 11px;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
}

.badge-blue {
  background: var(--cf-blue-soft);
  color: #1A6CC4;
  font-size: 11px;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
}

.badge-coral {
  background: var(--cf-coral-soft);
  color: #C9332F;
  font-size: 11px;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
}

/* ==========================================================================
   Duolingo Alternating Rhythm Sections
   ========================================================================== */
.grid-asymmetric-45-55 {
  display: grid;
  grid-template-columns: 4.5fr 5.5fr;
  gap: 56px;
  align-items: center;
}

.grid-asymmetric-55-45 {
  display: grid;
  grid-template-columns: 5.5fr 4.5fr;
  gap: 56px;
  align-items: center;
}

/* Large Soft Sky Blue Section (#E8F5FF) */
.section-sky-blue {
  background: var(--cf-blue-soft);
  border-top: 1px solid var(--cf-blue-sky);
  border-bottom: 1px solid var(--cf-blue-sky);
  padding: 96px 0;
}

/* High-Contrast Dark Navy Section (#11163F) */
.section-navy {
  background: var(--cf-navy);
  color: #FFFFFF;
  padding: 96px 0;
}

.section-navy .section-title {
  color: #FFFFFF;
}

.section-navy .section-subtitle {
  color: #B8BEE2;
}

/* Green Wave Bottom CTA Section (#51C84A) */
.section-green-wave {
  background: var(--cf-green-500);
  color: #FFFFFF;
  padding: 88px 0 96px;
  position: relative;
  text-align: center;
}

.section-green-wave .section-title {
  color: #FFFFFF;
}

.section-green-wave .section-subtitle {
  color: #E9FBE7;
}

/* ==========================================================================
   Data Tables & Proportional Mini-Bars
   ========================================================================== */
.table-data-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid var(--cf-border);
  font-size: 14px;
}

.table-data-row:last-child {
  border-bottom: none;
}

.table-bar-cell {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 180px;
  justify-content: flex-end;
}

.table-bar-track {
  width: 90px;
  height: 6px;
  background: #EAEAE6;
  border-radius: 3px;
  overflow: hidden;
}

.table-bar-fill {
  height: 100%;
  background: var(--cf-blue);
  border-radius: 3px;
}

.table-bar-fill.green { background: var(--cf-green-500); }
.table-bar-fill.coral { background: var(--cf-coral); }
.table-bar-fill.purple { background: var(--cf-purple); }

/* ==========================================================================
   Journey Timeline Component
   ========================================================================== */
.journey-timeline-list {
  display: flex;
  flex-direction: column;
  position: relative;
  padding-left: 28px;
}

.journey-timeline-list::before {
  content: '';
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--cf-border-strong);
}

.journey-timeline-item {
  position: relative;
  padding-bottom: 24px;
}

.journey-timeline-item:last-child {
  padding-bottom: 0;
}

.journey-node-dot {
  position: absolute;
  left: -28px;
  top: 3px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #FFFFFF;
  border: 2px solid var(--cf-border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
}

.journey-node-dot.goal { border-color: var(--cf-blue); background: var(--cf-blue-soft); }
.journey-node-dot.return { border-color: var(--cf-purple); background: var(--cf-purple-soft); }
.journey-node-dot.purchase { border-color: var(--cf-green-500); background: var(--cf-green-100); }
.journey-node-dot.revenue { border-color: var(--cf-coral); background: var(--cf-coral-soft); }

/* ==========================================================================
   Pricing Section (Starter $5 & Pro $9)
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  max-width: 820px;
  margin: 0 auto;
}

.pricing-card {
  background: var(--cf-bg);
  border: 1.5px solid var(--cf-border);
  border-radius: var(--radius-card);
  padding: 36px 32px;
  box-shadow: var(--shadow-subtle);
  display: flex;
  flex-direction: column;
  position: relative;
}

.pricing-card.featured {
  border-color: var(--cf-green-500);
  background: var(--cf-green-50);
  box-shadow: 0 12px 32px rgba(81, 200, 74, 0.1);
}

.pricing-price-num {
  font-size: 46px;
  font-weight: 900;
  letter-spacing: -2px;
  color: var(--cf-text);
  line-height: 1;
}

.pricing-features-list {
  list-style: none;
  padding: 0;
  margin: 24px 0 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}

.pricing-features-list li {
  font-size: 14.5px;
  color: var(--cf-text-muted);
  display: flex;
  align-items: center;
  gap: 10px;
}

.pricing-features-list li strong {
  color: var(--cf-text);
}

/* ==========================================================================
   FAQ Accordion
   ========================================================================== */
.faq-wrap {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-row {
  background: var(--cf-bg);
  border: 1.5px solid var(--cf-border);
  border-radius: var(--radius-card-sm);
  overflow: hidden;
}

.faq-q {
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 800;
  color: var(--cf-text);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.faq-a {
  padding: 0 24px 20px;
  font-size: 14.5px;
  color: var(--cf-text-muted);
  line-height: 1.6;
  display: none;
}

.faq-row.active .faq-a {
  display: block;
}

.faq-icon {
  font-size: 16px;
  color: var(--cf-text-muted);
  transition: transform 0.2s ease;
}

.faq-row.active .faq-icon {
  transform: rotate(45deg);
  color: var(--cf-green-500);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--cf-border);
  background: var(--cf-bg);
  padding: 64px 0 36px;
}

.footer-columns {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-col-title {
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--cf-text);
  margin-bottom: 16px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 14px;
  color: var(--cf-text-muted);
  text-decoration: none;
  transition: color 0.15s ease;
}

.footer-links a:hover {
  color: var(--cf-green-600);
}

.footer-bottom {
  border-top: 1px solid var(--cf-border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--cf-text-muted);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 900px) {
  .hero-grid,
  .grid-asymmetric-45-55,
  .grid-asymmetric-55-45 {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .hero-title { font-size: 42px; }
  .metric-strip {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }
  .metric-strip-item {
    border-right: none;
    padding: 0;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .footer-columns {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .hero-title { font-size: 34px; }
  .nav-tab-bar { display: none; }
  .metric-strip { grid-template-columns: 1fr; }
  .footer-columns { grid-template-columns: 1fr; }
  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}