:root {
  /* Base palette */
  --color-bg: #F5F7FB;
  --color-surface: #FFFFFF;
  --color-text: #17211F;
  --color-muted: #5B6762;
  --color-border: #D0D7E8;

  /* Accent family — deep blue → indigo */
  --color-accent: #1E3A8A;
  --color-accent-end: #3730A3;
  --color-accent-tint: #E8EDF8;
  --color-surface-subtle: #F0F3FB;
  --section-band: #E9EEF8; /* alternating section band — perceptibly distinct from --color-bg, still subtle (D-04) */

  /* Gradient */
  --gradient-accent: linear-gradient(135deg, #1E3A8A 0%, #2D3AC7 55%, #3730A3 100%);

  /* Glow */
  --glow-color: rgba(45, 58, 199, 0.18);
  --glow-radius: 480px;
  --glow-btn-spread: 0 0 24px 4px rgba(45, 58, 199, 0.28);

  /* Card elevation (Phase 7) */
  --shadow-card: 0 4px 16px rgba(30, 58, 138, 0.10);
  --shadow-card-hover: 0 8px 24px rgba(30, 58, 138, 0.16);
  --card-lift: -2px;

  /* Glass (homepage hero accent card only) */
  --glass-bg: rgba(255, 255, 255, 0.12);
  --glass-border: rgba(255, 255, 255, 0.30);
  --glass-blur: 16px;

  /* Spacing scale (additive: 4xl added Phase 7) */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;

  /* Layout */
  --container: 1120px;
  --grid-gap: var(--space-lg); /* unified gutter for Phase 7 feature grids (.workflow/.capability/.use-case-grid) */

  /* Font weights (CLEAN-02) — numeric-named tokens for the three non-standard magic weights; standard 700 (bold) stays inline */
  --fw-650: 650;
  --fw-720: 720;
  --fw-760: 760;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  min-height: 100vh;
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  letter-spacing: 0;
}

a {
  color: inherit;
  text-decoration-color: transparent;
  text-underline-offset: 0.22em;
}

a:hover,
a:focus-visible {
  color: var(--color-accent);
  text-decoration-color: currentColor;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
  box-shadow: 0 8px 24px rgba(23, 33, 31, 0.06);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
  padding-top: var(--space-md);
  padding-bottom: var(--space-md);
}

.brand {
  font-size: 20px;
  font-weight: var(--fw-760);
  text-decoration: none;
}

.nav-list,
.footer-links {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-list a:not(.button-primary),
.footer-links a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: var(--space-xs) var(--space-sm);
  border-radius: 8px;
  color: var(--color-muted);
  font-size: 14px;
  font-weight: var(--fw-650);
  text-decoration: none;
}

.nav-list a[aria-current="page"] {
  color: var(--color-text);
  box-shadow: inset 0 -2px 0 var(--color-accent);
}

main {
  min-height: 58vh;
}

.page-hero {
  padding: var(--space-4xl) 0;
  position: relative;
  overflow: hidden;
}

.page-section {
  padding: var(--space-3xl) 0;
}

.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background: radial-gradient(ellipse var(--glow-radius) 360px at 65% 50%, var(--glow-color) 0%, transparent 70%);
}

.eyebrow {
  margin: 0 0 var(--space-sm);
  color: var(--color-accent);
  font-size: 14px;
  font-weight: var(--fw-650);
  text-transform: uppercase;
}

h1 {
  max-width: 820px;
  margin: 0;
  font-size: 48px;
  font-weight: var(--fw-760);
  line-height: 1.05;
  letter-spacing: 0;
}

.page-section h1 {
  font-size: 32px;
  font-weight: var(--fw-720);
  line-height: 1.15;
}

.lede {
  max-width: 720px;
  margin: var(--space-lg) 0 0;
  color: var(--color-muted);
  font-size: 18px;
}

.action-row {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-top: var(--space-xl);
}

.button-primary,
.button-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: var(--space-sm) var(--space-md);
  border-radius: 8px;
  font-weight: var(--fw-650);
  line-height: 1.3;
  text-decoration: none;
}

.button-primary {
  background: var(--gradient-accent);
  color: #FFFFFF;
  box-shadow: 0 2px 8px rgba(30,58,138,0.20);
  transition: box-shadow 180ms ease;
}

.button-primary:hover,
.button-primary:focus-visible {
  color: #FFFFFF;
  text-decoration-color: transparent;
  box-shadow: var(--glow-btn-spread);
}

.button-primary:focus-visible {
  outline: 2px solid #3730A3;
  outline-offset: 2px;
}

.button-secondary {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
}

.button-secondary:hover,
.button-secondary:focus-visible {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.button-secondary:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

.footer-inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-lg);
  flex-wrap: wrap;
  padding-top: var(--space-lg);
  padding-bottom: var(--space-lg);
}

.footer-inner p {
  max-width: 420px;
  margin: 0;
  color: var(--color-muted);
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.95fr);
  gap: var(--space-2xl);
  align-items: center;
}

.hero-copy {
  position: relative;
  z-index: 1;
  min-width: 0;
}

.trust-note {
  max-width: 680px;
  margin: var(--space-lg) 0 0;
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.5;
}

.story-section {
  padding: var(--space-3xl) 0;
}

.section-tint {
  background: var(--section-band);
}

.section-kicker {
  margin: 0 0 var(--space-sm);
  color: var(--color-accent);
  font-size: 13px;
  font-weight: var(--fw-650);
  text-transform: uppercase;
}

.section-heading {
  max-width: 760px;
  margin: 0;
  font-size: 32px;
  font-weight: var(--fw-720);
  line-height: 1.15;
  letter-spacing: 0;
}

.section-lede {
  max-width: 720px;
  margin: var(--space-md) 0 0;
  color: var(--color-muted);
  font-size: 18px;
}

.workflow-grid,
.capability-grid,
.use-case-grid {
  display: grid;
  gap: var(--grid-gap);
  margin-top: var(--space-xl);
}

.workflow-grid {
  grid-template-columns: repeat(5, 1fr);
}

.capability-grid {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.use-case-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.workflow-step,
.capability-card,
.use-case-card,
.result-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
}

.workflow-step,
.capability-card,
.use-case-card,
.detail-card {
  box-shadow: var(--shadow-card);
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.workflow-step:hover,
.capability-card:hover,
.use-case-card:hover,
.detail-card:hover {
  transform: translateY(var(--card-lift));
  box-shadow: var(--shadow-card-hover);
}

.workflow-step,
.capability-card,
.use-case-card {
  padding: var(--space-lg);
}

.workflow-step h3,
.capability-card h3,
.use-case-card h3 {
  margin: var(--space-md) 0 var(--space-sm);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0;
}

.workflow-step p,
.use-case-card p {
  margin: 0;
  color: var(--color-muted);
}

.step-marker {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--color-accent-tint);
  color: var(--color-accent);
  font-size: 14px;
  font-weight: var(--fw-760);
}

.capability-card ul {
  margin: var(--space-md) 0 0;
  padding-left: var(--space-lg);
  color: var(--color-muted);
}

.capability-card li + li {
  margin-top: var(--space-sm);
}

.result-panel {
  padding: var(--space-lg);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  box-shadow: 0 18px 48px rgba(30, 58, 138, 0.12);
}

.panel-row,
.metric-list,
.prediction-strip {
  margin-top: var(--space-md);
}

.panel-row,
.metric-list {
  display: grid;
  gap: var(--space-sm);
}

.panel-row {
  grid-template-columns: 88px minmax(0, 1fr);
  align-items: center;
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.metric-list {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.panel-row span,
.metric-list span {
  display: block;
  color: var(--color-muted);
  font-size: 13px;
  font-weight: var(--fw-650);
  line-height: 1.35;
}

.panel-row strong,
.metric-list strong {
  display: block;
  color: var(--color-text);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.35;
}

.plot-bars {
  display: flex;
  align-items: end;
  gap: var(--space-sm);
  height: 120px;
  margin-top: var(--space-lg);
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface-subtle);
}

.plot-bars span {
  display: block;
  width: 100%;
  min-height: 24px;
  border-radius: 8px 8px 0 0;
  background: var(--color-accent);
  opacity: 0.84;
}

.prediction-strip {
  padding: var(--space-md);
  border-radius: 8px;
  background: var(--color-accent-tint);
  color: var(--color-text);
  font-size: 14px;
}

.closing-cta {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.content-section {
  padding: var(--space-3xl) 0;
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

.detail-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--space-lg);
}

.detail-card h2,
.detail-card h3 {
  margin: 0 0 var(--space-sm);
  font-size: 20px;
  font-weight: var(--fw-720);
  line-height: 1.25;
  letter-spacing: 0;
}

.detail-card p {
  margin: 0;
  color: var(--color-muted);
}

.detail-card p + p {
  margin-top: var(--space-md);
}

.detail-list,
.policy-list {
  margin: var(--space-md) 0 0;
  padding-left: var(--space-lg);
  color: var(--color-muted);
}

.detail-list li + li,
.policy-list li + li {
  margin-top: var(--space-sm);
}

.pricing-table {
  width: 100%;
  margin-top: var(--space-xl);
  border-collapse: collapse;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
}

.pricing-table th,
.pricing-table td {
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

.pricing-table th {
  background: var(--color-surface-subtle);
  color: var(--color-text);
  font-size: 14px;
  font-weight: var(--fw-720);
}

.pricing-table td {
  color: var(--color-muted);
}

.pricing-table strong {
  color: var(--color-text);
}

.pricing-note {
  margin-top: var(--space-lg);
  padding: var(--space-lg);
  border-radius: 8px;
  background: var(--color-accent-tint);
  color: var(--color-text);
}

.pricing-note p {
  margin: 0;
}

.pricing-note p + p {
  margin-top: var(--space-sm);
}

.support-link {
  color: var(--color-accent);
  font-weight: var(--fw-760);
}

.back-to-top {
  position: fixed;
  right: var(--space-lg);
  bottom: var(--space-lg);
  z-index: 30;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--gradient-accent);
  color: #FFFFFF;
  font-size: 24px;
  font-weight: var(--fw-760);
  line-height: 1;
  text-decoration: none;
  box-shadow: 0 12px 32px rgba(30, 58, 138, 0.22);
  opacity: 0;
  pointer-events: none;
  transform: translateY(var(--space-md));
  visibility: hidden;
  transition: opacity 160ms ease, transform 160ms ease, visibility 160ms ease;
}

.back-to-top:hover,
.back-to-top:focus-visible {
  color: #FFFFFF;
  text-decoration-color: transparent;
  box-shadow: var(--glow-btn-spread);
}

.back-to-top:focus-visible {
  outline: 2px solid var(--color-accent-end);
  outline-offset: 2px;
}

.back-to-top.is-visible,
.back-to-top:focus-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
  visibility: visible;
}

/* ──────────────────────────────────────────────────────────────────────────
   BREAKPOINT CONSTANTS — single source of truth (CLEAN-02)
   Mobile breakpoint: 640 max-width (pixels). The next band up starts at 641 (= 640 + 1).
   CSS var() cannot be used inside @media conditions and this is a no-build static
   site (no PostCSS/Sass @custom-media), so these values are documented here rather
   than tokenized. The two mobile-boundary @media queries below MUST stay in sync:
     - the max-width 640 query  → mobile band
     - the min-width 641 query  → tablet band lower bound (641 = 640 + 1)
   If the 640 mobile breakpoint changes, update BOTH 640 and 641 together.
   ────────────────────────────────────────────────────────────────────────── */
@media (min-width: 769px) and (max-width: 1023px) {
  .workflow-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* mobile breakpoint pair (lower band) — see BREAKPOINT CONSTANTS above; keep the 641 bound in sync with the 640 query */
@media (min-width: 641px) and (max-width: 768px) {
  .workflow-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* mobile breakpoint pair (mobile band) — see BREAKPOINT CONSTANTS above; keep the 640 bound in sync with the 641 query */
@media (max-width: 640px) {
  .container {
    padding: 0 var(--space-md);
  }

  .header-inner,
  .footer-inner {
    align-items: flex-start;
  }

  .nav-list,
  .footer-links {
    gap: var(--space-xs);
  }

  .site-header {
    max-height: 72vh;
    overflow-y: auto;
  }

  /* hero shares --space-2xl with .page-section at mobile width — not enough room for a distinct step */
  .page-hero {
    padding: var(--space-2xl) 0;
  }

  .page-section {
    padding: var(--space-2xl) 0;
  }

  h1 {
    font-size: 36px;
  }

  .page-section h1 {
    font-size: 32px;
  }

  .lede {
    font-size: 16px;
  }

  .hero-grid,
  .workflow-grid,
  .capability-grid,
  .use-case-grid,
  .content-grid,
  .metric-list,
  .panel-row {
    grid-template-columns: 1fr;
  }

  .section-heading {
    font-size: 28px;
  }

  .section-lede {
    font-size: 16px;
  }

  .story-section {
    padding: var(--space-2xl) 0;
  }

  .workflow-step,
  .capability-card,
  .use-case-card,
  .result-panel,
  .detail-card,
  .pricing-note {
    padding: var(--space-md);
  }

  .pricing-table th,
  .pricing-table td {
    padding: var(--space-sm);
  }

  .back-to-top {
    right: var(--space-md);
    bottom: var(--space-md);
    width: 44px;
    height: 44px;
    font-size: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  /* Phase 7: suppress card hover animation — instant shift only, cards are decorative/non-interactive */
  .button-primary,
  .back-to-top,
  .workflow-step,
  .capability-card,
  .use-case-card,
  .detail-card {
    transition: none;
  }

  /* Phase 7: also neutralize the hover lift so cards don't jump under reduced motion (D-08) */
  .workflow-step:hover,
  .capability-card:hover,
  .use-case-card:hover,
  .detail-card:hover {
    transform: none;
  }
}