.ai-hero {
  overflow: clip;
  background: var(--color-ink);
  color: var(--color-dark-text);
}

.ai-hero-shell {
  display: grid;
  width: min(100%, calc(var(--content-width) + var(--gutter) * 2));
  min-height: 650px;
  margin-inline: auto;
  grid-template-columns: minmax(0, 1.05fr) minmax(390px, .95fr);
}

.ai-hero-copy {
  display: flex;
  min-width: 0;
  flex-direction: column;
  justify-content: center;
  padding-top: 72px;
  padding-right: clamp(34px, 5vw, 76px);
  padding-bottom: 72px;
  padding-left: var(--gutter);
}

.ai-hero-copy h1 {
  max-width: 650px;
  margin-bottom: 22px;
  color: var(--color-dark-text);
  font-size: clamp(52px, 5vw, 70px);
}

.ai-hero-eyebrow {
  align-self: flex-start;
  border-color: var(--color-dark-line);
  background: var(--color-ink-raised);
  color: var(--color-dark-soft);
}

.ai-hero-lead {
  max-width: 650px;
  margin-bottom: 28px;
  color: var(--color-dark-soft);
  font-size: clamp(17px, 1.8vw, 21px);
  line-height: 1.75;
}

.ai-hero-secondary {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border: 1px solid var(--color-dark-faint);
  border-radius: var(--radius-md);
  color: var(--color-dark-text);
  font-weight: 750;
  line-height: 1.15;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.ai-hero-secondary:hover {
  border-color: var(--color-dark-text);
  background: var(--color-ink-raised);
}

.ai-hero-trust {
  margin-top: 20px;
  margin-bottom: 22px;
  color: var(--color-dark-soft);
  font-size: 13px;
}

.ai-fact-row {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.ai-route-board {
  position: relative;
  display: flex;
  min-width: 0;
  flex-direction: column;
  justify-content: center;
  padding-top: 68px;
  padding-right: var(--gutter);
  padding-bottom: 68px;
  padding-left: clamp(28px, 4vw, 56px);
  overflow: hidden;
  border-left: 1px solid var(--color-dark-line);
  background: var(--color-ink-raised);
}

.ai-route-board::before {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(var(--color-dark-dot) 1px, transparent 1px);
  background-size: 22px 22px;
  content: "";
  opacity: .8;
  pointer-events: none;
}

.ai-route-board::after {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 34%;
  width: 1px;
  background: var(--color-dark-line);
  content: "";
  pointer-events: none;
}

.ai-board-label,
.ai-path,
.ai-dev-lanes,
.ai-board-note {
  position: relative;
  z-index: 1;
}

.ai-board-label {
  margin-bottom: 30px;
  color: var(--color-dark-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
}

.ai-path {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
  gap: 10px;
  align-items: center;
}

.ai-path-node {
  min-width: 0;
  min-height: 148px;
  padding: 18px;
  border: 1px solid var(--color-dark-line);
  border-radius: var(--radius-md);
  background: var(--color-ink);
}

.ai-node-mark {
  display: block;
  margin-bottom: 24px;
  color: var(--color-signal);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .08em;
}

.ai-path-node strong {
  display: block;
  margin-bottom: 7px;
  color: var(--color-dark-text);
  font-size: 15px;
}

.ai-path-node small {
  color: var(--color-dark-soft);
  font-size: 11px;
}

.ai-path-arrow {
  color: var(--color-dark-faint);
  font-family: var(--font-mono);
}

.ai-dev-lanes {
  display: grid;
  margin-top: 18px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border: 1px solid var(--color-dark-line);
  border-radius: var(--radius-md);
  background: var(--color-ink);
}

.ai-dev-lanes div {
  min-width: 0;
  padding: 15px;
  border-right: 1px solid var(--color-dark-line);
}

.ai-dev-lanes div:last-child {
  border-right: 0;
}

.ai-dev-lanes span {
  color: var(--color-dark-text);
  font-family: var(--font-mono);
  font-size: 11px;
}

.ai-dev-lanes p {
  margin: 7px 0 0;
  color: var(--color-dark-soft);
  font-size: 11px;
  line-height: 1.5;
}

.ai-board-note {
  margin-top: 22px;
  margin-bottom: 0;
  color: var(--color-dark-soft);
  font-size: 12px;
}

.ai-toc-wrap {
  position: relative;
  z-index: 20;
  padding-top: 22px;
  padding-bottom: 12px;
}

.ai-article {
  background: var(--color-canvas);
}

.ai-section-heading {
  display: grid;
  grid-template-columns: minmax(110px, 150px) minmax(0, 1fr);
  gap: clamp(24px, 5vw, 70px);
  align-items: start;
  margin-bottom: 46px;
  padding-top: 18px;
  border-top: 3px solid var(--color-text);
}

.ai-section-heading h2 {
  max-width: 850px;
}

.ai-section-heading .lead {
  margin-bottom: 0;
}

.ai-section-code {
  color: var(--color-text-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
}

.ai-requirement-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--color-line);
  border-left: 1px solid var(--color-line);
}

.ai-requirement {
  min-width: 0;
  padding: clamp(26px, 4vw, 44px);
  border-right: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  background: var(--color-canvas);
}

.ai-requirement:nth-child(2),
.ai-requirement:nth-child(3) {
  background: var(--color-surface);
}

.ai-requirement-key {
  display: inline-flex;
  margin-bottom: 30px;
  padding: 5px 10px;
  border-radius: var(--radius-pill);
  background: var(--color-ink);
  color: var(--color-dark-text);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .08em;
}

.ai-requirement h3 {
  font-size: 25px;
}

.ai-requirement p {
  margin-bottom: 0;
  color: var(--color-text-soft);
  line-height: 1.85;
}

.ai-matrix-section {
  background: var(--color-ink);
  color: var(--color-dark-text);
}

.ai-section-heading-light {
  border-top-color: var(--color-dark-text);
}

.ai-section-heading-light h2 {
  color: var(--color-dark-text);
}

.ai-section-heading-light .lead,
.ai-section-heading-light .ai-section-code {
  color: var(--color-dark-soft);
}

.ai-tool-table th {
  border-bottom-color: var(--color-dark-line);
  background: var(--color-ink-raised);
  color: var(--color-dark-text);
}

.ai-tool-table td {
  border-bottom-color: var(--color-dark-line);
  background: var(--color-ink);
  color: var(--color-dark-soft);
}

.ai-tool-table tbody tr:nth-child(even) td {
  background: var(--color-ink-raised);
}

.ai-tool-table td:first-child {
  color: var(--color-dark-text);
}

.ai-matrix-section .table-scroll {
  border-color: var(--color-dark-line);
}

.ai-article .prose > h2 {
  margin-top: 10px;
  margin-bottom: 34px;
}

.ai-article .prose > h3 {
  margin-top: 44px;
}

.ai-article .prose > p {
  line-height: 1.9;
}

.ai-dark-document {
  background: var(--color-ink);
  color: var(--color-dark-text);
}

.ai-dual-notes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--color-dark-line);
  border-left: 1px solid var(--color-dark-line);
}

.ai-dual-notes article {
  min-width: 0;
  padding: clamp(28px, 4vw, 48px);
  border-right: 1px solid var(--color-dark-line);
  border-bottom: 1px solid var(--color-dark-line);
}

.ai-dual-notes article:nth-child(even) {
  background: var(--color-ink-raised);
}

.ai-dual-notes h3 {
  margin-top: 22px;
  color: var(--color-dark-text);
}

.ai-dual-notes p,
.ai-dual-notes li {
  color: var(--color-dark-soft);
}

.ai-dual-notes ul {
  display: grid;
  gap: 10px;
  margin-bottom: 0;
}

.ai-dark-document .tag {
  border-color: var(--color-dark-line);
  background: var(--color-ink-raised);
  color: var(--color-dark-text);
}

.ai-dark-callout {
  border-left-color: var(--color-signal);
  background: var(--color-ink-raised);
  color: var(--color-dark-soft);
}

.ai-dark-callout strong {
  color: var(--color-dark-text);
}

.ai-dev-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.ai-dev-grid .panel {
  min-height: 250px;
}

.ai-dev-grid p {
  margin-bottom: 0;
  color: var(--color-text-soft);
  line-height: 1.85;
}

.ai-account-section {
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  background: var(--color-surface);
}

.ai-account-section h2 {
  margin-top: 12px;
}

.ai-account-section .callout {
  background: var(--color-canvas);
}

.ai-selection {
  border-top: 1px solid var(--color-line);
}

.ai-selection-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(330px, .7fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: start;
}

.ai-selection-list {
  border-top: 2px solid var(--color-text);
}

.ai-selection-list article {
  display: grid;
  grid-template-columns: minmax(160px, .45fr) minmax(0, 1fr);
  gap: 24px;
  padding-top: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-line);
}

.ai-selection-list strong {
  font-family: var(--font-display);
  font-size: 19px;
}

.ai-selection-list p {
  margin-bottom: 0;
  color: var(--color-text-soft);
}

.ai-next-panel {
  position: sticky;
  top: calc(var(--header-height) + 28px);
  padding: clamp(28px, 4vw, 42px);
  border-radius: var(--radius-lg);
  background: var(--color-ink);
  color: var(--color-dark-text);
  box-shadow: var(--shadow-card);
}

.ai-next-panel h3 {
  margin-top: 24px;
  color: var(--color-dark-text);
}

.ai-next-panel > p {
  color: var(--color-dark-soft);
}

.ai-panel-link {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: var(--color-dark-text);
  font-weight: 750;
}

.ai-panel-link:hover {
  color: var(--color-signal);
}

.ai-payment-note {
  margin-top: 24px;
  margin-bottom: 0;
  padding-top: 18px;
  border-top: 1px solid var(--color-dark-line);
  font-family: var(--font-mono);
  font-size: 11px;
}

@media (max-width: 1020px) {
  .ai-hero-shell {
    grid-template-columns: 1fr;
  }

  .ai-hero-copy {
    padding-right: var(--gutter);
  }

  .ai-route-board {
    min-height: 470px;
    padding-left: var(--gutter);
    border-top: 1px solid var(--color-dark-line);
    border-left: 0;
  }

  .ai-selection-layout {
    grid-template-columns: 1fr;
  }

  .ai-next-panel {
    position: static;
  }
}

@media (max-width: 768px) {
  .ai-hero-copy {
    padding-top: 56px;
    padding-bottom: 56px;
  }

  .ai-hero-copy h1 {
    font-size: clamp(32px, 9.5vw, 40px);
  }

  .ai-route-board {
    min-height: 0;
    padding-top: 48px;
    padding-bottom: 48px;
  }

  .ai-section-heading {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .ai-requirement-grid,
  .ai-dual-notes,
  .ai-dev-grid {
    grid-template-columns: 1fr;
  }

  .ai-requirement:nth-child(3) {
    background: var(--color-canvas);
  }

  .ai-requirement:nth-child(even) {
    background: var(--color-surface);
  }

  .ai-selection-list article {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

@media (max-width: 600px) {
  .ai-path {
    grid-template-columns: 1fr;
  }

  .ai-path-arrow {
    text-align: center;
    transform: rotate(90deg);
  }

  .ai-path-node {
    min-height: 0;
  }

  .ai-node-mark {
    margin-bottom: 14px;
  }

  .ai-dev-lanes {
    grid-template-columns: 1fr;
  }

  .ai-dev-lanes div {
    border-right: 0;
    border-bottom: 1px solid var(--color-dark-line);
  }

  .ai-dev-lanes div:last-child {
    border-bottom: 0;
  }

  .ai-route-board::after {
    display: none;
  }

  .ai-fact-row {
    align-items: flex-start;
    flex-direction: column;
  }

  .ai-fact-row .fact-pill {
    white-space: normal;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ai-path-arrow {
    transform: none;
  }
}