:root {
  --ai-hero-grid: var(--color-deep-line);
  --ai-console-border: var(--color-deep-line);
  --ai-console-surface: var(--color-deep-raised);
  --ai-route-soft: var(--color-accent-shadow);
  --ai-light-copy: var(--color-hero-muted);
}

.ai-hero {
  background: var(--color-page);
}

.ai-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(420px, 1.1fr);
  min-height: 650px;
  align-items: center;
  gap: clamp(36px, 6vw, 88px);
  margin-top: 14px;
  padding-top: clamp(48px, 7vw, 86px);
  padding-bottom: clamp(48px, 7vw, 86px);
  overflow: hidden;
  border-radius: var(--radius-card);
  background:
    radial-gradient(circle at 82% 18%, var(--color-cyan-glow), var(--color-transparent) 34%),
    radial-gradient(circle at 68% 88%, var(--color-pink-glow), var(--color-transparent) 32%),
    var(--color-deep);
}

.ai-hero__copy {
  position: relative;
  z-index: 2;
  min-width: 0;
}

.ai-hero h1 {
  max-width: 560px;
  margin-top: 22px;
  margin-bottom: 0;
  color: var(--color-white);
  font-size: clamp(52px, 5vw, 68px);
}

.ai-hero__visual {
  min-width: 0;
}

.ai-console {
  position: relative;
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--ai-console-border);
  border-radius: var(--radius-lg);
  background: var(--ai-console-surface);
  box-shadow: var(--shadow-card);
}

.ai-console__head,
.ai-console__foot {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--color-hero-faint);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.ai-console__head {
  min-height: 46px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--ai-console-border);
}

.ai-console__signal {
  width: 8px;
  height: 8px;
  flex-shrink: 0;
  border-radius: var(--radius-pill);
  background: var(--color-cyan);
  box-shadow: 0 0 18px var(--color-cyan);
}

.ai-route-map {
  position: relative;
  min-height: 390px;
  overflow: hidden;
}

.ai-route-map svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.ai-grid-path {
  fill: none;
  stroke: var(--ai-hero-grid);
  stroke-width: 1;
}

.ai-route-glow {
  fill: none;
  stroke: var(--ai-route-soft);
  stroke-linecap: round;
  stroke-width: 20;
}

.ai-route-line {
  fill: none;
  stroke: var(--color-accent);
  stroke-linecap: round;
  stroke-width: 5;
}

.ai-route-node {
  fill: var(--color-accent-end);
  stroke: var(--color-white);
  stroke-width: 3;
}

.ai-route-node--cyan {
  fill: var(--color-cyan);
}

.ai-tool-cloud {
  position: absolute;
  inset: 0;
}

.ai-tool-cloud span {
  position: absolute;
  display: inline-flex;
  max-width: calc(100% - 32px);
  align-items: center;
  padding: 7px 12px;
  overflow: hidden;
  border: 1px solid var(--color-hero-line);
  border-radius: var(--radius-pill);
  background: var(--color-deep);
  color: var(--color-hero-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.ai-tool-cloud span:nth-child(1) {
  top: 9%;
  right: 8%;
}

.ai-tool-cloud span:nth-child(2) {
  top: 26%;
  left: 8%;
}

.ai-tool-cloud span:nth-child(3) {
  top: 43%;
  right: 12%;
}

.ai-tool-cloud span:nth-child(4) {
  bottom: 27%;
  left: 16%;
}

.ai-tool-cloud span:nth-child(5) {
  right: 6%;
  bottom: 10%;
}

.ai-tool-cloud span:nth-child(6) {
  bottom: 7%;
  left: 7%;
}

.ai-console__foot {
  justify-content: space-between;
  min-height: 48px;
  padding: 12px 18px;
  border-top: 1px solid var(--ai-console-border);
}

.ai-toc-wrap {
  padding-top: 22px;
}

.ai-section-muted {
  background: var(--color-panel);
}

.ai-section-deep {
  background: var(--color-deep);
  color: var(--ai-light-copy);
}

.ai-section-deep h2,
.ai-section-deep h3 {
  color: var(--color-white);
}

.section-heading--light p {
  color: var(--ai-light-copy);
}

.ai-mechanism-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.ai-mechanism-card {
  min-width: 0;
  padding: 26px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-page);
}

.ai-mechanism-card--wide {
  grid-column: span 2;
}

.ai-mechanism-card__mark,
.ai-selection__key {
  display: block;
  margin-bottom: 18px;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 750;
  letter-spacing: 0.08em;
}

.ai-mechanism-card p,
.ai-tool-notes p,
.ai-reading-copy p,
.ai-selection p {
  color: var(--color-text-muted);
}

.ai-tool-notes {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 22px;
}

.ai-tool-notes article {
  min-width: 0;
  padding: 22px;
  border-left: 3px solid var(--color-cyan);
  border-radius: var(--radius-sm);
  background: var(--color-page);
}

.ai-tool-notes h3 {
  font-size: 19px;
}

.ai-reading-grid {
  display: grid;
  grid-template-columns: minmax(250px, 0.7fr) minmax(0, 1.3fr);
  align-items: start;
  gap: clamp(40px, 7vw, 90px);
}

.ai-reading-grid .section-heading {
  position: sticky;
  top: calc(var(--toc-top) + var(--toc-height) + 28px);
  margin-bottom: 0;
}

.ai-reading-copy {
  min-width: 0;
}

.ai-reading-copy h3:not(:first-child) {
  margin-top: 34px;
}

.ai-reading-copy p {
  font-size: 16px;
  line-height: 1.85;
}

.ai-channel-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.ai-channel {
  min-width: 0;
  padding: 28px;
  border: 1px solid var(--color-deep-line);
  border-radius: var(--radius-md);
  background: var(--color-deep-raised);
}

.ai-channel h3 {
  margin-top: 20px;
}

.ai-channel p,
.ai-channel li {
  color: var(--ai-light-copy);
}

.ai-channel ul {
  display: grid;
  gap: 9px;
  margin-bottom: 0;
}

.ai-section-deep .callout {
  border-color: var(--color-deep-line);
  border-left-color: var(--color-warning);
  background: var(--color-deep-raised);
}

.ai-section-deep .callout strong {
  color: var(--color-white);
}

.ai-section-deep .callout p {
  margin-bottom: 0;
  color: var(--ai-light-copy);
}

.ai-failure-list {
  display: grid;
  border-top: 1px solid var(--color-border);
}

.ai-failure-row {
  display: grid;
  grid-template-columns: minmax(220px, 0.65fr) minmax(0, 1.35fr);
  gap: 34px;
  padding: 24px 10px;
  border-bottom: 1px solid var(--color-border);
}

.ai-failure-row h3 {
  margin-bottom: 10px;
  font-size: 19px;
}

.ai-failure-row p {
  margin-bottom: 0;
  color: var(--color-text-muted);
}

.ai-selection {
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.ai-selection__intro {
  max-width: 780px;
  padding: clamp(26px, 5vw, 48px);
}

.ai-selection__steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--color-border);
}

.ai-selection__steps article {
  min-width: 0;
  padding: 28px;
  border-right: 1px solid var(--color-border);
}

.ai-selection__steps article:last-child {
  border-right: 0;
}

.ai-selection__steps h3 {
  font-size: 19px;
}

.ai-selection__actions {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 28px;
  padding: 24px 28px;
  border-top: 1px solid var(--color-deep-line);
  background: var(--color-deep);
  color: var(--ai-light-copy);
}

.ai-selection__actions strong {
  display: block;
  margin-bottom: 5px;
  color: var(--color-white);
  font-size: 18px;
}

.ai-selection__actions p {
  max-width: 690px;
  margin-bottom: 0;
  color: var(--ai-light-copy);
}

@media (max-width: 980px) {
  .ai-hero__inner {
    grid-template-columns: minmax(0, 1fr);
    min-height: auto;
  }

  .ai-hero__visual {
    width: 100%;
    max-width: 720px;
    margin-inline: auto;
  }

  .ai-tool-notes {
    grid-template-columns: minmax(0, 1fr);
  }

  .ai-reading-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .ai-reading-grid .section-heading {
    position: static;
  }

  .ai-selection__steps {
    grid-template-columns: minmax(0, 1fr);
  }

  .ai-selection__steps article {
    border-right: 0;
    border-bottom: 1px solid var(--color-border);
  }

  .ai-selection__steps article:last-child {
    border-bottom: 0;
  }
}

@media (max-width: 768px) {
  .ai-hero__inner {
    gap: 28px;
    margin-top: 8px;
  }

  .ai-hero h1 {
    font-size: clamp(32px, 10vw, 40px);
  }

  .ai-route-map {
    min-height: 320px;
  }

  .ai-mechanism-grid,
  .ai-channel-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .ai-mechanism-card--wide {
    grid-column: auto;
  }

  .ai-failure-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }

  .ai-selection__actions {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 640px) {
  .ai-hero__inner {
    width: auto;
    margin-inline: var(--gutter);
    padding-top: 30px;
    padding-bottom: 30px;
    border-radius: var(--radius-lg);
  }

  .ai-console__head {
    padding-inline: 14px;
  }

  .ai-route-map {
    min-height: 270px;
  }

  .ai-tool-cloud span {
    padding: 5px 8px;
    font-size: 9px;
  }

  .ai-console__foot {
    padding-inline: 14px;
  }

  .ai-mechanism-card,
  .ai-channel {
    padding: 20px;
  }

  .ai-selection__intro,
  .ai-selection__steps article,
  .ai-selection__actions {
    padding: 20px;
  }
}