.ai-hero {
  min-height: auto;
  border-bottom: 1px solid var(--color-border);
}

.ai-hero-grid {
  padding-top: 84px;
  padding-bottom: 92px;
}

.ai-hero .hero-lead {
  max-width: 38em;
}

.ai-route-board {
  position: relative;
  padding: 28px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-panel);
  background:
    linear-gradient(145deg, var(--color-accent-a08), transparent),
    var(--color-panel);
  box-shadow: var(--shadow-panel), 0 0 52px var(--color-accent-a12);
}

.ai-route-board::before {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background:
    linear-gradient(90deg, transparent, var(--color-accent-a08), transparent);
  content: "";
  pointer-events: none;
}

.ai-route-head,
.ai-route-flow,
.ai-tool-cloud,
.ai-route-note {
  position: relative;
  z-index: 1;
}

.ai-route-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
}

.ai-route-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 34px minmax(0, 1fr) 34px minmax(0, 1fr);
  align-items: center;
  margin-top: 34px;
}

.ai-route-stage {
  display: flex;
  min-height: 142px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding: 18px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-panel-raised);
  text-align: center;
}

.ai-route-stage.is-active {
  border-color: var(--color-accent-dark);
  box-shadow: 0 0 24px var(--color-accent-a12);
}

.ai-route-stage strong {
  margin-top: 12px;
  font-size: 15px;
}

.ai-route-stage small {
  margin-top: 5px;
  font-size: 11px;
}

.ai-route-node {
  width: 30px;
  height: 34px;
  background: var(--color-border-strong);
  clip-path: polygon(25% 0, 75% 0, 100% 50%, 75% 100%, 25% 100%, 0 50%);
}

.ai-route-stage.is-active .ai-route-node {
  background: var(--color-accent);
  box-shadow: var(--shadow-accent);
}

.ai-route-link {
  height: 2px;
  background: linear-gradient(90deg, var(--color-border), var(--color-accent), var(--color-border));
  box-shadow: 0 0 8px var(--color-accent-a35);
}

.ai-tool-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 28px;
}

.ai-tool-cloud span {
  padding: 7px 11px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-bg);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 10px;
}

.ai-route-note {
  margin: 20px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 13px;
}

.ai-article {
  overflow-x: clip;
}

.ai-section-raised {
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-panel);
}

.ai-principles {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.ai-principle {
  min-width: 0;
  padding: 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-panel);
}

.ai-principle-mark,
.ai-panel-label {
  display: inline-flex;
  margin-bottom: 18px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
}

.ai-principle h3 {
  font-size: 22px;
}

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

.ai-compare-table td:nth-child(2) {
  color: var(--color-text);
}

.ai-tool-notes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.ai-tool-note {
  min-width: 0;
  padding: 30px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-panel);
}

.ai-tool-note header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.ai-tool-note h3 {
  margin-bottom: 0;
  font-size: 25px;
}

.ai-tool-note p {
  color: var(--color-text-muted);
}

.ai-tool-note p:last-child {
  margin-bottom: 0;
}

.ai-reading-grid {
  display: grid;
  grid-template-columns: minmax(240px, 0.72fr) minmax(0, 1.28fr);
  gap: 72px;
}

.ai-reading-grid h2 {
  margin-top: 18px;
}

.ai-reading-copy {
  color: var(--color-text-muted);
  font-size: 17px;
}

.ai-dual {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.ai-dual .panel {
  box-shadow: none;
}

.ai-check-list {
  margin: 22px 0 0;
  padding: 0;
  color: var(--color-text-muted);
  list-style: none;
}

.ai-check-list li {
  position: relative;
  padding-left: 24px;
}

.ai-check-list li + li {
  margin-top: 13px;
}

.ai-check-list li::before {
  position: absolute;
  top: 0;
  left: 0;
  color: var(--color-success);
  content: "✓";
}

.ai-dev-map {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--color-border);
}

.ai-dev-map > article {
  display: grid;
  grid-template-columns: minmax(180px, 0.4fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: 30px;
  padding-top: 30px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--color-border);
}

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

.ai-dev-title {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.ai-dev-title span {
  display: grid;
  min-width: 46px;
  min-height: 46px;
  place-items: center;
  border: 1px solid var(--color-accent-dark);
  border-radius: var(--radius-xs);
  background: var(--color-accent-a08);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 10px;
}

.ai-dev-title h3 {
  margin: 8px 0 0;
  font-size: 20px;
}

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

.ai-diagnostics > div {
  min-width: 0;
  padding: 26px;
  border-bottom: 1px solid var(--color-border);
}

.ai-diagnostics > div:nth-child(odd) {
  border-right: 1px solid var(--color-border);
}

.ai-diagnostics dt {
  margin-bottom: 10px;
  color: var(--color-text);
  font-weight: 800;
}

.ai-diagnostics dd {
  margin: 0;
  color: var(--color-text-muted);
}

.ai-selection {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.ai-selection article {
  padding: 26px;
  border-top: 2px solid var(--color-accent-dark);
  border-radius: var(--radius-sm);
  background: var(--color-panel-raised);
}

.ai-selection h3 {
  font-size: 21px;
}

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

.ai-decision-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 30px;
  margin-top: 28px;
  padding: 32px;
  border: 1px solid var(--color-accent-dark);
  border-radius: var(--radius-panel);
  background:
    radial-gradient(circle at right, var(--color-accent-a12), transparent),
    var(--color-panel-raised);
  box-shadow: 0 0 36px var(--color-accent-a08);
}

.ai-decision-panel h3 {
  font-size: 27px;
}

.ai-decision-panel p {
  max-width: var(--reading-width);
  margin-bottom: 0;
  color: var(--color-text-muted);
}

.ai-decision-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.ai-plan-note {
  margin-top: 24px;
  padding: 26px 30px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-bg);
}

.ai-plan-note h3 {
  font-size: 20px;
}

.ai-plan-note p {
  margin-bottom: 8px;
  color: var(--color-text-muted);
}

.ai-plan-note p:last-child {
  margin-bottom: 0;
}

@media (max-width: 1120px) {
  .ai-hero-grid {
    padding-top: 64px;
  }

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

  .ai-reading-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
  }

  .ai-dev-map > article {
    grid-template-columns: minmax(180px, 0.42fr) minmax(0, 1fr);
  }

  .ai-dev-map > article p:last-child {
    grid-column: 2;
  }
}

@media (max-width: 768px) {
  .ai-hero-grid {
    padding-top: 58px;
    padding-bottom: 70px;
  }

  .ai-route-flow {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }

  .ai-route-link {
    width: 2px;
    height: 24px;
    justify-self: center;
    background: linear-gradient(180deg, var(--color-border), var(--color-accent), var(--color-border));
  }

  .ai-route-stage {
    min-height: 112px;
  }

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

  .ai-diagnostics > div:nth-child(odd) {
    border-right: 0;
  }

  .ai-dev-map > article {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
  }

  .ai-dev-map > article p:last-child {
    grid-column: auto;
  }

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

  .ai-decision-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .ai-decision-actions .btn-primary,
  .ai-decision-actions .btn-secondary {
    width: 100%;
  }
}

@media (max-width: 640px) {
  .ai-route-board,
  .ai-principle,
  .ai-tool-note,
  .ai-decision-panel,
  .ai-plan-note {
    padding: 20px;
  }

  .ai-route-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .ai-tool-note header {
    align-items: flex-start;
    flex-direction: column-reverse;
  }

  .ai-tool-note h3 {
    font-size: 22px;
  }

  .ai-diagnostics > div {
    padding-inline: 4px;
  }
}