.ai-hero {
  min-height: calc(100svh - var(--header-height));
}

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

.ai-document > .toc-tabs {
  width: calc(100% - (var(--gutter) * 2));
  max-width: var(--page-width);
  margin-right: auto;
  margin-left: auto;
}

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

.ai-requirement-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(280px, .65fr);
  align-items: start;
  gap: 30px;
}

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

.ai-principle {
  display: grid;
  padding-top: 26px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--color-border);
  grid-template-columns: minmax(180px, .58fr) minmax(0, 1.42fr);
  gap: 28px;
}

.ai-principle h3,
.ai-principle p {
  margin-bottom: 0;
}

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

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

.ai-check-panel {
  position: sticky;
  top: calc(var(--header-height) + 22px);
  padding: 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel-raised);
  box-shadow: var(--shadow-card);
}

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

.ai-check-panel > p {
  margin-bottom: 0;
  color: var(--color-text-muted);
  font-size: 14px;
}

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

.ai-check-list li {
  padding-top: 13px;
  padding-bottom: 13px;
  border-bottom: 1px solid var(--color-border-soft);
}

.ai-check-list strong {
  color: var(--color-text);
}

.ai-tool-table th:first-child,
.ai-tool-table td:first-child {
  position: sticky;
  left: 0;
}

.ai-tool-table th:first-child {
  z-index: 2;
  background: var(--color-panel-raised);
}

.ai-tool-table td:first-child {
  z-index: 1;
  background: var(--color-panel);
}

.ai-editorial-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(260px, .5fr);
  align-items: start;
  gap: 54px;
}

.ai-editorial-main h3:first-child {
  margin-top: 0;
}

.ai-side-note {
  padding: 26px;
  border-top: 3px solid var(--color-accent);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  box-shadow: var(--shadow-soft);
}

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

.ai-side-note ul {
  margin-bottom: 0;
  padding-left: 20px;
  color: var(--color-text-muted);
}

.ai-channel-compare {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel-raised);
  box-shadow: var(--shadow-soft);
}

.ai-channel {
  min-width: 0;
  padding: 32px;
}

.ai-channel + .ai-channel {
  border-left: 1px solid var(--color-border);
}

.ai-channel-label {
  display: inline-block;
  margin-bottom: 18px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: .12em;
}

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

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

.ai-flow {
  display: flex;
  margin-top: 24px;
  align-items: stretch;
  gap: 10px;
}

.ai-flow-step {
  display: flex;
  min-width: 0;
  padding: 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  flex: 1;
  flex-direction: column;
  gap: 5px;
}

.ai-flow-step span {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
}

.ai-flow-step strong {
  color: var(--color-text);
  font-size: 13px;
}

.ai-flow-arrow {
  display: inline-flex;
  flex-shrink: 0;
  align-items: center;
  color: var(--color-accent);
  font-family: var(--font-mono);
}

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

.ai-dev-row {
  display: grid;
  padding-top: 30px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--color-border);
  grid-template-columns: minmax(210px, .55fr) minmax(0, 1.45fr);
  gap: 40px;
}

.ai-dev-heading {
  display: flex;
  align-items: flex-start;
  gap: 15px;
}

.ai-dev-heading h3 {
  margin-bottom: 0;
  font-size: 22px;
}

.ai-dev-mark {
  display: inline-flex;
  min-width: 44px;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  background: var(--color-panel-raised);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 750;
}

.ai-dev-row p {
  color: var(--color-text-muted);
}

.ai-dev-row p:last-child {
  margin-bottom: 0;
}

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

.ai-failure-item {
  display: grid;
  padding-top: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
  grid-template-columns: minmax(260px, .75fr) minmax(0, 1.25fr);
  align-items: start;
  gap: 38px;
}

.ai-failure-item h3 {
  margin-bottom: 9px;
  font-size: 19px;
}

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

.ai-failure-type {
  display: inline-flex;
  min-height: 26px;
  align-items: center;
  padding: 4px 9px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 11px;
}

.ai-route-guide {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(300px, .65fr);
  align-items: start;
  gap: 46px;
}

.ai-route-copy h3:first-child {
  margin-top: 0;
}

.ai-route-actions {
  display: grid;
  gap: 16px;
}

.ai-route-actions > div {
  padding: 25px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-soft);
}

.ai-route-actions > div:last-child {
  background: var(--color-panel-raised);
}

.ai-route-actions h3 {
  margin-top: 18px;
  font-size: 20px;
}

.ai-route-actions p {
  color: var(--color-text-muted);
  font-size: 14px;
}

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

@media (max-width: 960px) {
  .ai-requirement-layout,
  .ai-editorial-grid,
  .ai-route-guide {
    grid-template-columns: 1fr;
  }

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

  .ai-principle {
    grid-template-columns: minmax(160px, .55fr) minmax(0, 1.45fr);
  }

  .ai-editorial-grid,
  .ai-route-guide {
    gap: 32px;
  }

  .ai-flow {
    display: grid;
    grid-template-columns: 1fr;
  }

  .ai-flow-arrow {
    display: none;
  }
}

@media (max-width: 768px) {
  .ai-document > .toc-tabs {
    top: 8px;
  }

  .ai-principle,
  .ai-dev-row,
  .ai-failure-item {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .ai-channel-compare {
    grid-template-columns: 1fr;
  }

  .ai-channel + .ai-channel {
    border-top: 1px solid var(--color-border);
    border-left: 0;
  }

  .ai-channel {
    padding: 24px;
  }

  .ai-dev-row,
  .ai-failure-item {
    padding-top: 24px;
    padding-bottom: 24px;
  }
}

@media (max-width: 640px) {
  .ai-document > .toc-tabs {
    width: calc(100% - (var(--gutter) * 2));
  }

  .ai-check-panel,
  .ai-side-note,
  .ai-route-actions > div {
    padding: 22px;
  }

  .ai-principle {
    padding-top: 22px;
    padding-bottom: 22px;
  }

  .ai-channel {
    padding: 21px;
  }

  .ai-tool-table th,
  .ai-tool-table td {
    padding: 13px 15px;
  }
}