.ai-hero {
  padding-top: 76px;
  padding-bottom: 86px;
  border-bottom: 1px solid var(--color-line);
}

.ai-hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(440px, .95fr);
  align-items: center;
  gap: 64px;
}

.ai-hero-copy,
.ai-route-panel,
.topic-content {
  min-width: 0;
}

.ai-hero h1 {
  max-width: 700px;
  margin-top: 20px;
  margin-bottom: 0;
}

.ai-hero-actions {
  margin-top: 28px;
}

.ai-hero-lead {
  margin-top: 24px;
  margin-bottom: 0;
}

.ai-trust-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin: 26px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--color-line);
  list-style: none;
}

.ai-trust-list li {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--color-muted);
  font-size: 13px;
  white-space: nowrap;
}

.ai-trust-list svg {
  width: 16px;
  height: 16px;
  color: var(--color-accent);
}

.ai-route-panel {
  padding: 0;
  transform-style: preserve-3d;
}

.ai-route-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 34px minmax(0, 1fr) 34px minmax(0, 1fr);
  align-items: center;
  min-height: 280px;
  padding: 30px 24px;
}

.ai-route-stage {
  position: relative;
  min-width: 0;
  min-height: 154px;
  padding: 18px 14px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-paper);
}

.ai-route-stage.is-active {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

.ai-route-stage.is-active::before {
  position: absolute;
  top: 16px;
  bottom: 16px;
  left: -1px;
  width: 3px;
  border-radius: var(--radius-pill);
  content: "";
  background: var(--color-accent);
}

.ai-route-label {
  display: block;
  margin-bottom: 30px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .08em;
}

.ai-route-stage strong {
  display: block;
  font-size: 14px;
  line-height: 1.45;
}

.ai-route-stage p {
  margin: 8px 0 0;
  color: var(--color-muted);
  font-size: 12px;
}

.ai-route-link {
  height: 1px;
  border-top: 1px dashed var(--color-accent);
}

.ai-tool-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 18px 24px 22px;
  border-top: 1px solid var(--color-line);
  background: var(--color-panel-muted);
}

.ai-tool-strip span {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  max-width: 100%;
  padding-inline: 10px;
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  font-family: var(--font-mono);
  font-size: 11px;
  white-space: nowrap;
}

.ai-article {
  padding-top: 72px;
  padding-bottom: var(--section-space);
}

.ai-article .toc-tabs {
  margin-bottom: 22px;
}

.topic-ledger {
  display: grid;
  grid-template-columns: minmax(150px, .28fr) minmax(0, 1fr);
  gap: 64px;
  padding-top: 76px;
  padding-bottom: 76px;
  border-bottom: 1px solid var(--color-line);
}

.topic-ledger:last-child {
  border-bottom: 0;
}

.topic-ledger.is-reversed {
  grid-template-columns: minmax(0, 1fr) minmax(150px, .28fr);
}

.topic-ledger.is-reversed .topic-rail {
  grid-column: 2;
  grid-row: 1;
}

.topic-ledger.is-reversed .topic-content {
  grid-column: 1;
  grid-row: 1;
}

.topic-rail {
  min-width: 0;
  padding-top: 8px;
}

.topic-code {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  max-width: 100%;
  padding-inline: 9px;
  overflow: hidden;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-pill);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .06em;
  white-space: nowrap;
}

.topic-rail p {
  max-width: 180px;
  margin-top: 18px;
  color: var(--color-muted);
  font-size: 13px;
}

.topic-content {
  max-width: 900px;
}

.topic-content h2 {
  max-width: 820px;
}

.topic-content h3 {
  margin-top: 36px;
  font-size: 24px;
}

.topic-content > p {
  color: var(--color-muted);
}

.topic-content > p + p {
  margin-top: 18px;
}

.ai-note-grid,
.ai-choice-panel {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 30px 0;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-panel);
}

.ai-note-grid > div,
.ai-choice-panel > div {
  min-width: 0;
  padding: 22px;
  border-right: 1px solid var(--color-line);
}

.ai-note-grid > div:last-child,
.ai-choice-panel > div:last-child {
  border-right: 0;
}

.ai-note-grid strong,
.ai-choice-panel strong {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-display);
  font-size: 17px;
}

.ai-note-grid p,
.ai-choice-panel p {
  margin-bottom: 0;
  color: var(--color-muted);
  font-size: 14px;
}

.ai-choice-panel .topic-code {
  margin-bottom: 22px;
}

.ai-diagnostic-list {
  margin-top: 30px;
  border-top: 1px solid var(--color-line);
}

.ai-diagnostic-list section {
  display: grid;
  grid-template-columns: minmax(220px, .42fr) minmax(0, 1fr);
  gap: 36px;
  padding-top: 28px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--color-line);
}

.ai-diagnostic-list h3 {
  margin: 0;
  font-size: 20px;
}

.ai-diagnostic-list p {
  margin: 0;
  color: var(--color-muted);
}

.ai-ending-actions {
  margin-top: 30px;
}

.ai-policy-note {
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--color-line);
  font-size: 14px;
}

@media (max-width: 1100px) {
  .ai-hero-inner {
    grid-template-columns: 1fr;
  }

  .ai-route-panel {
    width: min(100%, 720px);
  }

  .topic-ledger,
  .topic-ledger.is-reversed {
    grid-template-columns: minmax(120px, .22fr) minmax(0, 1fr);
    gap: 40px;
  }

  .topic-ledger.is-reversed .topic-rail {
    grid-column: 1;
  }

  .topic-ledger.is-reversed .topic-content {
    grid-column: 2;
  }
}

@media (max-width: 800px) {
  .ai-hero {
    padding-top: 54px;
    padding-bottom: 64px;
  }

  .ai-route-body {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .ai-route-link {
    width: 1px;
    height: 28px;
    margin-inline: auto;
    border-top: 0;
    border-left: 1px dashed var(--color-accent);
  }

  .ai-route-stage {
    min-height: 126px;
  }

  .ai-route-label {
    margin-bottom: 20px;
  }

  .topic-ledger,
  .topic-ledger.is-reversed {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-top: 60px;
    padding-bottom: 60px;
  }

  .topic-ledger.is-reversed .topic-rail,
  .topic-ledger.is-reversed .topic-content {
    grid-column: 1;
  }

  .topic-ledger.is-reversed .topic-rail {
    grid-row: 1;
  }

  .topic-ledger.is-reversed .topic-content {
    grid-row: 2;
  }

  .topic-rail p {
    max-width: none;
  }

  .ai-note-grid,
  .ai-choice-panel {
    grid-template-columns: 1fr;
  }

  .ai-note-grid > div,
  .ai-choice-panel > div {
    border-right: 0;
    border-bottom: 1px solid var(--color-line);
  }

  .ai-note-grid > div:last-child,
  .ai-choice-panel > div:last-child {
    border-bottom: 0;
  }

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

@media (max-width: 640px) {
  .ai-hero-inner {
    gap: 42px;
  }

  .ai-hero-actions .btn,
  .ai-ending-actions .btn {
    flex: 1 1 150px;
  }

  .ai-trust-list {
    align-items: flex-start;
    flex-direction: column;
  }

  .ai-route-body {
    padding: 22px 16px;
  }

  .ai-tool-strip {
    padding-inline: 16px;
  }

  .ai-article {
    padding-top: 54px;
  }

  .topic-ledger,
  .topic-ledger.is-reversed {
    padding-top: 52px;
    padding-bottom: 52px;
  }

  .topic-content h3 {
    font-size: 21px;
  }

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