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

.ai-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(320px, .8fr);
  align-items: stretch;
  gap: 24px;
}

.ai-hero-copy {
  display: flex;
  min-height: 520px;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: clamp(28px, 6vw, 72px);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  box-shadow: var(--shadow-low);
}

.ai-hero-copy h1 {
  max-width: 760px;
  margin: 20px 0 18px;
}

.ai-hero-lead {
  max-width: 690px;
  margin-bottom: 0;
  color: var(--color-ink-muted);
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.75;
}

.ai-hero-copy .button-row {
  margin-top: 28px;
}

.ai-trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.ai-signal-panel {
  display: flex;
  min-height: 520px;
  flex-direction: column;
  justify-content: center;
}

.ai-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-line);
}

.ai-panel-label,
.ai-signal-code,
.ai-card-code {
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
}

.ai-signal-list {
  display: grid;
}

.ai-signal-item {
  padding: 22px 0;
  border-bottom: 1px solid var(--color-line);
}

.ai-signal-item:first-child {
  padding-top: 0;
}

.ai-signal-item:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.ai-signal-item strong {
  display: block;
  margin: 7px 0 5px;
  font-size: 17px;
}

.ai-signal-item p {
  color: var(--color-ink-muted);
  font-size: 13px;
  line-height: 1.7;
}

.ai-article {
  padding-top: 40px;
  padding-bottom: var(--section-space);
}

.ai-section {
  padding-top: 48px;
  padding-bottom: 48px;
}

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

.ai-section .section-head {
  max-width: 820px;
}

.ai-section > p,
.ai-section > h3,
.ai-section > ul,
.ai-section > ol {
  max-width: var(--text-max);
}

.ai-requirement-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 34px;
}

.ai-requirement-card {
  padding: 24px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-panel);
}

.ai-requirement-card h3 {
  margin: 12px 0 8px;
  font-size: 19px;
}

.ai-requirement-card p {
  color: var(--color-ink-muted);
  font-size: 14px;
}

.ai-card-code {
  display: inline-flex;
  min-width: 42px;
  min-height: 30px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-xs);
  color: var(--color-accent);
  font-weight: 750;
}

.ai-callout {
  max-width: var(--text-max);
  margin-top: 28px;
}

.ai-checklist {
  max-width: var(--text-max);
  margin-top: 30px;
}

.ai-checklist h3 {
  margin-bottom: 14px;
}

.ai-checklist ul {
  margin-bottom: 0;
  padding-left: 22px;
}

.ai-compare-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 32px;
}

.ai-compare-grid h3 {
  margin: 16px 0 10px;
}

.ai-compare-grid p {
  color: var(--color-ink-muted);
}

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

.ai-failure-item {
  padding: 28px 26px;
  border-bottom: 1px solid var(--color-line);
}

.ai-failure-item:nth-child(odd) {
  padding-left: 0;
  border-right: 1px solid var(--color-line);
}

.ai-failure-item h3 {
  margin: 0 0 10px;
  font-size: 19px;
}

.ai-failure-item p {
  color: var(--color-ink-muted);
  font-size: 14px;
}

.ai-end-actions {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 30px;
  margin-top: 36px;
}

.ai-end-actions h3 {
  margin-bottom: 8px;
}

.ai-end-actions p {
  color: var(--color-ink-muted);
}

@media (max-width: 960px) {
  .ai-hero-grid {
    grid-template-columns: 1fr;
  }

  .ai-hero-copy,
  .ai-signal-panel {
    min-height: auto;
  }

  .ai-signal-panel {
    padding-top: 30px;
    padding-bottom: 30px;
  }
}

@media (max-width: 768px) {
  .ai-hero-copy {
    padding: 28px 24px;
  }

  .ai-article {
    padding-top: 28px;
  }

  .ai-section {
    padding-top: 40px;
    padding-bottom: 40px;
  }

  .ai-requirement-grid,
  .ai-compare-grid,
  .ai-failure-list {
    grid-template-columns: 1fr;
  }

  .ai-failure-item,
  .ai-failure-item:nth-child(odd) {
    padding: 24px 0;
    border-right: 0;
    border-bottom: 1px solid var(--color-line);
  }

  .ai-end-actions {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .ai-hero-copy .button-row,
  .ai-hero-copy .button-row > *,
  .ai-end-actions .button-row,
  .ai-end-actions .button-row > * {
    width: 100%;
  }

  .ai-signal-panel {
    padding: 24px;
  }

  .ai-requirement-card {
    padding: 20px;
  }
}