.ai-intro {
  padding-top: 64px;
  padding-bottom: 64px;
  background: linear-gradient(180deg, var(--hero-top), var(--hero-bottom));
}
.ai-intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 64px;
  align-items: center;
}
.ai-intro-grid > * {
  min-width: 0;
}
.ai-intro h1 {
  margin-top: 24px;
  max-width: 9em;
}
.ai-intro-facts {
  margin-top: 24px;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.8;
}
.ai-check-card {
  border-top: 4px solid var(--text);
}
.ai-check-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.ai-check-head > .mono {
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: .04em;
}
.ai-check-list {
  margin: 24px 0 0;
}
.ai-check-list > div {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 16px;
  padding-top: 16px;
  padding-bottom: 16px;
  border-top: 1px solid var(--border);
}
.ai-check-list dt {
  font-weight: 600;
}
.ai-check-list dd {
  margin: 0;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.8;
}
.ai-check-note {
  margin-top: 12px;
  padding: 16px;
  background: var(--bg-panel-2);
  border-radius: var(--r-s);
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.8;
}
.ai-document {
  padding-top: 28px;
}
.ai-section {
  padding-top: 64px;
}
.ai-section-heading {
  margin-bottom: 28px;
}
.ai-kicker {
  display: block;
  margin-bottom: 14px;
  color: var(--text-muted);
  font-size: 12px;
  letter-spacing: .06em;
}
.ai-section-heading .subtitle {
  max-width: 42em;
}
.ai-reading {
  max-width: var(--reading-width);
}
.ai-section .panel.prose > h3:first-child {
  margin-top: 0;
}
.ai-section .panel.prose > p:last-child {
  margin-bottom: 0;
}
.ai-section .motion-lines {
  margin-top: 20px;
}
.ai-platform-note {
  margin-top: 28px;
  margin-bottom: 20px;
  line-height: 1.9;
  color: var(--text-muted);
}
.ai-platform-note .text-link {
  margin-top: 14px;
  color: var(--text);
}
.ai-route-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 32px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
@media (max-width: 980px) {
  .ai-intro-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }
  .ai-intro h1 {
    max-width: none;
  }
}
@media (max-width: 640px) {
  .ai-intro {
    padding-top: 32px;
    padding-bottom: 40px;
  }
  .ai-intro h1 {
    font-size: 40px;
  }
  .ai-section {
    padding-top: 48px;
  }
  .ai-check-list > div {
    gap: 12px;
  }
  .ai-route-links {
    flex-direction: column;
    align-items: flex-start;
  }
}