.ai-intro{position:relative;isolation:isolate}
.ai-intro>.hero-glow,.ai-intro>.dots{z-index:-1}
.ai-intro-grid{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);align-items:center;gap:64px}
.ai-intro-grid>*{min-width:0}
.ai-intro-copy h1{margin-top:28px}
.ai-lead{max-width:560px;margin-top:28px;color:var(--text-muted);font-size:var(--size-lead)}
.ai-trust{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}
.ai-brief{position:relative;padding:40px}
.ai-brief-mark{position:absolute;right:24px;top:-14px;width:48px;height:48px;transform:rotate(8deg);box-shadow:var(--glass-shadow)}
.ai-brief>.mono{font-size:var(--size-xs);letter-spacing:.06em}
.ai-brief h2{margin-top:20px;font-size:var(--size-h3)}
.ai-checklist{display:grid;gap:0;margin:24px 0 0}
.ai-checklist>div{display:grid;grid-template-columns:48px minmax(0,1fr);gap:16px;padding-block:16px;border-bottom:1px solid var(--border)}
.ai-checklist dt{font-weight:var(--weight-semibold);color:var(--accent-dark)}
.ai-checklist dd{margin:0;color:var(--text-muted);font-size:var(--size-nav)}
.ai-route{display:block;max-width:100%;width:100%;height:auto;margin-top:24px}
.ai-brief>p:last-child{margin-top:16px;font-size:var(--size-sm)}
.ai-document{position:relative}
.ai-chapter{max-width:100%;padding-top:24px;padding-bottom:48px}
.ai-chapter.prose{max-width:960px}
.ai-chapter.prose>h2:first-child{margin-top:0}
.ai-chapter>.section-head{margin-bottom:28px}
.ai-chapter>.prose{max-width:960px;margin-top:28px}
.ai-pair{grid-template-columns:repeat(2,minmax(0,1fr))}
.ai-pair h3{margin-top:20px}
.ai-pair p{margin-top:20px;color:var(--text-muted)}
.ai-chapter .callout p{margin-bottom:0}
.ai-chapter:last-child{padding-bottom:0}
@media(max-width:1023px){
  .ai-intro-grid{gap:36px;grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .ai-brief{padding:28px}
}
@media(max-width:768px){
  .ai-intro-grid{grid-template-columns:1fr;gap:48px}
  .ai-intro-copy{max-width:600px}
  .ai-brief{max-width:600px;width:100%}
  .ai-pair{grid-template-columns:1fr}
  .ai-chapter{padding-bottom:36px}
}
@media(max-width:640px){
  .ai-intro-copy h1{margin-top:24px}
  .ai-intro-copy .cta-row{margin-top:28px}
  .ai-lead{font-size:var(--size-body)}
  .ai-brief{padding:24px}
  .ai-brief-mark{width:36px;height:36px;right:20px;transform:none}
  .ai-checklist>div{grid-template-columns:40px minmax(0,1fr);gap:12px}
}