.ai-intro{
  padding-top:64px;
  padding-bottom:56px;
}
.ai-intro-inner{
  text-align:center;
}
.ai-intro-copy{
  max-width:800px;
  margin:24px auto;
  color:var(--muted);
  line-height:1.85;
}
.ai-intro-trust{
  color:var(--muted);
  font-size:var(--size-small);
}
.ai-brief{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  max-width:880px;
  margin:40px auto 0;
  padding:24px;
  gap:24px;
  border:1px solid var(--border);
  border-radius:var(--r-win);
  background:var(--panel);
  box-shadow:var(--panel-shadow);
  text-align:left;
}
.ai-brief>div{
  min-width:0;
  padding-left:16px;
  border-left:4px solid var(--sketch);
}
.ai-brief-label{
  display:block;
  margin-bottom:6px;
  font-size:var(--size-small);
  color:var(--muted);
}
.ai-brief p{
  font-weight:var(--weight-semibold);
}
.ai-guide{
  padding-top:32px;
}
.ai-chapter{
  padding-top:40px;
  padding-bottom:40px;
}
.ai-chapter+.ai-chapter{
  border-top:1px solid var(--border);
}
.ai-kicker{
  margin-bottom:12px;
  font-size:var(--size-small);
  font-weight:var(--weight-semibold);
  letter-spacing:.08em;
}
.ai-tool-table{
  min-width:880px;
}
.ai-tool-table th:first-child{
  width:140px;
}
.ai-after-table{
  margin-top:28px;
}
.ai-dev-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:24px;
}
.ai-dev-grid>div{
  min-width:0;
}
.ai-dev-grid p{
  color:var(--muted);
}
.ai-dev-grid p+p{
  margin-top:20px;
}
.ai-faq{
  max-width:820px;
  margin-inline:auto;
}
.ai-next-links{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-top:32px;
}
@media(max-width:900px){
  .ai-dev-grid{
    grid-template-columns:1fr;
  }
}
@media(max-width:768px){
  .ai-intro{
    padding-top:36px;
    padding-bottom:36px;
  }
  .ai-intro-copy{
    margin-top:20px;
    margin-bottom:20px;
  }
  .ai-brief{
    margin-top:28px;
    padding:20px;
    gap:20px;
    grid-template-columns:1fr;
  }
  .ai-guide{
    padding-top:24px;
  }
  .ai-chapter{
    padding-top:28px;
    padding-bottom:28px;
  }
}