/* Long-form guide and FAQ layout for AIA materials. */
.article-main {
  padding-top: clamp(2.5rem, 5vw, 4.5rem);
  padding-bottom: 0;
}

.article-main article { min-width: 0; }

.article-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  gap: clamp(2.5rem, 7vw, 7rem);
  align-items: start;
  padding-bottom: clamp(3.5rem, 7vw, 6.5rem);
}

.article-hero-copy { min-width: 0; }

.article-hero h1 {
  max-width: 15ch;
  margin-top: 1.25rem;
  color: var(--ai-carbon);
  font-family: var(--font-ai-display);
  font-size: clamp(2.75rem, 6.3vw, 5.8rem);
  font-weight: 600;
  line-height: 0.98;
  letter-spacing: -0.055em;
}

.article-lead {
  max-width: 42ch;
  margin-top: 2rem;
  color: var(--ai-graphite);
  font-size: clamp(1.05rem, 1.7vw, 1.35rem);
  line-height: 1.48;
}

.article-principle {
  max-width: 45rem;
  margin-top: 2.25rem;
  padding: 1.25rem 0 1.25rem 1.25rem;
  border-left: 4px solid var(--ai-signal);
}

.article-principle span,
.article-label,
.article-no {
  color: var(--ai-carbon-muted);
  font-family: var(--font-ai-mono);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.article-principle p {
  margin-top: 0.45rem;
  color: var(--ai-carbon);
  font-size: clamp(1.05rem, 1.7vw, 1.25rem);
  font-weight: 500;
  line-height: 1.5;
}

.article-choice {
  padding: clamp(1.5rem, 3vw, 2.25rem);
  background: var(--ai-carbon);
  color: var(--ai-paper);
}

.article-choice .article-label { color: var(--ai-dust); }

.article-choice h2 {
  max-width: 12ch;
  margin-top: 0.75rem;
  color: var(--ai-paper);
  font-family: var(--font-ai-display);
  font-size: clamp(1.45rem, 2.4vw, 2.2rem);
  line-height: 1.12;
  letter-spacing: -0.035em;
}

.choice-context {
  max-width: 32ch;
  margin-top: 0.7rem;
  color: var(--ai-dust);
  font-size: 0.78rem;
  line-height: 1.45;
}

.choice-list {
  margin-top: 1.5rem;
  list-style: none;
  border-top: 1px solid color-mix(in srgb, var(--ai-paper) 28%, transparent);
}

.choice-list li {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr);
  gap: 0.75rem;
  padding: 1rem 0;
  border-bottom: 1px solid color-mix(in srgb, var(--ai-paper) 19%, transparent);
}

.choice-list li > span {
  padding-top: 0.16rem;
  color: var(--ai-signal);
  font-family: var(--font-ai-mono);
  font-size: 0.62rem;
}

.choice-list p {
  color: var(--ai-dust);
  font-size: 0.78rem;
  line-height: 1.35;
}

.choice-list strong {
  display: block;
  margin-top: 0.28rem;
  color: var(--ai-paper);
  font-size: 0.98rem;
  font-weight: 600;
}

.choice-list small {
  display: block;
  margin-top: 0.25rem;
  color: var(--ai-dust);
  font-size: 0.7rem;
  line-height: 1.4;
}

.choice-note {
  margin-top: 1.35rem;
  color: var(--ai-dust);
  font-size: 0.78rem;
}

.choice-note strong { color: var(--ai-signal); }

.article-trace {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  list-style: none;
  border-top: 1px solid var(--ai-carbon);
  border-bottom: 1px solid var(--ai-carbon);
}

.article-trace li {
  min-width: 0;
  padding: 1.15rem 0.75rem 1.2rem 0;
}

.article-trace li + li {
  padding-left: 0.75rem;
  border-left: 1px solid var(--ai-dust);
}

.article-trace span {
  display: block;
  color: var(--ai-signal-dark);
  font-family: var(--font-ai-mono);
  font-size: 0.58rem;
}

.article-trace strong {
  display: block;
  margin-top: 0.35rem;
  color: var(--ai-carbon);
  font-family: var(--font-ai-display);
  font-size: clamp(0.75rem, 1.4vw, 1rem);
  line-height: 1.2;
}

.article-section {
  display: grid;
  grid-template-columns: minmax(190px, 0.48fr) minmax(0, 1.52fr);
  gap: clamp(2.5rem, 7vw, 7rem);
  padding-block: clamp(4.5rem, 8vw, 7.5rem);
  border-bottom: 1px solid var(--ai-carbon);
}

.article-rail { align-self: start; }

.article-rail h2 {
  max-width: 12ch;
  margin-top: 0.8rem;
  color: var(--ai-carbon);
  font-family: var(--font-ai-display);
  font-size: clamp(1.65rem, 3.3vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.article-rail > p:last-child {
  max-width: 28ch;
  margin-top: 1rem;
  color: var(--ai-carbon-muted);
  font-size: 0.8rem;
}

.article-body {
  min-width: 0;
  max-width: 800px;
  font-size: 1rem;
  line-height: 1.7;
}

.article-body > * + * { margin-top: 1.4rem; }

.article-body .article-intro {
  color: var(--ai-carbon);
  font-size: clamp(1.08rem, 1.7vw, 1.3rem);
  line-height: 1.55;
}

.article-body h3 {
  margin-top: 3rem;
  color: var(--ai-carbon);
  font-family: var(--font-ai-display);
  font-size: clamp(1.2rem, 2vw, 1.7rem);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.025em;
}

.work-example {
  padding: clamp(1.25rem, 3vw, 2rem);
  background: var(--ai-carbon);
  color: var(--ai-paper);
}

.work-example .article-label { color: var(--ai-signal); }

.work-example blockquote {
  margin-top: 0.8rem;
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
  line-height: 1.5;
}

.prompt-card,
.example-prompt {
  padding: 1.4rem;
  border: 1px solid var(--ai-dust);
  background: var(--ai-paper-bright);
  color: var(--ai-carbon);
}

.prompt-card strong { color: var(--ai-signal-dark); }

.trial-branches {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.trial-branches h3 { margin-top: 0.45rem; }
.trial-branches ol { margin: 1rem 0 0; padding-left: 1.2rem; }
.trial-branches li + li { margin-top: 0.55rem; }
.trial-prompt { margin-top: 1.25rem; padding-top: 1.25rem; border-top: 1px solid var(--ai-dust); }

.boundary-note {
  padding: 1.4rem;
  border-left: 4px solid var(--ai-signal);
  background: color-mix(in srgb, var(--ai-dust) 17%, transparent);
}

.boundary-note p:last-child { margin-top: 0.45rem; font-weight: 500; }

.tool-stack { max-width: none; }

.tool-card {
  padding-block: 0 3.5rem;
  border-bottom: 1px solid var(--ai-dust);
}

.tool-card + .tool-card { padding-top: 3.5rem; }
.tool-card:last-child { padding-bottom: 0; border-bottom: 0; }
.tool-card > * + * { margin-top: 1.25rem; }

.tool-heading {
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr);
  gap: 1rem;
  align-items: end;
}

.tool-heading > span {
  color: var(--ai-signal-dark);
  font-family: var(--font-ai-mono);
  font-size: 0.68rem;
}

.tool-heading h3 {
  margin-top: 0.35rem;
  font-size: clamp(1.7rem, 3.5vw, 3.2rem);
}

.example-prompt {
  border-width: 0 0 0 3px;
  border-color: var(--ai-signal);
}

.example-prompt strong {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--ai-signal-dark);
  font-family: var(--font-ai-mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.tool-boundary {
  color: var(--ai-carbon-muted);
  font-size: 0.9rem;
}

.subhead {
  margin-top: 2.5rem;
  color: var(--ai-carbon);
  font-family: var(--font-ai-display);
  font-size: clamp(1.25rem, 2vw, 1.7rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.025em;
}

.product-pair { margin-top: 1rem; }

.skip-note {
  width: fit-content;
  padding: 0.45rem 0.7rem;
  background: color-mix(in srgb, var(--ai-signal) 12%, transparent);
  color: var(--ai-signal-dark);
  font-size: 0.8rem;
  font-weight: 600;
}

.service-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--ai-carbon);
  border-bottom: 1px solid var(--ai-carbon);
}

.service-strip > div { padding: 1.25rem 1rem 1.25rem 0; }
.service-strip > div + div { padding-left: 1rem; border-left: 1px solid var(--ai-dust); }
.service-strip span { color: var(--ai-signal-dark); font-family: var(--font-ai-mono); font-size: 0.68rem; font-weight: 600; }
.service-strip p { margin-top: 0.45rem; font-size: 0.86rem; line-height: 1.45; }

.check-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ai-dust);
}

.check-list li {
  position: relative;
  padding: 1rem 1rem 1rem 1.8rem;
  border-bottom: 1px solid var(--ai-dust);
}

.check-list li::before { position: absolute; left: 0; color: var(--ai-signal-dark); content: "□"; }

.next-list {
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ai-carbon);
}

.next-list li {
  display: grid;
  grid-template-columns: minmax(180px, 0.65fr) minmax(0, 1.35fr);
  gap: 1.5rem;
  padding: 1.05rem 0;
  border-bottom: 1px solid var(--ai-dust);
}

.next-list strong { color: var(--ai-carbon); }
.next-list span { color: var(--ai-carbon-muted); }

.stay-note {
  padding: 1.25rem;
  background: var(--ai-carbon);
  color: var(--ai-paper);
  font-weight: 500;
}

.human-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ai-carbon);
}

.human-grid li {
  padding: 1rem 0;
  border-bottom: 1px solid var(--ai-dust);
  font-weight: 500;
}

.human-grid li:nth-child(even) { padding-left: 1.25rem; border-left: 1px solid var(--ai-dust); }

.control-principle {
  padding: clamp(1.4rem, 3vw, 2.25rem);
  background: var(--ai-carbon);
  color: var(--ai-paper);
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
}

.cost-formula {
  padding: clamp(1.4rem, 3vw, 2.25rem);
  background: var(--ai-carbon);
  color: var(--ai-paper);
  font-family: var(--font-ai-display);
  font-size: clamp(1.05rem, 1.8vw, 1.35rem);
  font-weight: 500;
  line-height: 1.5;
}

.experiment-section { border-bottom-color: var(--ai-signal); }

.experiment-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ai-carbon);
  border-bottom: 1px solid var(--ai-carbon);
}

.experiment-steps li { padding: 1.25rem 1rem 1.5rem 0; }
.experiment-steps li + li { padding-left: 1rem; border-left: 1px solid var(--ai-dust); }
.experiment-steps span { color: var(--ai-signal-dark); font-family: var(--font-ai-mono); font-size: 0.68rem; }
.experiment-steps p { margin-top: 0.6rem; font-weight: 500; line-height: 1.45; }

.club-invite {
  margin-top: 3rem;
  padding: clamp(1.5rem, 4vw, 3rem);
  background: var(--ai-carbon);
  color: var(--ai-paper);
}

.club-invite .article-label { color: var(--ai-signal); }
.club-invite h2,
.club-invite h3 { max-width: 20ch; margin-top: 0.6rem; color: var(--ai-paper); }
.club-invite p:not(.article-label) { max-width: 55ch; margin-top: 1rem; color: var(--ai-dust); }
.club-invite .aia-primary { color: var(--ai-paper); }
.club-invite .aia-primary:hover,
.club-invite .aia-primary:focus-visible,
.faq-teaser .aia-primary:hover,
.faq-teaser .aia-primary:focus-visible {
  border-bottom-color: var(--ai-paper-bright);
  color: var(--ai-paper-bright);
  text-decoration: none;
}

.club-invite .aia-primary:focus-visible,
.faq-teaser .aia-primary:focus-visible { outline-color: var(--ai-signal); }

.faq-page .article-main { padding-top: clamp(1.5rem, 3vw, 2.5rem); }

.faq-page-hero {
  max-width: 66rem;
  padding-bottom: clamp(1.5rem, 3vw, 2.5rem);
  border-bottom: 1px solid var(--ai-carbon);
}

.faq-page-hero .aia-kicker { margin-top: 0; }

.faq-page-hero h1 {
  max-width: 18ch;
  margin-top: 1rem;
  color: var(--ai-carbon);
  font-family: var(--font-ai-display);
  font-size: clamp(2.6rem, 5vw, 4.8rem);
  font-weight: 600;
  line-height: 0.98;
  letter-spacing: -0.055em;
}

.faq-page-hero .article-lead { max-width: 55ch; }

.faq-back,
.faq-start,
.faq-club-link {
  display: inline-block;
  color: var(--ai-signal-dark);
  font-family: var(--font-ai-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-underline-offset: 0.2em;
}

.faq-start { margin-top: 1.75rem; }
.faq-page .faq-section { padding-top: clamp(3rem, 6vw, 5rem); }

.faq-teaser {
  padding: clamp(1.5rem, 4vw, 3rem);
  background: var(--ai-carbon);
  color: var(--ai-paper);
}

.faq-teaser .article-label { color: var(--ai-signal); }
.faq-teaser h3 { max-width: 26ch; margin-top: 0.6rem; color: var(--ai-paper); }
.faq-teaser p:not(.article-label) { max-width: 58ch; margin-top: 1rem; color: var(--ai-dust); }
.faq-teaser .aia-primary { color: var(--ai-paper); }

.faq-list { border-top: 1px solid var(--ai-carbon); }

.faq-item {
  scroll-margin-top: 1rem;
  border-bottom: 1px solid var(--ai-dust);
}

.faq-item[open] { background: color-mix(in srgb, var(--ai-dust) 16%, transparent); }
.faq-item:target { box-shadow: inset 3px 0 var(--ai-signal); }

.faq-item summary {
  position: relative;
  display: block;
  padding: 1.3rem 3rem 1.3rem 0;
  color: var(--ai-carbon);
  cursor: pointer;
  list-style: none;
}

.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:hover { background: color-mix(in srgb, var(--ai-dust) 10%, transparent); }

.faq-item summary::after {
  position: absolute;
  top: 1.05rem;
  right: 0;
  color: var(--ai-signal-dark);
  font-family: var(--font-ai-mono);
  font-size: 1.35rem;
  content: "+";
}

.faq-item[open] summary::after { content: "−"; }

.faq-number {
  padding-top: 0.15rem;
  color: var(--ai-signal-dark);
  font-family: var(--font-ai-mono);
  font-size: 0.65rem;
}

.faq-question {
  display: grid;
  grid-template-columns: 2.5rem minmax(0, 1fr);
  gap: 1rem;
  max-width: none;
  margin: 0;
  color: inherit;
  font-family: var(--font-ai-display);
  font-size: clamp(1rem, 1.8vw, 1.25rem);
  font-weight: 600;
  line-height: 1.35;
}

.faq-question > span:last-child { max-width: 38ch; }

.faq-answer {
  max-width: 68ch;
  padding: 0 3rem 1.65rem 3.5rem;
  color: var(--ai-graphite);
}

.faq-answer p + p { margin-top: 0.8rem; }
.faq-answer ul { margin-top: 0.8rem; padding-left: 1.2rem; }
.faq-answer li + li { margin-top: 0.45rem; }
.faq-answer ul + p { margin-top: 0.8rem; }
.faq-answer strong { color: var(--ai-carbon); }

.faq-next {
  display: inline-block;
  margin-top: 1rem;
  color: var(--ai-signal-dark);
  font-family: var(--font-ai-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-underline-offset: 0.2em;
}

.faq-outro {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(14rem, 0.65fr);
  gap: clamp(2rem, 6vw, 6rem);
  align-items: end;
}

.faq-outro-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.faq-outro .aia-primary { margin-top: 0; }
.faq-outro .faq-club-link { margin: 1rem 0 0; color: var(--ai-signal); }
.faq-outro .faq-club-link:hover,
.faq-outro .faq-club-link:focus-visible { color: var(--ai-paper-bright); }
.faq-outro .faq-club-link:focus-visible { outline-color: var(--ai-signal); }

.club-faq-hero {
  max-width: 58rem;
  padding-bottom: clamp(1.5rem, 3vw, 2.5rem);
}

.club-faq-hero .aia-kicker { margin-top: 0; }
.club-faq-hero h1 { max-width: 16ch; font-size: clamp(2.6rem, 5vw, 4.8rem); }

.club-faq-questions {
  max-width: 68rem;
  padding-block: clamp(1.75rem, 3vw, 2.75rem) clamp(4rem, 7vw, 6rem);
}

.club-faq-questions .faq-outro { margin-top: clamp(3rem, 6vw, 5rem); }

.faq-related {
  margin-top: 1.5rem;
  color: var(--ai-graphite);
}

.faq-related a {
  color: var(--ai-signal-dark);
  text-decoration: underline;
  text-decoration-color: var(--ai-signal);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

.faq-related a:hover { text-decoration-thickness: 2px; }

.optional-section,
.sources-section { padding-block: clamp(3.5rem, 6vw, 5rem); }

.article-disclosure { border-top: 1px solid var(--ai-carbon); border-bottom: 1px solid var(--ai-carbon); }

.article-disclosure summary {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.35rem 3rem 1.35rem 0;
  color: var(--ai-carbon);
  cursor: pointer;
  list-style: none;
}

.article-disclosure summary::-webkit-details-marker { display: none; }
.article-disclosure summary::after { position: absolute; top: 1.2rem; right: 0; color: var(--ai-signal-dark); font-family: var(--font-ai-mono); font-size: 1.35rem; content: "+"; }
.article-disclosure[open] summary::after { content: "−"; }
.article-disclosure summary span { font-family: var(--font-ai-display); font-size: clamp(1rem, 1.9vw, 1.35rem); font-weight: 600; }
.article-disclosure summary small { color: var(--ai-carbon-muted); font-family: var(--font-ai-mono); font-size: 0.68rem; }

.disclosure-content { padding: 1rem 0 2.5rem; }
.technical-content > section + section { margin-top: 3rem; padding-top: 3rem; border-top: 1px solid var(--ai-dust); }
.technical-content h3 { margin-top: 0.45rem; }
.technical-content section > p + p { margin-top: 1rem; }
.technical-content a { text-decoration: underline; text-decoration-color: var(--ai-signal); text-underline-offset: 0.18em; }

.host-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 1.25rem;
  border-top: 1px solid var(--ai-carbon);
}

.host-grid article { padding: 1.25rem 1.25rem 1.4rem 0; border-bottom: 1px solid var(--ai-dust); }
.host-grid article:nth-child(even) { padding-left: 1.25rem; border-left: 1px solid var(--ai-dust); }
.host-grid h4 { color: var(--ai-carbon); font-family: var(--font-ai-display); font-size: 1rem; line-height: 1.3; }
.host-grid p { margin-top: 0.5rem; color: var(--ai-carbon-muted); font-size: 0.85rem; }

.route-note {
  margin-top: 3rem;
  padding: 1.4rem;
  border-left: 4px solid var(--ai-signal);
  background: var(--ai-carbon);
  color: var(--ai-paper);
}

.route-note strong { display: block; margin-bottom: 0.45rem; color: var(--ai-signal); }

.source-groups {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2.5rem;
}

.source-groups h3 { margin: 0 0 1rem; font-size: 1rem; }
.source-groups ul { padding: 0; list-style: none; border-top: 1px solid var(--ai-dust); }
.source-groups li { padding: 0.65rem 0; border-bottom: 1px solid var(--ai-dust); font-size: 0.82rem; }
.source-groups a:hover { color: var(--ai-signal-dark); }
.source-boundary { grid-column: 1 / -1; max-width: 65ch; color: var(--ai-carbon-muted); font-size: 0.82rem; }

.layer-map,
.access-ladder {
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ai-carbon);
}

.layer-map li,
.access-ladder li {
  display: grid;
  grid-template-columns: 2.5rem minmax(210px, 0.9fr) minmax(180px, 1.1fr);
  gap: 1rem;
  align-items: start;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--ai-dust);
}

.layer-map li > span,
.access-ladder li > span {
  padding-top: 0.15rem;
  color: var(--ai-signal-dark);
  font-family: var(--font-ai-mono);
  font-size: 0.65rem;
}

.layer-map strong,
.access-ladder strong { color: var(--ai-carbon); }
.layer-map p,
.access-ladder p { margin-top: 0.3rem; color: var(--ai-carbon-muted); font-size: 0.88rem; line-height: 1.45; }
.layer-map em,
.access-ladder em { color: var(--ai-carbon-muted); font-family: var(--font-ai-mono); font-size: 0.72rem; font-style: normal; }

.tool-card a {
  text-decoration: underline;
  text-decoration-color: var(--ai-signal);
  text-underline-offset: 0.18em;
}

.host-grid h3,
.compare-pair h3,
.channel-grid h3 {
  margin-top: 0.45rem;
  color: var(--ai-carbon);
  font-family: var(--font-ai-display);
  font-size: 1.25rem;
  line-height: 1.2;
  letter-spacing: -0.025em;
}

.host-grid--five article:last-child { grid-column: 1 / -1; }

.host-grid .host-card-signal {
  padding: 1.35rem;
  background: var(--ai-carbon);
  color: var(--ai-paper);
}

.host-card-signal h3 { color: var(--ai-paper); }
.host-card-signal p { color: var(--ai-dust); }
.host-card-signal .article-label { color: var(--ai-signal); }

.route-flow {
  display: grid;
  grid-template-columns: auto auto minmax(90px, 0.65fr) auto minmax(150px, 1.2fr) auto minmax(130px, 1fr) auto auto;
  gap: 0.7rem;
  align-items: center;
  padding: 1.4rem;
  background: var(--ai-carbon);
  color: var(--ai-paper);
  font-size: 0.82rem;
}

.route-flow strong { color: var(--ai-paper); line-height: 1.3; }
.route-flow i { color: var(--ai-signal); font-family: var(--font-ai-mono); font-style: normal; }
.route-flow span { color: var(--ai-dust); }

.compare-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--ai-carbon);
  border-bottom: 1px solid var(--ai-carbon);
}

.compare-pair article { padding: 1.4rem 1.4rem 1.5rem 0; }
.compare-pair article + article { padding-left: 1.4rem; border-left: 1px solid var(--ai-dust); }
.compare-pair p:last-child { margin-top: 0.65rem; color: var(--ai-carbon-muted); font-size: 0.9rem; }

.hardware-steps,
.first-run-steps { grid-template-columns: repeat(5, minmax(0, 1fr)); }

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

.channel-grid article { padding: 1.4rem 1.4rem 1.5rem 0; border-bottom: 1px solid var(--ai-dust); }
.channel-grid article:nth-child(even) { padding-left: 1.4rem; border-left: 1px solid var(--ai-dust); }
.channel-grid span { color: var(--ai-signal-dark); font-family: var(--font-ai-mono); font-size: 0.65rem; }
.channel-grid p { margin-top: 0.6rem; color: var(--ai-carbon-muted); font-size: 0.9rem; }

.question-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ai-carbon);
}

.question-list li {
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr);
  gap: 0.7rem;
  padding: 1.1rem 1rem 1.1rem 0;
  border-bottom: 1px solid var(--ai-dust);
}

.question-list li:nth-child(even) { padding-left: 1rem; border-left: 1px solid var(--ai-dust); }
.question-list span { color: var(--ai-signal-dark); font-family: var(--font-ai-mono); font-size: 0.65rem; }
.question-list p { color: var(--ai-carbon); font-weight: 500; line-height: 1.45; }

.decision-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--ai-carbon);
  border-bottom: 1px solid var(--ai-carbon);
}

.decision-strip p { padding: 1.2rem 1rem 1.3rem 0; }
.decision-strip p + p { padding-left: 1rem; border-left: 1px solid var(--ai-dust); }
.decision-strip strong { display: block; color: var(--ai-carbon); font-size: 0.85rem; }
.decision-strip span { display: block; margin-top: 0.5rem; color: var(--ai-signal-dark); font-family: var(--font-ai-mono); font-size: 0.7rem; line-height: 1.4; }

.decision-strip--four { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (min-width: 901px) {
  .article-rail { position: sticky; top: 1.5rem; }
}

@media (max-width: 900px) {
  .article-hero { grid-template-columns: 1fr; }
  .article-choice { max-width: 680px; }
  .article-section { grid-template-columns: 1fr; }
  .article-rail h2 { max-width: 18ch; }
  .article-body { max-width: none; }
  .hardware-steps,
  .first-run-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hardware-steps li:nth-child(odd):last-child,
  .first-run-steps li:nth-child(odd):last-child { grid-column: 1 / -1; }
}

@media (max-width: 680px) {
  .aia-header { padding-block: 0.75rem; }
  .aia-nav a { display: inline-flex; align-items: center; min-height: 44px; }
  .faq-page .aia-header-action {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
    font-size: 0.75rem;
  }
  .faq-page .aia-nav { gap: 0.4rem 0.75rem; font-size: 0.75rem; }
  .club-faq-page .aia-nav a[aria-current="page"] { display: none; }
  .club-faq-page .aia-nav a[aria-current="page"]::before { content: none; }
  .article-main { padding-top: 1rem; }
  .article-hero { gap: 1.25rem; padding-bottom: 2.75rem; }
  .article-hero h1 { max-width: 100%; margin-top: 0.7rem; font-size: clamp(2rem, 9vw, 2.9rem); line-height: 1; }
  .article-lead { margin-top: 1rem; font-size: 1rem; line-height: 1.4; }
  .article-principle { margin-top: 1rem; padding: 0.7rem 0 0.7rem 0.85rem; }
  .article-principle p { font-size: 0.95rem; line-height: 1.4; }
  .article-choice { margin-inline: -1rem; padding: 1.25rem 1rem; }
  .article-choice h2 { margin-top: 0.5rem; }
  .choice-context { margin-top: 0.45rem; }
  .choice-list { margin-top: 1rem; }
  .choice-list li { padding-block: 0.75rem; }
  .article-trace { grid-template-columns: repeat(5, minmax(7.5rem, 1fr)); overflow-x: auto; }
  .article-section { gap: 2rem; padding-block: 3.5rem; }
  .article-rail h2 { max-width: 100%; font-size: 1.8rem; }
  .service-strip,
  .experiment-steps,
  .source-groups { grid-template-columns: 1fr; }
  .service-strip > div { padding: 1rem 0; }
  .service-strip > div + div { padding-left: 0; border-top: 1px solid var(--ai-dust); border-left: 0; }
  .check-list,
  .human-grid,
  .host-grid { grid-template-columns: 1fr; }
  .human-grid li:nth-child(even),
  .host-grid article:nth-child(even) { padding-left: 0; border-left: 0; }
  .next-list li { grid-template-columns: 1fr; gap: 0.35rem; }
  .experiment-steps li { padding: 1.15rem 0; }
  .experiment-steps li + li { border-top: 1px solid var(--ai-dust); border-left: 0; }
  .source-groups { gap: 2rem; }
  .layer-map li,
  .access-ladder li { grid-template-columns: 2rem minmax(0, 1fr); gap: 0.75rem; }
  .layer-map em,
  .access-ladder em { grid-column: 2; }
  .host-grid--five article:last-child { grid-column: auto; }
  .route-flow { grid-template-columns: 1fr; gap: 0.45rem; }
  .route-flow i { transform: rotate(90deg); transform-origin: left center; }
  .compare-pair,
  .channel-grid,
  .question-list,
  .trial-branches,
  .decision-strip { grid-template-columns: 1fr; }
  .compare-pair article { padding: 1.2rem 0; }
  .compare-pair article + article,
  .channel-grid article:nth-child(even),
  .question-list li:nth-child(even),
  .decision-strip p + p { padding-left: 0; border-top: 1px solid var(--ai-dust); border-left: 0; }
  .channel-grid article { padding: 1.2rem 0; }
  .question-list li { padding: 1rem 0; }
  .decision-strip p { padding: 1rem 0; }
  .faq-page-hero h1 { max-width: 100%; font-size: clamp(2.2rem, 10vw, 3.25rem); }
  .faq-page:not(.club-faq-page) .faq-page-hero {
    padding-bottom: 1rem;
  }
  .faq-page:not(.club-faq-page) .faq-page-hero h1 {
    font-size: clamp(2.05rem, 9vw, 3rem);
  }
  .agent-faq-questions { padding-top: 1rem; }
  .faq-item summary { padding-right: 2.5rem; }
  .faq-question { grid-template-columns: 2rem minmax(0, 1fr); gap: 0.75rem; }
  .faq-answer { padding-right: 0.5rem; padding-left: 2.75rem; }
  .faq-next,
  .faq-club-link { font-size: 0.75rem; }
  .faq-outro { grid-template-columns: 1fr; gap: 0; }
  .faq-outro-actions { margin-top: 1.5rem; }
  .faq-outro .faq-club-link { display: block; }
  .hardware-steps,
  .first-run-steps { grid-template-columns: 1fr; }
  .hardware-steps li:nth-child(odd):last-child,
  .first-run-steps li:nth-child(odd):last-child { grid-column: auto; }
}

@media print {
  .aia-utility,
  .aia-header,
  .aia-footer { display: none; }
  .article-main { width: 100%; padding: 0; }
  .article-section { break-inside: avoid; }
  .faq-section { break-inside: auto; }
  .faq-item > .faq-answer { display: block !important; }
  .article-disclosure > .disclosure-content { display: block; }
}