.ai-guide {
  overflow-x: clip;
}

.ai-hero {
  margin: 8px 16px 0;
  overflow: hidden;
  border: var(--line-hair) solid var(--color-panel);
  border-radius: var(--radius-panel);
  background:
    radial-gradient(circle, var(--color-panel-dot) 1px, transparent 1.2px) 0 0 / 16px 16px,
    linear-gradient(var(--color-panel-grid) var(--line-hair), transparent var(--line-hair)) 0 0 / 80px 80px,
    linear-gradient(90deg, var(--color-panel-grid) var(--line-hair), transparent var(--line-hair)) 0 0 / 80px 80px,
    var(--color-panel);
}

.ai-hero-grid {
  min-height: 620px;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(430px, .95fr);
  padding-inline: 0;
}

.ai-hero-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: 56px 48px;
  border-right: var(--line-hair) solid var(--color-panel-line);
}

.ai-hero-copy .badge {
  margin-bottom: 22px;
  color: var(--color-panel-text);
  border-color: var(--color-panel-line);
  background: var(--color-panel-wash);
}

.ai-hero-copy .eyebrow {
  margin-bottom: 14px;
  color: var(--color-panel-muted);
}

.ai-hero-copy h1 {
  max-width: 690px;
  margin-bottom: 22px;
  color: var(--color-panel-text);
}

.ai-hero-copy h1 .nowrap-term {
  color: var(--color-accent);
}

.ai-hero-lead {
  max-width: 650px;
  margin-bottom: 0;
  color: var(--color-panel-muted);
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.7;
}

.ai-hero-copy .button-outline {
  color: var(--color-panel-text);
  border-color: var(--color-panel-line);
}

.ai-hero-copy .button-outline:hover {
  color: var(--color-panel);
  border-color: var(--color-page);
  background: var(--color-page);
}

.ai-hero-copy .button svg {
  width: 17px;
  height: 17px;
}

.ai-fact-line {
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin-top: 28px;
  padding-top: 19px;
  border-top: var(--line-hair) solid var(--color-panel-line);
  color: var(--color-panel-muted);
  font-family: var(--font-mono);
  font-size: 11px;
}

.ai-fact-line span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.ai-fact-line i {
  width: 7px;
  height: 7px;
  flex-shrink: 0;
  border-radius: var(--radius-control);
  background: var(--color-accent);
}

.ai-route-board {
  position: relative;
  min-height: 620px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.ai-board-head,
.ai-board-foot {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--color-panel-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.ai-board-head {
  min-height: 62px;
  padding-inline: 28px;
  border-bottom: var(--line-hair) solid var(--color-panel-line);
}

.ai-board-foot {
  min-height: 58px;
  gap: 14px;
  padding-inline: 28px;
  border-top: var(--line-hair) solid var(--color-panel-line);
}

.ai-route-svg {
  width: 100%;
  flex: 1;
  min-height: 490px;
}

.ai-route-guide {
  fill: none;
  stroke: var(--color-panel-line);
  stroke-width: 1;
  stroke-dasharray: 3 8;
}

.ai-route-main {
  fill: none;
  stroke: var(--color-panel-text);
  stroke-width: 18;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.ai-route-branch {
  fill: none;
  stroke: var(--color-panel-muted);
  stroke-width: 5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.ai-route-dash {
  fill: none;
  stroke: var(--color-accent);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-dasharray: 7 11;
}

.ai-route-end {
  fill: var(--color-panel);
  stroke: var(--color-panel-text);
  stroke-width: 4;
}

.ai-route-node {
  fill: var(--color-panel-text);
  stroke: var(--color-panel);
  stroke-width: 4;
}

.ai-route-junction {
  fill: var(--color-accent);
  stroke: var(--color-panel);
  stroke-width: 6;
}

.ai-route-label {
  fill: var(--color-panel-text);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
}

.ai-route-caption {
  fill: var(--color-panel-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .06em;
}

.ai-toc-wrap {
  padding-top: 28px;
}

.ai-section-grid {
  display: grid;
  grid-template-columns: minmax(230px, .72fr) minmax(0, 1.58fr);
  gap: clamp(42px, 7vw, 104px);
}

.ai-section-index {
  align-self: start;
  position: sticky;
  top: calc(var(--toc-top) + 66px);
}

.ai-section-index .mono-label,
.ai-heading-row .mono-label {
  display: block;
  margin-bottom: 14px;
  color: var(--color-accent-dark);
}

.ai-section-index h2 {
  font-size: clamp(30px, 3.5vw, 44px);
}

.ai-section-index p {
  color: var(--color-text-muted);
}

.ai-reading {
  max-width: 780px;
}

.ai-reading > h3 {
  margin-top: 38px;
  padding-top: 22px;
  border-top: var(--line-hair) solid var(--color-border);
}

.ai-reading > h3:first-child {
  margin-top: 0;
}

.ai-reading p {
  color: var(--color-text-muted);
}

.ai-reading .callout {
  margin-top: 32px;
}

.ai-soft-section {
  background:
    linear-gradient(var(--color-border) var(--line-hair), transparent var(--line-hair)) 0 0 / 80px 80px,
    linear-gradient(90deg, var(--color-border) var(--line-hair), transparent var(--line-hair)) 0 0 / 80px 80px,
    var(--color-panel-soft);
  border-top: var(--line-hair) solid var(--color-border);
  border-bottom: var(--line-hair) solid var(--color-border);
}

.ai-heading-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 480px);
  align-items: end;
  gap: 42px;
  margin-bottom: 34px;
}

.ai-heading-row h2 {
  margin-bottom: 0;
}

.ai-heading-row > p {
  margin: 0;
  color: var(--color-text-muted);
}

.ai-tool-ledger {
  margin-top: 44px;
  border-top: var(--line-hair) solid var(--color-border);
}

.ai-tool-row {
  display: grid;
  grid-template-columns: minmax(220px, .72fr) minmax(0, 1.58fr);
  gap: 42px;
  padding: 34px 0;
  border-bottom: var(--line-hair) solid var(--color-border);
}

.ai-tool-name span {
  display: block;
  margin-bottom: 10px;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .08em;
}

.ai-tool-name h3 {
  margin-bottom: 0;
  font-size: 23px;
}

.ai-tool-row p {
  margin: 0;
  color: var(--color-text-muted);
}

.ai-panel-section {
  color: var(--color-panel-muted);
  background:
    radial-gradient(circle, var(--color-panel-dot) 1px, transparent 1.2px) 0 0 / 16px 16px,
    var(--color-panel);
}

.ai-heading-on-dark h2 {
  color: var(--color-panel-text);
}

.ai-heading-on-dark .mono-label {
  color: var(--color-accent);
}

.ai-heading-on-dark > p {
  color: var(--color-panel-muted);
}

.ai-split-notes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: var(--line-hair) solid var(--color-panel-line);
  border-left: var(--line-hair) solid var(--color-panel-line);
}

.ai-split-notes article {
  min-width: 0;
  padding: 34px;
  border-right: var(--line-hair) solid var(--color-panel-line);
  border-bottom: var(--line-hair) solid var(--color-panel-line);
}

.ai-split-notes h3 {
  color: var(--color-panel-text);
}

.ai-split-notes p,
.ai-split-notes li {
  color: var(--color-panel-muted);
}

.ai-split-notes ul {
  display: grid;
  gap: 10px;
  margin: 24px 0 0;
  padding: 22px 0 0 20px;
  border-top: var(--line-hair) solid var(--color-panel-line);
}

.ai-note-mark {
  min-height: 28px;
  display: inline-flex;
  align-items: center;
  margin-bottom: 20px;
  padding: 0 11px;
  border: var(--line-hair) solid var(--color-panel-line);
  border-radius: var(--radius-control);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .08em;
}

.ai-dark-callout {
  display: grid;
  grid-template-columns: minmax(220px, .7fr) minmax(0, 1.3fr);
  gap: 32px;
  margin-top: 28px;
  padding: 28px 32px;
  border: var(--line-hair) solid var(--color-panel-line);
  border-radius: var(--radius-card);
  background: var(--color-panel-wash);
}

.ai-dark-callout strong {
  color: var(--color-panel-text);
}

.ai-dark-callout p {
  margin: 0;
  color: var(--color-panel-muted);
}

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

.ai-diagnosis-list article {
  min-width: 0;
  padding: 30px;
  border-right: var(--line-hair) solid var(--color-border);
  border-bottom: var(--line-hair) solid var(--color-border);
  background: var(--color-page);
}

.ai-diagnosis-list h3 {
  position: relative;
  padding-left: 20px;
  font-size: 21px;
}

.ai-diagnosis-list h3::before {
  content: "";
  position: absolute;
  top: .42em;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: var(--radius-control);
  background: var(--color-accent);
}

.ai-diagnosis-list p {
  margin-bottom: 0;
  color: var(--color-text-muted);
}

.ai-link-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 36px;
}

.ai-direction-link {
  min-width: 0;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 8px 18px;
  padding: 24px;
  border: var(--line-hair) solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-panel-soft);
  transition:
    border-color var(--transition-fast),
    background-color var(--transition-fast);
}

.ai-direction-link:hover {
  border-color: var(--color-accent);
  background: var(--color-page);
}

.ai-direction-link .mono-label {
  grid-column: 1 / -1;
  color: var(--color-accent-dark);
}

.ai-direction-link strong {
  line-height: 1.45;
}

.ai-direction-link svg {
  width: 20px;
  height: 20px;
  color: var(--color-accent-dark);
}

@media (max-width: 980px) {
  .ai-hero-grid {
    grid-template-columns: 1fr;
  }

  .ai-hero-copy {
    min-height: 580px;
    border-right: 0;
    border-bottom: var(--line-hair) solid var(--color-panel-line);
  }

  .ai-route-board {
    min-height: 560px;
  }

  .ai-section-grid {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .ai-section-index {
    position: static;
    max-width: 720px;
  }

  .ai-heading-row {
    grid-template-columns: 1fr;
    align-items: start;
    gap: 12px;
  }
}

@media (max-width: 768px) {
  .ai-hero-copy {
    min-height: auto;
    padding: 48px 28px;
  }

  .ai-route-board {
    min-height: 500px;
  }

  .ai-route-svg {
    min-height: 410px;
  }

  .ai-tool-row,
  .ai-dark-callout {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .ai-split-notes,
  .ai-diagnosis-list {
    grid-template-columns: 1fr;
  }

  .ai-link-pair {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .ai-hero {
    margin-inline: 8px;
  }

  .ai-hero-copy {
    padding: 38px 22px;
  }

  .ai-hero-copy .hero-actions {
    width: 100%;
  }

  .ai-hero-copy .hero-actions .button {
    flex: 1 1 132px;
  }

  .ai-hero-lead {
    font-size: 16px;
  }

  .ai-fact-line {
    display: grid;
    grid-template-columns: 1fr;
  }

  .ai-route-board {
    min-height: 460px;
  }

  .ai-route-svg {
    min-height: 370px;
  }

  .ai-board-head,
  .ai-board-foot {
    padding-inline: 18px;
  }

  .ai-board-foot {
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .ai-heading-row {
    margin-bottom: 26px;
  }

  .ai-tool-row {
    padding: 28px 0;
  }

  .ai-split-notes article,
  .ai-diagnosis-list article {
    padding: 24px;
  }

  .ai-dark-callout {
    padding: 24px;
  }

  .ai-direction-link {
    padding: 21px;
  }
}