.ai-hero {
  position: relative;
  border-bottom: var(--border-hairline) solid var(--color-border);
  background:
    linear-gradient(90deg, var(--color-transparent), var(--color-accent-soft), var(--color-transparent)),
    var(--color-panel-glass);
}

.ai-hero::before,
.ai-hero::after {
  content: "";
  position: absolute;
  pointer-events: none;
}

.ai-hero::before {
  width: 28%;
  top: 0;
  bottom: 0;
  left: 50%;
  border-right: var(--border-hairline) dashed var(--color-border);
  border-left: var(--border-hairline) dashed var(--color-border);
  transform: translateX(-50%);
}

.ai-hero::after {
  width: 74%;
  height: 1px;
  right: 0;
  bottom: 28px;
  background: var(--color-accent);
}

.ai-hero-grid {
  min-height: 630px;
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(480px, 1.12fr);
  align-items: center;
  gap: clamp(36px, 7vw, 96px);
}

.ai-hero-copy {
  max-width: 650px;
}

.ai-hero-copy .eyebrow {
  margin-bottom: 20px;
}

.ai-hero-copy .lead {
  max-width: 620px;
}

.ai-hero-copy .button-row {
  margin-top: 28px;
}

.ai-fact-line {
  margin-top: 28px;
  padding-top: 18px;
  border-top: var(--border-hairline) dashed var(--color-border);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 0;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
}

.ai-fact-line span {
  padding: 0 12px;
  border-right: var(--border-hairline) solid var(--color-border);
}

.ai-fact-line span:first-child {
  padding-left: 0;
}

.ai-fact-line span:last-child {
  border-right: 0;
}

.ai-route-board {
  min-height: 470px;
  border: var(--border-hairline) solid var(--color-border);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
  background: var(--color-bg);
}

.ai-route-board::before {
  content: "";
  width: 92px;
  position: absolute;
  top: 42px;
  bottom: 42px;
  left: 50%;
  transform: translateX(-50%);
  border-right: var(--border-hairline) dashed var(--color-border);
  border-left: var(--border-hairline) dashed var(--color-border);
  background: var(--color-panel);
}

.ai-board-head,
.ai-board-foot {
  min-height: 42px;
  padding: 0 16px;
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.08em;
}

.ai-board-head {
  border-bottom: var(--border-hairline) solid var(--color-border);
}

.ai-board-foot {
  border-top: var(--border-hairline) solid var(--color-border);
}

.ai-route-board svg {
  width: 100%;
  height: 384px;
  position: relative;
  z-index: 1;
}

.ai-grid-line {
  fill: none;
  stroke: var(--color-border);
  stroke-width: 1;
  stroke-dasharray: 4 8;
}

.ai-signal-glow {
  fill: none;
  stroke: var(--color-accent-glow);
  stroke-width: 18;
  stroke-linecap: round;
}

.ai-signal-line,
.ai-return-line {
  fill: none;
  vector-effect: non-scaling-stroke;
}

.ai-signal-line {
  stroke: var(--color-accent);
  stroke-width: 3;
}

.ai-return-line {
  stroke: var(--color-accent-dark);
  stroke-width: 2;
  stroke-dasharray: 8 9;
}

.ai-node-ring {
  fill: var(--color-bg);
  stroke: var(--color-text);
  stroke-width: 2;
}

.ai-node-core {
  fill: var(--color-accent);
}

.ai-map-label {
  fill: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.ai-content-shell {
  padding-top: var(--section-space);
  padding-bottom: var(--section-space);
  display: grid;
  grid-template-columns: 190px minmax(0, 900px);
  justify-content: center;
  align-items: start;
  gap: clamp(36px, 6vw, 86px);
}

.ai-index {
  padding: 18px 0;
  border-top: var(--border-hairline) solid var(--color-accent);
  position: sticky;
  top: var(--toc-top);
  display: grid;
}

.ai-index-title {
  margin-bottom: 10px;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.ai-index a {
  min-height: 39px;
  padding: 7px 4px;
  border-bottom: var(--border-hairline) solid var(--color-border);
  display: flex;
  align-items: center;
  color: var(--color-text-muted);
  font-size: 13px;
  font-weight: 650;
  transition:
    color var(--transition-fast),
    padding-left var(--transition-fast);
}

.ai-index a:hover {
  padding-left: 10px;
  color: var(--color-text);
}

.ai-prose {
  min-width: 0;
}

.ai-section {
  padding-top: 64px;
  padding-bottom: 64px;
  border-bottom: var(--border-hairline) dashed var(--color-border);
}

.ai-section:first-child {
  padding-top: 0;
}

.ai-section:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

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

.ai-section h2 {
  max-width: 780px;
}

.ai-section h3 {
  font-size: 22px;
}

.ai-tool-map {
  margin-top: 32px;
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.ai-tool-map::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  border-left: var(--border-hairline) dashed var(--color-border);
}

.ai-tool-note {
  min-width: 0;
  padding: 24px;
  border-top: var(--border-hairline) solid var(--color-border);
  background: var(--color-panel-glass);
}

.ai-tool-note-wide {
  grid-column: 1 / -1;
  border: var(--border-hairline) solid var(--color-border);
  border-radius: var(--radius-md);
}

.ai-tool-code {
  margin-bottom: 14px;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.ai-tool-note p {
  margin-bottom: 0;
}

.ai-workflow {
  margin: 30px 0;
  border-top: var(--border-hairline) solid var(--color-border);
  border-bottom: var(--border-hairline) solid var(--color-border);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.ai-workflow article {
  min-width: 0;
  padding: 26px 22px;
}

.ai-workflow article + article {
  border-left: var(--border-hairline) dashed var(--color-border);
}

.ai-workflow-mark,
.ai-route-label {
  margin-bottom: 12px;
  display: block;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.ai-workflow p {
  margin-bottom: 0;
}

.ai-diagnostic-list {
  margin-top: 30px;
  border-top: var(--border-hairline) solid var(--color-border);
}

.ai-diagnostic-list article {
  padding: 24px 0 20px 54px;
  border-bottom: var(--border-hairline) solid var(--color-border);
  position: relative;
}

.ai-diagnostic-list article::before {
  content: "";
  width: 20px;
  height: 20px;
  border: var(--border-hairline) solid var(--color-accent-dark);
  border-radius: var(--radius-pill);
  position: absolute;
  top: 29px;
  left: 8px;
  background: var(--color-accent-soft);
}

.ai-diagnostic-list article::after {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: var(--radius-pill);
  position: absolute;
  top: 36px;
  left: 15px;
  background: var(--color-accent);
}

.ai-diagnostic-list h3 {
  margin-bottom: 8px;
}

.ai-diagnostic-list p {
  margin-bottom: 0;
}

.ai-route-links {
  margin-top: 34px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.ai-route-links > div {
  min-width: 0;
  padding: 26px;
  border: var(--border-hairline) solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
}

.ai-route-links p {
  min-height: 82px;
}

.ai-route-links .button {
  margin-top: 6px;
}

@media (max-width: 1000px) {
  .ai-hero-grid {
    min-height: auto;
    grid-template-columns: 1fr;
  }

  .ai-route-board {
    width: min(100%, 720px);
    margin-inline: auto;
  }

  .ai-content-shell {
    grid-template-columns: 1fr;
  }

  .ai-index {
    max-width: 100%;
    padding: 7px;
    border: var(--border-hairline) solid var(--color-border);
    border-radius: var(--radius-sm);
    top: var(--toc-top);
    z-index: 20;
    display: flex;
    gap: 4px;
    overflow-x: auto;
    background: var(--color-bg);
    -webkit-overflow-scrolling: touch;
  }

  .ai-index-title {
    display: none;
  }

  .ai-index a {
    min-height: 40px;
    padding: 0 12px;
    border: 0;
    border-radius: var(--radius-xs);
    flex: 0 0 auto;
    white-space: nowrap;
  }

  .ai-index a:hover {
    padding-left: 12px;
    background: var(--color-accent-soft);
  }
}

@media (max-width: 768px) {
  .ai-hero::before,
  .ai-hero::after {
    display: none;
  }

  .ai-route-board {
    min-height: 390px;
  }

  .ai-route-board svg {
    height: 304px;
  }

  .ai-map-label {
    display: none;
  }

  .ai-board-foot {
    justify-content: flex-start;
    flex-wrap: wrap;
    gap: 12px;
  }

  .ai-tool-map,
  .ai-workflow,
  .ai-route-links {
    grid-template-columns: 1fr;
  }

  .ai-tool-map::before {
    left: 10px;
  }

  .ai-tool-note,
  .ai-tool-note-wide {
    grid-column: auto;
    margin-left: 20px;
  }

  .ai-workflow article + article {
    border-top: var(--border-hairline) dashed var(--color-border);
    border-left: 0;
  }

  .ai-route-links p {
    min-height: 0;
  }
}

@media (max-width: 640px) {
  .ai-hero-grid {
    gap: 36px;
  }

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

  .ai-fact-line span,
  .ai-fact-line span:first-child {
    padding: 4px 8px;
    border-right: 0;
    border-bottom: var(--border-hairline) solid var(--color-border);
  }

  .ai-route-board {
    min-height: 328px;
    border-radius: var(--radius-md);
  }

  .ai-route-board::before {
    width: 64px;
  }

  .ai-route-board svg {
    height: 244px;
  }

  .ai-board-head span:last-child,
  .ai-board-foot span:last-child {
    display: none;
  }

  .ai-content-shell {
    gap: 42px;
  }

  .ai-section {
    padding-top: 52px;
    padding-bottom: 52px;
  }

  .ai-tool-note,
  .ai-tool-note-wide {
    padding: 20px;
  }

  .ai-diagnostic-list article {
    padding-left: 42px;
  }

  .ai-diagnostic-list article::before {
    left: 2px;
  }

  .ai-diagnostic-list article::after {
    left: 9px;
  }

  .ai-route-links > div {
    padding: 22px;
  }
}