.ai-hero {
  padding-top: clamp(58px, 8vw, 112px);
  padding-bottom: clamp(68px, 9vw, 124px);
  overflow-x: clip;
  border-bottom: 1px solid var(--color-border-soft);
}

.ai-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.86fr) minmax(460px, 1.14fr);
  align-items: center;
  gap: clamp(38px, 6vw, 88px);
}

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

.ai-hero-copy h1 {
  max-width: 680px;
  margin-bottom: 24px;
}

.ai-hero-copy .lead {
  margin-top: 24px;
  margin-bottom: 0;
}

.ai-fact-line {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.ai-fact-line span {
  min-height: 29px;
  padding: 5px 10px;
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 10px;
}

.ai-route-visual {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  box-shadow: var(--shadow-panel);
}

.ai-visual-chrome {
  min-height: 43px;
  padding: 0 16px;
  display: flex;
  align-items: center;
  gap: 6px;
  border-bottom: 1px solid var(--color-border-soft);
  background: var(--color-panel-deep);
}

.ai-chrome-dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: var(--radius-pill);
  background: var(--color-border);
}

.ai-chrome-dot-active {
  background: var(--color-accent);
}

.ai-visual-label {
  margin-left: 9px;
  color: var(--color-text-faint);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
}

.ai-visual-body {
  position: relative;
  padding: 22px 20px 18px;
  background-image:
    linear-gradient(var(--color-border-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-border-soft) 1px, transparent 1px);
  background-size: 42px 42px;
}

.ai-route-svg {
  width: 100%;
  height: auto;
}

.ai-route-grid {
  fill: none;
  stroke: var(--color-border-soft);
  stroke-width: 1;
  opacity: 0.72;
}

.ai-route-shadow {
  fill: none;
  stroke: var(--color-accent-dark);
  stroke-width: 13;
  stroke-linecap: round;
  opacity: 0.14;
}

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

.ai-route-ring {
  fill: var(--color-panel);
  stroke: var(--color-accent-dark);
  stroke-width: 2;
}

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

.ai-stage-labels {
  margin-top: -2px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.05em;
  text-align: center;
}

.ai-signal-notes {
  margin-top: 19px;
  padding-top: 14px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  border-top: 1px solid var(--color-border-soft);
}

.ai-signal-notes span {
  padding: 3px 8px;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-xs);
  background: var(--color-panel-deep);
  color: var(--color-text-faint);
  font-family: var(--font-mono);
  font-size: 9px;
}

.ai-document {
  background: var(--color-bg);
}

.ai-document > .wrap-content {
  padding-top: clamp(52px, 7vw, 92px);
  padding-bottom: var(--section-space);
}

.ai-section {
  padding-top: clamp(62px, 8vw, 108px);
  padding-bottom: clamp(62px, 8vw, 108px);
  border-bottom: 1px solid var(--color-border-soft);
  scroll-margin-top: var(--toc-offset);
}

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

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

.ai-principle {
  min-width: 0;
  padding: clamp(24px, 4vw, 42px);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-panel);
}

.ai-principle:nth-child(even) {
  background: var(--color-panel-raised);
}

.ai-principle-code {
  display: inline-block;
  margin-bottom: 13px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
}

.ai-principle h3 {
  font-size: 25px;
}

.ai-principle p,
.ai-tool-copy p,
.ai-process-row p,
.ai-split-panel p,
.ai-dev-item p,
.ai-selection-grid p {
  color: var(--color-text-muted);
}

.ai-tool-archive {
  border-top: 1px solid var(--color-border);
}

.ai-tool-band {
  min-width: 0;
  padding: 31px 0;
  display: grid;
  grid-template-columns: minmax(112px, 0.22fr) minmax(0, 1fr) auto;
  align-items: start;
  gap: clamp(20px, 4vw, 52px);
  border-bottom: 1px solid var(--color-border);
}

.ai-tool-band-offset {
  padding-left: clamp(0px, 5vw, 72px);
}

.ai-tool-index {
  padding-top: 7px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.ai-tool-copy {
  min-width: 0;
}

.ai-tool-copy h3 {
  font-size: clamp(23px, 3vw, 31px);
}

.ai-tool-copy p:last-child {
  margin-bottom: 0;
}

.ai-tool-band .badge {
  margin-top: 5px;
  white-space: nowrap;
}

.ai-table-note {
  margin-top: 15px;
  padding: 15px 17px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-sm);
  background: var(--color-panel-deep);
}

.ai-table-note .status-dot {
  margin-top: 0.62em;
}

.ai-table-note p {
  color: var(--color-text-muted);
  font-size: 13px;
}

.ai-process {
  border-left: 1px solid var(--color-border);
}

.ai-process-row {
  min-width: 0;
  padding: 4px 0 36px clamp(28px, 5vw, 66px);
  position: relative;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: clamp(18px, 3vw, 34px);
}

.ai-process-row:last-child {
  padding-bottom: 0;
}

.ai-process-marker {
  width: 44px;
  height: 44px;
  margin-left: calc(clamp(28px, 5vw, 66px) * -1 - 22px);
  display: grid;
  place-items: center;
  border: 1px solid var(--color-accent-dark);
  border-radius: var(--radius-pill);
  background: var(--color-panel-deep);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 12px;
}

.ai-process-row h3 {
  margin-top: 5px;
}

.ai-split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.ai-split-panel {
  min-width: 0;
  padding: clamp(24px, 4vw, 38px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
}

.ai-split-panel:nth-child(even) {
  background: var(--color-panel-raised);
}

.ai-dev-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  gap: 14px;
}

.ai-dev-item {
  min-width: 0;
  padding: clamp(23px, 4vw, 36px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
}

.ai-dev-item:nth-child(2),
.ai-dev-item:nth-child(3) {
  background: var(--color-panel-raised);
}

.ai-dev-item pre {
  margin-top: 24px;
  font-size: 12px;
}

.ai-dev-item .muted {
  font-size: 12px;
}

.ai-failure-list {
  display: grid;
  gap: 10px;
}

.ai-diagnostic {
  margin-top: 28px;
  padding: clamp(24px, 5vw, 42px);
  display: grid;
  grid-template-columns: minmax(200px, 0.7fr) minmax(0, 1.3fr);
  gap: 34px;
  border: 1px solid var(--color-accent-dark);
  border-radius: var(--radius-md);
  background: var(--color-panel-raised);
}

.ai-diagnostic ul {
  margin-bottom: 0;
  color: var(--color-text-muted);
}

.ai-diagnostic li + li {
  margin-top: 9px;
}

.ai-selection-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--color-border);
  background: var(--color-border);
}

.ai-selection-grid section {
  min-width: 0;
  padding: clamp(24px, 4vw, 38px);
  background: var(--color-panel);
}

.ai-selection-grid section:nth-child(2),
.ai-selection-grid section:nth-child(3) {
  background: var(--color-panel-raised);
}

.ai-final-panel {
  margin-top: 38px;
  padding: clamp(28px, 5vw, 48px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 34px;
  border: 1px solid var(--color-accent-dark);
  border-radius: var(--radius-lg);
  background: var(--color-panel-raised);
  box-shadow: var(--shadow-raised);
}

.ai-final-panel h2 {
  margin-bottom: 12px;
  font-size: clamp(30px, 4vw, 44px);
}

.ai-final-panel p {
  max-width: 760px;
  color: var(--color-text-muted);
}

.ai-final-panel .button-row {
  max-width: 390px;
  justify-content: flex-end;
}

@media (max-width: 980px) {
  .ai-hero-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .ai-route-visual {
    width: min(760px, 100%);
  }

  .ai-tool-band {
    grid-template-columns: 100px minmax(0, 1fr);
  }

  .ai-tool-band .badge {
    grid-column: 2;
    width: fit-content;
    margin-top: -8px;
  }

  .ai-tool-band-offset {
    padding-left: 0;
  }

  .ai-dev-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .ai-final-panel {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
  }

  .ai-final-panel .button-row {
    max-width: none;
    justify-content: flex-start;
  }
}

@media (max-width: 768px) {
  .ai-hero {
    padding-top: 48px;
    padding-bottom: 64px;
  }

  .ai-hero-copy .lead {
    font-size: 17px;
  }

  .ai-principle-grid,
  .ai-split,
  .ai-selection-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .ai-principle:nth-child(even),
  .ai-split-panel:nth-child(even),
  .ai-selection-grid section:nth-child(2),
  .ai-selection-grid section:nth-child(3) {
    background: var(--color-panel);
  }

  .ai-principle:nth-child(odd),
  .ai-split-panel:nth-child(odd),
  .ai-selection-grid section:nth-child(odd) {
    background: var(--color-panel-raised);
  }

  .ai-tool-band {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }

  .ai-tool-band .badge {
    grid-column: 1;
    margin-top: 3px;
  }

  .ai-tool-index {
    padding-top: 0;
  }

  .ai-process-row {
    padding-left: 30px;
    grid-template-columns: minmax(0, 1fr);
  }

  .ai-process-marker {
    width: 34px;
    height: 34px;
    margin-left: -47px;
    position: absolute;
    top: 0;
  }

  .ai-process-row h3 {
    margin-top: 0;
  }

  .ai-diagnostic {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }
}

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

  .ai-route-visual {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .ai-visual-body {
    min-width: 620px;
  }

  .ai-document > .wrap-content {
    padding-top: 42px;
  }

  .ai-section {
    padding-top: 58px;
    padding-bottom: 58px;
  }

  .ai-fact-line {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .ai-fact-line span {
    justify-content: center;
    text-align: center;
  }

  .ai-tool-band {
    padding-top: 25px;
    padding-bottom: 25px;
  }

  .ai-dev-item pre {
    padding: 16px;
  }

  .ai-final-panel .button-row {
    width: 100%;
  }

  .ai-final-panel .button {
    width: 100%;
  }
}

@media (max-width: 390px) {
  .ai-fact-line {
    grid-template-columns: minmax(0, 1fr);
  }

  .ai-principle,
  .ai-split-panel,
  .ai-dev-item,
  .ai-selection-grid section {
    padding: 22px 18px;
  }
}