.ai-hero {
  padding-top: 72px;
  padding-bottom: 88px;
  overflow-x: clip;
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-bg);
  background-image: radial-gradient(var(--color-dot) 1px, transparent 1px);
  background-size: 20px 20px;
}

.ai-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  align-items: center;
  gap: 58px;
}

.ai-hero-copy {
  position: relative;
  z-index: 2;
}

.ai-hero-copy h1 {
  margin-top: 22px;
  font-size: clamp(52px, 5vw, 68px);
}

.ai-hero-lede {
  max-width: 540px;
  margin-bottom: 24px;
  color: var(--color-muted);
  font-size: 17px;
  line-height: 1.78;
}

.ai-hero-copy .button-row {
  margin-bottom: 24px;
}

.ai-hero-facts {
  max-width: 580px;
}

.ai-route-panel {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-raised);
}

.ai-route-panel::after {
  position: absolute;
  right: 28px;
  bottom: 46px;
  width: 72px;
  height: 72px;
  border: 1px dashed var(--color-line);
  border-radius: 50%;
  content: "";
  pointer-events: none;
}

.ai-route-chrome {
  display: flex;
  min-height: 54px;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 16px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-panel-alt);
}

.ai-route-title {
  color: var(--color-muted);
  font-size: 12px;
}

.ai-route-canvas {
  min-height: 360px;
  padding: 14px;
  background-color: var(--color-panel);
  background-image: radial-gradient(var(--color-dot) 1px, transparent 1.2px);
  background-position: 8px 8px;
  background-size: 16px 16px;
}

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

.ai-route-candidate {
  fill: none;
  stroke: var(--color-line);
  stroke-dasharray: 5 6;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.5;
}

.ai-route-selected {
  fill: none;
  stroke: var(--color-text);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 4;
}

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

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

.ai-route-node-active {
  fill: var(--color-text);
}

.ai-route-target {
  fill: var(--color-panel);
  stroke: var(--color-text);
  stroke-width: 2;
}

.ai-route-letter {
  font-family: var(--font-display);
  font-size: 22px;
  font-style: italic;
  font-weight: 800;
  text-anchor: middle;
}

.ai-route-letter-light {
  fill: var(--color-panel);
}

.ai-route-svg-label,
.ai-route-target-label {
  fill: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  text-anchor: middle;
}

.ai-route-target-label {
  fill: var(--color-text);
  font-size: 11px;
  font-weight: 800;
}

.ai-route-footer {
  display: flex;
  min-height: 48px;
  align-items: center;
  gap: 18px;
  padding: 10px 16px;
  border-top: 1px solid var(--color-border);
  background: var(--color-panel-alt);
  color: var(--color-muted);
  font-size: 12px;
}

.ai-route-footer span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.ai-route-footer .mono {
  margin-left: auto;
  color: var(--color-text);
}

.ai-line {
  display: inline-block;
  width: 24px;
  height: 0;
}

.ai-line-dashed {
  border-top: 1px dashed var(--color-line);
}

.ai-line-solid {
  border-top: 3px solid var(--color-text);
}

.ai-principle-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 16px;
}

.ai-principle-card {
  position: relative;
  min-height: 320px;
  grid-column: span 7;
  padding: 30px 84px 30px 30px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-panel);
  transform-style: preserve-3d;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.ai-principle-card:nth-child(even) {
  grid-column: span 5;
}

.ai-principle-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-raised);
}

.ai-principle-card h3 {
  margin-top: 22px;
  font-size: 28px;
}

.ai-principle-card p {
  max-width: 570px;
  color: var(--color-muted);
}

.ai-principle-alt {
  background: var(--color-panel-alt);
}

.ai-principle-dark {
  border-color: var(--color-text);
  background: var(--color-text);
  color: var(--color-panel);
}

.ai-principle-dark h3,
.ai-principle-dark p {
  color: var(--color-panel);
}

.ai-card-icon {
  position: absolute;
  right: 28px;
  bottom: 28px;
  width: 42px;
  height: 42px;
  padding: 9px;
  border: 1px solid currentColor;
  border-radius: 50%;
}

.ai-tool-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.ai-tool-card {
  min-height: 300px;
  padding: 26px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.ai-tool-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-panel);
}

.ai-tool-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
}

.ai-tool-head h3 {
  margin-bottom: 3px;
  font-size: 22px;
}

.ai-tool-head p {
  margin-bottom: 0;
  color: var(--color-muted);
  font-size: 10px;
  letter-spacing: .05em;
}

.ai-tool-mark {
  display: inline-flex;
  width: 48px;
  height: 48px;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border: 1px solid var(--color-text);
  border-radius: var(--radius-sm);
  background: var(--color-text);
  color: var(--color-panel);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 800;
}

.ai-tool-card > p {
  color: var(--color-muted);
  line-height: 1.78;
}

.ai-comparison-table td:first-child {
  white-space: nowrap;
}

.ai-reading-layout {
  max-width: calc(var(--reading-width) + var(--gutter) * 2);
}

.ai-reading-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.ai-reading-card {
  padding: 26px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
}

.ai-reading-card h3 {
  font-size: 23px;
}

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

.ai-path-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.ai-path-card {
  min-height: 390px;
  padding: 30px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-panel);
}

.ai-path-card h3 {
  margin-top: 28px;
}

.ai-path-card p {
  color: var(--color-muted);
}

.ai-path-dark {
  border-color: var(--color-text);
  background: var(--color-text);
  color: var(--color-panel);
}

.ai-path-dark h3,
.ai-path-dark p {
  color: var(--color-panel);
}

.ai-path-dark .tag {
  border-color: var(--color-panel-alt);
  background: transparent;
  color: var(--color-panel);
}

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

.ai-dev-list article {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 26px;
  padding-top: 28px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--color-border);
}

.ai-dev-key {
  color: var(--color-accent-ink);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .08em;
}

.ai-dev-list h3 {
  font-size: 23px;
}

.ai-dev-list p {
  max-width: 790px;
  margin-bottom: 0;
  color: var(--color-muted);
}

.ai-failure-list {
  max-width: 940px;
}

.ai-more-help {
  margin-top: 28px;
  margin-bottom: 0;
}

.ai-more-help a {
  color: var(--color-accent-ink);
  font-weight: 750;
}

.ai-selection-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 44px;
  padding: 42px;
  border: 1px solid var(--color-text);
  border-radius: var(--radius-md);
  background: var(--color-text);
  color: var(--color-panel);
  box-shadow: var(--shadow-raised);
}

.ai-selection-copy {
  max-width: 820px;
}

.ai-selection-copy h2,
.ai-selection-copy p {
  color: var(--color-panel);
}

.ai-selection-copy .eyebrow {
  color: var(--color-panel-alt);
}

.ai-selection-copy .eyebrow::before {
  background: var(--color-accent);
}

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

.ai-selection-actions {
  display: flex;
  min-width: 190px;
  flex-direction: column;
  gap: 12px;
}

.ai-selection-actions .btn-dark {
  border-color: var(--color-panel);
  background: transparent;
}

.ai-selection-actions .btn-dark:hover {
  background: var(--color-panel);
  color: var(--color-text);
}

@media (max-width: 1040px) {
  .ai-hero-grid {
    grid-template-columns: 1fr;
  }

  .ai-hero-copy {
    max-width: 760px;
  }

  .ai-route-panel {
    max-width: 820px;
  }

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

  .ai-selection-panel {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .ai-selection-actions {
    width: 100%;
    max-width: 440px;
    flex-direction: row;
  }

  .ai-selection-actions .btn {
    flex: 1 1 0;
  }
}

@media (max-width: 768px) {
  .ai-hero {
    padding-top: 48px;
    padding-bottom: 60px;
  }

  .ai-hero-grid {
    gap: 36px;
  }

  .ai-hero-copy h1 {
    font-size: clamp(32px, 9.2vw, 40px);
  }

  .ai-route-canvas {
    min-height: 0;
    padding: 8px;
  }

  .ai-route-panel::after {
    display: none;
  }

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

  .ai-principle-card,
  .ai-principle-card:nth-child(even) {
    min-height: 290px;
    grid-column: auto;
  }

  .ai-tool-grid,
  .ai-reading-grid,
  .ai-path-grid {
    grid-template-columns: 1fr;
  }

  .ai-tool-card,
  .ai-path-card {
    min-height: 0;
  }

  .ai-dev-list article {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .ai-selection-panel {
    padding: 30px;
  }
}

@media (max-width: 520px) {
  .ai-route-chrome {
    align-items: flex-start;
    flex-direction: column;
  }

  .ai-route-footer {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .ai-route-footer .mono {
    width: 100%;
    margin-left: 0;
  }

  .ai-principle-card {
    padding: 24px 68px 24px 24px;
  }

  .ai-tool-card,
  .ai-reading-card,
  .ai-path-card {
    padding: 22px;
  }

  .ai-selection-panel {
    padding: 24px;
  }

  .ai-selection-actions {
    flex-direction: column;
  }

  .ai-selection-actions .btn {
    width: 100%;
  }
}