.ai-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
  background:
    linear-gradient(to bottom, var(--color-canvas), var(--color-surface-soft));
}

.ai-hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 0.96fr) minmax(440px, 1.04fr);
  gap: 64px;
  align-items: center;
  min-height: calc(100svh - var(--header-height));
  padding-top: 70px;
  padding-bottom: 76px;
}

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

.ai-hero-title {
  max-width: 690px;
  margin-top: 24px;
  margin-bottom: 0;
  font-size: clamp(52px, 5vw, 68px);
}

.ai-hero-actions {
  margin-top: 30px;
}

.ai-hero-lead {
  margin-top: 23px;
  margin-bottom: 0;
}

.ai-hero-lead strong {
  color: var(--color-ink);
}

.ai-fact-row {
  margin-top: 24px;
}

.ai-hero-grid {
  position: absolute;
  right: -8%;
  bottom: -22%;
  z-index: 0;
  width: 58%;
  aspect-ratio: 1;
  border-radius: var(--radius-pill);
  background-image:
    linear-gradient(var(--color-paper-noise) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-paper-noise) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: radial-gradient(circle, var(--color-ink), transparent 68%);
  opacity: 0.9;
}

.ai-route-board {
  position: relative;
  z-index: 2;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}

.ai-route-board::before {
  position: absolute;
  inset: 43px 0 43px;
  pointer-events: none;
  background-image:
    linear-gradient(var(--color-paper-noise) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-paper-noise) 1px, transparent 1px);
  background-size: 25px 25px;
  content: "";
}

.ai-board-chrome {
  position: relative;
  z-index: 1;
  display: flex;
  min-height: 43px;
  align-items: center;
  gap: 7px;
  padding-inline: 16px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface-soft);
}

.ai-chrome-dot {
  width: 9px;
  height: 9px;
  flex-shrink: 0;
  border-radius: var(--radius-pill);
  background: var(--color-ink-muted);
}

.ai-chrome-dot:nth-child(2) {
  opacity: 0.55;
}

.ai-chrome-dot:nth-child(3) {
  opacity: 0.3;
}

.ai-board-title {
  margin-left: 8px;
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.ai-board-body {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 86px minmax(180px, 1fr) 86px;
  gap: 20px;
  align-items: center;
  min-height: 386px;
  padding: 38px 28px;
}

.ai-origin {
  display: grid;
  justify-items: center;
  gap: 9px;
  color: var(--color-ink-muted);
  font-size: 11px;
  text-align: center;
}

.ai-origin-mark {
  display: inline-flex;
  width: 48px;
  height: 48px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-accent-deep);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
  box-shadow: 0 0 0 8px var(--color-surface-soft);
}

.ai-route-stack {
  display: grid;
  gap: 62px;
}

.ai-route-line {
  position: relative;
  height: 28px;
}

.ai-route-line::before,
.ai-route-line::after,
.ai-route-bend {
  position: absolute;
  height: 2px;
  content: "";
}

.ai-route-line::before {
  top: 17px;
  right: 51%;
  left: 0;
  transform: rotate(-7deg);
  transform-origin: right center;
}

.ai-route-line::after {
  top: 17px;
  right: 0;
  left: 51%;
  transform: rotate(7deg);
  transform-origin: left center;
}

.ai-route-line.is-muted::before,
.ai-route-line.is-muted::after {
  border-top: 2px dashed var(--color-route-muted);
}

.ai-route-line.is-selected::before,
.ai-route-line.is-selected::after {
  height: 4px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  box-shadow: 0 4px 12px var(--color-button-shadow);
}

.ai-route-bend {
  top: 8px;
  left: calc(50% - 7px);
  width: 14px;
  height: 14px;
  border: 3px solid var(--color-route-muted);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
}

.ai-route-line.is-selected .ai-route-bend {
  border-color: var(--color-accent);
}

.ai-route-start,
.ai-route-end {
  position: absolute;
  top: 13px;
  z-index: 2;
  width: 10px;
  height: 10px;
  border: 2px solid var(--color-route-muted);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
}

.ai-route-start {
  left: -2px;
}

.ai-route-end {
  right: -2px;
}

.ai-route-line.is-selected .ai-route-start,
.ai-route-line.is-selected .ai-route-end {
  border-color: var(--color-accent);
  background: var(--color-accent);
}

.ai-targets {
  display: grid;
  gap: 15px;
}

.ai-targets span {
  display: inline-flex;
  min-height: 32px;
  align-items: center;
  justify-content: center;
  padding: 5px 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  background: var(--color-surface);
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: 10px;
}

.ai-targets span:first-child {
  border-color: var(--color-accent);
  color: var(--color-accent-deep);
  font-weight: 750;
}

.ai-board-footer {
  position: relative;
  z-index: 1;
  display: flex;
  min-height: 43px;
  align-items: center;
  gap: 20px;
  padding-inline: 17px;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

.ai-board-key {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--color-ink-muted);
  font-size: 11px;
}

.ai-key-line {
  width: 24px;
  border-top: 2px dashed var(--color-route-muted);
}

.ai-key-line.is-active {
  border-top: 4px solid var(--color-accent);
}

.ai-guide {
  position: relative;
}

.ai-section {
  padding-top: 88px;
  padding-bottom: 24px;
}

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

.ai-section-heading {
  max-width: 820px;
  margin-bottom: 34px;
}

.ai-section-heading > p:not(.eyebrow):not(.lead) {
  color: var(--color-ink-muted);
  font-size: 17px;
}

.ai-requirement-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.ai-requirement {
  min-width: 0;
  padding: 26px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
}

.ai-requirement-code {
  display: block;
  margin-bottom: 18px;
  color: var(--color-accent-deep);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 750;
  letter-spacing: 0.09em;
}

.ai-requirement h3 {
  font-size: 21px;
}

.ai-requirement p {
  color: var(--color-ink-muted);
}

.ai-callout {
  max-width: 920px;
  margin-top: 26px;
}

.ai-tool-table {
  min-width: 850px;
}

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

.ai-note-row {
  display: grid;
  grid-template-columns: minmax(110px, 0.28fr) minmax(0, 1.72fr);
  gap: 40px;
  padding-top: 30px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--color-border);
}

.ai-note-index {
  padding-top: 5px;
  color: var(--color-accent-deep);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.08em;
}

.ai-note-row h3 {
  font-size: 23px;
}

.ai-note-row p {
  max-width: 850px;
  color: var(--color-ink-muted);
}

.ai-two-column {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
  gap: 42px;
  align-items: start;
}

.ai-check-panel {
  position: sticky;
  top: calc(var(--header-height) + 76px);
  padding: 26px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface-soft);
}

.ai-check-title {
  margin-bottom: 18px;
  color: var(--color-accent-deep);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.08em;
}

.ai-check-list {
  display: grid;
  gap: 13px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.ai-check-list li {
  position: relative;
  padding-left: 24px;
}

.ai-check-list li::before {
  position: absolute;
  top: 8px;
  left: 0;
  width: 9px;
  height: 9px;
  border: 2px solid var(--color-success);
  border-radius: var(--radius-pill);
  content: "";
}

.ai-compare {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.ai-compare-panel {
  padding: 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.ai-compare-panel.is-accent {
  border-color: var(--color-accent);
  background: var(--color-surface-soft);
}

.ai-compare-panel h3 {
  margin-top: 20px;
}

.ai-compare-panel p {
  color: var(--color-ink-muted);
}

.ai-workflow {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--color-border);
}

.ai-workflow-item {
  display: grid;
  grid-template-columns: 90px minmax(0, 1fr);
  gap: 30px;
  padding-top: 30px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--color-border);
}

.ai-workflow-marker {
  display: inline-flex;
  width: 64px;
  height: 38px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  background: var(--color-surface);
  color: var(--color-accent-deep);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 750;
}

.ai-workflow-item p {
  max-width: 850px;
  color: var(--color-ink-muted);
}

.ai-diagnostics {
  background: var(--color-surface);
}

.ai-diagnostics .faq-item {
  padding-inline: 22px;
}

.ai-decision-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(310px, 0.82fr);
  gap: 44px;
  align-items: start;
}

.ai-decision-panel {
  padding: 30px;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-md);
  background: var(--color-surface-soft);
  box-shadow: var(--shadow-card);
}

.ai-decision-label {
  margin-bottom: 15px;
  color: var(--color-accent-deep);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 750;
  letter-spacing: 0.09em;
}

.ai-decision-panel > p:not(.ai-decision-label) {
  color: var(--color-ink-muted);
}

.ai-link-stack {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

.ai-link-stack .button {
  width: 100%;
}

.ai-decision-footnote {
  margin-top: 18px;
  font-size: 13px;
}

@media (max-width: 1080px) {
  .ai-hero-inner {
    grid-template-columns: 1fr;
    min-height: 0;
  }

  .ai-hero-copy {
    max-width: 780px;
  }

  .ai-route-board {
    max-width: 780px;
  }

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

@media (max-width: 820px) {
  .ai-two-column,
  .ai-compare,
  .ai-decision-grid {
    grid-template-columns: 1fr;
  }

  .ai-check-panel {
    position: static;
  }
}

@media (max-width: 768px) {
  .ai-hero-inner {
    gap: 42px;
    padding-top: 46px;
    padding-bottom: 54px;
  }

  .ai-hero-title {
    font-size: clamp(34px, 10vw, 40px);
  }

  .ai-hero-grid {
    display: none;
  }

  .ai-route-board {
    width: 100%;
  }

  .ai-board-body {
    grid-template-columns: 64px minmax(120px, 1fr) 72px;
    gap: 12px;
    min-height: 320px;
    padding: 26px 14px;
  }

  .ai-route-stack {
    gap: 48px;
  }

  .ai-targets {
    gap: 10px;
  }

  .ai-section {
    padding-top: 70px;
  }

  .ai-note-row {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .ai-workflow-item {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}

@media (max-width: 520px) {
  .ai-board-title {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .ai-board-body {
    grid-template-columns: 50px minmax(90px, 1fr) 62px;
    gap: 8px;
    min-height: 286px;
    padding-inline: 8px;
  }

  .ai-origin-mark {
    width: 40px;
    height: 40px;
    box-shadow: 0 0 0 5px var(--color-surface-soft);
  }

  .ai-origin > span:last-child {
    display: none;
  }

  .ai-route-stack {
    gap: 42px;
  }

  .ai-targets span {
    padding-inline: 4px;
    font-size: 8px;
  }

  .ai-board-footer {
    flex-wrap: wrap;
    gap: 10px 16px;
    padding-top: 9px;
    padding-bottom: 9px;
  }

  .ai-requirement,
  .ai-compare-panel,
  .ai-decision-panel {
    padding: 21px;
  }

  .ai-diagnostics .faq-item {
    padding-inline: 14px;
  }
}