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

.ai-hero {
  padding-top: 64px;
  padding-bottom: 72px;
  border-bottom: 1px solid var(--color-line);
  background: var(--color-canvas);
}

.ai-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(420px, .82fr);
  gap: 64px;
  align-items: center;
}

.ai-hero-copy .lead {
  margin-bottom: 26px;
}

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

.ai-trust-line {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  padding-top: 20px;
  border-top: 1px solid var(--color-line);
  color: var(--color-muted);
  font-size: 13px;
  font-weight: 650;
}

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

.ai-trust-line span::before {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  content: "";
}

.ai-flow-board {
  overflow: hidden;
  border-radius: var(--radius-board);
  background: var(--color-route);
  box-shadow: var(--shadow-board);
}

.ai-flow-strip {
  height: 4px;
  background: var(--color-accent);
}

.ai-flow-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 20px 26px;
  color: var(--color-white-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
}

.ai-flow-state {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-accent);
  font-family: var(--font-body);
  font-weight: 700;
  letter-spacing: 0;
}

.ai-flow-state .status-dot {
  box-shadow: none;
}

.ai-flow-row {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) auto;
  gap: 18px;
  align-items: center;
  padding: 24px 26px;
  border-top: 1px solid var(--color-white-faint);
  transition: background-color var(--motion-fast) ease;
}

.ai-flow-row:hover {
  background: var(--color-white-hover);
}

.ai-flow-code {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
}

.ai-flow-row strong {
  display: block;
  color: var(--color-white);
  font-size: 17px;
}

.ai-flow-row small {
  display: block;
  margin-top: 3px;
  color: var(--color-white-soft);
  font-size: 13px;
}

.ai-flow-arrow {
  color: var(--color-white);
  font-size: 24px;
  transition: color var(--motion-fast) ease, transform var(--motion-fast) ease;
}

.ai-flow-row:hover .ai-flow-arrow {
  color: var(--color-accent);
  transform: translateX(4px);
}

.ai-toc-wrap {
  position: relative;
  z-index: 20;
  padding-top: 22px;
}

.ai-toc-wrap .toc-tabs {
  top: 10px;
}

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

.ai-principle {
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr);
  gap: 30px;
  padding-top: 30px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--color-line);
}

.ai-principle-code {
  padding-top: 5px;
  color: var(--color-route);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: .08em;
}

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

.ai-principle p {
  max-width: 900px;
  margin-bottom: 0;
  color: var(--color-muted);
}

.ai-table-note {
  max-width: 920px;
  margin-top: 20px;
  color: var(--color-muted);
  font-size: 14px;
}

.ai-reading {
  max-width: 1040px;
}

.ai-guidance-list {
  margin-top: 40px;
  border-top: 3px solid var(--color-accent);
}

.ai-guidance-list article {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  gap: 28px;
  padding-top: 28px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--color-line);
}

.ai-guidance-label {
  color: var(--color-route);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: .08em;
}

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

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

.ai-channel-compare {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 3px solid var(--color-accent);
  border-bottom: 1px solid var(--color-line);
}

.ai-channel-compare article {
  padding: 32px;
  border-left: 1px solid var(--color-line);
  background: var(--color-canvas);
}

.ai-channel-compare article:last-child {
  border-right: 1px solid var(--color-line);
}

.ai-channel-compare .badge {
  margin-bottom: 20px;
}

.ai-channel-compare h3 {
  font-size: 23px;
}

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

.ai-dev-rows {
  border-top: 3px solid var(--color-accent);
}

.ai-dev-rows article {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  gap: 28px;
  padding-top: 30px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--color-line);
}

.ai-dev-code {
  display: inline-flex;
  width: 72px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--color-route);
  color: var(--color-white);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
}

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

.ai-dev-rows p {
  max-width: 920px;
  margin-bottom: 0;
  color: var(--color-muted);
}

.ai-route-list .route-number {
  font-size: 11px;
}

.ai-next-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 48px;
  border-top: 3px solid var(--color-accent);
}

.ai-next-links a {
  position: relative;
  display: grid;
  gap: 7px;
  padding: 28px 54px 28px 28px;
  border-bottom: 1px solid var(--color-line);
  border-left: 1px solid var(--color-line);
  background: var(--color-canvas);
  transition: background-color var(--motion-fast) ease;
}

.ai-next-links a:last-child {
  border-right: 1px solid var(--color-line);
}

.ai-next-links a:hover {
  background: var(--color-panel);
}

.ai-next-links .mono {
  color: var(--color-route);
  font-size: 11px;
  font-weight: 750;
  letter-spacing: .08em;
}

.ai-next-links strong {
  font-family: var(--font-display);
  font-size: 22px;
}

.ai-next-links p {
  margin-bottom: 0;
  color: var(--color-muted);
  font-size: 14px;
}

.ai-next-links a > span:last-child {
  position: absolute;
  top: 50%;
  right: 24px;
  color: var(--color-route);
  font-size: 24px;
  transform: translateY(-50%);
  transition: color var(--motion-fast) ease, transform var(--motion-fast) ease;
}

.ai-next-links a:hover > span:last-child {
  color: var(--color-accent);
  transform: translate(4px, -50%);
}

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

  .ai-flow-board {
    width: min(100%, 720px);
  }
}

@media (max-width: 768px) {
  .ai-hero {
    padding-top: 44px;
    padding-bottom: 56px;
  }

  .ai-hero-grid {
    gap: 42px;
  }

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

  .ai-channel-compare,
  .ai-next-links {
    grid-template-columns: 1fr;
  }

  .ai-channel-compare article,
  .ai-channel-compare article:last-child,
  .ai-next-links a,
  .ai-next-links a:last-child {
    border-right: 1px solid var(--color-line);
  }
}

@media (max-width: 640px) {
  .ai-flow-head,
  .ai-flow-row {
    padding-inline: 18px;
  }

  .ai-flow-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .ai-flow-row {
    grid-template-columns: 58px minmax(0, 1fr) auto;
    gap: 11px;
  }

  .ai-flow-code {
    font-size: 10px;
  }

  .ai-flow-row strong {
    font-size: 15px;
  }

  .ai-flow-row small {
    font-size: 12px;
  }

  .ai-channel-compare article {
    padding: 24px 20px;
  }

  .ai-dev-rows article {
    grid-template-columns: 58px minmax(0, 1fr);
    gap: 15px;
  }

  .ai-dev-code {
    width: 58px;
  }

  .ai-next-links a {
    padding: 24px 48px 24px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ai-flow-row:hover .ai-flow-arrow,
  .ai-next-links a:hover > span:last-child {
    transform: none;
  }
}