.ai-hero {
  position: relative;
  overflow-x: clip;
  border-bottom: 1px solid var(--line-soft);
}

.ai-hero::before {
  position: absolute;
  inset: 0;
  pointer-events: none;
  content: "";
  background:
    radial-gradient(circle at 84% 78%, var(--twilight-glow), transparent 30rem),
    linear-gradient(180deg, var(--color-bg), var(--color-bg-soft));
}

.ai-hero-grid {
  position: relative;
  display: grid;
  min-height: calc(100svh - var(--header-height));
  grid-template-columns: minmax(0, 0.92fr) minmax(460px, 1.08fr);
  align-items: center;
  gap: clamp(38px, 6vw, 82px);
  padding-top: clamp(54px, 8vw, 96px);
  padding-bottom: clamp(64px, 9vw, 112px);
}

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

.ai-hero-copy .eyebrow {
  margin-bottom: 21px;
}

.ai-route-board {
  position: relative;
  z-index: 1;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-low), var(--shadow-mid), var(--shadow-high);
  transform: rotate(-1deg);
}

.ai-route-board::after {
  position: absolute;
  inset: 0;
  pointer-events: none;
  border-radius: inherit;
  content: "";
  box-shadow: var(--shadow-inner);
}

.ai-board-head,
.ai-board-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px 17px;
  border-bottom: 1px solid var(--line-medium);
  background: var(--color-panel-strong);
}

.ai-board-title {
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.ai-route-stack {
  padding: clamp(22px, 5vw, 46px);
  background:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px),
    var(--color-panel-raised);
  background-size: 28px 28px;
}

.ai-route-step {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  align-items: center;
  gap: 17px;
  padding: 19px;
  border: 1px solid var(--line-medium);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  box-shadow: var(--shadow-low);
}

.ai-route-step.is-accent {
  border-color: var(--accent-line);
  background: linear-gradient(90deg, var(--accent-soft), var(--color-panel));
  box-shadow: var(--shadow-mid);
}

.ai-route-code {
  color: var(--color-accent-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.ai-route-step strong {
  display: block;
  color: var(--color-text);
  font-size: 16px;
}

.ai-route-step p {
  margin: 3px 0 0;
  color: var(--color-text-muted);
  font-size: 13px;
  line-height: 1.6;
}

.ai-route-link {
  position: relative;
  width: 1px;
  height: 30px;
  margin-inline: auto;
  border-left: 1px dashed var(--color-accent);
}

.ai-route-link i {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 7px;
  height: 7px;
  border: 2px solid var(--color-panel);
  border-radius: 50%;
  background: var(--color-accent);
  transform: translate(-50%, -50%);
}

.ai-board-foot {
  border-top: 1px solid var(--line-medium);
  border-bottom: 0;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
}

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

.ai-signal {
  grid-column: span 4;
  min-width: 0;
  padding: 25px;
  border-top: 3px solid var(--color-accent);
  border-right: 1px solid var(--line-medium);
  border-bottom: 1px solid var(--line-medium);
  border-left: 1px solid var(--line-medium);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  box-shadow: var(--shadow-low);
}

.ai-signal:nth-child(2),
.ai-signal:nth-child(5) {
  transform: translateY(18px);
}

.ai-signal h3 {
  margin-top: 11px;
  font-size: 23px;
}

.ai-signal p {
  color: var(--color-text-soft);
}

.ai-soft-section {
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  background: var(--color-bg-soft);
}

.ai-stage-list {
  position: relative;
  display: grid;
  max-width: 960px;
  gap: 0;
  margin-inline: auto;
}

.ai-stage-list::before {
  position: absolute;
  top: 34px;
  bottom: 34px;
  left: 27px;
  border-left: 1px dashed var(--color-accent);
  content: "";
}

.ai-stage {
  position: relative;
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 22px;
  padding: 22px 0;
}

.ai-stage-mark {
  position: relative;
  z-index: 1;
  display: grid;
  width: 56px;
  height: 56px;
  place-items: center;
  border: 1px solid var(--accent-line);
  border-radius: 50%;
  background: var(--color-panel);
  color: var(--color-accent-strong);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 800;
  box-shadow: var(--shadow-low);
}

.ai-stage h3 {
  margin-bottom: 7px;
}

.ai-stage p {
  color: var(--color-text-soft);
}

.ai-tool-dossiers {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  overflow: hidden;
  border: 1px solid var(--line-medium);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-low);
}

.ai-tool-dossier {
  min-width: 0;
  padding: clamp(23px, 4vw, 36px);
  border-bottom: 1px solid var(--line-medium);
}

.ai-tool-dossier:nth-child(odd) {
  border-right: 1px solid var(--line-medium);
}

.ai-tool-dossier:nth-last-child(-n + 2) {
  border-bottom: 0;
}

.ai-tool-name {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 11px;
  margin-bottom: 13px;
}

.ai-tool-name h3 {
  margin: 0;
}

.ai-tool-dossier p {
  color: var(--color-text-soft);
}

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

.ai-channel {
  padding: clamp(24px, 4vw, 38px);
}

.ai-channel h3 {
  margin-top: 12px;
}

.ai-channel p,
.ai-channel li {
  color: var(--color-text-soft);
}

.ai-channel ul {
  display: grid;
  gap: 9px;
  margin-top: 22px;
}

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

.ai-dev-card {
  min-height: 100%;
}

.ai-dev-card h3 {
  margin-top: 18px;
}

.ai-dev-card p {
  color: var(--color-text-soft);
}

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

.ai-diagnostics article {
  min-width: 0;
  padding: clamp(22px, 4vw, 34px);
  border-right: 1px solid var(--line-medium);
  border-bottom: 1px solid var(--line-medium);
  background: var(--color-panel);
}

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

.ai-diagnostics p {
  color: var(--color-text-soft);
}

.ai-choice-section {
  padding-top: var(--section-space);
  padding-bottom: var(--section-space);
  border-top: 1px solid var(--accent-line);
  background:
    radial-gradient(circle at 88% 88%, var(--twilight-glow), transparent 25rem),
    var(--color-panel-raised);
}

.ai-choice-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(340px, 0.88fr);
  align-items: start;
  gap: clamp(36px, 7vw, 88px);
}

.ai-choice-layout .section-title {
  margin-top: 18px;
}

.ai-choice-layout p {
  color: var(--color-text-soft);
}

.ai-choice-layout .button-row {
  margin-top: 28px;
}

.ai-choice-links {
  display: grid;
  gap: 12px;
}

.ai-choice-link {
  display: flex;
  min-height: 86px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 20px;
  border: 1px solid var(--line-medium);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  color: var(--color-text);
  text-decoration: none;
  box-shadow: var(--shadow-low);
  transition:
    transform var(--duration-fast) var(--ease-standard),
    border-color var(--duration-fast) var(--ease-standard),
    box-shadow var(--duration-fast) var(--ease-standard);
}

.ai-choice-link:hover {
  border-color: var(--color-accent);
  color: var(--color-text);
  box-shadow: var(--shadow-mid);
  transform: translateY(-2px);
}

.ai-choice-link small,
.ai-choice-link strong {
  display: block;
}

.ai-choice-link small {
  margin-bottom: 3px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
}

.ai-choice-link strong {
  font-size: 17px;
}

.ai-fact-note {
  padding: 21px;
  border: 1px solid var(--accent-line);
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
}

.ai-fact-note p {
  margin-top: 12px;
  font-size: 14px;
}

@media (max-width: 1020px) {
  .ai-hero-grid {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .ai-route-board {
    transform: none;
  }

  .ai-signal {
    grid-column: span 6;
  }

  .ai-signal:nth-child(2),
  .ai-signal:nth-child(5) {
    transform: none;
  }

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

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

@media (max-width: 760px) {
  .ai-signal-grid,
  .ai-tool-dossiers,
  .ai-dual-panel,
  .ai-diagnostics {
    grid-template-columns: 1fr;
  }

  .ai-signal {
    grid-column: auto;
  }

  .ai-tool-dossier,
  .ai-tool-dossier:nth-child(odd),
  .ai-tool-dossier:nth-last-child(-n + 2) {
    border-right: 0;
    border-bottom: 1px solid var(--line-medium);
  }

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

  .ai-diagnostics {
    border-left: 0;
  }

  .ai-diagnostics article {
    border-left: 1px solid var(--line-medium);
  }
}

@media (max-width: 640px) {
  .ai-route-stack {
    padding: 18px;
  }

  .ai-route-step {
    grid-template-columns: 1fr;
    gap: 7px;
    padding: 16px;
  }

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

  .ai-stage {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 16px;
  }

  .ai-stage-mark {
    width: 44px;
    height: 44px;
  }

  .ai-stage-list::before {
    left: 21px;
  }

  .ai-choice-link {
    min-height: 78px;
    padding-inline: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ai-route-board,
  .ai-signal:nth-child(2),
  .ai-signal:nth-child(5) {
    transform: none;
  }
}