:root {
  --ai-board-grid: var(--color-line-soft);
  --ai-route-secondary: var(--color-muted);
  --ai-route-surface: var(--color-canvas);
  --ai-route-core: var(--color-accent);
}

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

.ai-hero::before {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--color-accent-faint) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-accent-faint) 1px, transparent 1px);
  background-size: 48px 48px;
  content: "";
  pointer-events: none;
}

.ai-hero-layout {
  position: relative;
  display: grid;
  min-height: calc(100svh - var(--header-height));
  grid-template-columns: minmax(0, 1fr) minmax(420px, 0.82fr);
  align-items: center;
  gap: 72px;
  padding-top: 80px;
  padding-bottom: 80px;
}

.ai-hero-copy {
  position: relative;
  z-index: 2;
  min-width: 0;
}

.ai-hero-copy h1 {
  max-width: 760px;
  margin-top: 25px;
  margin-bottom: 22px;
}

.ai-hero-lead {
  max-width: 720px;
  margin-bottom: 0;
  color: var(--color-muted);
  font-size: clamp(18px, 2vw, 21px);
  line-height: 1.75;
}

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

.ai-hero-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-top: 24px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

.ai-hero-trust span {
  position: relative;
  padding-left: 13px;
}

.ai-hero-trust span::before {
  position: absolute;
  top: 0.68em;
  left: 0;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-accent);
  content: "";
}

.ai-route-board {
  position: relative;
  z-index: 2;
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-large);
  background: var(--color-canvas);
  box-shadow: var(--shadow-raised);
}

.ai-route-head,
.ai-route-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  color: var(--color-muted);
  font-size: 12px;
}

.ai-route-head {
  min-height: 56px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--color-line);
}

.ai-route-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
}

.ai-route-canvas {
  position: relative;
  min-height: 300px;
  overflow: hidden;
  background:
    linear-gradient(var(--ai-board-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--ai-board-grid) 1px, transparent 1px),
    var(--color-panel);
  background-size: 28px 28px;
}

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

.ai-route-line,
.ai-route-branch {
  fill: none;
  stroke: var(--color-accent);
  stroke-linecap: round;
  stroke-linejoin: round;
}

.ai-route-line {
  stroke-width: 3;
}

.ai-route-line-muted {
  stroke: var(--ai-route-secondary);
  stroke-width: 2;
  opacity: 0.45;
}

.ai-route-branch {
  stroke-width: 2;
  stroke-dasharray: 5 7;
}

.ai-route-node,
.ai-route-core {
  stroke: var(--color-accent);
  stroke-width: 3;
}

.ai-route-node {
  fill: var(--ai-route-surface);
}

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

.ai-node-label {
  position: absolute;
  padding: 3px 7px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-small);
  background: var(--color-canvas);
  color: var(--color-muted);
  box-shadow: var(--shadow-soft);
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1.4;
  white-space: nowrap;
}

.ai-node-local {
  top: 45%;
  left: 4%;
}

.ai-node-web {
  top: 10%;
  left: 31%;
}

.ai-node-api {
  bottom: 9%;
  left: 32%;
}

.ai-node-route {
  top: 42%;
  left: 61%;
  color: var(--color-accent-dark);
}

.ai-node-service {
  top: 10%;
  right: 3%;
}

.ai-node-dev {
  right: 3%;
  bottom: 9%;
}

.ai-route-foot {
  justify-content: flex-start;
  flex-wrap: wrap;
  padding: 14px 18px;
  border-top: 1px solid var(--color-line);
  font-family: var(--font-mono);
}

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

.ai-route-foot span::before {
  width: 5px;
  height: 5px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--color-success);
  content: "";
}

.ai-guide {
  padding-top: 72px;
}

.ai-section {
  padding-top: 96px;
  padding-bottom: 96px;
  border-bottom: 1px solid var(--color-line);
}

.ai-section-heading {
  max-width: 850px;
  margin-bottom: 44px;
}

.ai-principle-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.ai-principle {
  min-width: 0;
  padding: 28px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-medium);
  background: var(--color-panel);
}

.ai-principle-code,
.ai-flow-label {
  display: block;
  margin-bottom: 20px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: lowercase;
}

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

.ai-principle p,
.ai-tool-row p,
.ai-check-flow p,
.ai-dev-card p,
.ai-selection-copy p {
  margin-bottom: 0;
  color: var(--color-muted);
}

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

.ai-tool-row {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr) auto;
  align-items: start;
  gap: 24px;
  padding-top: 30px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--color-line);
}

.ai-tool-mark {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-small);
  background: var(--color-accent-soft);
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
}

.ai-tool-row h3 {
  margin-bottom: 8px;
  font-size: 22px;
}

.ai-matrix {
  min-width: 860px;
}

.ai-check-flow {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border: 1px solid var(--color-line);
  border-radius: var(--radius-medium);
  background: var(--color-canvas);
  box-shadow: var(--shadow-soft);
}

.ai-check-flow article {
  min-width: 0;
  padding: 30px;
}

.ai-check-flow article + article {
  border-left: 1px solid var(--color-line);
}

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

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

.ai-compare-panel {
  min-width: 0;
  padding: 34px;
  background: var(--color-canvas);
}

.ai-compare-panel + .ai-compare-panel {
  border-left: 1px solid var(--color-line);
}

.ai-compare-panel-strong {
  background: var(--color-panel);
}

.ai-compare-panel ul {
  display: grid;
  gap: 14px;
  margin-bottom: 0;
  color: var(--color-muted);
}

.ai-dev-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.ai-dev-card {
  display: flex;
  min-width: 0;
  min-height: 100%;
  flex-direction: column;
  padding: 28px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-medium);
  background: var(--color-canvas);
  box-shadow: var(--shadow-soft);
}

.ai-dev-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.ai-dev-head h3 {
  margin-bottom: 0;
  font-size: 21px;
}

.ai-dev-symbol {
  display: grid;
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
  place-items: center;
  border-radius: var(--radius-small);
  background: var(--color-panel);
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
}

.ai-code-note {
  margin-top: auto;
  padding-top: 22px;
  color: var(--color-accent-dark);
  font-size: 11px;
  overflow-wrap: anywhere;
}

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

.ai-diagnostic-list article {
  min-width: 0;
  padding: 30px;
  border-bottom: 1px solid var(--color-line);
}

.ai-diagnostic-list article:nth-child(odd) {
  padding-left: 0;
  border-right: 1px solid var(--color-line);
}

.ai-diagnostic-list h3 {
  font-size: 20px;
}

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

.ai-diagnostic-list strong {
  color: var(--color-ink);
}

.ai-selection-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.65fr);
  align-items: start;
  gap: 48px;
}

.ai-selection-copy h3 {
  font-size: 24px;
}

.ai-selection-copy p + p {
  margin-top: 20px;
}

.ai-selection-panel {
  padding: 30px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-medium);
  background: var(--color-panel);
  box-shadow: var(--shadow-soft);
}

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

@media (max-width: 1080px) {
  .ai-hero-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 48px;
  }

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

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

  .ai-principle:last-child,
  .ai-dev-card:last-child {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  .ai-hero-layout {
    min-height: auto;
    padding-top: 64px;
    padding-bottom: 68px;
  }

  .ai-hero-copy h1 {
    font-size: 38px;
  }

  .ai-hero-lead {
    font-size: 16px;
  }

  .ai-route-canvas {
    min-height: 250px;
  }

  .ai-node-label {
    display: none;
  }

  .ai-guide {
    padding-top: 54px;
  }

  .ai-section {
    padding-top: 68px;
    padding-bottom: 68px;
  }

  .ai-principle-grid,
  .ai-dev-grid,
  .ai-check-flow,
  .ai-compare,
  .ai-diagnostic-list,
  .ai-selection-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .ai-principle:last-child,
  .ai-dev-card:last-child {
    grid-column: auto;
  }

  .ai-check-flow article + article,
  .ai-compare-panel + .ai-compare-panel {
    border-top: 1px solid var(--color-line);
    border-left: 0;
  }

  .ai-tool-row {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 18px;
  }

  .ai-tool-row .badge {
    grid-column: 2;
    justify-self: start;
  }

  .ai-diagnostic-list article,
  .ai-diagnostic-list article:nth-child(odd) {
    padding-right: 0;
    padding-left: 0;
    border-right: 0;
  }
}

@media (max-width: 480px) {
  .ai-hero-copy h1 {
    font-size: 34px;
  }

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

  .ai-hero-trust {
    display: grid;
    gap: 9px;
  }

  .ai-principle,
  .ai-check-flow article,
  .ai-compare-panel,
  .ai-dev-card,
  .ai-selection-panel {
    padding: 22px;
  }

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

  .ai-tool-row .badge {
    grid-column: auto;
  }
}