:root {
  --ai-hero-min: 680px;
  --ai-route-height: 470px;
  --ai-card-gap: 20px;
  --ai-line-width: 3px;
  --ai-table-min: 900px;
  --ai-code-size: 48px;
  --ai-surface-lavender: var(--color-tint-lavender);
  --ai-surface-teal: var(--color-hill-mid);
  --ai-surface-orange: var(--color-tint-orange);
  --ai-surface-cream: var(--color-tint-cream);
}

.ai-hero {
  position: relative;
  min-height: var(--ai-hero-min);
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
  padding-top: clamp(64px, 8vw, 112px);
  padding-bottom: clamp(72px, 9vw, 128px);
}

.ai-hero::before,
.ai-hero::after {
  position: absolute;
  border-radius: var(--radius-pill);
  content: "";
  pointer-events: none;
}

.ai-hero::before {
  width: 42vw;
  height: 42vw;
  right: -18vw;
  top: -20vw;
  background: var(--color-hill-far);
}

.ai-hero::after {
  width: 30vw;
  height: 30vw;
  left: -19vw;
  bottom: -18vw;
  background: var(--color-tint-lavender);
  opacity: 0.45;
}

.ai-hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(420px, 1.08fr);
  align-items: center;
  gap: clamp(42px, 7vw, 92px);
}

.ai-hero-copy h1 {
  max-width: 720px;
  margin-top: 20px;
}

.ai-hero-copy .lead {
  margin-top: 24px;
}

.ai-hero-copy .btn-row {
  margin-top: 30px;
}

.ai-trust-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.ai-trust-list li {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  padding: 7px 13px;
  color: var(--color-muted);
  font-size: 13px;
  font-weight: 680;
  box-shadow: var(--shadow-soft);
}

.ai-route-card {
  position: relative;
  min-height: var(--ai-route-height);
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-panel);
  box-shadow: var(--shadow-device);
}

.ai-route-card::before {
  position: absolute;
  inset: 64px 0 48px;
  background-image:
    linear-gradient(var(--color-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
  background-size: 38px 38px;
  content: "";
  opacity: 0.36;
}

.ai-route-head {
  position: relative;
  z-index: 2;
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid var(--color-border);
  padding-inline: 22px;
}

.ai-route-title {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 760;
  letter-spacing: 0.08em;
}

.ai-route-card svg {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 356px;
  display: block;
}

.ai-route-line {
  fill: none;
  stroke-linecap: round;
  stroke-width: var(--ai-line-width);
}

.ai-route-line--main {
  stroke: var(--color-accent);
}

.ai-route-line--branch {
  stroke: var(--color-success);
}

.ai-route-orbit {
  fill: none;
  stroke: var(--color-tint-lavender);
  stroke-width: 2px;
  stroke-dasharray: 5 8;
}

.ai-route-node rect,
.ai-route-chip rect {
  fill: var(--color-panel);
  stroke: var(--color-border);
}

.ai-route-node--accent rect {
  fill: var(--color-tint-lavender);
  stroke: var(--color-accent);
}

.ai-route-node--warm rect {
  fill: var(--color-tint-orange);
  stroke: var(--color-warning);
}

.ai-route-chip rect {
  fill: var(--color-hill-mid);
  stroke: var(--color-success);
}

.ai-route-chip--cream rect {
  fill: var(--color-tint-cream);
  stroke: var(--color-warning);
}

.ai-route-node text,
.ai-route-chip text {
  fill: var(--color-text);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 780;
}

.ai-route-chip text {
  font-size: 9px;
}

.ai-tool-strip {
  position: absolute;
  inset: auto 0 0;
  z-index: 3;
  min-height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  border-top: 1px solid var(--color-border);
  background: var(--color-panel);
  padding: 10px 18px;
}

.ai-tool-strip span {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 680;
}

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

.ai-principle {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-panel);
  padding: 28px;
  box-shadow: var(--shadow-soft);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.ai-principle:hover {
  transform: translateY(-2px);
  border-color: var(--color-accent);
}

.ai-principle-mark {
  width: var(--ai-code-size);
  height: var(--ai-code-size);
  display: grid;
  place-items: center;
  border-radius: var(--radius-md);
  background: var(--color-panel-alt);
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 800;
}

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

.ai-principle p {
  margin-top: 12px;
  color: var(--color-muted);
}

.ai-compare-table {
  width: 100%;
  min-width: var(--ai-table-min);
}

.ai-compare-table th,
.ai-compare-table td {
  border-bottom: 1px solid var(--color-border);
  padding: 17px 19px;
  text-align: left;
  vertical-align: top;
}

.ai-compare-table th {
  background: var(--color-panel-alt);
  color: var(--color-text);
  font-size: 13px;
  font-weight: 780;
}

.ai-compare-table td {
  color: var(--color-muted);
}

.ai-compare-table td:first-child {
  color: var(--color-text);
  font-weight: 760;
}

.ai-compare-table tr:last-child td {
  border-bottom: 0;
}

.ai-table-note {
  margin-top: 24px;
}

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

.ai-tool-card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-panel);
  padding: 30px;
  box-shadow: var(--shadow-soft);
  transition: transform var(--transition-fast);
}

.ai-tool-card::before {
  position: absolute;
  inset: 0 0 auto;
  height: 8px;
  content: "";
}

.ai-tool-card--lavender::before {
  background: var(--ai-surface-lavender);
}

.ai-tool-card--teal::before {
  background: var(--ai-surface-teal);
}

.ai-tool-card--orange::before {
  background: var(--ai-surface-orange);
}

.ai-tool-card--cream::before {
  background: var(--ai-surface-cream);
}

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

.ai-tool-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.ai-tool-code {
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.ai-tool-card h3 {
  margin-top: 22px;
  font-size: 25px;
}

.ai-tool-card p {
  margin-top: 13px;
  color: var(--color-muted);
}

.ai-split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--ai-card-gap);
}

.ai-split-panel h3 {
  font-size: 24px;
}

.ai-split-panel p {
  margin-top: 15px;
  color: var(--color-muted);
}

.ai-workflow {
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-panel);
  box-shadow: var(--shadow-soft);
}

.ai-workflow-row {
  display: grid;
  grid-template-columns: minmax(180px, 0.32fr) minmax(0, 1fr);
  gap: 28px;
  border-bottom: 1px solid var(--color-border);
  padding: 30px;
}

.ai-workflow-row:last-child {
  border-bottom: 0;
}

.ai-workflow-label {
  display: flex;
  align-items: center;
  gap: 15px;
}

.ai-workflow-icon {
  width: var(--ai-code-size);
  height: var(--ai-code-size);
  display: grid;
  flex-shrink: 0;
  place-items: center;
  border-radius: var(--radius-md);
  background: var(--color-tint-lavender);
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
}

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

.ai-workflow-copy p {
  color: var(--color-muted);
}

.ai-workflow-note {
  margin-top: 24px;
}

.ai-account-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.42fr);
  align-items: start;
  gap: 28px;
}

.ai-account-copy p {
  color: var(--color-muted);
}

.ai-account-check {
  position: sticky;
  top: calc(var(--header-height) + 20px);
}

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

.ai-account-check ul {
  display: grid;
  gap: 13px;
  margin-top: 20px;
}

.ai-account-check li {
  position: relative;
  padding-left: 26px;
  color: var(--color-muted);
}

.ai-account-check li::before {
  position: absolute;
  left: 0;
  top: 0.3em;
  width: 17px;
  height: 17px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-pill);
  background: var(--color-hill-mid);
  color: var(--color-bush-dark);
  content: "✓";
  font-size: 11px;
  font-weight: 800;
}

.ai-choice-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--ai-card-gap);
}

.ai-choice-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-panel);
  padding: 27px;
  box-shadow: var(--shadow-soft);
  transition: transform var(--transition-fast);
}

.ai-choice-card:hover {
  transform: translateY(-2px);
}

.ai-choice-tag {
  display: inline-flex;
  border-radius: var(--radius-pill);
  background: var(--color-hill-far);
  padding: 6px 12px;
  color: var(--color-bush-dark);
  font-size: 12px;
  font-weight: 750;
}

.ai-choice-card h3 {
  margin-top: 20px;
  font-size: 22px;
}

.ai-choice-card p {
  margin-top: 12px;
  color: var(--color-muted);
}

.ai-final-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 32px;
  margin-top: 30px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-hill-far);
  padding: clamp(28px, 5vw, 48px);
  box-shadow: var(--shadow-soft);
}

.ai-final-panel h3 {
  margin-top: 15px;
}

.ai-final-panel p {
  max-width: 760px;
  margin-top: 10px;
  color: var(--color-muted);
}

.ai-final-panel .btn-row {
  justify-content: flex-end;
}

@media (max-width: 980px) {
  .ai-hero-grid {
    grid-template-columns: 1fr;
  }

  .ai-route-card {
    width: min(680px, 100%);
    margin-inline: auto;
  }

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

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

  .ai-final-panel .btn-row {
    justify-content: flex-start;
  }
}

@media (max-width: 768px) {
  :root {
    --ai-hero-min: 0px;
    --ai-route-height: 390px;
  }

  .ai-hero {
    padding-top: 56px;
    padding-bottom: 72px;
  }

  .ai-route-card svg {
    height: 290px;
  }

  .ai-principle-grid,
  .ai-tool-grid,
  .ai-split,
  .ai-choice-grid,
  .ai-account-layout {
    grid-template-columns: 1fr;
  }

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

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

@media (max-width: 640px) {
  .ai-route-card {
    min-height: 350px;
  }

  .ai-route-card svg {
    width: 520px;
    height: 265px;
    transform: translateX(-18%);
  }

  .ai-tool-strip {
    justify-content: flex-start;
    overflow-x: auto;
  }

  .ai-tool-strip span {
    flex-shrink: 0;
  }

  .ai-principle,
  .ai-tool-card,
  .ai-choice-card {
    padding: 23px;
  }

  .ai-workflow-row {
    padding: 23px;
  }

  .ai-final-panel .btn-row,
  .ai-final-panel .btn {
    width: 100%;
  }

  .ai-final-panel .btn {
    flex: 1 1 150px;
  }
}