:root {
  --ai-copy-width: 760px;
  --ai-board-width: 980px;
  --ai-tool-min: 280px;
  --ai-path-size: 150px;
}

.ai-hero {
  position: relative;
  max-width: 100%;
  padding-top: clamp(62px, 8vw, 108px);
  padding-bottom: clamp(72px, 9vw, 118px);
  overflow-x: clip;
  border-bottom: 1px solid var(--overlay-line);
  background:
    radial-gradient(circle at 12% 8%, var(--accent-08), var(--color-transparent) 42%),
    radial-gradient(circle at 88% 92%, var(--mist-05), var(--color-transparent) 38%),
    var(--color-bg);
}

.ai-hero-glow {
  position: absolute;
  top: -32%;
  left: -18%;
  width: min(72vw, 900px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-08), var(--color-transparent) 64%);
  pointer-events: none;
}

.ai-hero-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.ai-hero-copy {
  display: flex;
  width: 100%;
  max-width: 850px;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.ai-hero-copy > .badge {
  margin-bottom: 18px;
}

.ai-hero-copy h1 {
  max-width: 820px;
}

.ai-hero-lede {
  max-width: 720px;
  margin-bottom: 24px;
  color: var(--color-muted);
  font-size: clamp(16px, 1.8vw, 19px);
}

.ai-hero-copy .btn-row {
  justify-content: center;
}

.ai-fact-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 0;
  margin: 24px 0 0;
  padding: 0;
  color: var(--color-muted);
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
}

.ai-fact-row li {
  display: inline-flex;
  align-items: center;
}

.ai-fact-row li + li::before {
  margin-inline: 12px;
  color: var(--color-dim);
  content: "·";
}

.ai-path-board {
  width: min(var(--ai-board-width), 100%);
  margin-top: 54px;
  padding: 0 24px 24px;
  overflow: hidden;
}

.ai-board-head {
  display: flex;
  min-height: 44px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-bottom: 1px solid var(--overlay-line);
  color: var(--color-dim);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .05em;
}

.ai-board-state {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.ai-board-state::before {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-success);
  box-shadow: 0 0 16px var(--tint-mint);
  content: "";
}

.ai-path-flow {
  display: grid;
  grid-template-columns: var(--ai-path-size) minmax(48px, 1fr) var(--ai-path-size) minmax(48px, 1fr) var(--ai-path-size);
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 34px 18px 24px;
}

.ai-path-node {
  display: flex;
  min-width: 0;
  min-height: 132px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 16px;
  border: 1px solid var(--overlay-edge);
  border-radius: var(--radius-md);
  background: var(--color-panel-raised);
  box-shadow: inset 0 1px 0 var(--overlay-top);
  text-align: center;
}

.ai-path-node .icon-plate {
  margin-bottom: 12px;
}

.ai-path-node strong {
  font-size: 14px;
}

.ai-path-node small {
  margin-top: 3px;
  color: var(--color-muted);
  font-size: 11px;
}

.ai-path-arrow {
  width: 100%;
  color: var(--color-accent);
}

.ai-board-notes {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.ai-board-notes span {
  padding: 5px 9px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 11px;
}

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

.ai-reading-grid {
  display: grid;
  grid-template-columns: minmax(230px, .65fr) minmax(0, 1.35fr);
  gap: clamp(36px, 6vw, 88px);
  align-items: start;
}

.ai-section-heading {
  position: sticky;
  top: calc(var(--nav-height) + 28px);
  min-width: 0;
}

.ai-section-heading.compact {
  position: static;
  max-width: 760px;
  margin-bottom: 34px;
}

.ai-section-heading p {
  color: var(--color-muted);
}

.ai-copy {
  width: 100%;
  max-width: var(--ai-copy-width);
  min-width: 0;
}

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

.ai-copy > p {
  font-size: 17px;
}

.ai-tool-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(var(--ai-tool-min), 1fr));
  gap: 14px;
}

.ai-tool-card {
  min-width: 0;
  padding: 24px;
  border: 1px solid var(--overlay-edge);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: inset 0 1px 0 var(--overlay-top), var(--shadow-card);
  transition: transform .18s ease, border-color .18s ease;
}

.ai-tool-card:hover {
  border-color: var(--accent-35);
  transform: translateY(-2px);
}

.ai-tool-card .icon-plate {
  margin-bottom: 20px;
}

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

.ai-tool-card p {
  color: var(--color-muted);
  font-size: 14px;
}

.ai-tool-card p:last-child {
  margin-bottom: 0;
}

.ai-config-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 24px;
}

.ai-config-grid .card {
  display: flex;
  min-height: 280px;
  flex-direction: column;
}

.ai-config-grid .icon-plate {
  margin-bottom: 22px;
}

.ai-config-grid p {
  color: var(--color-muted);
}

.ai-symptom-list {
  display: grid;
  gap: 12px;
}

.ai-symptom-list article {
  padding: 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel-raised);
}

.ai-symptom-list h3 {
  margin-bottom: 8px;
  font-size: 18px;
}

.ai-symptom-list p {
  margin-bottom: 0;
  font-size: 15px;
}

.ai-end-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

@media (max-width: 1120px) {
  .ai-tool-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .ai-reading-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .ai-section-heading {
    position: static;
    max-width: 760px;
  }

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

  .ai-config-grid .card {
    min-height: 0;
  }
}

@media (max-width: 768px) {
  .ai-path-board {
    padding-inline: 16px;
  }

  .ai-path-flow {
    grid-template-columns: 1fr;
    padding-inline: 0;
  }

  .ai-path-node {
    min-height: 116px;
  }

  .ai-path-arrow {
    width: 58px;
    margin-inline: auto;
    transform: rotate(90deg);
  }

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

@media (max-width: 640px) {
  .ai-hero {
    padding-top: 48px;
    padding-bottom: 68px;
  }

  .ai-fact-row {
    flex-direction: column;
    align-items: center;
    gap: 5px;
  }

  .ai-fact-row li + li::before {
    display: none;
  }

  .ai-path-board {
    margin-top: 38px;
  }

  .ai-board-head {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    gap: 2px;
    padding-block: 10px;
  }

  .ai-copy > p {
    font-size: 16px;
  }

  .ai-end-links {
    flex-direction: column;
  }

  .ai-end-links .btn {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ai-tool-card {
    transition: none;
  }

  .ai-tool-card:hover {
    transform: none;
  }
}