.ai-hero {
  position: relative;
  min-height: calc(48rem - var(--header-height));
  overflow-x: clip;
  border-bottom: var(--border-thin) solid var(--color-soft-line);
}

.ai-hero::before {
  position: absolute;
  top: 8%;
  right: -8%;
  width: 58%;
  height: 84%;
  content: "";
  border-radius: var(--radius-xlarge);
  background: radial-gradient(circle at center, var(--color-forest-light), var(--color-transparent) 68%);
  filter: blur(22px);
  pointer-events: none;
}

.ai-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(28rem, 1.08fr);
  min-height: calc(48rem - var(--header-height));
  align-items: center;
  gap: var(--space-8);
}

.ai-hero-copy {
  position: relative;
  z-index: 3;
  min-width: 0;
  max-width: 39rem;
}

.ai-route-map {
  position: relative;
  min-width: 0;
  min-height: 36rem;
  overflow: hidden;
  border: var(--border-thin) solid var(--color-border);
  border-radius: var(--radius-xlarge);
  background:
    radial-gradient(circle at center, var(--color-soft-accent-strong), var(--color-transparent) 30%),
    linear-gradient(145deg, var(--color-panel-strong), var(--color-panel));
  box-shadow: var(--shadow-leaf);
}

.ai-route-map::before,
.ai-route-map::after {
  position: absolute;
  inset: 8%;
  content: "";
  border: var(--border-thin) dashed var(--color-border);
  border-radius: 50%;
}

.ai-route-map::after {
  inset: 20%;
  border-color: var(--color-accent-dark);
  opacity: 0.68;
}

.ai-route-trunk {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 72%;
  height: var(--border-strong);
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--color-transparent), var(--color-accent), var(--color-transparent));
  box-shadow: 0 0 1.4rem var(--color-glow);
  transform: translate(-50%, -50%) rotate(-38deg);
}

.ai-route-trunk::before,
.ai-route-trunk::after {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 84%;
  height: var(--border-thin);
  content: "";
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--color-transparent), var(--color-success), var(--color-transparent));
  transform-origin: center;
}

.ai-route-trunk::before {
  transform: translate(-50%, -50%) rotate(76deg);
}

.ai-route-trunk::after {
  transform: translate(-50%, -50%) rotate(118deg);
}

.ai-route-core {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 2;
  display: grid;
  width: 6rem;
  height: 6rem;
  place-items: center;
  border: var(--border-strong) solid var(--color-accent);
  border-radius: 50%;
  color: var(--color-bg);
  background: var(--color-accent);
  box-shadow: 0 0 2.5rem var(--color-glow);
  font-family: var(--font-mono);
  font-size: var(--font-size-h3);
  font-weight: var(--weight-bold);
  transform: translate(-50%, -50%);
}

.ai-tool,
.ai-route-note {
  position: absolute;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  min-height: 2.5rem;
  padding-inline: var(--space-4);
  border: var(--border-thin) solid var(--color-border);
  border-radius: var(--radius-pill);
  color: var(--color-text);
  background: var(--color-surface-glass-strong);
  box-shadow: var(--shadow-panel);
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  white-space: nowrap;
  backdrop-filter: blur(12px);
}

.ai-tool::before {
  width: 0.48rem;
  height: 0.48rem;
  margin-right: var(--space-2);
  content: "";
  flex-shrink: 0;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  box-shadow: 0 0 0.8rem var(--color-glow);
}

.ai-tool-chatgpt {
  top: 12%;
  left: 12%;
}

.ai-tool-claude {
  top: 20%;
  right: 10%;
}

.ai-tool-gemini {
  top: 44%;
  left: 7%;
}

.ai-tool-copilot {
  top: 55%;
  right: 7%;
}

.ai-tool-midjourney {
  bottom: 14%;
  left: 12%;
}

.ai-tool-cursor {
  right: 14%;
  bottom: 8%;
}

.ai-route-note {
  min-height: 1.75rem;
  padding-inline: var(--space-3);
  color: var(--color-text-muted);
  background: var(--color-panel);
  font-size: var(--font-size-xs);
  letter-spacing: 0.08em;
  box-shadow: none;
}

.ai-route-note {
  top: 8%;
  left: 47%;
}

.ai-route-note-session {
  top: auto;
  right: 4%;
  bottom: 37%;
  left: auto;
}

.ai-route-note-api {
  top: auto;
  right: auto;
  bottom: 5%;
  left: 42%;
}

.ai-reading-layout {
  display: grid;
  grid-template-columns: minmax(15rem, 0.58fr) minmax(0, 1.42fr);
  align-items: start;
  gap: var(--space-9);
}

.ai-section-index {
  position: sticky;
  top: var(--space-8);
  display: grid;
  gap: var(--space-4);
  min-width: 0;
  padding-top: var(--space-3);
}

.ai-section-index::after {
  width: 72%;
  height: var(--border-thin);
  margin-top: var(--space-4);
  content: "";
  background: linear-gradient(90deg, var(--color-accent), var(--color-transparent));
}

.ai-prose {
  max-width: var(--content-width);
}

.ai-prose h3:first-child {
  margin-top: 0;
}

.ai-prose strong {
  color: var(--color-text);
}

.ai-table-shell {
  max-width: 100%;
  overflow-x: auto;
  border: var(--border-thin) solid var(--color-border);
  border-radius: var(--radius-large);
  background: var(--color-panel);
  box-shadow: var(--shadow-panel);
  overscroll-behavior-inline: contain;
  -webkit-overflow-scrolling: touch;
}

.ai-tool-table {
  width: 100%;
  min-width: 58rem;
  border-collapse: collapse;
}

.ai-tool-table th,
.ai-tool-table td {
  padding: var(--space-5);
  border-bottom: var(--border-thin) solid var(--color-soft-line);
  color: var(--color-text-muted);
  text-align: left;
  vertical-align: top;
}

.ai-tool-table th {
  color: var(--color-accent);
  background: var(--color-panel-strong);
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  letter-spacing: 0.05em;
}

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

.ai-tool-table tbody tr:hover {
  background: var(--color-soft-text);
}

.ai-tool-table td:first-child {
  color: var(--color-text);
  font-family: var(--font-mono);
}

.ai-table-footnote {
  margin: var(--space-4) 0 0;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.ai-split-notes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: start;
  gap: var(--space-5);
}

.ai-split-notes .panel:nth-child(2) {
  margin-top: var(--space-7);
}

.ai-split-notes h3 {
  margin-top: var(--space-5);
}

.ai-split-notes p {
  color: var(--color-text-muted);
}

.ai-split-notes p:last-child {
  margin-bottom: 0;
}

.ai-prose-follow {
  margin-top: var(--space-8);
}

.ai-failure-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: start;
  gap: var(--space-4);
}

.ai-choice-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(18rem, 0.65fr);
  align-items: center;
  gap: var(--space-8);
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
  border-top: var(--border-thin) solid var(--color-border);
  border-bottom: var(--border-thin) solid var(--color-border);
}

.ai-choice-copy {
  min-width: 0;
}

.ai-choice-copy h2 {
  max-width: 48rem;
  margin-top: var(--space-3);
}

.ai-choice-copy p {
  max-width: 50rem;
  color: var(--color-text-muted);
}

.ai-choice-copy p:first-of-type {
  margin-top: var(--space-5);
}

.ai-choice-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.ai-choice-vein {
  position: relative;
  min-width: 0;
  padding: var(--space-6);
  overflow: hidden;
  border: var(--border-thin) solid var(--color-accent-dark);
  border-radius: var(--radius-large);
  background:
    linear-gradient(145deg, var(--color-soft-accent), var(--color-transparent)),
    var(--color-panel);
  box-shadow: var(--shadow-panel);
}

.ai-choice-vein::after {
  position: absolute;
  top: var(--space-6);
  right: calc(var(--space-6) * -1);
  width: 7rem;
  height: 7rem;
  content: "";
  border: var(--border-thin) dashed var(--color-accent-dark);
  border-radius: 50%;
  opacity: 0.58;
}

.ai-choice-vein ul {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--space-3);
  margin: var(--space-5) 0 0;
  padding: 0;
  list-style: none;
}

.ai-choice-vein li {
  position: relative;
  margin: 0;
  padding-left: var(--space-5);
  color: var(--color-text-muted);
}

.ai-choice-vein li::before {
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 0.48rem;
  height: 0.48rem;
  content: "";
  border-radius: var(--radius-pill);
  background: var(--color-success);
  box-shadow: 0 0 0.75rem var(--color-soft-success);
}

@media (max-width: 64rem) {
  .ai-hero-grid {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: var(--space-9);
    padding-bottom: var(--space-9);
  }

  .ai-hero-copy {
    max-width: 45rem;
  }

  .ai-route-map {
    min-height: 31rem;
  }

  .ai-reading-layout {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .ai-section-index {
    position: static;
    max-width: 42rem;
  }

  .ai-prose {
    max-width: var(--content-width);
  }

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

@media (max-width: 40rem) {
  .ai-hero::before {
    width: 100%;
    right: -32%;
  }

  .ai-hero-grid {
    gap: var(--space-7);
    padding-top: var(--space-8);
    padding-bottom: var(--space-8);
  }

  .ai-route-map {
    min-height: 25rem;
    border-radius: var(--radius-large);
  }

  .ai-route-core {
    width: 4.75rem;
    height: 4.75rem;
  }

  .ai-tool {
    min-height: 2.1rem;
    padding-inline: var(--space-3);
    font-size: var(--font-size-xs);
  }

  .ai-tool-chatgpt {
    top: 10%;
    left: 5%;
  }

  .ai-tool-claude {
    top: 19%;
    right: 4%;
  }

  .ai-tool-gemini {
    top: 43%;
    left: 2%;
  }

  .ai-tool-copilot {
    top: 57%;
    right: 2%;
  }

  .ai-tool-midjourney {
    bottom: 13%;
    left: 3%;
  }

  .ai-tool-cursor {
    right: 6%;
    bottom: 5%;
  }

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

  .ai-split-notes,
  .ai-failure-list {
    grid-template-columns: 1fr;
  }

  .ai-split-notes .panel:nth-child(2) {
    margin-top: 0;
  }

  .ai-tool-table th,
  .ai-tool-table td {
    padding: var(--space-4);
  }

  .ai-choice-layout {
    gap: var(--space-6);
  }

  .ai-choice-actions .button {
    flex: 1 1 8rem;
  }

  .ai-choice-vein {
    padding: var(--space-5);
    border-radius: var(--radius-medium);
  }
}

@media (prefers-reduced-motion: reduce) {
  .ai-route-map,
  .ai-route-core,
  .ai-tool {
    animation: none;
  }
}