.research-lineage-page {
  display: grid;
  gap: 1.25rem;
}

.research-lineage-hero {
  display: grid;
  gap: 0.85rem;
}

.research-lineage-hero h1 {
  max-width: 18ch;
}

.research-lineage-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
}

.research-lineage-meta > div {
  border: 1px solid var(--border);
  border-radius: 0.55rem;
  padding: 0.75rem;
  background: color-mix(in srgb, var(--surface) 92%, transparent);
}

.research-lineage-meta span,
.lineage-node-meta,
.lineage-path-rule,
.lineage-authors summary {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.76rem;
}

.research-lineage-meta strong {
  display: block;
  margin-top: 0.28rem;
  color: var(--text);
}

.research-lineage-disclosure {
  border-left: 3px solid var(--accent);
  padding: 0.9rem 1rem;
  background: color-mix(in srgb, var(--accent) 6%, var(--surface));
}

.research-lineage-disclosure p + p {
  margin-top: 0.65rem;
}

.lineage-paths {
  display: grid;
  gap: 1rem;
}

.lineage-path {
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1rem;
  background: color-mix(in srgb, var(--surface) 95%, transparent);
}

.lineage-path-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.lineage-path-head h2 {
  margin: 0.2rem 0 0;
}

.lineage-path-rule {
  max-width: 34rem;
  text-align: right;
}

.lineage-track {
  display: grid;
  grid-template-columns: repeat(var(--lineage-count), minmax(14rem, 1fr));
  gap: 1.3rem;
  overflow-x: auto;
  padding: 0.25rem 0.1rem 0.65rem;
  scroll-snap-type: x proximity;
}

.lineage-node {
  position: relative;
  min-width: 14rem;
  border: 1px solid var(--border);
  border-radius: 0.65rem;
  padding: 0.9rem;
  background: var(--surface);
  scroll-snap-align: start;
}

.lineage-node:not(:last-child)::after {
  content: "TIME ORDER ONLY →";
  position: absolute;
  top: 50%;
  left: calc(100% + 0.2rem);
  width: 1rem;
  transform: translateY(-50%);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.58rem;
  line-height: 1.25;
  writing-mode: vertical-rl;
}

.lineage-node time,
.lineage-node-id,
.lineage-node-type {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.72rem;
}

.lineage-node h3 {
  margin: 0.55rem 0;
  font-size: 1rem;
  line-height: 1.35;
}

.lineage-node-meta {
  display: grid;
  gap: 0.2rem;
}

.lineage-authors {
  margin-top: 0.75rem;
  border-top: 1px solid var(--border);
  padding-top: 0.65rem;
}

.lineage-authors summary {
  cursor: pointer;
}

.lineage-authors p {
  margin-top: 0.55rem;
  font-size: 0.86rem;
  line-height: 1.55;
}

.lineage-node-actions {
  margin-top: 0.8rem;
}

.lineage-node-actions a {
  display: inline-flex;
  border: 1px solid var(--accent);
  border-radius: 0.4rem;
  padding: 0.45rem 0.6rem;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.76rem;
  text-decoration: none;
}

.lineage-node-actions a:hover,
.lineage-node-actions a:focus-visible {
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}

.research-lineage-boundary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.research-lineage-boundary > div {
  border-left: 2px solid var(--accent);
  padding: 0.75rem;
  background: color-mix(in srgb, var(--surface) 92%, transparent);
}

.research-lineage-boundary h3 {
  margin-bottom: 0.45rem;
}

@media (max-width: 820px) {
  .research-lineage-meta,
  .research-lineage-boundary {
    grid-template-columns: 1fr;
  }

  .lineage-path-head {
    display: grid;
  }

  .lineage-path-rule {
    text-align: left;
  }

  .lineage-track {
    grid-template-columns: repeat(var(--lineage-count), minmax(16rem, 82vw));
  }
}

@media (prefers-reduced-motion: reduce) {
  .lineage-track {
    scroll-behavior: auto;
  }
}