/* =========================================================================
   Datasets hero — "license-ready catalog" rail
   Self-contained, scoped under .catalog-rail (distinct from .lifecycle).
   Brand tokens only. Transforms/opacity. prefers-reduced-motion aware.
   ========================================================================= */
.catalog-rail {
  position: absolute; inset: 0; z-index: 1;
  background:
    radial-gradient(120% 95% at 50% 30%, #16191d 0%, #101316 48%, var(--bg,#0A0A0A) 100%);
  font-family: var(--font-mono);
  display: flex; flex-direction: column; overflow: hidden;
}

/* header strip */
.catalog-rail__head {
  position: relative; z-index: 3;
  display: flex; align-items: center; gap: 8px;
  padding: 14px 16px 12px;
  font-size: 10px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--fg-muted, rgba(255,255,255,0.6));
  border-bottom: 1px solid var(--border, #24282E);
}
.catalog-rail__head span:last-child { color: var(--accent, #FB9826); }
.catalog-rail__sep { color: var(--fg-dim, rgba(255,255,255,0.4)); }

/* scrolling viewport with top/bottom fade mask */
.catalog-rail__viewport {
  position: relative; flex: 1 1 auto; overflow: hidden;
  -webkit-mask-image: linear-gradient(to bottom, transparent 0, #000 14%, #000 86%, transparent 100%);
  mask-image: linear-gradient(to bottom, transparent 0, #000 14%, #000 86%, transparent 100%);
}
.catalog-rail__track {
  position: absolute; left: 0; right: 0; top: 0;
  display: flex; flex-direction: column; gap: 12px;
  padding: 12px 14px;
  will-change: transform;
}
.is-rolling .catalog-rail__track { animation: catalog-scroll var(--rail-dur, 30s) linear infinite; }
@keyframes catalog-scroll {
  from { transform: translateY(0); }
  to   { transform: translateY(var(--rail-shift, -50%)); }
}

/* ---- card ---- */
.catalog-rail .crd {
  display: grid; grid-template-columns: 72px 1fr; gap: 13px; align-items: center;
  padding: 13px; border-radius: var(--r-md, 12px);
  background: var(--surface, #15181b);
  border: 1px solid var(--border, #24282E);
  border-left: 2px solid var(--border, #24282E);
  opacity: 0.42; transform: scale(0.965);
  transition: opacity .45s var(--ease-out), transform .45s var(--ease-out), border-color .45s var(--ease-out);
}
.catalog-rail .crd.is-featured {
  opacity: 1; transform: scale(1);
  border-left-color: var(--accent, #FB9826);
  box-shadow: 0 10px 30px -16px rgba(0,0,0,0.7);
}

/* code-drawn preview tile */
.catalog-rail .crd__preview {
  width: 72px; height: 72px; border-radius: 8px; overflow: hidden;
  background: linear-gradient(150deg, #14171a, #0c0e10);
  border: 1px solid var(--border, #24282E);
}
.catalog-rail .crd__preview canvas { display: block; width: 100%; height: 100%; }

/* card text */
.catalog-rail .crd__body { min-width: 0; }
.catalog-rail .crd__title {
  font-size: 13px; font-weight: 500; letter-spacing: -0.005em;
  color: var(--fg, #fff); white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.catalog-rail .crd__chips { margin-top: 7px; display: flex; flex-wrap: wrap; gap: 6px; }
.catalog-rail .crd__chip {
  font-size: 9.5px; letter-spacing: .02em; color: var(--fg-muted, rgba(255,255,255,0.62));
  border: 1px solid var(--border, #24282E); border-radius: 999px; padding: 2px 8px;
  white-space: nowrap;
}
.catalog-rail .crd__trust {
  margin-top: 9px; font-size: 9.5px; letter-spacing: .03em;
  color: var(--fg-dim, rgba(255,255,255,0.5)); display: flex; align-items: center; gap: 6px;
}
.catalog-rail .crd__trust b { color: var(--fg-muted, rgba(255,255,255,0.7)); font-weight: 500; }
.catalog-rail .crd__check { color: var(--accent, #FB9826); display: inline-flex; align-items: center; gap: 3px; }
.catalog-rail .crd__check svg { width: 11px; height: 11px; }

/* reduced motion: freeze, show a static stack (first 3) */
@media (prefers-reduced-motion: reduce) {
  .is-rolling .catalog-rail__track { animation: none; }
  .catalog-rail__viewport {
    -webkit-mask-image: linear-gradient(to bottom, #000 0, #000 88%, transparent 100%);
    mask-image: linear-gradient(to bottom, #000 0, #000 88%, transparent 100%);
  }
}