/* Swimlane stack kit (swl-*) — the stack & structure workzone diagram.
   A module's _workzone/stack.html lays its libraries and file tree side by
   side inside horizontal lanes: each .swl-lane runs two columns (library
   stack | package tree), and .swl-grp clusters pills (.swl-pill) by role.
   Backend-only modules run one Backend lane; a module with a UI adds a
   Frontend lane (.swl-lane--fe). Shared side-notes (.swl-defer callout,
   .swl-fe-note thin-client note) are kit primitives; only truly bespoke
   callouts (a blacklist, a full-width routing lane) live as deltas in the
   page's own _workzone/stack.css on top of this kit.
   Reuses module.css .file-tree / .draft-notice / .xref / [data-tip] and
   shared .iter. Static blocks — only <summary> toggles, .xref links and
   [data-tip] hover are interactive (README §Hover).
   Loaded by _workzone/stack.html on top of ../../module.css.
   Placement convention: docs/architecture/README.md §Styling. */

/* ── Swimlane band ── */
.swl-lane {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  /* visible (not hidden): let data-tip bubbles escape the lane at the left/top
     edges. The rail has no background, so rounded corners need no clipping. */
  overflow: visible;
  margin-bottom: 1.1rem;
}

.swl-lane--be {
  border-left: var(--border-w) solid var(--s1);
}

.swl-lane--fe {
  border-left: var(--border-w) solid var(--s3);
}

.swl-lane__rail {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.7rem 1.1rem;
  border-bottom: 1px solid var(--border);
}

.swl-lane__tag {
  font-family: var(--mono);
  font-size: 0.66rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.25rem 0.55rem;
  border-radius: var(--pill-radius);
  color: #fff;
}

.swl-lane--be .swl-lane__tag {
  background: var(--s1);
}

.swl-lane--fe .swl-lane__tag {
  background: var(--s3);
}

/* ── Two columns inside a lane: stack | structure ── */
.swl-lane__body {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.swl-col {
  padding: 1rem 1.1rem 1.2rem;
}

.swl-col + .swl-col {
  border-left: 1px solid var(--border);
  background: var(--tint-4);
}

/* Column heads are .mod-label in HTML; local deltas only. */
.swl-col__head {
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

/* ── Library groups (stack column) ── */
.swl-grp {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.75rem;
  margin-bottom: 0.6rem;
}

.swl-grp:last-child {
  margin-bottom: 0;
}

.swl-grp--v2 {
  border-style: dashed;
}

.swl-grp__head {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 0.5rem;
}

.swl-grp__label {
  font-size: 0.82rem;
  font-weight: 700;
}

.swl-grp__pills {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
}

/* Stacked pill rows in one group — keep them off each other. */
.swl-grp__pills + .swl-grp__pills {
  margin-top: 0.4rem;
}

.swl-pill {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  background: var(--tint-8);
  color: var(--text);
  border: 1px solid var(--tint-15);
  border-radius: var(--tag-radius);
  padding: 0.22rem 0.5rem;
}

.swl-pill--std {
  background: var(--s2-pale);
  border-color: var(--tint-15);
  color: var(--s2);
}

/* ── Decision notes (collapsible, under the structure column) ── */
.swl-note {
  margin-top: 0.7rem;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 9px;
}

.swl-note > summary {
  padding: 0.5rem 0.7rem;
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.swl-note > summary::before {
  content: "▸";
  color: var(--accent);
  font-size: 0.7rem;
}

.swl-note[open] > summary::before {
  content: "▾";
}

.swl-note > summary:hover {
  color: var(--text);
}

.swl-note__body {
  padding: 0 0.7rem 0.65rem 1.7rem;
  font-size: 0.77rem;
  line-height: 1.5;
  color: var(--text-dim);
}

.swl-note__body code {
  font-size: 0.92em;
  color: var(--text);
}

/* ── Frontend thin-client note (module has no own UI — surfaces render it) ── */
/* Frontend lane carries a single note, not two columns. */
.swl-lane__body--note {
  grid-template-columns: 1fr;
}

.swl-fe-note {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--text-dim);
}

.swl-fe-note__ico {
  font-size: 1rem;
  flex-shrink: 0;
}

.swl-fe-note b {
  color: var(--text);
  font-weight: 700;
}

/* ── Callout (.swl-defer) — a neutral side-note below the lanes ──
   one block carrying a cross-cutting decision a page wants stated next to its
   stack: a deferred engine ("not in v1"), or a shared layer that isn't this
   module's to own (the tool-calling harness). Neutral tint, never a blacklist.
   Each page fills it with its own copy; .pkg highlights an inline keyword. */
.swl-defer {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  background: var(--tint-4);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.8rem 1.1rem;
  margin-bottom: 1rem;
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--text-dim);
}

.swl-defer__ico {
  font-size: 1rem;
  flex-shrink: 0;
}

.swl-defer b {
  color: var(--text);
  font-weight: 700;
}

.swl-defer .pkg {
  font-family: var(--mono);
  font-weight: 700;
  color: var(--text);
}

@media (max-width: 880px) {
  .swl-lane__body {
    grid-template-columns: 1fr;
  }
  .swl-col + .swl-col {
    border-left: none;
    border-top: 1px solid var(--border);
  }
}