/* Query Engine — rag-pipeline workzone diagrams.
   The search tool's body: embed → retrieve → rerank → augment → generate (the
   route the model runs when it calls search_knowledge). Reuses the stk-* kit for
   the route bands (presets below — the KS-owned embed/retrieve, the QE-owned
   tail), and adds the page-only primitives: the side owner tag inside a band bar
   (rp-side), the owner seam strip under the stack (rp-seam), the model map
   (rp-models), the rerank v1/v2 split (rp-rerank) and the agent boundary
   hand-off (rp-bound).
   Static — no hover affordance (README §Hover).
   Loaded by _workzone/rag-pipeline.html on top of ../../module.css
   + ../../layered-stack.css.
   Placement convention: docs/architecture/README.md §Styling. */

/* ════════════════ ROUTE BAND ACCENTS ════════════════ embed/retrieve
   (Knowledge Store green, the storage side) → rerank/augment/generate (Query
   Engine accent, the RAG side). */
.stk-layer--ks {
  --stk-lc: var(--s3);
  --stk-lc-pale: var(--s3-pale);
}
.stk-layer--qe {
  --stk-lc: var(--accent);
  --stk-lc-pale: var(--tint-8);
}

/* ── Owner tag in the band bar — names which module runs the step, sits
   before the italic role on the right. ── */
.rp-side {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 0.6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--s3);
}
.rp-side--qe {
  color: var(--accent);
}
/* When the role text follows, the tag keeps left of it (role takes the
   margin-auto instead). */
.stk-layer__bar .rp-side + .stk-layer__role {
  margin-left: 0.7rem;
}
.stk-layer__bar .rp-side {
  margin-left: auto;
}
.stk-layer__bar .rp-side ~ .stk-layer__role {
  margin-left: 0.7rem;
  max-width: 22ch;
}

/* ════════════════ OWNER SEAM ════════════════ summary strip under the stack —
   which side owns which steps: KS does embed+retrieve, QE the rest. */
.rp-seam {
  display: flex;
  align-items: stretch;
  gap: 0.7rem;
  margin: 1rem 0 0.3rem;
}
.rp-seam__col {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.7rem 0.9rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}
.rp-seam__col--ks {
  border-left: 4px solid var(--s3);
}
.rp-seam__col--qe {
  border-left: 4px solid var(--accent);
  background: var(--tint-6);
}
.rp-seam__who {
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--text);
}
.rp-seam__act {
  font-family: var(--mono);
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}
.rp-seam__col--ks .rp-seam__act {
  color: var(--s3);
}
.rp-seam__col--qe .rp-seam__act {
  color: var(--accent);
}
.rp-seam__arrow {
  align-self: center;
  font-size: 1rem;
  color: var(--accent);
}

/* ════════════════ MODEL MAP ════════════════ three cards — chat (leads the
   turn + generate) · embed (shared) · rerank (none in v1), each its accent. */
.rp-models {
  display: flex;
  gap: 0.6rem;
  margin: 1.1rem 0 0.4rem;
}
.rp-model {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 0.75rem 0.85rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: 3px solid var(--dot, var(--text-muted));
  border-radius: var(--radius-md);
}
.rp-model--chat {
  border-top-color: var(--accent);
}
.rp-model--embed {
  border-top-color: var(--s3);
}
.rp-model--rerank {
  border-top-color: var(--s2);
}
.rp-model:target {
  animation: target-highlight 2.6s ease-out;
}
@media (prefers-reduced-motion: reduce) {
  .rp-model:target {
    animation: none;
    box-shadow: 0 0 0 2px var(--accent-muted);
  }
}
.rp-model__h {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
}
.rp-model__step {
  font-family: var(--mono);
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}
.rp-model--chat .rp-model__step {
  color: var(--accent);
}
.rp-model--embed .rp-model__step {
  color: var(--s3);
}
.rp-model--rerank .rp-model__step {
  color: var(--s2);
}
.rp-model__name {
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--text);
}
.rp-model__d {
  font-size: 0.75rem;
  color: var(--text-dim);
  line-height: 1.5;
}

/* ════════════════ RERANK SPLIT ════════════════ v1 RRF-from-KS (no model) vs
   the v2 cross-encoder reranker (its own model). */
.rp-rerank {
  display: flex;
  gap: 0.75rem;
  margin: 1rem 0 0.3rem;
}
.rp-rerank__col {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--text-muted);
  border-radius: var(--radius-md);
  padding: 0.8rem 1rem;
}
.rp-rerank__col--v1 {
  border-left-color: var(--accent);
  background: var(--tint-6);
}
.rp-rerank__col--v2 {
  border-left-color: var(--s2);
}
.rp-rerank__h {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
}
.rp-rerank__t {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text);
}
.rp-rerank__d {
  font-size: 0.77rem;
  color: var(--text-dim);
  line-height: 1.55;
}

/* ════════════════ AGENT BOUNDARY ════════════════ QE one-pass RAG ▸ Agent
   Engine multi-step reasoning — where the RAG route ends. */
.rp-bound {
  display: flex;
  gap: 0.75rem;
  margin: 0.9rem 0 0.3rem;
}
.rp-bound__col {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
}
.rp-bound__col--here {
  border-left: 4px solid var(--accent);
  background: var(--tint-6);
}
.rp-bound__col--there {
  border-left: 4px solid var(--s2);
}
.rp-bound__head {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.45rem;
}
.rp-bound__who {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text);
}
.rp-bound__act {
  font-family: var(--mono);
  font-size: 0.6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}
.rp-bound__col--here .rp-bound__act {
  color: var(--accent);
}
.rp-bound__d {
  font-size: 0.78rem;
  color: var(--text-dim);
  line-height: 1.55;
}
.rp-bound__seam {
  align-self: center;
  font-size: 1rem;
  color: var(--accent);
}

/* ════════════════ CACHE GATE ════════════════ exact-retrieval cache
   short-circuit at the tool entry: a hit returns cached candidates, a miss falls
   through into the expensive embed→retrieve. Keyed on the standalone query +
   identity, so cached candidates never cross permissions. Dashed gate, not a
   route band — it interrupts the descent rather than being a step in it. */
.rp-cache {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 1rem;
  margin: 0.2rem 0;
  padding: 0.6rem 0.9rem;
  background: var(--surface);
  border: 1.5px dashed var(--border);
  border-radius: var(--radius-md);
}
.rp-cache:target {
  animation: target-highlight 2.6s ease-out;
}
@media (prefers-reduced-motion: reduce) {
  .rp-cache:target {
    animation: none;
    box-shadow: 0 0 0 2px var(--accent-muted);
  }
}
.rp-cache__gate {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}
.rp-cache__d {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--accent-muted);
}
.rp-cache__q {
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--text);
}
.rp-cache__key {
  font-family: var(--mono);
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-muted);
}
.rp-cache__branches {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.1rem;
  margin-left: auto;
}
.rp-cache__branch {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.rp-cache__cond {
  font-family: var(--mono);
  font-size: 0.6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.05rem 0.4rem;
  border-radius: var(--radius-md);
}
.rp-cache__branch--hit .rp-cache__cond {
  color: var(--s3);
  background: var(--s3-pale);
}
.rp-cache__branch--miss .rp-cache__cond {
  color: var(--text-muted);
  background: var(--tint-6);
}
.rp-cache__arr {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent);
}
.rp-cache__res {
  font-size: 0.74rem;
  color: var(--text-dim);
}

@media (max-width: 640px) {
  .rp-seam,
  .rp-models,
  .rp-rerank,
  .rp-bound {
    flex-direction: column;
  }
}