/* Agent Engine — runtime page diagrams: prompt composition · agent loop · tools triad.
   Loaded by _workzone/runtime.html on top of module.css.
   Placement convention: docs/architecture/README.md §Styling. */

/* ═══════════════════════════════════════════
   Prompt composition — stacked layers
   ═══════════════════════════════════════════ */
.rt-compose {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin: 0.2rem 0 0.3rem;
}

.rt-layer {
  display: grid;
  grid-template-columns: 1.6rem 1fr auto;
  align-items: center;
  gap: 0.7rem;
  padding: 0.6rem 0.85rem;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--border);
  background: var(--surface);
}

.rt-layer--platform {
  border-color: var(--s1);
  background: var(--tint-6);
}
.rt-layer--agent {
  border-color: var(--s3);
  border-style: dashed;
}

.rt-layer__n {
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
  text-align: center;
}

.rt-layer__name {
  font-weight: 700;
  font-size: 0.86rem;
}
.rt-layer__name small {
  display: block;
  font-weight: 400;
  font-size: 0.74rem;
  color: var(--text-dim);
}

.rt-layer__who {
  font-family: var(--mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  white-space: nowrap;
}

.rt-compose__seam {
  text-align: center;
  font-size: 0.74rem;
  color: var(--text-dim);
  margin-top: 0.2rem;
}
.rt-compose__seam b {
  color: var(--text);
}

/* ═══════════════════════════════════════════
   Agent loop — cycle
   ═══════════════════════════════════════════ */
.rt-loop {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: stretch;
  gap: 0.7rem;
  margin: 0.3rem 0;
}

.rt-end {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.25rem;
  min-width: 7rem;
  padding: 0.7rem 0.8rem;
  border-radius: var(--radius-md);
  background: var(--surface);
  border: 1.5px solid var(--border);
  text-align: center;
}
.rt-end--in {
  border-color: var(--s2);
}
.rt-end--out {
  border-color: var(--s3);
  background: var(--s3-pale);
}
.rt-end__g {
  font-size: 1.1rem;
}
.rt-end__t {
  font-weight: 700;
  font-size: 0.8rem;
}
.rt-end__s {
  font-size: 0.72rem;
  color: var(--text-dim);
}

.rt-cycle {
  position: relative;
  border: 2px dashed var(--accent-muted);
  border-radius: var(--radius);
  padding: 0.9rem 0.9rem 0.7rem;
  background: var(--paper);
}
.rt-cycle__cap {
  position: absolute;
  top: -0.62rem;
  left: 0.9rem;
  background: var(--paper);
  padding: 0 0.45rem;
  font-family: var(--mono);
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
}
.rt-steps {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.4rem;
  flex-wrap: wrap;
}
.rt-step {
  flex: 1 1 0;
  min-width: 5.5rem;
  text-align: center;
  padding: 0.5rem 0.4rem;
  border-radius: var(--radius-md);
  background: var(--surface);
  border: 1.5px solid var(--border);
}
.rt-step__g {
  font-size: 1rem;
}
.rt-step__t {
  font-weight: 700;
  font-size: 0.8rem;
  margin-top: 0.1rem;
}
.rt-step__s {
  font-size: 0.7rem;
  color: var(--text-dim);
}
.rt-step--ai {
  border-color: var(--accent);
}
.rt-arr {
  color: var(--text-muted);
  font-weight: 700;
  flex: 0 0 auto;
}
.rt-cycle__back {
  margin-top: 0.55rem;
  text-align: center;
  font-size: 0.74rem;
  color: var(--text-dim);
}
.rt-cycle__back b {
  color: var(--accent);
}

/* ═══════════════════════════════════════════
   Tools triad
   ═══════════════════════════════════════════ */
.rt-tools {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.6rem;
  margin: 0.3rem 0;
}
.rt-tool {
  padding: 0.75rem 0.85rem;
  border-radius: var(--radius-md);
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-top: 3px solid var(--s2);
}
.rt-tool__name {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--accent);
}
.rt-tool__intent {
  font-size: 0.73rem;
  color: var(--text-muted);
  margin: 0.1rem 0 0.35rem;
}
.rt-tool__desc {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* ── shared: footnote rail of secondary facts ── */
.rt-foot {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.3rem;
  margin-top: 0.4rem;
  padding-top: 0.55rem;
  border-top: 1px solid var(--border);
  font-size: 0.76rem;
  color: var(--text-dim);
}
.rt-foot b {
  color: var(--text);
}

@media (max-width: 680px) {
  .rt-loop {
    grid-template-columns: 1fr;
  }
  .rt-tools {
    grid-template-columns: 1fr;
  }
}