/* Agent Engine — index.html diagram: vertical run timeline.
   Bespoke diagram: a single spine down the page, dot-nodes for each event of
   one run (trigger → prompt assembly → start gate → agentic loop → stop →
   log), the agentic loop drawn as a taller node with a brace to read "this
   repeats", and a side rail beside it for the weekly budget — a background
   constraint, not a point in time, so it never sits on the spine itself.
   Loaded by index.html on top of module.css.
   Placement convention: docs/architecture/README.md §Styling. */

/* ═══════════════════════════════════════════
   Timeline — sequence of one run
   ═══════════════════════════════════════════ */
.ae-tl {
  position: relative;
  display: flex;
  flex-direction: column;
  padding-left: 2.2rem;
  margin-top: 0.5rem;
}

/* ── Spine — a soft gradient down the run, so the dots read as points along
   one warm thread rather than beads on a flat grey line. ── */
.ae-tl::before {
  content: "";
  position: absolute;
  top: 0.6rem;
  bottom: 0.6rem;
  left: 0.6rem;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(
    to bottom,
    var(--s1) 0%,
    var(--s4) 34%,
    var(--s2) 66%,
    var(--s3) 100%
  );
  opacity: 0.5;
}

/* ── Event node ──
   Each event carries a phase colour (--ph) that threads through its dot,
   its timestamp badge and its card accent, so a row reads as one unit. ── */
.ae-tl__ev {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 1.1rem;
  --ph: var(--s1);
  --ph-bg: var(--tint-8);
}

.ae-tl__ev--gate {
  --ph: var(--s4);
  --ph-bg: var(--s4-pale);
}
.ae-tl__ev--loop {
  --ph: var(--s2);
  --ph-bg: var(--s2-pale);
}
.ae-tl__ev--stop {
  --ph: var(--s2);
  --ph-bg: var(--s2-pale);
}
.ae-tl__ev--end {
  --ph: var(--s3);
  --ph-bg: var(--s3-pale);
}

/* Dot — filled core, cream gap, a ring of the phase colour: a target that
   sits on the spine instead of a hollow bead floating beside it. */
.ae-tl__ev-dot {
  position: absolute;
  left: -2rem;
  top: 50%;
  transform: translateY(-50%);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ph);
  border: 3px solid var(--surface);
  box-shadow:
    0 0 0 2px var(--ph),
    0 1px 3px rgba(0, 0, 0, 0.15);
}

/* the loop node is taller — a slightly larger dot marks it */
.ae-tl__ev-dot--loop {
  width: 16px;
  height: 16px;
}

/* ── Segment connecting two nodes (plain spine filler, purely spacing) ── */
.ae-tl__seg {
  height: 1.4rem;
}

/* ── Card ── */
.ae-tl__ev-card {
  flex: 1;
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 2px solid var(--ph);
  border-radius: var(--radius);
  padding: 0.85rem 1.05rem;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  box-shadow: var(--card-shadow);
  transition:
    box-shadow 0.2s,
    transform 0.2s;
}

.ae-tl__ev-card:hover {
  box-shadow: var(--card-shadow-hover);
  transform: translateY(-1px);
}

/* short arm bridging the gap from the spine dot to its card */
.ae-tl__ev-card::before {
  content: "";
  position: absolute;
  left: -1.55rem;
  top: 50%;
  width: 1.55rem;
  height: 2px;
  background: var(--ph);
  opacity: 0.4;
  transform: translateY(-50%);
}

.ae-tl__ev-t {
  font-weight: 700;
  font-size: 0.92rem;
}

.ae-tl__ev-ts {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--ph);
  background: var(--ph-bg);
  border: 1px solid var(--ph);
  border-radius: var(--tag-radius);
  padding: 0.05rem 0.35rem;
  margin-right: 0.4rem;
}

.ae-tl__ev-d {
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--text-dim);
}

.ae-tl__ev-note {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.ae-tl__ev-link {
  align-self: flex-start;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--link-page-fg);
  text-decoration: underline;
}

/* ── Prompt layers (t0) — a numbered stack, priority read top-down.
   Layer ① (platform) dominates: filled medallion + lock; ②③ stay outlined. ── */
.ae-tl__layers {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.ae-tl__layer {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.8rem;
  padding: 0.5rem 0.7rem;
  border-radius: 9px;
  background: var(--paper);
  border: 1px solid var(--border);
  color: var(--text);
  text-decoration: none;
  transition:
    border-color 0.2s,
    transform 0.2s,
    box-shadow 0.2s;
}

.ae-tl__layer:hover {
  border-color: var(--accent-muted);
  transform: translateX(2px);
  box-shadow: var(--card-shadow);
}

/* numbered medallion */
.ae-tl__layer-n {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent);
  background: var(--tint-8);
  border: 1px solid var(--tint-15);
}

/* key + inline description */
.ae-tl__layer-b {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.3rem;
}

.ae-tl__layer-b b {
  font-weight: 700;
}

.ae-tl__layer-d {
  font-size: 0.76rem;
  color: var(--text-muted);
}

.ae-tl__layer-d::before {
  content: "— ";
}

/* platform layer — the locked base, visually heaviest */
.ae-tl__layer--lock {
  background: var(--tint-6);
  border-color: var(--tint-25);
}

.ae-tl__layer--lock .ae-tl__layer-n {
  color: var(--paper);
  background: var(--s1);
  border-color: var(--s1);
}

.ae-tl__layer-lk {
  flex: 0 0 auto;
  margin-left: auto;
  width: 13px;
  height: 13px;
  color: var(--s1);
  opacity: 0.85;
}

/* ── Gate (t1) ── stronger accent bar than the ordinary event card */
.ae-tl__ev-card--gate {
  border-left-width: var(--border-w);
}

.ae-tl__gate {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--text);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: background-color 0.2s;
}

.ae-tl__gate:hover {
  background: var(--tint-6);
}

.ae-tl__cond {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 0.78rem;
  background: var(--tint-8);
  border: 1px solid var(--tint-15);
  border-radius: var(--tag-radius);
  padding: 0.15rem 0.45rem;
}

.ae-tl__and {
  color: var(--text-muted);
  font-weight: 700;
}

.ae-tl__gate-arr {
  font-weight: 700;
  color: var(--s4);
  margin-left: 0.2rem;
}

.ae-tl__guards {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.ae-tl__guard {
  font-size: 0.76rem;
  color: var(--text-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.ae-tl__guard:hover {
  border-color: var(--text-dim);
}

/* ── Loop node (t2) — taller card, brace marks the repeating span ── */
.ae-tl__ev--loop {
  align-items: stretch;
}

.ae-tl__ev-card--loop {
  border-left-width: var(--border-w);
}

.ae-tl__brace {
  position: relative;
  padding-left: 0.9rem;
  border-left: 2px dashed var(--s2);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.ae-tl__brace-label {
  font-size: 0.72rem;
  font-style: italic;
  color: var(--s2);
}

.ae-tl__cyc {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.35rem;
  font-size: 0.8rem;
}

.ae-tl__cyc-step {
  font-weight: 600;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--tag-radius);
  padding: 0.15rem 0.55rem;
}

.ae-tl__cyc-step a {
  color: inherit;
  font: inherit;
  text-decoration: none;
}

.ae-tl__cyc-step:has(a) {
  transition: all 0.2s;
}

.ae-tl__cyc-step:has(a):hover {
  border-color: var(--accent-muted);
  transform: translateY(-1px);
}

.ae-tl__cyc-arr {
  color: var(--text-muted);
}

.ae-tl__cyc-back {
  margin-left: 0.3rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--s2);
}

.ae-tl__tools {
  font-size: 0.78rem;
  color: var(--text-dim);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.3rem;
}

.ae-tl__tool {
  font-family: var(--mono);
  font-size: 0.74rem;
  font-weight: 600;
  background: var(--tint-8);
  border: 1px solid var(--tint-15);
  border-radius: var(--tag-radius);
  padding: 0.1rem 0.42rem;
  color: var(--accent);
  text-decoration: none;
  transition: all 0.2s;
}

.ae-tl__tool:hover {
  border-color: var(--accent-muted);
  transform: translateY(-1px);
}

.ae-tl__ks {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding-top: 0.4rem;
  border-top: 1px dashed var(--border);
}

.ae-tl__ks-h {
  font-size: 0.78rem;
  font-weight: 700;
}

.ae-tl__ks-d {
  font-size: 0.76rem;
  color: var(--text-muted);
}

/* ── Side rail — the weekly budget, parallel to the loop node, never on
   the spine (it's an ongoing constraint, not a moment in time). ── */
.ae-tl__rail {
  flex: 0 0 12rem;
  display: flex;
  align-items: stretch;
}

.ae-tl__rail-bar {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  justify-content: center;
  background: var(--s4-pale);
  border: 1px dashed var(--s4);
  border-radius: var(--radius);
  padding: 0.7rem 0.8rem;
  color: var(--text);
  text-decoration: none;
  box-shadow: var(--card-shadow);
  transition: all 0.2s;
}

.ae-tl__rail-bar:hover {
  border-color: var(--s4);
  border-style: solid;
  transform: translateY(-1px);
}

.ae-tl__rail-t {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--s4);
}

.ae-tl__rail-d {
  font-size: 0.74rem;
  line-height: 1.4;
  color: var(--text-dim);
}

@media (max-width: 720px) {
  .ae-tl__ev--loop {
    flex-direction: column;
  }
  .ae-tl__rail {
    flex: 1;
  }
}

/* ── Footnotes ── */
.ae-tl__foot {
  margin-top: 1.4rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--text-dim);
}
/* ═══════════════════════════════════════════
   Presets
   ═══════════════════════════════════════════ */
.presets {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.6rem;
}

.preset {
  background: var(--surface);
  border: 1.5px dashed var(--s4);
  border-radius: var(--radius-md);
  padding: 0.7rem 0.9rem;
}

.preset__name {
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 0.2rem;
}

.preset__desc {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* ═══════════════════════════════════════════
   Horizon nav group — grey ground for the v2 teasers
   ═══════════════════════════════════════════
   A muted band in the workzone nav: neutral grey links (not the warm accent
   tint of v1 topics) carrying a v2 pill, so the "next iteration" reads at a
   glance against the live topics above. */
.wz-nav__group--horizon {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.wz-nav__group--horizon::before {
  content: "✦";
  color: var(--text-muted);
}
.wz-link--horizon {
  background: #f4f1ec;
  border-color: #d9d3ca;
  color: var(--text-dim);
}
.wz-link--horizon:hover {
  border-color: var(--accent-muted);
  background: #ece8e1;
}
.wz-link--horizon .iter {
  margin-left: auto;
}

/* ═══════════════════════════════════════════
   Responsive
   ═══════════════════════════════════════════ */
@media (max-width: 640px) {
  .presets {
    grid-template-columns: 1fr;
  }
}