/* /widgets/junior-pipeline — two parallel ladders, old + new.
   Bottom three rungs of the new ladder are visibly "eaten". The whole
   widget reveals on scroll so the gap registers physically as you read.
   ------------------------------------------------------------------ */

.pipeline-hero {
  padding-block: var(--space-7) var(--space-5);
  border-bottom: 3px solid var(--accent);
  position: relative;
}

.pipeline-hero__eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--accent);
  margin-bottom: var(--space-3);
}

.pipeline-hero h1 {
  font-size: var(--fs-2xl);
  margin-bottom: var(--space-3);
  max-width: 32ch;
}

.pipeline-hero__sub {
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  line-height: 1.3;
  max-width: 56ch;
  color: var(--fg-soft);
  margin-bottom: var(--space-3);
}

.pipeline-hero__warning {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--accent);
  border-top: 1px dashed var(--accent);
  border-bottom: 1px dashed var(--accent);
  padding-block: var(--space-2);
  margin-block: var(--space-4);
  max-width: 56ch;
}

.pipeline-hero__hint {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--muted);
  margin: 0;
}

/* ------------------------------------------------------------------
   LADDERS — two columns side by side. Same trajectory, same number of
   rungs. The new ladder gets the cracked-rung treatment at the bottom.
   ------------------------------------------------------------------ */

.pipeline-ladders {
  padding-block: var(--space-6);
}

.pipeline-ladders > .wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(1rem, 4vw, var(--space-5));
  align-items: start;
}

.ladder {
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  padding: var(--space-4);
  position: relative;
}

.ladder--new {
  border-color: var(--accent);
}

.ladder__head {
  border-bottom: 1px dashed var(--border-strong);
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-3);
}

.ladder__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--muted);
  border: 1px solid var(--border-strong);
  padding: 0.15rem 0.55rem;
  margin-bottom: var(--space-2);
}

.ladder__tag--alarm {
  color: var(--accent);
  border-color: var(--accent);
}

.ladder__head h3 {
  font-size: var(--fs-xl);
  margin: 0 0 var(--space-2);
}

.ladder__lede {
  font-family: var(--font-display);
  font-size: var(--fs-md);
  color: var(--fg-soft);
  margin: 0;
  max-width: 36ch;
}

/* ------------------------------------------------------------------
   RUNGS — list. Top of list = master. Bottom = shoot-for-free.
   Each rung is a button that toggles a detail panel.
   ------------------------------------------------------------------ */

.rungs {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.rung {
  opacity: 0;
  transform: translateY(0.75rem);
  transition: opacity 600ms var(--ease-snap), transform 600ms var(--ease-snap);
}

.rung[data-on="true"] {
  opacity: 1;
  transform: none;
}

.rung__btn {
  width: 100%;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background: #0d0d0d;
  border: 1px solid var(--border-strong);
  color: var(--fg);
  font: inherit;
  font-family: var(--font-mono);
  text-align: left;
  cursor: pointer;
  position: relative;
  transition: border-color 160ms var(--ease-snap),
    background 160ms var(--ease-snap),
    transform 160ms var(--ease-snap);
}

.rung__btn:hover,
.rung__btn:focus-visible,
.rung__btn[aria-expanded="true"] {
  outline: none;
  border-color: var(--accent);
  background: #131313;
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0 var(--accent);
}

.rung__order {
  font-size: var(--fs-xs);
  letter-spacing: 0.18em;
  color: var(--accent);
}

.rung__label {
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  letter-spacing: -0.01em;
  color: var(--fg);
}

.rung__mark {
  font-size: var(--fs-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.rung__mark--ok {
  color: var(--fg-soft);
}

.rung__bar {
  grid-column: 1 / -1;
  height: 3px;
  margin-top: var(--space-2);
  background: var(--accent);
  width: 100%;
}

.rung--old .rung__bar {
  background: var(--accent);
}

.rung--new .rung__bar {
  background: var(--accent);
}

/* ------------------------------------------------------------------
   EATEN — bottom three rungs of the new ladder. Slashed, faded,
   marked. The rung is still visible (so the gap is legible) but
   visibly chewed.
   ------------------------------------------------------------------ */

.rung--eaten .rung__btn {
  background: transparent;
  border-style: dashed;
  border-color: var(--rule);
  color: var(--muted);
}

.rung--eaten .rung__label {
  color: var(--muted);
  text-decoration: line-through;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
}

.rung--eaten .rung__mark {
  color: var(--accent);
  font-weight: 700;
}

.rung--eaten .rung__bar {
  background: repeating-linear-gradient(
    90deg,
    var(--accent) 0 0.6rem,
    transparent 0.6rem 1.1rem
  );
  opacity: 0.85;
}

.rung--eaten .rung__btn::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    -22deg,
    transparent 0 0.6rem,
    rgba(225, 29, 46, 0.18) 0.6rem 0.7rem
  );
  mix-blend-mode: screen;
}

/* ------------------------------------------------------------------
   DETAIL — the example pulled from source-material/. Toggled via the
   button's aria-expanded; we set [hidden] in JS so it stays
   accessible to AT.
   ------------------------------------------------------------------ */

.rung__detail {
  margin-top: var(--space-2);
  padding: var(--space-3);
  border-left: 3px solid var(--accent);
  background: #0d0d0d;
}

.rung__detail[hidden] {
  display: none;
}

.rung__summary {
  font-family: var(--font-display);
  font-size: var(--fs-md);
  line-height: 1.4;
  color: var(--fg);
  margin: 0 0 var(--space-2);
  max-width: none;
}

.rung__example {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  line-height: 1.55;
  color: var(--fg-soft);
  border: 0;
  padding: var(--space-2) 0 0;
  margin: 0 0 var(--space-2);
  border-top: 1px dashed var(--border-strong);
}

.rung__source {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--muted);
  margin: 0;
  word-break: break-all;
}

.rung__source code {
  font-family: inherit;
  color: var(--accent);
  background: transparent;
  padding: 0;
}

/* ------------------------------------------------------------------
   FINAL — the punchline that turns the diagram into a problem
   ------------------------------------------------------------------ */

.pipeline-final {
  padding-block: var(--space-7);
  text-align: center;
  background: var(--accent);
  color: var(--accent-ink);
}

.pipeline-final h2 {
  font-size: var(--fs-2xl);
  margin: 0 auto var(--space-3);
  max-width: 24ch;
  color: var(--accent-ink);
}

.pipeline-final p {
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  line-height: 1.3;
  max-width: 50ch;
  margin: 0 auto var(--space-4);
}

.pipeline-final .btn {
  background: var(--accent-ink);
  color: var(--accent);
  border-color: var(--accent-ink);
  margin: 0 var(--space-1) var(--space-2);
}

.pipeline-final .btn:hover,
.pipeline-final .btn:focus-visible {
  background: var(--bg);
  color: var(--accent);
  border-color: var(--bg);
  box-shadow: 3px 3px 0 var(--accent-ink);
}

/* ------------------------------------------------------------------
   RESPONSIVE — stack ladders on narrow viewports. The "new" ladder
   ends up below the "old" one which preserves the bottom-of-the-page
   = bottom-of-the-ladder visual logic.
   ------------------------------------------------------------------ */

@media (max-width: 860px) {
  .pipeline-ladders > .wrap {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
  .ladder {
    padding: var(--space-3);
  }
  .rung__btn {
    grid-template-columns: auto 1fr;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
  }
  .rung__mark {
    grid-column: 1 / -1;
    font-size: 0.7rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .rung {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .rung__btn:hover,
  .rung__btn:focus-visible,
  .rung__btn[aria-expanded="true"] {
    transform: none;
  }
}