/* ============================================================
   The animated labs: bag of words, HAL, COALS.

   These pages sit on the chapter shell (ch-bar, ch-body, ch-col) and add
   the pieces the animations need: a transport, a token strip, a window
   readout and a co-occurrence grid. Everything is driven by the theme
   tokens in site.css, so light mode needs nothing extra here.
   ============================================================ */

.lb-lede { color: var(--ink-2); font-size: .96rem; max-width: 66ch; }

/* ---------- transport ---------- */
.lb-bar {
  position: sticky; top: 0; z-index: 5;
  display: flex; flex-wrap: wrap; align-items: center; gap: .5rem .6rem;
  margin: 1.8rem 0 1.4rem; padding: .75rem .8rem;
  border: 1px solid var(--line); border-radius: var(--r);
  background: color-mix(in oklab, var(--bg-2) 92%, transparent);
  backdrop-filter: blur(8px);
}
.lb-bar button {
  font: 600 .82rem/1 var(--sans);
  padding: .55rem .9rem; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--line-2); background: var(--card); color: var(--ink-2);
  transition: background .18s, color .18s, border-color .18s;
}
.lb-bar button:hover:not(:disabled) { background: var(--card-2); color: var(--ink); }
.lb-bar button:disabled { opacity: .4; cursor: not-allowed; }
.lb-bar button.go { background: var(--acid); color: var(--on-accent); border-color: transparent; }
.lb-bar button.go:hover:not(:disabled) { filter: brightness(1.08); }
.lb-bar .sp { flex: 1 1 auto; }
.lb-speed { display: inline-flex; align-items: center; gap: .5rem; font-size: .74rem;
  font-family: var(--mono); color: var(--mut); text-transform: uppercase; letter-spacing: .1em; }
.lb-speed input { width: 7.5rem; accent-color: var(--acid); }
.lb-step {
  font-family: var(--mono); font-size: .74rem; color: var(--mut);
  letter-spacing: .08em; text-transform: uppercase; white-space: nowrap;
}
.lb-step b { color: var(--acid); font-size: .95rem; }

/* ---------- the corpus, tokenised ---------- */
.lb-corpus {
  padding: .9rem 1rem; border-radius: var(--r); border: 1px solid var(--line);
  background: var(--card); font-size: .9rem; line-height: 2.4; color: var(--ink-2);
  overflow-x: auto;
}
.tok {
  display: inline-block; padding: .18rem .42rem; margin: 0 .1rem; border-radius: var(--r-sm);
  transition: background-color .25s, color .25s, transform .25s;
  font-family: var(--mono); font-size: .8rem; white-space: nowrap;
}
.tok.centre { background: var(--amber); color: var(--on-accent); font-weight: 700; transform: translateY(-2px); }
.tok.left   { background: color-mix(in oklab, var(--cyan) 34%, transparent); color: var(--ink); }
.tok.right  { background: color-mix(in oklab, var(--acid) 30%, transparent); color: var(--ink); }
.tok.done   { color: var(--mut); }

/* ---------- the window readout ---------- */
.lb-window { display: flex; flex-wrap: wrap; align-items: center; gap: .35rem; margin: 1.2rem 0; min-height: 2.6rem; }
.lb-window .w {
  font-family: var(--mono); font-size: .76rem; padding: .3rem .55rem; border-radius: var(--r-sm);
  border: 1px solid var(--line); color: var(--ink-2);
}
.lb-window .w b { color: var(--acid); font-style: normal; }
.lb-window .w.centre { background: var(--amber); color: var(--on-accent); border-color: transparent; font-weight: 700; }
.lb-window .w.left   { background: color-mix(in oklab, var(--cyan) 22%, transparent); }
.lb-window .w.right  { background: color-mix(in oklab, var(--acid) 20%, transparent); }
.lb-window .empty { font-size: .82rem; color: var(--mut); }

/* ---------- matrices ---------- */
.lb-grids { display: grid; gap: 1.2rem; grid-template-columns: 1fr; }
@media (min-width: 1000px) { .lb-grids.two { grid-template-columns: 1fr 1fr; } }
.lb-grid { border: 1px solid var(--line); border-radius: var(--r); background: var(--card); overflow: hidden; }
.lb-grid > h3 { margin: 0; padding: .8rem 1rem; font-size: .92rem; border-bottom: 1px solid var(--line); }
.lb-grid > h3 span { display: block; font: 400 .74rem/1.5 var(--mono); color: var(--mut); margin-top: .25rem; text-transform: none; letter-spacing: 0; }
.lb-scroll { overflow: auto; max-height: 32rem; }
.lb-grid table { border-collapse: collapse; font-family: var(--mono); font-size: .68rem; width: 100%; }
.lb-grid th, .lb-grid td { border: 1px solid var(--line); padding: .3rem .35rem; text-align: center; white-space: nowrap; }
.lb-grid th { background: var(--bg-2); color: var(--ink-2); font-weight: 600; position: sticky; top: 0; z-index: 1; }
.lb-grid tbody th { left: 0; z-index: 2; text-align: right; }
.lb-grid td { color: var(--mut); transition: background-color .5s, color .5s; }
.lb-grid td.hot { background: var(--acid); color: var(--on-accent); font-weight: 700; }
.lb-grid td.warm { color: var(--ink); }

/* ---------- bag of words ---------- */
.bow { display: grid; gap: 1.2rem; grid-template-columns: 1fr; margin-top: 1.6rem; }
@media (min-width: 860px) { .bow { grid-template-columns: 1fr 1fr; } }
.bow-side { border: 1px solid var(--line); border-radius: var(--r); background: var(--card); padding: 1.1rem 1.2rem; }
.bow-side h3 { font-size: .95rem; margin: 0 0 .2rem; }
.bow-side .sent { font-family: var(--mono); font-size: .8rem; color: var(--acid); margin-bottom: 1rem; }
.bow-chute { position: relative; height: 5.5rem; border-bottom: 1px dashed var(--line-2); overflow: hidden; }
.bow-fall {
  position: absolute; left: 50%; translate: -50% 0;
  font-family: var(--mono); font-size: .8rem; font-weight: 700;
  padding: .3rem .6rem; border-radius: 999px;
  background: var(--violet); color: var(--on-accent);
}
.bow-bag { display: flex; flex-wrap: wrap; gap: .45rem; align-content: flex-start; min-height: 7rem; padding-top: 1rem; }
.bow-bag .item {
  display: inline-flex; align-items: center; gap: .4rem;
  font-family: var(--mono); font-size: .78rem;
  padding: .32rem .5rem .32rem .62rem; border-radius: 999px;
  border: 1px solid var(--line-2); background: var(--card-2); color: var(--ink);
}
.bow-bag .item b { background: var(--acid); color: var(--on-accent); border-radius: 999px; padding: 0 .38rem; font-size: .7rem; }
.bow-bag .item.bump { animation: bump .45s ease; }
@keyframes bump { 50% { transform: scale(1.14); } }
.bow-verdict {
  margin-top: 1.6rem; padding: 1rem 1.1rem; border-radius: var(--r);
  border: 1px solid var(--line); background: var(--card); font-size: .9rem; color: var(--ink-2);
}
.bow-verdict.same { border-color: var(--acid); background: color-mix(in oklab, var(--acid) 10%, transparent); color: var(--ink); }

/* ---------- takeaway ---------- */
.lb-take {
  margin-top: 2.4rem; padding: 1.2rem 1.3rem;
  border: 1px solid var(--line); border-left: 3px solid var(--acid);
  border-radius: var(--r); background: var(--card);
}
.lb-take h2 { border: 0; padding: 0; margin: 0 0 .5rem; font-size: 1.1rem; }
.lb-take p { font-size: .92rem; color: var(--ink-2); margin: 0 0 .6rem; }
.lb-take p:last-child { margin-bottom: 0; }
.lb-take a { color: var(--acid); }

/* ---------- the lab index ---------- */
.lb-index { display: grid; gap: .8rem; grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr)); list-style: none; margin: 2rem 0 0; padding: 0; }
.lb-index li { border: 1px solid var(--line); border-radius: var(--r-lg); background: linear-gradient(180deg, var(--card), transparent 75%); transition: border-color .22s, transform .22s; }
.lb-index li:hover { border-color: var(--line-2); transform: translateY(-2px); }
.lb-index a { display: block; padding: 1.1rem 1.2rem; }
.lb-index .n { font-family: var(--mono); font-size: .68rem; letter-spacing: .16em; text-transform: uppercase; color: var(--acid); }
.lb-index h3 { font-size: 1rem; margin: .35rem 0 .5rem; }
.lb-index p { font-size: .82rem; color: var(--mut); line-height: 1.55; }