/* ───────────────────────────────────────────────────────────────────────
   TF-IDF · demo 1 "the ablation" — self-contained styles.
   Runs in a sandboxed iframe, so it carries its own minimal theme (shared
   palette with the how-search-works demo) rather than inheriting the site CSS.
   Layout flows to content height; demo.js sizes the iframe to fit.
   ─────────────────────────────────────────────────────────────────────── */

:root {
  --bg: #fbfaf8;
  --panel: #ffffff;
  --text: #2c3142;
  --pale: #8a90a0;
  --line: #e6e3dd;
  --accent: #3b5bdb;
  --radius: 8px;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1c22; --panel: #23262e; --text: #d7dae2;
    --pale: #8a90a0; --line: #343844; --accent: #7aa2ff;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: var(--sans);
  color: var(--text);
  background: var(--bg);
  font-size: 15px;
  line-height: 1.45;
}
#demo { padding: 14px; }

/* ── header: objective + mode control + caption + colour legend ───────── */
#objective { margin: 0 0 12px; max-width: 62ch; }
#modes { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; }
#modes button {
  font: 600 0.9rem var(--sans);
  padding: 8px 16px;
  border: none;
  border-right: 1px solid var(--line);
  background: var(--panel);
  color: var(--pale);
  cursor: pointer;
}
#modes button:last-child { border-right: none; }
#modes button small { font-weight: 400; }
#modes button:hover { color: var(--text); }
#modes button.on { background: var(--accent); color: #fff; }

#caption {
  min-height: 2.6em;
  margin: 12px 0 6px;
  max-width: 68ch;
  font-size: 0.95rem;
}
#caption b { color: var(--accent); }

#rarity-legend {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  font-size: 0.78rem; color: var(--pale);
  margin-bottom: 14px;
}
#rarity-legend .grad {
  width: 110px; height: 8px; border-radius: 4px; display: inline-block;
  background: linear-gradient(90deg, hsl(224,8%,58%), hsl(224,72%,55%));
}
#rarity-legend .ends { letter-spacing: .02em; }

/* ── the document grid ────────────────────────────────────────────────── */
#grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 12px;
}
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 12px;
}
.card-title { font-weight: 700; font-size: 0.95rem; margin-bottom: 8px; }
.words { list-style: none; margin: 0; padding: 0; }
.words li {
  display: grid;
  grid-template-columns: 8.5em 1fr;
  align-items: center;
  gap: 8px;
  padding: 2px 4px;
  border-radius: 4px;
  cursor: pointer;
}
.words li:hover { background: rgba(59,91,219,.08); }
.words li.sel { background: rgba(59,91,219,.14); }
.words .w {
  font: 0.86rem var(--mono);
  color: var(--text);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.words .barwrap { height: 12px; }
.words .bar { display: block; height: 100%; border-radius: 3px; min-width: 3px; }

/* ── inspector line (click a word) ────────────────────────────────────── */
#detail {
  margin: 16px 0 6px;
  padding: 10px 12px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  font: 0.86rem var(--mono);
  line-height: 1.6;
}
#detail .k { color: var(--pale); }
#detail .v { color: var(--text); font-weight: 700; }
#detail .win { color: var(--accent); }

#credit { margin-top: 16px; font-size: 0.74rem; color: var(--pale); }
#credit a { color: inherit; }

@media (max-width: 640px) {
  .words li { grid-template-columns: 7em 1fr; }
}