/* ───────────────────────────────────────────────────────────────────────
   TF-IDF · demo 2 "comparing two documents" — self-contained styles.

   Sandboxed iframe: carries its own theme (shared palette with demo 1 and the
   how-search-works demo). Layout flows to content height; demo.js sizes the
   iframe to fit. The similarity number is decomposed in place: a 0→1 meter
   whose filled part is split into one segment per shared word, so the reader
   sees the cosine literally built out of word contributions.
   ─────────────────────────────────────────────────────────────────────── */

:root {
  --bg: #fbfaf8;
  --panel: #ffffff;
  --text: #2c3142;
  --pale: #8a90a0;
  --line: #e6e3dd;
  --track: #ece9e3;
  --accent: #3b5bdb;   /* document A */
  --warm: #e8590c;     /* document B */
  --same: #ecf1ff;     /* same-cluster row tint */
  --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; --track: #2b2f38;
    --accent: #7aa2ff; --warm: #ffa94d; --same: #262c3b;
  }
}

* { 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; }
b sub { font-weight: 700; }

/* ── header + controls ─────────────────────────────────────────────────────*/
#objective { margin: 0 0 12px; max-width: 68ch; }
#controls { display: flex; flex-wrap: wrap; gap: 16px; }
#controls label {
  font-size: 0.8rem; color: var(--pale);
  display: inline-flex; align-items: center; gap: 8px;
}
#controls select {
  font: 600 0.88rem var(--sans);
  color: var(--text); background: var(--panel);
  border: 1px solid var(--line); border-radius: 6px; padding: 6px 8px;
  max-width: 15em;
}

/* ── stage: pair | ranking ──────────────────────────────────────────────────*/
#stage {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 24px;
  align-items: start;
  margin-top: 16px;
}
@media (max-width: 640px) { #stage { grid-template-columns: 1fr; } }

#pairhead, #rankhead { margin: 0 0 10px; font-size: 1.02rem; }
#pairhead .a { color: var(--accent); font-weight: 700; }
#pairhead .b { color: var(--warm); font-weight: 700; }

/* ── the meter: 0→1 track, filled part segmented by word ────────────────────*/
#meter {
  position: relative;
  height: 26px;
  background: var(--track);
  border-radius: 6px;
  overflow: hidden;
}
#stack { display: flex; height: 100%; width: 100%; }
#stack .seg { height: 100%; transition: width .35s ease; }
#stack .seg.rest { background: var(--pale); opacity: .5; }
#tick0, #tick1 {
  position: absolute; top: 50%; transform: translateY(-50%);
  font: 600 0.7rem var(--mono); color: var(--pale); pointer-events: none;
}
#tick0 { left: 6px; }
#tick1 { right: 6px; }

#scorenum { margin: 8px 0 4px; font-size: 0.92rem; color: var(--pale); }
#scorenum b { color: var(--text); font: 700 1.15rem var(--mono); }

/* ── contribution list ──────────────────────────────────────────────────────*/
#bkhead { margin: 16px 0 8px; font-size: 0.9rem; color: var(--text); max-width: 60ch; }
#bkhead b, #bkhead sub { font-family: var(--mono); }
#contribs { list-style: none; margin: 0; padding: 0; }
#contribs li {
  display: grid;
  grid-template-columns: 12ch 1fr 6ch;
  align-items: center; gap: 10px;
  padding: 2px 0;
}
#contribs .cw { font: 600 0.84rem var(--mono); color: var(--text);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#contribs .cbar { height: 12px; border-radius: 3px; min-width: 2px; }
#contribs .cv { font: 0.78rem var(--mono); color: var(--pale); text-align: right; }
#contribs li.rest .cw { color: var(--pale); font-weight: 400; font-style: italic; }
#contribs li.rest .cbar { background: var(--pale); opacity: .5; }

/* ── unique-words strip ─────────────────────────────────────────────────────*/
#unique {
  margin-top: 16px; padding: 10px 12px;
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius);
}
#uqlead { margin: 0 0 8px; font-size: 0.86rem; color: var(--text); }
#uqlead b { color: var(--warm); }
.uqrow { margin: 4px 0; font-size: 0.82rem; color: var(--pale); }
.uqrow .who { font-weight: 700; }
.uqrow .who.a { color: var(--accent); }
.uqrow .who.b { color: var(--warm); }
.chip {
  display: inline-block; margin: 2px 4px 2px 0; padding: 1px 6px;
  font: 0.78rem var(--mono);
  background: var(--track); border-radius: 4px; color: var(--text);
}
.chip .z { color: var(--pale); }

/* ── ranking panel ──────────────────────────────────────────────────────────*/
#ranks {
  border-left: 1px solid var(--line); padding-left: 22px;
}
@media (max-width: 640px) {
  #ranks { border-left: none; padding-left: 0; border-top: 1px solid var(--line); padding-top: 16px; }
}
#rankhead .a { color: var(--accent); font-weight: 700; }
#ranklist { list-style: none; margin: 0; padding: 0; }
#ranklist li {
  display: grid; grid-template-columns: 1fr 4ch; align-items: center;
  gap: 8px; padding: 5px 6px; border-radius: 5px; cursor: pointer;
}
#ranklist li:hover { background: var(--track); }
#ranklist li.same { background: var(--same); }
#ranklist li.cur { outline: 2px solid var(--warm); outline-offset: -2px; }
#ranklist .rk { font-size: 0.82rem; color: var(--text); }
#ranklist .rk .rbar {
  display: block; height: 5px; margin-top: 3px; border-radius: 3px;
  background: var(--accent); min-width: 1px;
}
#ranklist li.cur .rbar { background: var(--warm); }
#ranklist .rv { font: 0.76rem var(--mono); color: var(--pale); text-align: right; }
#ranknote {
  margin: 12px 0 0; font-size: 0.82rem; color: var(--pale);
  max-width: 30ch; line-height: 1.5;
}

#credit { margin-top: 18px; font-size: 0.74rem; color: var(--pale); }
#credit a { color: inherit; }