/* ───────────────────────────────────────────────────────────────────────
   TF-IDF · demo 3 "compare your own text" — self-contained styles.

   Same palette + meter/contribution vocabulary as demo 2, so the reader sees
   the identical machinery applied to text they supply. Two paste boxes feed a
   live cosine; rarity (IDF) is judged against the same background library the
   earlier demos used, so common words stay discounted even in unseen text.
   ─────────────────────────────────────────────────────────────────────── */

:root {
  --bg: #fbfaf8;
  --panel: #ffffff;
  --text: #2c3142;
  --pale: #8a90a0;
  --line: #e6e3dd;
  --track: #ece9e3;
  --accent: #3b5bdb;   /* text A */
  --warm: #e8590c;     /* text B */
  --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;
  }
}

* { 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; }

#objective { margin: 0 0 14px; max-width: 68ch; }

/* ── paste boxes ────────────────────────────────────────────────────────────*/
#panes { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 560px) { #panes { grid-template-columns: 1fr; } }
.pane { display: flex; flex-direction: column; gap: 5px; }
.pane label { font-size: 0.8rem; font-weight: 700; }
.pane label.a { color: var(--accent); }
.pane label.b { color: var(--warm); }
.pane textarea {
  width: 100%; min-height: 118px; resize: vertical;
  font: 0.86rem/1.5 var(--sans); color: var(--text);
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 9px 11px;
}
.pane textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
.pane:last-child textarea:focus { outline-color: var(--warm); }

/* ── example chips ──────────────────────────────────────────────────────────*/
#examples { margin-top: 10px; display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.exlabel { font-size: 0.8rem; color: var(--pale); }
#exbtns { display: inline-flex; flex-wrap: wrap; gap: 6px; }
.exbtn {
  font: 600 0.78rem var(--sans); color: var(--text);
  background: var(--track); border: 1px solid var(--line);
  border-radius: 999px; padding: 3px 11px; cursor: pointer;
}
.exbtn:hover { border-color: var(--accent); }

/* ── output ─────────────────────────────────────────────────────────────────*/
#out { margin-top: 20px; }
#empty { color: var(--pale); font-size: 0.9rem; font-style: italic; }

#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 .3s 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); }
#scorenum .verdict { color: var(--text); font-weight: 600; font-family: var(--sans); }

#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: 14ch 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; }

#sharednote { margin: 10px 0 0; font-size: 0.84rem; color: var(--pale); max-width: 60ch; }
#sharednote b { color: var(--text); }

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