Hairline stat strip

<p class="cap">Reporting only — the figures are the whole job.</p>
<div class="hss-strip">
  <div class="hss-tile"><span class="l">Documents</span><span class="f">1,482</span><span class="u">this period</span></div>
  <div class="hss-tile"><span class="l">Median time</span><span class="f">3.2s</span><span class="u">last 24h</span></div>
  <div class="hss-tile"><span class="l">Clean runs</span><span class="f">98.4%</span><span class="u">no retries</span></div>
  <div class="hss-tile"><span class="l">Quality score</span><span class="f none" aria-label="no value">—</span><span class="u">not rated yet</span></div>
</div>

<div class="hss-strip five" role="group" aria-label="Filter downloads by status">
  <button class="hss-tile" type="button" aria-pressed="false" data-status="All"><span class="l">All</span><span class="f">6</span><span class="u">downloads</span></button>
  <button class="hss-tile" type="button" aria-pressed="false" data-status="Queued"><span class="l">Queued</span><span class="f">2</span><span class="u">downloads</span></button>
  <!-- Downloading · Done · Failed follow the same shape -->
</div>
<ul class="dl-list"><li data-status="Done"><span>Bicycle drivetrain teardown</span><span class="s">Done</span></li> …</ul>
<p class="live" role="status" aria-live="polite">Showing all 6 downloads.</p>

Colors come from shared theme tokens — --surface, --ink, --border, --accent and friends — so this CSS carries no palette of its own. Use Runnable file to copy the tokens along with it.

.stage { container-type: inline-size; }
.hss-strip {
  display: grid;
  gap: 1px;                         /* the hairline IS the gap */
  background: var(--border);        /* container paints the line colour */
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  grid-template-columns: 1fr;
}
@container (min-width: 21rem) { .hss-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@container (min-width: 42rem) {
  .hss-strip { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .hss-strip.five { grid-template-columns: repeat(5, minmax(0, 1fr)); }
}
.hss-tile { background: var(--surface); padding: .9rem 1rem; display: grid; gap: .15rem; min-width: 0; }
.hss-tile .l { font: 500 .8125rem/1.3 ui-monospace, monospace; text-transform: uppercase; letter-spacing: .06em; color: var(--dim); overflow-wrap: anywhere; }
.hss-tile .f { font-size: 1.6rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.hss-tile .f.none { color: var(--dim); font-weight: 400; }
button.hss-tile[aria-pressed="true"] { background: color-mix(in srgb, var(--accent) 14%, var(--surface)); }

const tiles = [...document.querySelectorAll('button.hss-tile')];
const rows = [...document.querySelectorAll('.dl-list li')];
const live = document.querySelector('.live');

tiles.forEach((tile) => tile.addEventListener('click', () => {
  const wasOn = tile.getAttribute('aria-pressed') === 'true';
  const status = wasOn ? 'All' : tile.dataset.status;
  tiles.forEach((other) => other.setAttribute('aria-pressed', String(!wasOn && other === tile && status !== 'All')));
  // counts on the tiles come from the unfiltered set, so they never change here
  const shown = rows.filter((row) => (row.hidden = !(status === 'All' || row.dataset.status === status)) === false).length;
  live.textContent = status === 'All'
    ? `Showing all ${rows.length} downloads.`
    : `Filtered to ${status}: ${shown} of ${rows.length}. Press the lit tile again to clear.`;
}));