school_compare/nextjs-app/components/SatsChart.module.css

/* SatsChart — Cascade bar chart for KS2 SATs results */

.container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
  padding-top: 0.25rem;
}

/* ── Individual subject column ── */
.subjectChart {
  position: relative;
}

.subjectName {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.chartArea {
  position: relative;
  padding-bottom: 0.25rem;
}

/* ── Gridlines ── */
.gridlines {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 20px;
  pointer-events: none;
}

.gridline {
  position: absolute;
  top: 0;
  height: 100%;
  width: 1px;
  background: var(--bg-secondary);
}

/* ── Per-bar national average marker ──
   Each bar compares against its own benchmark (expected vs higher standard /
   greater depth), so the marker sits on the individual bar's track rather than
   as one line spanning both bars. */
/*
 * Knockout, not a colour.
 *
 * This marker was var(--brand) — the same value as .barExpected and
 * .barExceeding, so wherever it crossed a bar it measured 1.00:1 and was not
 * rendered distinguishably at all. It scored 5.47:1 only against the empty
 * track, which means it was visible precisely when a school was BELOW the
 * national average and vanished for every school at or above it.
 *
 * No single colour fixes this, because the marker's position is data-driven:
 * it can land on the bar, on the empty track, or straddle the boundary. So it
 * is drawn as a knockout — a light core carrying a dark edge. On the teal bar
 * the core reads; on the pale track the edge reads. Both tokens flip with the
 * theme, so the pairing holds in dark mode too.
 *
 * The edge is box-shadow rather than border so it costs no layout width and
 * cannot shift the 50% translate.
 */
.natTick {
  position: absolute;
  top: -3px;
  bottom: -3px;
  width: 3px;
  transform: translateX(-50%);
  background: var(--bg-card);
  box-shadow: 0 0 0 1px var(--text-primary);
  border-radius: 2px;
  z-index: 4;
  pointer-events: none;
}

.natTick::before {
  content: '';
  position: absolute;
  top: -4px;
  left: 50%;
  transform: translateX(-50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--bg-card);
  box-shadow: 0 0 0 1px var(--text-primary);
}

.barHeaderRight {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
}

.natLabel {
  font-size: 0.55rem;
  font-weight: 700;
  color: var(--brand-strong);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

/* ── Bar rows ── */
.barGroup {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding-top: 0.9rem;
}

.barRow {
  display: flex;
  flex-direction: column;
  gap: 0.18rem;
}

.barHeader {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
}

.barTrack {
  width: 100%;
  height: 14px;
  position: relative;
}

.bar {
  height: 100%;
  border-radius: 4px;
  position: relative;
  transition: width 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/*
 * Expected and Exceeding were both var(--brand) — one colour for two series,
 * distinguished only by which row you were looking at, while the legend
 * claimed two.
 *
 * They are a sequential pair, not two categories: "exceeding" is a subset of
 * the same cohort at a harder bar. So they take two steps of the same hue
 * rather than two different hues, with the harder measure the more intense
 * step. --brand-stronger is darker than --brand in the light theme and lighter
 * in the dark one, which is the right direction in both: further from the
 * ground.
 */
.barExpected {
  background: var(--brand);
}

.barExceeding {
  background: var(--brand-stronger);
}

.barLabel {
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  position: relative;
  z-index: 3;
}

.barLabelSuffix {
  font-weight: 500;
  color: var(--text-muted);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ── Ruler ── */
.ruler {
  position: relative;
  height: 14px;
  margin-top: 0.3rem;
  border-top: 1px solid var(--border);
}

.rulerTick {
  position: absolute;
  top: 0;
  width: 1px;
  height: 3px;
  background: var(--border);
}

.rulerLabel {
  position: absolute;
  top: 5px;
  font-size: 0.5rem;
  font-weight: 500;
  color: var(--text-muted);
  transform: translateX(-50%);
  letter-spacing: 0.01em;
  opacity: 0.7;
}

/* Anchor first/last labels to edges */
.rulerLabelFirst {
  transform: translateX(0);
}

.rulerLabelLast {
  transform: translateX(-100%);
}

/* ── Legend ── */
.legend {
  margin-top: 1rem;
  display: flex;
  gap: 1.25rem;
  justify-content: center;
}

.legendItem {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--text-muted);
}

.legendSwatch {
  width: 8px;
  height: 8px;
  border-radius: 3px;
  flex-shrink: 0;
}

/* ── Responsive ── */
@media (max-width: 640px) {
  .container {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .legend {
    flex-wrap: wrap;
    gap: 0.75rem;
  }
}