/* ComboChart — combined column + line scaffold. Background activity bars with a
   line series overlaid (and optional event dots + a highlighted column). Used
   for "posting time vs follower activity"-style overlays.
   Chart-norm rebuild (owner decision 2026-07-07): rounded columns wearing
   the brand-cyan sequential ramp BY VALUE (light→dark — never a wall of deep
   fills, never gray), a labeled y-axis for the bars, ink markers pinned on
   the slots you posted in (each post's engagement lives on its marker — the
   unlabeled overlay line was retired as unreadable), and a black anchor +
   chip on the best slot. Time series are ONE BAR PER SLOT at a uniform step
   (owner catch 2026-07-08: the old specimen mixed 1h/2h/3h bins and shoved a
   "7–9p" range into the tick row — an "hourly" chart shows 24 hourly bars,
   and the peak is a single slot, not a bin). Token-driven; hover read-out
   driven by a small specimen script. Visual source: tokens.css. */

.combo {
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: 100%;
  max-width: 1126px;
  padding: 21px;
  background: var(--canvas);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-1);
  font-family: var(--font-sans);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

.combo__head {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.combo__title {
  margin: 0;
  font-size: var(--fs-6);
  font-weight: var(--fw-heavy);
  letter-spacing: -0.01em;
}
.combo__sub {
  margin: 2px 0 0;
  font-size: var(--fs-2);
  color: var(--text-4);
}

/* Legend mixes a square (bars), a line (overlay) and a dot (events). */
.combo__legend {
  display: flex;
  align-items: center;
  gap: 16px;
}
.combo__legend-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--fs-2);
  color: var(--text-3);
  white-space: nowrap;
}
.combo__swatch--bar {
  width: 10px;
  height: 10px;
  border-radius: var(--r-full);
  background: var(--chart-seq-500);
  flex: none;
}
.combo__swatch--dot {
  width: 6px;
  height: 6px;
  border-radius: var(--r-full);
  background: var(--ink-900);
  flex: none;
}

/* Body: labeled y-axis gutter + stretch plot. */
.combo__body {
  display: flex;
  gap: 10px;
}
.combo__yaxis {
  position: relative;
  flex: none;
  width: 34px;
}
.combo__ytick {
  position: absolute;
  right: 0;
  transform: translateY(-50%);
  font-size: var(--fs-2);
  color: var(--text-4);
  font-variant-numeric: tabular-nums;
}

/* Plot. */
.combo__plot {
  position: relative;
  flex: 1;
  min-width: 0;
}
.combo__plot svg {
  display: block;
  width: 100%;
  height: auto;
}
.combo__grid {
  stroke: var(--border);
  stroke-width: 1;
}
.combo__baseline {
  stroke: var(--border-strong);
  stroke-width: 1;
}

/* Activity bars — sequential ramp by value; the best slot is the deep anchor. */
.combo__bar {
  transition: filter var(--dur-2) var(--ease-out);
}
.combo__bar:hover {
  filter: brightness(0.95) saturate(1.15);
}
.combo__bar--r200 {
  fill: var(--chart-seq-200);
}
.combo__bar--r300 {
  fill: var(--chart-seq-300);
}
.combo__bar--r400 {
  fill: var(--chart-seq-400);
}
.combo__bar--r500 {
  fill: var(--chart-seq-500);
}
.combo__bar--r600 {
  fill: var(--chart-seq-600);
}
/* The best slot — the one black anchor, paired with the pinned chip. */
.combo__bar--hot {
  fill: var(--chart-emphasis);
}

/* Pinned chip on the best slot. */
.combo__chip {
  position: absolute;
  transform: translate(-50%, calc(-100% - 8px));
  padding: 3px 9px;
  border-radius: var(--r-full);
  background: var(--ink-900);
  color: #fff;
  font-size: var(--fs-1);
  font-weight: var(--fw-heavy);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  pointer-events: none;
  box-shadow: var(--shadow-1);
}

/* You-posted rug marks — quiet ink ticks under the baseline; the posted
   slot's engagement rides its bar's read-out. */
.combo__rug circle {
  fill: var(--ink-900);
}
.combo__bar {
  outline: none;
  cursor: pointer;
}
.combo__bar:focus-visible {
  filter: brightness(0.95) saturate(1.15);
  stroke: var(--pulse-cyan-line);
  stroke-width: 3;
}

/* Shared hover readout (value leads, label follows). */
.chart-tip {
  position: absolute;
  pointer-events: none;
  transform: translate(-50%, calc(-100% - 10px));
  display: none;
  flex-direction: column;
  gap: 1px;
  padding: 7px 10px;
  border-radius: var(--r-md);
  background: var(--ink-900);
  color: #fff;
  font-size: var(--fs-2);
  line-height: 1.35;
  white-space: nowrap;
  box-shadow: var(--shadow-2);
  z-index: 2;
}
.chart-tip.is-visible {
  display: flex;
}
.chart-tip__value {
  font-weight: var(--fw-heavy);
  font-size: var(--fs-3);
  font-variant-numeric: tabular-nums;
}
.chart-tip__label {
  color: rgba(255, 255, 255, 0.72);
}

/* Time axis under the plot (offset past the y-axis gutter). A 24-column hour
   grid so each tick centers under its own bar — ticks land on real slots
   (place with an inline grid-column); never mix a range label into the row. */
.combo__axis {
  display: grid;
  grid-template-columns: repeat(24, 1fr);
  margin-top: 6px;
  padding: 0 4px 0 48px;
}
.combo__axis span {
  grid-row: 1;
  justify-self: center;
  font-size: var(--fs-2);
  color: var(--text-4);
}
.combo__axis .is-peak {
  color: var(--pulse-cyan-dark);
  font-weight: var(--fw-bold);
}

/* Stat-first hero — the widget leads with its number; the chart is evidence
   (owner-approved reference anatomy: kicker → hero value → chart). */
.combo__hero {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-top: -6px;
}
.combo__hero-value {
  font-size: var(--fs-9);
  font-weight: var(--fw-heavy);
  line-height: 1;
  letter-spacing: -0.02em;
}
.combo__hero-delta {
  font-size: var(--fs-2);
  font-weight: var(--fw-semibold);
  color: var(--text-3);
}