.chart-preview {
  min-height: 100vh;
  padding: var(--space-page-desktop);
  color: var(--color-text-primary);
}

.chart-preview__shell {
  max-width: 750px;
}

.chart-preview__header {
  margin-bottom: var(--space-section-gap);
}

.chart-preview__group:not(:last-child) {
  margin-bottom: var(--space-section-gap);
}

.chart-preview__group-label {
  margin-bottom: var(--space-8);
}

.ds-chart-card {
  display: flex;
  flex-direction: column;
  padding: var(--card-padding);
  background: var(--card-background);
  border: var(--card-border-defined);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow-defined);
}

.ds-chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--chart-header-gap);
}

.ds-chart-heading {
  display: flex;
  flex-direction: column;
  gap: var(--chart-heading-gap);
  min-width: 0;
}

.ds-chart-eyebrow {
  letter-spacing: var(--letter-spacing-label); /* micro-label majuscule tracké (cohérence eyebrows DS) */
  color: var(--color-text-muted);
}

.ds-chart-title {
  color: var(--color-text-primary);
}

.ds-chart-add-btn {
  flex-shrink: 0;
}

.ds-chart-add-btn svg {
  stroke-width: var(--icon-stroke-width-bold);
}

.ds-chart-shell {
  position: relative;
  min-height: var(--chart-shell-min-height);
  margin-top: var(--space-32);
}

.ds-chart-shell--empty {
  display: grid;
  place-items: center;
}

.ds-chart-canvas {
  display: block;
  width: 100%;
  height: 100%;
  min-height: var(--chart-shell-min-height);
  font-size: var(--chart-axis-font-size);
}

/* ── Pastilles survolables : une par mesure, posées sur la courbe ──
   Calque en absolute au-dessus du canvas (positionné par chart.js). La bulle
   affiche la valeur saisie au survol du point, comme sur le dashboard legacy. */
.ds-chart-point-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.ds-chart-point {
  position: absolute;
  z-index: 3;
  width: var(--chart-point-size);
  height: var(--chart-point-size);
  padding: 0;
  border: var(--chart-point-border);
  border-radius: var(--radius-full);
  background: var(--chart-point-background);
  transform: translate(-50%, -50%);
  cursor: pointer;
  pointer-events: auto;
}

.ds-chart-point:hover,
.ds-chart-point:focus-visible,
.ds-chart-point.is-active {
  outline: none;
  background: var(--chart-point-hover-background);
  box-shadow: var(--chart-point-hover-ring);
}

/* Valeur (bulle) au-dessus du point, date en-dessous — révélées au survol. */
.ds-chart-point__value,
.ds-chart-point__date {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  line-height: 1;
  white-space: nowrap;
  text-align: center;
  pointer-events: none;
  opacity: 0;
  transition: opacity 120ms ease, transform 120ms ease;
}

.ds-chart-point__value {
  bottom: calc(100% + var(--space-8));
  min-width: var(--space-24);
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-sm);
  background: var(--chart-point-label-background);
  color: var(--chart-point-label-text);
  font-size: var(--type-caption-size);
  font-weight: var(--font-weight-bold);
}

.ds-chart-point__date {
  top: calc(100% + var(--space-8));
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-sm);
  background: var(--chart-point-label-background);
  color: var(--chart-point-label-text);
  font-size: var(--type-caption-size);
  font-weight: var(--font-weight-medium);
}

.ds-chart-point:hover .ds-chart-point__value,
.ds-chart-point:focus-visible .ds-chart-point__value,
.ds-chart-point.is-active .ds-chart-point__value {
  opacity: 1;
  transform: translateX(-50%) translateY(-2px);
}

.ds-chart-point:hover .ds-chart-point__date,
.ds-chart-point:focus-visible .ds-chart-point__date,
.ds-chart-point.is-active .ds-chart-point__date {
  opacity: 1;
  transform: translateX(-50%) translateY(2px);
}

@media (max-width: 640px) {
  .chart-preview {
    padding: var(--space-page-mobile);
  }
}