/* =========================================================
   OVERVIEW - KPI, charts grid, loading overlay
   ========================================================= */

/* ---------- KPI ---------- */
.kpi-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.kpi-card {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: 8px;
  padding: 14px 16px;
  border-left: 4px solid var(--accent-primary);
  position: relative;
}

.kpi-label {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.kpi-value {
  font-size: 26px;
  font-weight: 700;
  color: var(--accent-dark);
  margin-top: 4px;
  transition: opacity 0.15s ease;
}

/* ---------- CHARTS GRID ---------- */
.charts-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.chart-card {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: 8px;
  padding: 14px 16px;
  position: relative;
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.chart-title {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.chart-clickable-hint {
  font-size: 11px;
  color: var(--accent-primary);
  background: var(--accent-bg-light);
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 500;
}

/* Trend mensile a tutta larghezza */
.chart-trend-mensile {
  grid-column: 1 / -1;
}

.js-plotly-plot {
  transition: opacity 0.15s ease;
}

/* =========================================================
   FEEDBACK VISIVO DURANTE I CALLBACK
   La classe "is-loading" viene aggiunta su .charts-grid e .kpi-row
   da clientside callback in callbacks/main.py al cambio del filter-store,
   e tolta quando arrivano i risultati.
   ========================================================= */

/* contenuto sbiadisce */
.charts-grid.is-loading .js-plotly-plot,
.kpi-row.is-loading .kpi-value {
  opacity: 0.35;
  pointer-events: none;
}

/* overlay con spinner sopra ogni chart-card */
.loading-overlay {
  position: absolute;
  inset: 40px 0 0 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s ease;
  z-index: 5;
}
.charts-grid.is-loading .loading-overlay {
  opacity: 1;
}

.loading-spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border-default);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: cai-spin 0.8s linear infinite;
}

/* Responsive */
@media (max-width: 900px) {
  .charts-grid { grid-template-columns: 1fr; }
}