/* ===========================================================
   dashboard.css — biểu đồ & thẻ thống kê dashboard
   =========================================================== */
.chart-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin: 8px 0 24px;
}
.chart-card {
    background: var(--surface, #fff);
    border: 1px solid var(--border, #e2e8f0);
    border-radius: var(--radius, 14px);
    padding: 18px;
    box-shadow: var(--shadow-sm, 0 1px 2px rgba(15,23,42,.08));
    min-height: 300px;
    display: flex;
    flex-direction: column;
}
.chart-card h3 {
    margin: 0 0 12px;
    font-size: 17px;
    color: var(--ink, #0f172a);
}
.chart-canvas-wrap {
    position: relative;
    flex: 1;
    min-height: 240px;
}
.chart-fallback {
    color: var(--ink-3, #94a3b8);
    font-size: 13.5px;
    padding: 10px 0;
}
.chart-fallback table { width: 100%; border-collapse: collapse; font-size: 13px; }
.chart-fallback th, .chart-fallback td { padding: 6px 8px; border-bottom: 1px solid var(--border, #e2e8f0); text-align: left; }
.chart-loading { color: var(--ink-3, #94a3b8); font-size: 13px; padding: 20px 0; text-align: center; }

@media (max-width: 900px) {
    .chart-grid { grid-template-columns: 1fr; }
}