.chart-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-4);
}

.chart-box {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--spacing-3);
}

.chart-box h3 {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

/*
 * Chart.js with maintainAspectRatio:false needs a parent with an explicit,
 * non-content-derived height. Without this, the canvas sizes itself off
 * its parent while the parent (via .chart-box's natural sizing) sizes
 * itself off the canvas — each resize triggers another, growing forever.
 */
.chart-canvas {
    position: relative;
    width: 100%;
    height: 220px;
}

@media (min-width: 480px) {
    .chart-canvas {
        height: 240px;
    }
}

@media (min-width: 768px) {
    .chart-grid {
        grid-template-columns: 1fr 1fr;
    }

    .chart-canvas {
        height: 280px;
    }
}

@media (min-width: 1200px) {
    .chart-grid {
        grid-template-columns: 1fr 1fr 1fr;
    }
}