.burnup-chart-container {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    max-height: 500px;
    border-radius: 8px;
    overflow: hidden;
}

.burnup-chart-container.expired {
    opacity: 0.5;
}

.burnup-chart-canvas {
    display: block;
    width: 100%;
    height: 100%;
}

.burnup-chart-skeleton {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(30, 30, 46, 0.5);
    border-radius: 8px;
}

/* Mobile: slightly taller aspect ratio for readability */
@media (max-width: 600px) {
    .burnup-chart-container {
        aspect-ratio: 4 / 3;
        max-height: 350px;
    }
}