.chart-oc-hierarchy-tree {
    background: #f8fafc;
    border-radius: 12px;
    margin-top: 10px;
    border: 1px solid #e2e8f0;
    overflow: hidden;
}

.chart-oc-d3-container {
    background-color: #f8fafc;
    border-radius: 12px;
}

.chart-oc-loader {
    text-align: center;
    color: #64748b;
    padding: 60px 40px;
    font-size: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.chart-oc-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid #e2e8f0;
    border-top: 3px solid #3b82f6;
    border-radius: 50%;
    animation: chart-oc-spin 1s linear infinite;
    margin-bottom: 10px;
}

@keyframes chart-oc-spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.chart-oc-error {
    color: #ef4444;
    padding: 30px;
    text-align: center;
    font-weight: 500;
}