#central-atom-display {
    text-align: center;
    font-size: 1.1rem;
    margin: 0.5rem 0;
    padding: 8px 16px;
    background: #f8f9fa;
    border-radius: 8px;
    border: 1px solid #dee2e6;
}

#domain-info {
    display: none;
    margin-left: 1rem;
    color: #28a745;
    font-weight: 600;
}

#domain-info.visible {
    display: inline;
}

.geometry-btn {
    padding: 10px 20px;
    font-size: 0.95rem;
    min-width: 140px;
    text-transform: capitalize;
}