.csv-input, .xml-output { font-family: 'Courier New', monospace; font-size: 0.9rem; }
        .preview-xml { max-height: 250px; overflow-y: auto; border: 1px solid var(--border-color); border-radius: 6px; background: #f8f9fa; padding: 1rem; }
        .example-buttons { display: flex; flex-wrap: wrap; gap: 0.6rem; margin: 1rem 0; }
        .loading-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.5);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 9999;
            visibility: hidden;
        }
        .loading-overlay.active { visibility: visible; }
        .spinner-border { width: 3rem; height: 3rem; }