   if (width < 576) {
                    // XS: Full width, stack vertically
                    item.style.background = '#fef2f2';
                    item.style.borderColor = '#dc2626';
                    item.innerHTML = `<strong>Column ${index + 1} (XS)</strong><br><small class="text-muted">Full width - stacked vertically</small>`;
                } else if (width < 768) {
                    // SM: 2 per row
                    item.style.background = '#fef3c7';
                    item.style.borderC