function exportItemSalesCSV() {
    var cfg = document.getElementById('tab-item-sales-cfg');
    var itemTitle = cfg.dataset.itemTitle;
    var table = document.getElementById('item-sales-table');
    if (!table) return;
    var rows = table.querySelectorAll('tbody tr');
    var csv = 'Date,Buyer,Amount,Status\n';
    rows.forEach(function(row) {
        var cells = row.querySelectorAll('td');
        if (cells.length < 4) return;
        csv += '"' + cells[0].textContent.trim() + '","'
             + cells[1].textContent.trim() + '","'
             + cells[2].textContent.trim() + '","'
             + cells[3].textContent.trim() + '"\n';
    });
    var blob = new Blob([csv], { type: 'text/csv' });
    var a = document.createElement('a');
    a.href = URL.createObjectURL(blob);
    a.download = itemTitle + '-sales.csv';
    a.click();
}