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document.getElementById('letterSearch').addEventListener('input', function() { let query = this.value.toUpperCase(); let rows = document.querySelectorAll('table tbody tr'); rows.forEach(row => { let titleCell = row.querySelector('td:first-child'); if (!titleCell) return; let title = titleCell.textContent.toUpperCase(); if (query === "" || title.startsWith(query)) { row.style.display = ""; } else { row.style.display = "none"; } }); // hide empty sections (headings + tables without visible rows) document.querySelectorAll('h3[id^="sec-"]').forEach(h3 => { let table = h3.nextElementSibling; if (!table) return; let visibleRows = table.querySelectorAll('tbody tr:not([style*="display: none"])'); if (visibleRows.length === 0) { h3.style.display = "none"; table.style.display = "none"; } else { h3.style.display = ""; table.style.display = ""; } }); });