(function () {
    const kwota = document.getElementById('kwota');
    const opis = document.getElementById('opis');
    const opisCount = document.getElementById('opisCount');

    document.querySelectorAll('.btn-kwota').forEach(btn => {
        btn.addEventListener('click', () => {
            const val = btn.getAttribute('data-amount');
            if (val && kwota) {
                kwota.value = Number(val).toFixed(2);
                kwota.focus();
            }
        });
    });

    if (opis && opisCount) {
        const updateCount = () => opisCount.textContent = opis.value.length.toString();
        opis.addEventListener('input', updateCount);
        updateCount();
    }
})();