// Service Worker Registration for Offline Capability
if ('serviceWorker' in navigator) {
    window.addEventListener('load', () => {
        navigator.serviceWorker.register('/sw.js')
            .then(reg => console.log('Service Worker registered', reg))
            .catch(err => console.log('Service Worker registration failed', err));
    });
}

// Interactivity for Attendance Toggles
document.addEventListener('DOMContentLoaded', () => {
    const tableRows = document.querySelectorAll('#learnersTable tbody tr');
    
    tableRows.forEach(row => {
        const presentBtn = row.querySelector('label[for^="pres_"]');
        const absentBtn = row.querySelector('label[for^="abs_"]');
        
        // Add subtle feedback on change
        const inputs = row.querySelectorAll('input[type="radio"]');
        inputs.forEach(input => {
            input.addEventListener('change', () => {
                row.classList.add('table-primary');
                setTimeout(() => row.classList.remove('table-primary'), 500);
            });
        });
    });
});