function toggleForm(id) {
    const el = document.getElementById(id);
    if (el) el.classList.toggle('hidden');
}

// Auto-close flash messages
document.addEventListener('DOMContentLoaded', () => {
    const alerts = document.querySelectorAll('.alert-success');
    alerts.forEach(a => setTimeout(() => { a.style.opacity = '0'; a.style.transition = 'opacity .4s'; setTimeout(() => a.remove(), 400); }, 4000));
});