document.addEventListener('DOMContentLoaded', function () {
    const navbar = document.querySelector('.navbar');
    const contactForm = document.getElementById('contactForm');

    // Navbar shrink on scroll
    window.addEventListener('scroll', () => {
        if (window.scrollY > 50) {
            navbar.classList.add('navbar-scrolled');
        } else {
            navbar.classList.remove('navbar-scrolled');
        }
    });

    // Smooth scrolling for anchor links
    document.querySelectorAll('a[href^="#"]').forEach(anchor => {
        anchor.addEventListener('click', function (e) {
            e.preventDefault();
            document.querySelector(this.getAttribute('href')).scrollIntoView({
                behavior: 'smooth'
            });
        });
    });

    // Basic client-side form validation
    if (contactForm) {
        contactForm.addEventListener('submit', function(e) {
            e.preventDefault();
            let isValid = true;
            const name = document.getElementById('name');
            const email = document.getElementById('email');
            const message = document.getElementById('message');

            // Reset states
            [name, email, message].forEach(f => {
                f.classList.remove('is-invalid');
            });

            if (name.value.trim() === '') {
                name.classList.add('is-invalid');
                isValid = false;
            }
            if (email.value.trim() === '' || !/^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$/.test(email.value)) {
                email.classList.add('is-invalid');
                isValid = false;
            }
            if (message.value.trim() === '') {
                message.classList.add('is-invalid');
                isValid = false;
            }

            if (isValid) {
                // On a real site, you'd submit this via AJAX.
                // For this demo, we'll just show an alert.
                alert('Thank you for your message! We will get back to you soon.');
                contactForm.reset();
            }
        });
    }
});