function daoaiHeaderInit() {

    // Mobile drawer
    var headers = document.querySelectorAll('.header-nav');
    headers.forEach(function(header) {
        var toggleBtn = header.querySelector('.header-mobile-toggle');
        var drawer = header.querySelector('.header-mobile-drawer');

        if (toggleBtn && drawer) {
            toggleBtn.addEventListener('click', function(e) {
                e.preventDefault();
                e.stopPropagation();
                drawer.classList.toggle('active');
                document.body.style.overflow = drawer.classList.contains('active') ? 'hidden' : '';
            });

            drawer.querySelectorAll('a').forEach(function(link) {
                link.addEventListener('click', function() {
                    drawer.classList.remove('active');
                    document.body.style.overflow = '';
                });
            });
        }
    });

    // Contact modal
    var contactModal = document.getElementById('daoai-contact-modal');
    if (!contactModal) return;

    var hsFormCreated = false;

    function loadHubSpotForm() {
        if (hsFormCreated) return;

        function createForm() {
            window.hbspt.forms.create({
                portalId: "39868957",
                formId: "b54e7e02-35d0-4367-955f-dd122da9dcf1",
                region: "na1",
                locale: "en",
                target: "#hs-contact-modal-form"
            });
            hsFormCreated = true;
        }

        if (window.hbspt) {
            createForm();
        } else {
            var script = document.createElement('script');
            script.charset = 'utf-8';
            script.src = '//js.hsforms.net/forms/embed/v2.js';
            script.onload = createForm;
            document.head.appendChild(script);
        }
    }

    function openContactModal() {
        contactModal.classList.add('is-open');
        document.body.style.overflow = 'hidden';
        loadHubSpotForm();

        var drawer = document.querySelector('.header-mobile-drawer');
        if (drawer) drawer.classList.remove('active');
    }

    function closeContactModal() {
        contactModal.classList.remove('is-open');
        document.body.style.overflow = '';
    }

    document.querySelectorAll('[data-contact-modal-trigger]').forEach(function(btn) {
        btn.addEventListener('click', function(e) {
            e.preventDefault();
            openContactModal();
        });
    });

    var closeBtn = contactModal.querySelector('[data-contact-modal-close]');
    if (closeBtn) closeBtn.addEventListener('click', closeContactModal);

    contactModal.addEventListener('click', function(e) {
        if (e.target === contactModal) closeContactModal();
    });

    document.addEventListener('keydown', function(e) {
        if (e.key === 'Escape' && contactModal.classList.contains('is-open')) closeContactModal();
    });

    // Intercept /contact-us links
    document.querySelectorAll('a[href="/contact-us"], a[href="https://daoai.com/contact-us"]').forEach(function(link) {
        link.addEventListener('click', function(e) {
            e.preventDefault();
            openContactModal();
        });
    });
}

if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', daoaiHeaderInit);
} else {
    daoaiHeaderInit();
}