// ============================================
// MARKE MACHT. – JavaScript
// ============================================

// --- Navigation Scroll Effect ---
const nav = document.getElementById('nav');

const handleNavScroll = () => {
    if (window.scrollY > 50) {
        nav.classList.add('scrolled');
    } else {
        nav.classList.remove('scrolled');
    }
};

window.addEventListener('scroll', handleNavScroll);
window.addEventListener('load', handleNavScroll);

// --- Mobile Menu Toggle ---
const navToggle = document.getElementById('navToggle');
const navMobile = document.getElementById('navMobile');

if (navToggle && navMobile) {
    navToggle.addEventListener('click', () => {
        navMobile.classList.toggle('active');
        document.body.style.overflow = navMobile.classList.contains('active') ? 'hidden' : '';
    });

    // Close mobile menu on link click
    const mobileLinks = navMobile.querySelectorAll('a');
    mobileLinks.forEach(link => {
        link.addEventListener('click', () => {
            navMobile.classList.remove('active');
            document.body.style.overflow = '';
        });
    });
}

// --- Smooth Scroll for Anchor Links ---
document.querySelectorAll('a[href^="#"]').forEach(anchor => {
    anchor.addEventListener('click', function(e) {
        const href = this.getAttribute('href');
        if (href === '#') return;
        
        e.preventDefault();
        const target = document.querySelector(href);
        if (target) {
            const navHeight = nav.offsetHeight;
            const targetPosition = target.getBoundingClientRect().top + window.scrollY - navHeight - 20;
            
            window.scrollTo({
                top: targetPosition,
                behavior: 'smooth'
            });
        }
    });
});

// --- Intersection Observer for Animations ---
const observerOptions = {
    threshold: 0.1,
    rootMargin: '0px 0px -50px 0px'
};

const observer = new IntersectionObserver((entries) => {
    entries.forEach(entry => {
        if (entry.isIntersecting) {
            entry.target.classList.add('visible');
            observer.unobserve(entry.target);
        }
    });
}, observerOptions);

// Observe elements with animation classes
document.querySelectorAll('.symptom-card, .quote-block, .intro-block, .cta-block').forEach(el => {
    observer.observe(el);
});

// --- Active Navigation Link ---
const setActiveNavLink = () => {
    const currentPage = window.location.pathname.split('/').pop() || 'index.html';
    const navLinks = document.querySelectorAll('.nav-link, .nav-mobile-link');
    
    navLinks.forEach(link => {
        const href = link.getAttribute('href');
        if (href === currentPage || (currentPage === '' && href === 'index.html')) {
            link.classList.add('active');
        } else {
            link.classList.remove('active');
        }
    });
};

window.addEventListener('load', setActiveNavLink);