document.addEventListener('DOMContentLoaded', function() {
    // Smooth scrolling for anchor links
    document.querySelectorAll('a[href^="#"]').forEach(anchor => {
        anchor.addEventListener('click', function (e) {
            e.preventDefault();
            
            const targetId = this.getAttribute('href');
            if (targetId === '#') return;
            
            const targetElement = document.querySelector(targetId);
            if (targetElement) {
                window.scrollTo({
                    top: targetElement.offsetTop - 80,
                    behavior: 'smooth'
                });
                
                // Update URL without jumping
                history.pushState(null, null, targetId);
            }
        });
    });
    
    // Highlight active nav link on scroll
    const sections = document.querySelectorAll('section');
    const navLinks = document.querySelectorAll('.nav-link');
    
    window.addEventListener('scroll', () => {
        let current = '';
        
        sections.forEach(section => {
            const sectionTop = section.offsetTop;
            const sectionHeight = section.clientHeight;
            
            if (pageYOffset >= (sectionTop - 100)) {
                current = section.getAttribute('id');
            }
        });
        
        navLinks.forEach(link => {
            link.classList.remove('active');
            if (link.getAttribute('href') === `#${current}`) {
                link.classList.add('active');
            }
        });
    });
    
    // Add animation to elements when they come into view
    const animateOnScroll = () => {
        const elements = document.querySelectorAll('.animate-on-scroll');
        
        elements.forEach(element => {
            const elementPosition = element.getBoundingClientRect().top;
            const windowHeight = window.innerHeight;
            
            if (elementPosition < windowHeight - 100) {
                element.classList.add('animate-in');
            }
        });
    };
    
    // Run once on page load
    animateOnScroll();
    
    // Then run on scroll
    window.addEventListener('scroll', animateOnScroll);
    
    // Theme switcher functionality
    const themeToggle = document.getElementById('theme-toggle');
    if (themeToggle) {
        themeToggle.addEventListener('click', () => {
            document.documentElement.classList.toggle('dark');
            localStorage.setItem('darkMode', document.documentElement.classList.contains('dark'));
        });
    }
    
    // Check for saved theme preference
    if (localStorage.getItem('darkMode') === 'true') {
        document.documentElement.classList.add('dark');
    } else if (localStorage.getItem('darkMode') === 'false') {
        document.documentElement.classList.remove('dark');
    }
    
    // Form submission handler
    const contactForm = document.querySelector('#contact form');
    if (contactForm) {
        contactForm.addEventListener('submit', function(e) {
            e.preventDefault();
            
            // Simple form validation
            const name = this.querySelector('#name').value;
            const email = this.querySelector('#email').value;
            const message = this.querySelector('#message').value;
            
            if (!name || !email || !message) {
                alert('Please fill in all fields');
                return;
            }
            
            // Here you would typically send the form data to a server
            console.log('Form submitted:', { name, email, message });
            alert('Thank you for your message! I will get back to you soon.');
            this.reset();
        });
    }
});