// Smooth scrolling for navigation links
document.addEventListener('DOMContentLoaded', function() {
    // Smooth scrolling
    const navLinks = document.querySelectorAll('.nav-link');
    
    navLinks.forEach(link => {
        link.addEventListener('click', function(e) {
            e.preventDefault();
            const targetId = this.getAttribute('href');
            const targetSection = document.querySelector(targetId);
            
            if (targetSection) {
                const offsetTop = targetSection.offsetTop - 60; // Adjust for fixed header
                window.scrollTo({
                    top: offsetTop,
                    behavior: 'smooth'
                });
                
                // Close mobile menu if open
                const navMenu = document.querySelector('.nav-menu');
                const hamburger = document.querySelector('.hamburger');
                navMenu.classList.remove('active');
                hamburger.classList.remove('active');
            }
        });
    });
    
    // Mobile menu toggle
    const hamburger = document.querySelector('.hamburger');
    const navMenu = document.querySelector('.nav-menu');
    
    hamburger.addEventListener('click', function() {
        navMenu.classList.toggle('active');
        this.classList.toggle('active');
    });
    
    // Close mobile menu when clicking outside
    document.addEventListener('click', function(e) {
        if (!hamburger.contains(e.target) && !navMenu.contains(e.target)) {
            navMenu.classList.remove('active');
            hamburger.classList.remove('active');
        }
    });
    
    // Sticky navbar effect
    const navbar = document.querySelector('.navbar');
    let lastScrollY = window.scrollY;
    
    window.addEventListener('scroll', function() {
        if (window.scrollY > 100) {
            navbar.style.background = 'rgba(255, 255, 255, 0.95)';
        } else {
            navbar.style.background = 'rgba(255, 255, 255, 0.8)';
        }
        
        // Hide navbar on scroll down, show on scroll up
        if (window.scrollY > lastScrollY && window.scrollY > 200) {
            navbar.style.transform = 'translateY(-100%)';
        } else {
            navbar.style.transform = 'translateY(0)';
        }
        
        lastScrollY = window.scrollY;
    });
    
    // Lazy loading for images
    const lazyImages = document.querySelectorAll('img[loading="lazy"]');
    
    if ('IntersectionObserver' in window) {
        const imageObserver = new IntersectionObserver((entries, observer) => {
            entries.forEach(entry => {
                if (entry.isIntersecting) {
                    const img = entry.target;
                    img.src = img.src;
                    imageObserver.unobserve(img);
                }
            });
        });
        
        lazyImages.forEach(img => imageObserver.observe(img));
    }
    
    // Add subtle animations on scroll
    const observerOptions = {
        threshold: 0.1,
        rootMargin: '0px 0px -50px 0px'
    };
    
    const observer = new IntersectionObserver(function(entries) {
        entries.forEach(entry => {
            if (entry.isIntersecting) {
                entry.target.style.opacity = '1';
                entry.target.style.transform = 'translateY(0)';
            }
        });
    }, observerOptions);
    
    // Observe sections for animation
    const sections = document.querySelectorAll('.section');
    sections.forEach(section => {
        section.style.opacity = '0';
        section.style.transform = 'translateY(20px)';
        section.style.transition = 'opacity 0.6s ease, transform 0.6s ease';
        observer.observe(section);
    });
});