document.addEventListener('DOMContentLoaded', function() {
            // Set up Three.js particle background
            const scene = new THREE.Scene();
            const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
            const renderer = new THREE.WebGLRenderer({ alpha: true });
            renderer.setSize(window.innerWidth, window.innerHeight);
            document.getElementById('particles-bg').appendChild(renderer.domElement);
            
            // Create particles
            const particlesGeometry = new THREE.BufferGeometry();
            const particlesCount = 7000;
            const posArray = new Float32Array(particlesCount * 3);
            const colorArray = new Float32Array(particlesCount * 3);
            
            for (let i = 0; i < particlesCount * 3; i += 3) {
                // Position
                posArray[i] = (Math.random() - 0.5) * 150;
                posArray[i + 1] = (Math.random() - 0.5) * 150;
                posArray[i + 2] = (Math.random() - 0.5) * 150;
                
                // Color
                colorArray[i] = Math.random() * 0.5 + 0.5; // R: 0.5-1.0
                colorArray[i + 1] = Math.random() * 0.3;   // G: 0-0.3
                colorArray[i + 2] = Math.random() * 0.5 + 0.5; // B: 0.5-1.0
            }
            
            particlesGeometry.setAttribute('position', new THREE.BufferAttribute(posArray, 3));
            particlesGeometry.setAttribute('color', new THREE.BufferAttribute(colorArray, 3));
            
            const particlesMaterial = new THREE.PointsMaterial({
                size: 0.15,
                vertexColors: true,
                transparent: true,
                opacity: 0.8,
                sizeAttenuation: true
            });
            
            const particlesMesh = new THREE.Points(particlesGeometry, particlesMaterial);
            scene.add(particlesMesh);
            
            camera.position.z = 8;
            
            // Mouse movement effect
            let mouseX = 0;
            let mouseY = 0;
            
            document.addEventListener('mousemove', (event) => {
                mouseX = (event.clientX / window.innerWidth) * 2 - 1;
                mouseY = -(event.clientY / window.innerHeight) * 2 + 1;
            });
            
            // Animation loop
            function animate() {
                requestAnimationFrame(animate);
                
                // Rotate particles
                particlesMesh.rotation.x += 0.001;
                particlesMesh.rotation.y += 0.002;
                
                // Move camera based on mouse position
                camera.position.x += (mouseX * 3 - camera.position.x) * 0.01;
                camera.position.y += (mouseY * 3 - camera.position.y) * 0.01;
                camera.lookAt(scene.position);
                
                renderer.render(scene, camera);
            }
            
            animate();
            
            // Handle window resize
            window.addEventListener('resize', () => {
                camera.aspect = window.innerWidth / window.innerHeight;
                camera.updateProjectionMatrix();
                renderer.setSize(window.innerWidth, window.innerHeight);
            });
            
            // GSAP animations for scroll effects
            gsap.registerPlugin(ScrollTrigger);
            
            // Animate sections on scroll
            gsap.utils.toArray('.feature-card, .portfolio-item, .service-card, .pricing-card').forEach(element => {
                gsap.from(element, {
                    scrollTrigger: {
                        trigger: element,
                        start: 'top 90%',
                        toggleActions: 'play none none none'
                    },
                    opacity: 0,
                    y: 70,
                    duration: 1.2,
                    ease: 'power3.out'
                });
            });
            
            // Header scroll effect
            const header = document.getElementById('header');
            window.addEventListener('scroll', () => {
                if (window.scrollY > 50) {
                    header.classList.add('scrolled');
                } else {
                    header.classList.remove('scrolled');
                }
                
                // Show/hide scroll to top button
                const scrollTopBtn = document.getElementById('scrollTop');
                if (window.scrollY > 500) {
                    scrollTopBtn.classList.add('visible');
                } else {
                    scrollTopBtn.classList.remove('visible');
                }
            });
            
            // Scroll to top functionality
            document.getElementById('scrollTop').addEventListener('click', () => {
                window.scrollTo({
                    top: 0,
                    behavior: 'smooth'
                });
            });
            
            // Smooth scrolling for anchor links
            document.querySelectorAll('a[href^="#"]').forEach(anchor => {
                anchor.addEventListener('click', function(e) {
                    e.preventDefault();
                    const target = document.querySelector(this.getAttribute('href'));
                    if (target) {
                        window.scrollTo({
                            top: target.offsetTop - 80,
                            behavior: 'smooth'
                        });
                    }
                });
            });
            
            // Portfolio Filter Functionality
            const filterButtons = document.querySelectorAll('.filter-btn');
            const portfolioItems = document.querySelectorAll('.portfolio-item');
            
            filterButtons.forEach(button => {
                button.addEventListener('click', () => {
                    // Remove active class from all buttons
                    filterButtons.forEach(btn => btn.classList.remove('active'));
                    // Add active class to clicked button
                    button.classList.add('active');
                    
                    const filter = button.getAttribute('data-filter');
                    
                    // Filter portfolio items
                    portfolioItems.forEach(item => {
                        if (filter === 'all' || item.getAttribute('data-category') === filter) {
                            item.style.display = 'block';
                            gsap.fromTo(item, {opacity: 0, y: 50}, {opacity: 1, y: 0, duration: 0.8, ease: 'power2.out'});
                        } else {
                            gsap.to(item, {opacity: 0, y: 50, duration: 0.5, ease: 'power2.out', 
                                onComplete: () => {item.style.display = 'none';}
                            });
                        }
                    });
                });
            });
            
            // Enhanced form validation
            const contactForm = document.getElementById('contactForm');
            
            contactForm.addEventListener('submit', function(e) {
                e.preventDefault();
                let isValid = true;
                
                // Reset all error states
                const formGroups = this.querySelectorAll('.form-group');
                formGroups.forEach(group => {
                    group.classList.remove('error', 'success');
                });
                
                // Validate name
                const nameInput = document.getElementById('name');
                if (!nameInput.value.trim()) {
                    nameInput.parentElement.classList.add('error');
                    isValid = false;
                } else {
                    nameInput.parentElement.classList.add('success');
                }
                
                // Validate email
                const emailInput = document.getElementById('email');
                const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
                if (!emailRegex.test(emailInput.value)) {
                    emailInput.parentElement.classList.add('error');
                    isValid = false;
                } else {
                    emailInput.parentElement.classList.add('success');
                }
                
                // Validate message
                const messageInput = document.getElementById('message');
                if (!messageInput.value.trim()) {
                    messageInput.parentElement.classList.add('error');
                    isValid = false;
                } else {
                    messageInput.parentElement.classList.add('success');
                }
                
                if (isValid) {
                    // Form is valid - show success animation
                    gsap.to(contactForm, {
                        opacity: 0,
                        y: -20,
                        duration: 0.5,
                        onComplete: function() {
                            alert('Thank you for your message! We will contact you shortly.');
                            contactForm.reset();
                            gsap.to(contactForm, {opacity: 1, y: 0, duration: 0.5});
                            
                            // Reset success states
                            formGroups.forEach(group => {
                                group.classList.remove('success');
                            });
                        }
                    });
                }
            });
            
            // Button functionality
            document.getElementById('getStartedBtn').addEventListener('click', function() {
                document.querySelector('contact.html').scrollIntoView({ behavior: 'smooth' });
            });
            
            document.getElementById("exploreBtn").addEventListener("click", function() {
                alert("Exploring solutions...");
                window.location.href = "../c1/solutions.html";
            });
            
            document.getElementById("portfolioBtn").addEventListener("click", function() {
                window.location.href = "../portfolio.html";
            });
            
            // Chat bubble functionality
            document.querySelector('.chat-bubble').addEventListener('click', function() {
                alert('Welcome to FelixioTech! How can we assist you today?');
            });
        });