document.addEventListener('DOMContentLoaded', function() {
        const buttons = document.querySelectorAll('.button-container button');
        const sections = document.querySelectorAll('section');
        
        // Initially hide all sections
        sections.forEach(section => {
            section.classList.remove('active');
        });
        
        // Add click event to each button
        buttons.forEach(button => {
            button.addEventListener('click', function() {
                const sectionId = this.getAttribute('data-section');
                
                // Hide all sections
                sections.forEach(section => {
                    section.classList.remove('active');
                });
                
                // Show the corresponding section
                document.getElementById(sectionId).classList.add('active');
                
                // Update button states
                buttons.forEach(btn => {
                    btn.classList.remove('active');
                });
                this.classList.add('active');
            });
        });
        
        // Optional: Activate first button by default
        // buttons[0].click();
    });