// Shared functions and utilities

// Debounce function for resize events
function debounce(func, wait = 100) {
    let timeout;
    return function(...args) {
        clearTimeout(timeout);
        timeout = setTimeout(() => {
            func.apply(this, args);
        }, wait);
    };
}

// Check if element is in viewport
function isInViewport(element) {
    const rect = element.getBoundingClientRect();
    return (
        rect.top >= 0 &&
        rect.left >= 0 &&
        rect.bottom <= (window.innerHeight || document.documentElement.clientHeight) &&
        rect.right <= (window.innerWidth || document.documentElement.clientWidth)
    );
}

// Add smooth scrolling to all links
document.addEventListener('DOMContentLoaded', () => {
    document.querySelectorAll('a[href^="#"]').forEach(anchor => {
        anchor.addEventListener('click', function(e) {
            e.preventDefault();
            document.querySelector(this.getAttribute('href')).scrollIntoView({
                behavior: 'smooth'
            });
        });
    });
});

// Handle back to top button
window.addEventListener('scroll', debounce(() => {
    const backToTop = document.getElementById('back-to-top');
    if (backToTop) {
        if (window.pageYOffset > 300) {
            backToTop.classList.remove('opacity-0', 'invisible');
            backToTop.classList.add('opacity-100', 'visible');
        } else {
            backToTop.classList.remove('opacity-100', 'visible');
            backToTop.classList.add('opacity-0', 'invisible');
        }
    }
}));