// Theme switcher functionality
document.addEventListener('DOMContentLoaded', () => {
    // Check for saved theme preference or use system preference
    const savedTheme = localStorage.getItem('theme') || 
                      (window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light');
    
    // Apply the saved theme
    document.documentElement.classList.toggle('dark', savedTheme === 'dark');
    
    // Theme toggle button functionality
    const themeToggle = document.getElementById('theme-toggle');
    if (themeToggle) {
        themeToggle.addEventListener('click', () => {
            const isDark = document.documentElement.classList.toggle('dark');
            localStorage.setItem('theme', isDark ? 'dark' : 'light');
            themeToggle.innerHTML = isDark ? 
                '<i data-feather="sun"></i>' : 
                '<i data-feather="moon"></i>';
            feather.replace();
        });
        
        // Set initial icon
        themeToggle.innerHTML = savedTheme === 'dark' ? 
            '<i data-feather="sun"></i>' : 
            '<i data-feather="moon"></i>';
        feather.replace();
    }
    
    // Animate elements on scroll
    const animateOnScroll = () => {
        const elements = document.querySelectorAll('.fade-in, .slide-up');
        elements.forEach(el => {
            const elementPosition = el.getBoundingClientRect().top;
            const windowHeight = window.innerHeight;
            
            if (elementPosition < windowHeight - 100) {
                el.style.opacity = '1';
                el.style.transform = 'translateY(0)';
            }
        });
    };
    
    // Initial check
    animateOnScroll();
    
    // Check on scroll
    window.addEventListener('scroll', animateOnScroll);
});