// Intersection Observer for Fade-in Animations
const observerOptions = {
    root: null,
    rootMargin: '0px',
    threshold: 0.1
};

const observer = new IntersectionObserver((entries) => {
    entries.forEach(entry => {
        if (entry.isIntersecting) {
            entry.target.classList.add('animate-fade-in');
            observer.unobserve(entry.target);
        }
    });
}, observerOptions);

// Observe all cards and sections
document.addEventListener('DOMContentLoaded', () => {
    const animateElements = document.querySelectorAll('.group, section > div');
    animateElements.forEach((el, index) => {
        el.style.opacity = '0';
        el.style.transform = 'translateY(20px)';
        el.style.transition = `opacity 0.6s ease ${index * 0.1}s, transform 0.6s ease ${index * 0.1}s`;
        observer.observe(el);
    });
});

// Custom Animation Classes
const style = document.createElement('style');
style.textContent = `
    .animate-fade-in {
        opacity: 1 !important;
        transform: translateY(0) !important;
    }
    
    @keyframes float {
        0%, 100% { transform: translateY(0px); }
        50% { transform: translateY(-20px); }
    }
    
    .animate-float-slow {
        animation: float 6s ease-in-out infinite;
    }
    
    .animate-float-medium {
        animation: float 4s ease-in-out infinite;
    }
`;
document.head.appendChild(style);

// Tool Cards Interaction
document.querySelectorAll('.tool-card').forEach(card => {
    card.addEventListener('mouseenter', function() {
        this.style.transform = 'translateY(-8px) scale(1.02)';
    });
    
    card.addEventListener('mouseleave', function() {
        this.style.transform = 'translateY(0) scale(1)';
    });
});

// Smooth Scroll 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) {
            target.scrollIntoView({
                behavior: 'smooth',
                block: 'start'
            });
        }
    });
});

// Mobile Menu Toggle Functionality (handled in web component, but backup here)
function toggleMobileMenu() {
    const mobileMenu = document.querySelector('[data-mobile-menu]');
    if (mobileMenu) {
        mobileMenu.classList.toggle('hidden');
        mobileMenu.classList.toggle('flex');
    }
}

// Parallax Effect for Hero Section
window.addEventListener('scroll', () => {
    const scrolled = window.pageYOffset;
    const parallaxElements = document.querySelectorAll('.parallax');
    
    parallaxElements.forEach(el => {
        const speed = el.dataset.speed || 0.5;
        el.style.transform = `translateY(${scrolled * speed}px)`;
    });
});

// Dynamic Year Update
const yearElements = document.querySelectorAll('.current-year');
yearElements.forEach(el => {
    el.textContent = new Date().getFullYear();
});

// Form Validation
function validateEmail(email) {
    const re = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    return re.test(email);
}

// Newsletter Form Handler
const newsletterForms = document.querySelectorAll('form');
newsletterForms.forEach(form => {
    form.addEventListener('submit', (e) => {
        const emailInput = form.querySelector('input[type="email"]');
        if (emailInput && !validateEmail(emailInput.value)) {
            e.preventDefault();
            emailInput.classList.add('border-red-500');
            setTimeout(() => {
                emailInput.classList.remove('border-red-500');
            }, 3000);
        }
    });
});

// Toast Notification System
function showToast(message, type = 'success') {
    const toast = document.createElement('div');
    toast.className = `fixed bottom-4 right-4 px-6 py-4 rounded-xl text-white font-medium z-50 transform translate-y-20 transition-transform duration-300 ${
        type === 'success' ? 'bg-green-600' : 'bg-red-600'
    }`;
    toast.textContent = message;
    document.body.appendChild(toast);
    
    setTimeout(() => {
        toast.style.transform = 'translateY(0)';
    }, 100);
    
    setTimeout(() => {
        toast.style.transform = 'translateY(20px)';
        setTimeout(() => toast.remove(), 300);
    }, 3000);
}

// Button Click Handlers for "Free" emphasis
document.querySelectorAll('button, a').forEach(btn => {
    if (btn.textContent.includes('Try now') || btn.textContent.includes('Create')) {
        btn.addEventListener('click', (e) => {
            if (!btn.getAttribute('href') || btn.getAttribute('href') === '#') {
                e.preventDefault();
                showToast('Opening free tool... No credit card required!');
            }
        });
    }
});

// Performance: Lazy load images
if ('IntersectionObserver' in window) {
    const imageObserver = new IntersectionObserver((entries, observer) => {
        entries.forEach(entry => {
            if (entry.isIntersecting) {
                const img = entry.target;
                img.src = img.dataset.src || img.src;
                img.classList.remove('lazy');
                imageObserver.unobserve(img);
            }
        });
    });

    document.querySelectorAll('img').forEach(img => imageObserver.observe(img));
}

// Keyboard Navigation Enhancement
document.addEventListener('keydown', (e) => {
    if (e.key === 'Tab') {
        document.body.classList.add('keyboard-navigation');
    }
});

document.addEventListener('mousedown', () => {
    document.body.classList.remove('keyboard-navigation');
});