// 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('opacity-100', 'translate-y-0');
            entry.target.classList.remove('opacity-0', 'translate-y-10');
        }
    });
}, observerOptions);

// Observe all cards and sections
document.addEventListener('DOMContentLoaded', () => {
    const elements = document.querySelectorAll('section > div, .group');
    elements.forEach((el, index) => {
        el.classList.add('transition-all', 'duration-700', 'opacity-0', 'translate-y-10');
        el.style.transitionDelay = `${index * 50}ms`;
        observer.observe(el);
    });
    
    // Form handling with real-time validation
    const form = document.querySelector('form');
    if (form) {
        // Real-time input validation styling
        const inputs = form.querySelectorAll('input, textarea, select');
        inputs.forEach(input => {
            input.addEventListener('focus', () => {
                input.parentElement.classList.add('focused');
            });
            input.addEventListener('blur', () => {
                input.parentElement.classList.remove('focused');
                if (input.value.trim()) {
                    input.classList.add('field-valid');
                    input.classList.remove('field-invalid');
                } else if (input.hasAttribute('required')) {
                    input.classList.add('field-invalid');
                    input.classList.remove('field-valid');
                }
            });
            // Live character feedback
            input.addEventListener('input', () => {
                if (input.tagName === 'TEXTAREA') {
                    const remaining = 500 - input.value.length;
                    let counter = input.parentElement.querySelector('.char-counter');
                    if (!counter) {
                        counter = document.createElement('div');
                        counter.className = 'char-counter text-xs font-mono text-slate-500 text-right mt-1';
                        input.parentElement.appendChild(counter);
                    }
                    counter.textContent = `${remaining} caractères restants`;
                    counter.style.color = remaining < 50 ? '#f59e0b' : remaining < 0 ? '#ef4444' : '#64748b';
                }
            });
        });

        form.addEventListener('submit', (e) => {
            e.preventDefault();
            const btn = form.querySelector('button[type="submit"]');
            const originalText = btn.innerText;
            const originalClasses = btn.className;
            
            btn.innerHTML = '<span class="inline-flex items-center gap-2"><svg class="animate-spin h-4 w-4" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24"><circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle><path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z"></path></svg> ENVOI EN COURS...</span>';
            btn.disabled = true;
            btn.style.opacity = '0.8';
            
            setTimeout(() => {
                btn.innerHTML = '✓ DEMANDE ENVOYÉE';
                btn.className = btn.className.replace('from-primary', 'from-green-500').replace('to-cyan-600', 'to-green-600');
                btn.style.opacity = '1';
                
                // Success feedback on form
                form.style.transition = 'all 0.3s ease';
                form.style.boxShadow = '0 0 30px rgba(34, 197, 94, 0.2)';
                setTimeout(() => { form.style.boxShadow = ''; }, 2000);
                
                setTimeout(() => {
                    form.reset();
                    inputs.forEach(input => {
                        input.classList.remove('field-valid', 'field-invalid');
                    });
                    // Remove char counters
                    form.querySelectorAll('.char-counter').forEach(c => c.remove());
                    btn.textContent = originalText;
                    btn.disabled = false;
                    btn.className = originalClasses;
                }, 3000);
            }, 1500);
        });
    }

    // Smooth scroll for anchor links
    document.querySelectorAll('a[href^="#"]').forEach(anchor => {
        anchor.addEventListener('click', function (e) {
            e.preventDefault();
            const targetId = this.getAttribute('href');
            const target = document.querySelector(targetId);
            if (target) {
                const navHeight = 80;
                const targetPosition = target.getBoundingClientRect().top + window.pageYOffset - navHeight;
                window.scrollTo({
                    top: targetPosition,
                    behavior: 'smooth'
                });
            }
        });
    });

    // Parallax effect on hero section
    const heroSection = document.querySelector('section');
    if (heroSection) {
        window.addEventListener('scroll', () => {
            const scrolled = window.pageYOffset;
            const bgElements = heroSection.querySelectorAll('.absolute');
            bgElements.forEach((el, i) => {
                const speed = 0.1 + (i * 0.05);
                el.style.transform = `translateY(${scrolled * speed}px)`;
            });
        }, { passive: true });
    }
});