document.addEventListener('DOMContentLoaded', () => {
    // Navbar Scroll Effect
    const navbar = document.querySelector('.navbar');
    window.addEventListener('scroll', () => {
        if (window.scrollY > 50) {
            navbar.classList.add('scrolled');
        } else {
            navbar.classList.remove('scrolled');
        }
    });

    // Mobile Menu Toggle
    const mobileMenuToggle = document.querySelector('.mobile-menu-toggle');
    const navLinks = document.querySelector('.nav-links');
    
    if (mobileMenuToggle) {
        mobileMenuToggle.addEventListener('click', () => {
            navLinks.classList.toggle('active');
            const icon = mobileMenuToggle.querySelector('i');
            if (navLinks.classList.contains('active')) {
                icon.classList.replace('fa-bars', 'fa-times');
            } else {
                icon.classList.replace('fa-times', 'fa-bars');
            }
        });
    }

    // Hero Swiper
    const heroSwiper = new Swiper('.hero-swiper', {
        loop: true,
        effect: 'fade',
        fadeEffect: {
            crossFade: true
        },
        autoplay: {
            delay: 6000,
            disableOnInteraction: false,
        },
        pagination: {
            el: '.swiper-pagination',
            clickable: true,
        },
        navigation: {
            nextEl: '.swiper-button-next',
            prevEl: '.swiper-button-prev',
        },
    });

    // Testimonials Swiper
    const testimonialsSwiper = new Swiper('.testimonials-swiper', {
        slidesPerView: 1,
        spaceBetween: 30,
        loop: true,
        autoplay: {
            delay: 5000,
            disableOnInteraction: false,
        },
        pagination: {
            el: '.swiper-pagination',
            clickable: true,
        },
        breakpoints: {
            768: {
                slidesPerView: 2,
            },
            1024: {
                slidesPerView: 3,
            },
        },
    });

    // Portfolio Filtering
    const filterBtns = document.querySelectorAll('.filter-btn');
    const portfolioItems = document.querySelectorAll('.portfolio-item');

    filterBtns.forEach(btn => {
        btn.addEventListener('click', () => {
            // Update active button
            filterBtns.forEach(b => b.classList.remove('active'));
            btn.classList.add('active');

            const filterValue = btn.getAttribute('data-filter');

            portfolioItems.forEach(item => {
                if (filterValue === 'all' || item.classList.contains(filterValue)) {
                    item.style.display = 'block';
                    item.style.animation = 'fadeIn 0.5s ease forwards';
                } else {
                    item.style.display = 'none';
                }
            });
        });
    });

    // Contact Form Submission
    const contactForm = document.getElementById('contactForm');
    const toast = document.getElementById('toast');

    if (contactForm) {
        contactForm.addEventListener('submit', async (e) => {
            e.preventDefault();
            
            const formData = new FormData(contactForm);
            const submitBtn = contactForm.querySelector('button[type="submit"]');
            const originalBtnText = submitBtn.innerHTML;
            
            submitBtn.disabled = true;
            submitBtn.innerHTML = '<i class="fas fa-spinner fa-spin"></i> 发送中...';

            try {
                const response = await fetch('contact.php', {
                    method: 'POST',
                    body: formData
                });

                const result = await response.json();

                if (result.success) {
                    showToast('消息已成功发送！我会尽快给您回复。');
                    contactForm.reset();
                } else {
                    showToast('发送失败: ' + (result.error || '请稍后再试'));
                }
            } catch (error) {
                showToast('无法连接到服务器，请检查网络。');
            } finally {
                submitBtn.disabled = false;
                submitBtn.innerHTML = originalBtnText;
            }
        });
    }

    function showToast(message) {
        toast.innerText = message;
        toast.style.display = 'block';
        toast.style.animation = 'slideInUp 0.5s ease forwards';
        
        setTimeout(() => {
            toast.style.animation = 'slideOutDown 0.5s ease forwards';
            setTimeout(() => {
                toast.style.display = 'none';
            }, 500);
        }, 5000);
    }

    // Smooth scroll for nav links
    document.querySelectorAll('a[href^="#"]').forEach(anchor => {
        anchor.addEventListener('click', function (e) {
            e.preventDefault();
            
            // Close mobile menu if open
            if (navLinks.classList.contains('active')) {
                navLinks.classList.remove('active');
                const icon = mobileMenuToggle.querySelector('i');
                icon.classList.replace('fa-times', 'fa-bars');
            }

            const target = document.querySelector(this.getAttribute('href'));
            if (target) {
                const offset = 80;
                const bodyRect = document.body.getBoundingClientRect().top;
                const elementRect = target.getBoundingClientRect().top;
                const elementPosition = elementRect - bodyRect;
                const offsetPosition = elementPosition - offset;

                window.scrollTo({
                    top: offsetPosition,
                    behavior: 'smooth'
                });
            }
        });
    });
});

// Animation styles
const style = document.createElement('style');
style.textContent = `
    @keyframes fadeIn {
        from { opacity: 0; transform: translateY(20px); }
        to { opacity: 1; transform: translateY(0); }
    }
    @keyframes slideInUp {
        from { transform: translateY(100%); opacity: 0; }
        to { transform: translateY(0); opacity: 1; }
    }
    @keyframes slideOutDown {
        from { transform: translateY(0); opacity: 1; }
        to { transform: translateY(100%); opacity: 0; }
    }
`;
document.head.appendChild(style);