// 页面加载完成后执行
document.addEventListener('DOMContentLoaded', function() {
    // 移动端菜单切换
    const mobileMenuButton = document.getElementById('mobile-menu-button');
    const mobileMenu = document.getElementById('mobile-menu');
    
    if (mobileMenuButton && mobileMenu) {
        mobileMenuButton.addEventListener('click', function() {
            mobileMenu.classList.toggle('hidden');
            
            // 切换菜单图标
            const icon = mobileMenuButton.querySelector('i');
            if (mobileMenu.classList.contains('hidden')) {
                icon.classList.remove('fa-times');
                icon.classList.add('fa-bars');
            } else {
                icon.classList.remove('fa-bars');
                icon.classList.add('fa-times');
            }
        });
    }
    
    // 平滑滚动到锚点
    const navLinks = document.querySelectorAll('a[href^="#"]');
    navLinks.forEach(link => {
        link.addEventListener('click', function(e) {
            const targetId = this.getAttribute('href');
            if (targetId === '#') return;
            
            // 只处理页面内锚点链接
            if (targetId.startsWith('#')) {
                e.preventDefault();
                
                const targetElement = document.querySelector(targetId);
                if (targetElement) {
                    // 如果是移动端菜单，点击后关闭菜单
                    if (mobileMenu && !mobileMenu.classList.contains('hidden')) {
                        mobileMenu.classList.add('hidden');
                        const icon = mobileMenuButton.querySelector('i');
                        icon.classList.remove('fa-times');
                        icon.classList.add('fa-bars');
                    }
                    
                    window.scrollTo({
                        top: targetElement.offsetTop - 80,
                        behavior: 'smooth'
                    });
                }
            }
        });
    });
    
    // 返回顶部按钮
    const backToTopButton = document.getElementById('back-to-top');
    
    // 监听滚动事件，显示/隐藏返回顶部按钮
    window.addEventListener('scroll', function() {
        if (backToTopButton) {
            if (window.scrollY > 300) {
                backToTopButton.classList.remove('hidden');
            } else {
                backToTopButton.classList.add('hidden');
            }
        }
    });
    
    // 返回顶部按钮点击事件
    if (backToTopButton) {
        backToTopButton.addEventListener('click', function() {
            window.scrollTo({
                top: 0,
                behavior: 'smooth'
            });
        });
    }
    
    // 联系表单提交
    const contactForm = document.getElementById('contact-form');
    if (contactForm) {
        contactForm.addEventListener('submit', function(e) {
            e.preventDefault();
            
            // 获取表单数据
            const name = document.getElementById('name').value;
            const email = document.getElementById('email').value;
            const subject = document.getElementById('subject').value;
            const message = document.getElementById('message').value;
            
            // 简单验证
            if (!name || !email || !subject || !message) {
                alert('请填写所有必填字段');
                return;
            }
            
            // 这里通常应该发送数据到服务器
            // 现在我们先模拟成功提交
            alert(`感谢您，${name}！您的消息已成功发送。我们会尽快通过 ${email} 与您联系。`);
            
            // 重置表单
            contactForm.reset();
        });
    }
    
    // 功能卡片动画效果
    const featureCards = document.querySelectorAll('.feature-card');
    
    featureCards.forEach(card => {
        card.addEventListener('mouseenter', function() {
            this.style.transition = 'transform 0.3s ease, box-shadow 0.3s ease';
            this.style.boxShadow = '0 20px 40px rgba(0, 0, 0, 0.1)';
        });
        
        card.addEventListener('mouseleave', function() {
            this.style.boxShadow = '';
        });
    });
    
    // 动态更新年份
    const yearElement = document.querySelector('footer p');
    if (yearElement && yearElement.textContent.includes('2023')) {
        const currentYear = new Date().getFullYear();
        yearElement.textContent = yearElement.textContent.replace('2023', currentYear);
    }
    
    // 初始化页面加载动画
    setTimeout(() => {
        document.body.classList.add('loaded');
    }, 100);
});

// 添加一些额外的交互效果
window.addEventListener('load', function() {
    // 为导航栏添加滚动效果
    const nav = document.querySelector('nav');
    
    window.addEventListener('scroll', function() {
        if (window.scrollY > 50) {
            nav.classList.add('shadow-lg');
            nav.classList.remove('nav-shadow');
        } else {
            nav.classList.remove('shadow-lg');
            nav.classList.add('nav-shadow');
        }
    });
});