document.addEventListener('DOMContentLoaded', function () {
    const sections = document.querySelectorAll('.section');
    const navLinks = document.querySelectorAll('.nav-link');
    const menuToggle = document.querySelector('.menu-toggle');
    const navMenu = document.querySelector('.nav-menu');
    const sectionContainer = document.querySelector('.section-container');

    // 汉堡菜单点击事件
    menuToggle.addEventListener('click', function () {
        this.classList.toggle('active');
        navMenu.classList.toggle('active');
    });

    // 导航链接点击事件
    navLinks.forEach(link => {
        link.addEventListener('click', function (e) {
            e.preventDefault();
            const targetId = this.getAttribute('href');
            const targetSection = document.querySelector(targetId);

            // 关闭移动端菜单
            menuToggle.classList.remove('active');
            navMenu.classList.remove('active');

            // 滚动到对应模块
            targetSection.scrollIntoView({
                behavior: 'smooth'
            });
        });
    });

    // 模块化滚动检测
    sectionContainer.addEventListener('scroll', function () {
        const currentScroll = this.scrollTop;
        const windowHeight = window.innerHeight;

        sections.forEach((section, index) => {
            const sectionTop = index * windowHeight;
            const sectionBottom = (index + 1) * windowHeight;

            if (currentScroll >= sectionTop && currentScroll < sectionBottom) {
                const currentId = section.getAttribute('id');

                navLinks.forEach(link => {
                    link.classList.remove('active');
                    if (link.getAttribute('href') === `#${currentId}`) {
                        link.classList.add('active');
                    }
                });
            }
        });
    });

    // 阻止默认滚动行为
    window.addEventListener('wheel', function (e) {
        if (e.cancelable) {
            e.preventDefault();
        }

        const delta = Math.sign(e.deltaY);
        const currentIndex = Math.round(sectionContainer.scrollTop / window.innerHeight);
        const maxIndex = sections.length - 1;

        let targetIndex = currentIndex + delta;
        targetIndex = Math.max(0, Math.min(targetIndex, maxIndex));

        sectionContainer.scrollTo({
            top: targetIndex * window.innerHeight,
            behavior: 'smooth'
        });
    }, { passive: false });

    // 触摸设备支持
    let startY;
    sectionContainer.addEventListener('touchstart', function (e) {
        startY = e.touches[0].clientY;
    }, { passive: true });

    sectionContainer.addEventListener('touchmove', function (e) {
        if (e.cancelable) {
            e.preventDefault();
        }

        const currentY = e.touches[0].clientY;
        const deltaY = startY - currentY;

        if (Math.abs(deltaY) > 50) { // 滑动阈值
            const direction = deltaY > 0 ? 1 : -1;
            const currentIndex = Math.round(sectionContainer.scrollTop / window.innerHeight);
            const maxIndex = sections.length - 1;

            let targetIndex = currentIndex + direction;
            targetIndex = Math.max(0, Math.min(targetIndex, maxIndex));

            sectionContainer.scrollTo({
                top: targetIndex * window.innerHeight,
                behavior: 'smooth'
            });

            startY = currentY;
        }
    }, { passive: false });

    // 初始化高亮
    sectionContainer.dispatchEvent(new Event('scroll'));
});