// 导航栏滚动效果
document.addEventListener('DOMContentLoaded', function() {
  const navbar = document.querySelector('.navbar');
  
  window.addEventListener('scroll', function() {
    if (window.scrollY > 50) {
      navbar.classList.add('scrolled');
    } else {
      navbar.classList.remove('scrolled');
    }
  });
  
  // 平滑滚动
  document.querySelectorAll('a[href^="#"]').forEach(anchor => {
    anchor.addEventListener('click', function(e) {
      e.preventDefault();
      
      const targetId = this.getAttribute('href');
      const targetElement = document.querySelector(targetId);
      
      if (targetElement) {
        window.scrollTo({
          top: targetElement.offsetTop - 70,
          behavior: 'smooth'
        });
      }
    });
  });
  
  // 新闻轮播
  const newsContainer = document.querySelector('#news .row');
  const newsItems = document.querySelectorAll('#news .col-md-4');
  
  if (newsItems.length > 0) {
    // 创建轮播指示器
    const indicatorsContainer = document.createElement('div');
    indicatorsContainer.className = 'carousel-indicators d-flex justify-content-center mt-3';
    
    // 为每个新闻项创建指示器
    newsItems.forEach((item, index) => {
      const indicator = document.createElement('button');
      indicator.type = 'button';
      indicator.className = index === 0 ? 'active' : '';
      indicator.setAttribute('data-bs-target', '#news');
      indicator.setAttribute('data-bs-slide-to', index.toString());
      
      indicator.addEventListener('click', () => {
        showNews(index);
      });
      
      indicatorsContainer.appendChild(indicator);
    });
    
    // 将指示器添加到新闻区域
    newsContainer.parentNode.insertBefore(indicatorsContainer, newsContainer.nextSibling);
    
    let currentIndex = 0;
    
    function showNews(index) {
      // 隐藏所有新闻项
      newsItems.forEach(item => {
        item.classList.remove('d-block');
        item.classList.add('d-none');
      });
      
      // 显示指定新闻项
      newsItems[index].classList.remove('d-none');
      newsItems[index].classList.add('d-block');
      
      // 更新指示器
      const indicators = indicatorsContainer.querySelectorAll('button');
      indicators.forEach((indicator, i) => {
        if (i === index) {
          indicator.classList.add('active');
        } else {
          indicator.classList.remove('active');
        }
      });
      
      currentIndex = index;
    }
    
    // 初始化第一个新闻项
    showNews(0);
    
    // 每5秒自动轮播
    setInterval(() => {
      const nextIndex = (currentIndex + 1) % newsItems.length;
      showNews(nextIndex);
    }, 5000);
  }
});