/* 基础重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f8f9fa;
}

/* 导航栏样式 */
nav {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  padding: 15px 5%;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo img {
  height: 40px;
  width: auto;
}

.main-menu {
  display: flex;
  list-style: none;
  gap: 40px;
  align-items: center;
}

.main-menu a {
  text-decoration: none;
  color: #333;
  font-weight: 500;
  transition: color 0.3s ease;
}

.main-menu a:hover {
  color: #4CAF50;
}

.dropdown {
  position: relative;
}

.dropdown-content {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: white;
  border-radius: 8px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
  padding: 30px;
  display: none;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  min-width: 900px;
}

.dropdown:hover .dropdown-content {
  display: grid;
}

.submenu h4 {
  color: #4CAF50;
  margin-bottom: 15px;
  font-size: 1.1em;
}

.submenu ul {
  list-style: none;
}

.submenu li {
  margin-bottom: 8px;
}

.submenu a {
  color: #666;
  font-size: 0.95em;
}

.submenu a:hover {
  color: #4CAF50;
}

.divider {
  width: 1px;
  background: #e0e0e0;
}

.banner-title {
  position: absolute;
  top: 50%;
  left: 10%;
  transform: translateY(-50%);
  color: white;
  font-size: 2.8em;
  font-weight: 700;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
  z-index: 2;
  max-width: 80%;
  line-height: 1.3;
}

/* 页面内容容器 */
.page-content {
  margin-top: 80px;
  padding-bottom: 50px;
}

/* 封面容器 */
.cover-container {
  position: relative;
  width: 100%;
  height: 400px;
  overflow: hidden;
}

.cover-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 新闻内容区域 */
.news-content {
  max-width: 1000px;
  margin: 0 auto;
  padding: 40px 20px;
  background-color: white;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  border-radius: 8px;
  margin-top: -50px;
  position: relative;
  z-index: 3;
}

/* 新闻标题区域 */
.news-header {
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 1px solid #eaeaea;
}

.news-date {
  display: inline-block;
  background-color: #f0f7ff;
  color: #1a73e8;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.9em;
  font-weight: 500;
}

/* 新闻正文 */
.news-body {
  font-size: 1.05em;
  line-height: 1.8;
  color: #333;
}

.news-body p {
  margin-bottom: 20px;
  text-align: justify;
}

.news-body h2 {
  color: #1a237e;
  font-size: 1.8em;
  margin: 40px 0 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid #e3f2fd;
}

.news-body h4 {
  color: #283593;
  font-size: 1.2em;
  margin: 20px 0 10px;
}

/* 问题框样式 */
.problem-box {
  background-color: #f5f7fa;
  border-left: 4px solid #1a73e8;
  padding: 20px 25px;
  margin: 25px 0;
  border-radius: 0 8px 8px 0;
}

.problem-box p {
  font-style: italic;
  margin-bottom: 0;
  color: #555;
}

/* 解决方案步骤 */
.solution-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin: 30px 0;
}

.step-item {
  background-color: #fafafa;
  padding: 25px;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.step-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.step-item h4 {
  color: #3949ab;
  margin-top: 0;
  display: flex;
  align-items: center;
}

.step-item p {
  font-size: 0.95em;
  margin-bottom: 0;
}

/* 行业影响部分 */
.impact-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 25px;
  margin: 30px 0;
}

.impact-item {
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}

.impact-item h4 {
  color: #283593;
  margin-top: 0;
  font-size: 1.3em;
}

.impact-item p {
  margin-bottom: 0;
  color: #444;
}

/* 高亮数据框 */
.highlight-box {
  background-color: #e3f2fd;
  padding: 25px;
  border-radius: 8px;
  margin-top: 40px;
  text-align: center;
  border: 1px solid #bbdefb;
}

.highlight-box p {
  margin-bottom: 0;
  font-size: 1.1em;
  color: #0d47a1;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .banner-title {
    font-size: 2em;
    left: 5%;
    max-width: 90%;
  }
  
  .cover-container {
    height: 300px;
  }
  
  .news-content {
    margin-top: -30px;
    padding: 25px 15px;
  }
  
  .news-body h2 {
    font-size: 1.5em;
  }
  
  .solution-steps, .impact-section {
    grid-template-columns: 1fr;
  }
}