/* 全局样式重置和基础设置 */
:root {
  --primary-color: #0d6efd;
  --primary-dark: #0a58ca;
  --secondary-color: #6c757d;
  --text-dark: #212529;
  --text-light: #6c757d;
  --bg-light: #f8f9fa;
  --bg-gray: #f1f3f5;
  --white: #ffffff;
  --border-radius: 0.5rem;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

/* 页面头部样式 */
.page-header {
  padding: 120px 0 60px;
  background: linear-gradient(135deg, #0a1929 0%, #142d4c 100%);
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('../../img/news/trend-chart.jpg') center/cover no-repeat;
  opacity: 0.2;
  z-index: 0;
}

.page-header .container {
  position: relative;
  z-index: 1;
}

.page-header h1 {
  color: var(--white);
  font-size: 2.75rem;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.5px;
}

.page-header p {
  font-size: 1.25rem;
  line-height: 1.6;
  max-width: 3xl;
  margin: 0 auto;
  opacity: 0.9;
}

/* 新闻主区域样式 */
.news-section {
  padding-top: 3rem;
  padding-bottom: 3rem;
}

/* 置顶文章样式 */
.featured-news {
  margin-bottom: 2.5rem;
}

.featured-news .bg-white {
  border-radius: 1rem;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
}

/* 置顶文章图片容器样式 */
.featured-news .news-image {
  overflow: hidden;
  width: 100%;
  height: 100%;
  position: relative;
}

/* 确保置顶文章图片占满整个容器 */
.featured-news .news-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: var(--transition);
}

.featured-news:hover .news-image img {
  transform: scale(1.05);
}

.featured-news .bg-white:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 25px rgba(0, 0, 0, 0.1);
}

.featured-news .p-8 {
  padding: 2.5rem;
}

.featured-news .news-meta {
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.featured-news .category {
  background-color: var(--primary-color);
  color: var(--white);
  padding: 0.375rem 0.875rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.featured-news .date {
  color: var(--text-light);
  font-size: 0.875rem;
}

.featured-news h2 {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 1rem;
}

.featured-news h2 a {
  color: var(--text-dark);
  transition: var(--transition);
  text-decoration: none;
}

.featured-news h2 a:hover {
  color: var(--primary-color);
}

.featured-news p {
  color: var(--text-light);
  font-size: 1.125rem;
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.featured-news .news-tags {
  margin-bottom: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.featured-news .tag {
  background-color: var(--bg-gray);
  color: var(--text-dark);
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  transition: var(--transition);
  text-decoration: none;
}

.featured-news .tag:hover {
  background-color: var(--primary-color);
  color: var(--white);
}

.featured-news .btn-primary {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 0.5rem;
  transition: var(--transition);
  text-decoration: none;
  display: inline-block;
}

.featured-news .btn-primary:hover {
  background-color: var(--primary-dark);
  border-color: var(--primary-dark);
  transform: translateY(-2px);
}

/* 最新文章区域样式 */
.latest-news {
  margin-bottom: 2.5rem;
}

.latest-news-header {
  margin-bottom: 2.5rem;
}

.latest-news-header h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-dark);
  padding-left: 1rem;
  border-left: 4px solid var(--primary-color);
  display: inline-block;
}

/* 新闻卡片样式 */
.news-card {
  background-color: var(--white);
  border-radius: 1rem;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.news-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-5px);
}

.news-card .news-image {
  overflow: hidden;
  width: 100%;
  height: 240px;
  position: relative;
}

.news-card .news-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: var(--transition);
}

.news-card:hover .news-image img {
  transform: scale(1.05);
}

.news-card .p-6 {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.news-card .news-meta {
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.news-card .category {
  font-size: 0.75rem;
  padding: 0.25rem 0.625rem;
  font-weight: 500;
}

.news-card h3 {
  font-size: 1.375rem;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 0.75rem;
  flex: 1;
}

.news-card h3 a {
  color: var(--text-dark);
  text-decoration: none;
  transition: var(--transition);
}

.news-card h3 a:hover {
  color: var(--primary-color);
}

.news-card p {
  color: var(--text-light);
  font-size: 0.9375rem;
  line-height: 1.5;
  margin-bottom: 1rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-card .news-tags {
  margin-bottom: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.news-card .tag {
  font-size: 0.75rem;
  padding: 0.25rem 0.75rem;
}

.news-card a.text-primary {
  color: var(--primary-color);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.news-card a.text-primary:hover {
  color: var(--primary-dark);
}

.news-card a.text-primary i {
  transition: var(--transition);
}

.news-card a.text-primary:hover i {
  transform: translateX(3px);
}

/* 查看更多按钮样式 */
.btn-outline-primary {
  border-color: var(--primary-color);
  color: var(--primary-color);
  padding: 0.75rem 2.5rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 0.5rem;
  transition: var(--transition);
  text-decoration: none;
  display: inline-block;
}

.btn-outline-primary:hover {
  background-color: var(--primary-color);
  color: var(--white);
  transform: translateY(-2px);
}

/* 热门标签区域样式 */
.tags-section {
  padding: 1.5rem 0;
  background-color: var(--bg-light);
}

.tags-section-header {
  margin-bottom: 1.5rem;
}

.tags-section-header h3 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-dark);
  margin: 0;
}

.tags-container {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 -0.25rem;
}

.tags-container .tag {
  background-color: var(--white);
  color: var(--text-dark);
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
  margin: 0 0.25rem 0.5rem 0.25rem;
}

.tags-container .tag:hover {
  background-color: var(--primary-color);
  color: var(--white);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

/* 推荐阅读区域样式 */
.recommended-section {
  padding: 3rem 0;
}

.recommended-header {
  margin-bottom: 1.5rem;
}

.recommended-header h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-dark);
  padding-left: 1rem;
  border-left: 4px solid var(--primary-color);
  display: inline-block;
}

/* 推荐文章卡片样式 */
.recommended-article {
  background-color: var(--white);
  border-radius: 1rem;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  height: 100%;
}

/* 为推荐文章列容器增加更大的底边距 */
.recommended-section .col-md-6 {
  margin-bottom: 1rem;
}

.recommended-article:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.recommended-article {
  display: flex;
  align-items: stretch;
  height: 100%;
}

.recommended-article .col-4 {
  padding: 0;
  overflow: hidden;
  min-height: 120px;
  height: 100%;
  display: flex;
  align-items: stretch;
}

.recommended-article img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: var(--transition);
}

.recommended-article:hover img {
  transform: scale(1.05);
}

.recommended-article .col-8 {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
}

.recommended-article h3 {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 0.5rem;
  flex: 1;
}

.recommended-article h3 a {
  color: var(--text-dark);
  text-decoration: none;
  transition: var(--transition);
}

.recommended-article h3 a:hover {
  color: var(--primary-color);
}

.recommended-article p {
  color: var(--text-light);
  font-size: 0.875rem;
  line-height: 1.5;
  margin-bottom: 0.5rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.recommended-article .date {
  color: var(--text-light);
  font-size: 0.75rem;
}

/* 返回顶部按钮样式 */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background-color: var(--primary-color);
  color: var(--white);
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  opacity: 0;
  visibility: hidden;
  z-index: 100;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background-color: var(--primary-dark);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

/* 响应式设计 */
@media (max-width: 991px) {
  .page-header {
    padding: 100px 0 50px;
  }
  
  .page-header h1 {
    font-size: 2.25rem;
  }
  
  .featured-news .p-8 {
    padding: 2rem;
  }
  
  .featured-news h2 {
    font-size: 1.75rem;
  }
}

@media (max-width: 767px) {
  .page-header h1 {
    font-size: 2rem;
  }
  
  .page-header p {
    font-size: 1rem;
  }
  
  .news-section {
    padding-top: 4rem;
    padding-bottom: 4rem;
  }
  
  .featured-news {
    margin-bottom: 3rem;
  }
  
  .tags-section {
    padding: 3rem 0;
  }
  
  .recommended-section {
    padding: 4rem 0;
  }
  
  .recommended-article .col-8 {
    padding: 1rem;
  }
  
  .news-card {
    margin-bottom: 2rem;
  }
  
  .news-card .news-image {
    height: 200px;
  }
}

@media (max-width: 575px) {
  .page-header {
    padding: 80px 0 40px;
  }
  
  .page-header h1 {
    font-size: 2rem;
  }
  
  .page-header p {
    font-size: 1.125rem;
  }
  
  .featured-news .p-8 {
    padding: 1.5rem;
  }
  
  .featured-news h2 {
    font-size: 1.5rem;
  }
  
  .tags-container .tag {
    /* padding: 0.625rem 1rem; */
    padding:0;
    font-size: 0.875rem;
  }
  
  .news-card {
    margin-bottom: 1.5rem;
  }
  
  .news-card .news-image {
    height: 180px;
  }
}