:root {
  --primary-blue: #0A2463;
  --accent-green: #00B894;
  --light-blue: #E8F1FF;
  --light-gray: #F8F9FA;
  --medium-gray: #E9ECEF;
  --dark-gray: #6C757D;
  --darker-gray: #343A40;
  --white: #FFF;
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  --border-radius: 8px;
  --transition: all 0.3s ease;
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: "Noto Sans SC", sans-serif;
  line-height: 1.6;
  color: var(--darker-gray);
  background-color: var(--white);
}
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}
/* 头部导航样式 */
header {
  background-color: var(--white);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  position: sticky;
  top: 0;
  z-index: 1000;
}
.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 0;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary-blue), var(--accent-green));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 700;
}
.logo-text h1 {
  color: var(--primary-blue);
  font-size: 24px;
  font-weight: 700;
}
.logo-text p {
  color: var(--dark-gray);
  font-size: 12px;
  margin-top: -5px;
}
.nav-links {
  display: flex;
  gap: 30px;
}
.nav-links a {
  text-decoration: none;
  color: var(--darker-gray);
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}
.nav-links a:hover {
  color: var(--primary-blue);
}
.nav-links a.active {
  color: var(--primary-blue);
}
.nav-links a.active::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--primary-blue);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 15px;
}
.btn-login {
  background: none;
  border: 1px solid var(--medium-gray);
  padding: 8px 20px;
  border-radius: var(--border-radius);
  color: var(--darker-gray);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}
.btn-login:hover {
  background-color: var(--light-gray);
}
.btn-register {
  background-color: var(--primary-blue);
  border: none;
  padding: 8px 20px;
  border-radius: var(--border-radius);
  color: var(--white);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}
.btn-register:hover {
  background-color: #082048;
}
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  color: var(--primary-blue);
  cursor: pointer;
}
/* 面包屑导航 */
.breadcrumb {
  padding: 20px 0;
  background-color: var(--light-gray);
}
.breadcrumb-content {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
}
.breadcrumb a {
  text-decoration: none;
  color: var(--dark-gray);
}
.breadcrumb a:hover {
  color: var(--primary-blue);
}
.breadcrumb .current {
  color: var(--primary-blue);
  font-weight: 500;
}
/* 页面标题 */
.page-header {
  padding: 40px 0 20px;
}
.page-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--primary-blue);
  margin-bottom: 10px;
}
.page-subtitle {
  color: var(--dark-gray);
  font-size: 18px;
  margin-bottom: 30px;
}
/* 金融知识页面主布局 */
.knowledge-page {
  display: flex;
  gap: 30px;
  padding: 30px 0 80px;
}
/* 侧边栏 */
.sidebar {
  width: 280px;
  flex-shrink: 0;
}
.sidebar-card {
  background-color: var(--white);
  border-radius: var(--border-radius);
  padding: 25px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}
.sidebar-card h3 {
  font-size: 18px;
  color: var(--primary-blue);
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--medium-gray);
}
/* 分类导航 */
.category-nav {
  background-color: var(--white);
  border-radius: var(--border-radius);
  padding: 25px;
  box-shadow: var(--shadow);
}
.category-nav h3 {
  font-size: 18px;
  color: var(--primary-blue);
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--medium-gray);
}
.category-list {
  list-style: none;
}
.category-item {
  margin-bottom: 15px;
}
.category-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-decoration: none;
  color: var(--darker-gray);
  padding: 10px 15px;
  border-radius: var(--border-radius);
  transition: var(--transition);
}
.category-link:hover {
  background-color: var(--light-gray);
  color: var(--primary-blue);
}
.category-link.active {
  background-color: var(--light-blue);
  color: var(--primary-blue);
  font-weight: 500;
}
.category-count {
  background-color: var(--light-blue);
  color: var(--primary-blue);
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
}
/* 热门文章 */
.popular-articles {
  background-color: var(--white);
  border-radius: var(--border-radius);
  padding: 25px;
  box-shadow: var(--shadow);
}
.popular-article {
  display: flex;
  gap: 15px;
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--medium-gray);
}
.popular-article:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}
.popular-article-rank {
  width: 24px;
  height: 24px;
  background-color: var(--light-blue);
  color: var(--primary-blue);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 12px;
  flex-shrink: 0;
}
.popular-article-rank.top {
  background-color: var(--accent-green);
  color: var(--white);
}
.popular-article-content {
  flex: 1;
}
.popular-article-title {
  font-weight: 600;
  color: var(--primary-blue);
  margin-bottom: 5px;
  text-decoration: none;
  display: block;
  font-size: 15px;
}
.popular-article-title:hover {
  text-decoration: underline;
}
.popular-article-meta {
  font-size: 12px;
  color: var(--dark-gray);
}
/* 搜索框 */
.search-box {
  margin-bottom: 20px;
}
.search-input-group {
  position: relative;
}
.search-input {
  width: 100%;
  padding: 12px 15px 12px 45px;
  border: 1px solid var(--medium-gray);
  border-radius: var(--border-radius);
  font-family: "Noto Sans SC", sans-serif;
  font-size: 16px;
  background-color: var(--white);
}
.search-input:focus {
  outline: none;
  border-color: var(--accent-green);
}
.search-icon {
  position: absolute;
  left: 15px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--dark-gray);
}
/* 主要内容区域 */
.main-content {
  flex: 1;
}
/* 文章列表 */
.articles-container {
  background-color: var(--white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  padding: 40px;
  margin-bottom: 40px;
}
.section-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--primary-blue);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.section-description {
  color: var(--dark-gray);
  margin-bottom: 30px;
  font-size: 16px;
}
.articles-list {
  display: flex;
  flex-direction: column;
  gap: 30px;
}
/* 文章卡片样式 */
.article-card {
  background-color: var(--white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: var(--transition);
}
.article-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}
.article-card.featured {
  border: 2px solid var(--accent-green);
}
.article-card-header {
  display: flex;
  gap: 25px;
  padding: 30px;
}
@media (max-width: 768px) {
  .article-card-header {
    flex-direction: column;
  }
}
.article-image {
  width: 200px;
  height: 150px;
  border-radius: var(--border-radius);
  overflow: hidden;
  flex-shrink: 0;
}
.article-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.article-content {
  flex: 1;
}
.article-category {
  display: inline-block;
  background-color: var(--light-blue);
  color: var(--primary-blue);
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 10px;
}
.article-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--primary-blue);
  margin-bottom: 10px;
  text-decoration: none;
  display: block;
}
.article-title:hover {
  text-decoration: underline;
}
.article-meta {
  display: flex;
  gap: 15px;
  font-size: 14px;
  color: var(--dark-gray);
  margin-bottom: 15px;
}
.article-excerpt {
  color: var(--darker-gray);
  line-height: 1.6;
  margin-bottom: 15px;
}
.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.article-tag {
  background-color: var(--light-gray);
  color: var(--dark-gray);
  padding: 3px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 500;
  cursor: pointer;
}
.article-card-footer {
  background-color: var(--light-gray);
  padding: 15px 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--medium-gray);
}
.article-author {
  display: flex;
  align-items: center;
  gap: 10px;
}
.author-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--light-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-blue);
  font-size: 14px;
  font-weight: 600;
}
.author-name {
  font-size: 14px;
  color: var(--darker-gray);
}
.article-actions {
  display: flex;
  gap: 20px;
  align-items: center;
}

.like-btn {
  background: none;
  border: 1px solid var(--medium-gray);
  color: var(--dark-gray);
  border-radius: var(--border-radius);
  padding: 6px 10px;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.like-btn:hover {
  background-color: var(--light-blue);
  color: var(--primary-blue);
  border-color: var(--light-blue);
}
.like-btn.liked {
  background-color: var(--light-blue);
  color: var(--primary-blue);
  border-color: var(--light-blue);
}
.like-count {
  font-weight: 600;
}

/* 分页 */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  margin-top: 50px;
}
.pagination button {
  background-color: var(--white);
  border: 1px solid var(--medium-gray);
  color: var(--darker-gray);
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}
.pagination button:hover:not(:disabled) {
  background-color: var(--light-blue);
  color: var(--primary-blue);
}
.pagination button.active {
  background-color: var(--primary-blue);
  color: var(--white);
  border-color: var(--primary-blue);
}
.pagination button:disabled {
  color: var(--medium-gray);
  cursor: not-allowed;
}
.pagination span {
  color: var(--dark-gray);
}

.loading, .empty, .error {
  margin-top: 18px;
  text-align: center;
  color: var(--dark-gray);
}
.error {
  color: #d63031;
}

/* 底部样式 */
footer {
  background-color: var(--primary-blue);
  color: var(--white);
  padding: 60px 0 30px;
  margin-top: 50px;
}
.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}
.footer-column h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--white);
}
.footer-column ul {
  list-style: none;
}
.footer-column ul li {
  margin-bottom: 12px;
}
.footer-column ul li a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: var(--transition);
}
.footer-column ul li a:hover {
  color: var(--white);
  padding-left: 5px;
}
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}
.footer-disclaimer {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  max-width: 600px;
}
.social-links {
  display: flex;
  gap: 15px;
}
.social-links a {
  color: var(--white);
  background-color: rgba(255, 255, 255, 0.1);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: var(--transition);
}
.social-links a:hover {
  background-color: var(--accent-green);
  transform: translateY(-3px);
}
/* 响应式设计 */
@media (max-width: 992px) {
  .knowledge-page {
    flex-direction: column;
  }
  .sidebar {
    width: 100%;
  }
}
@media (max-width: 768px) {
  .mobile-menu-btn {
    display: block;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    width: 100%;
    background-color: var(--white);
    flex-direction: column;
    padding: 20px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    z-index: 100;
  }
  .nav-links.active {
    display: flex;
  }
  .articles-container {
    padding: 25px;
  }
  .page-title {
    font-size: 32px;
  }
}
@media (max-width: 576px) {
  .page-title {
    font-size: 28px;
  }
  .articles-container {
    padding: 20px;
  }
  .section-title {
    font-size: 24px;
  }
  .article-card-header {
    padding: 20px;
  }
  .article-image {
    width: 100%;
    height: 200px;
  }
}