/* 全局样式 */
:root {
  --primary-color: #3498db;
  --secondary-color: #2980b9;
  --text-color: #333;
  --light-text: #666;
  --lighter-text: #999;
  --bg-color: #fff;
  --light-bg: #f5f5f5;
  --border-color: #ddd;
  --success-color: #2ecc71;
  --warning-color: #f39c12;
  --danger-color: #e74c3c;
  --container-width: 1200px;
  --header-height: 60px;
  --footer-height: 80px;
  --sidebar-width: 300px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--bg-color);
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--secondary-color);
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
}

.btn {
  display: inline-block;
  padding: 8px 16px;
  background-color: var(--light-bg);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn:hover {
  background-color: var(--border-color);
}

.btn-primary {
  background-color: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

.btn-primary:hover {
  background-color: var(--secondary-color);
  border-color: var(--secondary-color);
}

.hidden {
  display: none !important;
}

.loading {
  text-align: center;
  padding: 20px;
  color: var(--lighter-text);
}

/* 头部样式 */
.site-header {
  background-color: var(--bg-color);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  display: flex;
  align-items: center;
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.site-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary-color);
}

.site-nav ul {
  display: flex;
}

.site-nav li {
  margin-left: 20px;
}

.site-nav a {
  color: var(--text-color);
  font-weight: 500;
  padding: 5px 0;
  position: relative;
}

.site-nav a:hover {
  color: var(--primary-color);
}

.site-nav a.active {
  color: var(--primary-color);
}

.site-nav a.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--primary-color);
}

/* 主内容区域 */
main.container {
  display: flex;
  padding-top: 30px;
  padding-bottom: 50px;
  min-height: calc(100vh - var(--header-height) - var(--footer-height));
}

/* 文章列表 */
.articles {
  flex: 1;
  margin-right: 30px;
}

.articles h2 {
  margin-bottom: 20px;
  font-size: 28px;
  color: var(--text-color);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 30px;
}

.article-card {
  background-color: var(--bg-color);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.article-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.article-content {
  padding: 20px;
}

.article-title {
  font-size: 20px;
  margin-bottom: 10px;
  color: var(--text-color);
}

.article-summary {
  color: var(--light-text);
  margin-bottom: 15px;
  font-size: 14px;
  line-height: 1.5;
}

.article-meta {
  display: flex;
  justify-content: space-between;
  color: var(--lighter-text);
  font-size: 12px;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: 10px;
}

.article-tag {
  background-color: var(--light-bg);
  color: var(--light-text);
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 12px;
}

/* 侧边栏 */
.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
}

.widget {
  background-color: var(--bg-color);
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 30px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.widget h3 {
  margin-bottom: 15px;
  font-size: 18px;
  color: var(--text-color);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
}

.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-item {
  background-color: var(--light-bg);
  color: var(--light-text);
  padding: 5px 10px;
  border-radius: 4px;
  font-size: 14px;
  transition: background-color 0.3s ease, color 0.3s ease;
}

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

/* 分页 */
.pagination {
  display: flex;
  justify-content: center;
  margin-top: 30px;
}

.pagination-item {
  margin: 0 5px;
}

.pagination-link {
  display: inline-block;
  padding: 8px 12px;
  background-color: var(--light-bg);
  color: var(--text-color);
  border-radius: 4px;
  transition: all 0.3s ease;
}

.pagination-link:hover {
  background-color: var(--border-color);
}

.pagination-link.active {
  background-color: var(--primary-color);
  color: white;
}

/* 页脚 */
.site-footer {
  background-color: var(--light-bg);
  color: var(--light-text);
  padding: 30px 0;
  text-align: center;
  height: var(--footer-height);
}

/* 响应式设计 */
@media (max-width: 992px) {
  main.container {
    flex-direction: column;
  }
  
  .articles {
    margin-right: 0;
    margin-bottom: 30px;
  }
  
  .sidebar {
    width: 100%;
  }
}

@media (max-width: 768px) {
  .articles-grid {
    grid-template-columns: 1fr;
  }
  
  .site-header .container {
    flex-direction: column;
    padding: 10px 0;
  }
  
  .site-nav {
    margin-top: 10px;
  }
  
  .site-nav ul {
    justify-content: center;
  }
  
  .site-header {
    height: auto;
    position: relative;
  }
  
  main.container {
    min-height: calc(100vh - var(--footer-height));
  }
}

@media (max-width: 480px) {
  .site-nav li {
    margin-left: 10px;
  }
}