/* 数字插图 - 样式表 */
/* 变量定义 */
:root {
  --accent-color: #0066cc;
  --accent-hover: #0052a3;
  --text-primary: #333;
  --text-secondary: #666;
  --text-muted: #999;
  --bg-primary: #fff;
  --bg-secondary: #f8f9fa;
  --bg-card: #fff;
  --border-color: #e5e5e5;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-hover: 0 4px 16px rgba(0,0,0,0.12);
  --radius: 8px;
  --gap: 24px;
  --max-width: 1200px;
  --sidebar-width: 280px;
}

/* 重置样式 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-secondary);
}

a {
  color: var(--accent-color);
  text-decoration: none;
  transition: color 0.2s;
}

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

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

ul {
  list-style: none;
}

/* 容器 */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gap);
}

/* 头部 */
.header {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.logo span {
  color: var(--accent-color);
}

.nav {
  display: flex;
  gap: 32px;
}

.nav a {
  color: var(--text-secondary);
  font-weight: 500;
  padding: 8px 0;
  border-bottom: 2px solid transparent;
}

.nav a:hover,
.nav a.active {
  color: var(--accent-color);
  border-bottom-color: var(--accent-color);
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  padding: 8px 16px;
  width: 240px;
}

.search-box input {
  border: none;
  background: none;
  outline: none;
  flex: 1;
  font-size: 0.875rem;
}

.search-box button {
  border: none;
  background: none;
  cursor: pointer;
  color: var(--text-muted);
}

/* 主体布局 */
.main-wrapper {
  display: grid;
  grid-template-columns: 1fr var(--sidebar-width);
  gap: var(--gap);
  padding: var(--gap) 0;
}

.main-content {
  min-width: 0;
}

.sidebar {
  width: var(--sidebar-width);
}

/* Hero 区域 */
.hero {
  background: linear-gradient(135deg, var(--accent-color) 0%, #4a90d9 100%);
  color: #fff;
  padding: 64px var(--gap);
  text-align: center;
  margin-bottom: var(--gap);
  border-radius: var(--radius);
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.hero p {
  font-size: 1.125rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto 24px;
}

.hero-cta {
  display: inline-flex;
  gap: 16px;
}

.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-weight: 500;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
  font-size: 1rem;
}

.btn-primary {
  background: #fff;
  color: var(--accent-color);
}

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

.btn-secondary {
  background: rgba(255,255,255,0.2);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.3);
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.3);
  color: #fff;
}

/* 区块标题 */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.section-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  padding-left: 12px;
  border-left: 4px solid var(--accent-color);
}

.view-more {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.view-more:hover {
  color: var(--accent-color);
}

/* 特色内容网格 */
.featured-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: var(--gap);
}

.featured-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}

.featured-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.featured-card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.featured-card .content {
  padding: 16px;
}

.featured-card h3 {
  font-size: 1rem;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.featured-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* 文章卡片 */
.article-card {
  display: flex;
  gap: 16px;
  padding: 20px;
  background: var(--bg-card);
  border-radius: var(--radius);
  margin-bottom: 16px;
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s;
}

.article-card:hover {
  box-shadow: var(--shadow-hover);
}

.article-card .thumb {
  width: 160px;
  height: 100px;
  border-radius: 6px;
  object-fit: cover;
  flex-shrink: 0;
}

.article-card .content {
  flex: 1;
  min-width: 0;
}

.article-card h3 {
  font-size: 1.0625rem;
  margin-bottom: 8px;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.article-card .excerpt {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 12px;
}

.article-card .meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.article-card .meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* 侧边栏组件 */
.sidebar-widget {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
}

.sidebar-widget h4 {
  font-size: 1rem;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-widget ul li {
  padding: 10px 0;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-widget ul li:last-child {
  border-bottom: none;
}

.sidebar-widget ul li a {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-widget ul li a:hover {
  color: var(--accent-color);
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 20px;
  background: var(--bg-card);
  border-radius: var(--radius);
  margin-bottom: 20px;
  font-size: 0.875rem;
}

.breadcrumb a {
  color: var(--text-secondary);
}

.breadcrumb a:hover {
  color: var(--accent-color);
}

.breadcrumb .sep {
  color: var(--text-muted);
}

.breadcrumb .current {
  color: var(--text-primary);
}

/* 分类页标题 */
.category-header {
  background: var(--bg-card);
  padding: 32px;
  border-radius: var(--radius);
  margin-bottom: 24px;
  box-shadow: var(--shadow);
}

.category-header h1 {
  font-size: 1.75rem;
  margin-bottom: 12px;
}

.category-header p {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* 分页 */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 32px;
  padding: 20px;
}

.pagination a,
.pagination span {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 12px;
  border-radius: var(--radius);
  font-size: 0.9375rem;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
}

.pagination a:hover {
  color: var(--accent-color);
  border-color: var(--accent-color);
}

.pagination .current {
  background: var(--accent-color);
  color: #fff;
  border-color: var(--accent-color);
}

.pagination .prev,
.pagination .next {
  padding: 0 16px;
}

/* 文章详情页 */
.article-header {
  background: var(--bg-card);
  padding: 32px;
  border-radius: var(--radius);
  margin-bottom: 24px;
  box-shadow: var(--shadow);
}

.article-header h1 {
  font-size: 1.75rem;
  line-height: 1.4;
  margin-bottom: 16px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.article-meta .author {
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-meta .author img {
  width: 32px;
  height: 32px;
  border-radius: 50%;
}

.article-featured-image {
  margin-bottom: 24px;
  border-radius: var(--radius);
  overflow: hidden;
}

.article-featured-image img {
  width: 100%;
  max-height: 400px;
  object-fit: cover;
}

.article-body {
  background: var(--bg-card);
  padding: 32px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  font-size: 1.0625rem;
  line-height: 1.8;
}

.article-body h2 {
  font-size: 1.5rem;
  margin: 32px 0 16px;
  color: var(--text-primary);
}

.article-body h3 {
  font-size: 1.25rem;
  margin: 24px 0 12px;
  color: var(--text-primary);
}

.article-body p {
  margin-bottom: 16px;
  color: var(--text-secondary);
}

.article-body img {
  width: 100%;
  border-radius: var(--radius);
  margin: 24px 0;
}

.article-body ul,
.article-body ol {
  margin: 16px 0;
  padding-left: 24px;
}

.article-body ul li {
  list-style: disc;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

.article-body ol li {
  list-style: decimal;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

/* 404页面 */
.error-page {
  text-align: center;
  padding: 80px var(--gap);
}

.error-code {
  font-size: 8rem;
  font-weight: 700;
  color: var(--accent-color);
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-size: 1.5rem;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.error-desc {
  color: var(--text-secondary);
  margin-bottom: 32px;
}

/* 页脚 */
.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  padding: 48px 0 24px;
  margin-top: 48px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  color: var(--text-secondary);
  margin-top: 16px;
  font-size: 0.9375rem;
  line-height: 1.7;
}

.footer-links h5 {
  font-size: 1rem;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.footer-links ul li {
  margin-bottom: 10px;
}

.footer-links ul li a {
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

.footer-links ul li a:hover {
  color: var(--accent-color);
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* 响应式设计 */
@media (max-width: 1024px) {
  .main-wrapper {
    grid-template-columns: 1fr;
  }

  .sidebar {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .sidebar-widget {
    margin-bottom: 0;
  }

  .featured-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .header-inner {
    flex-wrap: wrap;
    height: auto;
    padding: 12px 0;
    gap: 12px;
  }

  .nav {
    order: 3;
    width: 100%;
    gap: 20px;
    justify-content: center;
    padding-top: 8px;
    border-top: 1px solid var(--border-color);
  }

  .search-box {
    width: auto;
    flex: 1;
  }

  .hero {
    padding: 40px var(--gap);
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .hero-cta {
    flex-direction: column;
    width: 100%;
    padding: 0 20px;
  }

  .hero-cta .btn {
    width: 100%;
  }

  .featured-grid {
    grid-template-columns: 1fr;
  }

  .article-card {
    flex-direction: column;
  }

  .article-card .thumb {
    width: 100%;
    height: 180px;
  }

  .sidebar {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .error-code {
    font-size: 5rem;
  }

  .article-header,
  .article-body {
    padding: 20px;
  }

  .article-header h1 {
    font-size: 1.375rem;
  }
}

@media (max-width: 480px) {
  :root {
    --gap: 16px;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .pagination {
    flex-wrap: wrap;
  }
}