/* ========================================
   IT系统服务 - 全局样式
   风格: 政策风格 (legal-policy)
   主色调: #546e7a
   ======================================== */

/* CSS 变量定义 */
:root {
  --accent-color: #546e7a;
  --accent-dark: #37474f;
  --accent-light: #78909c;
  --text-primary: #212121;
  --text-secondary: #616161;
  --text-muted: #9e9e9e;
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f5;
  --bg-tertiary: #fafafa;
  --border-color: #e0e0e0;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --radius-sm: 4px;
  --radius-md: 8px;
  --max-width: 1200px;
  --content-max-width: 800px;
}

/* 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-color: var(--bg-primary);
}

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

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

ul, ol {
  list-style: none;
}

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

/* ========================================
   布局组件
   ======================================== */

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

.content-wrapper {
  max-width: var(--content-max-width);
  margin: 0 auto;
}

/* ========================================
   页头 Header
   ======================================== */

.header {
  background-color: 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: 1.25rem;
  font-weight: 700;
  color: var(--accent-color);
}

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

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

.nav a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 8px 0;
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
}

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

.search-box {
  display: flex;
  align-items: center;
  gap: 8px;
}

.search-box input {
  width: 200px;
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  outline: none;
  transition: border-color 0.2s ease;
}

.search-box input:focus {
  border-color: var(--accent-color);
}

.search-box button {
  padding: 8px 16px;
  background-color: var(--accent-color);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.search-box button:hover {
  background-color: var(--accent-dark);
}

/* ========================================
   页脚 Footer
   ======================================== */

.footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 48px 0 24px;
  margin-top: 64px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 32px;
}

.footer-brand .logo {
  margin-bottom: 16px;
  display: inline-block;
}

.footer-brand p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.footer-column h4 {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
}

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

.footer-column ul li a {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

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

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

.footer-bottom p {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ========================================
   面包屑导航 Breadcrumb
   ======================================== */

.breadcrumb {
  background-color: var(--bg-tertiary);
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
}

.breadcrumb ol {
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.breadcrumb li:not(:last-child)::after {
  content: ">";
  margin-left: 8px;
  color: var(--text-muted);
}

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

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

.breadcrumb li:last-child {
  color: var(--text-primary);
  font-weight: 500;
}

/* ========================================
   Hero 区域
   ======================================== */

.hero {
  background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-dark) 100%);
  color: white;
  padding: 80px 0;
  text-align: center;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.3;
}

.hero-desc {
  font-size: 1.125rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto 32px;
}

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

.btn {
  display: inline-block;
  padding: 12px 28px;
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
}

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

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

.btn-secondary {
  background-color: transparent;
  color: white;
  border: 1px solid rgba(255,255,255,0.5);
}

.btn-secondary:hover {
  background-color: rgba(255,255,255,0.1);
  color: white;
}

/* ========================================
   特色服务区域
   ======================================== */

.features {
  padding: 64px 0;
  background-color: var(--bg-primary);
}

.section-title {
  font-size: 1.75rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 48px;
  color: var(--text-primary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px;
  text-align: center;
  transition: all 0.2s ease;
}

.feature-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.feature-icon {
  width: 64px;
  height: 64px;
  background-color: var(--accent-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  color: white;
  font-size: 1.5rem;
}

.feature-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.feature-card p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ========================================
   内容列表
   ======================================== */

.content-section {
  padding: 64px 0;
}

.content-section.alt {
  background-color: var(--bg-secondary);
}

.content-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.content-item {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  gap: 20px;
  transition: all 0.2s ease;
}

.content-item:hover {
  box-shadow: var(--shadow-sm);
  border-color: var(--accent-light);
}

.content-thumb {
  width: 160px;
  height: 100px;
  background-color: var(--bg-secondary);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.content-body {
  flex: 1;
}

.content-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.content-title a {
  color: inherit;
}

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

.content-meta {
  display: flex;
  gap: 16px;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

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

.content-excerpt {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ========================================
   三栏内容区
   ======================================== */

.three-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  padding: 48px 0;
}

.column-box {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
}

.column-box h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent-color);
}

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

.column-box ul li:last-child {
  border-bottom: none;
}

.column-box ul li a {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.column-box ul li a:hover {
  color: var(--accent-color);
}

.column-box .date {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ========================================
   分类页样式
   ======================================== */

.category-header {
  background-color: var(--bg-tertiary);
  padding: 48px 0;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}

.category-title {
  font-size: 2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.category-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 16px;
}

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

.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 32px;
}

.pagination a,
.pagination span {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  color: var(--text-secondary);
  transition: all 0.2s ease;
}

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

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

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

/* ========================================
   文章详情页样式
   ======================================== */

.article-header {
  padding: 48px 0 32px;
  text-align: center;
}

.article-title {
  font-size: 2rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
  margin-bottom: 20px;
}

.article-meta {
  display: flex;
  justify-content: center;
  gap: 24px;
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.article-meta span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.article-featured-image {
  width: 100%;
  max-width: 800px;
  height: 400px;
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  margin: 0 auto 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 1rem;
}

.article-content {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 48px 0 20px;
  color: var(--text-primary);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 32px 0 16px;
  color: var(--text-primary);
}

.article-content p {
  margin-bottom: 20px;
  color: var(--text-secondary);
}

.article-content ul,
.article-content ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

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

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

.article-content strong {
  color: var(--text-primary);
  font-weight: 600;
}

.article-content a {
  color: var(--accent-color);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.article-content blockquote {
  background-color: var(--bg-tertiary);
  border-left: 4px solid var(--accent-color);
  padding: 20px 24px;
  margin: 24px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.article-content blockquote p {
  margin-bottom: 0;
  color: var(--text-secondary);
  font-style: italic;
}

/* 相关文章 */
.related-articles {
  margin-top: 64px;
  padding-top: 48px;
  border-top: 1px solid var(--border-color);
}

.related-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 24px;
  color: var(--text-primary);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.related-item {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: all 0.2s ease;
}

.related-item:hover {
  box-shadow: var(--shadow-sm);
  border-color: var(--accent-light);
}

.related-item h4 {
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 8px;
}

.related-item h4 a {
  color: var(--text-primary);
}

.related-item h4 a:hover {
  color: var(--accent-color);
}

.related-item .date {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ========================================
   404 页面
   ======================================== */

.error-page {
  min-height: calc(100vh - 64px - 280px);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 64px 20px;
}

.error-content {
  max-width: 480px;
}

.error-code {
  font-size: 8rem;
  font-weight: 700;
  color: var(--accent-color);
  line-height: 1;
  margin-bottom: 16px;
  opacity: 0.8;
}

.error-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.error-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.error-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
}

.btn-outline {
  background-color: transparent;
  color: var(--accent-color);
  border: 1px solid var(--accent-color);
}

.btn-outline:hover {
  background-color: var(--accent-color);
  color: white;
}

/* ========================================
   响应式设计
   ======================================== */

@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .three-columns {
    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: 16px;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .nav a {
    white-space: nowrap;
    font-size: 0.875rem;
  }

  .search-box {
    order: 2;
  }

  .search-box input {
    width: 140px;
  }

  .hero {
    padding: 48px 0;
  }

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

  .hero-desc {
    font-size: 1rem;
  }

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

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

  .content-item {
    flex-direction: column;
  }

  .content-thumb {
    width: 100%;
    height: 160px;
  }

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

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

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

  .article-title {
    font-size: 1.5rem;
  }

  .article-meta {
    flex-wrap: wrap;
    gap: 12px;
  }

  .article-featured-image {
    height: 200px;
  }

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

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .search-box input {
    width: 100px;
    padding: 6px 10px;
  }

  .search-box button {
    padding: 6px 12px;
  }

  .feature-card {
    padding: 24px;
  }

  .pagination a,
  .pagination span {
    min-width: 36px;
    height: 36px;
    font-size: 0.875rem;
  }
}