/* ========================================
   电脑维护知识 - 知识库风格样式
   主色调: #7c6a46
   ======================================== */

/* CSS 变量 */
:root {
  --accent-color: #7c6a46;
  --accent-light: #9a8660;
  --accent-dark: #5c4f35;
  --text-primary: #333;
  --text-secondary: #666;
  --text-muted: #999;
  --bg-primary: #fff;
  --bg-secondary: #f8f6f3;
  --bg-tertiary: #f0ede8;
  --border-color: #e5e2dc;
  --link-color: #7c6a46;
  --link-hover: #5c4f35;
  --max-width: 1200px;
  --sidebar-width: 260px;
}

/* 重置 */
*, *::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;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
}

a {
  color: var(--link-color);
  text-decoration: none;
}

a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

ul, ol {
  list-style: none;
}

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

/* ========================================
   布局容器
   ======================================== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1rem;
}

/* ========================================
   页头
   ======================================== */
.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;
  padding: 1rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent-color);
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: var(--accent-color);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.875rem;
}

.nav {
  display: flex;
  gap: 1.5rem;
}

.nav a {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  padding: 0.25rem 0;
}

.nav a:hover,
.nav a.active {
  color: var(--accent-color);
  text-decoration: none;
}

.search-box {
  position: relative;
}

.search-box input {
  width: 240px;
  padding: 0.5rem 2.5rem 0.5rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 0.875rem;
  background: var(--bg-secondary);
}

.search-box input:focus {
  outline: none;
  border-color: var(--accent-color);
}

.search-btn {
  position: absolute;
  right: 0.5rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem;
}

/* ========================================
   面包屑
   ======================================== */
.breadcrumb {
  background: var(--bg-secondary);
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-color);
}

.breadcrumb ol {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumb li:not(:last-child)::after {
  content: ">";
  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);
}

/* ========================================
   Hero 区域
   ======================================== */
.hero {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  padding: 3rem 0;
  text-align: center;
}

.hero-title {
  font-size: 2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.hero-desc {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.hero-search {
  max-width: 600px;
  margin: 0 auto;
  position: relative;
}

.hero-search input {
  width: 100%;
  padding: 1rem 3rem 1rem 1.25rem;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  font-size: 1rem;
  background: var(--bg-primary);
}

.hero-search input:focus {
  outline: none;
  border-color: var(--accent-color);
}

.hero-search .search-btn {
  right: 1rem;
  font-size: 1.125rem;
}

/* ========================================
   主内容区
   ======================================== */
.main {
  padding: 2rem 0;
}

/* ========================================
   卡片
   ======================================== */
.card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.25rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.card:hover {
  border-color: var(--accent-light);
  box-shadow: 0 2px 8px rgba(124, 106, 70, 0.1);
}

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.card-title a {
  color: var(--text-primary);
}

.card-title a:hover {
  color: var(--accent-color);
  text-decoration: none;
}

.card-meta {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

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

/* ========================================
   区块标题
   ======================================== */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.section-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.section-title::before {
  content: "";
  width: 4px;
  height: 1.25rem;
  background: var(--accent-color);
  border-radius: 2px;
}

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

/* ========================================
   精选页面
   ======================================== */
.featured-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

/* ========================================
   分类导航
   ======================================== */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.category-card {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-weight: 500;
}

.category-card:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-light);
  text-decoration: none;
  color: var(--accent-color);
}

.category-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-color);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.category-info {
  flex: 1;
}

.category-name {
  font-size: 0.9375rem;
  font-weight: 500;
}

.category-count {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ========================================
   最近更新
   ======================================== */
.recent-list {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin-bottom: 2.5rem;
}

.recent-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-color);
}

.recent-item:last-child {
  border-bottom: none;
}

.recent-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-color);
  border-radius: 50%;
  flex-shrink: 0;
}

.recent-content {
  flex: 1;
}

.recent-title {
  font-size: 0.9375rem;
  color: var(--text-primary);
}

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

.recent-meta {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* ========================================
   三栏文章列表
   ======================================== */
.three-col-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.col-header {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--accent-color);
  margin-bottom: 1rem;
}

.col-list li {
  padding: 0.625rem 0;
  border-bottom: 1px dashed var(--border-color);
}

.col-list li:last-child {
  border-bottom: none;
}

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

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

/* ========================================
   分类页特定样式
   ======================================== */
.category-header {
  background: var(--bg-secondary);
  padding: 2rem 0;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
}

.category-header-inner {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
}

.category-header-icon {
  width: 64px;
  height: 64px;
  background: var(--accent-color);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 2rem;
  flex-shrink: 0;
}

.category-header-content {
  flex: 1;
}

.category-header-title {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.category-header-desc {
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.category-header-stats {
  display: flex;
  gap: 1.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.category-header-stats span {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

/* 页面列表 */
.page-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2rem;
}

.page-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
}

.page-item:hover {
  border-color: var(--accent-light);
}

.page-item-icon {
  width: 48px;
  height: 48px;
  background: var(--bg-tertiary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-color);
  font-size: 1.5rem;
  flex-shrink: 0;
}

.page-item-content {
  flex: 1;
}

.page-item-title {
  font-size: 1.0625rem;
  font-weight: 500;
  margin-bottom: 0.375rem;
}

.page-item-title a {
  color: var(--text-primary);
}

.page-item-title a:hover {
  color: var(--accent-color);
  text-decoration: none;
}

.page-item-meta {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.page-item-summary {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 子分类 */
.subcategory-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.subcategory-item {
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  text-align: center;
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.subcategory-item:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-light);
  color: var(--accent-color);
  text-decoration: none;
}

/* ========================================
   文章页特定样式
   ======================================== */
.article-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  gap: 2rem;
  align-items: start;
}

.article-sidebar {
  position: sticky;
  top: 80px;
}

.sidebar-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.sidebar-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.toc-list {
  font-size: 0.875rem;
}

.toc-list li {
  margin-bottom: 0.5rem;
}

.toc-list a {
  color: var(--text-secondary);
  display: block;
  padding: 0.25rem 0;
}

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

.toc-list .toc-h2 {
  padding-left: 0;
}

.toc-list .toc-h3 {
  padding-left: 1rem;
  font-size: 0.8125rem;
}

.related-list li {
  margin-bottom: 0.625rem;
}

.related-list a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

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

/* 文章内容 */
.article-content {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 2rem;
}

.article-header {
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.article-title {
  font-size: 1.875rem;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 0.75rem;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.article-meta span {
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

/* 信息框 */
.info-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent-color);
  border-radius: 0 8px 8px 0;
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.info-box-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.info-box-list {
  font-size: 0.9375rem;
}

.info-box-list li {
  padding: 0.375rem 0;
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.info-box-list li::before {
  content: "•";
  color: var(--accent-color);
}

/* 文章正文 */
.article-body {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.article-body h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 2rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 1.5rem 0 0.75rem;
}

.article-body p {
  margin-bottom: 1rem;
}

.article-body ul,
.article-body ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

.article-body ul {
  list-style: disc;
}

.article-body ol {
  list-style: decimal;
}

.article-body li {
  margin-bottom: 0.5rem;
}

.article-body code {
  background: var(--bg-tertiary);
  padding: 0.125rem 0.375rem;
  border-radius: 3px;
  font-family: "SF Mono", Monaco, "Cascadia Code", monospace;
  font-size: 0.875rem;
}

.article-body pre {
  background: var(--bg-tertiary);
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
  margin-bottom: 1rem;
}

.article-body pre code {
  background: none;
  padding: 0;
}

.article-body blockquote {
  border-left: 4px solid var(--accent-color);
  padding-left: 1rem;
  margin: 1rem 0;
  color: var(--text-secondary);
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1rem;
}

.article-body th,
.article-body td {
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  text-align: left;
}

.article-body th {
  background: var(--bg-secondary);
  font-weight: 600;
}

/* 标签 */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

.tag {
  padding: 0.375rem 0.75rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.tag:hover {
  background: var(--accent-color);
  border-color: var(--accent-color);
  color: #fff;
  text-decoration: none;
}

/* ========================================
   推荐文章
   ======================================== */
.recommended {
  background: var(--bg-secondary);
  padding: 2rem 0;
  margin-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.recommended-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.recommended-col {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.25rem;
}

.recommended-col-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--accent-color);
}

.recommended-list li {
  padding: 0.625rem 0;
  border-bottom: 1px dashed var(--border-color);
}

.recommended-list li:last-child {
  border-bottom: none;
}

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

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

/* ========================================
   404 页面
   ======================================== */
.error-page {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 3rem 1rem;
}

.error-content {
  max-width: 500px;
}

.error-code {
  font-size: 6rem;
  font-weight: 700;
  color: var(--accent-color);
  line-height: 1;
  margin-bottom: 1rem;
}

.error-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.error-desc {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.error-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  border-radius: 6px;
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}

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

.btn-primary:hover {
  background: var(--accent-dark);
  text-decoration: none;
  color: #fff;
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-tertiary);
  text-decoration: none;
  color: var(--text-primary);
}

/* ========================================
   页脚
   ======================================== */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 2rem 0;
  margin-top: 3rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.footer-links {
  display: flex;
  gap: 1.5rem;
}

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

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

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
  .article-layout {
    grid-template-columns: 200px 1fr;
    gap: 1.5rem;
  }
}

@media (max-width: 768px) {
  .header-inner {
    flex-wrap: wrap;
    gap: 1rem;
  }

  .nav {
    order: 3;
    width: 100%;
    justify-content: center;
    gap: 1rem;
  }

  .search-box {
    order: 2;
  }

  .search-box input {
    width: 160px;
  }

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

  .featured-grid,
  .three-col-grid,
  .recommended-grid {
    grid-template-columns: 1fr;
  }

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

  .article-layout {
    grid-template-columns: 1fr;
  }

  .article-sidebar {
    position: static;
    order: 2;
  }

  .article-main {
    order: 1;
  }

  .sidebar-section {
    margin-bottom: 1rem;
  }

  .toc-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .toc-list li {
    margin-bottom: 0;
  }

  .toc-list a {
    padding: 0.375rem 0.75rem;
    background: var(--bg-tertiary);
    border-radius: 4px;
  }

  .category-header-inner {
    flex-direction: column;
    text-align: center;
  }

  .category-header-stats {
    justify-content: center;
  }

  .page-item {
    flex-direction: column;
    gap: 0.75rem;
  }

  .page-item-icon {
    width: 40px;
    height: 40px;
    font-size: 1.25rem;
  }

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

  .error-code {
    font-size: 4rem;
  }

  .footer-inner {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .category-grid {
    grid-template-columns: 1fr;
  }

  .category-card {
    padding: 0.875rem 1rem;
  }

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

  .article-content {
    padding: 1.25rem;
  }

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

  .article-body h2 {
    font-size: 1.25rem;
  }

  .article-body h3 {
    font-size: 1.125rem;
  }

  .error-actions {
    flex-direction: column;
  }
}