/* ========================================
   机械表 - 知识库风格样式表
   www.haohuabiao.cn
   ======================================== */

/* CSS 变量 */
:root {
  --accent-color: #7c6a46;
  --accent-light: #a08b5f;
  --accent-dark: #5a4d33;
  --text-primary: #333;
  --text-secondary: #666;
  --text-muted: #999;
  --bg-primary: #fff;
  --bg-secondary: #f8f6f3;
  --bg-card: #fff;
  --border-color: #e5e2dc;
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --max-width: 1200px;
  --header-height: 64px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-secondary);
}

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

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

ul {
  list-style: none;
}

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

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

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

/* 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;
  height: var(--header-height);
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-color);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
}

.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 {
  position: relative;
  width: 280px;
}

.search-box input {
  width: 100%;
  padding: 10px 40px 10px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 14px;
  background: var(--bg-secondary);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.search-box input:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(124, 106, 70, 0.1);
}

.search-box button {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
}

/* 页脚 */
.footer {
  background: var(--bg-primary);
  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 p {
  color: var(--text-secondary);
  margin-top: 12px;
  font-size: 14px;
}

.footer-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

.footer-links a {
  color: var(--text-secondary);
  font-size: 14px;
}

.footer-links 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: 14px;
}

/* ========================================
   首页组件
   ======================================== */

/* Hero 区域 */
.hero {
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  padding: 64px 0;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}

.hero-title {
  font-size: 40px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.hero-desc {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 32px;
}

.hero-search {
  max-width: 560px;
  margin: 0 auto;
}

.hero-search input {
  width: 100%;
  padding: 16px 24px;
  font-size: 16px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: var(--bg-primary);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.hero-search input:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 4px rgba(124, 106, 70, 0.1);
}

/* 区块标题 */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

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

.section-more {
  font-size: 14px;
  color: var(--accent-color);
}

/* 特色页面卡片 */
.featured-section {
  padding: 48px 0;
}

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

.featured-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: box-shadow 0.2s, transform 0.2s;
}

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

.featured-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.featured-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.featured-card .meta {
  display: flex;
  gap: 16px;
  margin-top: 16px;
  font-size: 13px;
  color: var(--text-muted);
}

/* 分类导航 */
.category-section {
  padding: 48px 0;
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.category-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  transition: all 0.2s;
}

.category-card:hover {
  background: var(--accent-color);
  border-color: var(--accent-color);
}

.category-card:hover h3,
.category-card:hover p {
  color: #fff;
}

.category-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text-primary);
}

.category-card p {
  font-size: 13px;
  color: var(--text-secondary);
}

/* 最近更新 */
.updates-section {
  padding: 48px 0;
}

.updates-list {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px 24px;
}

.update-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
}

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

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

.update-content {
  flex: 1;
}

.update-content a {
  color: var(--text-primary);
  font-weight: 500;
}

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

.update-meta {
  font-size: 13px;
  color: var(--text-muted);
}

/* 三栏文章列表 */
.articles-section {
  padding: 48px 0;
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
}

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

.article-list h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent-color);
}

.article-list ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.article-list li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.article-list li::before {
  content: "•";
  color: var(--accent-color);
  font-weight: bold;
}

.article-list a {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.5;
}

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

/* ========================================
   分类页组件
   ======================================== */

/* 面包屑 */
.breadcrumb {
  padding: 16px 0;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
}

.breadcrumb-inner {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-secondary);
}

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

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

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

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

/* 分类头部 */
.category-header {
  padding: 48px 0 32px;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
}

.category-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.category-desc {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 700px;
}

.category-stats {
  display: flex;
  gap: 24px;
  margin-top: 20px;
  font-size: 14px;
  color: var(--text-muted);
}

.category-stats span {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* 页面列表 */
.pages-section {
  padding: 32px 0;
}

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

.page-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  transition: box-shadow 0.2s;
}

.page-item:hover {
  box-shadow: var(--shadow-md);
}

.page-icon {
  width: 48px;
  height: 48px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-color);
  font-size: 20px;
  flex-shrink: 0;
}

.page-content {
  flex: 1;
}

.page-content h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 6px;
}

.page-content h3 a {
  color: var(--text-primary);
}

.page-content h3 a:hover {
  color: var(--accent-color);
}

.page-content p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.page-meta {
  display: flex;
  gap: 16px;
  margin-top: 12px;
  font-size: 13px;
  color: var(--text-muted);
}

/* 子分类 */
.subcategory-section {
  padding: 32px 0;
  border-top: 1px solid var(--border-color);
}

.subcategory-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.subcategory-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 100px;
  font-size: 14px;
  color: var(--text-secondary);
  transition: all 0.2s;
}

.subcategory-tag:hover {
  background: var(--accent-color);
  border-color: var(--accent-color);
  color: #fff;
}

.subcategory-tag span {
  font-size: 12px;
  color: var(--text-muted);
  background: var(--bg-card);
  padding: 2px 8px;
  border-radius: 100px;
}

.subcategory-tag:hover span {
  background: rgba(255,255,255,0.2);
  color: #fff;
}

/* 推荐文章 */
.recommended-section {
  padding: 32px 0;
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
}

.recommended-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 32px;
}

.recommended-tags a {
  padding: 8px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text-secondary);
}

.recommended-tags a:hover {
  background: var(--accent-color);
  border-color: var(--accent-color);
  color: #fff;
}

/* ========================================
   文章页组件
   ======================================== */

/* 文章布局 */
.article-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 48px;
  padding: 32px 0;
}

/* 侧边栏 */
.sidebar {
  position: sticky;
  top: 96px;
  height: fit-content;
}

.toc-box,
.related-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 20px;
}

.toc-title,
.related-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toc-list a {
  font-size: 14px;
  color: var(--text-secondary);
  display: block;
  padding: 4px 0;
  border-left: 2px solid transparent;
  padding-left: 12px;
  margin-left: -12px;
}

.toc-list a:hover,
.toc-list a.active {
  color: var(--accent-color);
  border-left-color: var(--accent-color);
}

.toc-list a.h2 {
  font-weight: 500;
  color: var(--text-primary);
}

.toc-list a.h3 {
  padding-left: 24px;
  font-size: 13px;
}

.related-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.related-list a {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
}

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

/* 文章主体 */
.article-main {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 40px;
}

.article-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

.article-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 16px;
}

.article-meta {
  display: flex;
  gap: 20px;
  font-size: 14px;
  color: var(--text-muted);
}

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

/* 信息框 */
.info-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent-color);
  border-radius: var(--radius-sm);
  padding: 20px;
  margin-bottom: 24px;
}

.info-box-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.info-box-content {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.info-box-content dl {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 8px 16px;
}

.info-box-content dt {
  color: var(--text-muted);
}

.info-box-content dd {
  color: var(--text-primary);
  font-weight: 500;
}

/* 文章内容 */
.article-body {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-primary);
}

.article-body h2 {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 40px 0 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.article-body h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 32px 0 16px;
}

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

.article-body ul,
.article-body ol {
  margin-bottom: 16px;
  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);
}

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

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

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

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

.error-page {
  min-height: calc(100vh - var(--header-height) - 300px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 64px 20px;
  text-align: center;
}

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

.error-code {
  font-size: 120px;
  font-weight: 700;
  color: var(--accent-color);
  line-height: 1;
  margin-bottom: 16px;
  opacity: 0.8;
}

.error-title {
  font-size: 28px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.error-desc {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}

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

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

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

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

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

@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .article-layout {
    grid-template-columns: 200px 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

  .header-inner {
    flex-wrap: wrap;
  }

  .nav {
    display: none;
  }

  .search-box {
    width: auto;
    flex: 1;
    margin-left: 16px;
  }

  .hero {
    padding: 40px 0;
  }

  .hero-title {
    font-size: 28px;
  }

  .hero-desc {
    font-size: 16px;
  }

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

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

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

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

  .article-main {
    order: 1;
    padding: 24px;
  }

  .article-title {
    font-size: 24px;
  }

  .page-item {
    flex-direction: column;
    gap: 16px;
  }

  .error-code {
    font-size: 80px;
  }

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

  .subcategory-grid {
    justify-content: center;
  }
}

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

  .section-title {
    font-size: 20px;
  }

  .category-title {
    font-size: 24px;
  }

  .article-body h2 {
    font-size: 20px;
  }

  .article-body h3 {
    font-size: 18px;
  }
}