/* 基础机械 - 知识库风格样式 */

:root {
  --accent-color: #7c6a46;
  --accent-light: #9a8660;
  --accent-dark: #5d4f35;
  --text-primary: #333;
  --text-secondary: #666;
  --text-muted: #999;
  --bg-primary: #fff;
  --bg-secondary: #f8f6f3;
  --bg-card: #fff;
  --border-color: #e5e2dc;
  --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;
  --radius-lg: 12px;
  --max-width: 1200px;
  --header-height: 64px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.7;
  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-dark);
}

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

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--accent-color);
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--accent-color);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 16px;
}

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

.nav a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 14px;
}

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

.search-box {
  position: relative;
  width: 240px;
}

.search-box input {
  width: 100%;
  padding: 8px 16px 8px 36px;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 14px;
  background: var(--bg-secondary);
  transition: all 0.2s;
}

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

.search-box::before {
  content: "🔍";
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 14px;
  opacity: 0.5;
}

/* Main Container */
.main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 24px;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 48px 24px;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  border-radius: var(--radius-lg);
  margin-bottom: 40px;
}

.hero h1 {
  font-size: 36px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

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

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

.hero-search input {
  width: 100%;
  padding: 16px 24px;
  font-size: 16px;
  border: 2px solid var(--border-color);
  border-radius: 32px;
  background: var(--bg-primary);
  transition: all 0.2s;
}

.hero-search input:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 4px 20px rgba(124, 106, 70, 0.15);
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-top: 32px;
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--accent-color);
}

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

/* Section Title */
.section-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-title::before {
  content: "";
  width: 4px;
  height: 20px;
  background: var(--accent-color);
  border-radius: 2px;
}

/* Card Grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

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

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--accent-light);
}

.card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.card-summary {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}

.card-meta {
  font-size: 12px;
  color: var(--text-muted);
}

/* Category Grid */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 40px;
}

.category-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 20px;
  border: 1px solid var(--border-color);
  text-align: center;
  transition: all 0.2s;
}

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

.category-card:hover .category-name {
  color: #fff;
}

.category-card:hover .category-count {
  color: rgba(255,255,255,0.8);
}

.category-icon {
  font-size: 32px;
  margin-bottom: 12px;
}

.category-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.category-count {
  font-size: 12px;
  color: var(--text-muted);
}

/* Recent Updates */
.update-list {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  margin-bottom: 40px;
}

.update-item {
  padding: 16px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 16px;
}

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

.update-type {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 12px;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  white-space: nowrap;
}

.update-type.new {
  background: #e8f5e9;
  color: #2e7d32;
}

.update-type.edit {
  background: #e3f2fd;
  color: #1565c0;
}

.update-content {
  flex: 1;
}

.update-title {
  font-size: 14px;
  color: var(--text-primary);
  font-weight: 500;
}

.update-meta {
  font-size: 12px;
  color: var(--text-muted);
}

/* Three Column Section */
.three-col {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

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

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

.col-list {
  list-style: none;
}

.col-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--border-color);
  font-size: 14px;
}

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

.col-list a {
  color: var(--text-secondary);
  display: block;
}

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

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
  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;
}

/* Page Header */
.page-header {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 32px;
  border: 1px solid var(--border-color);
  margin-bottom: 24px;
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.page-desc {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.page-stats {
  display: flex;
  gap: 24px;
  font-size: 13px;
  color: var(--text-muted);
}

/* Article List */
.article-list {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  margin-bottom: 24px;
}

.article-item {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

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

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

.article-content {
  flex: 1;
}

.article-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.article-summary {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 8px;
}

.article-meta {
  font-size: 12px;
  color: var(--text-muted);
}

/* Sub Categories */
.sub-category-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.sub-category-tag {
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 14px;
  color: var(--text-secondary);
  transition: all 0.2s;
}

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

/* Article Page Layout */
.article-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 32px;
}

.sidebar {
  position: sticky;
  top: 88px;
  height: fit-content;
}

.sidebar-section {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 20px;
  border: 1px solid var(--border-color);
  margin-bottom: 20px;
}

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

.toc-list {
  list-style: none;
}

.toc-list li {
  margin-bottom: 8px;
}

.toc-list a {
  font-size: 14px;
  color: var(--text-secondary);
  display: block;
  padding: 6px 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);
}

.related-list {
  list-style: none;
}

.related-list li {
  margin-bottom: 12px;
}

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

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

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

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

.article-h1 {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.3;
}

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

.info-box {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 24px;
  border-left: 4px solid var(--accent-color);
}

.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-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.info-item {
  display: flex;
  gap: 8px;
}

.info-label {
  font-size: 13px;
  color: var(--text-muted);
  min-width: 60px;
}

.info-value {
  font-size: 13px;
  color: var(--text-primary);
  font-weight: 500;
}

.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: 32px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.article-body h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 24px 0 12px;
}

.article-body p {
  margin-bottom: 16px;
}

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

.article-body li {
  margin-bottom: 8px;
}

/* 404 Page */
.error-page {
  text-align: center;
  padding: 80px 24px;
  max-width: 600px;
  margin: 0 auto;
}

.error-code {
  font-size: 120px;
  font-weight: 700;
  color: var(--accent-color);
  line-height: 1;
  margin-bottom: 16px;
  opacity: 0.3;
}

.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-card);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

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

/* Footer */
.footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  padding: 40px 24px;
  margin-top: 40px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 32px;
}

.footer-brand {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
}

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

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

.footer-links {
  list-style: none;
}

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

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

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

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 1024px) {
  .article-layout {
    grid-template-columns: 1fr;
  }

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

  .article-main {
    order: 1;
  }

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

@media (max-width: 768px) {
  .header-inner {
    padding: 0 16px;
  }

  .nav {
    display: none;
  }

  .search-box {
    width: 160px;
  }

  .main {
    padding: 20px 16px;
  }

  .hero {
    padding: 32px 20px;
  }

  .hero h1 {
    font-size: 24px;
  }

  .hero-stats {
    gap: 24px;
  }

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

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

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

  .article-main {
    padding: 24px;
  }

  .article-h1 {
    font-size: 24px;
  }

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

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

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

  .hero-stats {
    flex-direction: column;
    gap: 16px;
  }

  .info-box-grid {
    grid-template-columns: 1fr;
  }
}