/* ========================================
   昆虫饲养 - 百科风格样式表
   www.chongzhisiji.cn
   专注昆虫养殖的商业化应用
   ======================================== */

/* CSS 变量定义 */
:root {
  --accent-color: #607d8b;
  --accent-light: #78909c;
  --accent-dark: #455a64;
  --text-primary: #333;
  --text-secondary: #666;
  --text-muted: #999;
  --bg-primary: #fff;
  --bg-secondary: #f5f7f9;
  --bg-tertiary: #eceff1;
  --border-color: #e0e0e0;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.1);
  --radius-sm: 4px;
  --radius-md: 8px;
  --max-width: 1400px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", Monaco, "Cascadia Code", monospace;
}

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

html {
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--bg-primary);
}

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

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

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

ul, ol {
  list-style: none;
}

/* ========================================
   布局容器
   ======================================== */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

.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 {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.logo:hover {
  text-decoration: none;
  color: var(--text-primary);
}

.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: 1rem;
}

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

.nav-link.active {
  color: var(--accent-color);
}

.search-box {
  position: relative;
}

.search-input {
  width: 240px;
  height: 40px;
  padding: 0 40px 0 16px;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 0.875rem;
  background: var(--bg-secondary);
  transition: all 0.2s;
}

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

.search-btn {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.875rem;
}

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

.footer {
  background: 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 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 12px;
}

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

.footer-title {
  font-size: 0.875rem;
  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: 0.875rem;
}

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

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* ========================================
   面包屑 Breadcrumb
   ======================================== */

.breadcrumb {
  background: var(--bg-secondary);
  padding: 12px 0;
  font-size: 0.8125rem;
}

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

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

.breadcrumb-item:not(:last-child)::after {
  content: "/";
  color: var(--text-muted);
}

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

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

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

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

.hero {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  padding: 64px 0;
  text-align: center;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.3;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

.hero-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.hero-feature {
  background: var(--bg-primary);
  padding: 32px 24px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.hero-feature-icon {
  width: 56px;
  height: 56px;
  background: var(--accent-color);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  color: #fff;
  font-size: 1.5rem;
}

.hero-feature-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.hero-feature-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ========================================
   内容卡片
   ======================================== */

.section {
  padding: 48px 0;
}

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

.section-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

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

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

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

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

.card-image {
  width: 100%;
  height: 180px;
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.card-body {
  padding: 20px;
}

.card-category {
  font-size: 0.75rem;
  color: var(--accent-color);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
}

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

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

.card-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}

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

/* ========================================
   列表组件
   ======================================== */

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

.list-section {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 24px;
}

.list-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent-color);
}

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

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

.list-items a {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.list-items a::before {
  content: "•";
  color: var(--accent-color);
}

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

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

.category-header {
  background: var(--bg-secondary);
  padding: 48px 0;
  text-align: center;
}

.category-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.category-desc {
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 24px;
}

.category-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
}

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

.stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent-color);
}

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

/* 分页 */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 48px;
}

.page-item {
  min-width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: all 0.2s;
}

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

.page-item.active {
  background: var(--accent-color);
  border-color: var(--accent-color);
  color: #fff;
}

.page-item.disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ========================================
   文章页样式
   ======================================== */

.article-header {
  padding: 48px 0 32px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 32px;
}

.article-title {
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 20px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

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

.article-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 48px;
}

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

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 40px 0 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent-color);
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 32px 0 16px;
}

.article-content p {
  margin-bottom: 20px;
}

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

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

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

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

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.9375rem;
}

.article-content th,
.article-content td {
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  text-align: left;
}

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

.article-content tr:nth-child(even) {
  background: var(--bg-secondary);
}

/* 信息框 */
.info-box {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 24px;
}

.info-box-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.info-box-list li {
  padding: 8px 0;
  font-size: 0.9375rem;
}

.info-box-list a {
  color: var(--text-secondary);
}

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

/* 参见链接 */
.see-also {
  background: var(--bg-secondary);
  border-left: 4px solid var(--accent-color);
  padding: 20px 24px;
  margin: 32px 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.see-also-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.see-also-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.see-also-list a {
  background: var(--bg-primary);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.875rem;
  color: var(--accent-color);
  border: 1px solid var(--border-color);
}

.see-also-list a:hover {
  background: var(--accent-color);
  color: #fff;
  text-decoration: none;
}

/* 参考文献 */
.references {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 2px solid var(--border-color);
}

.references-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.references-list {
  padding-left: 0;
  list-style: none;
  counter-reset: ref-counter;
}

.references-list li {
  padding: 12px 0;
  font-size: 0.875rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
  counter-increment: ref-counter;
}

.references-list li::before {
  content: "[" counter(ref-counter) "] ";
  color: var(--accent-color);
  font-weight: 500;
}

/* 侧边栏 */
.sidebar {
  position: sticky;
  top: 88px;
  height: fit-content;
}

.sidebar-section {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 24px;
}

.sidebar-title {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent-color);
}

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

.toc-nav li {
  padding: 8px 0;
  border-bottom: 1px solid var(--border-color);
}

.toc-nav li:last-child {
  border-bottom: none;
}

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

.toc-nav 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: 64px 24px;
}

.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: 1.75rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.error-desc {
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 400px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: all 0.2s;
}

.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(--border-color);
  text-decoration: none;
  color: var(--text-primary);
}

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

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

  .sidebar {
    position: static;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

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

@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 {
    order: 2;
  }

  .search-input {
    width: 180px;
  }

  .hero {
    padding: 40px 0;
  }

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

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

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

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

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

  .category-stats {
    gap: 24px;
  }

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

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

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

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

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

  .nav {
    gap: 16px;
    font-size: 0.875rem;
  }

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

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

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