/**
 * 宠物玩具 - 资源导航风格样式
 * 主题色: #2196f3 (蓝色)
 */

/* ==================== CSS 变量 ==================== */
:root {
  --accent-color: #2196f3;
  --accent-dark: #1976d2;
  --accent-light: #64b5f6;
  --text-primary: #333;
  --text-secondary: #666;
  --text-muted: #999;
  --bg-primary: #fff;
  --bg-secondary: #f5f7fa;
  --bg-card: #fff;
  --border-color: #e8ecf1;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-hover: 0 4px 16px rgba(0,0,0,0.12);
  --radius: 8px;
  --radius-lg: 12px;
  --max-width: 1200px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-secondary);
}

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

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

ul {
  list-style: none;
}

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

/* ==================== 布局容器 ==================== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ==================== 头部 ==================== */
.header {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  font-size: 22px;
  font-weight: 700;
  color: var(--accent-color);
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo::before {
  content: "🐾";
  font-size: 24px;
}

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

.nav a {
  color: var(--text-secondary);
  font-weight: 500;
  padding: 8px 0;
  position: relative;
}

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

.nav a.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-color);
  border-radius: 2px;
}

/* ==================== 搜索框 ==================== */
.search-box {
  position: relative;
  flex: 1;
  max-width: 400px;
}

.search-box input {
  width: 100%;
  padding: 12px 44px 12px 16px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  font-size: 14px;
  transition: all 0.3s ease;
  background: var(--bg-secondary);
}

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

.search-box button {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 16px;
}

/* ==================== 面包屑 ==================== */
.breadcrumb {
  background: var(--bg-primary);
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
}

.breadcrumb ol {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
}

.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-muted);
}

/* ==================== Hero 区域 ==================== */
.hero {
  background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-dark) 100%);
  color: #fff;
  padding: 60px 0;
  text-align: center;
}

.hero h1 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 12px;
}

.hero p {
  font-size: 16px;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto 32px;
}

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

.hero .search-box input {
  background: rgba(255,255,255,0.95);
  border-color: transparent;
  padding: 16px 56px 16px 20px;
  font-size: 16px;
}

.hero .search-box button {
  right: 16px;
  color: var(--accent-color);
  font-size: 18px;
}

/* ==================== 统计信息 ==================== */
.stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-top: 32px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.2);
}

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

.stat-number {
  font-size: 32px;
  font-weight: 700;
  display: block;
}

.stat-label {
  font-size: 13px;
  opacity: 0.8;
}

/* ==================== 分类筛选 ==================== */
.category-filter {
  padding: 40px 0;
}

.section-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 24px;
  text-align: center;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
}

.category-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  transition: all 0.3s ease;
  cursor: pointer;
}

.category-card:hover {
  border-color: var(--accent-color);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

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

.category-card .icon {
  font-size: 32px;
  margin-bottom: 8px;
  display: block;
}

.category-card h3 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
}

.category-card span {
  font-size: 12px;
  opacity: 0.7;
}

.category-card.active span {
  opacity: 0.9;
}

/* ==================== 子分类 ==================== */
.sub-categories {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.sub-category {
  padding: 8px 16px;
  background: var(--bg-secondary);
  border-radius: 20px;
  font-size: 13px;
  color: var(--text-secondary);
  transition: all 0.3s ease;
}

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

/* ==================== 链接卡片 ==================== */
.links-section {
  padding: 0 0 40px;
}

.link-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
  transition: all 0.3s ease;
}

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

.link-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.link-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.link-title::before {
  content: "🔗";
  font-size: 14px;
}

.link-url {
  font-size: 12px;
  color: var(--text-muted);
  display: block;
  margin-top: 4px;
}

.link-desc {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 12px;
}

.link-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 12px;
  color: var(--text-muted);
}

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

.verified {
  color: #4caf50;
}

.rating {
  color: #ff9800;
}

/* ==================== 文章卡片 ==================== */
.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 16px;
}

.article-header {
  margin-bottom: 16px;
}

.article-title {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 12px;
  line-height: 1.4;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
}

.article-content {
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 15px;
}

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

.article-content h2 {
  font-size: 20px;
  font-weight: 600;
  margin: 32px 0 16px;
  color: var(--text-primary);
}

.article-content h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 24px 0 12px;
  color: var(--text-primary);
}

.article-content ul,
.article-content ol {
  margin: 16px 0;
  padding-left: 24px;
}

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

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

/* ==================== 标签 ==================== */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.tag {
  padding: 6px 12px;
  background: var(--bg-secondary);
  border-radius: 4px;
  font-size: 12px;
  color: var(--text-secondary);
}

.tag::before {
  content: "#";
  margin-right: 2px;
}

/* ==================== 文章列表 ==================== */
.article-list {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 20px;
}

.article-list h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

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

.article-list li a {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
  font-size: 14px;
  transition: color 0.3s ease;
}

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

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

/* ==================== 三栏布局 ==================== */
.three-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  padding: 40px 0;
}

/* ==================== 分类页头部 ==================== */
.category-header {
  background: var(--bg-primary);
  padding: 40px 0;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}

.category-header h1 {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 8px;
}

.category-header p {
  color: var(--text-secondary);
}

/* ==================== 分页 ==================== */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  padding: 32px 0;
}

.pagination a,
.pagination span {
  min-width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  font-size: 14px;
  transition: all 0.3s ease;
}

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

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

.pagination .current {
  background: var(--accent-color);
  color: #fff;
}

.pagination .disabled {
  color: var(--text-muted);
  cursor: not-allowed;
}

/* ==================== 404 页面 ==================== */
.error-page {
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 60px 20px;
}

.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: 24px;
  font-weight: 600;
  margin-bottom: 12px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--accent-color);
  color: #fff;
  border-radius: var(--radius);
  font-weight: 500;
  transition: all 0.3s ease;
}

.btn:hover {
  background: var(--accent-dark);
  color: #fff;
  transform: translateY(-2px);
}

/* ==================== 页脚 ==================== */
.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  padding: 40px 0 24px;
  margin-top: 40px;
}

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

.footer-brand .logo {
  margin-bottom: 12px;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 1.7;
}

.footer-column h4 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 16px;
}

.footer-column ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-column a {
  color: var(--text-secondary);
  font-size: 13px;
}

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

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

/* ==================== 响应式设计 ==================== */
@media (max-width: 992px) {
  .three-columns {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 768px) {
  .header .container {
    flex-wrap: wrap;
  }

  .nav {
    order: 3;
    width: 100%;
    justify-content: center;
    gap: 20px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
    margin-top: 12px;
  }

  .search-box {
    max-width: none;
    flex: 1;
  }

  .hero {
    padding: 40px 0;
  }

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

  .stats {
    gap: 24px;
  }

  .stat-number {
    font-size: 24px;
  }

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

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

  .footer-content {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

@media (max-width: 480px) {
  .link-header {
    flex-direction: column;
    gap: 8px;
  }

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

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