/* 科技交流汇 - 百科风格样式 */
/* 查询关键词: 科技交流汇 www.tpbxz.cn 科技交流 经验分享平台 技术答疑社区 */

:root {
  --accent-color: #607d8b;
  --accent-light: #90a4ae;
  --accent-dark: #455a64;
  --text-primary: #333;
  --text-secondary: #666;
  --text-muted: #999;
  --bg-primary: #fff;
  --bg-secondary: #f5f7f9;
  --bg-tertiary: #e8ecef;
  --border-color: #e0e4e8;
  --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;
  --max-width: 1400px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace;
}

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  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: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 600;
  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: 18px;
}

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

.nav a {
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 500;
}

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

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 8px 16px;
  width: 280px;
}

.search-box input {
  border: none;
  background: transparent;
  outline: none;
  flex: 1;
  font-size: 14px;
  color: var(--text-primary);
}

.search-box input::placeholder {
  color: var(--text-muted);
}

.search-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 16px;
}

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

/* ===== Breadcrumb ===== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
  font-size: 14px;
  color: var(--text-muted);
}

.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);
}

/* ===== Content Wrapper ===== */
.content-wrapper {
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 40px;
}

/* ===== Hero Section ===== */
.hero {
  background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-dark) 100%);
  border-radius: var(--radius-md);
  padding: 60px 48px;
  color: #fff;
  margin-bottom: 40px;
}

.hero-title {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 16px;
}

.hero-desc {
  font-size: 18px;
  opacity: 0.9;
  max-width: 600px;
  margin-bottom: 32px;
}

.hero-stats {
  display: flex;
  gap: 48px;
}

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

.hero-stat-value {
  font-size: 32px;
  font-weight: 700;
}

.hero-stat-label {
  font-size: 14px;
  opacity: 0.8;
}

/* ===== Featured Grid ===== */
.featured-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.featured-card {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 24px;
  border-left: 4px solid var(--accent-color);
}

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

.featured-card-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ===== Section Title ===== */
.section-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 8px;
}

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

/* ===== Article Grid ===== */
.article-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

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

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

.article-card-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 10px;
  line-height: 1.4;
}

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

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

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

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

.article-card-summary {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-tags {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.tag {
  font-size: 12px;
  padding: 4px 10px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
}

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

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

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

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

.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: flex;
  justify-content: space-between;
  align-items: center;
}

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

.col-list .views {
  font-size: 12px;
  color: var(--text-muted);
}

/* ===== Category Page ===== */
.category-header {
  text-align: center;
  padding: 40px 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 32px;
}

.category-title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 12px;
}

.category-desc {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.category-stats {
  display: flex;
  justify-content: center;
  gap: 32px;
  font-size: 14px;
  color: var(--text-muted);
}

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

/* ===== Pagination ===== */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
}

.pagination a,
.pagination span {
  min-width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text-secondary);
  background: var(--bg-secondary);
}

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

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

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

.article-title {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
}

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

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

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

.article-body {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
}

.article-content {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-primary);
}

.article-content h2 {
  font-size: 24px;
  font-weight: 600;
  margin: 32px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.article-content h3 {
  font-size: 20px;
  font-weight: 600;
  margin: 24px 0 12px;
}

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

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

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

.article-content code {
  font-family: var(--font-mono);
  font-size: 14px;
  background: var(--bg-secondary);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  color: var(--accent-dark);
}

.article-content pre {
  background: #2d3748;
  color: #e2e8f0;
  padding: 16px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: 16px;
}

.article-content pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

.article-content blockquote {
  border-left: 4px solid var(--accent-color);
  padding-left: 16px;
  margin: 16px 0;
  color: var(--text-secondary);
  font-style: italic;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 16px;
}

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

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

/* ===== Sidebar ===== */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-box {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 20px;
}

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

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

.info-list li {
  padding: 8px 0;
  font-size: 14px;
  color: var(--text-secondary);
  display: flex;
  justify-content: space-between;
}

.info-list li strong {
  color: var(--text-primary);
  font-weight: 500;
}

.cross-ref-list {
  list-style: none;
}

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

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

.cross-ref-list a {
  font-size: 14px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.cross-ref-list a::before {
  content: '→';
  color: var(--accent-color);
}

/* ===== See Also & References ===== */
.see-also,
.references {
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
}

.see-also-title,
.references-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 16px;
}

.see-also-list,
.ref-list {
  list-style: none;
}

.see-also-list li,
.ref-list li {
  padding: 10px 0;
  font-size: 15px;
}

.see-also-list a {
  color: var(--accent-color);
}

.ref-list li {
  display: flex;
  gap: 12px;
  color: var(--text-secondary);
}

.ref-num {
  color: var(--accent-color);
  font-weight: 500;
  min-width: 24px;
}

/* ===== 404 Page ===== */
.error-page {
  text-align: center;
  padding: 80px 40px;
}

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

.error-title {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 16px;
}

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

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 500;
  transition: all 0.2s;
}

.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);
}

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

/* ===== Footer ===== */
.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  margin-top: 60px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 24px;
}

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

.footer-brand {
  max-width: 300px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}

.footer-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

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

.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);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--text-muted);
}

.footer-bottom a {
  color: var(--text-muted);
}

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

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

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

@media (max-width: 768px) {
  .header-inner {
    flex-wrap: wrap;
    height: auto;
    padding: 12px 16px;
    gap: 12px;
  }

  .nav {
    order: 3;
    width: 100%;
    gap: 20px;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .search-box {
    width: auto;
    flex: 1;
  }

  .main {
    padding: 16px;
  }

  .content-wrapper {
    padding: 24px;
  }

  .hero {
    padding: 40px 24px;
  }

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

  .hero-stats {
    gap: 24px;
  }

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

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

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

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

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

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

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

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

@media (max-width: 480px) {
  .hero-stats {
    flex-direction: column;
    gap: 16px;
  }

  .article-meta {
    flex-direction: column;
    gap: 8px;
  }

  .pagination {
    flex-wrap: wrap;
  }
}