/* ===== CSS Variables ===== */
:root {
  --accent-color: #8B4513;
  --accent-light: #A0522D;
  --bg-primary: #FAF7F2;
  --bg-secondary: #FFFFFF;
  --bg-card: #FFFFFF;
  --text-primary: #2C1810;
  --text-secondary: #6B5B4F;
  --text-muted: #9B8B7F;
  --border-color: #E8E0D8;
  --shadow-sm: 0 2px 4px rgba(44, 24, 16, 0.06);
  --shadow-md: 0 4px 12px rgba(44, 24, 16, 0.1);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --max-width: 1200px;
  --header-height: 70px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

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: var(--bg-primary);
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

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

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

/* ===== Header ===== */
.header {
  background: var(--bg-secondary);
  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: 10px;
  font-size: 22px;
  font-weight: 700;
  color: var(--accent-color);
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent-color), var(--accent-light));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 18px;
}

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

.nav a {
  color: var(--text-secondary);
  font-weight: 500;
  transition: color 0.2s;
}

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

/* ===== Hero Section ===== */
.hero {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  padding: 60px 0;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}

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

.hero-desc {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

/* ===== Search Box ===== */
.search-box {
  max-width: 600px;
  margin: 0 auto 40px;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 16px 24px;
  padding-right: 56px;
  font-size: 16px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: var(--bg-secondary);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.search-input:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 4px rgba(139, 69, 19, 0.1);
}

.search-btn {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  background: var(--accent-color);
  border: none;
  border-radius: var(--radius-md);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.search-btn:hover {
  background: var(--accent-light);
}

/* ===== Category Filter ===== */
.category-filter {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 20px;
}

.category-btn {
  padding: 10px 20px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.category-btn:hover,
.category-btn.active {
  background: var(--accent-color);
  border-color: var(--accent-color);
  color: white;
}

/* ===== Section Title ===== */
.section-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-title::before {
  content: '';
  width: 4px;
  height: 24px;
  background: var(--accent-color);
  border-radius: 2px;
}

/* ===== Featured Section ===== */
.featured-section {
  padding: 48px 0;
}

/* ===== Link Card ===== */
.link-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.link-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: box-shadow 0.2s, transform 0.2s;
}

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

.link-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--accent-color), var(--accent-light));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 20px;
  flex-shrink: 0;
}

.link-content {
  flex: 1;
  min-width: 0;
}

.link-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.link-url {
  font-size: 13px;
  color: var(--accent-color);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

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

.link-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-muted);
}

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

.verified-badge {
  color: #22C55E;
}

/* ===== Statistics ===== */
.stats-bar {
  display: flex;
  justify-content: center;
  gap: 40px;
  padding: 24px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  margin-top: 32px;
}

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

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

.stat-label {
  font-size: 14px;
  color: var(--text-secondary);
}

/* ===== Article Grid ===== */
.article-section {
  padding: 48px 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}

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

.article-column h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--border-color);
}

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

.article-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  color: var(--text-secondary);
  font-size: 14px;
  transition: color 0.2s;
}

.article-item::before {
  content: '•';
  color: var(--accent-color);
  font-weight: bold;
}

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

/* ===== Breadcrumb ===== */
.breadcrumb {
  padding: 16px 0;
  background: var(--bg-secondary);
  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);
  transition: color 0.2s;
}

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

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

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

/* ===== Category Header ===== */
.category-header {
  padding: 40px 0;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  border-bottom: 1px solid var(--border-color);
}

.category-title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 8px;
}

.category-count {
  color: var(--text-secondary);
  font-size: 16px;
}

/* ===== Sub Categories ===== */
.sub-categories {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

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

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

/* ===== Pagination ===== */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 40px;
  padding: 24px 0;
}

.page-btn {
  min-width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
}

.page-btn:hover,
.page-btn.active {
  background: var(--accent-color);
  border-color: var(--accent-color);
  color: white;
}

.page-btn.prev,
.page-btn.next {
  padding: 0 16px;
}

/* ===== Article Page ===== */
.article-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 48px 20px;
}

.article-header {
  margin-bottom: 32px;
}

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

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

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

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

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

.article-content h2 {
  font-size: 24px;
  font-weight: 600;
  margin: 32px 0 16px;
  color: var(--text-primary);
}

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

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

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

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

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

/* ===== Tags ===== */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.tag {
  padding: 6px 14px;
  background: var(--bg-primary);
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--text-secondary);
  transition: all 0.2s;
}

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

/* ===== Related Links ===== */
.related-section {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 20px;
}

.related-card {
  padding: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: box-shadow 0.2s;
}

.related-card:hover {
  box-shadow: var(--shadow-md);
}

.related-card-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-primary);
}

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

/* ===== 404 Page ===== */
.error-page {
  min-height: calc(100vh - var(--header-height) - 300px);
  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: 28px;
  font-weight: 600;
  margin-bottom: 12px;
}

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

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

.btn {
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}

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

.btn-primary:hover {
  background: var(--accent-light);
}

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

.btn-secondary:hover {
  border-color: var(--accent-color);
  color: var(--accent-color);
}

/* ===== Footer ===== */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 40px 0;
  margin-top: 60px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-left {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--accent-color);
}

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

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: color 0.2s;
}

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

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

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .article-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  .header-inner {
    flex-wrap: wrap;
    height: auto;
    padding: 12px 0;
  }

  .nav {
    width: 100%;
    justify-content: center;
    margin-top: 12px;
    gap: 20px;
  }

  .hero {
    padding: 40px 0;
  }

  .hero-title {
    font-size: 26px;
  }

  .hero-desc {
    font-size: 15px;
  }

  .search-box {
    margin-bottom: 24px;
  }

  .category-filter {
    gap: 8px;
  }

  .category-btn {
    padding: 8px 14px;
    font-size: 13px;
  }

  .stats-bar {
    flex-direction: column;
    gap: 20px;
  }

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

  .link-card {
    flex-direction: column;
    gap: 12px;
  }

  .link-icon {
    width: 40px;
    height: 40px;
    font-size: 16px;
  }

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

  .sub-categories {
    gap: 8px;
  }

  .sub-category {
    padding: 6px 12px;
    font-size: 13px;
  }

  .pagination {
    flex-wrap: wrap;
  }

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

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

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

  .error-title {
    font-size: 22px;
  }

  .error-actions {
    flex-direction: column;
    width: 100%;
    padding: 0 40px;
  }

  .btn {
    width: 100%;
  }

  .footer-inner {
    flex-direction: column;
    gap: 20px;
    text-align: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}

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

  .hero-title {
    font-size: 22px;
  }

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

  .link-title {
    font-size: 16px;
  }

  .link-desc {
    font-size: 13px;
  }

  .article-content {
    font-size: 15px;
  }

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

  .article-content h3 {
    font-size: 17px;
  }
}