/* ===================================
   Blog Layout
   =================================== */
.blog-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.blog-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: var(--space-3xl);
  align-items: start;
  padding: var(--space-2xl) 0;
}

/* ===================================
   Blog Sidebar
   =================================== */
.blog-sidebar {
  position: sticky;
  top: 100px;
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  height: fit-content;
}

.sidebar-card {
  background: var(--color-surface);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.sidebar-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: var(--space-lg);
  color: var(--color-text-primary);
}

/* Search Input */
.search-wrapper {
  position: relative;
}

.search-input-container {
  position: relative;
}

.search-icon {
  position: absolute;
  left: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-tertiary);
  z-index: 2;
}

.search-input {
  width: 100%;
  padding: var(--space-md) var(--space-md) var(--space-md) 2.5rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  transition: all var(--transition-base);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

.search-suggestions {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-top: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  max-height: 300px;
  overflow-y: auto;
}

.suggestion-item {
  padding: var(--space-md);
  cursor: pointer;
  transition: background-color var(--transition-fast);
  border-bottom: 1px solid var(--color-border);
}

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

.suggestion-item:hover {
  background-color: var(--color-background);
}

.suggestion-title {
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: var(--color-text-primary);
}

.suggestion-meta {
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
}

/* Category List */
.category-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.category-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  font-weight: 500;
}

.category-link:hover,
.category-link.active {
  background: var(--color-primary);
  color: white;
  transform: translateX(4px);
}

/* ===================================
   Articles Grid
   =================================== */
.blog-main {
  min-height: 60vh;
}

/* Search Section */
.search-section {
  margin-bottom: var(--space-xl);
  margin-top: var(--space-3xl);
  padding: var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.search-section .search-wrapper {
  max-width: 500px;
  margin: 0 auto;
}

.search-section .search-input {
  font-size: 1rem;
  padding: var(--space-lg) var(--space-lg) var(--space-lg) 3rem;
}

.search-section .search-icon {
  width: 20px;
  height: 20px;
  left: var(--space-lg);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-3xl);
}

.article-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
  opacity: 0;
  transform: translateY(20px);
  display: flex;
  flex-direction: column;
}

.article-card.in-view {
  opacity: 1;
  transform: translateY(0);
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.article-image {
  position: relative;
  height: 200px;
  overflow: hidden;
  background: var(--color-background);
}

.article-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.article-card:hover .article-image img {
  transform: scale(1.05);
}

.article-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent, rgba(0, 0, 0, 0.1));
}

.article-content {
  padding: var(--space-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.article-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
  flex-wrap: wrap;
}

.article-category {
  background: rgba(0, 102, 255, 0.1);
  color: var(--color-primary);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.article-date {
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
}

.article-title {
  margin-bottom: var(--space-md);
}

.article-title a {
  color: var(--color-text-primary);
  text-decoration: none;
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color var(--transition-base);
}

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

.article-excerpt {
  flex: 1;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-lg);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
}

.article-stats {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
}

.article-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  transition: all var(--transition-base);
}

.article-link:hover {
  gap: 0.75rem;
}

/* ===================================
   Pagination
   =================================== */
.pagination-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  margin-top: var(--space-3xl);
}

.pagination-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: var(--space-md) var(--space-lg);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  font-weight: 500;
  transition: all var(--transition-base);
}

.pagination-btn:hover {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.pagination-numbers {
  display: flex;
  gap: 0.5rem;
}

.pagination-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--color-surface);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  font-weight: 500;
  transition: all var(--transition-base);
}

.pagination-number:hover {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.pagination-number.active {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.pagination-ellipsis {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--color-text-tertiary);
}

/* ===================================
   Empty & Error States
   =================================== */
.error-state,
.empty-state {
  text-align: center;
  padding: var(--space-3xl);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.error-icon,
.empty-icon {
  font-size: 4rem;
  margin-bottom: var(--space-lg);
}

.error-state h3,
.empty-state h3 {
  font-size: 1.5rem;
  margin-bottom: var(--space-md);
  color: var(--color-text-primary);
}

.error-state p,
.empty-state p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

/* ===================================
   Article Detail Styles
   =================================== */
.article-detail-header {
  padding: 6rem 0 2rem;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.article-detail-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* Breadcrumbs */
.breadcrumbs {
  margin-bottom: var(--space-lg);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0;
  margin: 0;
  list-style: none;
  flex-wrap: wrap;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  font-size: 0.875rem;
}

.breadcrumb-item:not(:last-child)::after {
  content: '/';
  color: var(--color-text-secondary);
  margin-left: 0.5rem;
  margin-right: 0.5rem;
  font-weight: 500;
}

.breadcrumb-link {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
  padding: 0.25rem 0;
}

.breadcrumb-link:hover {
  color: var(--color-primary);
}

.breadcrumb-link svg {
  flex-shrink: 0;
  opacity: 0.7;
}

.breadcrumb-current {
  color: var(--color-text-primary);
  font-weight: 600;
}

.breadcrumb-current span {
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  display: block;
}

@media (max-width: 768px) {
  .breadcrumb-current span {
    max-width: 150px;
  }

  .breadcrumb-list {
    gap: 0.25rem;
  }

  .breadcrumb-item:not(:last-child)::after {
    margin-left: 0.25rem;
    margin-right: 0.25rem;
  }
}

.article-detail-meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.detail-date,
.detail-views {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

.article-detail-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-lg);
  color: var(--color-text-primary);
}

.article-detail-description {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-xl);
}

.article-detail-image {
  margin-bottom: var(--space-xl);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  aspect-ratio: 16 / 9;
}

.article-detail-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-detail-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--space-3xl);
  align-items: start;
}

/* ===================================
   Article Content
   =================================== */
.article-detail-content {
  background: var(--color-surface);
  padding: var(--space-2xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.article-prose {
  line-height: 1.8;
  max-width: none;
}

.article-prose h1,
.article-prose h2,
.article-prose h3,
.article-prose h4 {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--color-text-primary);
  margin: 2rem 0 1rem 0;
  line-height: 1.3;
}

.article-prose h1 {
  font-size: 2rem;
}

.article-prose h2 {
  font-size: 1.75rem;
}

.article-prose h3 {
  font-size: 1.5rem;
}

.article-prose h4 {
  font-size: 1.25rem;
}

.article-prose p {
  margin-bottom: 1.5rem;
}

.article-prose a {
  color: var(--color-primary);
  text-decoration: underline;
  transition: color var(--transition-base);
}

.article-prose a:hover {
  color: var(--color-primary-dark);
  text-decoration: none;
}

.article-prose ul,
.article-prose ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.article-prose li {
  margin-bottom: 0.5rem;
}

.article-prose blockquote {
  border-left: 4px solid var(--color-primary);
  padding-left: 1.5rem;
  margin: 2rem 0;
  font-style: italic;
}

.article-prose img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: 1.5rem 0;
}

.article-prose code {
  background: var(--color-background);
  padding: 0.2rem 0.4rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

.article-prose pre {
  background: var(--color-background);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 1.5rem 0;
}

.article-prose pre code {
  background: none;
  padding: 0;
}

/* ===================================
   Article Footer
   =================================== */
.article-detail-footer {
  margin-top: var(--space-3xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
}

.article-tags {
  margin-bottom: var(--space-xl);
}

.tags-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
  color: var(--color-text-primary);
}

.tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  background: var(--color-background);
  color: var(--color-text-secondary);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--transition-base);
}

.tag:hover {
  background: var(--color-primary);
  color: white;
  transform: translateY(-2px);
}

.article-share {
  text-align: center;
}

.share-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: var(--space-lg);
  color: var(--color-text-primary);
}

.share-buttons {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
}

.share-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--color-background);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
}

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

.share-twitter:hover {
  background: #1da1f2;
  color: white;
}

.share-facebook:hover {
  background: #1877f2;
  color: white;
}

.share-linkedin:hover {
  background: #0077b5;
  color: white;
}

.share-copy:hover {
  background: var(--color-success);
  color: white;
}

/* ===================================
   Detail Sidebar
   =================================== */
.article-detail-sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.sidebar-sticky {
  position: sticky;
  top: 100px;
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.sidebar-card-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: var(--space-lg);
  color: var(--color-text-primary);
}

.toc-nav {
  max-height: 400px;
  overflow-y: auto;
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc-item {
  margin-bottom: 0.5rem;
}

.toc-h1 {
  margin-left: 0;
}

.toc-h2 {
  margin-left: 1rem;
}

.toc-h3 {
  margin-left: 2rem;
}

.toc-link {
  display: block;
  padding: 0.5rem 0;
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
}

.toc-link:hover {
  color: var(--color-primary);
  padding-left: 0.5rem;
  background: rgba(0, 102, 255, 0.05);
}

.sidebar-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  transition: all var(--transition-base);
}

.sidebar-link:hover {
  gap: 0.75rem;
}

/* ===================================
   Reading Progress
   =================================== */
.reading-progress {
  position: fixed;
  top: 69px;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  z-index: 999;
  transition: width 0.1s ease;
}

/* ===================================
   Related Articles
   =================================== */
.related-articles {
  padding: var(--space-3xl) 0;
  background: var(--color-background);
  border-top: 1px solid var(--color-border);
}

.related-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--space-2xl);
  color: var(--color-text-primary);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.related-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
  opacity: 0;
  transform: translateY(20px);
}

.related-card.in-view {
  opacity: 1;
  transform: translateY(0);
}

.related-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.related-image {
  height: 160px;
  overflow: hidden;
  background: var(--color-background);
}

.related-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.related-card:hover .related-image img {
  transform: scale(1.05);
}

.related-content {
  padding: var(--space-lg);
}

.related-category {
  background: rgba(0, 102, 255, 0.1);
  color: var(--color-primary);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: var(--space-md);
  display: inline-block;
}

.related-card-title {
  margin-bottom: var(--space-md);
}

.related-card-title a {
  color: var(--color-text-primary);
  text-decoration: none;
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.4;
  transition: color var(--transition-base);
}

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

.related-excerpt {
  color: var(--color-text-secondary);
  line-height: 1.6;
  font-size: 0.875rem;
}

/* ===================================
   Responsive Blog Styles
   =================================== */
@media (max-width: 1024px) {
  .blog-layout {
    grid-template-columns: 250px 1fr;
    gap: var(--space-xl);
  }

  .article-detail-layout {
    grid-template-columns: 1fr 250px;
    gap: var(--space-xl);
  }
}

@media (max-width: 768px) {
  .blog-layout {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .blog-sidebar {
    position: static;
    order: 2;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
  }

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

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

  .article-detail-sidebar {
    order: -1;
    margin-bottom: var(--space-xl);
  }

  .sidebar-sticky {
    position: static;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-lg);
  }

  .pagination-nav {
    flex-direction: column;
    gap: var(--space-md);
  }

  .pagination-numbers {
    order: -1;
  }
}

@media (max-width: 480px) {
  .article-detail-content {
    padding: 0;
    background: transparent;
    border-radius: 0;
    box-shadow: none;
  }

  .share-buttons {
    gap: var(--space-sm);
  }

  .share-btn {
    width: 44px;
    height: 44px;
  }
}