/* ============================================================
   blog.css - Blog / Article Styles
   Styles for blog listing, article detail pages, tags,
   search, and pagination.
   ============================================================ */


/* ----------------------------------------------------------
   1. Blog Page Header
   ---------------------------------------------------------- */
.blog-header {
  margin-bottom: var(--space-10);
}

.blog-header__title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  margin-bottom: var(--space-3);
  line-height: var(--line-height-tight);
}

.blog-header__desc {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 560px;
  line-height: var(--line-height-relaxed);
}


/* ----------------------------------------------------------
   2. Blog Search Box
   ---------------------------------------------------------- */
.blog-search {
  position: relative;
  max-width: 480px;
  margin-bottom: var(--space-8);
}

.blog-search__input {
  width: 100%;
  height: 48px;
  padding: 0 var(--space-5) 0 48px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background-color: var(--color-surface);
  color: var(--color-text);
  font-size: var(--font-size-base);
  transition: all var(--transition-fast);
  outline: none;
}

.blog-search__input::placeholder {
  color: var(--color-text-tertiary);
}

.blog-search__input:focus {
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.blog-search__icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  color: var(--color-text-tertiary);
  pointer-events: none;
}

.blog-search__clear {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  color: var(--color-text-tertiary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.blog-search__clear:hover {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text);
}

.blog-search__clear svg {
  width: 16px;
  height: 16px;
}


/* ----------------------------------------------------------
   3. Blog Tags Filter
   ---------------------------------------------------------- */
.blog-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
}

.blog-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  background-color: var(--color-bg-tertiary);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.blog-tag:hover {
  background-color: var(--color-border);
  color: var(--color-text);
}

.blog-tag--active {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.blog-tag--active:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.blog-tag__count {
  font-size: var(--font-size-xs);
  opacity: 0.7;
}


/* ----------------------------------------------------------
   4. Article List (Card Grid)
   ---------------------------------------------------------- */
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

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

.article-grid--featured .article-card:first-child {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
}

.article-grid--featured .article-card:first-child .article-card__image {
  height: 100%;
  min-height: 320px;
}

.article-grid--featured .article-card:first-child .article-card__body {
  display: flex;
  flex-direction: column;
  justify-content: center;
}


/* ----------------------------------------------------------
   5. Article Card
   ---------------------------------------------------------- */
.article-card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-base);
  text-decoration: none;
  color: inherit;
}

.article-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

/* Card Image */
.article-card__image {
  position: relative;
  width: 100%;
  height: 200px;
  background-color: var(--color-bg-tertiary);
  overflow: hidden;
}

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

.article-card:hover .article-card__image img {
  transform: scale(1.03);
}

.article-card__image-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  color: var(--color-text-tertiary);
}

.article-card__image-placeholder svg {
  width: 40px;
  height: 40px;
}

/* Card Body */
.article-card__body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: var(--space-5) var(--space-6) var(--space-6);
}

/* Card Meta */
.article-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

.article-card__date {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.article-card__date svg {
  width: 14px;
  height: 14px;
}

.article-card__read-time {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.article-card__read-time svg {
  width: 14px;
  height: 14px;
}

/* Card Title */
.article-card__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-3);
  line-height: var(--line-height-tight);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card:hover .article-card__title {
  color: var(--color-primary);
}

/* Card Excerpt */
.article-card__excerpt {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: var(--space-4);
}

/* Card Footer */
.article-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border-light);
}

.article-card__author {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.article-card__author-avatar {
  width: 24px;
  height: 24px;
  border-radius: var(--radius-full);
  background-color: var(--color-bg-tertiary);
  overflow: hidden;
}

.article-card__author-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-card__tags {
  display: flex;
  gap: var(--space-1);
}

.article-card__tag {
  font-size: var(--font-size-xs);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-tertiary);
  font-weight: var(--font-weight-medium);
}


/* ----------------------------------------------------------
   6. Article Detail Page
   ---------------------------------------------------------- */
.article-detail {
  max-width: var(--content-max-width);
  margin: 0 auto;
}

/* Article Hero */
.article-hero {
  margin-bottom: var(--space-10);
}

.article-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.article-hero__title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-5);
}

.article-hero__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.article-hero__author {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.article-hero__author-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background-color: var(--color-bg-tertiary);
  overflow: hidden;
}

.article-hero__author-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-hero__author-info {
  display: flex;
  flex-direction: column;
}

.article-hero__author-name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

.article-hero__author-role {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

.article-hero__stats {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
}

.article-hero__stat {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.article-hero__stat svg {
  width: 16px;
  height: 16px;
}

/* Article Cover Image */
.article-cover {
  width: 100%;
  border-radius: var(--radius-xl);
  overflow: hidden;
  margin-bottom: var(--space-10);
  background-color: var(--color-bg-tertiary);
}

.article-cover img {
  width: 100%;
  height: auto;
  display: block;
}


/* ----------------------------------------------------------
   7. Article Content (Prose Typography)
   ---------------------------------------------------------- */
.article-content {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  color: var(--color-text);
}

.article-content > * + * {
  margin-top: var(--space-6);
}

.article-content h2 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  margin-top: var(--space-10);
  margin-bottom: var(--space-4);
  line-height: var(--line-height-tight);
}

.article-content h3 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
  line-height: var(--line-height-tight);
}

.article-content h4 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
}

.article-content p {
  margin-bottom: var(--space-5);
  color: var(--color-text);
}

.article-content a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: rgba(59, 130, 246, 0.3);
  transition: all var(--transition-fast);
}

.article-content a:hover {
  text-decoration-color: var(--color-primary);
}

.article-content strong {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

.article-content em {
  font-style: italic;
}

.article-content ul,
.article-content ol {
  padding-left: var(--space-8);
  margin-bottom: var(--space-5);
}

.article-content li {
  margin-bottom: var(--space-2);
}

.article-content li::marker {
  color: var(--color-primary);
}

.article-content blockquote {
  padding: var(--space-5) var(--space-6);
  margin: var(--space-6) 0;
  border-left: 4px solid var(--color-primary);
  background-color: var(--color-bg-secondary);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  font-style: italic;
  color: var(--color-text-secondary);
}

.article-content blockquote p {
  margin-bottom: 0;
  color: inherit;
}

.article-content code {
  padding: 2px 6px;
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-sm);
  font-family: var(--font-family-mono);
  font-size: 0.875em;
  color: var(--color-primary);
}

.article-content pre {
  padding: var(--space-6);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow-x: auto;
  margin: var(--space-6) 0;
}

.article-content pre code {
  padding: 0;
  background: none;
  border-radius: 0;
  font-size: var(--font-size-sm);
  color: var(--color-text);
  line-height: var(--line-height-relaxed);
}

.article-content img {
  border-radius: var(--radius-lg);
  margin: var(--space-6) 0;
}

.article-content hr {
  border: none;
  height: 1px;
  background-color: var(--color-border);
  margin: var(--space-10) 0;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-6) 0;
  font-size: var(--font-size-base);
}

.article-content th,
.article-content td {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

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

.article-content td {
  color: var(--color-text-secondary);
}

.article-content tr:hover td {
  background-color: var(--color-bg-secondary);
}

/* Inline image with caption */
.article-content .image-with-caption {
  margin: var(--space-8) 0;
}

.article-content .image-caption {
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  margin-top: var(--space-3);
  font-style: italic;
}


/* ----------------------------------------------------------
   8. Article Footer / Share
   ---------------------------------------------------------- */
.article-footer {
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
}

.article-footer__share {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.article-footer__share-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

.article-footer__share-buttons {
  display: flex;
  gap: var(--space-2);
}

.article-footer__share-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-lg);
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.article-footer__share-btn:hover {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
}

.article-footer__share-btn svg {
  width: 18px;
  height: 18px;
}

/* Related Articles */
.article-related {
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
}

.article-related__title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  margin-bottom: var(--space-6);
}

.article-related__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}


/* ----------------------------------------------------------
   9. Pagination
   ---------------------------------------------------------- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
}

.pagination__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 var(--space-3);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pagination__btn:hover {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text);
  border-color: var(--color-border);
}

.pagination__btn--active {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
}

.pagination__btn--active:hover {
  background-color: var(--color-primary-hover);
  color: var(--color-text-inverse);
  border-color: var(--color-primary-hover);
}

.pagination__btn--disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

.pagination__btn svg {
  width: 16px;
  height: 16px;
}

.pagination__ellipsis {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
}

/* Pagination info text */
.pagination__info {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-4);
  text-align: center;
}


/* ----------------------------------------------------------
   10. Article Sidebar (TOC / Author Box)
   ---------------------------------------------------------- */
.blog-sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

/* Table of Contents */
.blog-toc {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  position: sticky;
  top: calc(var(--nav-height) + var(--space-8));
}

.blog-toc__title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
}

.blog-toc__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.blog-toc__item {
  display: block;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  text-decoration: none;
  line-height: var(--line-height-normal);
}

.blog-toc__item:hover {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text);
}

.blog-toc__item--active {
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
  background-color: var(--color-primary-light);
}

.blog-toc__item--indent {
  padding-left: var(--space-6);
}

/* Author Box */
.blog-author-box {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
}

.blog-author-box__avatar {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background-color: var(--color-bg-tertiary);
  overflow: hidden;
  flex-shrink: 0;
}

.blog-author-box__avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.blog-author-box__info {
  flex: 1;
}

.blog-author-box__name {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.blog-author-box__bio {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-normal);
}


/* ----------------------------------------------------------
   11. Article List Layout (with sidebar)
   ---------------------------------------------------------- */
.blog-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: var(--space-8);
  align-items: start;
}

.blog-layout__main {
  min-width: 0;
}


/* ----------------------------------------------------------
   12. Responsive - Blog
   ---------------------------------------------------------- */
@media (max-width: 1024px) {
  .article-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
  }

  .article-grid--featured .article-card:first-child {
    grid-template-columns: 1fr;
  }

  .article-grid--featured .article-card:first-child .article-card__image {
    min-height: 240px;
  }

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

  .blog-toc {
    position: static;
  }

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

  .article-hero__title {
    font-size: var(--font-size-3xl);
  }
}

@media (max-width: 640px) {
  .blog-header__title {
    font-size: var(--font-size-2xl);
  }

  .article-grid {
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }

  .article-grid--2col {
    grid-template-columns: 1fr;
  }

  .article-grid--featured .article-card:first-child {
    grid-column: 1;
  }

  .article-card__image {
    height: 180px;
  }

  .article-card__body {
    padding: var(--space-4) var(--space-5) var(--space-5);
  }

  .article-hero__title {
    font-size: var(--font-size-2xl);
  }

  .article-hero__meta {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
  }

  .article-content {
    font-size: var(--font-size-base);
  }

  .article-content h2 {
    font-size: var(--font-size-xl);
  }

  .article-content h3 {
    font-size: var(--font-size-lg);
  }

  .article-content pre {
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-xs);
  }

  .article-footer__share {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
  }

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

  .pagination {
    gap: var(--space-1);
  }

  .pagination__btn {
    min-width: 36px;
    height: 36px;
    font-size: var(--font-size-xs);
  }

  .blog-tags {
    gap: var(--space-1);
  }

  .blog-tag {
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-xs);
  }

  .blog-search__input {
    height: 44px;
    font-size: var(--font-size-sm);
  }
}