/* ============================================================
   CourseMatch – Blog Detail Page Styles
   ============================================================ */

/* ============================================================
   READING PROGRESS BAR
   ============================================================ */

.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  z-index: 1100;
  transition: width .1s linear;
  border-radius: 0 2px 2px 0;
}

/* ============================================================
   SHARED CONTAINER
   ============================================================ */

.article-detail-container {
  max-width: 1100px;
  margin-inline: auto;
  padding-inline: 1.5rem;
}

/* ============================================================
   HEADER
   ============================================================ */

.article-detail-header {
  background: var(--white);
  padding: 2.5rem 0 2rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0;
}

/* --- Breadcrumbs --- */
.breadcrumbs { margin-bottom: 1.5rem; }

.breadcrumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .35rem;
  list-style: none;
  font-size: .8125rem;
  color: var(--text-3);
}

.breadcrumb-item + .breadcrumb-item::before {
  content: '/';
  color: var(--border);
  margin-right: .35rem;
}

.breadcrumb-link {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  color: var(--text-3);
  text-decoration: none;
  transition: color var(--ease);
}

.breadcrumb-link:hover { color: var(--primary); }
.breadcrumb-link:focus { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 2px; }

.breadcrumb-current span {
  color: var(--text-2);
  font-weight: 500;
  /* truncate long titles */
  max-width: 260px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: inline-block;
  vertical-align: middle;
}

/* --- Meta bar --- */
.article-detail-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .75rem 1rem;
  padding: .75rem 1.25rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: .875rem;
  color: var(--text-2);
  margin-bottom: 1.5rem;
}

.detail-date,
.detail-author,
.detail-views {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  color: var(--text-2);
}

.detail-date svg,
.detail-author svg,
.detail-views svg {
  flex-shrink: 0;
  color: var(--text-3);
}

.detail-separator { color: var(--border); font-size: 1rem; }

.author-link {
  color: var(--primary);
  font-weight: 600;
  text-decoration: none;
  transition: color var(--ease);
}

.author-link:hover { color: var(--primary-dark); text-decoration: underline; }
.author-link:focus { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 2px; }

/* --- Title & Description --- */
.article-detail-title {
  font-size: clamp(1.625rem, 4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -.4px;
  color: var(--text-1);
  margin-bottom: 1rem;
}

.article-detail-description {
  font-size: 1.0625rem;
  color: var(--text-2);
  line-height: 1.75;
  max-width: 720px;
  margin-bottom: 1.5rem;
}

/* --- Hero image --- */
.article-detail-header img {
  width: 100%;
  max-height: 480px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  margin-top: 1rem;
  display: block;
}

/* ============================================================
   CONTENT LAYOUT (prose + sidebar)
   ============================================================ */

.article-detail-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 2.5rem;
  align-items: start;
  padding-top: 2rem;
  padding-bottom: 3rem;
}

/* ============================================================
   PROSE
   ============================================================ */

.article-prose {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--text-1);
  max-width: 72ch;
}

.article-prose h2,
.article-prose h3,
.article-prose h4,
.article-prose h5,
.article-prose h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-1);
  margin-top: 2rem;
  margin-bottom: .75rem;
  scroll-margin-top: calc(var(--nav-h) + 1rem);
}

.article-prose h2 { font-size: 1.5rem; letter-spacing: -.2px; }
.article-prose h3 { font-size: 1.25rem; }
.article-prose h4 { font-size: 1.0625rem; }

.article-prose p { margin-bottom: 1.25rem; }

.article-prose a {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--ease);
}

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

.article-prose ul,
.article-prose ol {
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}

.article-prose li { margin-bottom: .4rem; }

.article-prose blockquote {
  border-left: 4px solid var(--primary);
  padding: .75rem 1.25rem;
  margin: 1.5rem 0;
  background: var(--primary-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--text-2);
}

.article-prose blockquote p { margin-bottom: 0; }

.article-prose pre {
  background: #1e293b;
  color: #e2e8f0;
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-size: .875rem;
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

.article-prose code {
  font-family: 'Cascadia Code', 'Fira Code', 'Courier New', monospace;
  font-size: .9em;
}

.article-prose :not(pre) > code {
  background: #f1f5f9;
  color: #be185d;
  padding: .15em .4em;
  border-radius: 4px;
}

.article-prose img {
  max-width: 100%;
  border-radius: var(--radius-md);
  margin: 1.25rem 0;
}

.article-prose table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.25rem;
  font-size: .9375rem;
}

.article-prose th,
.article-prose td {
  padding: .65rem 1rem;
  border: 1px solid var(--border);
  text-align: left;
}

.article-prose th {
  background: var(--bg);
  font-weight: 700;
  color: var(--text-1);
}

.article-prose tr:nth-child(even) td { background: var(--bg); }

/* ============================================================
   ARTICLE FOOTER (tags + share)
   ============================================================ */

.article-detail-footer {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

/* Tags */
.tags-title,
.share-title {
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: .75rem;
}

.tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
}

.tag,
.tag-link {
  display: inline-block;
  padding: .3rem .85rem;
  font-size: .8125rem;
  font-weight: 500;
  background: var(--bg);
  color: var(--text-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  text-decoration: none;
  transition: background var(--ease), color var(--ease), border-color var(--ease), transform .15s ease;
}

.tag-link:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: translateY(-1px);
}

.tag-link:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Share */
.share-buttons {
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--white);
  color: var(--text-2);
  cursor: pointer;
  text-decoration: none;
  transition: background var(--ease), color var(--ease), border-color var(--ease), transform .15s ease;
}

.share-btn:hover { transform: translateY(-2px); }

.share-twitter:hover  { background: #1da1f2; color: #fff; border-color: #1da1f2; }
.share-facebook:hover { background: #1877f2; color: #fff; border-color: #1877f2; }
.share-linkedin:hover { background: #0a66c2; color: #fff; border-color: #0a66c2; }
.share-copy:hover     { background: var(--primary); color: #fff; border-color: var(--primary); }

.share-btn:focus { outline: 2px solid var(--primary); outline-offset: 2px; }

/* ============================================================
   SIDEBAR
   ============================================================ */

.article-detail-sidebar {
  min-width: 0;
}

.sidebar-sticky {
  position: sticky;
  top: calc(var(--nav-h) + 1.5rem);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.sidebar-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-xs);
}

.sidebar-card-title {
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 1rem;
  padding-bottom: .75rem;
  border-bottom: 1px solid var(--border);
}

.sidebar-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .5rem;
  font-size: .875rem;
  font-weight: 600;
  color: var(--primary);
  text-decoration: none;
  transition: gap var(--ease);
}

.sidebar-link:hover { gap: .75rem; }
.sidebar-link:focus { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 2px; }

/* TOC */
.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: .1rem;
}

.toc-item { padding-left: 0; }
.toc-h3   { padding-left: 1rem; }
.toc-h4   { padding-left: 2rem; }

.toc-link {
  display: block;
  padding: .35rem .5rem;
  font-size: .8125rem;
  color: var(--text-2);
  text-decoration: none;
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  transition: color var(--ease), background var(--ease), border-color var(--ease);
  line-height: 1.45;
}

.toc-link:hover {
  color: var(--primary);
  background: var(--primary-light);
  border-left-color: var(--primary);
}

/* ============================================================
   RELATED ARTICLES
   ============================================================ */

.related-articles {
  background: var(--bg);
  border-top: 1px solid var(--border);
  padding: 3rem 0;
  margin-top: 2rem;
}

.related-title {
  font-size: 1.375rem;
  font-weight: 800;
  color: var(--text-1);
  margin-bottom: 1.5rem;
  letter-spacing: -.2px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.related-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform .22s ease, box-shadow .22s ease;
  opacity: 0;
  transform: translateY(20px);
}

.related-card.in-view {
  opacity: 1;
  transform: translateY(0);
  transition: opacity .4s ease, transform .4s ease, box-shadow .22s ease;
}

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

.related-image {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--bg);
  flex-shrink: 0;
}

.related-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .4s ease;
  display: block;
}

.related-card:hover .related-image img { transform: scale(1.04); }

.related-content {
  padding: 1rem 1.1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  flex: 1;
}

.related-category {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .05em;
  text-transform: uppercase;
  padding: .2rem .6rem;
  border-radius: var(--radius-pill);
  align-self: flex-start;
}

.related-card-title {
  font-size: .9375rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text-1);
}

.related-card-title a {
  color: inherit;
  text-decoration: none;
  transition: color var(--ease);
}

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

.related-excerpt {
  font-size: .8375rem;
  color: var(--text-2);
  line-height: 1.6;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 960px) {
  .article-detail-layout {
    grid-template-columns: 1fr;
  }

  .article-detail-sidebar { order: -1; }

  .sidebar-sticky { position: static; }

  .toc-card { display: none; } /* hide TOC on mobile – noise > value */

  .article-prose { max-width: 100%; }
}

@media (max-width: 720px) {
  .related-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 540px) {
  .article-detail-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: .6rem;
  }

  .detail-separator { display: none; }

  .article-detail-title { font-size: 1.5rem; }

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

  .share-btn { width: 40px; height: 40px; }
}