/* ============================================
   ARTICLE COMPONENT
   Society & AI Design System
   ============================================

   Article page styling including:
   - Article title
   - Article content typography
   - Citation widget
   - Page preview popup
   - Related posts section

   Requires: tokens.css to be loaded first
   ============================================ */

/* ==========================================
   ARTICLE TITLE
   ========================================== */
.article-title {
  font-family: var(--font-heading);
  font-size: var(--text-article-title);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text);
}

/* ==========================================
   ARTICLE CONTENT - BODY TEXT
   ========================================== */
.article-content {
  font-family: var(--font-article);
  font-size: var(--text-article-body);
  line-height: var(--leading-article);
  font-weight: var(--font-normal);
}

.article-content p {
  font-family: var(--font-article);
  font-size: var(--text-article-body);
  line-height: var(--leading-article);
  font-weight: var(--font-normal);
  margin-bottom: 1.25em;
}

.article-content li {
  font-family: var(--font-article);
  font-size: var(--text-article-body);
  line-height: var(--leading-article);
  font-weight: var(--font-normal);
  margin-bottom: 0.5em;
}

.article-content blockquote {
  font-family: var(--font-article);
  font-size: var(--text-article-body);
  line-height: var(--leading-article);
  font-weight: var(--font-normal);
}

/* ==========================================
   ARTICLE CONTENT - HEADINGS
   ========================================== */
.article-content h2 {
  font-family: var(--font-heading);
  font-size: var(--text-article-h2);
  font-weight: var(--font-semibold);
  line-height: 1.25;
  margin: 3.5rem 0 1.25rem;
  letter-spacing: -0.02em;
}

.article-content h3 {
  font-family: var(--font-heading);
  font-size: var(--text-article-h3);
  font-weight: var(--font-semibold);
  line-height: var(--leading-snug);
  margin: 2.5rem 0 1rem;
}

.article-content h4 {
  font-family: var(--font-heading);
  font-size: var(--text-article-h4);
  font-weight: var(--font-medium);
  line-height: var(--leading-snug);
  margin: 1.75rem 0 0.75rem;
}

/* References section styling - only apply when explicitly marked */
.article-content .references-section {
  border-top: var(--border-width) solid var(--color-border);
  padding-top: var(--space-6);
  margin-top: var(--space-2);
}

/* ==========================================
   CITATION WIDGET
   ========================================== */
.citation-widget {
  margin: var(--space-12) 0;
  padding: var(--space-8);
  background: var(--color-bg-subtle);
  border-left: var(--border-width-thick) solid var(--color-primary);
  border-radius: var(--radius-md);
}

.citation-title {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-black);
  margin: 0 0 var(--space-6) 0;
}

/* Citation Tabs */
.citation-tabs {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  border-bottom: 2px solid var(--color-border);
}

.citation-tab {
  background: transparent;
  border: none;
  padding: 0.75rem var(--space-6);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: var(--font-medium);
  color: var(--color-text-muted);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: all var(--transition-base);
  position: relative;
  bottom: -2px;
}

.citation-tab:hover {
  color: var(--color-primary);
}

.citation-tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* Citation Content */
.citation-content {
  position: relative;
}

.citation-text {
  display: none;
}

.citation-text.active {
  display: block;
  animation: fadeIn var(--transition-slow);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.citation-text p {
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: var(--leading-relaxed);
  color: var(--color-text);
  margin: 0 0 var(--space-4) 0;
  padding: var(--space-4);
  background: var(--color-white);
  border-radius: var(--radius-md);
  border: var(--border-width) solid var(--color-border);
}

/* Copy Button */
.copy-btn {
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: var(--font-medium);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
}

.copy-btn:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
}

.copy-btn:active {
  transform: translateY(0);
}

.copy-btn.copied {
  background: var(--color-success);
}

/* Citation Links */
.citation-link {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: none;
  transition: all var(--transition-base);
  cursor: pointer;
}

.citation-link:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

/* ==========================================
   PAGE PREVIEW POPUP (Obsidian-style)
   ========================================== */
.page-preview-popup {
  position: absolute;
  width: 450px;
  max-width: 90vw;
  background: var(--color-white);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg), var(--shadow-md);
  display: none;
  opacity: 0;
  transition: opacity var(--transition-base);
  z-index: var(--z-popover);
  overflow: hidden;
  pointer-events: auto;
}

.preview-header {
  padding: var(--space-4) 1.25rem;
  background: var(--color-bg-subtle);
  border-bottom: var(--border-width) solid var(--color-border);
}

.preview-title {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--color-black);
  margin: 0 0 var(--space-1) 0;
  line-height: var(--leading-snug);
}

.preview-meta {
  font-family: var(--font-body);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin: 0;
}

.preview-body {
  padding: var(--space-4) 1.25rem;
  max-height: 300px;
  overflow-y: auto;
}

.preview-content,
.preview-citation {
  font-family: var(--font-body);
  font-size: 0.9rem;
  line-height: var(--leading-relaxed);
  color: var(--color-text);
  margin: 0;
}

.preview-loading {
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--color-text-muted);
  font-style: italic;
  margin: 0;
}

.preview-error {
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--color-error);
  margin: 0;
}

.preview-external-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: 0.75rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--color-primary);
  text-decoration: none;
  font-weight: var(--font-medium);
  transition: color var(--transition-base);
}

.preview-external-link:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

.preview-external-link svg {
  width: 14px;
  height: 14px;
}

/* ==========================================
   RELATED POSTS SECTION
   ========================================== */
.related-posts-section {
  width: 100vw;
  margin-left: calc(50% - 50vw);
  background: var(--color-primary);
  padding: var(--space-16) 0;
}

.related-posts-container {
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: 0 var(--space-8);
  display: grid;
  grid-template-columns: 1fr 3fr;
  gap: var(--space-8);
  align-items: start;
}

.related-posts-title {
  font-family: var(--font-body);
  font-size: var(--text-3xl);
  font-weight: var(--font-light);
  font-style: normal;
  color: var(--color-white);
  line-height: 47px;
  padding-top: var(--space-2);
}

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

.related-post-card {
  display: flex;
  flex-direction: column;
  text-decoration: none;
}

.related-post-image {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: var(--border-width) solid var(--color-border-dark);
  border-radius: var(--radius-sm);
}

.related-post-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.related-post-image-placeholder {
  background: var(--gradient-dark);
}

.related-post-content {
  padding: var(--space-4) 0;
}

.related-post-date {
  display: block;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  letter-spacing: var(--tracking-wide);
  color: var(--color-white);
  margin-bottom: var(--space-2);
}

.related-post-title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--font-medium);
  color: var(--color-white);
  line-height: 28px;
  margin: 0 0 var(--space-2) 0;
  text-align: left;
}

.related-post-description {
  font-family: var(--font-article);
  font-size: 16px;
  line-height: 26px;
  color: var(--color-white);
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ==========================================
   ADVISOR & AUTHOR PROFILE NAMES
   ========================================== */
.profile-info h1 {
  font-family: var(--font-heading);
  font-size: var(--text-article-title);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text);
}

/* ==========================================
   RESPONSIVE STYLES
   ========================================== */
@media (max-width: 1024px) {
  .related-posts-container {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .related-posts-title {
    font-size: 1.75rem;
  }

  .related-posts-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 968px) {
  .profile-info h1 {
    font-size: var(--text-3xl);
    line-height: var(--leading-tight);
  }
}

@media (max-width: 768px) {
  .article-title {
    font-size: 28px;
    line-height: var(--leading-tight);
  }

  .article-content,
  .article-content p,
  .article-content li,
  .article-content blockquote {
    font-size: 19px;
    line-height: var(--leading-relaxed);
  }

  .article-content h2 {
    font-size: 26px;
    margin: 2.5rem 0 1rem;
  }

  .article-content h3 {
    font-size: var(--text-article-body);
    margin: var(--space-8) 0 0.75rem;
  }

  .profile-info h1 {
    font-size: var(--text-2xl);
    line-height: var(--leading-tight);
  }

  .related-posts-section {
    padding: var(--space-12) 0;
  }

  .related-posts-container {
    padding: 0 var(--space-4);
  }

  .related-posts-title {
    font-size: var(--text-xl);
  }

  .related-posts-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .related-post-title {
    font-size: var(--text-md);
    line-height: var(--text-xl);
  }

  .related-post-description {
    font-size: var(--text-sm);
    line-height: var(--text-article-body);
  }

  .citation-widget {
    padding: var(--space-6);
  }

  .citation-tabs {
    flex-direction: row;
    overflow-x: auto;
  }

  .citation-tab {
    padding: var(--space-2) var(--space-4);
    font-size: 0.875rem;
    white-space: nowrap;
  }

  .citation-text p {
    font-size: 0.875rem;
  }

  .page-preview-popup {
    width: 95vw;
    max-width: 95vw;
  }

  .preview-body {
    max-height: 200px;
  }
}