/* Premium Article Page Styling */

.article-layout-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin-top: 10.5rem;
  margin-bottom: 6rem;
  align-items: start;
}

@media (min-width: 992px) {
  .article-layout-grid {
    grid-template-columns: 240px 1fr;
    gap: 3.5rem;
    margin-top: 11.5rem;
  }
}

/* Sidebar Columns styling */
.article-sidebar-left {
  display: none;
}

@media (min-width: 992px) {
  .article-sidebar-left {
    display: block;
    position: sticky;
    top: 7.5rem;
  }
}

.sticky-sidebar-content {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

/* Sidebar Widgets */
.toc-container h4,
.share-widget h4 {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary-dark);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
  font-family: var(--font-body);
}

/* Table of Contents links */
.toc-container ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.toc-link {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.4;
  display: block;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.toc-link:hover,
.toc-link.active {
  color: var(--color-primary);
  font-weight: 600;
  transform: translateX(4px);
}

/* Share buttons widget */
.share-buttons {
  display: flex;
  gap: 0.5rem;
}

.share-btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background-color: var(--color-card-bg);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.share-btn svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.share-btn:hover {
  transform: translateY(-2px);
  color: var(--color-text-light);
}

.share-btn.whatsapp:hover {
  background-color: #25D366;
  border-color: #25D366;
}

.share-btn.linkedin:hover {
  background-color: #0077B5;
  border-color: #0077B5;
}

.share-btn.twitter:hover {
  background-color: #1DA1F2;
  border-color: #1DA1F2;
}

.share-btn.copy:hover {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

/* Reading Progress Bar container */
.reading-progress-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background-color: rgba(74, 107, 93, 0.08);
  z-index: 1001; /* Sticky just above headers */
}

.reading-progress-bar {
  height: 100%;
  width: 0%;
  background-color: var(--color-accent);
  transition: width 0.1s ease-out;
}

/* Visual Breadcrumbs */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  flex-wrap: wrap;
  line-height: 1.4;
}

.breadcrumbs a {
  color: var(--color-primary);
  font-weight: 500;
  transition: color var(--transition-fast);
}

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

.breadcrumbs .separator {
  color: var(--color-border);
}

.breadcrumbs .current {
  color: var(--color-text-muted);
  font-weight: 400;
}

/* Article Hero Image */
.article-featured-image-wrapper {
  margin: 2rem 0;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.article-featured-image {
  width: 100%;
  height: auto;
  max-height: 420px;
  object-fit: cover;
  display: block;
}

/* Collapsible Mobile TOC */
.mobile-toc-container {
  display: block;
  background: var(--color-primary-light);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.25rem;
  margin: 1.5rem 0 2rem 0;
}

@media (min-width: 992px) {
  .mobile-toc-container {
    display: none;
  }
}

.mobile-toc-container summary {
  font-weight: 600;
  font-family: var(--font-heading);
  color: var(--color-primary-dark);
  cursor: pointer;
  outline: none;
  font-size: 1.05rem;
}

.mobile-toc-container ul {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  border-left: 2px solid var(--color-border);
  padding-left: 1rem;
}

/* Article Tags */
.article-tags {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 3rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.article-tags span {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-primary-dark);
}

.tag-link {
  display: inline-block;
  padding: 0.3rem 0.85rem;
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
  font-size: 0.82rem;
  border-radius: 50px;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.tag-link:hover {
  background-color: var(--color-primary);
  color: var(--color-text-light);
  transform: translateY(-1px);
}

/* Prev / Next Article Navigation block */
.prev-next-nav {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 2.25rem 0;
  margin: 3.5rem 0;
}

@media (min-width: 576px) {
  .prev-next-nav {
    grid-template-columns: 1fr 1fr;
  }
}

.prev-article,
.next-article {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.next-article {
  text-align: right;
  align-items: flex-end;
}

.prev-next-nav .nav-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.35rem;
  letter-spacing: 0.05em;
}

.prev-next-nav a {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  color: var(--color-primary-dark);
  font-weight: 600;
  line-height: 1.4;
  transition: color var(--transition-fast);
}

.prev-next-nav a:hover {
  color: var(--color-primary);
}

/* Related Articles Section */
.related-articles-section {
  margin-top: 4rem;
}

.related-articles-section h3 {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  color: var(--color-primary-dark);
  margin-bottom: 1.5rem;
  text-align: center;
}

.related-articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .related-articles-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 992px) {
  .related-articles-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

.related-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

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

.related-card img {
  width: 100%;
  height: 150px;
  object-fit: cover;
  border-bottom: 1px solid var(--color-border);
}

.related-card-content {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.related-category {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
  letter-spacing: 0.05em;
}

.related-card-content h4 {
  font-size: 1rem;
  font-family: var(--font-heading);
  line-height: 1.4;
  margin: 0;
  font-weight: 600;
}

.related-card-content h4 a {
  color: var(--color-primary-dark);
  text-decoration: none;
}

.related-card-content h4 a:hover {
  color: var(--color-primary);
}

/* Floating Back to Top Button */
#back-to-top-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 1000;
  border: none;
  outline: none;
  background-color: var(--color-primary);
  color: white;
  cursor: pointer;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  box-shadow: var(--shadow-md);
  font-size: 1.25rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

#back-to-top-btn.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

#back-to-top-btn:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}