/* ==========================================================================
   ARTICLE READING PAGE
   Premium typography & layout matching Serena storefront
   ========================================================================== */

/* ========== Article Header ========== */
.article-header {
  padding: 2rem 0 0;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  margin-bottom: 1.5rem;
  transition: color 0.2s ease;
}
.back-link:hover { color: var(--color-accent-purple); }

.article-meta-top {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

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

.article-title {
  font-family: var(--font-family-heading);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1.2;
  margin: 0 0 0.75rem;
  max-width: 860px;
}

.article-subtitle {
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin: 0 0 1.25rem;
  max-width: 860px;
}
.article-subtitle:empty { display: none; }

.article-author-line {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: 2rem;
}
.article-author-line strong {
  color: var(--color-text-primary);
  font-weight: 600;
}

/* Hero image: full container width */
.article-featured-image-wrap {
  width: 100%;
  margin-bottom: 0.5rem;
}
.article-featured-image {
  width: 100%;
  height: auto;
  max-height: 520px;
  object-fit: cover;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  display: block;
}

/* ========== Two-Column Layout ========== */
.article-layout {
  padding: 2.5rem 0 0;
}

.article-layout-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 3rem;
  align-items: start;
}

/* ========== Sidebar ========== */
.article-sidebar {
  position: sticky;
  top: 100px;
}

.sidebar-inner {
  padding-right: 1rem;
}

.sidebar-heading {
  font-family: var(--font-family-label);
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-tertiary);
  margin: 0 0 0.75rem;
}

.article-toc {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

.toc-item {
  display: block;
  font-size: 0.8125rem;
  line-height: 1.4;
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: 0.375rem 0 0.375rem 0.75rem;
  border-left: 2px solid transparent;
  transition: all 0.2s ease;
  cursor: pointer;
}
.toc-item:hover {
  color: var(--color-text-primary);
}
.toc-item.active {
  color: var(--color-accent-purple);
  font-weight: 600;
  border-left-color: var(--color-accent-purple);
}

.sidebar-divider {
  height: 1px;
  background: var(--color-gray-200);
  margin: 1.25rem 0;
}

.share-section { margin-top: 0; }

.copy-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: none;
  border: 1px solid var(--color-gray-200);
  border-radius: 6px;
  padding: 0.5rem 0.875rem;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font-family-body);
}
.copy-link-btn:hover {
  color: var(--color-accent-purple);
  border-color: var(--color-accent-purple);
}
.copy-link-btn.copied {
  color: var(--color-success-dark);
  border-color: var(--color-success-dark);
}

/* ========== Mobile TOC ========== */
.mobile-toc {
  display: none;
  margin-bottom: 2rem;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-default);
  overflow: hidden;
}

.mobile-toc-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.875rem 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-primary);
  cursor: pointer;
  background: var(--color-gray-50);
  list-style: none;
}
.mobile-toc-toggle::-webkit-details-marker { display: none; }
.mobile-toc-toggle svg {
  transition: transform 0.2s ease;
}
.mobile-toc[open] .mobile-toc-toggle svg {
  transform: rotate(180deg);
}

.mobile-toc-list {
  padding: 0.5rem 1rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}
.mobile-toc-list .toc-item {
  padding: 0.5rem 0 0.5rem 0.75rem;
  font-size: 0.875rem;
}

/* ========== Article Content — Reading Typography ========== */
/* Content fills the full 1fr grid column — no artificial width cap */
.article-main {
  min-width: 0;
}

.article-content {
  font-family: var(--font-family-body);
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--color-text-primary);
}

.article-content h2 {
  font-family: var(--font-family-heading);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin: 3rem 0 1rem;
  line-height: 1.3;
  scroll-margin-top: 80px;
}

.article-content h3 {
  font-family: var(--font-family-heading);
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin: 2rem 0 0.75rem;
  line-height: 1.35;
}

.article-content h4 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin: 1.5rem 0 0.5rem;
}

.article-content p {
  margin: 0 0 1.5rem;
  color: var(--color-text-primary);
}

.article-content a {
  color: var(--color-accent-purple);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}
.article-content a:hover {
  border-bottom-color: var(--color-accent-purple);
}

.article-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-default);
  margin: 2rem 0;
  display: block;
}

.article-content figure {
  margin: 2rem 0;
}
.article-content figure img {
  margin: 0 0 0.5rem;
}
.article-content figcaption {
  font-size: 0.875rem;
  font-style: italic;
  color: var(--color-text-tertiary);
  text-align: center;
}

/* Blockquote */
.article-content blockquote {
  border-left: 3px solid var(--color-gray-300);
  margin: 1.75rem 0;
  padding: 0.25rem 0 0.25rem 1.25rem;
  font-style: italic;
  color: var(--color-text-secondary);
}
.article-content blockquote p { margin-bottom: 0; }

/* Lists */
.article-content ul,
.article-content ol {
  margin: 0 0 1.5rem;
  padding-left: 1.5rem;
}
.article-content li {
  margin-bottom: 0.5rem;
  line-height: 1.7;
}
.article-content li::marker {
  color: var(--color-accent-purple);
}

/* Code */
.article-content code {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.88em;
  background: var(--color-gray-100);
  padding: 0.125rem 0.375rem;
  border-radius: 4px;
  color: var(--color-accent-purple-dark);
}
.article-content pre {
  background: var(--color-gray-900);
  color: var(--color-gray-200);
  padding: 1.25rem;
  border-radius: var(--radius-default);
  overflow-x: auto;
  margin: 1.75rem 0;
  line-height: 1.5;
}
.article-content pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: 0.875rem;
}

/* Tables */
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.75rem 0;
  font-size: 0.9375rem;
}
.article-content th,
.article-content td {
  text-align: left;
  padding: 0.625rem 0.875rem;
  border-bottom: 1px solid var(--color-gray-200);
}
.article-content th {
  font-weight: 600;
  color: var(--color-text-primary);
  background: var(--color-gray-50);
}

/* Callout & Warning Boxes */
.article-content .callout-box {
  background: rgba(123, 63, 157, 0.06);
  border-left: 3px solid var(--color-accent-purple);
  padding: 1.25rem;
  border-radius: 0 var(--radius-default) var(--radius-default) 0;
  margin: 1.75rem 0;
}
.article-content .callout-box p:last-child { margin-bottom: 0; }

.article-content .warning-box {
  background: rgba(239, 68, 68, 0.06);
  border-left: 3px solid var(--color-error);
  padding: 1.25rem;
  border-radius: 0 var(--radius-default) var(--radius-default) 0;
  margin: 1.75rem 0;
}
.article-content .warning-box p:last-child { margin-bottom: 0; }

/* Horizontal rules */
.article-content hr {
  border: none;
  border-top: 1px solid var(--color-gray-200);
  margin: 2.5rem 0;
}

/* ========== Tags ========== */
.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-gray-200);
}

.tag-pill {
  display: inline-block;
  padding: 0.3125rem 0.875rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-gray-100);
  border-radius: 20px;
  text-decoration: none;
  transition: all 0.2s ease;
}
.tag-pill:hover {
  color: var(--color-accent-purple);
  background: rgba(123, 63, 157, 0.08);
}

/* ========== Article Divider ========== */
.article-divider {
  border: none;
  border-top: 1px solid var(--color-gray-200);
  margin: 3rem 0 0;
}

/* ========== Article CTA ========== */
.article-cta {
  background: var(--gradient-primary);
  padding: 4rem 0;
  text-align: center;
  margin-top: 3rem;
}
.article-cta h2 {
  font-family: var(--font-family-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-white);
  margin: 0 0 0.75rem;
}
.article-cta p {
  font-size: 1.125rem;
  color: rgba(255, 255, 255, 0.9);
  max-width: 480px;
  margin: 0 auto 1.5rem;
  line-height: 1.6;
}
.article-cta .btn-cta {
  display: inline-block;
  padding: 1rem 2.25rem;
  background: var(--color-white);
  color: var(--color-accent-purple);
  font-family: var(--font-family-label);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  border: none;
  cursor: pointer;
  text-decoration: none;
}
.article-cta .btn-cta:hover {
  background: rgba(255, 255, 255, 0.9);
  transform: translateY(-1px);
}

/* ========== Related Articles ========== */
.related-articles-section {
  padding: 4rem 0;
}
.related-articles-section .section-title {
  font-family: var(--font-family-heading);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 2rem;
}

/* ========== 404 State ========== */
.article-not-found {
  text-align: center;
  padding: 5rem 1rem;
}
.article-not-found h1 {
  font-family: var(--font-family-heading);
  font-size: 2rem;
  margin-bottom: 0.75rem;
}
.article-not-found p {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
}
.article-not-found a {
  color: var(--color-accent-purple);
  font-weight: 600;
}

/* ========== Responsive ========== */
@media (max-width: 1024px) {
  .article-layout-grid {
    grid-template-columns: 200px 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .article-sidebar { display: none; }
  .mobile-toc { display: block; }

  .article-layout-grid {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .article-title { font-size: 1.75rem; }
  .article-subtitle { font-size: 1.125rem; }
  .article-header { padding: 1.5rem 0 0; }

  .article-featured-image {
    max-height: 280px;
  }

  .article-content {
    font-size: 1rem;
    overflow-wrap: break-word;
    word-break: break-word;
  }
  .article-content h2 { font-size: 1.5rem; margin-top: 2.25rem; }
  .article-content h3 { font-size: 1.25rem; margin-top: 1.75rem; }
  .article-content table { display: block; overflow-x: auto; }

  .article-cta { padding: 2.5rem 0; }
  .article-cta h2 { font-size: 1.5rem; }
  .article-cta .btn-cta { display: block; width: 100%; text-align: center; }

  .related-articles-section { padding: 2.5rem 0; }
  .related-articles-section .articles-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .article-title { font-size: 1.625rem; }
  .article-featured-image { border-radius: var(--radius-default); max-height: 220px; }
}

/* ========== Print ========== */
@media print {
  .site-header, .site-footer, .article-sidebar, .mobile-toc,
  .article-cta, .related-articles-section,
  .back-link, .copy-link-btn { display: none !important; }
  .article-layout-grid { grid-template-columns: 1fr; }
  .article-content { font-size: 12pt; }
  .article-title { font-size: 24pt; }
  .article-content a { color: inherit; border-bottom: none; }
  .article-content a::after { content: " (" attr(href) ")"; font-size: 10pt; color: #666; }
}