/**
 * ZeroExfil Blog Styles
 * @description Reading-focused blog layout. Extends ../style.css design tokens.
 * @license Proprietary - ZeroExfil
 */

/* ==========================================================================
   1. Reading progress bar
   ========================================================================== */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: var(--color-primary);
  z-index: 9999;
  transition: width 0.05s linear;
  pointer-events: none;
}

/* ==========================================================================
   2. Subnav + breadcrumbs
   ========================================================================== */
.blog-subnav {
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  background: rgba(255, 255, 255, 0.92);
}

.blog-subnav-inner {
  max-width: var(--container-lg);
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.blog-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.blog-eyebrow .accent {
  width: 6px;
  height: 6px;
  background: var(--color-primary);
  border-radius: 50%;
  display: inline-block;
}

.blog-eyebrow strong {
  color: var(--color-text);
  font-weight: 700;
}

.blog-subnav-actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.subnav-link {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  padding-bottom: 1px;
}

.subnav-link:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.subnav-link.rss {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
}

.subnav-link.rss:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* Breadcrumbs */
.breadcrumbs {
  max-width: var(--container-lg);
  margin: 0 auto;
  padding: 1.25rem 1.25rem 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.breadcrumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0;
  margin: 0;
}

.breadcrumbs li {
  display: inline-flex;
  align-items: center;
}

.breadcrumbs li + li::before {
  content: '/';
  margin-right: 0.5rem;
  color: var(--border-light);
}

.breadcrumbs a {
  color: var(--color-text-secondary);
  text-decoration: none;
}

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

.breadcrumbs [aria-current="page"] {
  color: var(--color-text);
}

/* ==========================================================================
   3. Blog index
   ========================================================================== */
.blog-hero {
  background: #f8f8f8;
  border-bottom: 1px solid var(--border-light);
  padding: 0;
  margin: 0 0 1rem;
}

.blog-hero-inner {
  max-width: var(--container-lg);
  margin: 0 auto;
  padding: 3.5rem 1.25rem 3.5rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.blog-hero .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-primary);
  font-weight: 700;
  margin-bottom: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.blog-hero .eyebrow::before,
.blog-hero .eyebrow::after {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--color-primary);
  opacity: 0.6;
}

.blog-hero h1 {
  font-size: clamp(1.75rem, 3.5vw, 2.4rem);
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
  font-weight: 700;
  line-height: 1.2;
  max-width: 28ch;
}

.blog-hero p {
  color: var(--color-text-secondary);
  font-size: 1rem;
  max-width: 56ch;
  margin: 0;
  line-height: 1.6;
}

.blog-content {
  max-width: var(--container-lg);
  margin: 0 auto;
  padding: 2.5rem 1.25rem 5rem;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  font-weight: 700;
  margin: 0 0 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-light);
}

/* Featured post (first / hero post) */
.featured-post {
  display: block;
  text-decoration: none;
  color: inherit;
  margin-bottom: 4rem;
  padding: 2.5rem 0 3rem;
  border-bottom: 1px solid var(--border-light);
  transition: opacity var(--transition-base);
}

.featured-post:hover {
  text-decoration: none;
}

.featured-post:hover h2 {
  color: var(--color-primary);
}

.featured-post .post-meta {
  margin-bottom: 1.25rem;
}

.featured-post h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0 0 1rem;
  max-width: 22ch;
  transition: color var(--transition-base);
}

.featured-post .excerpt {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
  max-width: 60ch;
}

/* Standard post grid */
.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2.5rem 2rem;
}

.post-card {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  padding: 0;
  background: transparent;
  border: none;
  transition: opacity var(--transition-base);
}

.post-card:hover {
  text-decoration: none;
}

.post-card:hover h3 {
  color: var(--color-primary);
}

.post-card:focus-visible,
.featured-post:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 6px;
  border-radius: var(--radius-sm);
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  text-transform: uppercase;
  margin-bottom: 0.85rem;
}

.post-tag {
  color: var(--color-primary);
  font-weight: 700;
  text-decoration: none;
}

.post-meta .sep {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.5;
  display: inline-block;
}

.post-card h3 {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.25;
  margin: 0 0 0.65rem;
  color: var(--color-text);
  transition: color var(--transition-base);
}

.post-card .excerpt {
  color: var(--color-text-secondary);
  line-height: 1.55;
  margin: 0;
  font-size: 0.98rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-empty {
  text-align: center;
  color: var(--color-text-muted);
  padding: 4rem 1rem;
  border: 1px dashed var(--border-light);
  border-radius: var(--radius-lg);
}

/* ==========================================================================
   4. Article layout
   ========================================================================== */
.article-shell {
  max-width: var(--container-lg);
  margin: 0 auto;
  padding: 2rem 1.25rem 5rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 3rem;
}

@media (min-width: 1100px) {
  .article-shell {
    grid-template-columns: 220px minmax(0, 1fr) 200px;
    align-items: start;
  }
}

.toc-sidebar {
  display: none;
}

@media (min-width: 1100px) {
  .toc-sidebar {
    display: block;
    position: sticky;
    top: 5rem;
    align-self: start;
    max-height: calc(100vh - 7rem);
    overflow-y: auto;
    padding-right: 0.5rem;
  }
}

.toc-sidebar .toc-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  font-weight: 700;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-light);
}

.toc-sidebar ol {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.5;
}

.toc-sidebar li {
  margin: 0.5rem 0;
}

.toc-sidebar li.toc-h3 {
  padding-left: 0.85rem;
  font-size: 0.83rem;
}

.toc-sidebar a {
  color: var(--color-text-secondary);
  text-decoration: none;
  border-left: 2px solid transparent;
  padding-left: 0.6rem;
  margin-left: -0.6rem;
  display: block;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.toc-sidebar a:hover {
  color: var(--color-primary);
}

.toc-sidebar a.active {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  font-weight: 600;
}

.article-aside {
  display: none;
}

@media (min-width: 1100px) {
  .article-aside {
    display: block;
    position: sticky;
    top: 5rem;
    align-self: start;
    font-size: 0.85rem;
  }
}

.share-block {
  border-top: 1px solid var(--border-light);
  padding-top: 1rem;
}

.share-block .share-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  font-weight: 700;
  margin-bottom: 0.85rem;
}

.share-buttons {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: transparent;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  font-family: inherit;
  text-decoration: none;
  transition: all var(--transition-base);
}

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

.share-btn[data-copied="true"] {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.share-block-bottom {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-light);
}

.share-block-bottom .share-buttons {
  flex-direction: row;
  flex-wrap: wrap;
}

/* Mobile inline TOC */
.toc-mobile {
  margin: 1.5rem 0 2.5rem;
  padding: 1.25rem 1.5rem;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-primary);
}

@media (min-width: 1100px) {
  .toc-mobile { display: none; }
}

.toc-mobile summary {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text);
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}

.toc-mobile summary::-webkit-details-marker { display: none; }

.toc-mobile summary::after {
  content: '+';
  float: right;
  font-family: var(--font-sans);
  font-size: 1.2rem;
  line-height: 1;
  color: var(--color-primary);
  transition: transform var(--transition-base);
}

.toc-mobile[open] summary::after { content: '\2013'; }

.toc-mobile ol {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
}

.toc-mobile li { margin: 0.4rem 0; }
.toc-mobile li.toc-h3 { padding-left: 1rem; font-size: 0.92rem; }

.toc-mobile a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
}

.toc-mobile a:hover { color: var(--color-primary); }

/* ==========================================================================
   5. Article typography
   ========================================================================== */
.post-article {
  max-width: 720px;
  margin: 0 auto;
  width: 100%;
}

.post-header {
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-light);
}

.post-header .post-meta {
  margin-bottom: 1.25rem;
}

.post-header h1 {
  font-size: clamp(1.85rem, 4.5vw, 2.6rem);
  letter-spacing: -0.025em;
  line-height: 1.15;
  font-weight: 700;
  margin: 0 0 1rem;
  color: var(--color-text);
}

.post-header .post-lede {
  font-size: 1.15rem;
  line-height: 1.55;
  color: var(--color-text-secondary);
  margin: 0;
}

.post-author {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.5rem;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

.post-author .author-by {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  font-weight: 700;
}

.post-author .author-name {
  color: var(--color-text);
  font-weight: 600;
}

.post-content {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--color-text);
}

.post-content > * + * {
  margin-top: 1.25rem;
}

.post-content > ul + *,
.post-content > ol + * {
  margin-top: 2.5rem;
}

.post-content > * + ul,
.post-content > * + ol {
  margin-top: 1.25rem;
}

.post-content ul,
.post-content ol {
  margin-bottom: 0;
}

.post-content h2,
.post-content h3 {
  position: relative;
  scroll-margin-top: 5rem;
}

.post-content h2 {
  font-size: 1.55rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  margin-top: 3rem;
  line-height: 1.25;
}

.post-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-top: 2.25rem;
  line-height: 1.35;
}

.post-content h2 .anchor,
.post-content h3 .anchor {
  position: absolute;
  left: -1.25rem;
  top: 50%;
  transform: translateY(-50%);
  opacity: 0;
  color: var(--color-primary);
  font-weight: 400;
  text-decoration: none;
  font-size: 1rem;
  transition: opacity var(--transition-fast);
}

@media (max-width: 1099px) {
  .post-content h2 .anchor,
  .post-content h3 .anchor { display: none; }
}

.post-content h2:hover .anchor,
.post-content h3:hover .anchor {
  opacity: 1;
}

.post-content p { margin: 0; }

.post-content ul,
.post-content ol {
  padding-left: 1.5rem;
}

.post-content li + li {
  margin-top: 0.5rem;
}

.post-content li > ul,
.post-content li > ol {
  margin-top: 0.5rem;
}

.post-content a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
}

.post-content a:hover {
  text-decoration-thickness: 2px;
}

.post-content blockquote {
  border-left: 3px solid var(--color-primary);
  padding: 0.75rem 1.5rem;
  color: var(--color-text);
  font-style: normal;
  font-size: 1.15rem;
  font-weight: 500;
  line-height: 1.5;
  background: var(--color-primary-transparent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-top: 1.75rem;
}

.post-content blockquote p { margin: 0; }
.post-content blockquote + * { margin-top: 1.75rem; }

.post-content figure { margin: 2rem 0; }

.post-content figcaption {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  text-align: center;
  margin-top: 0.75rem;
  font-style: italic;
}

.post-content img {
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  margin: 0 auto;
  display: block;
}

.post-content hr {
  border: none;
  border-top: 1px solid var(--border-light);
  margin: 3rem 0;
}

.post-content kbd {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--color-bg-secondary);
  border: 1px solid var(--border-light);
  border-bottom-width: 2px;
  border-radius: var(--radius-sm);
  padding: 0.1em 0.45em;
  color: var(--color-text);
}

/* Pull-quote callout */
.callout {
  margin-top: 2.25rem;
  padding: 1.5rem 1.75rem;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-primary);
}

.callout .callout-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.callout p { margin: 0.5rem 0 0; }

/* Stats / numbers display */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
  padding: 1.5rem;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
}

.stat-item {
  text-align: center;
}

.stat-item .stat-value {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.stat-item .stat-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-top: 0.4rem;
  display: block;
  line-height: 1.4;
}

/* Data tables */
.data-table-wrap {
  margin-top: 2rem;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  background: var(--color-bg-secondary);
  overflow: hidden;
}

.data-table-wrap > summary {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text);
  font-weight: 700;
  cursor: pointer;
  padding: 1rem 1.25rem;
  list-style: none;
  user-select: none;
}

.data-table-wrap > summary::-webkit-details-marker { display: none; }

.data-table-wrap > summary::after {
  content: '+';
  float: right;
  font-family: var(--font-sans);
  font-size: 1.2rem;
  line-height: 1;
  color: var(--color-primary);
}

.data-table-wrap[open] > summary::after { content: '\2013'; }

.data-table-wrap[open] > summary {
  border-bottom: 1px solid var(--border-light);
}

.table-scroll {
  max-height: 480px;
  overflow: auto;
  background: var(--color-bg);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.data-table thead th {
  position: sticky;
  top: 0;
  background: var(--color-bg-secondary);
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  font-weight: 700;
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--border-light);
  z-index: 1;
}

.data-table tbody td {
  padding: 0.55rem 1rem;
  border-bottom: 1px solid var(--border-light);
  vertical-align: middle;
}

.data-table tbody tr:last-child td { border-bottom: none; }

.data-table tbody tr:hover td { background: var(--color-bg-secondary); }

.data-table .num {
  width: 3rem;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.data-table td code {
  font-size: 0.88em;
  padding: 0.1em 0.4em;
}

.pill {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  border: 1px solid transparent;
  line-height: 1.2;
}

.pill.yes {
  color: #1f7a3d;
  background: rgba(31, 122, 61, 0.08);
  border-color: rgba(31, 122, 61, 0.25);
}

.pill.no {
  color: var(--color-primary-dark, #c1121f);
  background: rgba(193, 18, 31, 0.06);
  border-color: rgba(193, 18, 31, 0.2);
}

/* ==========================================================================
   6. Code blocks
   ========================================================================== */
.post-content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--color-bg-secondary);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  color: var(--color-text);
  word-wrap: break-word;
}

.post-content pre {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  background: #0f1115;
  color: #e7e9ee;
  padding: 1.75rem 1.5rem 1.5rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  line-height: 1.6;
  position: relative;
  margin-top: 1.5rem;
}

.post-content pre code {
  background: transparent;
  border: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

.code-block {
  position: relative;
  margin-top: 1.5rem;
}

.code-block .code-lang {
  position: absolute;
  top: 0;
  left: 1.25rem;
  transform: translateY(-50%);
  background: var(--color-bg);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.15rem 0.5rem;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  z-index: 2;
}

.code-block pre { margin-top: 0; }

.copy-btn {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  background: rgba(255, 255, 255, 0.08);
  color: #b8bcc6;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--transition-base), background var(--transition-base), color var(--transition-base);
  z-index: 2;
}

.code-block:hover .copy-btn,
.code-block:focus-within .copy-btn,
.copy-btn:focus-visible {
  opacity: 1;
}

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

.copy-btn[data-copied="true"] {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
  opacity: 1;
}

/* ==========================================================================
   7. Article footer / related
   ========================================================================== */
.post-footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-light);
}

.post-footer-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
  font-size: 0.92rem;
  color: var(--color-text-muted);
}

.post-footer-meta a {
  color: var(--color-text-secondary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.post-footer-meta a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.share-inline {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
}

.share-inline .share-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-right: 0.5rem;
}

.related-posts {
  margin-top: 4rem;
}

.related-posts h2 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  font-weight: 700;
  margin: 0 0 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-light);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 2rem;
}

.related-grid .post-card h3 { font-size: 1.15rem; }

/* CTA inside article */
.article-cta {
  margin-top: 4rem;
  padding: 2.5rem 2rem;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  text-align: center;
  border: 1px solid var(--border-light);
}

.article-cta h3 {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 0.75rem;
}

.article-cta p {
  color: var(--color-text-secondary);
  margin: 0 0 1.5rem;
  font-size: 1rem;
  line-height: 1.55;
  max-width: 50ch;
  margin-left: auto;
  margin-right: auto;
}

.article-cta .btn-primary {
  padding: 0.85rem 2rem;
  font-size: 0.95rem;
}

/* ==========================================================================
   8. Print
   ========================================================================== */
@media print {
  .reading-progress,
  .blog-subnav,
  .breadcrumbs,
  .toc-sidebar,
  .toc-mobile,
  .article-aside,
  .copy-btn,
  .article-cta,
  .related-posts,
  footer[role="contentinfo"] {
    display: none !important;
  }
  .article-shell {
    grid-template-columns: 1fr;
    padding: 0;
  }
  .post-content pre {
    background: #f4f4f4;
    color: #111;
    border: 1px solid #ddd;
  }
  body { color: #000; background: #fff; }
}

/* ==========================================================================
   9. Responsive
   ========================================================================== */
@media (max-width: 720px) {
  .blog-subnav-inner { padding: 0.75rem 1rem; }
  .blog-eyebrow { font-size: 0.72rem; }
  .subnav-link { font-size: 0.82rem; }
  .subnav-link.rss { display: none; }

  .breadcrumbs { padding: 1rem 1rem 0; font-size: 0.8rem; }

  .blog-hero-inner { padding: 2.5rem 1rem 2.5rem; }
  .blog-hero h1 { font-size: 1.6rem; }
  .blog-hero p { font-size: 0.95rem; }
  .blog-content { padding: 1.5rem 1rem 4rem; }

  .featured-post { padding: 1.5rem 0 2.5rem; margin-bottom: 2.5rem; }
  .featured-post h2 { font-size: 1.6rem; }
  .featured-post .excerpt { font-size: 1rem; }

  .post-grid { grid-template-columns: 1fr; gap: 2rem; }
  .post-card h3 { font-size: 1.2rem; }

  .article-shell { padding: 1.5rem 1rem 4rem; gap: 1.5rem; }

  .post-header { margin-bottom: 2rem; padding-bottom: 1.5rem; }
  .post-author { margin-top: 1.25rem; }
  .post-content { font-size: 1rem; line-height: 1.7; }
  .post-content h2 { font-size: 1.35rem; margin-top: 2.25rem; }
  .post-content h3 { font-size: 1.1rem; margin-top: 1.75rem; }
  .post-content blockquote { font-size: 1.05rem; padding: 0.65rem 1rem; }
  .post-content pre { padding: 1rem; font-size: 0.82rem; }

  .post-footer-meta { flex-direction: column; align-items: flex-start; }
  .stat-item .stat-value { font-size: 1.6rem; }
}

@media (prefers-reduced-motion: reduce) {
  .reading-progress { transition: none; }
  * { scroll-behavior: auto !important; }
}