/*
 * BLOG.CSS — Blog-specific styles.
 * Depends on theme.css (variables) and base.css (layout/utilities).
 */

/* ─── Post list page ───────────────────────────────────────────── */
.blog-header {
  padding: var(--space-3xl) 0 var(--space-2xl);
  border-bottom: 1px solid var(--border);
}

.blog-header h1 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3rem);
  color: var(--text-heading);
  margin-bottom: var(--space-sm);
}

.blog-header p {
  color: var(--text-2);
  font-size: 1.125rem;
  max-width: 540px;
}
.blog-header-byline {
  margin-top: .75rem;
  font-size: .8125rem !important;
  color: var(--text-3) !important;
}
.blog-header-byline a { color: var(--text-2); font-weight: 500; }
.blog-header-byline a:hover { color: var(--accent); }

/* Filter bar */
.filter-bar {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--border);
}

.filter-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-right: var(--space-xs);
}

.filter-btn {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 500;
  border: 1px solid var(--border-mid);
  background: transparent;
  color: var(--text-2);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition);
}

.filter-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.filter-btn.active {
  background: var(--accent-faint);
  border-color: var(--accent);
  color: var(--accent);
}

/* Post grid */
.post-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  padding: var(--space-2xl) 0;
}

@media (max-width: 900px) {
  .post-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .post-grid { grid-template-columns: 1fr; }
}

/* Featured post (first card, full width) */
.post-grid .post-card:first-child {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

@media (max-width: 700px) {
  .post-grid .post-card:first-child {
    grid-column: auto;
    grid-template-columns: 1fr;
  }
}

/* Post card */
.post-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color var(--transition), transform var(--transition-md);
}

.post-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.post-card-img {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--bg-elevated);
}

.post-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform var(--transition-md);
}

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

/* Fallback pattern when no image */
.post-card-img-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-elevated) 0%, var(--bg-surface) 100%);
}

.post-card-img-placeholder svg {
  width: 48px;
  height: 48px;
  opacity: 0.15;
  color: var(--accent);
}

.post-card-body {
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  flex: 1;
}

.post-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.post-card-cat {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  text-decoration: none;
}

.post-card-cat:hover { color: var(--accent-hover); }

.post-card-date {
  font-size: 0.75rem;
  color: var(--text-3);
}

.post-card h2,
.post-card h3 {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--text-heading);
  margin: 0;
}

.post-grid .post-card:first-child h2 {
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
}

.post-card h2 a,
.post-card h3 a {
  color: inherit;
  text-decoration: none;
}

.post-card h2 a:hover,
.post-card h3 a:hover {
  color: var(--accent);
}

.post-card-excerpt {
  font-size: 0.9rem;
  color: var(--text-2);
  line-height: 1.65;
  flex: 1;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  overflow: hidden;
}

.post-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--space-sm);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--border);
}

.post-read-more {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition);
}

.post-read-more:hover { gap: 8px; }

.post-read-time {
  font-size: 0.75rem;
  color: var(--text-3);
}

/* Pagination */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--border);
}

.page-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 var(--space-sm);
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-2);
  text-decoration: none;
  border: 1px solid var(--border-mid);
  transition: all var(--transition);
}

.page-link:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.page-link.current {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--text-inverted);
  font-weight: 700;
}

.page-link.disabled {
  opacity: 0.35;
  pointer-events: none;
}

/* ─── Post detail page ─────────────────────────────────────────── */
.post-detail {
  padding: var(--space-3xl) 0;
}

/* Article header */
.post-header {
  max-width: var(--max-w-content);
  margin: 0 auto var(--space-2xl);
}

.post-header-meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-lg);
}

.post-category-link {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  text-decoration: none;
  padding: 0.25rem 0.625rem;
  border: 1px solid var(--accent);
  border-radius: 999px;
}

.post-category-link:hover {
  background: var(--accent-faint);
}

.post-pub-date {
  font-size: 0.8125rem;
  color: var(--text-3);
}

.post-read-time-detail {
  font-size: 0.8125rem;
  color: var(--text-3);
}

.post-header h1 {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-heading);
  margin-bottom: var(--space-lg);
}

.post-intro {
  font-size: 1.125rem;
  color: var(--text-2);
  line-height: 1.7;
  font-style: italic;
}

/* Author byline */
.post-byline {
  display: flex;
  align-items: center;
  gap: .875rem;
  padding: 1rem 1.25rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin: 0 auto var(--space-xl);
  max-width: var(--max-w-content);
}
.post-byline-avatar {
  width: 40px; height: 40px;
  flex-shrink: 0;
  background: var(--accent);
  color: var(--text-inverted);
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  font-size: .6875rem;
  font-weight: 800;
  letter-spacing: -.01em;
}
.post-byline-info { display: flex; flex-direction: column; gap: .2rem; }
.post-byline-name {
  font-size: .875rem;
  font-weight: 600;
  color: var(--text-heading);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .25rem;
}
.post-byline-name a { color: var(--text-heading); }
.post-byline-name a:hover { color: var(--accent); }
.post-byline-title {
  font-size: .8125rem;
  font-weight: 400;
  color: var(--text-2);
}
.post-byline-sep { color: var(--text-3); }
.post-byline-meta {
  font-size: .75rem;
  color: var(--text-3);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .25rem;
}

/* Post cover image */
.post-cover {
  max-width: 860px;
  margin: 0 auto var(--space-3xl);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
}

.post-cover img {
  width: 100%;
  height: auto;
  display: block;
}

/* Article body — prose */
.post-body {
  max-width: var(--max-w-content);
  margin: 0 auto;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--text);
}

.post-body h2 {
  font-family: var(--font-heading);
  font-size: 1.625rem;
  font-weight: 700;
  color: var(--text-heading);
  margin: 2.5em 0 0.75em;
  padding-bottom: 0.4em;
  border-bottom: 1px solid var(--border);
}

.post-body h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-heading);
  margin: 2em 0 0.6em;
}

.post-body h4 {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-heading);
  margin: 1.5em 0 0.5em;
}

.post-body p {
  margin-bottom: 1.5em;
}

.post-body a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.post-body a:hover { color: var(--link-hover); }

.post-body ul,
.post-body ol {
  padding-left: 1.5em;
  margin-bottom: 1.5em;
}

.post-body li { margin-bottom: 0.4em; }

.post-body li > ul,
.post-body li > ol {
  margin-top: 0.4em;
  margin-bottom: 0;
}

.post-body blockquote {
  border-left: 3px solid var(--accent);
  margin: 2em 0;
  padding: var(--space-md) var(--space-lg);
  background: var(--accent-faint);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-style: italic;
  color: var(--text-2);
}

.post-body blockquote p:last-child { margin-bottom: 0; }

.post-body code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--bg-code);
  color: var(--accent);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.post-body pre {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-lg);
  overflow-x: auto;
  margin-bottom: 1.5em;
  line-height: 1.65;
  tab-size: 2;
}

.post-body pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text);
  font-size: 0.875rem;
}

.post-body img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin: 1.5em 0;
}

.post-body hr {
  border: none;
  border-top: 1px solid var(--border-mid);
  margin: 2.5em 0;
}

.post-body table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5em;
  font-size: 0.9rem;
}

.post-body th {
  background: var(--bg-elevated);
  color: var(--text-heading);
  font-weight: 600;
  text-align: left;
  padding: 0.6em 1em;
  border: 1px solid var(--border-mid);
}

.post-body td {
  padding: 0.6em 1em;
  border: 1px solid var(--border);
  color: var(--text);
}

.post-body tr:nth-child(even) td {
  background: var(--bg-surface);
}

/* Post tags */
.post-tags {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
  max-width: var(--max-w-content);
  margin: var(--space-2xl) auto 0;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border);
}

.post-tags-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-3);
}

.post-tag {
  font-size: 0.8125rem;
  color: var(--text-2);
  text-decoration: none;
  padding: 0.25rem 0.75rem;
  border: 1px solid var(--border-mid);
  border-radius: 999px;
  transition: all var(--transition);
}

.post-tag:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Author bio box */
.post-author {
  max-width: var(--max-w-content);
  margin: var(--space-2xl) auto;
  padding: var(--space-lg);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  display: flex;
  gap: var(--space-lg);
  align-items: flex-start;
}

.post-author-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--accent-faint);
  border: 2px solid var(--accent);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
}

.post-author-info h4 {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-heading);
  margin: 0 0 0.25rem;
}

.post-author-info p {
  font-size: 0.875rem;
  color: var(--text-2);
  margin: 0;
  line-height: 1.6;
}

/* Related posts */
.related-posts {
  padding: var(--space-3xl) 0;
  border-top: 1px solid var(--border);
}

.related-posts h2 {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  color: var(--text-heading);
  margin-bottom: var(--space-xl);
}

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

@media (max-width: 768px) {
  .related-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 500px) {
  .related-grid { grid-template-columns: 1fr; }
}

/* Post sidebar layout */
.post-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: var(--space-3xl);
  align-items: start;
}

@media (max-width: 1024px) {
  .post-layout { grid-template-columns: 1fr; }
}

/* Table of contents (sidebar) */
.toc {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  font-size: 0.875rem;
}

.toc-title {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: var(--space-md);
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.toc-list li a {
  color: var(--text-2);
  text-decoration: none;
  display: block;
  padding: 0.35rem 0.5rem;
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  transition: all var(--transition);
  line-height: 1.4;
}

.toc-list li a:hover {
  color: var(--text);
  background: var(--bg-elevated);
  border-left-color: var(--accent);
}

.toc-list li a.active {
  color: var(--accent);
  background: var(--accent-faint);
  border-left-color: var(--accent);
}

.toc-list .toc-h3 a {
  padding-left: 1.25rem;
  font-size: 0.8125rem;
}

/* Reading progress bar */
.reading-progress {
  position: fixed;
  top: var(--nav-h);
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--accent);
  z-index: 200;
  transition: width 100ms linear;
}

/* Empty state */
.blog-empty {
  text-align: center;
  padding: var(--space-4xl) 0;
  color: var(--text-2);
}

.blog-empty svg {
  width: 64px;
  height: 64px;
  color: var(--text-3);
  margin: 0 auto var(--space-lg);
  display: block;
}

.blog-empty h2 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--text-heading);
  margin-bottom: var(--space-sm);
}