/* ============================================================
   Blog Styles
   ============================================================ */

/* --- Layout --- */

.blog-layout {
  display: grid;
  grid-template-columns: 1fr min(680px, calc(100% - 2rem)) 1fr;
  gap: 0;
  min-height: calc(100vh - var(--header-height));
  padding-top: calc(var(--header-height) + 2rem);
}

.blog-layout > * {
  grid-column: 2;
}

.blog-toc {
  grid-column: 3;
  position: sticky;
  top: calc(var(--header-height) + 2rem);
  align-self: start;
  padding: 0 1.5rem;
  max-height: calc(100vh - var(--header-height) - 4rem);
  overflow-y: auto;
  font-size: 0.8125rem;
}

.blog-toc .toc-nav h4 {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin: 0 0 0.75rem;
}

.blog-toc .toc-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.blog-toc .toc-nav li {
  margin-bottom: 0.25rem;
}

.blog-toc .toc-nav a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 0.15s;
  display: block;
  padding: 0.125rem 0;
}

.blog-toc .toc-nav a:hover {
  color: var(--color-text);
}

.blog-toc .toc-nav a.active {
  color: var(--color-accent);
  font-weight: 500;
}

.blog-toc .toc-level-3 {
  padding-left: 0.75rem;
}

/* --- Mobile TOC --- */

.blog-toc-toggle {
  display: none;
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 100;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-bg-nav);
  color: var(--color-text-secondary);
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  align-items: center;
  justify-content: center;
}

.blog-toc-mobile {
  display: none;
}

@media (max-width: 1023px) {
  .blog-layout {
    grid-template-columns: 1fr min(680px, calc(100% - 2rem)) 1fr;
  }

  .blog-toc {
    display: none;
  }

  .blog-toc-toggle {
    display: flex;
  }

  .blog-toc-mobile {
    display: block;
    position: fixed;
    bottom: 5rem;
    right: 1.5rem;
    z-index: 99;
    width: min(320px, calc(100vw - 3rem));
    max-height: 60vh;
    overflow-y: auto;
    background: var(--color-bg-nav);
    border: 1px solid var(--color-border);
    border-radius: 0.75rem;
    padding: 1rem 1.25rem;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    font-size: 0.8125rem;
  }

  .blog-toc-mobile[hidden] {
    display: none;
  }

  .blog-toc-mobile .toc-nav h4 {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin: 0 0 0.75rem;
  }

  .blog-toc-mobile .toc-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
  }

  .blog-toc-mobile .toc-nav li {
    margin-bottom: 0.25rem;
  }

  .blog-toc-mobile .toc-nav a {
    color: var(--color-text-secondary);
    text-decoration: none;
    display: block;
    padding: 0.25rem 0;
  }

  .blog-toc-mobile .toc-nav a:hover {
    color: var(--color-text);
  }

  .blog-toc-mobile .toc-level-3 {
    padding-left: 0.75rem;
  }
}

/* --- Header area --- */

.blog-header {
  margin-bottom: 2.5rem;
}

.blog-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.tag-pill {
  display: inline-block;
  background: var(--color-accent-low);
  color: var(--color-accent-high);
  border-radius: 9999px;
  padding: 0.15rem 0.7rem;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  text-transform: capitalize;
}

.blog-title {
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 1rem;
  color: var(--color-text);
}

.blog-meta-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
}

.blog-author-inline {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.blog-author-inline img {
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  object-fit: cover;
}

.blog-author-inline span {
  font-weight: 500;
  color: var(--color-text);
}

.blog-meta-sep {
  color: var(--color-text-muted);
  opacity: 0.5;
}

.blog-featured-image {
  width: 100%;
  border-radius: 0.75rem;
  object-fit: cover;
  max-height: 380px;
}

/* --- Content --- */

.blog-content {
  line-height: 1.8;
  font-size: 1rem;
  color: var(--color-text);
}

.blog-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 2.5rem 0 1rem;
  color: var(--color-text);
}

.blog-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 2rem 0 0.75rem;
  color: var(--color-text);
}

.blog-content p {
  margin: 0 0 1.25rem;
}

.blog-content a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.blog-content a:hover {
  color: var(--color-text);
}

.blog-content img {
  max-width: 100%;
  border-radius: 0.5rem;
  margin: 1.5rem 0;
}

.blog-content ul,
.blog-content ol {
  margin: 0 0 1.25rem;
  padding-left: 1.5rem;
}

.blog-content li {
  margin-bottom: 0.35rem;
}

.blog-content blockquote {
  margin: 1.5rem 0;
  padding: 0.75rem 1.25rem;
  border-left: 3px solid var(--color-accent);
  background: var(--color-gray-6);
  border-radius: 0 0.375rem 0.375rem 0;
  color: var(--color-text-secondary);
}

.blog-content pre {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  border-radius: 0.5rem;
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.6;
}

.blog-content code {
  font-family: var(--font-mono);
  font-size: 0.875em;
}

.blog-content hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2.5rem 0;
}

/* --- Author bio card --- */

.blog-author-card {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.blog-author-card img {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.blog-author-card-info strong {
  display: block;
  font-size: 1rem;
  color: var(--color-text);
  margin-bottom: 0.25rem;
}

.blog-author-card-info p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* --- Related posts --- */

.blog-related {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
  padding-bottom: 3rem;
}

.blog-related h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 1.25rem;
  color: var(--color-text);
}

.blog-related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
}

.blog-related-card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--color-border);
  border-radius: 0.625rem;
  overflow: hidden;
  text-decoration: none;
  color: var(--color-text);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.blog-related-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  text-decoration: none;
}

.blog-related-card-body {
  padding: 1rem;
}

.blog-related-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.5rem;
}

.blog-related-card-tags .tag-pill {
  font-size: 0.65rem;
  padding: 0.1rem 0.5rem;
}

.blog-related-card h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin: 0 0 0.35rem;
  line-height: 1.3;
}

.blog-related-card time {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* --- Blog Index --- */

.blog-index-container {
  max-width: 780px;
  margin: 0 auto;
  padding: calc(var(--header-height) + 2rem) 1rem 3rem;
}

.blog-index-header {
  margin-bottom: 2.5rem;
}

.blog-index-header h1 {
  font-size: 2rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
  color: var(--color-text);
}

.blog-index-header p {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.6;
}

.blog-index-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* --- Blog Card (index) --- */

.blog-card {
  display: flex;
  gap: 1.25rem;
  padding: 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.blog-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.blog-card-image {
  flex-shrink: 0;
  width: 160px;
  align-self: stretch;
  border-radius: 0.5rem;
  overflow: hidden;
}

.blog-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.blog-card-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.blog-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.5rem;
}

.blog-card h2 {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0 0 0.35rem;
  line-height: 1.3;
}

.blog-card h2 a {
  color: var(--color-text);
  text-decoration: none;
}

.blog-card h2 a:hover {
  color: var(--color-accent);
}

.blog-card-excerpt {
  margin: 0 0 0.5rem;
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--color-text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-card-footer {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-top: auto;
}

.blog-card-avatar {
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  object-fit: cover;
}

.blog-card-footer .blog-card-sep {
  opacity: 0.5;
}

@media (max-width: 640px) {
  .blog-card {
    flex-direction: column;
  }

  .blog-card-image {
    width: 100%;
    height: 140px;
  }

  .blog-title {
    font-size: 1.75rem;
  }
}