/* ============================================================
   Blog styles — MD3 tokens, dark/light theme-aware
   ============================================================ */

/* ── Blog List Page ─────────────────────────────────────────── */
.blog-page { padding: 1.5rem 0 5rem; }

.blog-page-header { margin-bottom: 2.5rem; }
.blog-page-title  { margin-bottom: 0.4rem; }
.blog-page-subtitle { font-size: 0.95rem; color: var(--md-on-surface-variant); }

/* ── Featured section ───────────────────────────────────────── */
.featured-section { margin-bottom: 3rem; }

.section-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--md-on-surface-variant);
  margin-bottom: 1rem;
}
.section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--md-outline-variant);
}

.featured-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

/* Featured card */
.featured-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  background: var(--md-surface-container);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-xl);
  padding: 1.5rem;
  text-decoration: none;
  color: inherit;
  position: relative;
  overflow: hidden;
  transition: transform var(--md-motion-standard), box-shadow var(--md-motion-standard),
              border-color var(--md-motion-standard);
}
.featured-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--md-primary), var(--md-secondary));
  border-radius: var(--md-shape-xl) var(--md-shape-xl) 0 0;
}
.featured-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(124, 111, 205, 0.2);
  border-color: var(--md-primary);
  color: inherit;
}

.featured-card-tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}
.card-tag {
  display: inline-flex;
  align-items: center;
  padding: 0.18rem 0.55rem;
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  border-radius: var(--md-shape-full);
  font-size: 0.7rem;
  font-weight: 600;
  text-decoration: none;
  transition: background var(--md-motion-quick), color var(--md-motion-quick);
}
.card-tag:hover {
  background: var(--md-primary);
  color: var(--md-on-primary);
}

.featured-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--md-on-surface);
  line-height: 1.35;
  margin: 0;
}
.featured-card:hover .featured-card-title { color: var(--md-primary); }

.featured-card-excerpt {
  font-size: 0.86rem;
  color: var(--md-on-surface-variant);
  line-height: 1.6;
  margin: 0;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.featured-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--md-on-surface-variant);
  padding-top: 0.75rem;
  border-top: 1px solid var(--md-outline-variant);
  margin-top: auto;
}
.card-read-more {
  font-weight: 600;
  color: var(--md-primary);
  font-size: 0.78rem;
}
.featured-card:hover .card-read-more { color: var(--md-secondary); }

/* ── Tag filter bar ─────────────────────────────────────────── */
.tag-filter-section { margin-bottom: 1.75rem; }

.tag-filter-label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--md-on-surface-variant);
  margin-bottom: 0.6rem;
}

.tag-filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
}

.tag-filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.3rem 0.75rem;
  border-radius: var(--md-shape-full);
  font-size: 0.78rem;
  font-weight: 500;
  background: var(--md-surface-container-high);
  color: var(--md-on-surface-variant);
  border: 1px solid var(--md-outline-variant);
  cursor: pointer;
  transition: background var(--md-motion-quick), color var(--md-motion-quick),
              border-color var(--md-motion-quick), transform var(--md-motion-quick);
  user-select: none;
}
.tag-filter-chip:hover {
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  border-color: var(--md-primary);
  transform: translateY(-1px);
}
.tag-filter-chip.active {
  background: var(--md-primary);
  color: var(--md-on-primary);
  border-color: var(--md-primary);
}
.tag-filter-chip .chip-count {
  font-size: 0.68rem;
  opacity: 0.75;
  font-family: var(--md-font-mono);
}

/* ── Post list ──────────────────────────────────────────────── */
.all-posts-section { }

.post-list { list-style: none; padding: 0; }

.post-list-item {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--md-outline-variant);
  text-decoration: none;
  color: inherit;
  transition: opacity var(--md-motion-quick);
}
.post-list-item:last-child { border-bottom: none; }
.post-list-item:hover { opacity: 0.85; }
.post-list-item:hover .post-list-title { color: var(--md-primary); }

/* Hide filtered-out items */
.post-list-item.hidden { display: none; }

.post-list-date-col {
  flex-shrink: 0;
  width: 80px;
  text-align: right;
  padding-top: 0.2rem;
}
.post-list-date {
  font-size: 0.75rem;
  color: var(--md-on-surface-variant);
  font-family: var(--md-font-mono);
  line-height: 1.4;
}
.post-list-date .date-year {
  display: block;
  font-size: 0.68rem;
  opacity: 0.65;
}

.post-list-body { flex: 1; min-width: 0; }

.post-list-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--md-on-surface);
  margin: 0 0 0.35rem;
  line-height: 1.35;
  transition: color var(--md-motion-quick);
}

.post-list-excerpt {
  font-size: 0.845rem;
  color: var(--md-on-surface-variant);
  line-height: 1.6;
  margin: 0 0 0.6rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-list-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
}

/* No results */
.no-posts-msg {
  text-align: center;
  padding: 2.5rem 1rem;
  color: var(--md-on-surface-variant);
  font-size: 0.95rem;
}

/* ── Post Detail Layout ─────────────────────────────────────── */
.post-article { padding: 1.5rem 0 5rem; max-width: 720px; margin: 0 auto; }

.post-back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  color: var(--md-on-surface-variant);
  text-decoration: none;
  margin-bottom: 1.75rem;
  transition: color var(--md-motion-quick);
}
.post-back-link:hover { color: var(--md-primary); }

.post-header { margin-bottom: 2rem; }

.post-header-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.9rem;
}
.post-tag-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.65rem;
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  border-radius: var(--md-shape-full);
  font-size: 0.72rem;
  font-weight: 600;
  text-decoration: none;
  transition: background var(--md-motion-quick), color var(--md-motion-quick);
}
.post-tag-badge:hover {
  background: var(--md-primary);
  color: var(--md-on-primary);
}

.post-main-title {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.2;
  color: var(--md-on-surface);
  margin: 0 0 1rem;
}

.post-meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1rem;
  font-size: 0.82rem;
  color: var(--md-on-surface-variant);
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--md-outline-variant);
}
.post-meta-sep { opacity: 0.35; }
.post-reading-time { font-style: italic; }

/* Divider */
.post-header-divider {
  border: none;
  border-top: 1px solid var(--md-outline-variant);
  margin: 0;
}

/* ── Post Content typography ─────────────────────────────────── */
.post-content {
  margin-top: 2rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--md-on-surface-variant);
}

.post-content h2,
.post-content h3,
.post-content h4 {
  color: var(--md-on-surface);
  margin: 2.5rem 0 0.75rem;
}
.post-content h2 {
  font-size: 1.45rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--md-outline-variant);
}
.post-content h3 { font-size: 1.15rem; }

.post-content p { margin-bottom: 1.25rem; }

.post-content a {
  color: var(--md-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.post-content a:hover { color: var(--md-secondary); }

.post-content ul, .post-content ol {
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}
.post-content li { margin-bottom: 0.35rem; }

.post-content strong { color: var(--md-on-surface); }

/* Inline code */
.post-content code {
  background: var(--md-surface-container-high);
  color: var(--md-secondary);
  padding: 0.15em 0.45em;
  border-radius: var(--md-shape-xs);
  font-size: 0.875em;
  font-family: var(--md-font-mono);
}

/* Code blocks */
.post-content pre {
  background: var(--md-surface-container-highest);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-md);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  font-size: 0.875rem;
  line-height: 1.65;
}
.post-content pre code {
  background: none;
  color: var(--md-on-surface);
  padding: 0;
  font-size: inherit;
}

/* Tables */
.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}
.post-content th {
  background: var(--md-surface-container-high);
  color: var(--md-on-surface);
  font-weight: 600;
  padding: 0.6rem 1rem;
  text-align: left;
  border-bottom: 2px solid var(--md-outline);
}
.post-content td {
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--md-outline-variant);
  color: var(--md-on-surface-variant);
}
.post-content tr:last-child td { border-bottom: none; }

/* Blockquote */
.post-content blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  background: var(--md-surface-container-high);
  border-left: 3px solid var(--md-primary);
  border-radius: 0 var(--md-shape-md) var(--md-shape-md) 0;
  color: var(--md-on-surface-variant);
  font-style: italic;
}

/* Highlight blocks (Jekyll {% highlight %}) */
.post-content .highlight {
  background: var(--md-surface-container-highest) !important;
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-md);
  margin: 1.5rem 0;
  overflow: hidden;
}
.post-content .highlight pre {
  background: transparent;
  border: none;
  margin: 0;
  padding: 1.25rem 1.5rem;
}

/* ── Post footer ─────────────────────────────────────────────── */
.post-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--md-outline-variant);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.post-footer-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
}
.post-footer-tags-label {
  font-size: 0.8rem;
  color: var(--md-on-surface-variant);
  margin-right: 0.25rem;
}

.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.post-nav-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1rem 1.25rem;
  background: var(--md-surface-container);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-lg);
  text-decoration: none;
  color: inherit;
  transition: border-color var(--md-motion-quick), background var(--md-motion-quick);
}
.post-nav-item:hover {
  border-color: var(--md-primary);
  background: var(--md-surface-container-high);
  color: inherit;
}
.post-nav-item.next { text-align: right; }
.post-nav-direction {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--md-primary);
}
.post-nav-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--md-on-surface);
  line-height: 1.35;
}

@media (max-width: 600px) {
  .post-article { padding: 1rem 0 4rem; }
  .post-nav { grid-template-columns: 1fr; }
  .featured-grid { grid-template-columns: 1fr; }
  .post-list-date-col { display: none; }
}