/* ═══════════════════════════════════════════════════
   BLOG LISTING PAGE
═══════════════════════════════════════════════════ */
.blog-page-section {
  min-height: 100vh;
  padding-top: calc(var(--nav-h) + 4rem);
  padding-bottom: 5rem;
}

/* ── Blog entry cards ─────────────────────────────── */
.blog-listing {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--rad);
  overflow: hidden;
  margin-top: 1.5rem;
}

.blog-entry {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background var(--t);
  position: relative;
  overflow: hidden;
}

.blog-entry::before {
  content: '';
  position: absolute; top: 0; left: 0; bottom: 0;
  width: 3px; background: var(--gradient);
  transform: scaleY(0); transform-origin: top;
  transition: transform 0.3s ease;
}

.blog-entry:last-child { border-bottom: none; }
.blog-entry:hover { background: var(--surface-2); }
.blog-entry:hover::before { transform: scaleY(1); }

.blog-entry-inner { padding: 2rem 2rem 2rem 2.25rem; }

.blog-entry-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.5rem;
}

.entry-number {
  font-family: var(--font-mono);
  font-size: 0.7rem; color: var(--accent);
  letter-spacing: 0.06em; flex-shrink: 0;
}

.entry-arrow {
  color: var(--text-3);
  transition: color var(--t), transform var(--t);
  flex-shrink: 0;
}
.entry-arrow svg { width: 16px; height: 16px; }
.blog-entry:hover .entry-arrow { color: var(--accent); transform: translate(3px, -3px); }

.blog-entry-title {
  font-family: var(--font-display);
  font-size: 1.1rem; font-weight: 700;
  color: var(--text); line-height: 1.35;
  letter-spacing: -0.02em; margin-bottom: 0.5rem;
}

.blog-entry-excerpt {
  font-size: 0.87rem; color: var(--text-2);
  line-height: 1.75; margin-bottom: 1rem;
}

.blog-entry-footer {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; flex-wrap: wrap;
}

.blog-entry-meta {
  display: flex; gap: 1rem; align-items: center;
  font-family: var(--font-mono); font-size: 0.66rem;
  color: var(--text-3); letter-spacing: 0.05em;
}

.meta-sep { color: var(--border-2); }

.entry-tags { display: flex; gap: 0.4rem; flex-wrap: wrap; }

.entry-tag {
  font-family: var(--font-mono); font-size: 0.62rem;
  padding: 0.2rem 0.55rem; border: 1px solid var(--border);
  background: var(--surface-3); color: var(--text-3);
  border-radius: 5px; letter-spacing: 0.03em;
}

/* ═══════════════════════════════════════════════════
   BLOG POST PAGE
═══════════════════════════════════════════════════ */
.blog-post-page { width: 100%; }

/* Header */
.post-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding-top: calc(var(--nav-h) + 2.5rem);
  padding-bottom: 3rem;
}

.post-header-inner {
  max-width: 800px; margin: 0 auto; padding: 0 2rem;
}

.post-breadcrumb {
  display: flex; align-items: center; gap: 0.4rem;
  font-family: var(--font-mono); font-size: 0.68rem;
  color: var(--text-3); letter-spacing: 0.05em; margin-bottom: 1.75rem;
}
.post-breadcrumb a { color: var(--accent); transition: opacity var(--t); }
.post-breadcrumb a:hover { opacity: 0.8; }
.post-breadcrumb svg { width: 12px; height: 12px; }

.post-category-tag {
  display: inline-block; margin-bottom: 1rem;
  font-family: var(--font-mono); font-size: 0.68rem;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--accent); padding: 0.3rem 0.85rem;
  border: 1px solid rgba(124,108,248,0.35);
  background: var(--accent-dim); border-radius: 100px;
}

.post-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4.5vw, 2.75rem);
  font-weight: 800; letter-spacing: -0.03em;
  color: var(--text); line-height: 1.15;
  margin-bottom: 1.25rem;
}

.post-meta-row {
  display: flex; align-items: center; gap: 1.25rem;
  flex-wrap: wrap; margin-bottom: 1.5rem;
}

.post-meta-item {
  display: flex; align-items: center; gap: 0.4rem;
  font-family: var(--font-mono); font-size: 0.68rem;
  color: var(--text-3); letter-spacing: 0.05em;
}
.post-meta-item svg { width: 13px; height: 13px; }

.paper-info {
  margin-top: 1.5rem; padding: 1.1rem 1.35rem;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--rad-sm); font-size: 0.88rem;
  color: var(--text-2); line-height: 1.8;
}
.paper-info p + p { margin-top: 0.65rem; }
.paper-info strong { color: var(--text); font-weight: 600; }

/* Body content */
.post-body {
  max-width: 800px; margin: 0 auto;
  padding: 3.5rem 2rem 5rem;
  line-height: 1.85; color: var(--text);
}

/* Reduce vertical spacing for sections inside a blog post (override global `section` spacing) */
.post-body section {
  padding: 2rem 0;
}

/* Back link */
.back-link {
  display: inline-flex; align-items: center; gap: 0.4rem;
  margin-bottom: 2.5rem; color: var(--text-3);
  font-family: var(--font-mono); font-size: 0.78rem;
  letter-spacing: 0.04em; transition: color var(--t);
}
.back-link svg { width: 14px; height: 14px; }
.back-link:hover { color: var(--accent); }

/* TOC */
.toc {
  background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--rad);
  padding: 1.5rem; margin: 1.25rem 0 1.75rem;
}

.toc-label {
  font-family: var(--font-mono); font-size: 0.65rem;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--text-3); margin-bottom: 1rem;
  display: flex; align-items: center; gap: 0.5rem;
}
.toc-label svg { width: 13px; height: 13px; }

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

.toc-list li {
  margin: 0.35rem 0;
  padding-left: 0.75rem;
  border-left: 2px solid var(--border);
  transition: border-color var(--t);
}
.toc-list li:hover { border-color: var(--accent); }

.toc-list a {
  font-size: 0.87rem; color: var(--text-2);
  transition: color var(--t);
}
.toc-list a:hover { color: var(--accent); }

/* Blog headings */
.post-body h2 {
  font-family: var(--font-display);
  font-size: 1.55rem; font-weight: 700;
  letter-spacing: -0.025em; color: var(--text);
  margin-top: 3rem; margin-bottom: 0.9rem;
  padding-bottom: 0.7rem; border-bottom: 1px solid var(--border);
  line-height: 1.2;
}

.post-body h2:first-of-type { margin-top: 0; }

.post-body h3 {
  font-size: 1.1rem; font-weight: 600;
  color: var(--text); margin-top: 2rem; margin-bottom: 0.65rem;
}

.post-body h4 {
  font-size: 0.97rem; font-weight: 600;
  color: var(--text-2); margin-top: 1.25rem; margin-bottom: 0.4rem;
}

.post-body p { margin-bottom: 1rem; color: var(--text-2); font-weight: 400; }

.post-body ul, .post-body ol {
  margin-bottom: 1.25rem; padding-left: 1.5rem;
}
.post-body li { margin-bottom: 0.45rem; color: var(--text-2); }
.post-body strong { font-weight: 600; color: var(--text); }

/* Blog images */
.blog-figure {
  margin: 2.5rem 0; text-align: center;
}
.blog-figure img {
  max-width: 100%; border: 1px solid var(--border);
  border-radius: var(--rad); background: var(--surface);
  box-shadow: var(--shadow-sm);
}
.blog-figcaption {
  margin-top: 0.7rem; font-family: var(--font-mono);
  font-size: 0.67rem; color: var(--text-3);
  letter-spacing: 0.06em; text-align: center;
}

/* Tables */
.post-body .data-table {
  width: 100%; border-collapse: collapse;
  margin: 2rem 0; border: 1px solid var(--border);
  border-radius: var(--rad); overflow: hidden;
  font-size: 0.875rem;
}

.post-body .data-table thead { background: var(--surface-2); }

.post-body .data-table th {
  padding: 0.85rem 1rem; text-align: left;
  font-weight: 600; color: var(--text);
  border-right: 1px solid var(--border);
  font-family: var(--font-mono); font-size: 0.75rem;
  letter-spacing: 0.04em;
}
.post-body .data-table th:last-child { border-right: none; }

.post-body .data-table td {
  padding: 0.85rem 1rem; border-bottom: 1px solid var(--border);
  border-right: 1px solid var(--border); color: var(--text-2);
  font-size: 0.875rem; line-height: 1.6;
}
.post-body .data-table td:last-child { border-right: none; }
.post-body .data-table tbody tr:last-child td { border-bottom: none; }
.post-body .data-table tbody tr:hover { background: var(--surface); }

/* Code */
.post-body code {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 5px; padding: 0.15rem 0.45rem;
  font-family: var(--font-mono); font-size: 0.875em; color: var(--text);
}

.post-body pre {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--rad-sm); padding: 1.25rem; overflow-x: auto; margin: 1.5rem 0;
}
.post-body pre code { background: none; border: none; padding: 0; font-size: 0.85rem; line-height: 1.6; }

/* MathJax */
.post-body .mjx-container { overflow-x: auto; overflow-y: hidden; margin: 1.25rem 0; padding: 0.25rem 0; }

/* Bottom nav */
.post-footer {
  margin-top: 4rem; padding-top: 2rem;
  border-top: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}

/* ── Responsive ──────────────────────────────────── */
@media (max-width: 768px) {
  .post-body { padding: 2.5rem 1.25rem 4rem; }
  .post-title { font-size: 1.55rem; }
  .post-body h2 { font-size: 1.3rem; }
  .blog-entry-inner { padding: 1.5rem 1.5rem 1.5rem 1.75rem; }
  .post-body .data-table th, .post-body .data-table td { padding: 0.7rem 0.6rem; font-size: 0.82rem; }
}

@media (max-width: 480px) {
  .post-body { padding: 2rem 1rem 3rem; font-size: 0.95rem; }
  .post-title { font-size: 1.3rem; }
}