/* ============================================================
   RESEARCH BLOG
   ============================================================ */

.blog-wrap {
  max-width: 780px;
  margin: 30px auto;
  padding: 0 20px;
}

/* --- Header --- */
.blog-header {
  margin-bottom: 32px;
}

.blog-title {
  font-family: "Spectral", serif;
  font-size: 2rem;
  font-weight: 500;
  margin: 0 0 8px;
}

.blog-subtitle {
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.55;
  margin: 0;
  max-width: 600px;
}

/* --- Post list --- */
.blog-posts {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.blog-loading {
  font-style: italic;
  padding: 40px 0;
  text-align: center;
}

/* --- Post card (list view) --- */
.blog-card {
  display: block;
  padding: 18px 20px;
  border-radius: 12px;
  border: 1px solid transparent;
  text-decoration: none;
  color: inherit;
  transition: background 160ms ease, border-color 160ms ease;
}

.blog-card:hover {
  background: var(--card-bg);
  border-color: var(--card-border);
}

.blog-card-title {
  font-family: "Spectral", serif;
  font-size: 1.15rem;
  font-weight: 500;
  margin: 0 0 4px;
}

.blog-card-date {
  font-size: 0.82rem;
  color: var(--muted);
}

.blog-card-tags {
  display: inline;
  margin-left: 10px;
}

.blog-card-tag {
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  text-transform: lowercase;
  letter-spacing: 0.02em;
}

.blog-card-snippet {
  font-size: 0.88rem;
  color: var(--muted);
  margin: 6px 0 0;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* --- Single post view --- */
.blog-post-nav {
  margin-bottom: 24px;
}

.back-button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  color: var(--accent);
  text-decoration: none;
}

.back-button:hover {
  text-decoration: underline;
}

.back-button-icon {
  font-size: 1.1rem;
}

.blog-post-header {
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--card-border);
}

.blog-post-title {
  font-family: "Spectral", serif;
  font-size: 1.8rem;
  font-weight: 500;
  margin: 0 0 10px;
  line-height: 1.3;
}

.blog-post-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.blog-post-date {
  font-size: 0.85rem;
  color: var(--muted);
}

.blog-post-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.blog-post-tag {
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  text-transform: lowercase;
  letter-spacing: 0.02em;
}

/* --- Post body (rendered markdown) --- */
.blog-post-body {
  font-family: "Spectral", serif;
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text);
}

.blog-post-body h2 {
  font-size: 1.35rem;
  font-weight: 500;
  margin: 2em 0 0.6em;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--card-border);
}

.blog-post-body h3 {
  font-size: 1.12rem;
  font-weight: 500;
  margin: 1.5em 0 0.5em;
}

.blog-post-body p {
  margin: 0 0 1em;
}

.blog-post-body ol,
.blog-post-body ul {
  margin: 0 0 1em 1.4em;
  padding: 0;
}

.blog-post-body li {
  margin-bottom: 0.3em;
}

.blog-post-body strong {
  font-weight: 600;
}

.blog-post-body em {
  font-style: italic;
}

.blog-post-body a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: rgba(13, 148, 136, 0.3);
  text-underline-offset: 2px;
}

.blog-post-body a:hover {
  text-decoration-color: var(--accent);
}

/* --- Code blocks (Lean, etc.) --- */
.blog-post-body pre {
  background: var(--bg-accent);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 16px 18px;
  overflow-x: auto;
  font-family: "Fira Code", "Cascadia Code", "Consolas", monospace;
  font-size: 0.85rem;
  line-height: 1.55;
  margin: 0 0 1.2em;
}

.blog-post-body code {
  font-family: "Fira Code", "Cascadia Code", "Consolas", monospace;
  font-size: 0.88em;
  background: var(--accent-soft);
  padding: 1px 5px;
  border-radius: 4px;
}

.blog-post-body pre code {
  background: none;
  padding: 0;
  border-radius: 0;
  font-size: 1em;
}

/* Lean language label */
.blog-post-body pre[data-lang]::before {
  content: attr(data-lang);
  display: block;
  font-family: "Inter", sans-serif;
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--card-border);
}

/* --- KaTeX display math --- */
.blog-post-body .katex-display {
  margin: 1.2em 0;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 4px 0;
}

/* --- Blockquotes --- */
.blog-post-body blockquote {
  border-left: 3px solid var(--accent);
  margin: 0 0 1em;
  padding: 0.4em 0 0.4em 1.2em;
  color: var(--muted);
  font-style: italic;
}

/* --- Horizontal rule --- */
.blog-post-body hr {
  border: none;
  border-top: 1px solid var(--card-border);
  margin: 2em 0;
}

/* --- Empty state --- */
.blog-empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--muted);
  font-style: italic;
}

/* --- Responsive --- */
@media (max-width: 600px) {
  .blog-wrap {
    padding: 0 14px;
    margin: 16px auto;
  }

  .blog-title {
    font-size: 1.5rem;
  }

  .blog-post-title {
    font-size: 1.4rem;
  }

  .blog-post-body {
    font-size: 0.98rem;
  }

  .blog-post-body pre {
    font-size: 0.78rem;
    padding: 12px 14px;
  }
}