/* ============================================================
   Blog styles — index + post pages
   Reuses tokens from style.css (--bg, --accent, --gradient, ...)
   ============================================================ */

.blog-page main {
  padding-top: calc(var(--header-h) + 2rem);
  padding-bottom: 4rem;
}

/* ===== Blog index ===== */
.blog-hero {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 3rem;
}

.blog-hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin: 0.75rem 0;
}

.blog-hero p {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 560px;
  margin: 0.5rem auto 0;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.blog-card {
  display: flex;
  flex-direction: column;
  padding: 1.75rem;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}

.blog-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--gradient);
  opacity: 0;
  transition: opacity var(--transition);
  z-index: 0;
  pointer-events: none;
}

.blog-card > * { position: relative; z-index: 1; }

.blog-card:hover {
  transform: translateY(-6px);
  border-color: rgba(110, 231, 183, 0.4);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5);
}

.blog-card:hover::before { opacity: 0.05; }

.blog-card-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  padding: 0.3rem 0.7rem;
  border: 1px solid rgba(110, 231, 183, 0.3);
  border-radius: 999px;
  margin-bottom: 1rem;
  align-self: flex-start;
}

.blog-card h2 {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-bottom: 0.75rem;
}

.blog-card h2 a {
  color: var(--text);
  transition: color var(--transition);
}

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

.blog-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.blog-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.blog-card-meta .read-more {
  color: var(--accent);
  font-weight: 600;
  font-family: var(--font-mono);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: gap var(--transition);
}

.blog-card:hover .read-more { gap: 0.6rem; }

/* ===== Blog post (article) ===== */
.blog-article {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.blog-post-header {
  margin-bottom: 2.5rem;
  text-align: center;
}

.blog-post-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  padding: 0.35rem 0.85rem;
  border: 1px solid rgba(110, 231, 183, 0.3);
  border-radius: 999px;
  margin-bottom: 1.25rem;
}

.blog-post-header h1 {
  font-size: clamp(2rem, 5.5vw, 3.25rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1rem;
}

.blog-post-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

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

.blog-post-meta i { color: var(--accent); }

.blog-post-body {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text);
}

.blog-post-body h2 {
  font-size: clamp(1.4rem, 3.5vw, 1.85rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin: 3rem 0 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.blog-post-body h3 {
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 2rem 0 0.75rem;
  color: var(--text);
}

.blog-post-body h4 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
  color: var(--accent);
  font-family: var(--font-mono);
}

.blog-post-body p {
  margin-bottom: 1.1rem;
  color: var(--text-muted);
}

.blog-post-body p strong { color: var(--text); }

.blog-post-body ul,
.blog-post-body ol {
  margin: 0.5rem 0 1.5rem 1.5rem;
  padding-left: 0.5rem;
}

.blog-post-body ul li,
.blog-post-body ol li {
  margin-bottom: 0.55rem;
  color: var(--text-muted);
  position: relative;
}

.blog-post-body ul li::marker { color: var(--accent); }
.blog-post-body ol li::marker { color: var(--accent); font-weight: 600; }

.blog-post-body strong { color: var(--text); font-weight: 600; }

.blog-post-body code:not(pre code) {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 0.15rem 0.45rem;
  background: rgba(110, 231, 183, 0.1);
  color: var(--accent);
  border-radius: 6px;
  border: 1px solid rgba(110, 231, 183, 0.2);
}

.blog-post-body pre {
  background: #0d0f17;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.4rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.6;
  position: relative;
}

.blog-post-body pre code {
  font-family: var(--font-mono);
  color: #e8eaef;
  background: transparent;
  padding: 0;
  border: none;
  white-space: pre;
}

/* Simple syntax tinting */
.blog-post-body pre .tok-kw { color: #c084fc; }
.blog-post-body pre .tok-str { color: #6ee7b7; }
.blog-post-body pre .tok-com { color: #6b7280; font-style: italic; }
.blog-post-body pre .tok-fn { color: #38bdf8; }
.blog-post-body pre .tok-num { color: #fbbf24; }
.blog-post-body pre .tok-type { color: #fb7185; }

.blog-post-body blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  border-left: 3px solid var(--accent);
  background: rgba(110, 231, 183, 0.06);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text);
  font-style: italic;
}

/* ===== Tables ===== */
.blog-post-body .table-wrap {
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.blog-post-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.blog-post-body th,
.blog-post-body td {
  padding: 0.7rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.blog-post-body th {
  background: rgba(255, 255, 255, 0.03);
  color: var(--accent);
  font-weight: 600;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.blog-post-body td {
  color: var(--text-muted);
}

.blog-post-body tr:last-child td { border-bottom: none; }

.blog-post-body tr:hover td { background: rgba(110, 231, 183, 0.03); }

/* ===== Mermaid diagram blocks ===== */
.blog-post-body .mermaid {
  background: #0d0f17;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 1.75rem 0;
  text-align: center;
  overflow-x: auto;
  font-family: var(--font);
  min-height: 80px;
}

.blog-post-body .mermaid svg {
  max-width: 100%;
  height: auto;
}

/* ===== Chapter cards (visual rhythm) ===== */
.blog-post-body .chapter {
  margin-top: 2.5rem;
}

.blog-post-body hr {
  border: none;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--border), transparent);
  margin: 3rem 0;
}

/* ===== Back to blog list ===== */
.blog-post-back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
  transition: color var(--transition), gap var(--transition);
}

.blog-post-back:hover {
  color: var(--accent);
  gap: 0.75rem;
}

/* ===== Bottom CTA on post ===== */
.blog-post-cta {
  margin-top: 4rem;
  padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-align: center;
  backdrop-filter: blur(12px);
}

.blog-post-cta h3 {
  font-size: 1.35rem;
  margin-bottom: 0.5rem;
}

.blog-post-cta p {
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.blog-post-cta-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== Responsive ===== */
@media (max-width: 720px) {
  .blog-grid { grid-template-columns: 1fr; }
  .blog-post-body { font-size: 1rem; }
  .blog-post-body pre { font-size: 0.78rem; padding: 1rem; }
  .blog-post-body .mermaid { padding: 0.75rem; }
}