/* ==========================================================================
   Pixel Architecture - Blog post styles
   Long-form reading, optimized typography, sidebar TOC, content blocks.
   ========================================================================== */

.post-hero {
  padding-top: calc(var(--pa-header-h) + clamp(2rem, 5vw, 4rem));
  padding-bottom: clamp(2rem, 4vw, 4rem);
  background: var(--pa-bg);
  position: relative; isolation: isolate;
}
.post-hero::before {
  content: ''; position: absolute; inset: 0;
  background: var(--pa-grad-aurora);
  pointer-events: none; z-index: -1;
}

.post-meta {
  display: flex; gap: var(--pa-space-3); flex-wrap: wrap;
  font-family: var(--pa-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--pa-text-soft);
  margin-bottom: var(--pa-space-5);
}
.post-meta .cat { color: var(--pa-teal); }

.post-title {
  font-size: var(--pa-fs-5xl);
  letter-spacing: -0.035em;
  line-height: 1.05;
  max-width: 22ch;
  margin-bottom: var(--pa-space-5);
}
.post-deck {
  font-size: var(--pa-fs-lg);
  line-height: 1.55;
  color: var(--pa-text-muted);
  max-width: 60ch;
}

.post-cover {
  aspect-ratio: 16 / 8;
  border-radius: var(--pa-r-xl);
  margin: var(--pa-space-6) 0;
  display: grid; place-items: center;
  color: #fff;
  font-family: var(--pa-font-display);
  font-weight: 700;
  font-size: 2rem;
  letter-spacing: -0.02em;
  position: relative; overflow: hidden;
  box-shadow: var(--pa-shadow-lg);
}
.post-cover::before {
  content: ''; position: absolute; inset: 0;
  background-image: linear-gradient(to right, rgba(255,255,255,0.04) 1px, transparent 1px),
                    linear-gradient(to bottom, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(ellipse at 50% 50%, #000 30%, transparent 70%);
}

.post-grid {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--pa-space-7);
  align-items: start;
}
@media (max-width: 980px) { .post-grid { grid-template-columns: 1fr; } }

.post-toc {
  position: sticky; top: calc(var(--pa-header-h) + 24px);
  font-size: 0.85rem;
}
@media (max-width: 980px) { .post-toc { position: static; } }
.post-toc h6 {
  font-family: var(--pa-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--pa-text-soft);
  margin-bottom: var(--pa-space-4);
}
.post-toc ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 0.4rem; border-left: 1px solid var(--pa-border); }
.post-toc a {
  display: block;
  padding: 0.4rem 0.85rem;
  color: var(--pa-text-muted);
  margin-left: -1px;
  border-left: 1px solid transparent;
  transition: all var(--pa-dur-base) var(--pa-ease);
}
.post-toc a:hover { color: var(--pa-slate); border-left-color: var(--pa-border-strong); }
.post-toc a.is-active { color: var(--pa-teal); border-left-color: var(--pa-teal); font-weight: 500; }

/* Article typography */
.post-body { max-width: 70ch; }
.post-body h2 {
  font-size: var(--pa-fs-2xl);
  margin-top: var(--pa-space-7);
  margin-bottom: var(--pa-space-4);
  letter-spacing: -0.02em;
  scroll-margin-top: calc(var(--pa-header-h) + 24px);
}
.post-body h2:first-child { margin-top: 0; }
.post-body h3 {
  font-size: var(--pa-fs-xl);
  margin-top: var(--pa-space-6);
  margin-bottom: var(--pa-space-3);
  letter-spacing: -0.01em;
  scroll-margin-top: calc(var(--pa-header-h) + 24px);
}
.post-body p { font-size: 1.0625rem; line-height: 1.75; color: var(--pa-text); margin: 0 0 var(--pa-space-4); }
.post-body p strong { color: var(--pa-slate); font-weight: 600; }
.post-body p em { color: var(--pa-teal-700); font-style: italic; }
.post-body a { color: var(--pa-teal); border-bottom: 1px solid currentColor; }
.post-body a:hover { color: var(--pa-teal-600); }
.post-body ul, .post-body ol { margin: 0 0 var(--pa-space-5); padding-left: 1.5rem; }
.post-body li { margin-bottom: 0.5rem; line-height: 1.65; font-size: 1.0625rem; }
.post-body blockquote {
  margin: var(--pa-space-6) 0;
  padding: var(--pa-space-4) var(--pa-space-5);
  background: var(--pa-bg-soft);
  border-left: 3px solid var(--pa-teal);
  border-radius: 0 var(--pa-r-md) var(--pa-r-md) 0;
  font-style: italic;
  font-size: 1.05rem;
  color: var(--pa-slate);
}
.post-body blockquote p:last-child { margin-bottom: 0; }
.post-body code {
  background: var(--pa-bg-soft);
  padding: 0.15em 0.4em;
  border-radius: var(--pa-r-xs);
  font-size: 0.92em;
  font-family: var(--pa-font-mono);
  color: var(--pa-teal-700);
}

.post-body .callout {
  padding: var(--pa-space-5) var(--pa-space-6);
  background: var(--pa-teal-100);
  border: 1px solid rgba(45,163,156,0.25);
  border-radius: var(--pa-r-md);
  margin: var(--pa-space-6) 0;
}
.post-body .callout strong { color: var(--pa-teal-700); display: block; margin-bottom: 0.4rem; font-family: var(--pa-font-display); }
.post-body .callout p:last-child { margin-bottom: 0; }
.post-body .callout--gold { background: var(--pa-gold-100); border-color: rgba(201,162,39,0.3); }
.post-body .callout--gold strong { color: var(--pa-gold-600); }

.post-body .stats-row {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--pa-space-4);
  margin: var(--pa-space-6) 0;
}
.post-body .stats-row .s { padding: 1rem 1.2rem; background: var(--pa-bg-soft); border-radius: var(--pa-r-md); border-left: 3px solid var(--pa-teal); }
.post-body .stats-row .s strong { display: block; font-family: var(--pa-font-display); font-size: 1.6rem; color: var(--pa-slate); letter-spacing: -0.02em; line-height: 1; }
.post-body .stats-row .s span { display: block; font-size: 0.82rem; color: var(--pa-text-muted); margin-top: 0.4rem; }

/* end-of-post CTA */
.post-cta {
  margin-top: var(--pa-space-8);
  padding: var(--pa-space-6);
  background: linear-gradient(135deg, #1B2A3A 0%, #1B5E5A 100%);
  color: #fff;
  border-radius: var(--pa-r-lg);
}
.post-cta h3 { color: #fff; margin-bottom: var(--pa-space-3); font-size: 1.35rem; }
.post-cta p { color: #C0CCD9; }

/* related posts */
.related {
  display: grid; gap: var(--pa-space-4);
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  margin-top: var(--pa-space-7);
}

/* Mobile typography tightening for long-form blog reading */
@media (max-width: 640px) {
  .post-cover { aspect-ratio: 16 / 10; font-size: 1.15rem; padding: var(--pa-space-5); text-align: center; }
  .post-title { font-size: clamp(1.85rem, 7vw, 2.6rem); line-height: 1.1; }
  .post-deck  { font-size: var(--pa-fs-base); }
  .post-body p, .post-body li { font-size: 1rem; line-height: 1.7; }
  .post-body blockquote { padding: var(--pa-space-3) var(--pa-space-4); font-size: 0.98rem; }
  .post-body .stats-row { grid-template-columns: 1fr; }
  .post-toc { font-size: 0.82rem; }
}
.related a {
  padding: var(--pa-space-5);
  background: var(--pa-bg-elevated);
  border: 1px solid var(--pa-border);
  border-radius: var(--pa-r-md);
  transition: transform var(--pa-dur-base) var(--pa-ease), box-shadow var(--pa-dur-base) var(--pa-ease);
}
.related a:hover { transform: translateY(-3px); box-shadow: var(--pa-shadow-sm); }
.related a strong { display: block; font-family: var(--pa-font-display); font-size: 1rem; color: var(--pa-slate); margin-bottom: 0.4rem; line-height: 1.3; }
.related a span { font-size: 0.82rem; color: var(--pa-text-muted); }