/* ═══════════════════════════════════════════════════════
   BuildAIModels — blog.css
   Blog layer on the "Study Hall" design system (global.css).
   Loads AFTER global.css; only post/index-specific styles here.
═══════════════════════════════════════════════════════ */

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 28px; }
.wrap.narrow { max-width: 760px; }

/* ── Breadcrumb ── */
.crumb { padding: 26px 0 0; font-size: 13px; color: var(--muted); }
.crumb ol { list-style: none; display: flex; gap: 8px; }
.crumb li + li::before { content: '/'; margin-right: 8px; color: var(--line); }
.crumb a { color: var(--muted); text-decoration: none; }
.crumb a:hover { color: var(--ink); }

/* ── Post header ── */
.post-head { padding: 34px 0 8px; }
.post-head .tag { margin-bottom: 14px; }
.post-head h1 {
  font-size: clamp(30px, 4.4vw, 42px); font-weight: 800;
  letter-spacing: -1.2px; line-height: 1.12; margin-bottom: 16px;
}
.post-meta { display: flex; gap: 18px; font-size: 13px; color: var(--muted); }

/* ── Prose ── */
.prose { font-size: 15.5px; line-height: 1.75; color: var(--ink); }
.prose p { margin: 0 0 18px; }
.prose h2 {
  font-size: 24px; font-weight: 800; letter-spacing: -.6px;
  margin: 44px 0 14px; line-height: 1.25;
}
.prose h3 { font-size: 17px; font-weight: 700; margin: 28px 0 10px; }
.prose a { color: var(--blue); text-decoration: none; border-bottom: 1px solid var(--blue-soft); }
.prose a:hover { border-bottom-color: var(--blue); }
.prose strong { font-weight: 700; }
.prose ul, .prose ol { margin: 0 0 18px 22px; }
.prose li { margin-bottom: 6px; }
.prose .key { color: var(--ink); }

/* ── Comparison / spec table ── */
.table-wrap {
  overflow-x: auto; margin: 26px 0;
  border: 1px solid var(--line); border-radius: 14px;
  background: var(--card); box-shadow: var(--shadow);
}
.table-wrap table { width: 100%; border-collapse: collapse; font-size: 14px; }
.table-wrap th {
  font-family: var(--font-display); font-weight: 800; text-align: left;
  padding: 12px 16px; background: var(--bg);
  font-size: 11.5px; text-transform: uppercase; letter-spacing: .5px;
  color: var(--muted); border-bottom: 1px solid var(--line); white-space: nowrap;
}
.table-wrap td { padding: 12px 16px; border-bottom: 1px solid var(--line); color: var(--muted); vertical-align: top; }
.table-wrap tr:last-child td { border-bottom: none; }
.table-wrap td:first-child { font-weight: 600; color: var(--ink); }
.ok-cell { color: var(--green); font-weight: 700; }
.warn-cell { color: var(--coral); font-weight: 700; }

/* ── Note callout ── */
.note {
  border-left: 3px solid var(--yellow); background: var(--card);
  border-radius: 0 12px 12px 0; padding: 16px 20px; margin: 26px 0;
  font-size: 14.5px; color: var(--muted); box-shadow: var(--shadow);
}
.note strong { color: var(--ink); }

/* ── Bar chart (CSS-only) ── */
.chart {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 22px 24px 18px; margin: 26px 0;
}
.chart figcaption {
  font-family: var(--font-display); font-weight: 700; font-size: 14px;
  margin-bottom: 4px; color: var(--ink);
}
.chart .chart-note { font-size: 12.5px; color: var(--muted); margin-bottom: 16px; }
.chart .crow {
  display: grid; grid-template-columns: 132px 1fr 78px;
  align-items: center; gap: 12px; margin-bottom: 12px; font-size: 13px;
}
.chart .crow:last-child { margin-bottom: 2px; }
.chart .crow .clabel { color: var(--muted); font-weight: 600; line-height: 1.3; }
.chart .crow .cval { font-family: var(--font-display); font-weight: 800; color: var(--ink); text-align: right; }
.chart .cbar { height: 14px; border-radius: 99px; background: var(--line); overflow: hidden; }
.chart .cbar i { display: block; height: 100%; border-radius: 99px; background: var(--green); }
.chart .cbar.warn i { background: var(--coral); }
.chart .cbar.act i { background: var(--yellow); }
@media (max-width: 560px) { .chart .crow { grid-template-columns: 100px 1fr 64px; } }

/* ── Quick answer (the extractable block AI engines lift) ── */
.qa {
  background: var(--yellow-soft);
  border: 1px solid var(--yellow);
  border-radius: var(--radius);
  padding: 22px 26px; margin: 28px 0 34px;
}
.qa .mono-label { display: block; margin-bottom: 8px; }
.qa p { font-size: 15.5px; line-height: 1.7; margin: 0; }

/* ── FAQ ── */
.post-faq { margin: 52px 0 0; }
.post-faq h2 { font-size: 24px; font-weight: 800; letter-spacing: -.6px; margin-bottom: 18px; }
.post-faq details {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 14px; margin-bottom: 10px; box-shadow: var(--shadow);
  padding: 0 22px;
}
.post-faq summary {
  cursor: pointer; list-style: none;
  padding: 17px 0; font-family: var(--font-display);
  font-weight: 700; font-size: 15px; position: relative; padding-right: 28px;
}
.post-faq summary::-webkit-details-marker { display: none; }
.post-faq summary::after {
  content: '+'; position: absolute; right: 2px; top: 14px;
  font-size: 20px; color: var(--muted); transition: transform .2s;
}
.post-faq details[open] summary::after { transform: rotate(45deg); }
.post-faq details p { font-size: 14px; color: var(--muted); line-height: 1.7; padding: 0 0 18px; }
.post-faq details a { color: var(--blue); text-decoration: none; }

/* ── CTA panel ── */
.post-cta {
  background: var(--card); border: 2px solid var(--yellow);
  border-radius: 20px; box-shadow: var(--shadow);
  padding: 36px 34px; margin: 52px 0 0; text-align: center;
}
.post-cta h2 { font-size: 26px; font-weight: 800; letter-spacing: -.8px; margin: 10px 0 12px; }
.post-cta p { color: var(--muted); font-size: 14.5px; max-width: 52ch; margin: 0 auto 22px; }
.cta-row { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ── Related posts ── */
.related { margin: 52px 0 72px; }
.related h2 { font-size: 20px; font-weight: 800; letter-spacing: -.5px; margin-bottom: 16px; }
.rel-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.rel-card {
  display: flex; flex-direction: column; gap: 6px;
  background: var(--card); border: 1px solid var(--line);
  border-radius: 16px; padding: 20px 22px; box-shadow: var(--shadow);
  text-decoration: none; color: var(--ink); transition: border-color .15s, transform .15s;
}
.rel-card:hover { border-color: var(--yellow); transform: translateY(-2px); }
.rel-card strong { font-family: var(--font-display); font-weight: 700; font-size: 15px; }
.rel-card span:last-child { font-size: 13px; color: var(--muted); }

/* ── Blog index ── */
.blog-head { padding: 64px 0 10px; }
.blog-head h1 { font-size: clamp(32px, 4.6vw, 46px); font-weight: 800; letter-spacing: -1.3px; margin: 16px 0 12px; }
.blog-head p { color: var(--muted); max-width: 56ch; font-size: 16px; }
.post-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; padding: 34px 0 72px; }
.post-card {
  display: flex; flex-direction: column; gap: 10px;
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 26px 26px 22px; box-shadow: var(--shadow);
  text-decoration: none; color: var(--ink); transition: border-color .15s, transform .15s;
}
.post-card:hover { border-color: var(--yellow); transform: translateY(-2px); }
.post-card h2 { font-size: 18px; font-weight: 800; letter-spacing: -.4px; line-height: 1.3; }
.post-card p { font-size: 13.5px; color: var(--muted); flex: 1; }
.post-card .post-meta { font-size: 12.5px; }

/* ── Footer ── */
.foot-in { display: flex; justify-content: space-between; align-items: center; gap: 16px; max-width: 1120px; margin: 0 auto; flex-wrap: wrap; }
.foot-links { display: flex; gap: 20px; align-items: center; }
.made-by { display: inline-flex; align-items: center; gap: 7px; color: var(--muted); text-decoration: none; transition: color .15s; }
.made-by:hover { color: var(--ink); }
.made-by .mark { width: 15px; height: 15px; flex-shrink: 0; }
.made-by strong { font-weight: 700; }

@media (max-width: 760px) {
  .rel-grid, .post-grid { grid-template-columns: 1fr; }
  nav .nav-link { display: none; }
}