/* blog.css
 * Styles for /blog (index) and /blog/{slug} (post pages).
 * Loads AFTER case_study_directory_agentic.css and reuses its design
 * tokens (--csa-*) plus the shared .csa-hero / .csa-cta-panel components.
 * Class prefix: .blog-*
 */

/* Hero subtitle: wider than the 760px case-study default so the intro
 * sentence fits on one line (blog pages only -- this file isn't loaded
 * by the case study directory). */
.csa-hero__subtitle { max-width: 980px; }

/* ---------- Index: post list ---------- */
.blog-list {
  max-width: 880px;
  margin: 0 auto;
  display: grid;
  gap: 18px;
}

.blog-card.is-hidden { display: none !important; }

.blog-card {
  display: flex;
  background: var(--csa-surface);
  border: 1px solid var(--csa-border);
  border-radius: var(--csa-radius);
  box-shadow: var(--csa-shadow-sm);
  overflow: hidden;
  transition: transform 160ms var(--csa-ease), box-shadow 160ms var(--csa-ease), border-color 160ms var(--csa-ease);
}
.blog-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--csa-shadow-md);
  border-color: var(--csa-border-strong);
}

.blog-card__thumb {
  flex: 0 0 224px;
  display: flex;
  align-items: stretch;
  text-decoration: none;
}
.blog-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.blog-card__thumb-ph {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background:
    radial-gradient(360px 200px at 30% 0%, rgba(34, 211, 238, 0.22), transparent 70%),
    linear-gradient(135deg, #1d4ed8 0%, #2563eb 55%, #0891b2 100%);
}
.blog-card__thumb-code {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #fff;
}
.blog-card__thumb-brand {
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.75);
}

.blog-card__body {
  flex: 1;
  min-width: 0;
  padding: 20px 24px 18px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.blog-card__meta,
.blog-article__meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 12.5px;
  color: var(--csa-text-subtle);
}
.blog-card__meta { margin-bottom: 8px; }

.blog-tag {
  display: inline-block;
  padding: 2px 9px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--csa-primary-strong);
  background: var(--csa-primary-soft);
  border: 1px solid rgba(10, 132, 255, 0.22);
  border-radius: 999px;
}

.blog-card__title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.4;
}
.blog-card__title a {
  color: var(--csa-text);
  text-decoration: none;
}
.blog-card__title a:hover { color: var(--csa-primary-strong); }

.blog-card__excerpt {
  margin: 0 0 14px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--csa-text-muted);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex-grow: 1;
}

.blog-card__more {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 7px 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--csa-primary);
  background: var(--csa-primary-soft);
  border: 1px solid rgba(10, 132, 255, 0.22);
  border-radius: 999px;
  text-decoration: none;
  transition: background 140ms var(--csa-ease), color 140ms var(--csa-ease), transform 140ms var(--csa-ease);
}
.blog-card__more:hover {
  background: var(--csa-primary);
  color: #fff;
  text-decoration: none;
  transform: translateY(-1px);
}

/* ---------- Index: category filter tabs ---------- */
.blog-tabs {
  max-width: 880px;
  margin: 0 auto 20px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}
.blog-tab {
  padding: 8px 20px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--csa-text-muted);
  background: var(--csa-surface);
  border: 1px solid var(--csa-border);
  border-radius: 999px;
  cursor: pointer;
  transition: background 140ms var(--csa-ease), color 140ms var(--csa-ease), border-color 140ms var(--csa-ease);
  font-family: var(--csa-font);
}
.blog-tab:hover {
  color: var(--csa-primary-strong);
  border-color: rgba(10, 132, 255, 0.45);
}
.blog-tab.is-active {
  color: #fff;
  background: linear-gradient(180deg, #3b82f6 0%, var(--csa-primary-dark) 100%);
  border-color: transparent;
}

/* ---------- Category chips ---------- */
.blog-chip {
  display: inline-block;
  padding: 2px 10px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.03em;
  border-radius: 999px;
  border: 1px solid transparent;
}
.blog-chip--case {
  color: var(--csa-primary-strong);
  background: var(--csa-primary-soft);
  border-color: rgba(10, 132, 255, 0.22);
}
.blog-chip--feature {
  color: #0e7490;
  background: rgba(8, 145, 178, 0.10);
  border-color: rgba(8, 145, 178, 0.25);
}
.blog-chip--course {
  color: #6d28d9;
  background: rgba(124, 58, 237, 0.10);
  border-color: rgba(124, 58, 237, 0.25);
}
.blog-chip--news {
  color: #475569;
  background: rgba(71, 85, 105, 0.10);
  border-color: rgba(71, 85, 105, 0.25);
}

/* ---------- Index: quiet CTA strip ---------- */
/* Deliberately subdued — the posts are the focus of /blog. */
.blog-cta {
  max-width: 880px;
  margin: 26px auto 0;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px 16px;
  padding: 15px 22px;
  background: var(--csa-surface-tint);
  border: 1px solid var(--csa-border);
  border-radius: var(--csa-radius);
  font-size: 13.5px;
  color: var(--csa-text-muted);
}

.blog-cta__btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 8px 18px;
  font-size: 13.5px;
  font-weight: 600;
  border-radius: 8px;
  text-decoration: none;
  white-space: nowrap;
  transition: background 140ms var(--csa-ease), color 140ms var(--csa-ease), border-color 140ms var(--csa-ease);
}
.blog-cta__btn--primary {
  color: #fff;
  background: var(--csa-primary-strong);
  border: 1px solid transparent;
}
.blog-cta__btn--primary:hover {
  color: #fff;
  background: var(--csa-primary-dark);
  text-decoration: none;
}
.blog-cta__btn--ghost {
  color: var(--csa-primary-strong);
  background: transparent;
  border: 1px solid rgba(10, 132, 255, 0.40);
}
.blog-cta__btn--ghost:hover {
  color: #fff;
  background: var(--csa-primary-strong);
  border-color: var(--csa-primary-strong);
  text-decoration: none;
}

.blog-cta__signin {
  font-size: 12.5px;
  color: var(--csa-text-subtle);
}
.blog-cta__signin a { color: var(--csa-primary); font-weight: 600; }
.blog-cta__signin a:hover { color: var(--csa-primary-strong); text-decoration: underline; }

/* ---------- Post page ---------- */
/* The post page reuses case_study_agentic.css (cs-top-banner / cs-body /
 * cs-title / CTA button restyles) so it matches /case_study/{symbol}
 * exactly. Only the date line below is blog-specific. */
.csa-page .cs-body .blog-post-meta {
  margin: -6px 0 22px;
  font-size: 13px;
  color: var(--csa-text-subtle);
}
.csa-page .cs-body .blog-post-meta a {
  color: var(--csa-primary);
  font-weight: 600;
  text-decoration: none;
}
.csa-page .cs-body .blog-post-meta a:hover {
  color: var(--csa-primary-strong);
  text-decoration: underline;
}

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .blog-card { flex-direction: column; }
  .blog-card__thumb { flex-basis: auto; height: 150px; }
  .blog-card__body { padding: 16px 18px 16px; }
}