/* blog.css — blog listing, article pages, research hub */
/* Brand prefix: qcvx- */

/* ─── Blog listing grid ─── */
.qcvx-blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--qcvx-grid-gap);
}

.qcvx-blog-card {
  background: var(--qcvx-bg-white);
  border: 1px solid var(--qcvx-border-light);
  border-top: 3px solid transparent;
  overflow: hidden;
  transition: border-color 0.2s;
  display: flex;
  flex-direction: column;
}

.qcvx-blog-card:hover { border-top-color: var(--qcvx-accent-aa-on-light); }

.qcvx-blog-card__img-wrap {
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--qcvx-bg-light-alt);
}

.qcvx-blog-card__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.qcvx-blog-card__body {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.qcvx-blog-card__meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.qcvx-blog-card__date {
  font-family: var(--qcvx-font-mono);
  font-size: 0.72rem;
  color: var(--qcvx-fg-light-muted);
}

.qcvx-blog-card__tag {
  font-family: var(--qcvx-font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--qcvx-accent-aa-on-light);
  background: rgba(0, 122, 101, 0.08);
  border: 1px solid rgba(0, 122, 101, 0.2);
  padding: 0.15rem 0.5rem;
}

.qcvx-blog-card__title {
  font-family: var(--qcvx-font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--qcvx-fg-light-primary);
  line-height: 1.35;
  margin-bottom: 0.5rem;
  flex: 1;
}

.qcvx-blog-card__title a {
  color: inherit;
  text-decoration: none;
}
.qcvx-blog-card__title a:hover {
  color: var(--qcvx-accent-aa-on-light);
  text-decoration: none;
}

.qcvx-blog-card__excerpt {
  font-size: 0.85rem;
  color: var(--qcvx-fg-light-muted);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.qcvx-blog-card__read-more {
  font-family: var(--qcvx-font-mono);
  font-size: 0.78rem;
  color: var(--qcvx-accent-aa-on-light);
  text-decoration: none;
  margin-top: auto;
}
.qcvx-blog-card__read-more:hover { color: var(--qcvx-accent-teal); text-decoration: none; }

/* ─── Topic tag filter bar ─── */
.qcvx-tag-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-block: 1.5rem;
}

.qcvx-tag-btn {
  font-family: var(--qcvx-font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.3rem 0.9rem;
  background: var(--qcvx-bg-light-alt);
  border: 1px solid var(--qcvx-border-light);
  color: var(--qcvx-fg-light-secondary);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.qcvx-tag-btn:hover,
.qcvx-tag-btn.is-active {
  background: var(--qcvx-accent-aa-on-light);
  color: #fff;
  border-color: var(--qcvx-accent-aa-on-light);
}

/* ─── Blog article page ─── */
.qcvx-article-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 4rem;
  align-items: start;
}

.qcvx-article-header {
  padding-top: calc(var(--qcvx-nav-height) + 3rem);
  padding-bottom: 3rem;
  background: var(--qcvx-bg-light);
}

.qcvx-article-header__inner {
  max-width: var(--qcvx-container-max);
  margin: 0 auto;
  padding-inline: var(--qcvx-container-px);
}

.qcvx-article-header__meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.qcvx-article-header__date {
  font-family: var(--qcvx-font-mono);
  font-size: 0.8rem;
  color: var(--qcvx-fg-light-muted);
}

.qcvx-article-header__tag {
  font-family: var(--qcvx-font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--qcvx-accent-aa-on-light);
  background: rgba(0, 122, 101, 0.08);
  border: 1px solid rgba(0, 122, 101, 0.2);
  padding: 0.2rem 0.6rem;
}

.qcvx-article-header__title {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-family: var(--qcvx-font-heading);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--qcvx-fg-light-primary);
  margin-bottom: 1rem;
  max-width: 860px;
}

.qcvx-article-header__lede {
  font-size: 1.1rem;
  color: var(--qcvx-fg-light-secondary);
  line-height: 1.65;
  max-width: 720px;
  margin-bottom: 0;
}

/* Article cover image — separate rule, must NOT share with card img */
.qcvx-blog-article__cover {
  width: 100%;
  height: auto;
  display: block;
  margin-bottom: 2.5rem;
  border: 1px solid var(--qcvx-border-light);
  /* No aspect-ratio, no object-fit: cover — natural dimensions preserved */
}

/* ─── Article sidebar ─── */
.qcvx-article-sidebar {
  position: sticky;
  top: calc(var(--qcvx-nav-height) + 2rem);
}

.qcvx-article-sidebar__section {
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--qcvx-border-light);
}

.qcvx-article-sidebar__head {
  font-family: var(--qcvx-font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--qcvx-fg-light-muted);
  margin-bottom: 0.75rem;
  display: block;
}

.qcvx-toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.qcvx-toc-list a {
  font-size: 0.85rem;
  color: var(--qcvx-fg-light-secondary);
  text-decoration: none;
  line-height: 1.4;
  display: block;
  padding: 0.1rem 0;
  border-left: 2px solid transparent;
  padding-left: 0.5rem;
  transition: color 0.15s, border-color 0.15s;
}
.qcvx-toc-list a:hover {
  color: var(--qcvx-accent-aa-on-light);
  border-left-color: var(--qcvx-accent-aa-on-light);
  text-decoration: none;
}

/* ─── Related posts (3-card, below article) ─── */
.qcvx-related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--qcvx-grid-gap);
}

.qcvx-related-card {
  background: var(--qcvx-bg-white);
  border: 1px solid var(--qcvx-border-light);
  border-top: 2px solid var(--qcvx-border-light);
  overflow: hidden;
}

.qcvx-related-card:hover { border-top-color: var(--qcvx-accent-aa-on-light); }

.qcvx-related-card__img-wrap {
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--qcvx-bg-light-alt);
}

.qcvx-related-card__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.qcvx-related-card__body { padding: 1.25rem; }

.qcvx-related-card__date {
  font-family: var(--qcvx-font-mono);
  font-size: 0.7rem;
  color: var(--qcvx-fg-light-muted);
  display: block;
  margin-bottom: 0.4rem;
}

.qcvx-related-card__title {
  font-family: var(--qcvx-font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--qcvx-fg-light-primary);
  line-height: 1.35;
}

.qcvx-related-card__title a { color: inherit; text-decoration: none; }
.qcvx-related-card__title a:hover { color: var(--qcvx-accent-aa-on-light); text-decoration: none; }

/* ─── Responsive ─── */
@media (max-width: 1200px) {
  .qcvx-blog-grid { grid-template-columns: repeat(2, 1fr); }
  .qcvx-article-layout { grid-template-columns: 1fr; }
  .qcvx-article-sidebar { position: static; }
  .qcvx-related-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .qcvx-blog-grid { grid-template-columns: 1fr; }
  .qcvx-related-grid { grid-template-columns: 1fr; }
}

/* ─── Blog article page (qcvx-blog-article__* naming — article-template + gen_blog articles) ─── */
.qcvx-blog-article__header {
  background: var(--qcvx-bg-light);
  padding: calc(var(--qcvx-nav-height) + 2.5rem) 0 2.5rem;
}
.qcvx-blog-article__meta {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 1.1rem;
  flex-wrap: wrap;
}
.qcvx-blog-article__topic {
  display: inline-block;
  font-family: var(--qcvx-font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--qcvx-accent-aa-on-light);
  background: rgba(0, 122, 101, 0.08);
  border: 1px solid rgba(0, 122, 101, 0.2);
  padding: 0.2rem 0.6rem;
}
.qcvx-blog-article__date {
  font-family: var(--qcvx-font-mono);
  font-size: 0.8rem;
  color: var(--qcvx-fg-light-muted);
}
.qcvx-blog-article__author {
  font-family: var(--qcvx-font-mono);
  font-size: 0.8rem;
  color: var(--qcvx-fg-light-muted);
}
.qcvx-blog-article__author::before {
  content: '— ';
}
.qcvx-blog-article__title {
  font-family: var(--qcvx-font-heading);
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--qcvx-fg-light-primary);
  margin: 0 0 1rem;
  max-width: 860px;
}
.qcvx-blog-article__lede {
  font-size: 1.1rem;
  color: var(--qcvx-fg-light-secondary);
  line-height: 1.65;
  max-width: 720px;
  margin: 0;
}
.qcvx-blog-article__cover-wrap {
  margin: 0 0 0;
  padding: 0;
}
.qcvx-blog-article__layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 4rem;
  align-items: start;
  padding-top: 3rem;
  padding-bottom: 5rem;
}
.qcvx-blog-article__body {
  min-width: 0;
  color: var(--qcvx-fg-light-secondary);
  line-height: 1.75;
  font-size: 1rem;
}
.qcvx-blog-article__body h2 {
  font-family: var(--qcvx-font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--qcvx-fg-light-primary);
  margin: 2.5rem 0 0.85rem;
  border-bottom: 1px solid var(--qcvx-border-light);
  padding-bottom: 0.5rem;
}
.qcvx-blog-article__body h3 {
  font-family: var(--qcvx-font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--qcvx-fg-light-primary);
  margin: 2rem 0 0.6rem;
}
.qcvx-blog-article__body p { margin: 0 0 1rem; }
.qcvx-blog-article__body ul,
.qcvx-blog-article__body ol {
  padding-left: 1.5rem;
  margin: 0 0 1rem;
}
.qcvx-blog-article__body li { margin-bottom: 0.4rem; }
.qcvx-blog-article__body a {
  color: var(--qcvx-accent-aa-on-light);
  text-decoration: underline;
}
.qcvx-blog-article__body pre {
  background: #0E1623;
  border: 1px solid var(--qcvx-border-dark);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin: 1.25rem 0;
  font-family: var(--qcvx-font-mono);
  font-size: 0.83rem;
  line-height: 1.45;
  color: #C8D8E8;
}
.qcvx-blog-article__body code {
  font-family: var(--qcvx-font-mono);
  font-size: 0.88em;
  background: rgba(0,122,101,0.08);
  color: var(--qcvx-accent-aa-on-light);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}
.qcvx-blog-article__body pre code {
  background: transparent;
  color: inherit;
  padding: 0;
  font-size: inherit;
}
.qcvx-blog-article__sidebar {
  position: sticky;
  top: calc(var(--qcvx-nav-height) + 2rem);
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
.qcvx-blog-toc { border: 1px solid var(--qcvx-border-light); border-radius: 8px; padding: 1.25rem; }
.qcvx-blog-toc__head { font-family: var(--qcvx-font-mono); font-size: 0.7rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--qcvx-fg-light-muted); margin: 0 0 0.75rem; display: block; }
.qcvx-blog-toc__list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 0.4rem; }
.qcvx-blog-toc__list a { font-size: 0.85rem; color: var(--qcvx-fg-light-secondary); text-decoration: none; line-height: 1.4; display: block; padding: 0.1rem 0 0.1rem 0.5rem; border-left: 2px solid transparent; }
.qcvx-blog-toc__list a:hover { color: var(--qcvx-accent-aa-on-light); border-left-color: var(--qcvx-accent-aa-on-light); }
.qcvx-blog-cta { background: var(--qcvx-bg-dark); border-radius: 8px; padding: 1.5rem; }
.qcvx-blog-cta__head { font-family: var(--qcvx-font-heading); font-size: 0.95rem; font-weight: 600; color: var(--qcvx-fg-dark-primary); margin: 0 0 0.5rem; }
.qcvx-blog-cta__body { color: var(--qcvx-fg-dark-secondary); font-size: 0.88rem; line-height: 1.6; margin: 0 0 1.1rem; }
.qcvx-blog-cta .qcvx-btn--primary { width: 100%; text-align: center; }

/* ─── Article wrapper (gen_blog articles) ─── */
.qcvx-blog-article { display: block; }

/* ─── TOC inside article sidebar (gen_blog naming) ─── */
.qcvx-blog-article__toc { border: 1px solid var(--qcvx-border-light); border-radius: 8px; padding: 1.25rem; margin-bottom: 1.5rem; }
.qcvx-blog-article__toc-title { font-family: var(--qcvx-font-mono); font-size: 0.7rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--qcvx-fg-light-muted); margin: 0 0 0.75rem; display: block; }
.qcvx-blog-toc__link { font-size: 0.85rem; color: var(--qcvx-fg-light-secondary); text-decoration: none; line-height: 1.4; display: block; padding: 0.1rem 0 0.1rem 0.5rem; border-left: 2px solid transparent; }
.qcvx-blog-toc__link:hover { color: var(--qcvx-accent-aa-on-light); border-left-color: var(--qcvx-accent-aa-on-light); }

/* ─── CTA box inside article sidebar (gen_blog naming) ─── */
.qcvx-blog-article__cta-box { background: var(--qcvx-bg-dark); border-radius: 8px; padding: 1.5rem; }
.qcvx-blog-article__cta-box h3 { font-family: var(--qcvx-font-heading); font-size: 0.97rem; font-weight: 600; color: var(--qcvx-fg-dark-primary); margin: 0 0 0.5rem; }
.qcvx-blog-article__cta-box p { color: var(--qcvx-fg-dark-secondary); font-size: 0.88rem; line-height: 1.6; margin: 0 0 1.1rem; }
.qcvx-blog-article__cta-box .qcvx-btn--primary { width: 100%; text-align: center; }

@media (max-width: 1200px) {
  .qcvx-blog-article__layout { grid-template-columns: 1fr; gap: 2.5rem; }
  .qcvx-blog-article__sidebar { position: static; flex-direction: row; flex-wrap: wrap; }
  .qcvx-blog-toc { flex: 1 1 280px; }
  .qcvx-blog-cta { flex: 0 0 280px; }
}
@media (max-width: 768px) {
  .qcvx-blog-article__sidebar { flex-direction: column; }
  .qcvx-blog-toc, .qcvx-blog-cta { flex: none; }
}