/* ========================================
   VCG QLD v2 — Blog Page Styles
   Styles specific to blog.html and blog-post.html
   ======================================== */

/* ========================================
   1. HERO
   ======================================== */
.blog-hero {
  position: relative;
  background: var(--lg-hero-bg);
  text-align: center;
  overflow: hidden;
}

.blog-hero-content {
  position: relative;
  z-index: var(--z-raised);
  max-width: 700px;
  margin: 0 auto;
}

.blog-hero-sub {
  font-size: var(--text-body-lg);
  color: var(--lg-hero-text-sub);
  line-height: var(--lh-prose);
  max-width: 480px;
  margin: 0 auto;
}

/* ========================================
   1b. BACK LINK (blog-post.html hero)
   ======================================== */
.blog-back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  font-size: var(--text-sm-plus);
  font-weight: 500;
  color: var(--lg-hero-text-sub);
  margin-bottom: var(--space-md);
  transition: color var(--ease-fast);
}

.blog-back-link:hover {
  color: var(--lg-hero-text);
  opacity: 1;
}

.blog-back-link svg {
  width: var(--icon-inline);
  height: var(--icon-inline);
}

/* ========================================
   2. FILTER BAR — Liquid Glass capsule
   ======================================== */
.blog-filters {
  display: flex;
  justify-content: center;
  padding: var(--space-sm) var(--space-page-x) 0;
  background: none;
  position: relative;
  z-index: var(--z-raised);
  margin-top: var(--gap-card);
}

.blog-filters-inner {
  display: inline-flex;
  align-items: center;
  gap: var(--gap-filter);
  padding: var(--padding-filter-bar);
  border-radius: var(--radius-button);
  background: var(--glass-white-15);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-white-25);
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.blog-filters-inner::-webkit-scrollbar {
  display: none;
}

.blog-filter {
  position: relative;
  padding: var(--padding-filter-btn);
  border-radius: var(--radius-button);
  border: none;
  background: transparent;
  color: var(--glass-white-70);
  font-family: inherit;
  font-size: var(--text-sm-plus);
  font-weight: 600;
  text-transform: capitalize;   /* multi-word tags: "water quality" -> "Water Quality" (matches .blog-tag) */
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--ease-normal);
  flex-shrink: 0;
  z-index: var(--z-base);
}

.blog-filter:hover {
  color: var(--color-white);
  background: var(--glass-white-10);
}

.blog-filter.active {
  background: var(--glass-white-70);
  color: var(--color-primary);
  box-shadow: 0 1px 4px var(--shadow-tint-06), 0 4px 12px var(--shadow-tint-04);
}

.blog-filter.active:hover {
  background: var(--glass-white-80);
}

/* ========================================
   3. BLOG SECTION & GRID
   ======================================== */
.blog-section {
  background: var(--lg-section-bg);
  padding: var(--space-section-y) var(--space-page-x);
  min-height: 400px;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--gap-section);
}

/* ========================================
   4. BLOG CARD
   ======================================== */
.blog-card {
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--lg-r-lg);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  opacity: 0;
  transition: transform var(--ease-glass),
              box-shadow var(--ease-normal),
              border-color var(--ease-normal),
              background var(--ease-normal);
}

.blog-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--card-border-hover);
}

.blog-card-image {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: linear-gradient(135deg, var(--pd-image-glass-1) 0%, var(--pd-image-glass-2) 100%);
}

.blog-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--ease-slower);
}

.blog-card:hover .blog-card-image img {
  transform: scale(1.04);
}

.blog-card-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: var(--space-1-4) var(--space-1-5) var(--space-1-5);
}

.blog-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2xs);
  margin-bottom: var(--space-sm);
}

.blog-tag {
  display: inline-block;
  padding: var(--space-3xs) var(--space-sm);
  border-radius: var(--radius-button);
  background: var(--badge-bg);
  color: var(--color-primary);
  font-size: var(--text-2xs);
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: capitalize;
}

.blog-card-title {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
  line-height: var(--lh-h4);
  margin-bottom: var(--space-xs);
}

.blog-card-desc {
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
  line-height: var(--lh-body);
  margin-bottom: var(--space-1);
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-sm);
  border-top: 1px solid var(--border-light);
}

.blog-card-date {
  font-size: var(--text-xs-plus);
  color: var(--color-text-muted);
}

.blog-card-read {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  font-size: var(--text-xs-plus);
  font-weight: 600;
  color: var(--color-primary);
  transition: gap var(--ease-fast);
}

.blog-card:hover .blog-card-read {
  gap: var(--space-xs);
}

.blog-card-read svg {
  width: 16px;
  height: 16px;
}

/* ========================================
   5. BLOG POST SECTION (detail page)
   ======================================== */
.blog-post-section {
  background: var(--color-surface-light);
  padding: var(--space-section-y) var(--space-page-x);
}

/* Blog post body — solid card per Design System §09 Blog.
   (legal-prose stays glass; blog posts stay solid for max reading contrast) */
.blog-post {
  max-width: 760px;
  margin: 0 auto;
  padding: 2.5rem;
  background: var(--color-surface);
  border: var(--hairline);
  border-radius: var(--r-sheet);
  box-shadow: var(--shadow-2);
}

@media (max-width: 768px) {
  .blog-post {
    padding: 1.5rem;
  }
}

/* Post hero image */
.blog-post-hero-image {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--lg-r-lg);
  margin-bottom: var(--space-2xl);
  background: linear-gradient(135deg, var(--pd-image-glass-1) 0%, var(--pd-image-glass-2) 100%);
}

.blog-post-hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Post meta row */
.blog-post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

.blog-post-author {
  font-size: var(--text-xs-plus);
  font-weight: 600;
  color: var(--color-text);
}

.blog-post-date {
  font-size: var(--text-xs-plus);
  color: var(--color-text-muted);
}

.blog-post-meta-divider {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-text-muted);
  flex-shrink: 0;
}

.blog-post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2xs);
}

/* ========================================
   6. BLOG POST PROSE (rendered HTML content)
   ======================================== */
.blog-post-content {
  /* Article body — content surface, no blur (content is never glass). */
  background: var(--lg-surface);
  border: var(--lg-border);
  border-radius: var(--lg-r-lg);
  box-shadow: var(--lg-shadow);
  padding: var(--space-3);
  position: relative;
  overflow: hidden;
}

.blog-post-content h2 {
  font-size: var(--text-md);
  font-weight: 700;
  color: var(--color-text);
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.01em;
  line-height: var(--lh-h3);
}

.blog-post-content h2:first-child {
  margin-top: 0;
}

.blog-post-content p {
  font-size: var(--text-body);
  line-height: var(--lh-reading);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.blog-post-content p:last-child {
  margin-bottom: 0;
}

.blog-post-content ul {
  list-style: none;
  margin-bottom: var(--space-md);
  padding-left: 0;
}

.blog-post-content ul li {
  position: relative;
  padding-left: var(--space-1-8);
  font-size: var(--text-body);
  line-height: var(--lh-reading);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
}

.blog-post-content ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
}

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

.blog-post-content a {
  color: var(--color-primary);
  font-weight: 500;
  transition: color var(--ease-fast);
}

.blog-post-content a:hover {
  color: var(--color-deep);
  opacity: 1;
}

/* ---- Post References block ---- */
.blog-post-sources {
  margin-top: var(--space-2xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}
.blog-post-sources h2 {
  font-size: var(--text-lg);
  color: var(--color-text);
  margin-bottom: var(--space-md);
  letter-spacing: -0.01em;
  line-height: var(--lh-h3);
}
.blog-post-sources-list {
  margin: 0;
  padding-left: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
.blog-post-sources-list li {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: var(--lh-normal);
}
.blog-post-sources-list a {
  color: var(--color-primary);
  text-decoration: none;
  word-break: break-word;
}
.blog-post-sources-list a:hover { text-decoration: underline; }
.blog-post-source-date { color: var(--color-text-muted); }

/* ========================================
   7. EMPTY STATE
   ======================================== */
.blog-empty {
  /* The empty state renders INSIDE .blog-grid — span every column or it
     sits in the first cell (read as left-aligned on desktop). */
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--space-4) var(--space-page-x);
}

.blog-empty-icon {
  width: 64px;
  height: 64px;
  color: var(--color-text-muted);
  opacity: 0.4;
  margin: 0 auto var(--gap-card);
  display: block;
}

.blog-empty h3 {
  font-size: var(--text-lg);
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.blog-empty p {
  font-size: var(--text-body);
  color: var(--color-text-muted);
  max-width: 400px;
  margin: 0 auto;
}

/* Scroll to top — styles in global.css */

/* ========================================
   9. RESPONSIVE
   ======================================== */
@media (max-width: 768px) {
  .blog-hero {
    padding: var(--lg-hero-pad-top-m) var(--lg-hero-pad-x-m) var(--lg-hero-pad-bottom-m);
  }

  .blog-filters {
    padding: var(--space-xs) var(--space-page-x-m);
    overflow: hidden;
  }

  .blog-filters-inner {
    gap: var(--gap-filter-m);
    padding: var(--gap-filter-m);
    max-width: 100%;
  }

  .blog-filter {
    padding: var(--padding-filter-btn-m);
    font-size: var(--text-xs-plus);
  }

  .blog-section {
    padding: var(--space-xl) var(--space-page-x-m) var(--space-4);
  }

  .blog-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin: 0 auto;
  }

  .blog-post-section {
    padding: var(--space-xl) var(--space-page-x-m) var(--space-4);
  }

  .blog-post-content {
    padding: var(--space-xl);
  }

  .blog-post-content h2 {
    margin-top: var(--space-xl);
  }
}

@media (max-width: 480px) {
  .blog-hero {
    padding: calc(var(--nav-height) + 2rem) var(--space-page-x-sm) 2rem;
  }


  .blog-filters {
    padding: var(--space-xs) var(--space-sm);
  }

  .blog-filters-inner {
    gap: var(--gap-filter-sm);
    padding: var(--gap-filter-sm);
  }

  .blog-filter {
    padding: var(--padding-filter-btn-sm);
    font-size: var(--text-xs);
  }

  .blog-section {
    padding: var(--space-1-5) var(--space-page-x-sm) var(--space-3);
  }

  .blog-post-section {
    padding: var(--space-1-5) var(--space-page-x-sm) var(--space-3);
  }

  .blog-post-content {
    padding: var(--space-1-5);
  }

  .blog-post-content p,
  .blog-post-content ul li {
    font-size: var(--text-sm-plus);
  }
}

/* ========================================
   10. ACCESSIBILITY
   ======================================== */
@media (prefers-reduced-motion: reduce) {
  .blog-card,
  .blog-filter {
    transition: none;
  }

  .blog-card:hover {
    transform: none;
  }

  .blog-card:hover .blog-card-image img {
    transform: none;
  }

  .blog-card {
    opacity: 1;
  }
}