/* ============================================================
   SMART WEB DESIGN — Blog CSS
   ============================================================ */

/* ---- Blog Grid ---- */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

@media (max-width: 1024px) { .blog-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px)  { .blog-grid { grid-template-columns: 1fr; } }

/* ---- Blog Card ---- */
.blog-card {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-card);
  transition: transform var(--ease-smooth), border-color var(--ease-base), box-shadow var(--ease-smooth);
  text-decoration: none;
}
.blog-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-border-accent);
  box-shadow: var(--shadow-lg), var(--shadow-accent);
}
.blog-card:hover .blog-card__img img {
  transform: scale(1.04);
}

.blog-card__img {
  aspect-ratio: 16/9;
  overflow: hidden;
  position: relative;
}
.blog-card__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.blog-card__category {
  position: absolute;
  top: var(--space-4);
  left: var(--space-4);
  padding: 0.25rem 0.75rem;
  background: var(--color-accent);
  color: #0a0a0f;
  font-size: var(--text-xs);
  font-weight: 700;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.blog-card__body {
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  flex: 1;
}

.blog-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}
.blog-card__meta i { font-size: 0.85rem; }
.blog-card__meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.blog-card__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text-primary);
  transition: color var(--ease-fast);
}
.blog-card:hover .blog-card__title { color: var(--color-accent); }

.blog-card__excerpt {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  flex: 1;
}

.blog-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-sm);
}

.blog-card__author {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 500;
  color: var(--color-text-secondary);
}
.blog-card__author img {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
}

.blog-card__read-more {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  color: var(--color-accent);
  font-weight: 600;
  transition: gap var(--ease-base);
}
.blog-card:hover .blog-card__read-more { gap: var(--space-2); }

/* ---- Featured Blog Card (large, first post) ---- */
.blog-featured {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  box-shadow: var(--shadow-card);
  margin-bottom: var(--space-12);
  text-decoration: none;
  transition: border-color var(--ease-base), box-shadow var(--ease-smooth);
}
.blog-featured:hover {
  border-color: var(--color-border-accent);
  box-shadow: var(--shadow-lg), var(--shadow-accent);
}
.blog-featured:hover .blog-featured__img img { transform: scale(1.04); }

.blog-featured__img {
  overflow: hidden;
  aspect-ratio: auto;
  min-height: 360px;
}
.blog-featured__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.blog-featured__body {
  padding: var(--space-10);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-4);
}

.blog-featured__tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.25rem 0.875rem;
  background: var(--color-accent-dim);
  border: 1px solid var(--color-border-accent);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  width: fit-content;
}

.blog-featured__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-text-primary);
  transition: color var(--ease-fast);
}
.blog-featured:hover .blog-featured__title { color: var(--color-accent); }

.blog-featured__excerpt {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.75;
}

.blog-featured__meta {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}
.blog-featured__meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

@media (max-width: 900px) {
  .blog-featured { grid-template-columns: 1fr; }
  .blog-featured__img { min-height: 240px; }
  .blog-featured__body { padding: var(--space-8); }
}

/* ---- Blog Category Filter Tabs ---- */
.blog-filters {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-10);
}

.blog-filter-btn {
  padding: 0.4rem 1.1rem;
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  background: transparent;
  cursor: pointer;
  transition: all var(--ease-base);
}
.blog-filter-btn:hover {
  border-color: var(--color-border-accent);
  color: var(--color-accent);
}
.blog-filter-btn.active {
  background: var(--gradient-accent);
  border-color: transparent;
  color: #fff;
}

/* ---- Blog Post (Article) Page ---- */
.article-hero {
  padding-top: calc(var(--section-pad-y) + 6rem);
  padding-bottom: var(--space-16);
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
}
.article-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle 800px at 50% 50%, rgba(0,212,255,0.05), transparent 70%);
  pointer-events: none;
}

.article-hero__inner {
  max-width: 760px;
  margin-inline: auto;
  text-align: center;
  position: relative;
  z-index: 1;
}

.article-hero__tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.25rem 0.875rem;
  background: var(--color-accent-dim);
  border: 1px solid var(--color-border-accent);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-5);
}

.article-hero__title {
  font-size: var(--text-5xl);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: var(--space-6);
}

.article-hero__meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-6);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  flex-wrap: wrap;
}
.article-hero__meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.article-hero__img {
  margin-top: var(--space-12);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  aspect-ratio: 16/7;
}
.article-hero__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---- Article Content ---- */
.article-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--space-16);
  align-items: start;
}

@media (max-width: 960px) { .article-layout { grid-template-columns: 1fr; } }

.article-content {
  font-size: var(--text-base);
  line-height: 1.85;
  color: var(--color-text-secondary);
}

.article-content h2 {
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--color-text-primary);
  margin-top: var(--space-12);
  margin-bottom: var(--space-5);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}
.article-content h3 {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-top: var(--space-8);
  margin-bottom: var(--space-4);
}
.article-content p {
  margin-bottom: var(--space-5);
}
.article-content ul,
.article-content ol {
  margin-bottom: var(--space-5);
  padding-left: var(--space-6);
  list-style: disc;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.article-content ol { list-style: decimal; }
.article-content li { color: var(--color-text-secondary); }

.article-content a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--ease-fast);
}
.article-content a:hover { color: var(--color-accent-2); }

.article-content strong { color: var(--color-text-primary); font-weight: 700; }

.article-content blockquote {
  border-left: 3px solid var(--color-accent);
  padding: var(--space-4) var(--space-6);
  background: var(--color-accent-dim);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  margin: var(--space-8) 0;
  font-style: italic;
  color: var(--color-text-primary);
}

.article-content .callout {
  padding: var(--space-6);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border-accent);
  border-radius: var(--radius-xl);
  margin: var(--space-8) 0;
}
.article-content .callout p { margin-bottom: 0; }

/* Article sidebar */
.article-sidebar {
  position: sticky;
  top: 8rem;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.sidebar-card {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
}

.sidebar-card__title {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.toc-list a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: var(--space-1) 0;
  display: block;
  border-left: 2px solid transparent;
  padding-left: var(--space-3);
  transition: color var(--ease-fast), border-color var(--ease-fast);
}
.toc-list a:hover { color: var(--color-accent); border-left-color: var(--color-accent); }

/* Article related posts */
.related-posts {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.related-post {
  display: flex;
  gap: var(--space-4);
  text-decoration: none;
  align-items: flex-start;
  transition: opacity var(--ease-fast);
}
.related-post:hover { opacity: 0.8; }
.related-post img {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  object-fit: cover;
  flex-shrink: 0;
}
.related-post__title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-primary);
  line-height: 1.4;
}
.related-post__date {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}