/* ═══════════════════════════════════════
   BLOG STYLES — Aira Learn Blog
═══════════════════════════════════════ */

/* Blog Hero */
.blog-hero {
  background: linear-gradient(160deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  border-bottom: 1px solid var(--glass-border);
  padding: 8rem 0 4rem;
  text-align: center;
}

.blog-hero .section-label {
  margin-bottom: 1rem;
}

.blog-hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.blog-hero p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* Tag Filters */
.blog-filters {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 2rem;
}

.filter-tag {
  padding: 0.45rem 1rem;
  border-radius: var(--radius-full);
  border: 1.5px solid var(--glass-border);
  background: var(--bg-elevated);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out-expo);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.filter-tag:hover,
.filter-tag.active {
  background: rgba(124, 58, 237, 0.1);
  border-color: var(--brand-500);
  color: var(--brand-400);
}

/* Blog Grid */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

/* Featured Post (spans full width) */
.blog-card.featured-post {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 3rem;
  align-items: center;
}

.blog-card.featured-post .blog-card-body {
  padding: 2rem 0;
}

.blog-card.featured-post .blog-card-visual {
  height: 320px;
}

/* Blog Card */
.blog-card {
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--glass-border);
  background: var(--bg-elevated);
  overflow: hidden;
  transition: transform var(--duration-normal) var(--ease-out-expo),
              box-shadow var(--duration-normal),
              border-color var(--duration-normal);
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}

.blog-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(109, 40, 217, 0.12);
  border-color: rgba(124, 58, 237, 0.22);
}

.blog-card-visual {
  height: 200px;
  position: relative;
  overflow: hidden;
}

/* Gradient visuals for blog cards */
.blog-card-visual.grad-1 { background: linear-gradient(135deg, #7c3aed 0%, #a78bfa 50%, #4f46e5 100%); }
.blog-card-visual.grad-2 { background: linear-gradient(135deg, #2563eb 0%, #60a5fa 50%, #1d4ed8 100%); }
.blog-card-visual.grad-3 { background: linear-gradient(135deg, #db2777 0%, #f472b6 50%, #be185d 100%); }
.blog-card-visual.grad-4 { background: linear-gradient(135deg, #059669 0%, #34d399 50%, #047857 100%); }
.blog-card-visual.grad-5 { background: linear-gradient(135deg, #ea580c 0%, #fb923c 50%, #c2410c 100%); }
.blog-card-visual.grad-6 { background: linear-gradient(135deg, #4f46e5 0%, #818cf8 50%, #4338ca 100%); }

.blog-card-visual .card-pattern {
  position: absolute;
  inset: 0;
  opacity: 0.15;
  background-image: radial-gradient(circle at 20% 50%, rgba(255,255,255,0.3) 1px, transparent 1px),
                     radial-gradient(circle at 80% 20%, rgba(255,255,255,0.2) 2px, transparent 2px),
                     radial-gradient(circle at 60% 80%, rgba(255,255,255,0.25) 1.5px, transparent 1.5px);
  background-size: 40px 40px, 60px 60px, 50px 50px;
}

.blog-card-visual .card-icon {
  position: absolute;
  bottom: 1.5rem;
  left: 1.5rem;
  font-size: 2.5rem;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}

.blog-card-body {
  padding: 1.75rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.blog-card-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

.blog-card-meta .reading-time {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.blog-card-date {
  font-weight: 500;
}

.blog-card h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.blog-card.featured-post h2 {
  font-size: 1.75rem;
}

.blog-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.6;
  flex-grow: 1;
  margin-bottom: 1rem;
}

.blog-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.blog-tag {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background: rgba(124, 58, 237, 0.08);
  color: var(--brand-400);
  letter-spacing: 0.02em;
}

.featured-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  background: var(--grad-brand);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  position: absolute;
  top: 1rem;
  right: 1rem;
  box-shadow: 0 2px 8px rgba(124, 58, 237, 0.4);
}

/* Pagination */
.blog-pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  margin-top: 3rem;
}

.page-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--glass-border);
  background: var(--bg-elevated);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out-expo);
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-btn:hover,
.page-btn.active {
  background: var(--brand-500);
  border-color: var(--brand-500);
  color: #fff;
}

/* No Results */
.no-results {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-tertiary);
}

.no-results h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

/* ═══════════════════════════════════════
   BLOG POST — Article Page
═══════════════════════════════════════ */

.post-header {
  padding: 8rem 0 3rem;
  background: linear-gradient(160deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  border-bottom: 1px solid var(--glass-border);
}

.post-header .breadcrumb {
  margin-bottom: 1.5rem;
}

.post-header h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.15;
  margin-bottom: 1.25rem;
  max-width: 800px;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.post-meta .author {
  font-weight: 600;
  color: var(--text-primary);
}

.post-meta .divider {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--text-tertiary);
}

.post-tags {
  display: flex;
  gap: 0.4rem;
  margin-top: 1.25rem;
}

/* Article Content */
.post-content {
  max-width: 780px;
  margin: 0 auto;
  padding: 3rem 0 5rem;
}

.post-content h2 {
  font-size: 1.75rem !important;
  font-weight: 700;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
  padding: 0 !important;
}

.post-content h3 {
  font-size: 1.35rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.post-content p {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.post-content ul,
.post-content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.post-content li {
  font-size: 1.02rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

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

.post-content blockquote {
  border-left: 4px solid var(--brand-400);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  background: rgba(124, 58, 237, 0.04);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--text-secondary);
}

.post-content code {
  background: var(--bg-tertiary);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.9em;
  color: var(--brand-600);
}

.post-content pre {
  background: #1e1b4b;
  color: #e2e8f0;
  padding: 1.5rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 1.5rem 0;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.6;
}

.post-content pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}

.post-content th,
.post-content td {
  padding: 0.75rem 1rem;
  border: 1px solid var(--glass-border);
  text-align: left;
}

.post-content th {
  background: var(--bg-secondary);
  font-weight: 700;
  color: var(--text-primary);
}

.post-content td {
  color: var(--text-secondary);
}

.post-content img {
  max-width: 100%;
  border-radius: var(--radius-md);
  margin: 1.5rem 0;
}

.post-content a {
  color: var(--brand-400);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--duration-fast);
}

.post-content a:hover {
  color: var(--brand-600);
}

/* Table of Contents */
.toc {
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 1.5rem 2rem;
  margin-bottom: 2.5rem;
}

.toc h3 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  margin-bottom: 1rem !important;
  margin-top: 0 !important;
}

.toc ul {
  list-style: none;
  padding: 0 !important;
  margin: 0 !important;
}

.toc li {
  margin-bottom: 0.4rem !important;
}

.toc a {
  color: var(--text-secondary) !important;
  text-decoration: none !important;
  font-size: 0.92rem !important;
  font-weight: 500;
  transition: color var(--duration-fast);
}

.toc a:hover {
  color: var(--brand-400) !important;
}

/* Share Bar */
.share-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--glass-border);
  border-bottom: 1px solid var(--glass-border);
  margin: 2rem 0;
}

.share-bar span {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.share-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--glass-border);
  background: var(--bg-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out-expo);
  text-decoration: none;
  font-size: 1rem;
}

.share-btn:hover {
  background: rgba(124, 58, 237, 0.1);
  border-color: var(--brand-500);
  transform: translateY(-2px);
}

/* Related Posts */
.related-posts {
  padding: 4rem 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--glass-border);
}

.related-posts h2 {
  font-size: 1.75rem !important;
  font-weight: 700;
  margin-bottom: 2rem;
  text-align: center;
  color: var(--text-primary);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

/* CTA Banner in Post */
.post-cta {
  background: var(--grad-brand);
  border-radius: var(--radius-lg);
  padding: 3rem 2rem;
  text-align: center;
  color: #fff;
  margin: 3rem 0;
}

.post-cta h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: #fff !important;
}

.post-cta p {
  color: rgba(255,255,255,0.9) !important;
  margin-bottom: 1.5rem !important;
  max-width: 500px;
  margin-inline: auto;
}

/* Loading state */
.blog-loading {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-tertiary);
}

.blog-loading .spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--glass-border);
  border-top-color: var(--brand-400);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 1rem;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ═══════════════════════════════════════
   BLOG RESPONSIVE
═══════════════════════════════════════ */
@media (max-width: 768px) {
  .blog-hero {
    padding: 7rem 0 3rem;
  }
  
  .blog-hero h1 {
    font-size: 1.75rem;
    padding: 0 1rem;
  }
  
  .blog-hero p {
    font-size: 0.95rem;
    padding: 0 1rem;
  }
  
  .blog-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .blog-card.featured-post {
    grid-template-columns: 1fr;
    gap: 0;
  }
  
  .blog-card.featured-post .blog-card-body {
    padding: 1.5rem;
  }
  
  .blog-card.featured-post .blog-card-visual {
    height: 200px;
  }
  
  .blog-card.featured-post h2 {
    font-size: 1.35rem;
  }
  
  .blog-card-body {
    padding: 1.25rem;
  }
  
  .blog-card h2 {
    font-size: 1.1rem;
  }
  
  .filter-tag {
    font-size: 0.75rem;
    padding: 0.35rem 0.75rem;
  }
  
  .post-header {
    padding: 7rem 0 2rem;
  }
  
  .post-header h1 {
    font-size: 1.6rem;
  }
  
  .post-meta {
    gap: 0.75rem;
    font-size: 0.8rem;
  }
  
  .post-content {
    padding: 2rem 0 3rem;
  }
  
  .post-content h2 {
    font-size: 1.4rem !important;
  }
  
  .post-content h3 {
    font-size: 1.15rem;
  }
  
  .post-content p {
    font-size: 0.97rem;
  }
  
  .post-cta {
    padding: 2rem 1.5rem;
    margin: 2rem 0;
  }
  
  .post-cta h3 {
    font-size: 1.25rem;
  }
  
  .related-grid {
    grid-template-columns: 1fr;
  }
  
  .share-bar {
    flex-wrap: wrap;
    gap: 0.75rem;
  }
  
  .toc {
    padding: 1.25rem 1.5rem;
  }
}

@media (max-width: 480px) {
  .blog-card-visual {
    height: 160px;
  }
  
  .blog-card.featured-post .blog-card-visual {
    height: 160px;
  }
  
  .blog-hero h1 {
    font-size: 1.5rem;
  }
  
  .post-header h1 {
    font-size: 1.4rem;
  }
}