/* ==========================================================================
   css/blog.css - Unified Blog Stylesheet (DRY & KISS)
   ========================================================================== */

:root {
  --blog-primary: var(--color-accent, #2563eb);
  --blog-secondary: var(--color-accent-hover, #1d4ed8);
  --blog-text: var(--color-text-main, #334155);
  --blog-text-muted: var(--color-text-muted, #64748b);
  --blog-bg: var(--color-bg-page, #ffffff);
  --blog-bg-alt: var(--color-bg-alt, #f8fafc);
  --blog-border: var(--color-border, #e2e8f0);
  --blog-font-sans: var(--font-sans, 'Inter', system-ui, sans-serif);
  --blog-font-mono: var(--font-mono, 'Fira Code', monospace);
  --transition-smooth: all 0.3s ease;
}

/* Visually Hidden Class for Accessibility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ==========================================================================
   Blog Homepage / Index Styles
   ========================================================================== */

/* Hero Section */
.blog-hero {
  padding: 8rem 1.5rem 4rem;
  background: linear-gradient(to bottom, #ffffff, var(--blog-bg-alt));
  text-align: center;
}

.blog-hero .hero-title {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 800;
  color: var(--color-brand, #0f172a);
  margin-bottom: 1rem;
  line-height: 1.2;
}

.blog-hero .hero-subtitle {
  font-size: 1.2rem;
  color: var(--blog-text-muted);
  max-width: 600px;
  margin: 0 auto 2rem;
}

/* Blog Posts Grid */
.posts-grid {
  max-width: var(--layout-max-width, 1100px);
  margin: 0 auto;
  padding: 4rem 1.5rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2.5rem;
}

.post-card-link {
  text-decoration: none;
  color: inherit;
  display: block;
  height: 100%;
}

.post-card {
  background: var(--blog-bg);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--blog-border);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.post-card-link:hover .post-card {
  transform: translateY(-6px);
  box-shadow: 0 12px 20px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  border-color: var(--blog-primary);
}

.post-image-tag {
  width: 100%;
  height: 220px;
  object-fit: cover;
  object-position: center;
  background-color: var(--blog-bg-alt);
  display: block;
}

.post-content {
  padding: 1.75rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.post-category {
  color: var(--blog-primary);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.075em;
  margin-bottom: 0.5rem;
}

.post-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0.5rem 0;
  color: var(--color-brand, #0f172a);
  line-height: 1.3;
}

.post-excerpt {
  color: var(--blog-text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  flex-grow: 1;
  line-height: 1.6;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.85rem;
  color: var(--blog-text-muted);
  margin-top: auto;
  border-top: 1px solid var(--blog-border);
  padding-top: 1rem;
}

/* ==========================================================================
   More Articles / Simple List Section
   ========================================================================== */

.more-articles {
  padding: 5rem 1.5rem;
  background-color: var(--blog-bg-alt);
  border-top: 1px solid var(--blog-border);
  border-bottom: 1px solid var(--blog-border);
}

.more-articles-container {
  max-width: 800px;
  margin: 0 auto;
}

.section-heading {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-brand, #0f172a);
  text-align: center;
  margin-bottom: 3rem;
  position: relative;
  padding-bottom: 0.75rem;
}

.section-heading::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background-color: var(--blog-primary);
  border-radius: 2px;
}

.articles-list-simple {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.article-link-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--blog-bg);
  padding: 1.25rem 1.5rem;
  border-radius: 10px;
  border: 1px solid var(--blog-border);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
  transition: var(--transition-smooth);
  text-decoration: none;
}

.article-link-item:hover {
  transform: translateY(-3px) scale(1.01);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.05);
  border-color: var(--blog-primary);
}

.article-link-content {
  flex: 1;
  margin-right: 1.5rem;
}

.article-link-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-brand, #0f172a);
  margin-bottom: 0.25rem;
  transition: color 0.2s ease;
}

.article-link-item:hover .article-link-title {
  color: var(--blog-primary);
}

.article-link-caption {
  font-size: 0.9rem;
  color: var(--blog-text-muted);
  line-height: 1.5;
}

.article-link-icon {
  width: 52px;
  height: 52px;
  object-fit: cover;
  border-radius: 8px;
  flex-shrink: 0;
  background-color: var(--blog-bg-alt);
}

/* ==========================================================================
   Single Article Styling
   ========================================================================== */

.blog-post {
  max-width: 800px;
  margin: 7rem auto 4rem;
  padding: 0 1.5rem;
}

.blog-header {
  margin-bottom: 2.5rem;
  text-align: center;
}

.blog-title {
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 800;
  color: var(--color-brand, #0f172a);
  margin-bottom: 1.25rem;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.blog-meta {
  color: var(--blog-text-muted);
  font-size: 0.95rem;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.blog-meta span.author-name {
  color: var(--blog-primary);
  font-weight: 600;
}

.blog-featured-image {
  width: 100%;
  height: 420px;
  background-size: cover;
  background-position: center;
  border-radius: 12px;
  border: 1px solid var(--blog-border);
  margin-bottom: 3rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

/* Blog Article Content Typography */
.blog-content {
  line-height: 1.8;
  color: var(--blog-text);
  font-size: 1.1rem;
}

.blog-content h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-brand, #0f172a);
  margin: 2.75rem 0 1rem;
  letter-spacing: -0.015em;
  line-height: 1.3;
}

.blog-content h3 {
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--color-brand, #0f172a);
  margin: 2rem 0 1rem;
  line-height: 1.3;
}

.blog-content p {
  margin-bottom: 1.75rem;
}

.blog-content ul,
.blog-content ol {
  margin: 1.75rem 0;
  padding-left: 2rem;
}

.blog-content li {
  margin-bottom: 0.75rem;
}

.blog-content strong {
  color: var(--color-brand, #0f172a);
  font-weight: 600;
}

/* Blockquotes */
.blog-content blockquote {
  border-left: 4px solid var(--blog-primary);
  padding: 0.5rem 0 0.5rem 1.5rem;
  margin: 2rem 0;
  font-style: italic;
  color: var(--blog-text-muted);
  background: var(--blog-bg-alt);
  border-radius: 0 8px 8px 0;
}

/* Equations styling */
.blog-content .equation {
  font-family: var(--blog-font-mono);
  background: var(--blog-bg-alt);
  padding: 1.5rem;
  border-radius: 8px;
  text-align: center;
  margin: 2rem auto;
  font-size: 1.2rem;
  color: var(--color-brand, #0f172a);
  border: 1px solid var(--blog-border);
  overflow-x: auto;
}

/* Tables styling */
.table-wrapper {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 2.5rem 0;
  border-radius: 8px;
  border: 1px solid var(--blog-border);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.blog-content table {
  width: 100%;
  max-width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  display: block;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: 8px;
  border: 1px solid var(--blog-border);
}

.blog-content th,
.blog-content td {
  padding: 0.85rem 1.15rem;
  border: 1px solid var(--blog-border);
}

.blog-content th {
  background-color: var(--blog-bg-alt);
  text-align: left;
  font-weight: 600;
  color: var(--color-brand, #0f172a);
}

.blog-content tr:hover {
  background-color: var(--blog-bg-alt);
}

/* Code Block & Syntax Styling */
.code-block {
  background: #0f172a;
  border: 1px solid var(--blog-border);
  border-radius: 8px;
  padding: 1.5rem;
  margin: 2rem 0;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  font-family: var(--blog-font-mono);
  font-size: 0.9rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  color: #e2e8f0;
  box-sizing: border-box;
}

.code-header {
  color: var(--blog-primary);
  font-weight: 600;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.code-block pre,
.blog-content pre {
  margin: 0;
  padding: 0;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: break-word;
}

.code-block code,
.blog-content pre code {
  font-family: var(--blog-font-mono);
  font-size: 0.88rem;
  line-height: 1.65;
  color: #e2e8f0;
  background: transparent;
  padding: 0;
  border: none;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: break-word;
}

.blog-content code {
  font-family: var(--blog-font-mono);
  font-size: 0.88em;
  background: var(--blog-bg-alt);
  padding: 0.2em 0.45em;
  border-radius: 4px;
  border: 1px solid var(--blog-border);
  color: var(--blog-primary);
  word-break: break-word;
  overflow-wrap: break-word;
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */

@media (max-width: 768px) {
  .blog-hero {
    padding: 5.5rem 1rem 2.5rem;
  }
  
  .posts-grid {
    padding: 2rem 1rem;
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }
  
  .more-articles {
    padding: 3rem 1rem;
  }
  
  .section-heading {
    margin-bottom: 2rem;
  }
  
  .article-link-item {
    padding: 1rem 1.15rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .article-link-content {
    margin-right: 0;
  }
  
  .article-link-title {
    font-size: 1.05rem;
  }
  
  .article-link-caption {
    font-size: 0.85rem;
  }
  
  .article-link-icon {
    width: 44px;
    height: 44px;
  }
  
  .blog-post {
    margin-top: 5rem;
    padding: 0 1rem;
    max-width: 100%;
    box-sizing: border-box;
  }

  .blog-title {
    font-size: clamp(1.55rem, 5.5vw, 2.2rem);
    line-height: 1.25;
    overflow-wrap: break-word;
    word-break: break-word;
  }
  
  .blog-featured-image {
    height: 220px;
    margin-bottom: 2rem;
    border-radius: 8px;
  }

  .blog-content {
    font-size: 1.02rem;
    line-height: 1.7;
    overflow-wrap: break-word;
    word-break: break-word;
  }

  .blog-content h2 {
    font-size: 1.45rem;
    margin: 2.25rem 0 0.75rem;
  }

  .blog-content h3 {
    font-size: 1.2rem;
    margin: 1.75rem 0 0.5rem;
  }

  .blog-content ul,
  .blog-content ol {
    padding-left: 1.25rem;
  }

  .code-block {
    padding: 1rem;
    font-size: 0.82rem;
    margin: 1.5rem 0;
    border-radius: 6px;
  }

  .actionable-steps {
    padding: 1.25rem 1rem;
    margin: 2rem 0;
    border-radius: 8px;
  }
  
  .author-content {
    flex-direction: column;
    text-align: center;
    gap: 1.5rem;
  }
  
  .author-section {
    padding: 1.75rem 1.25rem;
    margin: 3rem 0 2rem;
  }
  
  .newsletter-section-form {
    flex-direction: column;
    gap: 0.75rem;
  }
}