/* ==========================================================================
   Snippets.css — Blog/Snippets Section Styles
   "High-End Research Lab" Design System
   ========================================================================== */

/* --------------------------------------------------------------------------
   Snippets Page Layout
   -------------------------------------------------------------------------- */
.snippets-page {
  padding-top: max(12vh, 80px);
  padding-bottom: var(--space-3xl);
}

.snippet-hero {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
}

.snippet-hero h1 {
  font-size: var(--font-size-hero);
  margin: 0;
}

.about-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  max-width: 60ch;
}

.about-section h2 {
  font-size: var(--font-size-h3);
  font-weight: 600;
  margin: 0;
}

.about-section p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 0;
}

/* --------------------------------------------------------------------------
   Snippets Surface (List Container)
   -------------------------------------------------------------------------- */
.snippets-surface {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.snippets-header {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: space-between;
  align-items: center;
}

/* --------------------------------------------------------------------------
   Category Filters
   -------------------------------------------------------------------------- */
.categories {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.category-btn {
  border: 1px solid var(--border);
  background: var(--bg-primary);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-family: var(--font-primary);
  transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
  min-height: 44px;
}

.category-btn.active,
.category-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent);
  background: var(--bg-elevated);
}

/* --------------------------------------------------------------------------
   Search
   -------------------------------------------------------------------------- */
.search-container {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  transition: border-color var(--transition-fast);
}

.search-container:focus-within {
  border-color: var(--accent);
}

.search-icon {
  color: var(--text-secondary);
  width: 18px;
  height: 18px;
}

.search-input {
  border: none;
  outline: none;
  background: transparent;
  color: var(--text-primary);
  width: 200px;
  font-family: var(--font-primary);
  font-size: var(--font-size-sm);
}

.search-input::placeholder {
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   Post Cards
   -------------------------------------------------------------------------- */
.snippets-posts {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.snippets-post {
  position: relative;
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg-surface);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.snippets-post:hover {
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
}

.snippets-post--hidden {
  display: none;
}

.post-link {
  position: absolute;
  inset: 0;
  z-index: 10; /* Above all card content for full-card clickability */
}

.post-meta {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.post-meta span {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
}

.post-title {
  margin: var(--space-sm) 0 var(--space-xs);
  font-size: var(--font-size-lg);
  font-weight: 600;
  position: relative;
  z-index: 2;
}

.post-excerpt {
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.6;
  font-size: var(--font-size-sm);
  position: relative;
  z-index: 2;
}

.snippets-empty-state {
  margin: var(--space-md) 0;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

/* --------------------------------------------------------------------------
   Pagination
   -------------------------------------------------------------------------- */
.pagination {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.pagination-btn {
  border: 1px solid var(--border);
  background: var(--bg-surface);
  color: var(--text-secondary);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-family: var(--font-primary);
  transition: all var(--transition-fast);
  min-height: 44px;
}

.pagination-btn:hover:not(:disabled) {
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.15);
}

.pagination-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* --------------------------------------------------------------------------
   Back Button
   -------------------------------------------------------------------------- */
.back-button {
  display: flex;
  gap: var(--space-md);
  align-items: center;
  margin-top: var(--space-lg);
}

.back-button .nav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.back-button .nav-link:hover {
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.15);
}

/* --------------------------------------------------------------------------
   Post Detail Pages
   -------------------------------------------------------------------------- */
.snippet-post-page {
  background: var(--bg-primary);
  color: var(--text-primary);
}

.snippet-post-wrapper {
  max-width: 800px;
  margin: 0 auto;
  padding: max(12vh, 80px) var(--space-xl) var(--space-3xl);
}

.snippet-post-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-lg);
}

.back-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.back-chip:hover {
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.15);
}

/* --------------------------------------------------------------------------
   Post Content (Article)
   -------------------------------------------------------------------------- */
.tidbit-post-content {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
}

.tidbit-post-content h1 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  margin-top: var(--space-md);
  margin-bottom: var(--space-md);
  line-height: 1.2;
}

.tidbit-post-content h2 {
  font-size: var(--font-size-h2);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}

.tidbit-post-content h3 {
  font-size: var(--font-size-h3);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-md);
}

.tidbit-post-content p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin: 0 0 var(--space-md);
}

.tidbit-post-content ul,
.tidbit-post-content ol {
  color: var(--text-secondary);
  padding-left: var(--space-lg);
  line-height: 1.8;
  margin: 0 0 var(--space-md);
  list-style: disc;
}

.tidbit-post-content ol {
  list-style: decimal;
}

.tidbit-post-content li {
  margin-bottom: var(--space-sm);
}

.tidbit-post-content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.tidbit-post-content a:hover {
  color: var(--accent-hover);
}

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

.tidbit-post-content em {
  font-style: italic;
}

/* --------------------------------------------------------------------------
   Code Blocks
   -------------------------------------------------------------------------- */
.tidbit-post-content pre {
  background: #0a0a0a;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  overflow-x: auto;
  margin: var(--space-md) 0;
  font-size: var(--font-size-sm);
}

.tidbit-post-content code {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

.tidbit-post-content :not(pre) > code {
  background: var(--bg-elevated);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.tidbit-post-content pre code {
  background: transparent;
  border: none;
  padding: 0;
}

/* --------------------------------------------------------------------------
   Blockquotes
   -------------------------------------------------------------------------- */
.tidbit-post-content blockquote {
  border-left: 3px solid var(--accent);
  padding-left: var(--space-md);
  margin: var(--space-md) 0;
  color: var(--text-secondary);
  font-style: italic;
}

/* --------------------------------------------------------------------------
   Images in Posts
   -------------------------------------------------------------------------- */
.tidbit-post-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: var(--space-md) 0;
}

/* --------------------------------------------------------------------------
   Math (KaTeX/MathJax)
   -------------------------------------------------------------------------- */
.tidbit-post-content .katex-display,
.tidbit-post-content .MathJax_Display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: var(--space-sm) 0;
}

/* --------------------------------------------------------------------------
   Figures & Captions
   -------------------------------------------------------------------------- */
.tidbit-post-content figure {
  margin: var(--space-lg) 0;
}

.tidbit-post-content figcaption {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  text-align: center;
  margin-top: var(--space-sm);
  font-style: italic;
}

/* --------------------------------------------------------------------------
   Horizontal Rules
   -------------------------------------------------------------------------- */
.tidbit-post-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-xl) 0;
}

/* --------------------------------------------------------------------------
   Tables
   -------------------------------------------------------------------------- */
.tidbit-post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-md) 0;
  font-size: var(--font-size-sm);
}

.tidbit-post-content th,
.tidbit-post-content td {
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--border);
  text-align: left;
}

.tidbit-post-content th {
  background: var(--bg-elevated);
  font-weight: 600;
  color: var(--text-primary);
}

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

/* --------------------------------------------------------------------------
   Post Subtitles
   -------------------------------------------------------------------------- */
.tidbit-post-content .subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  font-style: italic;
}

/* --------------------------------------------------------------------------
   Mermaid Diagrams
   -------------------------------------------------------------------------- */
.tidbit-post-content .mermaid {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin: var(--space-md) 0;
  overflow-x: auto;
}

/* --------------------------------------------------------------------------
   Post Footer
   -------------------------------------------------------------------------- */
.snippet-post-footer {
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border);
}

.back-chip--secondary {
  background: var(--bg-surface);
}

/* --------------------------------------------------------------------------
   Responsive — Iron Wall Left-Alignment Strategy
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  .snippets-page {
    padding-top: 100px;
    padding-left: 24px;
    padding-right: 24px;
    /* Account for bottom dock */
    padding-bottom: calc(80px + env(safe-area-inset-bottom));
  }

  /* Header — left-aligned */
  .snippet-hero {
    text-align: left;
  }

  .snippet-hero h1 {
    font-size: clamp(1.875rem, 8vw, 2.25rem);
    letter-spacing: -0.04em;
  }

  .about-section {
    max-width: none;
  }

  .about-section h2 {
    font-size: var(--font-size-base);
  }

  .about-section p {
    font-size: var(--font-size-sm);
    line-height: 1.6;
  }

  /* Snippets surface */
  .snippets-surface {
    padding: var(--space-md);
  }

  .snippets-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
  }

  .search-input {
    width: 100%;
  }

  .search-container {
    width: 100%;
  }

  /* Categories — horizontal scroll on mobile */
  .categories {
    display: flex;
    gap: var(--space-sm);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: var(--space-xs);
  }

  .categories::-webkit-scrollbar {
    display: none;
  }

  .category-btn {
    flex-shrink: 0;
    min-height: 44px;
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-sm);
  }

  /* Post cards — 16px gap stack */
  .snippets-posts {
    gap: 16px;
  }

  .snippets-post {
    padding: var(--space-md);
    /* Make entire card tappable */
    -webkit-tap-highlight-color: transparent;
  }

  .post-meta {
    font-size: 10px;
    gap: var(--space-sm);
  }

  .post-title {
    font-size: var(--font-size-base);
    margin: var(--space-sm) 0 var(--space-xs);
  }

  .post-excerpt {
    font-size: var(--font-size-sm);
    line-height: 1.5;
  }

  /* Post detail pages */
  .snippet-post-wrapper {
    padding: 100px 24px var(--space-2xl);
    padding-bottom: calc(100px + env(safe-area-inset-bottom));
  }

  .snippet-post-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
  }

  .tidbit-post-content {
    padding: var(--space-md);
  }

  .tidbit-post-content h1 {
    font-size: clamp(1.5rem, 6vw, 1.875rem);
  }

  .tidbit-post-content h2 {
    font-size: var(--font-size-lg);
    margin-top: var(--space-lg);
  }

  .tidbit-post-content h3 {
    font-size: var(--font-size-base);
  }

  .tidbit-post-content pre {
    font-size: var(--font-size-xs);
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
  }

  /* Code blocks — horizontal scroll */
  .tidbit-post-content pre {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  /* Back button */
  .back-button {
    margin-bottom: var(--space-xl);
  }
}

@media (max-width: 480px) {
  .snippets-page {
    padding-left: 20px;
    padding-right: 20px;
  }

  .snippet-post-wrapper {
    padding-left: 20px;
    padding-right: 20px;
  }

  .post-meta {
    gap: var(--space-xs);
    flex-wrap: wrap;
  }

  .category-btn {
    padding: var(--space-xs) var(--space-sm);
    font-size: var(--font-size-xs);
    min-height: 40px;
  }

  .tidbit-post-content h1 {
    font-size: clamp(1.25rem, 5vw, 1.5rem);
  }

  /* Tables — horizontal scroll on small screens */
  .tidbit-post-content table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}