/* ============================================
   NEWSPEPPER THEME - Vintage Newspaper Style
   ============================================ */

/* CSS Variables - Light Mode (Classic Newspaper) */
:root {
  /* Colors */
  --bg-primary: #f9f7f1;
  --bg-secondary: #ffffff;
  --text-primary: #1a1a1a;
  --text-secondary: #4a4a4a;
  --text-muted: #6a6a6a;
  --accent-primary: #8b0000;
  --accent-secondary: #b8860b;
  --border-color: #2a2a2a;
  --border-light: #d4d4d4;
  
  /* Code blocks */
  --code-bg: #f5f2e8;
  --code-block-bg: #fdfcf8;
  --code-gutter-bg: #ebe8dc;
  --code-text: #2d2d2d;
  --code-border: #a89968;
  --code-number: #8b4513;
  --code-function: #2c5282;
  
  /* Syntax highlighting - vibrant newspaper ink colors */
  --syntax-keyword: #8b0000;      /* Deep red - like headlines */
  --syntax-string: #a0522d;       /* Sienna brown - like aged ink */
  --syntax-number: #d2691e;       /* Chocolate - warm number color */
  --syntax-function: #1e4d7b;     /* Deep blue - professional */
  --syntax-variable: #2f4f4f;     /* Dark slate gray */
  --syntax-type: #8b4513;         /* Saddle brown */
  --syntax-meta: #708090;         /* Slate gray */
  --syntax-regexp: #556b2f;       /* Dark olive green */
  --syntax-attribute: #b8860b;    /* Dark goldenrod */
  
  /* Typography */
  --font-display: 'Playfair Display', serif;
  --font-body: 'Lora', Georgia, serif;
  --font-accent: 'Libre Baskerville', serif;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
}

/* Dark Mode (Blue Print / Cyanotype Style) */
body.dark-mode {
  --bg-primary: #0d1b2a;
  --bg-secondary: #1b263b;
  --text-primary: #e0e1dd;
  --text-secondary: #c5c6c3;
  --text-muted: #9a9b98;
  --accent-primary: #f4a261;
  --accent-secondary: #e76f51;
  --border-color: #415a77;
  --border-light: #2d3e50;
  
  /* Code blocks - dark mode */
  --code-bg: #1a2332;
  --code-block-bg: #0f1824;
  --code-gutter-bg: #151e2b;
  --code-text: #e0e1dd;
  --code-border: #415a77;
  --code-number: #f4a261;
  --code-function: #8ecae6;
  
  /* Syntax highlighting - dark mode vibrant colors */
  --syntax-keyword: #f4a261;      /* Warm orange */
  --syntax-string: #e9c46a;       /* Sandy yellow */
  --syntax-number: #f4a261;       /* Orange accent */
  --syntax-function: #8ecae6;     /* Sky blue */
  --syntax-variable: #adb5bd;     /* Light gray */
  --syntax-type: #e76f51;         /* Coral */
  --syntax-meta: #778da9;         /* Steel blue */
  --syntax-regexp: #90be6d;       /* Light green */
  --syntax-attribute: #f4a261;    /* Orange */
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-body);
  line-height: 1.8;
  color: var(--text-primary);
  background: var(--bg-primary);
  transition: background-color var(--transition-medium),
              color var(--transition-medium);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-primary);
}

/* ============================================
   NEWSPAPER WRAPPER
   ============================================ */
.newspaper-wrapper {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg);
  background: var(--bg-secondary);
  box-shadow: 0 0 40px rgba(0, 0, 0, 0.15);
}

/* ============================================
   HEADER - MASTHEAD
   ============================================ */
.newspaper-header {
  border-bottom: 4px double var(--border-color);
  margin-bottom: var(--spacing-2xl);
  padding-bottom: var(--spacing-lg);
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--border-light);
  margin-bottom: var(--spacing-lg);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
}

.header-edition {
  font-weight: 600;
}

.header-date {
  flex: 1;
  text-align: center;
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border-light);
  padding: 0.25rem 0.5rem;
  cursor: pointer;
  font-size: 1rem;
  border-radius: 3px;
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--bg-primary);
  border-color: var(--border-color);
}

.toggle-sun,
.toggle-moon {
  display: inline-block;
}

body.dark-mode .toggle-sun {
  display: none;
}

body:not(.dark-mode) .toggle-moon {
  display: none;
}

/* Masthead Title */
.masthead {
  text-align: center;
  margin: var(--spacing-xl) 0;
}

.newspaper-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 900;
  letter-spacing: 0.05em;
  line-height: 1;
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  border-top: 2px solid var(--border-color);
  border-bottom: 2px solid var(--border-color);
  padding: var(--spacing-md) 0;
}

.newspaper-title a {
  color: var(--text-primary);
}

.newspaper-motto {
  font-family: var(--font-accent);
  font-size: clamp(0.875rem, 2vw, 1.125rem);
  font-style: italic;
  color: var(--text-secondary);
  margin-top: var(--spacing-md);
  letter-spacing: 0.5px;
}

/* Navigation */
.newspaper-nav {
  margin-top: var(--spacing-lg);
}

.nav-divider {
  height: 1px;
  background: var(--border-color);
  margin: var(--spacing-sm) 0;
}

.nav-menu {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xl);
  list-style: none;
  padding: var(--spacing-md) 0;
}

.nav-link {
  font-family: var(--font-accent);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition-fast);
}

.nav-link:hover {
  border-bottom-color: var(--accent-primary);
}

/* ============================================
   MAIN CONTENT - FRONT PAGE
   ============================================ */
.newspaper-content {
  min-height: 60vh;
}

.front-page {
  padding: var(--spacing-lg) 0;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

/* Article Cards */
.article-card {
  border-bottom: 2px solid var(--border-light);
  padding-bottom: var(--spacing-lg);
}

.article-featured {
  grid-column: 1 / -1;
  border-bottom: 3px double var(--border-color);
  padding-bottom: var(--spacing-xl);
}

.article-meta-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-sm);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.article-category {
  background: var(--accent-primary);
  color: var(--bg-secondary);
  padding: 0.25rem 0.75rem;
  font-weight: 700;
  letter-spacing: 1px;
  position: relative;
  clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 50%, calc(100% - 6px) 100%, 0 100%);
}

.article-date {
  color: var(--text-muted);
  font-weight: 500;
}

.article-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  line-height: 1.2;
  margin: var(--spacing-sm) 0;
  color: var(--text-primary);
}

.article-featured .article-title {
  font-size: clamp(2rem, 4vw, 3rem);
  border-bottom: 3px double var(--border-color);
  padding-bottom: var(--spacing-sm);
  position: relative;
}

.article-featured .article-title::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 60px;
  height: 3px;
  background: var(--accent-primary);
}

.article-subtitle {
  font-family: var(--font-accent);
  font-size: 1.125rem;
  font-style: italic;
  color: var(--text-secondary);
  margin-top: var(--spacing-sm);
}

.article-excerpt {
  font-size: 1rem;
  line-height: 1.8;
  margin: var(--spacing-md) 0;
  color: var(--text-primary);
  text-align: justify;
  column-count: 1;
}

.article-featured .article-excerpt {
  column-count: 2;
  column-gap: var(--spacing-xl);
  font-size: 1.0625rem;
}

@media (max-width: 768px) {
  .article-featured .article-excerpt {
    column-count: 1;
  }
}

/* Article Footer */
.article-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-light);
}

/* Read More Button - Newspaper Style */
.read-more-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-family: var(--font-accent);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 0.5rem 1rem;
  border: 2px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-primary);
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.read-more-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--accent-primary);
  transition: left var(--transition-medium);
  z-index: -1;
}

.read-more-btn:hover::before {
  left: 0;
}

.read-more-btn:hover {
  color: var(--bg-secondary);
  border-color: var(--accent-primary);
}

.btn-arrow {
  transition: transform var(--transition-fast);
}

.read-more-btn:hover .btn-arrow {
  transform: translateX(3px);
}

/* Tags */
.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.tag {
  font-size: 0.75rem;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.tag:hover {
  color: var(--accent-secondary);
}

/* ============================================
   POST FULL PAGE
   ============================================ */
.post-full {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-xl) 0;
}

.post-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  padding-bottom: var(--spacing-lg);
}

.post-meta-top {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.post-category {
  background: var(--accent-primary);
  color: var(--bg-secondary);
  padding: 0.25rem 0.75rem;
  font-weight: 700;
}

.post-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.1;
  margin: var(--spacing-lg) 0;
}

.post-subtitle {
  font-family: var(--font-accent);
  font-size: 1.5rem;
  font-style: italic;
  color: var(--text-secondary);
  margin-top: var(--spacing-md);
}

.post-byline {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: var(--spacing-md);
}

.post-divider {
  height: 3px;
  background: var(--border-color);
  margin: var(--spacing-xl) 0;
}

.post-content {
  font-size: 1.125rem;
  line-height: 1.9;
  color: var(--text-primary);
}

.post-content p {
  margin-bottom: var(--spacing-lg);
  text-align: justify;
}

.post-content h2,
.post-content h3,
.post-content h4 {
  font-family: var(--font-display);
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-md);
  line-height: 1.3;
}

.post-content h2 {
  font-size: 2rem;
  border-bottom: 3px double var(--border-color);
  padding-bottom: var(--spacing-sm);
  position: relative;
}

.post-content h2::before {
  content: '◆';
  margin-right: var(--spacing-sm);
  color: var(--accent-primary);
  font-size: 0.8em;
}

.post-content h3 {
  font-size: 1.5rem;
  position: relative;
  padding-left: var(--spacing-md);
}

.post-content h3::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent-primary);
}

.post-content img {
  max-width: 100%;
  height: auto;
  margin: var(--spacing-xl) auto;
  display: block;
  border: 3px solid var(--border-light);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  padding: var(--spacing-sm);
  background: var(--bg-secondary);
}

.post-content blockquote {
  border-left: 4px solid var(--accent-primary);
  padding: var(--spacing-md) var(--spacing-lg);
  margin: var(--spacing-xl) 0;
  font-style: italic;
  color: var(--text-secondary);
  background: var(--code-bg);
  border-right: 4px solid var(--accent-primary);
  position: relative;
  font-size: 1.05em;
}

.post-content blockquote::before {
  content: '"';
  font-family: var(--font-display);
  font-size: 4rem;
  position: absolute;
  left: var(--spacing-md);
  top: -0.5rem;
  color: var(--accent-primary);
  opacity: 0.3;
  line-height: 1;
}

.post-content blockquote p {
  position: relative;
  z-index: 1;
}

.post-content code {
  font-family: 'Courier New', 'Consolas', 'Monaco', monospace;
  background: var(--code-bg);
  color: var(--code-text);
  padding: 0.2em 0.5em;
  border-radius: 3px;
  font-size: 0.88em;
  border: 1px solid var(--code-border);
  font-weight: 500;
}

/* Code blocks with vintage newspaper style */
.post-content pre {
  background: var(--code-block-bg);
  padding: 0;
  overflow: hidden;
  border: 3px double var(--border-color);
  margin: var(--spacing-xl) 0;
  border-radius: 0;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  position: relative;
}

.post-content pre::before {
  content: '— CODE —';
  display: block;
  text-align: center;
  font-family: var(--font-accent);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 2px;
  padding: 0.5rem;
  background: var(--border-color);
  color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.post-content pre code {
  background: transparent;
  border: none;
  padding: var(--spacing-lg);
  font-size: 0.9em;
  color: var(--code-text);
  display: block;
  line-height: 1.7;
  overflow-x: auto;
}

/* Syntax highlighting - Hexo highlight.js output */
.post-content .highlight {
  background: var(--code-block-bg);
  margin: var(--spacing-xl) 0;
  border: 3px double var(--border-color);
  overflow: hidden;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  position: relative;
}

/* Language label for highlight */
.post-content .highlight::before {
  content: '— ' attr(class) ' —';
  content: '— CODE —';
  display: block;
  text-align: center;
  font-family: var(--font-accent);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 2px;
  padding: 0.5rem;
  background: var(--border-color);
  color: var(--bg-secondary);
  text-transform: uppercase;
}

.post-content .highlight table {
  margin: 0;
  width: 100%;
  border: none;
  background: var(--code-block-bg);
}

.post-content .highlight pre {
  margin: 0;
  border: none;
  box-shadow: none;
}

.post-content .highlight pre::before {
  display: none;
}

/* Line numbers gutter */
.post-content .highlight .gutter {
  background: var(--code-gutter-bg);
  border-right: 2px solid var(--border-color);
  padding: var(--spacing-md) var(--spacing-sm);
  text-align: right;
  min-width: 3.5em;
  user-select: none;
}

.post-content .highlight .gutter pre {
  color: var(--text-muted);
  background: transparent;
  padding: 0;
  font-weight: 600;
  font-size: 0.85em;
}

.post-content .highlight .code {
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--code-block-bg);
}

.post-content .highlight .code pre {
  padding: 0;
  background: transparent;
  color: var(--code-text);
  font-size: 0.9em;
  line-height: 1.7;
}

/* Specific syntax colors for newspaper aesthetic - Enhanced */
.post-content .highlight .keyword,
.post-content .highlight .tag {
  color: var(--syntax-keyword);
  font-weight: 700;
}

.post-content .highlight .string,
.post-content .highlight .attr {
  color: var(--syntax-string);
  font-weight: 500;
}

.post-content .highlight .comment {
  color: var(--text-muted);
  font-style: italic;
  opacity: 0.8;
}

.post-content .highlight .number,
.post-content .highlight .literal,
.post-content .highlight .constant {
  color: var(--syntax-number);
  font-weight: 600;
}

.post-content .highlight .function,
.post-content .highlight .title,
.post-content .highlight .class,
.post-content .highlight .built_in {
  color: var(--syntax-function);
  font-weight: 600;
}

.post-content .highlight .variable,
.post-content .highlight .name {
  color: var(--syntax-variable);
}

.post-content .highlight .operator,
.post-content .highlight .punctuation {
  color: var(--text-primary);
  font-weight: 700;
}

.post-content .highlight .meta,
.post-content .highlight .preprocessor {
  color: var(--syntax-meta);
  font-style: italic;
}

.post-content .highlight .regexp,
.post-content .highlight .selector {
  color: var(--syntax-regexp);
}

.post-content .highlight .type,
.post-content .highlight .class-name {
  color: var(--syntax-type);
  font-weight: 600;
}

.post-content .highlight .attribute {
  color: var(--syntax-attribute);
}

.post-content .highlight .deletion {
  background: rgba(255, 0, 0, 0.1);
  color: #c82829;
}

.post-content .highlight .addition {
  background: rgba(0, 255, 0, 0.1);
  color: #718c00;
}

.post-footer {
  margin-top: var(--spacing-2xl);
  padding-top: var(--spacing-lg);
  border-top: 2px solid var(--border-light);
}

.post-tags {
  font-size: 0.875rem;
}

.post-tags strong {
  margin-right: var(--spacing-sm);
}

/* Post Navigation */
.post-nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-2xl);
  padding-top: var(--spacing-xl);
  border-top: 3px double var(--border-color);
}

.post-nav-prev,
.post-nav-next {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  border: 1px solid var(--border-light);
  transition: all var(--transition-fast);
}

.post-nav-prev:hover,
.post-nav-next:hover {
  border-color: var(--accent-primary);
  background: var(--bg-primary);
}

.nav-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
}

.nav-title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
}

/* ============================================
   ARCHIVE PAGE
   ============================================ */
.archive-page {
  padding: var(--spacing-xl) 0;
}

.archive-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 3px double var(--border-color);
}

.archive-title {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 700;
}

.archive-subtitle {
  font-family: var(--font-accent);
  font-style: italic;
  color: var(--text-secondary);
  margin-top: var(--spacing-sm);
}

.archive-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.archive-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--spacing-lg);
  align-items: baseline;
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--border-light);
}

.archive-date {
  font-size: 0.875rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.archive-item-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
}

.archive-category {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--accent-primary);
  white-space: nowrap;
}

/* ============================================
   PAGINATION
   ============================================ */
.pagination-wrapper {
  margin: var(--spacing-2xl) 0;
  padding-top: var(--spacing-xl);
  border-top: 2px solid var(--border-light);
}

.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-sm);
}

.pagination a,
.pagination .current {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-color);
  font-family: var(--font-accent);
  font-size: 0.875rem;
  transition: all var(--transition-fast);
}

.pagination a:hover {
  background: var(--accent-primary);
  color: var(--bg-secondary);
  border-color: var(--accent-primary);
}

.pagination .current {
  background: var(--text-primary);
  color: var(--bg-secondary);
  border-color: var(--text-primary);
}

/* ============================================
   FOOTER
   ============================================ */
.newspaper-footer {
  margin-top: var(--spacing-2xl);
  padding-top: var(--spacing-2xl);
}

.footer-divider {
  height: 3px;
  background: var(--border-color);
  margin-bottom: var(--spacing-xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-section h3 {
  font-family: var(--font-display);
  font-size: 1.125rem;
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--spacing-xs);
  font-size: 0.875rem;
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-light);
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer-bottom p {
  margin: var(--spacing-xs) 0;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
  .newspaper-wrapper {
    padding: var(--spacing-md);
  }
  
  .nav-menu {
    flex-wrap: wrap;
    gap: var(--spacing-md);
  }
  
  .articles-grid {
    grid-template-columns: 1fr;
  }
  
  .article-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
  }
  
  .archive-item {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }
}

/* ============================================
   MATH / LaTeX FORMULAS
   ============================================ */
/* MathJax rendered formulas with newspaper styling */
.post-content .MathJax,
.post-content mjx-container {
  font-size: 1.15em !important;
}

/* Display math (centered, block-level) - Newspaper box style */
.post-content mjx-container[display="true"] {
  margin: var(--spacing-xl) auto;
  padding: var(--spacing-xl);
  background: var(--code-block-bg);
  border: 3px double var(--border-color);
  overflow-x: auto;
  max-width: 100%;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  position: relative;
}

.post-content mjx-container[display="true"]::before {
  content: '— FORMULA —';
  display: block;
  text-align: center;
  font-family: var(--font-accent);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 2px;
  padding: 0.5rem;
  background: var(--border-color);
  color: var(--bg-secondary);
  margin: calc(-1 * var(--spacing-xl)) calc(-1 * var(--spacing-xl)) var(--spacing-md);
}

/* Inline math */
.post-content mjx-container[display="false"] {
  display: inline-block;
  margin: 0 0.2em;
  vertical-align: middle;
  padding: 0.1em 0.3em;
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 3px;
}

/* Ensure formulas are readable in both modes */
body.dark-mode .post-content .MathJax,
body.dark-mode .post-content mjx-container {
  color: var(--text-primary);
}

/* Scrollable overflow for long equations */
.post-content .MathJax_Display {
  overflow-x: auto;
  overflow-y: hidden;
}

/* Math in headers */
.post-content h2 mjx-container,
.post-content h3 mjx-container,
.post-content h4 mjx-container {
  background: transparent;
  border: none;
  padding: 0;
}

/* ============================================
   POST LAYOUT WITH SIDEBAR & TOC
   ============================================ */
.post-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg);
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--spacing-2xl);
  align-items: start;
}

/* TOC & SIDEBAR */
.post-sidebar {
  position: sticky;
  top: var(--spacing-xl);
  max-height: calc(100vh - var(--spacing-2xl));
  overflow-y: auto;
  padding: var(--spacing-lg);
  background: var(--bg-secondary);
  border: 3px double var(--border-color);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.sidebar-title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--border-color);
  position: relative;
}

.sidebar-title::before {
  content: '■';
  margin-right: var(--spacing-sm);
  color: var(--accent-primary);
  font-size: 0.8em;
}

/* Table of Contents */
.sidebar-toc {
  margin-bottom: var(--spacing-xl);
}

.toc-content {
  font-size: 0.875rem;
  line-height: 1.6;
}

.toc-content .toc {
  list-style: none;
  padding-left: 0;
}

.toc-content .toc .toc-item {
  margin: var(--spacing-xs) 0;
}

.toc-content .toc .toc-link {
  color: var(--text-primary);
  text-decoration: none;
  display: block;
  padding: 0.25rem 0.5rem;
  border-left: 2px solid transparent;
  transition: all var(--transition-fast);
}

.toc-content .toc .toc-link:hover {
  color: var(--accent-primary);
  border-left-color: var(--accent-primary);
  padding-left: 0.75rem;
}

.toc-content .toc .toc-link.active {
  color: var(--accent-primary);
  border-left-color: var(--accent-primary);
  font-weight: 600;
}

.toc-content .toc .toc-child {
  padding-left: var(--spacing-md);
  list-style: none;
}

.toc-content .toc-number {
  margin-right: var(--spacing-sm);
  color: var(--text-muted);
  font-weight: 600;
}

/* Author section */
.sidebar-author {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border-light);
}

.author-avatar {
  width: 100px;
  height: 100px;
  margin: 0 auto var(--spacing-md);
  overflow: hidden;
  border: 3px solid var(--border-color);
}

.author-avatar.avatar-rounded {
  border-radius: 50%;
}

.author-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.author-name {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0;
}

/* Social & Links */
.sidebar-social,
.sidebar-links {
  margin-bottom: var(--spacing-lg);
}

.social-links,
.friend-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.social-links li,
.friend-links li {
  margin: var(--spacing-sm) 0;
}

.social-links a,
.friend-links a {
  display: block;
  padding: 0.5rem;
  color: var(--text-primary);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: all var(--transition-fast);
  font-size: 0.875rem;
}

.social-links a:hover,
.friend-links a:hover {
  color: var(--accent-primary);
  border-left-color: var(--accent-primary);
  padding-left: 0.75rem;
  background: var(--code-bg);
}

.social-links a::before {
  content: '➤ ';
  margin-right: var(--spacing-sm);
  color: var(--accent-primary);
  font-size: 0.8em;
}

.friend-links a::before {
  content: '✦ ';
  margin-right: var(--spacing-sm);
  color: var(--accent-secondary);
  font-size: 0.8em;
}

/* Responsive adjustments */
@media (max-width: 1200px) {
  .post-container {
    grid-template-columns: 1fr;
  }
  
  .post-sidebar {
    position: static;
    max-height: none;
    margin-top: var(--spacing-2xl);
  }
}

/* Adjust post-full width when in container */
.post-container .post-full {
  max-width: 100%;
}

/* Footer icon animation */
.footer-icon {
  display: inline-block;
  font-style: normal;
}

.footer-icon.icon-animated {
  animation: heartbeat 1.2s ease-in-out infinite;
}

@keyframes heartbeat {
  0%, 100% { transform: scale(1); }
  10%, 30% { transform: scale(1.1); }
  20%, 40% { transform: scale(1); }
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: var(--spacing-xs);
  font-size: 0.875rem;
}

.footer-since {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-style: italic;
}

/* ============================================
   CATEGORIES & TAGS PAGES
   ============================================ */
   
/* Page Header */
.page-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 3px double var(--border-color);
}

.page-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 2px;
}

.page-subtitle {
  font-family: var(--font-accent);
  font-size: 1.125rem;
  font-style: italic;
  color: var(--text-secondary);
}

/* ============================================
   CATEGORIES PAGE
   ============================================ */
.categories-cloud {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

.category-item {
  background: var(--bg-secondary);
  border: 3px double var(--border-color);
  padding: var(--spacing-lg);
  transition: all var(--transition-medium);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.category-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
  border-color: var(--accent-primary);
}

.category-link {
  text-decoration: none;
  color: inherit;
}

.category-name {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-primary);
}

.category-icon {
  font-size: 1.5rem;
}

.category-count {
  display: inline-block;
  font-size: 0.875rem;
  color: var(--text-muted);
  font-family: var(--font-accent);
  margin-top: var(--spacing-sm);
  padding: 0.25rem 0.75rem;
  background: var(--code-bg);
  border-radius: 3px;
}

.category-posts {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-light);
}

.category-post-item,
.tag-post-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--spacing-md);
  align-items: baseline;
  margin-bottom: var(--spacing-sm);
  padding: var(--spacing-sm);
  transition: background var(--transition-fast);
}

.category-post-item:hover,
.tag-post-item:hover {
  background: var(--code-bg);
}

.category-post-item .post-date,
.tag-post-item .post-date {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  font-weight: 600;
}

.category-post-item .post-title,
.tag-post-item .post-title {
  font-size: 0.875rem;
  color: var(--text-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.category-post-item .post-title:hover,
.tag-post-item .post-title:hover {
  color: var(--accent-primary);
}

.view-all {
  display: inline-block;
  margin-top: var(--spacing-sm);
  font-size: 0.875rem;
  color: var(--accent-primary);
  text-decoration: none;
  font-weight: 600;
  transition: color var(--transition-fast);
}

.view-all:hover {
  color: var(--accent-secondary);
}

/* ============================================
   TAGS PAGE
   ============================================ */
   
/* Tags Cloud */
.tags-cloud-wrapper {
  background: var(--bg-secondary);
  border: 3px double var(--border-color);
  padding: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
  text-align: center;
}

.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-md);
  align-items: center;
}

.tag-cloud-item {
  display: inline-block;
  color: var(--text-primary);
  text-decoration: none;
  padding: 0.5rem 1rem;
  border: 2px solid var(--border-light);
  background: var(--bg-secondary);
  transition: all var(--transition-fast);
  font-family: var(--font-accent);
  font-weight: 600;
  position: relative;
}

.tag-cloud-item:hover {
  color: var(--bg-secondary);
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  transform: scale(1.05);
}

.tag-cloud-item .tag-count {
  font-size: 0.75em;
  opacity: 0.7;
  margin-left: 0.25em;
}

/* Tags List */
.tags-list {
  margin-top: var(--spacing-2xl);
}

.section-title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xl);
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 1px;
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 100px;
  height: 3px;
  background: var(--accent-primary);
  margin: var(--spacing-md) auto 0;
}

.tags-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.tag-item {
  background: var(--bg-secondary);
  border: 2px solid var(--border-light);
  padding: var(--spacing-md);
  transition: all var(--transition-medium);
}

.tag-item:hover {
  border-color: var(--accent-primary);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.tag-link {
  text-decoration: none;
  color: inherit;
}

.tag-name {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-primary);
}

.tag-icon {
  color: var(--accent-primary);
  font-size: 1.25rem;
}

.tag-item .tag-count {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-family: var(--font-accent);
  display: inline-block;
  margin-bottom: var(--spacing-md);
}

.tag-posts {
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-light);
}

/* Responsive */
@media (max-width: 768px) {
  .categories-cloud,
  .tags-grid {
    grid-template-columns: 1fr;
  }
  
  .tags-cloud {
    gap: var(--spacing-sm);
  }
  
  .tag-cloud-item {
    font-size: 0.875rem;
    padding: 0.375rem 0.75rem;
  }
}

/* Page content wrapper */
.page-content {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg);
}

.page-body {
  font-size: 1.125rem;
  line-height: 1.8;
}

.page-body h2,
.page-body h3,
.page-body h4 {
  font-family: var(--font-display);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.page-body h2 {
  font-size: 2rem;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: var(--spacing-sm);
}

.page-body h3 {
  font-size: 1.5rem;
}

.page-body p {
  margin-bottom: var(--spacing-md);
}

.page-body ul,
.page-body ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-xl);
}

.page-body li {
  margin-bottom: var(--spacing-sm);
}

/* ============================================
   CATEGORIES & TAGS PAGES - NEWSPAPER STYLE
   ============================================ */

/* ==================== CATEGORIES ==================== */
.categories-page {
  max-width: 1000px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg);
}

.categories-list .category-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: var(--spacing-lg);
}

.categories-list .category-list-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-top: 3px solid var(--accent-primary);
  padding: var(--spacing-lg);
  transition: all var(--transition-medium);
  position: relative;
}

.categories-list .category-list-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--accent-primary);
}

.categories-list .category-list-item:hover {
  transform: translateX(4px);
  box-shadow: -4px 4px 0 var(--accent-primary);
  border-color: var(--accent-primary);
}

.categories-list .category-list-link {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  display: block;
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.categories-list .category-list-link:hover {
  color: var(--accent-primary);
}

.categories-list .category-list-count {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--bg-secondary);
  background: var(--text-primary);
  padding: 0.25rem 0.75rem;
  font-family: var(--font-accent);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-left: var(--spacing-md);
}

.categories-list .category-list-count::before {
  content: '';
}

.categories-list .category-list-count::after {
  content: ' ARTICLES';
}

.categories-list .category-list-child {
  list-style: none;
  padding-left: var(--spacing-xl);
  margin-top: var(--spacing-md);
  border-left: 2px solid var(--border-light);
}

.categories-list .category-list-child .category-list-item {
  border-top-width: 2px;
  padding: var(--spacing-md);
}

.categories-list .category-list-child .category-list-link {
  font-size: 1.25rem;
}

/* ==================== TAGS ==================== */
.tags-page {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg);
}

.tags-cloud-wrapper {
  background: var(--bg-secondary);
  border: 3px double var(--border-color);
  padding: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
  text-align: center;
  position: relative;
}

.tags-cloud-wrapper::before {
  content: 'TAG CLOUD';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--bg-primary);
  padding: 0 var(--spacing-lg);
  font-family: var(--font-accent);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--text-muted);
}

.tags-cloud-wrapper a {
  display: inline-block;
  color: var(--text-primary) !important;
  text-decoration: none;
  padding: 0.5rem 1rem;
  margin: 0.25rem;
  border: 2px solid transparent;
  background: var(--bg-primary);
  transition: all var(--transition-fast);
  font-family: var(--font-accent);
  font-weight: 600;
}

.tags-cloud-wrapper a::before {
  content: '#';
  color: var(--accent-primary);
  margin-right: 0.25em;
}

.tags-cloud-wrapper a:hover {
  color: var(--bg-secondary) !important;
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  transform: scale(1.05);
}

.tags-list-wrapper {
  margin-top: var(--spacing-2xl);
}

.section-title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xl);
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 2px;
  position: relative;
  padding-bottom: var(--spacing-md);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 3px;
  background: var(--accent-primary);
}

.tags-list .tag-list {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--spacing-md);
}

.tags-list .tag-list-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-left: 3px solid var(--accent-secondary);
  padding: var(--spacing-md);
  transition: all var(--transition-medium);
}

.tags-list .tag-list-item:hover {
  border-color: var(--accent-primary);
  border-left-width: 5px;
  box-shadow: 2px 2px 0 var(--accent-primary);
  transform: translate(-2px, -2px);
}

.tags-list .tag-list-link {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.tags-list .tag-list-link::before {
  content: '#';
  color: var(--accent-primary);
  font-size: 1.25rem;
  margin-right: var(--spacing-sm);
}

.tags-list .tag-list-link:hover {
  color: var(--accent-primary);
}

.tags-list .tag-list-count {
  font-size: 0.75rem;
  color: var(--bg-secondary);
  background: var(--text-primary);
  padding: 0.25rem 0.5rem;
  font-family: var(--font-accent);
  font-weight: 700;
}

.tags-list .tag-list-count::before {
  content: '';
}

.tags-list .tag-list-count::after {
  content: '';
}

@media (max-width: 768px) {
  .tags-list .tag-list {
    grid-template-columns: 1fr;
  }
  
  .tags-cloud-wrapper {
    padding: var(--spacing-xl) var(--spacing-md);
  }
  
  .tags-cloud-wrapper a {
    font-size: 0.875rem;
    padding: 0.375rem 0.75rem;
    margin: 0.125rem;
  }
  
  .categories-list .category-list-link {
    font-size: 1.5rem;
  }
}