/* ============================================================
   Chúi's Tech Blog — Main Stylesheet
   Theme: Tactile-inspired, fully responsive
   ============================================================ */

/* CSS Variables */
:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-secondary: #64748b;
  --color-accent: #f59e0b;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-bg-dark: #0f172a;
  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-text-inverse: #f8fafc;
  --color-border: #e2e8f0;
  --color-code-bg: #f1f5f9;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;
  --max-width: 1200px;
  --max-content-width: 800px;
  --navbar-height: 64px;
  --border-radius: 8px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --transition: all 0.2s ease;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ============================================================
   Navigation
   ============================================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--navbar-height);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: var(--transition);
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-text);
  font-weight: 700;
  font-size: 1.25rem;
  text-decoration: none;
}

.navbar-brand:hover {
  text-decoration: none;
  color: var(--color-primary);
}

.navbar-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--color-border);
}

.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.navbar-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: var(--transition);
}

.navbar-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

.navbar-menu a {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.5rem 0;
  position: relative;
  text-decoration: none;
}

.navbar-menu a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: var(--transition);
}

.navbar-menu a:hover::after,
.navbar-menu a.active::after {
  width: 100%;
}

/* ============================================================
   Main Content
   ============================================================ */
.main-content {
  margin-top: var(--navbar-height);
  min-height: calc(100vh - var(--navbar-height) - 200px);
  padding: 3rem 0;
}

/* ============================================================
   Hero Section
   ============================================================ */
.hero-section {
  text-align: center;
  padding: 4rem 0;
  background: linear-gradient(135deg, var(--color-bg-alt) 0%, var(--color-bg) 100%);
  border-radius: var(--border-radius);
  margin-bottom: 4rem;
}

.hero-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 1.5rem;
  border: 4px solid var(--color-primary);
  box-shadow: var(--shadow-lg);
}

.hero-content h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

.hero-tagline {
  font-size: 1.25rem;
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: 1rem;
}

.hero-description {
  font-size: 1.1rem;
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto 2rem;
}

.hero-links {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius);
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition);
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-primary {
  background: var(--color-primary);
  color: white;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: white;
}

.btn-secondary {
  background: var(--color-bg);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: white;
}

/* ============================================================
   Posts Grid (Home)
   ============================================================ */
.recent-posts {
  max-width: var(--max-content-width);
  margin: 0 auto 4rem;
}

.recent-posts h2,
.topics-section h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 2rem;
  color: var(--color-text);
}

.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.post-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: var(--transition);
}

.post-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.post-card-content {
  padding: 1.5rem;
}

.post-category {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--color-bg-alt);
  color: var(--color-primary);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  border-radius: 20px;
  margin-bottom: 0.75rem;
}

.post-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  line-height: 1.4;
}

.post-card h3 a {
  color: var(--color-text);
  text-decoration: none;
}

.post-card h3 a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.post-excerpt {
  color: var(--color-text-light);
  font-size: 0.95rem;
  margin-bottom: 1rem;
  line-height: 1.6;
}

.post-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--color-text-light);
}

.post-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tag {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  background: var(--color-bg-alt);
  color: var(--color-secondary);
  font-size: 0.75rem;
  border-radius: 4px;
  transition: var(--transition);
}

.tag:hover {
  background: var(--color-primary);
  color: white;
}

.view-all {
  text-align: center;
}

/* ============================================================
   Topics Section
   ============================================================ */
.topics-section {
  max-width: var(--max-content-width);
  margin: 0 auto 4rem;
}

.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.topic-card {
  padding: 1.5rem;
  background: var(--color-bg-alt);
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border);
  transition: var(--transition);
}

.topic-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.topic-icon {
  font-size: 2rem;
  display: block;
  margin-bottom: 0.75rem;
}

.topic-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

.topic-card p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.5;
}

/* ============================================================
   Blog Listing Page
   ============================================================ */
.blog-header {
  text-align: center;
  margin-bottom: 3rem;
}

.blog-header h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.blog-header p {
  color: var(--color-text-light);
  font-size: 1.1rem;
}

.blog-posts {
  max-width: var(--max-content-width);
  margin: 0 auto;
}

.blog-post-item {
  padding: 2rem 0;
  border-bottom: 1px solid var(--color-border);
}

.blog-post-item:first-child {
  padding-top: 0;
}

.blog-post-item:last-child {
  border-bottom: none;
}

.blog-post-category {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--color-bg-alt);
  color: var(--color-primary);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  border-radius: 20px;
  margin-bottom: 0.75rem;
}

.blog-post-item h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.blog-post-item h2 a {
  color: var(--color-text);
  text-decoration: none;
}

.blog-post-item h2 a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.blog-post-meta {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 0.75rem;
}

.blog-post-excerpt {
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.blog-post-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.pagination a,
.pagination span {
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius);
  font-weight: 500;
  transition: var(--transition);
}

.pagination a {
  color: var(--color-text);
  border: 1px solid var(--color-border);
  text-decoration: none;
}

.pagination a:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  text-decoration: none;
}

.pagination .current {
  background: var(--color-primary);
  color: white;
  border: 1px solid var(--color-primary);
}

/* ============================================================
   Post Layout
   ============================================================ */
.post-header {
  text-align: center;
  padding: 3rem 0;
  background: var(--color-bg-alt);
  margin-bottom: 3rem;
}

.post-category-badge {
  display: inline-block;
  padding: 0.35rem 1rem;
  background: var(--color-primary);
  color: white;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  border-radius: 20px;
  margin-bottom: 1rem;
}

.post-header h1 {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 1rem;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.post-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  color: var(--color-text-light);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.meta-separator {
  color: var(--color-border);
}

.post-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.post-tags .tag {
  padding: 0.3rem 0.8rem;
  font-size: 0.85rem;
}

/* Post Content */
.post-content {
  max-width: var(--max-content-width);
  margin: 0 auto;
  font-size: 1.1rem;
  line-height: 1.8;
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
  font-weight: 700;
  margin-top: 2rem;
  margin-bottom: 1rem;
  line-height: 1.4;
}

.post-content h1 { font-size: 2rem; }
.post-content h2 { font-size: 1.75rem; }
.post-content h3 { font-size: 1.5rem; }
.post-content h4 { font-size: 1.25rem; }

.post-content p {
  margin-bottom: 1.5rem;
}

.post-content ul,
.post-content ol {
  margin-bottom: 1.5rem;
  padding-left: 2rem;
}

.post-content li {
  margin-bottom: 0.5rem;
}

.post-content a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 3px;
}

.post-content a:hover {
  text-decoration-color: var(--color-primary);
}

.post-content blockquote {
  margin: 2rem 0;
  padding: 1.5rem 2rem;
  border-left: 4px solid var(--color-primary);
  background: var(--color-bg-alt);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  font-style: italic;
  color: var(--color-text-light);
}

.post-content blockquote p {
  margin-bottom: 0;
}

.post-content code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 0.2rem 0.4rem;
  background: var(--color-code-bg);
  border-radius: 4px;
  color: var(--color-primary-dark);
}

.post-content pre {
  margin: 2rem 0;
  padding: 1.5rem;
  background: var(--color-bg-dark);
  border-radius: var(--border-radius);
  overflow-x: auto;
  position: relative;
}

.post-content pre code {
  background: none;
  padding: 0;
  color: var(--color-text-inverse);
  font-size: 0.9rem;
  line-height: 1.6;
}

.post-content pre::before {
  content: attr(data-lang);
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  font-size: 0.75rem;
  color: var(--color-text-light);
  text-transform: uppercase;
}

.post-content img {
  border-radius: var(--border-radius);
  margin: 2rem 0;
  box-shadow: var(--shadow-md);
}

.post-content figure {
  margin: 2rem 0;
}

.post-content figcaption {
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-top: 0.75rem;
  font-style: italic;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  overflow-x: auto;
  display: block;
}

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

.post-content th {
  background: var(--color-bg-alt);
  font-weight: 600;
}

.post-content hr {
  border: none;
  height: 1px;
  background: var(--color-border);
  margin: 3rem 0;
}

/* Share Buttons */
.post-share {
  max-width: var(--max-content-width);
  margin: 3rem auto;
  padding: 2rem;
  background: var(--color-bg-alt);
  border-radius: var(--border-radius);
  text-align: center;
}

.post-share h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.share-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.share-btn {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  border-radius: var(--border-radius);
  font-weight: 500;
  font-size: 0.9rem;
  color: white;
  text-decoration: none;
  transition: var(--transition);
}

.share-btn:hover {
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.share-btn.linkedin { background: #0077b5; }
.share-btn.facebook { background: #1877f2; }
.share-btn.twitter { background: #1da1f2; }

/* Author Bio */
.post-author-bio {
  max-width: var(--max-content-width);
  margin: 0 auto 3rem;
}

.author-bio-card {
  display: flex;
  gap: 1.5rem;
  padding: 2rem;
  background: var(--color-bg-alt);
  border-radius: var(--border-radius);
  align-items: center;
}

.author-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--color-primary);
  flex-shrink: 0;
}

.author-info h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.author-info p {
  color: var(--color-text-light);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Related Posts */
.related-posts {
  max-width: var(--max-content-width);
  margin: 0 auto 3rem;
}

.related-posts h3 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
}

.related-posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1rem;
}

.related-post-card {
  padding: 1.25rem;
  background: var(--color-bg-alt);
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border);
  transition: var(--transition);
  text-decoration: none;
}

.related-post-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}

.related-post-card h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--color-text);
  line-height: 1.4;
}

.related-post-card time {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

/* ============================================================
   About Page
   ============================================================ */
.about-page {
  max-width: var(--max-content-width);
  margin: 0 auto;
}

.about-header {
  text-align: center;
  margin-bottom: 3rem;
}

.about-avatar {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 1.5rem;
  border: 4px solid var(--color-primary);
  box-shadow: var(--shadow-lg);
}

.about-header h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.about-header p {
  color: var(--color-text-light);
  font-size: 1.1rem;
}

.about-content {
  font-size: 1.1rem;
  line-height: 1.8;
}

.about-content h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
}

.about-content p {
  margin-bottom: 1.5rem;
}

.about-content ul {
  margin-bottom: 1.5rem;
  padding-left: 2rem;
}

.about-content li {
  margin-bottom: 0.5rem;
}

.about-topics {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}

.about-topic {
  padding: 1.25rem;
  background: var(--color-bg-alt);
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border);
}

.about-topic h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.about-topic p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
  background: var(--color-bg-dark);
  color: var(--color-text-inverse);
  padding: 3rem 0 1.5rem;
  margin-top: 4rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-brand {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.footer-avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--color-primary);
}

.footer-brand h3 {
  font-size: 1.25rem;
  margin-bottom: 0.25rem;
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--color-text-light);
}

.footer-links h4,
.footer-social h4 {
  font-size: 1rem;
  margin-bottom: 1rem;
  color: var(--color-text-inverse);
}

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

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: var(--color-text-light);
  font-size: 0.95rem;
}

.footer-links a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.social-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.social-links a {
  color: var(--color-text-light);
  font-size: 0.95rem;
  padding: 0.25rem 0.75rem;
  border: 1px solid var(--color-text-light);
  border-radius: 4px;
  transition: var(--transition);
}

.social-links a:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  text-decoration: none;
}

.footer-bottom {
  text-align: center;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.9rem;
  color: var(--color-text-light);
}

.footer-bottom p {
  margin-bottom: 0.25rem;
}

/* ============================================================
   Responsive Design
   ============================================================ */

/* Tablet */
@media (max-width: 768px) {
  :root {
    --navbar-height: 56px;
  }

  .navbar-toggle {
    display: flex;
  }

  .navbar-menu {
    display: none;
    position: absolute;
    top: var(--navbar-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    flex-direction: column;
    padding: 1rem;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    gap: 0;
  }

  .navbar-menu.active {
    display: flex;
  }

  .navbar-menu li {
    width: 100%;
  }

  .navbar-menu a {
    display: block;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--color-border);
  }

  .navbar-menu a::after {
    display: none;
  }

  .hero-section {
    padding: 2rem 0;
  }

  .hero-avatar {
    width: 100px;
    height: 100px;
  }

  .hero-content h1 {
    font-size: 2rem;
  }

  .hero-tagline {
    font-size: 1.1rem;
  }

  .hero-description {
    font-size: 1rem;
  }

  .posts-grid {
    grid-template-columns: 1fr;
  }

  .topics-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  }

  .post-header h1 {
    font-size: 2rem;
  }

  .post-content {
    font-size: 1rem;
  }

  .author-bio-card {
    flex-direction: column;
    text-align: center;
  }

  .author-avatar {
    width: 60px;
    height: 60px;
  }

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-brand {
    flex-direction: column;
    text-align: center;
  }

  .social-links {
    justify-content: center;
  }
}

/* Mobile */
@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }

  .hero-content h1 {
    font-size: 1.75rem;
  }

  .hero-links {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 250px;
    text-align: center;
  }

  .posts-grid {
    grid-template-columns: 1fr;
  }

  .topics-grid {
    grid-template-columns: 1fr;
  }

  .post-header h1 {
    font-size: 1.5rem;
  }

  .post-meta {
    flex-direction: column;
    gap: 0.25rem;
  }

  .meta-separator {
    display: none;
  }

  .share-buttons {
    flex-direction: column;
    align-items: center;
  }

  .share-btn {
    width: 100%;
    max-width: 200px;
    text-align: center;
  }

  .related-posts-grid {
    grid-template-columns: 1fr;
  }

  .about-topics {
    grid-template-columns: 1fr;
  }
}

/* Print */
@media print {
  .navbar,
  .footer,
  .post-share,
  .related-posts {
    display: none;
  }

  .main-content {
    margin-top: 0;
  }

  .post-content {
    font-size: 12pt;
    line-height: 1.5;
  }
}

/* Dark Mode (optional, browser preference) */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f172a;
    --color-bg-alt: #1e293b;
    --color-text: #f8fafc;
    --color-text-light: #94a3b8;
    --color-border: #334155;
    --color-code-bg: #1e293b;
  }

  .navbar {
    background: var(--color-bg);
  }

  .navbar-avatar {
    border-color: var(--color-border);
  }

  .post-content pre {
    background: #020617;
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}

/* Focus styles */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Selection */
::selection {
  background: var(--color-primary);
  color: white;
}