/* ============================================
   CSS Variables for Theming
   ============================================ */

:root {
  /* Light theme colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-accent: #e9ecef;
  --text-primary: #212529;
  --text-secondary: #6c757d;
  --text-muted: #adb5bd;
  --accent-color: #0066cc;
  --accent-hover: #0052a3;
  --border-color: #dee2e6;
  --shadow: rgba(0, 0, 0, 0.1);
  --code-bg: #f4f4f4;
  --code-text: #383a42;
  
  /* Spacing & layout */
  --container-max: 1200px;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
  --border-radius: 8px;
  --transition: 0.2s ease;
}

[data-theme="dark"] {
  --bg-primary: #1a1a1a;
  --bg-secondary: #242424;
  --bg-accent: #2d2d2d;
  --text-primary: #e9ecef;
  --text-secondary: #adb5bd;
  --text-muted: #6c757d;
  --accent-color: #4da3ff;
  --accent-hover: #66b3ff;
  --border-color: #3d3d3d;
  --shadow: rgba(0, 0, 0, 0.3);
  --code-bg: #2d2d2d;
  --code-text: #e9ecef;
}

/* ============================================
   Base Styles
   ============================================ */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color var(--transition), color var(--transition);
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  font-weight: 700;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

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

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

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

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

/* ============================================
   Layout
   ============================================ */

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ============================================
   Header & Navigation
   ============================================ */

.site-header {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background-color var(--transition);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  transition: transform var(--transition), opacity var(--transition);
}

.logo:hover {
  transform: scale(1.05);
  opacity: 0.9;
}

.logo-image {
  height: 45px;
  width: auto;
  object-fit: contain;
  display: block;
}

.theme-toggle {
  background: none;
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  width: 40px;
  height: 40px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition), transform var(--transition);
}

.theme-toggle:hover {
  border-color: var(--accent-color);
  transform: scale(1.05);
}

/* Remove focus outline on mouse click, keep for keyboard navigation */
.theme-toggle:focus {
  outline: none;
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

.theme-icon::before {
  content: "☀️";
  font-size: 1.2rem;
}

[data-theme="dark"] .theme-icon::before {
  content: "🌙";
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
  text-align: center;
  padding: var(--spacing-xl) 0;
  animation: fadeIn 0.6s ease-out;
}

.hero-title {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================
   Post Grid
   ============================================ */

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

.post-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
  animation: fadeUp 0.6s ease-out;
}

.post-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 16px var(--shadow);
}

.post-thumbnail {
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
}

.post-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition);
}

.post-card:hover .post-thumbnail img {
  transform: scale(1.05);
}

.post-content {
  padding: var(--spacing-lg);
}

.post-title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

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

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

.post-date {
  display: block;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.post-excerpt {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.tag {
  background-color: var(--bg-accent);
  color: var(--text-secondary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 4px;
  font-size: 0.875rem;
}

.read-more {
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

/* ============================================
   Single Post
   ============================================ */

.post-single {
  max-width: 800px;
  padding: var(--spacing-xl) var(--spacing-lg);
  animation: fadeIn 0.6s ease-out;
}

.post-hero-image {
  margin-bottom: var(--spacing-lg);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.post-title-single {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

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

.post-meta .post-date {
  margin-bottom: 0;
}

.post-meta .post-author::before {
  content: "•";
  margin: 0 var(--spacing-sm);
  color: var(--text-muted);
}

.post-tags-single {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xl);
}

.post-content-single {
  font-size: 1.125rem;
  line-height: 1.8;
  margin-bottom: var(--spacing-xl);
}

.post-content-single h2 {
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.post-content-single h3 {
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.post-content-single img {
  margin: var(--spacing-lg) auto;
  border-radius: var(--border-radius);
  max-width: 100%;
  height: auto;
  display: block;
}

.post-content-single pre {
  background-color: var(--code-bg);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  overflow-x: auto;
  margin: var(--spacing-lg) 0;
  position: relative;
}

/* Copy button for code blocks */
.code-block-wrapper {
  position: relative;
}

.copy-button {
  position: absolute;
  top: 50%;
  right: 8px;
  transform: translateY(-50%);
  background-color: var(--accent-color);
  color: white;
  border: none;
  padding: 6px 12px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 600;
  opacity: 0;
  transition: opacity var(--transition), background-color var(--transition);
  z-index: 10;
}

.code-block-wrapper:hover .copy-button {
  opacity: 1;
}

.copy-button:hover {
  background-color: var(--accent-hover);
}

.copy-button:active {
  transform: scale(0.95);
}

.copy-button.copied {
  background-color: #22c55e;
}

.copy-button:focus {
  outline: none;
}

.copy-button:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

.post-content-single code {
  background-color: var(--code-bg);
  color: var(--code-text);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: "Courier New", monospace;
  font-size: 0.9em;
}

.post-content-single pre code {
  padding: 0;
  background: none;
}

.post-content-single blockquote {
  border-left: 4px solid var(--accent-color);
  padding-left: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  font-style: italic;
  color: var(--text-secondary);
}

.post-content-single ul,
.post-content-single ol {
  margin: var(--spacing-md) 0;
  padding-left: var(--spacing-lg);
}

.post-content-single li {
  margin-bottom: var(--spacing-sm);
}

/* Video container for responsive YouTube embeds */
.video-container {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  height: 0;
  overflow: hidden;
  max-width: 100%;
  margin: var(--spacing-lg) 0;
  border-radius: var(--border-radius);
  background-color: var(--bg-secondary);
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* ============================================
   Post Footer & Share
   ============================================ */

.post-footer {
  border-top: 1px solid var(--border-color);
  padding-top: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.back-to-home {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-lg);
  font-weight: 600;
}

.share-buttons {
  margin-top: var(--spacing-lg);
}

.share-label {
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.share-links {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.share-link {
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--bg-accent);
  border-radius: var(--border-radius);
  font-size: 0.875rem;
  font-weight: 600;
  transition: background-color var(--transition), transform var(--transition);
}

.share-link:hover {
  transform: translateY(-2px);
}

/* ============================================
   Pagination
   ============================================ */

.pagination {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg) 0;
  margin-bottom: var(--spacing-xl);
}

.pagination-link {
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-weight: 600;
  transition: background-color var(--transition);
}

.pagination-link:hover {
  background-color: var(--bg-accent);
}

.pagination-info {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* ============================================
   Footer
   ============================================ */

.site-footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-xl) 0;
  margin-top: var(--spacing-xl);
  text-align: center;
  color: var(--text-secondary);
}

.footer-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
  flex-wrap: wrap;
}

.footer-link {
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: color var(--transition);
}

.footer-link:hover {
  color: var(--accent-color);
}

.footer-separator {
  color: var(--text-muted);
  font-size: 0.875rem;
}
/* ============================================
   Animations
   ============================================ */

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@media (max-width: 768px) {
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .posts-grid {
    grid-template-columns: 1fr;
  }
  
  .post-title-single {
    font-size: 2rem;
  }
  
  .post-content-single {
    font-size: 1rem;
  }
  
  .pagination {
    flex-direction: column;
    gap: var(--spacing-md);
  }
}

/* Extra small devices (phones, 320px to 480px) */
@media (max-width: 480px) {
  html {
    font-size: 14px;
  }
  
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .hero-title {
    font-size: 1.5rem;
    line-height: 1.3;
  }
  
  .hero-subtitle {
    font-size: 0.9rem;
  }
  
  .logo {
    font-size: 1.25rem;
  }
  
  .theme-toggle {
    width: 36px;
    height: 36px;
  }
  
  .post-title {
    font-size: 1.25rem;
  }
  
  .post-title-single {
    font-size: 1.5rem;
    line-height: 1.3;
  }
  
  .post-content-single {
    font-size: 0.95rem;
  }
  
  .post-content-single h2 {
    font-size: 1.5rem;
  }
  
  .post-content-single h3 {
    font-size: 1.25rem;
  }
  
  .post-content-single h4 {
    font-size: 1.1rem;
  }
  
  .post-content-single pre {
    padding: var(--spacing-sm);
    font-size: 0.85rem;
    overflow-x: auto;
  }
  
  .copy-button {
    padding: 4px 8px;
    font-size: 0.7rem;
  }
  
  .post-tags,
  .post-tags-single {
    gap: var(--spacing-xs);
  }
  
  .tag {
    font-size: 0.75rem;
    padding: 2px 6px;
  }
  
  .share-links {
    flex-direction: column;
  }
  
  .share-link {
    width: 100%;
    text-align: center;
  }
  
  .pagination {
    font-size: 0.875rem;
  }
  
  .pagination-link {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.875rem;
  }
  
  /* Table responsiveness */
  .post-content-single table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
  
  /* Image adjustments */
  .post-hero-image {
    margin-left: calc(var(--spacing-md) * -1);
    margin-right: calc(var(--spacing-md) * -1);
    border-radius: 0;
  }
}

/* Very small devices (320px and below) */
@media (max-width: 360px) {
  html {
    font-size: 13px;
  }
  
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .hero-title {
    font-size: 1.35rem;
  }
  
  .logo {
    font-size: 1.1rem;
  }
  
  .post-title-single {
    font-size: 1.35rem;
  }
  
  .post-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-xs);
  }
  
  .post-meta .post-author::before {
    content: "";
    margin: 0;
  }
}

/* Extreme small devices (280px and below - feature phones) */
@media (max-width: 320px) {
  html {
    font-size: 12px;
  }
  
  body {
    overflow-x: hidden;
  }
  
  .container {
    padding: 0 8px;
    max-width: 100%;
  }
  
  /* Header adjustments */
  .site-header {
    padding: 8px 0;
  }
  
  .logo-image {
    height: 32px;
  }
  
  .theme-toggle {
    width: 32px;
    height: 32px;
  }
  
  .theme-icon::before {
    font-size: 1rem;
  }
  
  /* Hero section */
  .hero {
    padding: var(--spacing-lg) 0;
  }
  
  .hero-title {
    font-size: 1.25rem;
    line-height: 1.2;
  }
  
  .hero-subtitle {
    font-size: 0.85rem;
  }
  
  /* Post cards */
  .post-card {
    border-radius: 4px;
  }
  
  .post-content {
    padding: 12px;
  }
  
  .post-title {
    font-size: 1.1rem;
  }
  
  .post-excerpt {
    font-size: 0.9rem;
  }
  
  /* Single post */
  .post-single {
    padding: var(--spacing-lg) 8px;
  }
  
  .post-title-single {
    font-size: 1.25rem;
    line-height: 1.25;
    word-wrap: break-word;
  }
  
  .post-content-single {
    font-size: 0.9rem;
    line-height: 1.6;
  }
  
  .post-content-single h2 {
    font-size: 1.35rem;
    word-wrap: break-word;
  }
  
  .post-content-single h3 {
    font-size: 1.15rem;
  }
  
  .post-content-single h4 {
    font-size: 1rem;
  }
  
  /* Code blocks */
  .post-content-single pre {
    padding: 8px;
    font-size: 0.8rem;
    margin: var(--spacing-md) -8px;
    border-radius: 0;
  }
  
  .post-content-single code {
    font-size: 0.8rem;
    padding: 1px 4px;
    word-break: break-all;
  }
  
  .copy-button {
    padding: 3px 6px;
    font-size: 0.65rem;
    top: 4px;
    right: 4px;
  }
  
  /* Lists */
  .post-content-single ul,
  .post-content-single ol {
    padding-left: var(--spacing-md);
  }
  
  /* Tags */
  .tag {
    font-size: 0.7rem;
    padding: 2px 4px;
  }
  
  /* Blockquotes */
  .post-content-single blockquote {
    padding-left: var(--spacing-sm);
    border-left-width: 3px;
    font-size: 0.9rem;
  }
  
  /* Images */
  .post-hero-image {
    margin-left: -8px;
    margin-right: -8px;
  }
  
  .post-content-single img {
    margin-left: -8px;
    margin-right: -8px;
    width: calc(100% + 16px);
    max-width: none;
  }
  
  /* Share buttons */
  .share-link {
    padding: 6px 12px;
    font-size: 0.8rem;
  }
  
  .share-label {
    font-size: 0.9rem;
  }
  
  /* Footer */
  .site-footer {
    padding: var(--spacing-lg) 0;
    font-size: 0.85rem;
  }
  
  /* Pagination */
  .pagination-link {
    padding: 6px 10px;
    font-size: 0.8rem;
  }
  
  .pagination-info {
    font-size: 0.8rem;
  }
  
  /* CTA button */
  .cta-button a {
    padding: 8px 16px;
    font-size: 0.9rem;
  }
  
  /* Prevent horizontal overflow */
  * {
    max-width: 100%;
    word-wrap: break-word;
    overflow-wrap: break-word;
  }
  
  pre,
  code {
    max-width: calc(100vw - 16px);
  }
}

/* ============================================
   Utility Classes
   ============================================ */

.no-posts {
  text-align: center;
  padding: var(--spacing-xl);
  color: var(--text-secondary);
}