/* ============================================================
   WOODIE'S BLOG — Main Stylesheet
   Modern, Minimal, Developer-style Dark Theme
   Inspired by Vercel / GitHub / Medium
   ============================================================ */

/* ============================================================
   CSS Custom Properties (Theme Tokens)
   ============================================================ */
:root {
  /* Dark theme (default) */
  --bg:          #0D1117;
  --surface:     #161B22;
  --primary:     #58A6FF;
  --text:        #C9D1D9;
  --text-secondary: #8B949E;
  --border:      #30363D;
  --hover:       #21262D;
  --code-bg:     #1a1f2b;
  --shadow:      0 1px 3px rgba(0,0,0,0.3);
  --shadow-lg:   0 8px 32px rgba(0,0,0,0.4);
  --radius:      8px;
  --radius-lg:   12px;
  --transition:  0.2s ease;
  --max-width:   720px;
  --nav-height:  64px;
}

[data-theme="light"] {
  --bg:          #FFFFFF;
  --surface:     #F6F8FA;
  --primary:     #0969DA;
  --text:        #1F2328;
  --text-secondary: #656D76;
  --border:      #D0D7DE;
  --hover:       #F3F4F6;
  --code-bg:     #f0f2f5;
  --shadow:      0 1px 3px rgba(0,0,0,0.08);
  --shadow-lg:   0 8px 32px rgba(0,0,0,0.1);
}

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

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
  opacity: 0.85;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
}

::selection {
  background: var(--primary);
  color: #fff;
}

/* ============================================================
   Navbar
   ============================================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(13, 17, 23, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: background var(--transition), border-color var(--transition);
}

[data-theme="light"] .navbar {
  background: rgba(255, 255, 255, 0.8);
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 700;
  font-size: 1.1rem;
  transition: opacity var(--transition);
}

.nav-logo:hover {
  opacity: 1;
  color: var(--text);
}

.logo-img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  object-fit: cover;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 6px;
  transition: color var(--transition), background var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text);
  background: var(--hover);
  opacity: 1;
}

.nav-link.active {
  color: var(--primary);
}

/* Theme Toggle */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
  margin-left: 4px;
}

.theme-toggle:hover {
  color: var(--text);
  background: var(--hover);
  border-color: var(--text-secondary);
}

[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; }
[data-theme="light"] .icon-sun { display: block; }
[data-theme="light"] .icon-moon { display: none; }

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.nav-hamburger.active span:nth-child(2) {
  opacity: 0;
}
.nav-hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu */
.mobile-menu {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 12px 24px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.mobile-menu.open {
  display: flex;
}

.mobile-link {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 10px 12px;
  border-radius: 6px;
  transition: color var(--transition), background var(--transition);
}

.mobile-link:hover,
.mobile-link.active {
  color: var(--text);
  background: var(--hover);
  opacity: 1;
}

/* ============================================================
   Main Content
   ============================================================ */
.main-content {
  flex: 1;
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: calc(var(--nav-height) + 40px) 24px 60px;
}

/* ============================================================
   Home Page — Hero
   ============================================================ */
.hero {
  margin-bottom: 48px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 540px;
  line-height: 1.6;
}

/* ============================================================
   Search
   ============================================================ */
.search-wrapper {
  margin-bottom: 32px;
}

.search-input {
  width: 100%;
  padding: 12px 16px 12px 44px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.95rem;
  font-family: inherit;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.15);
}

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

.search-container {
  position: relative;
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
  pointer-events: none;
}

/* ============================================================
   Filter Bar (Category + Tag dropdowns)
   ============================================================ */
.filter-bar {
  display: flex;
  align-items: flex-end;
  gap: 12px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.filter-reset-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0 22px;
  height: 42px;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
}

.filter-reset-btn:hover {
  color: var(--primary);
  border-color: var(--primary);
  background: rgba(88, 166, 255, 0.08);
}

.filter-reset-btn svg {
  opacity: 0.7;
}

.filter-dropdown {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  flex: 1;
  min-width: 160px;
  max-width: 220px;
}

.filter-label {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.filter-label svg {
  opacity: 0.6;
}

.filter-select {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  padding: 10px 36px 10px 14px;
  height: 42px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238b949e' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
}

.filter-select:hover {
  border-color: var(--primary);
  background-color: var(--hover, rgba(88, 166, 255, 0.04));
}

.filter-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.15);
}

.filter-select option {
  background: var(--surface);
  color: var(--text);
  padding: 8px;
}

/* Active state when a filter is selected */
.filter-select.has-value {
  border-color: var(--primary);
  color: var(--primary);
}

@media (max-width: 600px) {
  .filter-bar {
    gap: 10px;
  }
  .filter-dropdown {
    max-width: none;
    flex: 1 1 calc(50% - 10px);
  }
  .filter-reset-btn {
    flex: 0 0 auto;
  }
}

.post-card-category {
  padding: 2px 8px;
  background: rgba(88, 166, 255, 0.12);
  color: var(--primary);
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

/* ============================================================
   Post Cards (Home page list)
   ============================================================ */
.posts-grid {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.post-card {
  display: block;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  animation: fadeInUp 0.4s ease forwards;
  opacity: 0;
}

.post-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  opacity: 1;
}

.post-card:nth-child(1) { animation-delay: 0.05s; }
.post-card:nth-child(2) { animation-delay: 0.1s; }
.post-card:nth-child(3) { animation-delay: 0.15s; }
.post-card:nth-child(4) { animation-delay: 0.2s; }
.post-card:nth-child(5) { animation-delay: 0.25s; }
.post-card:nth-child(6) { animation-delay: 0.3s; }
.post-card:nth-child(7) { animation-delay: 0.35s; }
.post-card:nth-child(8) { animation-delay: 0.4s; }

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.post-card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

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

.post-card-title {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.post-card:hover .post-card-title {
  color: var(--primary);
}

.post-card-excerpt {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
}

.tag-link {
  padding: 3px 10px;
  background: rgba(88, 166, 255, 0.1);
  color: var(--primary);
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 500;
  transition: background var(--transition);
}

.tag-link:hover {
  background: rgba(88, 166, 255, 0.2);
  opacity: 1;
}

.no-results {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-secondary);
  font-size: 1.05rem;
  display: none;
}

/* ============================================================
   Category Page (single category — folder post list)
   ============================================================ */
.category-page {
  max-width: var(--max-width);
  margin: 0 auto;
}

.category-header {
  margin-bottom: 32px;
}

.category-back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  transition: color var(--transition);
}

.category-back-link:hover {
  color: var(--primary);
  opacity: 1;
}

.category-title-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.category-title-row .folder-icon {
  color: var(--primary);
  flex-shrink: 0;
}

.category-page-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}

.category-page-count {
  font-size: 1rem;
  color: var(--text-secondary);
  font-weight: 400;
}

/* Post list (dotted leader style) */
.folder-post-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.folder-post-item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}

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

.folder-post-bullet {
  color: var(--text-secondary);
  flex-shrink: 0;
  font-size: 1.1rem;
  line-height: 1;
}

.folder-post-link {
  color: var(--primary);
  font-size: 0.95rem;
  font-weight: 500;
  white-space: nowrap;
  transition: color var(--transition);
}

.folder-post-link:hover {
  color: var(--text);
  opacity: 1;
}

.folder-post-dots {
  flex: 1;
  border-bottom: 2px dotted var(--border);
  min-width: 20px;
  margin-bottom: 4px;
}

.folder-post-date {
  color: var(--text-secondary);
  font-size: 0.82rem;
  white-space: nowrap;
  flex-shrink: 0;
}

/* ============================================================
   Categories Index Page (folder tree)
   ============================================================ */
.categories-index {
  max-width: var(--max-width);
  margin: 0 auto;
}

.folder-tree {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

/* Parent folder row */
.folder-parent {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 12px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition);
}

.folder-parent:hover {
  border-color: var(--primary);
  background: var(--hover, rgba(88, 166, 255, 0.04));
}

.folder-chevron {
  color: var(--text-secondary);
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.folder-group[data-open="false"] .folder-chevron {
  transform: rotate(-90deg);
}

.folder-icon {
  color: var(--primary);
  flex-shrink: 0;
}

.folder-name {
  font-weight: 600;
  color: var(--text);
}

.folder-meta {
  margin-left: auto;
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 400;
}

/* Children container */
.folder-children {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: 28px;
  overflow: hidden;
  transition: max-height 0.25s ease, opacity 0.2s ease;
}

.folder-group[data-open="false"] .folder-children {
  max-height: 0 !important;
  opacity: 0;
  pointer-events: none;
}

.folder-group[data-open="true"] .folder-children {
  opacity: 1;
}

/* Child folder row */
.folder-child {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: var(--radius);
  transition: background var(--transition);
}

.folder-child:hover {
  background: var(--hover, rgba(88, 166, 255, 0.04));
  opacity: 1;
}

.folder-child-name {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--primary);
}

.folder-child-count {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-left: 4px;
}

@media (max-width: 600px) {
  .folder-post-link {
    white-space: normal;
    font-size: 0.88rem;
  }
  .category-page-title {
    font-size: 1.5rem;
  }
  .folder-parent {
    padding: 10px 12px;
    font-size: 0.88rem;
  }
}
}

@media (max-width: 768px) {
  .category-children {
    padding-left: 0;
    grid-template-columns: 1fr;
  }

  .category-page-title {
    font-size: 1.5rem;
  }
}

/* ============================================================
   Pagination
   ============================================================ */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.pagination-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), color var(--transition);
}

.pagination-link:hover:not(.disabled):not(:disabled) {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--hover);
  opacity: 1;
}

.pagination-link.disabled,
.pagination-link:disabled {
  color: var(--text-secondary);
  opacity: 0.4;
  pointer-events: none;
  cursor: default;
}

.pagination-info {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ============================================================
   Post Full (Single Post Page)
   ============================================================ */
.post-wrapper {
  display: flex;
  gap: 24px;
  max-width: 1100px;
  margin: 0 auto;
  position: relative;
}

.post-full {
  max-width: var(--max-width);
  margin: 0 auto;
  flex: 1;
  min-width: 0;
}

/* ============================================================
   Table of Contents Sidebar (HackMD style)
   ============================================================ */
.toc-sidebar {
  position: sticky;
  top: calc(var(--nav-height) + 24px);
  align-self: flex-start;
  width: 250px;
  flex-shrink: 0;
  order: -1;
  max-height: calc(100vh - var(--nav-height) - 48px);
  z-index: 10;
}

.toc-container {
  position: relative;
}

.toc-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: color var(--transition), background var(--transition);
}

.toc-toggle:hover {
  color: var(--text);
  background: var(--hover);
}

.toc-content {
  padding: 0 8px 0 0;
  overflow-y: auto;
  max-height: calc(100vh - var(--nav-height) - 48px);
}

.toc-content::-webkit-scrollbar {
  width: 3px;
}

.toc-content::-webkit-scrollbar-track {
  background: transparent;
}

.toc-content::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

.toc-title {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
  line-height: 1.35;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.toc-nav {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.toc-link {
  display: block;
  padding: 4px 0;
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.4;
  transition: color var(--transition);
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.toc-link:hover {
  color: var(--text);
  opacity: 1;
}

.toc-link.active {
  color: var(--text);
}

.toc-link[data-level="3"] {
  padding-left: 16px;
}

.toc-link[data-level="4"] {
  padding-left: 32px;
}

.toc-actions {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 14px;
}

.toc-action {
  background: none;
  border: none;
  padding: 4px 0;
  font-size: 0.82rem;
  font-family: inherit;
  color: var(--text-secondary);
  text-align: left;
  cursor: pointer;
  transition: color var(--transition);
}

.toc-action:hover {
  color: var(--text);
}

.toc-action-primary {
  color: var(--primary);
}

.toc-action-primary:hover {
  color: var(--primary);
  opacity: 0.8;
}

/* Mobile TOC */
@media (max-width: 1024px) {
  .post-wrapper {
    flex-direction: column;
  }

  .toc-sidebar {
    position: fixed;
    top: auto;
    bottom: 16px;
    left: 16px;
    width: auto;
    max-height: none;
    z-index: 100;
  }

  .toc-toggle {
    display: inline-flex;
    box-shadow: var(--shadow-lg);
  }

  .toc-content {
    display: none;
    position: absolute;
    bottom: 44px;
    left: 0;
    width: 280px;
    max-height: 60vh;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 16px;
    box-shadow: var(--shadow-lg);
  }

  .toc-sidebar.open .toc-content {
    display: block;
  }
}

.post-header {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.post-tags-inline {
  display: inline-flex;
  gap: 6px;
}

.post-title-full {
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.post-description {
  margin-top: 12px;
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================================
   Post Content (Markdown rendered)
   ============================================================ */
.post-content {
  font-size: 1.05rem;
  line-height: 1.8;
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
  color: var(--text);
  font-weight: 600;
  margin-top: 2em;
  margin-bottom: 0.75em;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.post-content h1 { font-size: 1.8rem; }
.post-content h2 { font-size: 1.5rem; border-bottom: 1px solid var(--border); padding-bottom: 0.4em; }
.post-content h3 { font-size: 1.25rem; }
.post-content h4 { font-size: 1.1rem; }

.post-content p {
  margin-bottom: 1.25em;
}

.post-content a {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(88, 166, 255, 0.3);
  transition: text-decoration-color var(--transition);
}

.post-content a:hover {
  text-decoration-color: var(--primary);
  opacity: 1;
}

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

.post-content blockquote {
  margin: 1.5em 0;
  padding: 12px 20px;
  border-left: 3px solid var(--primary);
  background: var(--surface);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text-secondary);
}

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

.post-content ul,
.post-content ol {
  margin-bottom: 1.25em;
  padding-left: 1.5em;
}

.post-content li {
  margin-bottom: 0.4em;
}

.post-content li::marker {
  color: var(--text-secondary);
}

/* Inline code */
.post-content code {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--primary);
}

/* Code blocks */
.post-content pre {
  margin: 1.5em 0;
  padding: 20px;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  position: relative;
}

.post-content pre code {
  background: none;
  padding: 0;
  color: var(--text);
  font-size: 0.85rem;
  line-height: 1.6;
}

.code-copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-secondary);
  font-size: 0.72rem;
  font-family: inherit;
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--transition), color var(--transition), background var(--transition);
}

.post-content pre:hover .code-copy-btn {
  opacity: 1;
}

.code-copy-btn:hover {
  color: var(--text);
  background: var(--hover);
  border-color: var(--text-secondary);
}

.code-copy-btn.copied {
  color: #3fb950;
  border-color: #3fb950;
  opacity: 1;
}

/* Tables */
.post-content table {
  width: 100%;
  margin: 1.5em 0;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.post-content th,
.post-content td {
  padding: 10px 14px;
  border: 1px solid var(--border);
  text-align: left;
}

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

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

.post-content tr:hover td {
  background: var(--hover);
}

/* Horizontal rule */
.post-content hr {
  margin: 2em 0;
  border: none;
  border-top: 1px solid var(--border);
}

/* Images in post */
.post-content img {
  margin: 1.5em auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

/* ============================================================
   Post Footer
   ============================================================ */
.post-footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
}

.back-link:hover {
  color: var(--primary);
  background: var(--hover);
  opacity: 1;
}

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

.page-header {
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.page-title {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.page-body {
  font-size: 1.05rem;
  line-height: 1.8;
}

.page-body p {
  margin-bottom: 1.25em;
}

.page-body a {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(88, 166, 255, 0.3);
}

.page-body a:hover {
  text-decoration-color: var(--primary);
}

.page-body ul,
.page-body ol {
  margin-bottom: 1.25em;
  padding-left: 1.5em;
}

.page-body li {
  margin-bottom: 0.4em;
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
  margin-top: auto;
  padding: 32px 24px;
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.footer-container {
  max-width: 1100px;
  margin: 0 auto;
  text-align: center;
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.footer-copyright {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.footer-links {
  display: flex;
  gap: 16px;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  font-size: 0.85rem;
  transition: color var(--transition);
}

.footer-link:hover {
  color: var(--primary);
  opacity: 1;
}

.footer-powered {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.footer-powered a {
  color: var(--text-secondary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.footer-powered a:hover {
  color: var(--primary);
}

/* ============================================================
   404 Page
   ============================================================ */
.error-page {
  text-align: center;
  padding: 80px 20px;
}

.error-code {
  font-size: 6rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 16px;
}

.error-message {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.error-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius);
  font-weight: 500;
  transition: opacity var(--transition);
}

.error-link:hover {
  opacity: 0.9;
  color: #fff;
}

/* ============================================================
   Syntax Highlighting (Rouge — GitHub Dark style)
   ============================================================ */
.highlight .hll { background-color: #2d333b; }
.highlight .c   { color: #8b949e; font-style: italic; }
.highlight .err { color: #f85149; }
.highlight .k   { color: #ff7b72; }
.highlight .o   { color: #c9d1d9; }
.highlight .cm  { color: #8b949e; font-style: italic; }
.highlight .cp  { color: #8b949e; font-style: italic; }
.highlight .c1  { color: #8b949e; font-style: italic; }
.highlight .cs  { color: #8b949e; font-style: italic; }
.highlight .gd  { color: #ffa198; background-color: rgba(248,81,73,0.1); }
.highlight .ge  { font-style: italic; }
.highlight .gi  { color: #56d364; background-color: rgba(63,185,80,0.1); }
.highlight .gs  { font-weight: bold; }
.highlight .kc  { color: #79c0ff; }
.highlight .kd  { color: #ff7b72; }
.highlight .kn  { color: #ff7b72; }
.highlight .kp  { color: #79c0ff; }
.highlight .kr  { color: #ff7b72; }
.highlight .kt  { color: #ffa657; }
.highlight .m   { color: #79c0ff; }
.highlight .s   { color: #a5d6ff; }
.highlight .na  { color: #79c0ff; }
.highlight .nb  { color: #c9d1d9; }
.highlight .nc  { color: #ffa657; }
.highlight .no  { color: #79c0ff; }
.highlight .nd  { color: #d2a8ff; }
.highlight .ni  { color: #c9d1d9; }
.highlight .ne  { color: #ffa657; }
.highlight .nf  { color: #d2a8ff; }
.highlight .nl  { color: #79c0ff; }
.highlight .nn  { color: #ffa657; }
.highlight .nt  { color: #7ee787; }
.highlight .nv  { color: #79c0ff; }
.highlight .ow  { color: #ff7b72; }
.highlight .w   { color: #c9d1d9; }
.highlight .mf  { color: #79c0ff; }
.highlight .mh  { color: #79c0ff; }
.highlight .mi  { color: #79c0ff; }
.highlight .mo  { color: #79c0ff; }
.highlight .sb  { color: #a5d6ff; }
.highlight .sc  { color: #a5d6ff; }
.highlight .sd  { color: #8b949e; }
.highlight .s2  { color: #a5d6ff; }
.highlight .se  { color: #79c0ff; }
.highlight .sh  { color: #a5d6ff; }
.highlight .si  { color: #a5d6ff; }
.highlight .sx  { color: #a5d6ff; }
.highlight .sr  { color: #7ee787; }
.highlight .s1  { color: #a5d6ff; }
.highlight .ss  { color: #79c0ff; }
.highlight .bp  { color: #c9d1d9; }
.highlight .vc  { color: #79c0ff; }
.highlight .vg  { color: #79c0ff; }
.highlight .vi  { color: #79c0ff; }
.highlight .il  { color: #79c0ff; }

/* Light theme syntax */
[data-theme="light"] .highlight .c   { color: #6a737d; }
[data-theme="light"] .highlight .k   { color: #d73a49; }
[data-theme="light"] .highlight .o   { color: #24292e; }
[data-theme="light"] .highlight .s   { color: #032f62; }
[data-theme="light"] .highlight .na  { color: #005cc5; }
[data-theme="light"] .highlight .nc  { color: #e36209; }
[data-theme="light"] .highlight .nf  { color: #6f42c1; }
[data-theme="light"] .highlight .nt  { color: #22863a; }
[data-theme="light"] .highlight .nv  { color: #005cc5; }
[data-theme="light"] .highlight .err { color: #cb2431; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .nav-hamburger {
    display: flex;
  }

  .hero-title {
    font-size: 1.8rem;
  }

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

  .post-card {
    padding: 18px;
  }

  .post-card-title {
    font-size: 1.15rem;
  }

  .post-title-full {
    font-size: 1.7rem;
  }

  .page-title {
    font-size: 1.6rem;
  }

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

  .footer-content {
    flex-direction: column;
    gap: 12px;
  }

  .main-content {
    padding: calc(var(--nav-height) + 24px) 16px 40px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.5rem;
  }

  .post-card-title {
    font-size: 1.05rem;
  }

  .post-title-full {
    font-size: 1.4rem;
  }

  .post-content pre {
    padding: 14px;
    font-size: 0.8rem;
  }

  .error-code {
    font-size: 4rem;
  }
}

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

/* Lazy loading placeholder */
img[loading="lazy"] {
  opacity: 0;
  transition: opacity 0.3s ease;
}

img[loading="lazy"].loaded,
img.loaded {
  opacity: 1;
}