/* ==========================================================================
   Base Styles - Video Summary Blog
   ========================================================================== */

/* CSS Variables */
:root {
  /* Colors */
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #3b82f6;
  --color-accent: #f59e0b;
  --color-secondary: #0891b2;
  
  /* Neutrals */
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-bg-elevated: #ffffff;
  --color-surface: #f1f5f9;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  
  /* Text */
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;
  --color-text-inverse: #ffffff;
  
  /* Semantic */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  
  /* Typography */
  --font-sans: 'Noto Sans Thai', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'Noto Serif Thai', Georgia, 'Times New Roman', serif;
  --font-display: 'Noto Sans Thai', sans-serif;
  --font-mono: 'Fira Code', 'Consolas', monospace;
  
  /* Font Sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  
  /* Layout */
  --container-max: 1280px;
  --container-content: 720px;
  --sidebar-width: 320px;
  --header-height: 72px;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
}

/* Dark Mode Variables */
[data-theme="dark"], .dark {
  --color-bg: #0f172a;
  --color-bg-alt: #1e293b;
  --color-bg-elevated: #1e293b;
  --color-surface: #334155;
  --color-border: #334155;
  --color-border-light: #1e293b;
  --color-text: #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
}

/* 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: var(--text-base);
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text);
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-base); }

p {
  margin-bottom: var(--space-4);
}

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

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

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

/* Reading Progress Bar */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  z-index: 9999;
  transition: width 50ms ease-out;
}

/* ==========================================================================
   Header
   ========================================================================== */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(8px);
  background-color: rgba(255, 255, 255, 0.95);
}

.dark .header {
  background-color: rgba(15, 23, 42, 0.95);
}

.header__container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-xl);
  color: var(--color-text);
}

.header__logo:hover {
  color: var(--color-primary);
}

.header__logo-img {
  height: 40px;
  width: auto;
}

.header__nav {
  display: flex;
  align-items: center;
}

.header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
}

.header__nav-item {
  position: relative;
}

.header__nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.header__nav-link:hover,
.header__nav-link.is-active {
  color: var(--color-text);
  background-color: var(--color-surface);
}

.header__dropdown-icon {
  transition: transform var(--transition-fast);
}

.header__nav-item--dropdown:hover .header__dropdown-icon {
  transform: rotate(180deg);
}

/* Dropdown */
.header__dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  padding: var(--space-2);
  background-color: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--transition-fast);
  list-style: none;
}

.header__nav-item--dropdown:hover .header__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.header__dropdown-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.header__dropdown-link:hover {
  color: var(--color-text);
  background-color: var(--color-surface);
}

.header__dropdown-count {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.header__dropdown-more .header__dropdown-link {
  color: var(--color-primary);
  font-weight: 500;
}

/* Header Actions */
.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.header__search-btn,
.header__theme-btn,
.header__menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--color-text-secondary);
  background: none;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.header__search-btn:hover,
.header__theme-btn:hover,
.header__menu-btn:hover {
  color: var(--color-text);
  background-color: var(--color-surface);
}

.header__theme-icon--dark {
  display: none;
}

.dark .header__theme-icon--light {
  display: none;
}

.dark .header__theme-icon--dark {
  display: block;
}

/* Mobile Menu Button */
.header__menu-btn {
  display: none;
}

.header__menu-icon {
  position: relative;
  width: 18px;
  height: 2px;
  background-color: currentColor;
  transition: background-color var(--transition-fast);
}

.header__menu-icon::before,
.header__menu-icon::after {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: currentColor;
  transition: transform var(--transition-fast);
}

.header__menu-icon::before {
  top: -6px;
}

.header__menu-icon::after {
  bottom: -6px;
}

/* Search Overlay */
.search-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 20vh;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.search-overlay.is-active {
  opacity: 1;
  visibility: visible;
}

.search-overlay__container {
  position: relative;
  width: 100%;
  max-width: 600px;
  margin: 0 var(--space-4);
}

.search-overlay__form {
  display: flex;
  background-color: var(--color-bg);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
}

.search-overlay__input {
  flex: 1;
  padding: var(--space-5) var(--space-6);
  font-size: var(--text-lg);
  font-family: inherit;
  color: var(--color-text);
  background: none;
  border: none;
  outline: none;
}

.search-overlay__input::placeholder {
  color: var(--color-text-muted);
}

.search-overlay__submit {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  color: var(--color-text-secondary);
  background: none;
  border: none;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.search-overlay__submit:hover {
  color: var(--color-primary);
}

.search-overlay__close {
  position: absolute;
  top: -50px;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: white;
  background: none;
  border: none;
  cursor: pointer;
  opacity: 0.7;
  transition: opacity var(--transition-fast);
}

.search-overlay__close:hover {
  opacity: 1;
}

/* ==========================================================================
   Main Content
   ========================================================================== */
.main-content {
  min-height: calc(100vh - var(--header-height) - 200px);
}

/* Page Container */
.page__container {
  display: grid;
  grid-template-columns: 1fr var(--sidebar-width);
  gap: var(--space-12);
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-12) var(--space-6);
}

.page__container--wide {
  display: block;
  max-width: var(--container-max);
  padding: var(--space-8) var(--space-6) var(--space-16);
}

.page__main {
  min-width: 0;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  position: relative;
  padding: var(--space-16) var(--space-6);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  overflow: hidden;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: var(--container-content);
  margin: 0 auto;
  text-align: center;
}

.hero__title {
  font-size: var(--text-5xl);
  font-weight: 700;
  color: white;
  margin-bottom: var(--space-4);
}

.hero__subtitle {
  font-size: var(--text-xl);
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--space-8);
}

.hero__search {
  display: flex;
  max-width: 500px;
  margin: 0 auto;
  background-color: white;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.hero__search-input {
  flex: 1;
  padding: var(--space-4) var(--space-6);
  font-size: var(--text-base);
  font-family: inherit;
  border: none;
  outline: none;
}

.hero__search-btn {
  padding: var(--space-4) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 600;
  color: white;
  background-color: var(--color-primary);
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

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

.hero__decoration {
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
}

/* ==========================================================================
   Categories Bar
   ========================================================================== */
.categories-bar {
  background-color: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}

.categories-bar__container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
  overflow: hidden;
}

.categories-bar__list {
  display: flex;
  gap: var(--space-2);
  padding: var(--space-4) 0;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  -ms-overflow-style: none;
  -webkit-overflow-scrolling: touch;
}

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

.categories-bar__item {
  flex-shrink: 0;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  background-color: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.categories-bar__item:hover,
.categories-bar__item.is-active {
  color: white;
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

/* ==========================================================================
   Posts Grid
   ========================================================================== */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-8);
}

/* Post Card */
.post-card {
  position: relative;
  background-color: var(--color-bg-elevated);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

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

.post-card__link {
  display: block;
  color: inherit;
}

.post-card__image {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background-color: var(--color-surface);
}

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

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

.post-card__category {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  color: white;
  background-color: var(--color-primary);
  border-radius: var(--radius-full);
}

.post-card__content {
  padding: var(--space-5);
}

.post-card__title {
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: var(--space-2);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-card__excerpt {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.post-card__date,
.post-card__read-time {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

/* Featured Post Card */
.post-card--featured {
  grid-column: span 2;
}

.post-card--featured .post-card__link {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.post-card--featured .post-card__image {
  aspect-ratio: auto;
  height: 100%;
}

.post-card--featured .post-card__content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--space-8);
}

.post-card--featured .post-card__title {
  font-size: var(--text-2xl);
  -webkit-line-clamp: 3;
}

.post-card--featured .post-card__excerpt {
  -webkit-line-clamp: 3;
}

/* Horizontal Post Card */
.post-card--horizontal {
  border-radius: var(--radius-lg);
}

.post-card--horizontal .post-card__link {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--space-4);
}

.post-card--horizontal .post-card__image {
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-lg);
}

.post-card--horizontal .post-card__content {
  padding: var(--space-4) var(--space-4) var(--space-4) 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.post-card__category-label {
  display: inline-block;
  margin-bottom: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Small Post Card */
.post-card--small .post-card__title {
  font-size: var(--text-base);
  -webkit-line-clamp: 2;
}

.post-card--small .post-card__content {
  padding: var(--space-4);
}

/* ==========================================================================
   Sidebar
   ========================================================================== */
.sidebar {
  position: sticky;
  top: calc(var(--header-height) + var(--space-8));
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  height: fit-content;
}

.sidebar__widget {
  padding: var(--space-6);
  background-color: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
}

.sidebar__widget-title {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--color-primary);
}

/* Sidebar Search */
.sidebar__search-form {
  display: flex;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.sidebar__search-input {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-family: inherit;
  color: var(--color-text);
  background: none;
  border: none;
  outline: none;
}

.sidebar__search-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  color: var(--color-text-secondary);
  background: none;
  border: none;
  cursor: pointer;
  transition: color var(--transition-fast);
}

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

/* Sidebar Categories */
.sidebar__category-list {
  list-style: none;
}

.sidebar__category-item {
  border-bottom: 1px solid var(--color-border-light);
}

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

.sidebar__category-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) 0;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.sidebar__category-link:hover,
.sidebar__category-link.is-active {
  color: var(--color-primary);
}

.sidebar__category-count {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  background-color: var(--color-surface);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
}

/* Sidebar About */
.sidebar__about-text {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
}

.sidebar__about-link {
  font-size: var(--text-sm);
  font-weight: 500;
}

/* ==========================================================================
   Article Page
   ========================================================================== */
.article__breadcrumb {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.article__breadcrumb-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-3) var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  overflow-x: auto;
  white-space: nowrap;
}

.article__breadcrumb-container a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.article__breadcrumb-container a:hover {
  color: var(--color-primary);
}

.article__breadcrumb-container span {
  color: var(--color-text-muted);
}

.article__breadcrumb-current {
  color: var(--color-text);
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 300px;
}

.article__header {
  padding: var(--space-12) var(--space-6);
  background-color: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}

.article__header-container {
  max-width: var(--container-content);
  margin: 0 auto;
}

.article__category {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  margin-bottom: var(--space-4);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  background-color: rgba(37, 99, 235, 0.1);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.article__title {
  font-size: var(--text-4xl);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-4);
}

.article__excerpt {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

.article__meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-6);
}

.article__author {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.article__author-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  object-fit: cover;
}

.article__author-name {
  font-weight: 500;
}

.article__details {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.article__date,
.article__read-time {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Video Embed */
.article__video {
  max-width: var(--container-content);
  margin: 0 auto;
  padding: var(--space-8) var(--space-6);
}

.article__video-container {
  position: relative;
  /*padding-bottom: 56.25%;*/
  border-radius: var(--radius-xl);
  overflow: hidden;
  background-color: var(--color-surface);
}

.article__video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.article__video-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-primary);
}

/* Featured Image */
.article__featured-image {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-8) var(--space-6);
}

.article__featured-image img {
  width: 100%;
  border-radius: var(--radius-xl);
}

/* Article Body */
.article__body-wrapper {
  display: grid;
  grid-template-columns: 1fr var(--sidebar-width);
  gap: var(--space-10);
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-8) var(--space-6);
}

.article__body-wrapper--with-toc {
  grid-template-columns: 200px 1fr 280px;
}

.article__body-wrapper--single {
  display: block;
  max-width: var(--container-content);
}

/* Table of Contents */
.article__toc {
  position: sticky;
  top: calc(var(--header-height) + var(--space-8));
  height: fit-content;
}

.article__toc-title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
}

.article__toc-list {
  list-style: none;
}

.article__toc-item {
  margin-bottom: var(--space-2);
}

.article__toc-item--sub {
  padding-left: var(--space-4);
}

.article__toc-link {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.article__toc-link:hover {
  color: var(--color-primary);
}

/* Article Content */
.article__content {
  min-width: 0;
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  line-height: 1.8;
}

.article__content h2 {
  font-family: var(--font-display);
  margin-top: var(--space-10);
  margin-bottom: var(--space-4);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

.article__content h3 {
  font-family: var(--font-display);
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
}

.article__content h4,
.article__content h5,
.article__content h6 {
  font-family: var(--font-display);
}

.article__content p {
  margin-bottom: var(--space-6);
}

.article__content ul,
.article__content ol {
  margin-bottom: var(--space-6);
  padding-left: var(--space-6);
}

.article__content li {
  margin-bottom: var(--space-2);
}

.article__content blockquote {
  margin: var(--space-8) 0;
  padding: var(--space-6);
  background-color: var(--color-bg-alt);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
}

.article__content code {
  padding: var(--space-1) var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.9em;
  background-color: var(--color-surface);
  border-radius: var(--radius-sm);
}

.article__content pre {
  margin: var(--space-6) 0;
  padding: var(--space-5);
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow-x: auto;
}

.article__content pre code {
  padding: 0;
  background: none;
}

.article__content img {
  margin: var(--space-8) 0;
  border-radius: var(--radius-lg);
}

.article__content a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* Article Sidebar */
.article__sidebar {
  position: sticky;
  top: calc(var(--header-height) + var(--space-8));
  height: fit-content;
}

/* Tags */
.article__tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  max-width: var(--container-content);
  margin: var(--space-8) auto;
  padding: 0 var(--space-6);
}

.article__tag {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  background-color: var(--color-surface);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.article__tag:hover {
  color: var(--color-primary);
  background-color: rgba(37, 99, 235, 0.1);
}

/* Share */
.article__share {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  max-width: var(--container-content);
  margin: var(--space-8) auto;
  padding: var(--space-6);
  background-color: var(--color-bg-alt);
  border-radius: var(--radius-lg);
}

.article__share-label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
}

.article__share-buttons {
  display: flex;
  gap: var(--space-2);
}

.article__share-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: white;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.article__share-btn:hover {
  transform: scale(1.1);
}

.article__share-btn--facebook {
  background-color: #1877f2;
}

.article__share-btn--twitter {
  background-color: #000000;
}

.article__share-btn--copy {
  color: var(--color-text-secondary);
  background-color: var(--color-surface);
}

/* Article Navigation */
.article__nav {
  max-width: var(--container-content);
  margin: var(--space-12) auto;
  padding: 0 var(--space-6);
}

.article__nav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 500;
}

/* Related Posts */
.related-posts {
  background-color: var(--color-bg-alt);
  padding: var(--space-12) 0;
}

.related-posts__container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.related-posts__title {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-8);
}

.related-posts__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--space-6);
}

/* ==========================================================================
   Category & Search Pages
   ========================================================================== */
.category-header,
.search-header,
.page-header {
  padding: var(--space-12) var(--space-6);
  background-color: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}

.category-header__container,
.search-header__container,
.page-header__container {
  max-width: var(--container-max);
  margin: 0 auto;
}

.page-header--centered .page-header__container {
  text-align: center;
}

.category-header__breadcrumb,
.page-header__breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.category-header__breadcrumb a,
.page-header__breadcrumb a {
  color: var(--color-text-secondary);
}

.category-header__title,
.search-header__title,
.page-header__title {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-3);
}

.category-header__description,
.page-header__description {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
}

.category-header__count {
  display: inline-block;
  margin-top: var(--space-4);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-primary);
  background-color: rgba(37, 99, 235, 0.1);
  border-radius: var(--radius-full);
}

/* Search Form */
.search-header__form {
  margin-top: var(--space-6);
}

.search-header__input-wrapper {
  display: flex;
  align-items: center;
  max-width: 600px;
  background-color: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.search-header__input-wrapper:focus-within {
  border-color: var(--color-primary);
}

.search-header__icon {
  margin-left: var(--space-5);
  color: var(--color-text-muted);
}

.search-header__input {
  flex: 1;
  padding: var(--space-4) var(--space-4);
  font-size: var(--text-lg);
  font-family: inherit;
  color: var(--color-text);
  background: none;
  border: none;
  outline: none;
}

.search-header__submit {
  padding: var(--space-4) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 600;
  font-family: inherit;
  color: white;
  background-color: var(--color-primary);
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.search-header__submit:hover {
  background-color: var(--color-primary-dark);
}

.search-results__count {
  margin-bottom: var(--space-6);
  color: var(--color-text-secondary);
}

/* Posts List */
.posts-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

/* Search Suggestions */
.search-suggestions {
  padding: var(--space-8);
  background-color: var(--color-bg-alt);
  border-radius: var(--radius-xl);
  text-align: center;
}

.search-suggestions__title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-6);
}

.search-suggestions__categories {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2);
}

.search-suggestions__tag {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.search-suggestions__tag:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

/* ==========================================================================
   Categories Grid
   ========================================================================== */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
}

.category-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: var(--space-8);
  background-color: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  transition: all var(--transition-base);
}

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

.category-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.category-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  color: var(--color-primary);
  background-color: rgba(37, 99, 235, 0.1);
  border-radius: var(--radius-md);
}

.category-card__emoji {
  font-size: 1.25rem;
  line-height: 1;
}

.category-card__name {
  font-size: var(--text-lg);
  margin: 0;
  color: var(--color-text);
}

.category-card__description {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
  flex: 1;
}

.category-card__count {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.category-card__arrow {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  color: var(--color-text-muted);
  opacity: 0;
  transform: translateX(-8px);
  transition: all var(--transition-fast);
}

.category-card:hover .category-card__arrow {
  opacity: 1;
  transform: translateX(0);
  color: var(--color-primary);
}

/* ==========================================================================
   About Page
   ========================================================================== */
.about-content {
  padding: var(--space-16) 0;
}

.about-content__container {
  max-width: var(--container-content);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.about-section {
  margin-bottom: var(--space-12);
}

.about-section__title {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-4);
}

.about-section__text {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.about-section--disclaimer {
  padding: var(--space-6);
  background-color: var(--color-bg-alt);
  border-radius: var(--radius-lg);
}

.about-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-8);
  margin-top: var(--space-8);
}

.about-feature {
  text-align: center;
}

.about-feature__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-4);
  color: var(--color-primary);
  background-color: rgba(37, 99, 235, 0.1);
  border-radius: var(--radius-xl);
}

.about-feature__title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
}

.about-feature__text {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.about-social {
  display: flex;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.about-social__link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-weight: 500;
  color: white;
  background-color: #ff0000;
  border-radius: var(--radius-md);
  transition: opacity var(--transition-fast);
}

.about-social__link:hover {
  opacity: 0.9;
  color: white;
}

/* ==========================================================================
   Error Pages
   ========================================================================== */
.page--error {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--header-height) - 200px);
  padding: var(--space-12) var(--space-6);
}

.error-content {
  text-align: center;
  max-width: 500px;
}

.error-content__icon {
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

.error-content__icon--warning {
  color: var(--color-warning);
}

.error-content__code {
  font-family: var(--font-display);
  font-size: 8rem;
  font-weight: 700;
  line-height: 1;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.error-content__title {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-4);
}

.error-content__text {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-8);
}

.error-content__actions {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
}

.error-content__btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 600;
  font-family: inherit;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.error-content__btn--primary {
  color: white;
  background-color: var(--color-primary);
  border: none;
}

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

.error-content__btn--secondary {
  color: var(--color-text-secondary);
  background-color: var(--color-surface);
  border: none;
}

.error-content__btn--secondary:hover {
  background-color: var(--color-border);
  color: var(--color-text);
}

/* ==========================================================================
   Empty State
   ========================================================================== */
.empty-state {
  text-align: center;
  padding: var(--space-16) var(--space-6);
}

.empty-state__icon {
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

.empty-state__title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-2);
}

.empty-state__text {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

.empty-state__link {
  font-weight: 500;
}

/* ==========================================================================
   Alerts
   ========================================================================== */
.alert {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-6);
}

.alert--error {
  color: #991b1b;
  background-color: #fef2f2;
  border: 1px solid #fecaca;
}

.alert--success {
  color: #166534;
  background-color: #f0fdf4;
  border: 1px solid #bbf7d0;
}

/* ==========================================================================
   Pagination
   ========================================================================== */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  margin-top: var(--space-12);
}

.pagination__link {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  background-color: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.pagination__link:hover:not(.pagination__link--disabled) {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.pagination__link--disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.pagination__numbers {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.pagination__number {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.pagination__number:hover {
  color: var(--color-primary);
  background-color: var(--color-surface);
}

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

.pagination__ellipsis {
  padding: 0 var(--space-2);
  color: var(--color-text-muted);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  background-color: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

.footer__container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.footer__top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-12);
  padding: var(--space-12) 0;
}

.footer__logo {
  display: inline-block;
  margin-bottom: var(--space-4);
}

.footer__logo-img {
  height: 32px;
  width: auto;
}

.footer__logo-text {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
}

.footer__tagline {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

.footer__social {
  display: flex;
  gap: var(--space-3);
}

.footer__social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--color-text-secondary);
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.footer__social-link:hover {
  color: var(--color-primary);
  background-color: var(--color-border);
}

.footer__links-title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
}

.footer__links-list {
  list-style: none;
}

.footer__links-list li {
  margin-bottom: var(--space-2);
}

.footer__links-list a {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.footer__links-list a:hover {
  color: var(--color-primary);
}

.footer__bottom {
  padding: var(--space-6) 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer__disclaimer {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

.footer__copyright {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1024px) {
  .page__container {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    order: 2;
  }

  .article__body-wrapper,
  .article__body-wrapper--with-toc {
    grid-template-columns: 1fr;
  }

  .article__toc {
    display: none;
  }

  .article__sidebar {
    position: static;
    margin-top: var(--space-8);
  }

  .article__content {
    max-width: 100%;
  }

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

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .hero__title {
    font-size: var(--text-3xl);
  }

  .hero__subtitle {
    font-size: var(--text-base);
  }

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

  .post-card--featured {
    grid-column: span 1;
  }

  .post-card--featured .post-card__link {
    grid-template-columns: 1fr;
  }

  .post-card--featured .post-card__image {
    aspect-ratio: 16 / 9;
  }

  .post-card--horizontal .post-card__link {
    grid-template-columns: 1fr;
  }

  .post-card--horizontal .post-card__image {
    aspect-ratio: 16 / 9;
  }

  .article__title {
    font-size: var(--text-2xl);
  }

  .footer__top {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .header__nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-4);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  }

  .header__nav.is-active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .header__nav-list {
    flex-direction: column;
    align-items: stretch;
  }

  .header__nav-link {
    padding: var(--space-3) var(--space-4);
    justify-content: space-between;
  }

  .header__dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    padding-left: var(--space-4);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .header__nav-item--dropdown.is-open .header__dropdown {
    max-height: 500px;
  }

  .header__menu-btn {
    display: flex;
  }

  .header__menu-btn.is-active .header__menu-icon {
    background-color: transparent;
  }

  .header__menu-btn.is-active .header__menu-icon::before {
    transform: rotate(45deg) translate(4px, 4px);
  }

  .header__menu-btn.is-active .header__menu-icon::after {
    transform: rotate(-45deg) translate(4px, -4px);
  }

  .error-content__code {
    font-size: 5rem;
  }

  .error-content__actions {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: var(--space-10) var(--space-4);
  }

  .hero__search {
    flex-direction: column;
    border-radius: var(--radius-lg);
  }

  .hero__search-input {
    border-bottom: 1px solid var(--color-border);
  }

  .hero__search-btn {
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  }

  .page__container {
    padding: var(--space-8) var(--space-4);
  }

  .pagination {
    flex-wrap: wrap;
  }

  .pagination__link span {
    display: none;
  }
}

/* ==========================================================================
   Video Chapters
   ========================================================================== */
.article__chapters {
  max-width: var(--container-content);
  margin: 0 auto var(--space-8);
  padding: var(--space-6);
  background: linear-gradient(135deg, var(--color-bg-alt) 0%, var(--color-surface) 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
}

.article__chapters-title {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--color-primary);
}

.article__chapters-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-2);
  max-height: 400px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
}

.article__chapters-list::-webkit-scrollbar {
  width: 6px;
}

.article__chapters-list::-webkit-scrollbar-track {
  background: transparent;
}

.article__chapters-list::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}

.article__chapter-item {
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.article__chapter-item:hover {
  background-color: var(--color-bg);
}

.article__chapter-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  color: var(--color-text);
  text-decoration: none;
}

.article__chapter-time {
  flex-shrink: 0;
  padding: var(--space-1) var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  background-color: rgba(37, 99, 235, 0.1);
  border-radius: var(--radius-sm);
}

.article__chapter-title {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.article__chapter-link:hover .article__chapter-title {
  color: var(--color-primary);
}

/* ==========================================================================
   Article Highlights / Key Points
   ========================================================================== */
.article__highlights {
  position: relative;
  margin-bottom: var(--space-8);
  padding: var(--space-6);
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.05) 0%, rgba(8, 145, 178, 0.05) 100%);
  border: 1px solid rgba(37, 99, 235, 0.2);
  border-radius: var(--radius-xl);
  border-left: 4px solid var(--color-primary);
}

.article__highlights::before {
  content: '';
  position: absolute;
  top: -1px;
  left: -1px;
  right: -1px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.article__highlights h3 {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.article__highlights h3::before {
  content: '✨';
  font-size: var(--text-xl);
}

.article__highlights ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.article__highlights li {
  position: relative;
  padding: var(--space-3) 0 var(--space-3) var(--space-4);
  font-size: var(--text-base);
  line-height: 1.8;
  color: var(--color-text);
  border-bottom: 1px solid rgba(37, 99, 235, 0.1);
}

.article__highlights li:last-child {
  border-bottom: none;
}

.article__highlights li::before {
  content: '';
  position: absolute;
  left: 0;
  top: calc(var(--space-3) + 0.5em);
  width: 8px;
  height: 8px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-full);
}

/* ==========================================================================
   Article Outro / CTA Section
   ========================================================================== */
.article__outro {
  margin-top: var(--space-10);
  padding: var(--space-8);
  background: linear-gradient(135deg, var(--color-bg-alt) 0%, var(--color-surface) 100%);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  text-align: center;
}

.article__advice {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-4);
  font-style: italic;
}

.article__cta {
  font-size: var(--text-lg);
  color: var(--color-primary);
  margin: 0;
}

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

/* ==========================================================================
   Channel Badge in Article
   ========================================================================== */
.article__channel {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
  color: #ff0000;
  background-color: rgba(255, 0, 0, 0.1);
  border-radius: var(--radius-full);
}

/* ==========================================================================
   Enhanced Post Cards
   ========================================================================== */
.post-card {
  border: 1px solid var(--color-border);
}

.post-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  opacity: 0;
  transition: opacity var(--transition-base);
}

.post-card:hover::before {
  opacity: 1;
}

/* Play button overlay for video posts */
.post-card__image::after {
  content: '';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.3);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.post-card:hover .post-card__image::after {
  opacity: 1;
}

.post-card__play-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.95);
  border-radius: var(--radius-full);
  color: var(--color-primary);
  box-shadow: var(--shadow-lg);
  z-index: 2;
  opacity: 0;
  transition: all var(--transition-base);
}

.post-card:hover .post-card__play-icon {
  opacity: 1;
}

/* ==========================================================================
   Enhanced Hero Section
   ========================================================================== */
.hero {
  background: linear-gradient(135deg, #1e3a8a 0%, #0891b2 50%, #059669 100%);
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.5;
}

/* ==========================================================================
   Smooth Animations
   ========================================================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

.post-card {
  animation: fadeInUp 0.5s ease forwards;
}

.posts-grid .post-card:nth-child(1) { animation-delay: 0s; }
.posts-grid .post-card:nth-child(2) { animation-delay: 0.1s; }
.posts-grid .post-card:nth-child(3) { animation-delay: 0.2s; }
.posts-grid .post-card:nth-child(4) { animation-delay: 0.3s; }
.posts-grid .post-card:nth-child(5) { animation-delay: 0.4s; }
.posts-grid .post-card:nth-child(6) { animation-delay: 0.5s; }

/* Loading skeleton animation */
.skeleton {
  background: linear-gradient(90deg, var(--color-surface) 25%, var(--color-border) 50%, var(--color-surface) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
}

@keyframes skeleton-loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* ==========================================================================
   Better Typography for Content
   ========================================================================== */
.article__content h2 {
  position: relative;
  padding-left: var(--space-4);
}

.article__content h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 60%;
  background: linear-gradient(180deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-full);
}

.article__content h3 {
  color: var(--color-primary-dark);
}

.article__content h4 {
  color: var(--color-secondary);
}

/* Better list styling */
.article__content ul li::marker {
  color: var(--color-primary);
}

.article__content ol li::marker {
  color: var(--color-primary);
  font-weight: 600;
}

/* ==========================================================================
   Copy button feedback
   ========================================================================== */
.article__share-btn--copy.copied {
  background-color: var(--color-success);
  color: white;
}

.article__share-btn--copy.copied::after {
  content: '✓';
  position: absolute;
  font-size: var(--text-sm);
}

/* ==========================================================================
   Mobile Responsive Updates
   ========================================================================== */
@media (max-width: 768px) {
  .article__chapters-list {
    grid-template-columns: 1fr;
    max-height: 300px;
  }

  .article__highlights {
    padding: var(--space-4);
  }

  .article__outro {
    padding: var(--space-5);
  }
}