/* ========================================
   Blog Thiago Henrique - Main Stylesheet
   ======================================== */

/* ========================================
   1. CSS Variables (Design Tokens)
   ======================================== */
:root {
  /* Colors */
  --primary: #2A5298;
  --primary-dark: #1a365d;
  --primary-light: #4a7bc8;
  --accent: #667eea;
  --accent-alt: #f5576c;
  
  --white: #ffffff;
  --gray-50: #f7fafc;
  --gray-100: #edf2f7;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e0;
  --gray-400: #a0aec0;
  --gray-600: #718096;
  --gray-700: #4a5568;
  --gray-800: #2d3748;
  --gray-900: #1a202c;
  
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-serif: Georgia, 'Times New Roman', serif;
  
  --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;
  
  --font-normal: 300;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 2.5rem;
  --spacing-3xl: 3rem;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Layout */
  --container-max-width: 1200px;
  --sidebar-width: 320px;
  --content-gap: 2.5rem;
}

/* ========================================
   2. CSS Reset
   ======================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* ========================================
   3. Base Styles
   ======================================== */
body {
  font-family: var(--font-sans);
  line-height: 1.7;
  color: var(--gray-800);
  background: linear-gradient(to bottom, var(--gray-50) 0%, var(--gray-100) 100%);
  min-height: 100vh;
}

/* ========================================
   4. Layout
   ======================================== */

/* Container */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Main Content Grid */
.main-content {
  display: grid;
  grid-template-columns: 1fr var(--sidebar-width);
  gap: var(--content-gap);
  margin-bottom: var(--spacing-3xl);
}

/* Responsive: Stack on mobile */
@media (max-width: 968px) {
  .main-content {
    grid-template-columns: 1fr;
  }
  
  .sidebar {
    position: static !important;
    top: auto !important;
  }
}

/* ========================================
   5. Header
   ======================================== */
header {
  background: linear-gradient(135deg, rgba(26, 54, 93, 0.85) 0%, rgba(42, 82, 152, 0.85) 100%);
  background-size: cover;
  background-position: center 43%;
  background-repeat: no-repeat;
  color: var(--white);
  padding: var(--spacing-3xl) 0 var(--spacing-2xl) 0;
  margin-bottom: 0;
  box-shadow: var(--shadow-md);
  transition: background-image var(--transition-slow);
  position: relative;
}

/* Header with background image loaded */
header.loaded {
  background-image: linear-gradient(135deg, rgba(26, 54, 93, 0.85) 0%, rgba(42, 82, 152, 0.85) 100%), 
                    url('https://blogthiago.s3.amazonaws.com/media/imagem/cityscape.jpg');
}

header .container {
  position: relative;
}

/* Header Content */
.header-content {
  text-align: center;
}

/* Site Title */
.site-title a {
  color: var(--white);
  text-decoration: none;
  transition: opacity var(--transition-base);
  display: inline-block;
}

.site-title a:hover {
  opacity: 0.9;
}

.site-name {
  font-size: var(--text-4xl);
  font-weight: var(--font-bold);
  letter-spacing: -0.5px;
  display: block;
}

/* Site Description */
.site-description {
  font-size: var(--text-lg);
  opacity: 0.95;
  font-weight: var(--font-normal);
  margin-top: var(--spacing-sm);
}

/* Header Actions (RSS/Atom icons) */
.header-actions {
  position: absolute;
  top: 0;
  right: 0;
  display: flex;
  gap: var(--spacing-sm);
}

.header-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  color: var(--white);
  text-decoration: none;
  transition: all var(--transition-base);
  backdrop-filter: blur(10px);
  font-size: var(--text-lg);
}

.header-icon:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

/* Legacy support */
header h1 {
  font-size: var(--text-4xl);
  margin-bottom: var(--spacing-sm);
  font-weight: var(--font-bold);
  letter-spacing: -0.5px;
}

.blog-icon {
  width: 60px;
  height: 60px;
  object-fit: contain;
}

/* ========================================
   6. Search Bar
   ======================================== */
.search-bar {
  background: var(--white);
  border-bottom: 2px solid var(--gray-200);
  padding: var(--spacing-lg) 0;
  margin-bottom: var(--spacing-3xl);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.search-bar.scrolled {
  box-shadow: var(--shadow-md);
  padding: var(--spacing-md) 0;
}

.search-bar__wrapper {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  max-width: 800px;
  margin: 0 auto;
}

.home-button {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--primary);
  color: var(--white);
  border-radius: var(--radius-md);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  transition: var(--transition-base);
  white-space: nowrap;
  flex-shrink: 0;
}

.home-button svg {
  width: 20px;
  height: 20px;
}

.home-button:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.search-form {
  display: flex;
  width: 100%;
  flex: 1;
  position: relative;
}

.search-input {
  flex: 1;
  padding: var(--spacing-md) var(--spacing-xl);
  padding-right: 50px;
  border: 2px solid var(--gray-300);
  border-radius: var(--radius-full);
  font-size: var(--text-base);
  transition: all var(--transition-base);
  background: var(--gray-50);
  font-family: inherit;
}

.search-input:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--white);
  box-shadow: 0 0 0 4px rgba(42, 82, 152, 0.1);
}

.search-input:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

.search-button {
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--primary);
  color: var(--white);
  border: none;
  border-radius: var(--radius-full);
  width: 40px;
  height: 40px;
  cursor: pointer;
  font-size: var(--text-lg);
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-button:hover:not(:disabled) {
  background: var(--primary-dark);
  transform: translateY(-50%) scale(1.05);
}

.search-button:hover {
  background: var(--primary-dark);
  transform: translateY(-50%) scale(1.05);
}

.search-button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
  background: var(--gray-400);
}

/* Mobile Search Bar */
@media (max-width: 768px) {
  .search-bar__wrapper {
    gap: var(--spacing-sm);
  }
  
  .home-button span {
    display: none;
  }
  
  .home-button {
    padding: var(--spacing-sm);
  }
  
  .search-bar {
    padding: var(--spacing-md) 0;
  }
  
  .search-form {
    max-width: 100%;
  }
  
  .search-input {
    font-size: var(--text-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    padding-right: 45px;
  }
  
  .search-button {
    width: 36px;
    height: 36px;
    font-size: var(--text-base);
  }
}

/* ========================================
   7. Post Card Component
   ======================================== */
.post {
  background: var(--white);
  padding: var(--spacing-2xl);
  margin-bottom: var(--spacing-3xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  border: 1px solid var(--gray-200);
  position: relative;
}

/* Visual separator between posts */
.post::after {
  content: '';
  position: absolute;
  bottom: calc(-1 * var(--spacing-lg));
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  max-width: 400px;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--gray-300) 50%, transparent 100%);
}

.post:last-of-type::after {
  display: none;
}

/* Accent border on hover */
.post::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--primary) 0%, var(--primary-light) 100%);
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
  opacity: 0;
  transition: opacity var(--transition-base);
  z-index: 1;
}

.post:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--primary-light);
  background: linear-gradient(135deg, var(--white) 0%, #fafbfd 100%);
}

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

/* Post Title */
.post h1,
.post h2 {
  color: var(--gray-900);
  margin-bottom: var(--spacing-md);
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  line-height: 1.3;
}

.post h1 a,
.post h2 a {
  color: var(--gray-900);
  text-decoration: none;
  transition: color var(--transition-base);
}

.post h2 a:hover {
  color: var(--accent);
}

/* Post Meta */
.post-meta {
  color: var(--gray-600);
  font-size: var(--text-sm);
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--gray-200);
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.post-meta span {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

/* Post Image */
.post-image {
  max-width: 100%;
  height: auto;
  margin: var(--spacing-lg) 0;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

/* ========================================
   7.1 Section Header
   ======================================== */
.section-header {
  margin-bottom: var(--spacing-3xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 3px solid var(--primary);
  position: relative;
}

.section-header::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 120px;
  height: 3px;
  background: var(--primary-light);
}

.section-title {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--gray-900);
  margin: 0 0 var(--spacing-sm) 0;
  line-height: 1.2;
}

.section-description {
  font-size: var(--text-base);
  color: var(--gray-600);
  margin: 0;
  line-height: 1.5;
}

/* ========================================
   7.2 Enhanced Post Card Layout
   ======================================== */
.post-card {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  overflow: hidden;
}

/* Post Card Image */
.post-card__image {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--gray-200);
  width: 100%;
  aspect-ratio: 16 / 9;
}

.post-card__image a {
  display: block;
  height: 100%;
}

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

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

/* Post Card Content */
.post-card__content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  padding: var(--spacing-sm) 0;
}

/* Tag Badges */
.post-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-xs);
}

.tag-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--gray-100);
  color: var(--primary-dark);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: all var(--transition-base);
  border: 1px solid var(--gray-300);
}

.tag-badge:hover {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
  transform: translateY(-1px);
}

.tag-badge--more {
  background: var(--gray-200);
  color: var(--gray-600);
  cursor: default;
  font-size: 0.65rem;
}

.tag-badge--more:hover {
  background: var(--gray-200);
  color: var(--gray-600);
  transform: none;
}

/* Post Card Title */
.post-card__title {
  margin: 0;
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  line-height: 1.3;
}

.post-card__title a {
  color: var(--gray-900);
  text-decoration: none;
  transition: color var(--transition-base);
}

.post-card__title a:hover {
  color: var(--primary);
}

/* Enhanced Post Meta */
.post-meta__item {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.post-meta__icon {
  font-size: 0.9em;
  opacity: 0.8;
}

.post-meta__separator {
  color: var(--gray-400);
  margin: 0 var(--spacing-xs);
}

.post-meta__item--updated {
  color: var(--gray-500);
  font-size: 0.95em;
}

/* Post Card Excerpt */
.post-card__excerpt {
  margin: var(--spacing-sm) 0;
  font-size: var(--text-base);
  color: var(--gray-700);
  line-height: 1.7;
}

.post-card__excerpt p {
  margin-bottom: var(--spacing-sm);
}

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

/* Post Card Read More */
.post-card__read-more {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--primary);
  font-weight: var(--font-semibold);
  font-size: var(--text-base);
  text-decoration: none;
  transition: all var(--transition-base);
  margin-top: auto;
  padding-top: var(--spacing-sm);
  width: fit-content;
}

.post-card__read-more:hover {
  color: var(--primary-dark);
  gap: var(--spacing-sm);
}

.read-more-arrow {
  display: inline-block;
  transition: transform var(--transition-base);
}

.post-card__read-more:hover .read-more-arrow {
  transform: translateX(4px);
}

/* Mobile Responsive Post Cards */
@media (max-width: 968px) {
  .post-card__image {
    aspect-ratio: 16 / 9;
  }
  
  .section-title {
    font-size: var(--text-2xl);
  }
}

@media (max-width: 640px) {
  .post-card {
    padding: var(--spacing-lg);
  }
  
  .post-card__image {
    aspect-ratio: 4 / 3;
  }
  
  .post-card__title {
    font-size: var(--text-xl);
  }
  
  .post-meta {
    font-size: var(--text-xs);
  }
  
  .post-meta__item--updated {
    display: none; /* Hide update date on very small screens */
  }
  
  .section-title {
    font-size: var(--text-xl);
  }
}

/* ========================================
   8. Post Content
   ======================================== */
.post-content {
  margin-top: var(--spacing-xl);
  font-size: 1.0625rem;
  color: var(--gray-700);
  line-height: 1.8;
  max-width: 720px;
  margin-left: 0;
}

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

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

/* Content Headings */
.post-content h1,
.post-content h2,
.post-content h3 {
  color: var(--gray-900);
  font-weight: var(--font-bold);
  line-height: 1.3;
  margin-top: 2rem;
  margin-bottom: 1rem;
  scroll-margin-top: 100px;
}

.post-content h1 {
  font-size: var(--text-3xl);
}

.post-content h2 {
  font-size: var(--text-2xl);
  border-bottom: 2px solid var(--gray-200);
  padding-bottom: var(--spacing-sm);
}

.post-content h3 {
  font-size: var(--text-xl);
}

.post-content h4 {
  color: var(--primary-dark);
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-xs);
  border-bottom: 2px solid var(--primary);
}

.post-content h5,
.post-content h6 {
  color: var(--gray-900);
  font-size: var(--text-base);
  font-weight: var(--font-bold);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
}

/* Blockquotes (Legal Citations) */
.post-content blockquote {
  margin: var(--spacing-xl) 0;
  padding: var(--spacing-xl) var(--spacing-2xl);
  background: linear-gradient(135deg, #f0f4f8 0%, #e6ecf2 100%);
  border-left: 5px solid var(--primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  color: var(--gray-800);
  box-shadow: 0 2px 8px rgba(26, 54, 93, 0.1);
  position: relative;
}

.post-content blockquote::before {
  content: '"';
  font-size: 4rem;
  color: var(--primary);
  opacity: 0.2;
  position: absolute;
  top: -10px;
  left: 10px;
  font-family: Georgia, serif;
  line-height: 1;
}

.post-content blockquote p {
  margin-bottom: 0.75rem;
  position: relative;
  z-index: 1;
}

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

/* Lists */
.post-content ul,
.post-content ol {
  margin: var(--spacing-xl) 0;
  padding-left: 2rem;
}

.post-content ul {
  list-style-type: disc;
}

.post-content ol {
  list-style-type: decimal;
}

.post-content li {
  margin-bottom: var(--spacing-md);
  line-height: 1.7;
}

.post-content li::marker {
  color: var(--primary);
  font-weight: var(--font-bold);
}

.post-content ul ul,
.post-content ol ul,
.post-content ul ol,
.post-content ol ol {
  margin-top: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

/* Links */
.post-content a {
  color: var(--primary);
  text-decoration: underline;
  text-decoration-color: rgba(42, 82, 152, 0.3);
  text-underline-offset: 3px;
  transition: all var(--transition-base);
  font-weight: var(--font-medium);
}

.post-content a:hover {
  color: var(--primary-dark);
  text-decoration-color: var(--primary-dark);
  text-decoration-thickness: 2px;
}

/* Text Formatting */
.post-content strong {
  font-weight: var(--font-bold);
  color: var(--gray-900);
}

.post-content em {
  font-style: italic;
}

/* Code blocks (if using markdown code) */
.post-content code {
  background: var(--gray-100);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-family: 'Courier New', monospace;
  font-size: 0.9em;
  color: var(--primary-dark);
}

.post-content pre {
  background: var(--gray-900);
  color: var(--gray-100);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: var(--spacing-xl) 0;
}

.post-content pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}

/* Tables (if present) */
.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-xl) 0;
  font-size: var(--text-sm);
}

.post-content th,
.post-content td {
  border: 1px solid var(--gray-300);
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
}

.post-content th {
  background: var(--gray-100);
  font-weight: var(--font-bold);
  color: var(--gray-900);
}

.post-content tr:nth-child(even) {
  background: var(--gray-50);
}

/* Horizontal Rules */
.post-content hr {
  border: none;
  height: 2px;
  background: linear-gradient(to right, transparent, var(--gray-300), transparent);
  margin: var(--spacing-3xl) 0;
}

/* Images in content */
.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  margin: var(--spacing-xl) 0;
}

/* ========================================
   8a. Reading Progress Bar
   ======================================== */
.reading-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gray-200);
  z-index: 1000;
}

.reading-progress-fill {
  height: 100%;
  background: var(--primary);
  width: 0%;
  transition: width 0.3s ease;
}

/* ========================================
   8b. Social Sharing
   ======================================== */
.social-share {
  margin-top: var(--spacing-3xl);
  padding-top: var(--spacing-2xl);
  border-top: 2px solid var(--gray-200);
  max-width: 720px;
}

.social-share__title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--gray-700);
  margin-bottom: var(--spacing-lg);
}

.social-share__buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.social-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  color: var(--white);
  background: var(--gray-700);
  border: none;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-base);
}

.social-btn svg {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
}

.social-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.social-btn--whatsapp {
  background: #25D366;
}

.social-btn--whatsapp:hover {
  background: #20BA5A;
}

.social-btn--facebook {
  background: #1877F2;
}

.social-btn--facebook:hover {
  background: #0C63D4;
}

.social-btn--twitter {
  background: #1DA1F2;
}

.social-btn--twitter:hover {
  background: #0C8BD9;
}

.social-btn--linkedin {
  background: #0A66C2;
}

.social-btn--linkedin:hover {
  background: #004182;
}

.social-btn--copy {
  background: var(--gray-600);
}

.social-btn--copy:hover {
  background: var(--gray-700);
}

.social-btn--copy.copied {
  background: var(--success);
}

/* ========================================
   8c. Related Posts
   ======================================== */
.related-posts {
  margin-top: var(--spacing-3xl);
  padding-top: var(--spacing-2xl);
  border-top: 2px solid var(--gray-200);
}

.related-posts__title {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--gray-900);
  margin-bottom: var(--spacing-xl);
}

.related-posts__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-xl);
}

.related-post-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-base);
}

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

.related-post-card__link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.related-post-card__image {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
}

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

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

.related-post-card__image--placeholder {
  color: var(--gray-400);
}

.related-post-card__image--placeholder svg {
  width: 64px;
  height: 64px;
}

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

.related-post-card__title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--gray-900);
  margin: 0 0 var(--spacing-md) 0;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.related-post-card__meta {
  display: flex;
  gap: var(--spacing-md);
  font-size: var(--text-sm);
  color: var(--gray-600);
}

.related-post-card__meta span {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

/* ========================================
   8d. Table of Contents
   ======================================== */
.table-of-contents {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
  max-width: 720px;
}

.table-of-contents.collapsed .toc__list {
  display: none;
}

.table-of-contents.collapsed .toc__toggle svg {
  transform: rotate(-90deg);
}

.toc__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
}

.toc__title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--gray-900);
  margin: 0;
}

.toc__toggle {
  background: none;
  border: none;
  color: var(--gray-600);
  cursor: pointer;
  padding: var(--spacing-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: var(--transition-base);
}

.toc__toggle:hover {
  background: var(--gray-200);
  color: var(--gray-900);
}

.toc__toggle svg {
  transition: transform 0.3s ease;
}

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

.toc__item {
  margin: 0;
}

.toc__item--h2 {
  margin-left: 0;
}

.toc__item--h3 {
  margin-left: var(--spacing-lg);
  font-size: var(--text-sm);
}

.toc__link {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--gray-700);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: var(--transition-base);
  line-height: 1.5;
}

.toc__link:hover {
  color: var(--primary);
  background: var(--gray-100);
  border-left-color: var(--gray-300);
}

.toc__link.active {
  color: var(--primary);
  background: var(--primary-50);
  border-left-color: var(--primary);
  font-weight: var(--font-medium);
}

/* ========================================
   9. Sidebar
   ======================================== */
.sidebar {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  align-self: start;
  position: sticky;
  top: var(--spacing-xl);
  border: 1px solid var(--gray-200);
}

.sidebar h3 {
  color: var(--gray-900);
  margin-bottom: 1.25rem;
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  border-bottom: 2px solid var(--primary);
  padding-bottom: var(--spacing-sm);
}

/* ========================================
   10. Tags Component
   ======================================== */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: var(--spacing-sm);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  color: var(--white);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-full);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  transition: all var(--transition-base);
  box-shadow: 0 2px 4px rgba(26, 54, 93, 0.3);
  border: 2px solid transparent;
  white-space: nowrap;
}

.tag:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 6px 12px rgba(26, 54, 93, 0.5);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
}

.tag.active {
  background: linear-gradient(135deg, #f093fb 0%, var(--accent-alt) 100%);
  box-shadow: 0 3px 6px rgba(245, 87, 108, 0.4);
  border-color: rgba(255, 255, 255, 0.3);
  font-weight: var(--font-semibold);
}

.tag.active:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 6px 12px rgba(245, 87, 108, 0.6);
}

/* Tag Size Variants - Variable sizing based on post count */
.tag.tag-md {
  font-size: var(--text-sm);
  padding: var(--spacing-sm) var(--spacing-md);
}

.tag.tag-lg {
  font-size: 0.9375rem;
  padding: 0.625rem var(--spacing-lg);
  font-weight: var(--font-semibold);
}

.tag.tag-xl {
  font-size: var(--text-base);
  padding: var(--spacing-md) var(--spacing-xl);
  font-weight: var(--font-semibold);
}

.tag.tag-2xl {
  font-size: 1.0625rem;
  padding: 0.6875rem var(--spacing-xl);
  font-weight: var(--font-bold);
}

.tag.tag-3xl {
  font-size: 1.125rem;
  padding: 0.75rem 1.5rem;
  font-weight: var(--font-bold);
  box-shadow: 0 3px 6px rgba(26, 54, 93, 0.4);
}

.tag.tag-3xl:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 8px 16px rgba(26, 54, 93, 0.6);
}

/* ========================================
   10.1 Recent Posts Widget
   ======================================== */
.recent-posts-widget {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.recent-post-item {
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--gray-200);
}

.recent-post-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.recent-post-link {
  display: block;
  text-decoration: none;
  transition: all var(--transition-base);
}

.recent-post-link:hover {
  transform: translateX(2px);
}

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

.recent-post-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.recent-post-title {
  color: var(--gray-900);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  line-height: 1.4;
  transition: color var(--transition-base);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.recent-post-date {
  color: var(--gray-600);
  font-size: var(--text-xs);
  display: flex;
  align-items: center;
  gap: 2px;
}

/* ========================================
   10.2 Popular Posts Widget
   ======================================== */
.popular-posts-widget {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.popular-post-item {
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--gray-200);
}

.popular-post-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.popular-post-link {
  display: block;
  text-decoration: none;
  transition: all var(--transition-base);
}

.popular-post-link:hover {
  transform: translateX(2px);
}

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

.popular-post-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.popular-post-title {
  color: var(--gray-900);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  line-height: 1.4;
  transition: color var(--transition-base);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.popular-post-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.popular-post-views {
  color: var(--gray-600);
  font-size: var(--text-xs);
  display: flex;
  align-items: center;
  gap: 3px;
  font-weight: var(--font-medium);
}

/* ========================================
   11. Pagination Component
   ========================================== */
.pagination {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  margin: var(--spacing-3xl) 0;
  flex-wrap: wrap;
}

.pagination a,
.pagination span {
  padding: 0.625rem 1.125rem;
  background: var(--white);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--gray-700);
  border: 1px solid var(--gray-200);
  transition: all var(--transition-base);
  font-weight: var(--font-medium);
}

.pagination a:hover {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  color: var(--white);
  border-color: var(--primary);
  transform: translateY(-1px);
}

.pagination .current {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  color: var(--white);
  border-color: var(--primary);
}

/* ========================================
   12. Button Components
   ======================================== */

/* Base Button */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  text-align: center;
  text-decoration: none;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  font-family: inherit;
  line-height: 1.5;
}

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

/* Button Variants */
.btn--primary {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  color: var(--white);
  border-color: var(--primary);
}

.btn--primary:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn--secondary:hover:not(:disabled) {
  background: var(--primary);
  color: var(--white);
}

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

.btn--ghost:hover:not(:disabled) {
  background: var(--gray-100);
}

.btn--link {
  background: transparent;
  color: var(--primary);
  border: none;
  padding: var(--spacing-xs) 0;
  font-weight: var(--font-semibold);
}

.btn--link:hover:not(:disabled) {
  color: var(--primary-dark);
  text-decoration: underline;
}

/* Button Sizes */
.btn--sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--text-sm);
}

.btn--lg {
  padding: var(--spacing-md) var(--spacing-2xl);
  font-size: var(--text-lg);
}

/* Legacy Read More Button */
.read-more {
  display: inline-block;
  margin-top: 1.25rem;
  color: var(--primary);
  text-decoration: none;
  font-weight: var(--font-semibold);
  font-size: 0.9375rem;
  transition: all var(--transition-base);
  padding: var(--spacing-sm) 0;
}

.read-more:hover {
  color: var(--primary-dark);
  padding-left: var(--spacing-sm);
}

.read-more::after {
  content: ' →';
}

/* ========================================
   12.1 Card Components
   ======================================== */

/* Base Card */
.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
  overflow: hidden;
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

/* Card Parts */
.card__header {
  padding: var(--spacing-lg) var(--spacing-xl);
  border-bottom: 1px solid var(--gray-200);
}

.card__body {
  padding: var(--spacing-xl);
}

.card__footer {
  padding: var(--spacing-lg) var(--spacing-xl);
  border-top: 1px solid var(--gray-200);
  background: var(--gray-50);
}

.card__title {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--gray-900);
  margin: 0;
}

.card__description {
  color: var(--gray-600);
  font-size: var(--text-sm);
  margin-top: var(--spacing-xs);
}

/* Card Variants */
.card--interactive {
  cursor: pointer;
}

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

.card--flat {
  box-shadow: none;
  border: 1px solid var(--gray-200);
}

/* ========================================
   12.2 Form Components
   ======================================== */

/* Form Groups */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-weight: var(--font-medium);
  color: var(--gray-700);
  margin-bottom: var(--spacing-xs);
  font-size: var(--text-sm);
}

.form-label--required::after {
  content: ' *';
  color: var(--accent-alt);
}

/* Text Inputs */
.form-control {
  display: block;
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--text-base);
  line-height: 1.5;
  color: var(--gray-900);
  background: var(--white);
  border: 2px solid var(--gray-300);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  font-family: inherit;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(42, 82, 152, 0.1);
}

.form-control:disabled {
  background: var(--gray-100);
  cursor: not-allowed;
  opacity: 0.6;
}

.form-control::placeholder {
  color: var(--gray-500);
}

/* Textarea */
textarea.form-control {
  resize: vertical;
  min-height: 100px;
}

/* Search Input */
.form-control--search {
  padding-left: var(--spacing-2xl);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%23718096' viewBox='0 0 16 16'%3E%3Cpath d='M11.742 10.344a6.5 6.5 0 1 0-1.397 1.398h-.001c.03.04.062.078.098.115l3.85 3.85a1 1 0 0 0 1.415-1.414l-3.85-3.85a1.007 1.007 0 0 0-.115-.1zM12 6.5a5.5 5.5 0 1 1-11 0 5.5 5.5 0 0 1 11 0z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: var(--spacing-sm) center;
}

/* Select Dropdown */
select.form-control {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23718096' viewBox='0 0 16 16'%3E%3Cpath d='M7.247 11.14L2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--spacing-sm) center;
  padding-right: var(--spacing-2xl);
}

/* Checkbox and Radio */
.form-check {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.form-check-input {
  width: 18px;
  height: 18px;
  margin: 0;
  cursor: pointer;
}

.form-check-label {
  cursor: pointer;
  font-size: var(--text-base);
  color: var(--gray-700);
}

/* Form Help Text */
.form-help {
  display: block;
  margin-top: var(--spacing-xs);
  font-size: var(--text-xs);
  color: var(--gray-600);
}

/* Form Validation States */
.form-control.is-invalid {
  border-color: var(--accent-alt);
}

.form-control.is-invalid:focus {
  box-shadow: 0 0 0 3px rgba(245, 87, 108, 0.1);
}

.form-control.is-valid {
  border-color: #48bb78;
}

.form-control.is-valid:focus {
  box-shadow: 0 0 0 3px rgba(72, 187, 120, 0.1);
}

.invalid-feedback {
  display: block;
  margin-top: var(--spacing-xs);
  font-size: var(--text-xs);
  color: var(--accent-alt);
}

.valid-feedback {
  display: block;
  margin-top: var(--spacing-xs);
  font-size: var(--text-xs);
  color: #48bb78;
}

/* ========================================
   13. File Attachments
   ======================================== */
.arquivos {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-xl);
  border-top: 2px solid var(--gray-200);
}

.arquivos h4 {
  color: var(--gray-900);
  margin-bottom: var(--spacing-md);
  font-weight: var(--font-semibold);
}

.arquivos ul {
  list-style: none;
}

.arquivos li {
  margin-bottom: 0.75rem;
  padding-left: var(--spacing-lg);
  position: relative;
}

.arquivos li::before {
  content: '📎';
  position: absolute;
  left: 0;
}

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

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

/* ========================================
   13. Mobile Responsive Styles
   ======================================== */

/* Social Sharing on Mobile */
@media (max-width: 640px) {
  .social-share__buttons {
    flex-direction: column;
  }
  
  .social-btn {
    width: 100%;
    justify-content: center;
  }
  
  .related-posts__grid {
    grid-template-columns: 1fr;
  }
  
  .table-of-contents {
    margin-left: calc(-1 * var(--spacing-md));
    margin-right: calc(-1 * var(--spacing-md));
    border-radius: 0;
  }
}

@media (max-width: 768px) {
  .post-content {
    font-size: var(--text-base);
  }
  
  .post-content h1 {
    font-size: var(--text-2xl);
  }
  
  .post-content h2 {
    font-size: var(--text-xl);
  }
  
  .post-content h3 {
    font-size: var(--text-lg);
  }
  
  .related-posts__grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--spacing-lg);
  }
}

/* ========================================
   14. Footer
   ======================================== */
footer {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  color: var(--white);
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
  margin-top: 4rem;
  box-shadow: 0 -4px 6px rgba(0, 0, 0, 0.1);
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--spacing-3xl);
  margin-bottom: var(--spacing-2xl);
  padding-bottom: var(--spacing-2xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.footer-section {
  display: flex;
  flex-direction: column;
}

.footer-title {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  margin: 0 0 var(--spacing-md) 0;
  color: var(--white);
}

.footer-description {
  font-size: var(--text-sm);
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.9);
  margin: 0;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-links li {
  margin: 0;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  font-size: var(--text-sm);
  transition: var(--transition-base);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.footer-links a:hover {
  color: var(--white);
  transform: translateX(3px);
}

.footer-links svg {
  flex-shrink: 0;
}

.footer-bottom {
  text-align: center;
}

.footer-copyright {
  opacity: 0.9;
  font-weight: var(--font-normal);
  font-size: var(--text-sm);
  margin: 0;
}

/* Footer Mobile Responsive */
@media (max-width: 768px) {
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    text-align: center;
  }
  
  .footer-links {
    align-items: center;
  }
  
  .footer-links a:hover {
    transform: none;
  }
}

/* ========================================
   15. Error Pages
   ======================================== */
.error-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: var(--spacing-3xl) 0;
}

.error-page__content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.error-page__icon {
  color: var(--primary);
  margin-bottom: var(--spacing-xl);
  opacity: 0.7;
}

.error-page__icon--error {
  color: var(--error);
}

.error-page__icon svg {
  display: inline-block;
}

.error-page__title {
  font-size: 6rem;
  font-weight: var(--font-bold);
  color: var(--gray-300);
  margin: 0;
  line-height: 1;
}

.error-page__subtitle {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--gray-900);
  margin: var(--spacing-md) 0 var(--spacing-lg) 0;
}

.error-page__message {
  font-size: var(--text-lg);
  color: var(--gray-600);
  margin-bottom: var(--spacing-2xl);
  line-height: 1.6;
}

.error-page__actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--spacing-2xl);
}

.error-page__actions .btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.error-page__help {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
  text-align: left;
}

.error-page__help h3 {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--gray-900);
  margin: 0 0 var(--spacing-md) 0;
}

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

.error-page__help li {
  padding: var(--spacing-sm) 0;
  color: var(--gray-700);
  position: relative;
  padding-left: var(--spacing-lg);
}

.error-page__help li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: var(--font-bold);
}

/* Error Page Mobile */
@media (max-width: 640px) {
  .error-page__title {
    font-size: 4rem;
  }
  
  .error-page__subtitle {
    font-size: var(--text-2xl);
  }
  
  .error-page__actions {
    flex-direction: column;
  }
  
  .error-page__actions .btn {
    width: 100%;
    justify-content: center;
  }
}

/* ========================================
   15a. Search Results
   ======================================== */
.search-results-section {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--spacing-2xl);
}

.search-results-header {
  text-align: center;
  padding-bottom: var(--spacing-2xl);
  border-bottom: 2px solid var(--gray-200);
  margin-bottom: var(--spacing-2xl);
}

.search-results-title {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--gray-900);
  margin: 0 0 var(--spacing-md) 0;
}

.search-query {
  font-size: var(--text-lg);
  color: var(--gray-700);
  margin: var(--spacing-sm) 0;
}

.search-query strong {
  color: var(--primary);
}

.search-count {
  font-size: var(--text-base);
  color: var(--gray-600);
  margin: var(--spacing-sm) 0 0 0;
}

/* No Results State */
.no-results {
  text-align: center;
  padding: var(--spacing-3xl) 0;
}

.no-results__icon {
  color: var(--gray-400);
  margin-bottom: var(--spacing-xl);
}

.no-results__icon svg {
  display: inline-block;
}

.no-results__title {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--gray-900);
  margin: 0 0 var(--spacing-md) 0;
}

.no-results__message {
  font-size: var(--text-lg);
  color: var(--gray-600);
  margin-bottom: var(--spacing-2xl);
}

.no-results__suggestions {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  margin: var(--spacing-2xl) auto;
  max-width: 500px;
  text-align: left;
}

.no-results__suggestions h3 {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--gray-900);
  margin: 0 0 var(--spacing-md) 0;
}

.no-results__suggestions ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.no-results__suggestions li {
  padding: var(--spacing-sm) 0;
  color: var(--gray-700);
  position: relative;
  padding-left: var(--spacing-lg);
}

.no-results__suggestions li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: var(--font-bold);
}

.no-results__actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* Empty Search State */
.search-empty {
  text-align: center;
  padding: var(--spacing-3xl) 0;
}

.search-empty__icon {
  color: var(--primary);
  opacity: 0.5;
  margin-bottom: var(--spacing-xl);
}

.search-empty__icon svg {
  display: inline-block;
}

.search-empty__title {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--gray-900);
  margin: 0 0 var(--spacing-md) 0;
}

.search-empty__message {
  font-size: var(--text-lg);
  color: var(--gray-600);
  max-width: 500px;
  margin: 0 auto;
  line-height: 1.6;
}

/* Search Results Mobile */
@media (max-width: 640px) {
  .search-results-section {
    padding: var(--spacing-lg);
  }
  
  .search-results-title {
    font-size: var(--text-2xl);
  }
  
  .search-query {
    font-size: var(--text-base);
  }
  
  .no-results__actions {
    flex-direction: column;
  }
  
  .no-results__actions .btn {
    width: 100%;
  }
}

/* ========================================
   15b. Mobile-Specific Optimizations
   ======================================== */

/* Mobile Header Optimization */
@media (max-width: 768px) {
  header {
    padding: var(--spacing-xl) 0 var(--spacing-lg) 0;
  }
  
  .site-name {
    font-size: var(--text-2xl);
  }
  
  .site-description {
    font-size: var(--text-base);
  }
  
  .header-actions {
    gap: var(--spacing-xs);
  }
  
  .header-icon {
    width: 36px;
    height: 36px;
    font-size: var(--text-base);
  }
}

@media (max-width: 480px) {
  .site-name {
    font-size: var(--text-xl);
    line-height: 1.3;
  }
  
  .site-description {
    font-size: var(--text-sm);
  }
  
  .header-actions {
    position: relative;
    justify-content: center;
    margin-top: var(--spacing-md);
  }
}

/* Mobile Sidebar Enhancements */
@media (max-width: 968px) {
  .sidebar {
    margin-top: var(--spacing-2xl);
    border-radius: var(--radius-md);
  }
  
  .sidebar h3 {
    font-size: var(--text-lg);
  }
}

@media (max-width: 640px) {
  .sidebar {
    padding: var(--spacing-lg);
  }
  
  .widget {
    margin-bottom: var(--spacing-xl);
  }
}

/* Mobile Typography */
@media (max-width: 480px) {
  body {
    font-size: 15px;
  }
  
  .post-content {
    padding: 0 var(--spacing-sm);
  }
  
  .post-content h1 {
    font-size: var(--text-xl);
    line-height: 1.3;
  }
  
  .post-content h2 {
    font-size: var(--text-lg);
  }
  
  .post-content h3 {
    font-size: var(--text-base);
  }
}

/* Touch Target Optimization - Ensure 44x44px minimum */
@media (max-width: 768px) {
  /* Tags */
  .tag {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
  }
  
  /* Buttons */
  .btn,
  .social-btn {
    min-height: 44px;
    padding: var(--spacing-md) var(--spacing-lg);
  }
  
  /* Pagination */
  .pagination__link {
    min-width: 44px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  
  /* Post card links */
  .post-card__read-more {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }
  
  /* Footer links */
  .footer-links a {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-sm) 0;
  }
}

/* Mobile Container Padding */
@media (max-width: 640px) {
  .container {
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
  }
  
  .search-results-section,
  .error-page {
    padding: var(--spacing-lg);
  }
  
  /* Reduce margins on mobile */
  .post-list {
    gap: var(--spacing-lg);
  }
  
  .section-title {
    font-size: var(--text-xl);
    margin-bottom: var(--spacing-lg);
  }
}

/* Very Small Screens (320px-480px) */
@media (max-width: 480px) {
  .search-input {
    font-size: 16px; /* Prevents zoom on iOS */
    padding: var(--spacing-sm) var(--spacing-md);
    padding-right: 45px;
  }
  
  .search-button {
    width: 36px;
    height: 36px;
  }
  
  .post-card {
    padding: var(--spacing-md);
  }
  
  .post-card__title {
    font-size: var(--text-lg);
    line-height: 1.4;
  }
  
  .post-card__meta {
    font-size: var(--text-xs);
  }
  
  .tag {
    font-size: var(--text-xs);
    padding: 4px var(--spacing-sm);
  }
}

/* Landscape Mobile Optimization */
@media (max-width: 968px) and (orientation: landscape) {
  header {
    padding: var(--spacing-lg) 0;
  }
  
  .search-bar {
    padding: var(--spacing-sm) 0;
  }
  
  .sidebar {
    margin-top: var(--spacing-xl);
  }
}

/* ========================================
   15c. Scroll to Top Button
   ======================================== */
.scroll-to-top {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: var(--white);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transform: scale(0.8);
  transition: all var(--transition-base);
}

.scroll-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: scale(1);
}

.scroll-to-top:hover {
  background: var(--primary-dark);
  transform: scale(1.1);
  box-shadow: var(--shadow-xl);
}

.scroll-to-top:active {
  transform: scale(0.95);
}

.scroll-to-top svg {
  width: 24px;
  height: 24px;
}

/* Mobile Scroll to Top */
@media (max-width: 640px) {
  .scroll-to-top {
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 44px;
    height: 44px;
  }
  
  .scroll-to-top svg {
    width: 20px;
    height: 20px;
  }
}

/* ========================================
   15d. Breadcrumb Navigation
   ======================================== */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-md);
  background: var(--white);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  box-shadow: var(--shadow-sm);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.breadcrumb__link {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-base);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
}

.breadcrumb__link:hover {
  color: var(--primary-dark);
  background: var(--gray-50);
}

.breadcrumb__separator {
  color: var(--gray-400);
  user-select: none;
  margin: 0 var(--spacing-xs);
}

.breadcrumb__current {
  color: var(--gray-700);
  font-weight: var(--font-medium);
  padding: var(--spacing-xs) var(--spacing-sm);
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Mobile Breadcrumb */
@media (max-width: 768px) {
  .breadcrumb {
    font-size: var(--text-xs);
    padding: var(--spacing-sm);
    gap: 2px;
  }
  
  .breadcrumb__separator {
    margin: 0;
  }
  
  .breadcrumb__link,
  .breadcrumb__current {
    padding: var(--spacing-xs);
  }
  
  .breadcrumb__current {
    max-width: 200px;
  }
}

/* ========================================
   16. Utilities
   ======================================== */

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

/* Skip to Content (Accessibility) */
.skip-to-content {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--primary);
  color: var(--white);
  padding: var(--spacing-md) var(--spacing-lg);
  text-decoration: none;
  font-weight: var(--font-semibold);
  z-index: 9999;
  border-radius: 0 0 var(--radius-md) 0;
  transition: top 0.3s ease;
}

.skip-to-content:focus {
  top: 0;
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

/* Focus Visible - Enhanced keyboard navigation */
:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

button:focus-visible,
a:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}

/* Smooth Scroll Behavior */
html {
  scroll-behavior: smooth;
}

/* Reduce Motion for Accessibility */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  
  .scroll-to-top,
  .reading-progress-fill {
    transition: none !important;
  }
}

/* Loading State */
.loading {
  pointer-events: none;
  opacity: 0.6;
  cursor: wait;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 24px;
  height: 24px;
  margin: -12px 0 0 -12px;
  border: 3px solid var(--gray-300);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

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

::-moz-selection {
  background: var(--primary);
  color: var(--white);
}

/* Print Styles */
@media print {
  /* Hide non-essential elements */
  header,
  .search-bar,
  .sidebar,
  footer,
  .social-share,
  .related-posts,
  .scroll-to-top,
  .reading-progress-bar {
    display: none !important;
  }
  
  /* Main content */
  .main-content {
    grid-template-columns: 1fr;
    max-width: 100%;
  }
  
  .post-content {
    max-width: 100%;
    font-size: 12pt;
    line-height: 1.5;
    color: #000;
  }
  
  /* Links */
  a {
    color: #000;
    text-decoration: underline;
  }
  
  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 10pt;
    color: #666;
  }
  
  /* Images */
  img {
    max-width: 100%;
    page-break-inside: avoid;
  }
  
  /* Page breaks */
  h1, h2, h3 {
    page-break-after: avoid;
  }
  
  .post-card {
    page-break-inside: avoid;
  }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  :root {
    --primary: #0000FF;
    --gray-900: #000000;
    --gray-600: #333333;
  }
  
  button,
  .btn {
    border: 2px solid currentColor;
  }
}

/* Display Utilities */
.hidden {
  display: none !important;
}

.mobile-only {
  display: none;
}

@media (max-width: 768px) {
  .desktop-only {
    display: none !important;
  }
  
  .mobile-only {
    display: block;
  }
}

/* Text Utilities */
.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

/* Spacing Utilities */
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mb-md { margin-bottom: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mb-xl { margin-bottom: var(--spacing-xl); }