/* Progress Bar */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-info));
  z-index: calc(var(--z-modal) + 1);
  transition: width 0.1s ease-out;
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: var(--space-md) var(--space-lg);
  text-decoration: none;
  border-radius: 0 0 var(--radius-md) 0;
  z-index: var(--z-tooltip);
}

.skip-link:focus {
  top: 0;
}

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

@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-lg);
  }
}

/* Navigation */
.nav {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: var(--glass-bg);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--glass-border);
}

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

@media (max-width: 768px) {
  .nav-container {
    padding: 0 var(--space-lg);
  }
}

.nav-logo {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  transition: color 0.2s ease;
  display: inline-block;
  max-width: 300px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

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

.nav-logo:active {
  opacity: 0.7;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* Buttons */
.btn-icon {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  color: var(--color-text);
}

.btn-icon:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.btn-icon:active {
  transform: translateY(0);
}

@media (prefers-color-scheme: dark) {
  .btn-icon:hover {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  }
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.btn-secondary:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.btn-secondary:active {
  transform: translateY(0);
}

@media (prefers-color-scheme: dark) {
  .btn-secondary:hover {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  }
}

kbd, .search-shortcut {
  display: inline-block;
  font-size: 11px;
  font-family: var(--font-mono);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  border-radius: 5px;
  padding: 3px 7px;
}

@media (max-width: 768px) {
  .search-shortcut {
    display: none;
  }
}

/* Hero Section */
.hero {
  /* Use fluid spacing instead of large fixed blocks */
  padding-block: clamp(2rem, 5vw, 4rem);
  padding-inline: clamp(1rem, 3vw, 3rem);
  gap: clamp(0.5rem, 2vw, 1.5rem);
  text-align: center;
}

@media (max-width: 768px) {
  .hero {
    padding: var(--space-3xl) 0 var(--space-2xl);
  }
}

/* Extra-small screens: hide tagline to avoid cramped layout */
@media (max-width: 360px) {
  .hero-tagline { display: none; }
}

.hero-title {
  /* Fluid size for tiny viewports → avoids awkward wrapping */
  font-size: clamp(2rem, 6vw, var(--font-size-5xl));
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-md);
  letter-spacing: -0.03em;
  
  /* Truncate long blog names */
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  word-wrap: break-word;
}

@media (max-width: 768px) {
  .hero-title {
    font-size: var(--font-size-4xl);
  }
}

.hero-tagline {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
  
  /* Truncate long taglines */
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
}

.hero-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
}

/* Search Overlay */
.search-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: var(--z-modal);
  display: none;
  padding: var(--space-2xl);
}

.search-overlay.active {
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.search-container {
  width: 100%;
  max-width: 600px;
  background: var(--color-background);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
  margin-top: 10vh;
  /* Ensure hover glows/lifts inside never clip at the edges */
  overflow: visible;
}

.search-box {
  position: relative;
  display: flex;
  align-items: center;
  /* Keep a single line; pills area will scroll horizontally */
  flex-wrap: nowrap;
  gap: var(--space-xs);
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-border);
  min-height: 56px;
  /* Never clip pill hover shadows/lift */
  overflow: visible;
}

/* Ensure the leading magnifier icon never shrinks in the flex row */
.search-box > svg { flex: 0 0 auto; margin-right: 8px; }

.search-box input {
  /* Input fills remaining space next to chips */
  flex: 1 1 auto;
  min-width: 12px;
  border: none;
  background: none;
  font-size: var(--font-size-md);
  color: var(--color-text);
  outline: none;
}

.search-box input::-webkit-search-cancel-button {
  -webkit-appearance: none;
  appearance: none;
  display: none;
}

/* Search pills are styled later in this file (lines ~2000)
   This section was moved to keep all search styles together */

/* Autocomplete suggestions */
.suggestions-list {
  position: absolute;
  top: calc(100% + 4px);
  left: var(--space-lg);
  right: var(--space-lg);
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  max-height: 200px;
  overflow-y: auto;
  z-index: calc(var(--z-modal) + 1);
  display: none;
}

.suggestion-item {
  padding: var(--space-sm) var(--space-md);
  cursor: pointer;
  transition: background var(--transition-fast);
  font-size: var(--font-size-sm);
}

.suggestion-item:hover,
.suggestion-item.selected {
  background: var(--color-surface-hover);
  color: var(--color-primary);
}

.suggestion-item:first-child {
  border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.suggestion-item:last-child {
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.btn-close {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
  color: var(--color-text-tertiary);
  transition: all var(--transition-fast);
  border-radius: var(--radius-sm);
  flex: 0 0 auto; /* never shrink below intrinsic size */
  align-self: center;
}

.btn-close:hover {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.btn-close:active {
  transform: scale(0.95);
}

@media (prefers-color-scheme: light) {
  .btn-close {
    color: #9CA3AF;
  }
  .btn-close:hover {
    color: #1F2937;
  }
}

@media (prefers-color-scheme: dark) {
  .btn-close {
    color: #D1D5DB;
  }
  .btn-close:hover {
    color: #F9FAFB;
  }
}

.search-results {
  max-height: 400px;
  overflow-y: auto;
  padding: var(--space-sm);
}

.search-empty {
  text-align: center;
  padding: var(--space-2xl);
  color: var(--color-text-secondary);
}

.search-result {
  padding: var(--space-md);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  text-decoration: none;
  display: block;
  color: inherit;
  border: 1px solid transparent;
  background: transparent;
  position: relative;
}

.search-result:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  transform: scale(1.015);
  box-shadow: 0 4px 20px rgba(0, 122, 255, 0.2), inset 0 0 0 1px rgba(0, 122, 255, 0.1);
}

.search-result:hover .chip {
  transform: none; /* keep steady, no glow-like scaling */
}

.search-result:hover .chip.highlighted {
  box-shadow: 0 4px 12px rgba(0, 122, 255, 0.5);
}

@media (prefers-color-scheme: dark) {
  .search-result:hover {
    box-shadow: 0 4px 20px rgba(88, 166, 255, 0.3), inset 0 0 0 1px rgba(88, 166, 255, 0.15);
  }
  
  .search-result:hover .chip.highlighted {
    box-shadow: 0 4px 12px rgba(88, 166, 255, 0.6);
  }
}

.search-result:hover .search-result-title {
  color: var(--color-primary);
  transform: none;
}

.search-result:active {
  transform: scale(0.99);
}

.search-result-title {
  font-weight: 600;
  font-size: 16px;
  margin-bottom: var(--space-xs);
  transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  line-height: 1.4;
}

.search-result-excerpt {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
}

/* Free-text highlight marks in search results - Modern with enhanced visibility */
mark.search-highlight {
  background: linear-gradient(120deg, transparent 0%, var(--color-primary-light) 20%, var(--color-primary-light) 80%, transparent 100%);
  color: var(--color-text);
  font-weight: 600;
  padding: 2px 4px;
  border-radius: 3px;
  box-shadow: inset 0 0 0 1px rgba(0, 122, 255, 0.3);
  animation: highlightPulse 0.6s ease-out;
}

@keyframes highlightPulse {
  0% {
    box-shadow: inset 0 0 0 2px var(--color-primary), 0 0 8px rgba(0, 122, 255, 0.4);
  }
  100% {
    box-shadow: inset 0 0 0 1px rgba(0, 122, 255, 0.3), 0 0 0px rgba(0, 122, 255, 0);
  }
}

/* Dark mode - enhanced contrast */
@media (prefers-color-scheme: dark) {
  mark.search-highlight {
    background: linear-gradient(120deg, transparent 0%, rgba(88, 166, 255, 0.3) 20%, rgba(88, 166, 255, 0.3) 80%, transparent 100%);
    box-shadow: inset 0 0 0 1px rgba(88, 166, 255, 0.5);
  }
}

.search-result-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
}

.search-result-chips .chip {
  font-size: 12px;
  padding: 3px 8px;
}

.search-result-chips .chip.highlighted {
  background: var(--color-primary) !important;
  color: white !important;
  box-shadow: none; /* remove glow to avoid translucent halo */
  animation: none;
}

/* FIX: Intelligent search fallback styling
 * RESEARCH: Material Design helpful empty states
 * SOLUTION: Clear visual distinction for fallback suggestions */

.search-fallback {
  padding: var(--space-lg);
}

.search-fallback-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  margin-bottom: var(--space-lg);
}

.search-fallback-header svg {
  flex-shrink: 0;
  color: var(--color-text-secondary);
}

.search-fallback-header p {
  margin: 0;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.search-result-fallback {
  opacity: 0.85;
}

.search-result-fallback:hover {
  opacity: 1;
}

.search-result-meta {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  margin-top: var(--space-xs);
}

@keyframes highlightPulse {
  0% {
    transform: scale(1);
    box-shadow: 0 0 0 rgba(0, 122, 255, 0);
  }
  50% {
    transform: scale(1.08);
    box-shadow: 0 4px 16px rgba(0, 122, 255, 0.4);
  }
  100% {
    transform: scale(1);
    box-shadow: 0 2px 8px rgba(0, 122, 255, 0.3);
  }
}

@media (prefers-color-scheme: dark) {
  .search-result-chips .chip.highlighted {
    box-shadow: 0 2px 8px rgba(88, 166, 255, 0.4);
  }
  
  @keyframes highlightPulse {
    0% {
      box-shadow: 0 0 0 rgba(88, 166, 255, 0);
    }
    50% {
      box-shadow: 0 4px 16px rgba(88, 166, 255, 0.5);
    }
    100% {
      box-shadow: 0 2px 8px rgba(88, 166, 255, 0.4);
    }
  }
}

/* Posts Section */
.posts-section {
  padding: 0 0 var(--space-4xl);
  min-height: calc(100vh - var(--nav-height) - 400px);
}

@media (max-width: 768px) {
  .posts-section {
    min-height: auto;
    padding: 0 0 var(--space-2xl);
  }
}

.posts-grid {
  display: grid;
  /* Smart grid that prevents excessive blank space, caps card width naturally */
  grid-template-columns: repeat(auto-fit, minmax(clamp(280px, 30vw, 350px), 1fr));
  gap: var(--space-lg);
  align-items: start;
  min-height: 60vh; /* prevents excessive scrolling on sparse content */
}

@media (max-width: 768px) {
  .posts-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

/* Post Card */
.post-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
  text-decoration: none;
  color: inherit;
  height: 100%;
  border: 1px solid var(--color-border);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.post-card:hover {
  transform: translateY(-3px) scale(1.005);
  box-shadow: 0 12px 32px rgba(0, 122, 255, 0.12);
  border-color: var(--color-primary);
  background: linear-gradient(135deg, rgba(0, 122, 255, 0.02) 0%, rgba(0, 122, 255, 0.01) 100%);
}

@media (prefers-color-scheme: dark) {
  .post-card {
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  }
  .post-card:hover {
    box-shadow: 0 12px 32px rgba(88, 166, 255, 0.2);
    background: linear-gradient(135deg, rgba(88, 166, 255, 0.03) 0%, rgba(88, 166, 255, 0.015) 100%);
  }
}

.post-card:hover .post-card-title {
  color: var(--color-primary);
  transform: translateX(2px);
}

.post-card-title {
  transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.post-card:active {
  transform: translateY(-3px) scale(1);
}

/* FIX: Screenshot shows broken image boxes not visually attractive
 * RESEARCH: Material Design elevation and color psychology (blue = trust, calm)
 * PSYCHOLOGY: Empty states should be inviting, not jarring (emotional design)
 * SOLUTION: Beautiful gradients with 'No Preview' label, smooth animations */

.post-card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background: linear-gradient(135deg, #E3F2FD 0%, #BBDEFB 50%, #90CAF9 100%);
  position: relative;
  overflow: hidden;
}

/* Beautiful gradient placeholders (no text needed - gradients speak for themselves)
 * PSYCHOLOGY: Clean, abstract visuals reduce cognitive load
 * DESIGN: Gradients set by getDeterministicGradient() in js/modules/gradients.js */
.post-card-image.no-image,
.post-card-gradient {
  display: block;
  position: relative;
  overflow: hidden;
}

/* Subtle shimmer effect for visual interest */
.post-card-image.no-image::before,
.post-card-gradient::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 50%, rgba(255, 255, 255, 0.15) 0%, transparent 50%);
  animation: shimmer 4s ease-in-out infinite;
  pointer-events: none;
}

@keyframes shimmer {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 0.8; }
}

@media (prefers-color-scheme: dark) {
  .post-card-image {
    background: linear-gradient(135deg, #1A2332 0%, #243447 50%, #2A3F5F 100%);
  }
  
  /* Shimmer effect darker in dark mode */
  .post-card-image.no-image::before,
  .post-card-gradient::before {
    background: 
      radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.08) 0%, transparent 50%),
      radial-gradient(circle at 80% 50%, rgba(255, 255, 255, 0.12) 0%, transparent 50%);
  }
}

.post-card-content {
  padding: var(--space-lg);
  flex: 1; /* Fill available height */
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  min-height: 0; /* Allow flex children to shrink */
}

/* Adaptive padding when taxonomy disabled */
.post-card-content:not(:has(.post-card-topic-text)):not(:has(.post-card-tags)) {
  padding-top: var(--space-md);
}

.post-card-content:not(:has(.post-card-topic-text)) .post-card-tags {
  margin-top: -4px;
}

/* Adaptive spacing when features disabled */
.post-card:not(:has(.post-card-image)) .post-card-content {
  padding: var(--space-md) var(--space-lg);
}

.post-card:not(:has(.post-card-image)):not(:has(.post-card-tags)) .post-card-content {
  padding: var(--space-md);
}

.post-card:not(:has(.post-card-image)):not(:has(.post-card-excerpt)) {
  min-height: auto;
}

.post-card-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-text);
  transition: color var(--transition-base);
  line-height: var(--line-height-tight);
  
  /* Multi-line clamping with ellipsis */
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  max-height: 4.2em;
  
  /* Fallback for older browsers + hyphenation */
  word-wrap: break-word;
  overflow-wrap: break-word;
  hyphens: auto;
  -webkit-hyphens: auto;
  -moz-hyphens: auto;
  width: 100%;
  cursor: pointer;
}

/* Mobile: Smaller titles */
@media (max-width: 640px) {
  .post-card-title {
    font-size: var(--font-size-lg);
    -webkit-line-clamp: 2;
    max-height: 2.8em;
  }
}

/* Extra small screens */
@media (max-width: 360px) {
  .post-card-title {
    font-size: var(--font-size-md);
    -webkit-line-clamp: 2;
    max-height: 2.6em;
  }
}

.post-card-excerpt {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  flex: 1; /* Expand to fill space */
  min-height: 3em; /* Minimum 2 lines */
  
  /* Truncate long excerpts */
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  max-height: 5.4em;
}

/* When no image: allow more excerpt lines */
.post-card:not(:has(.post-card-image)) .post-card-excerpt {
  -webkit-line-clamp: 4;
  max-height: 7.2em;
}

.post-card-excerpt:empty {
  display: none;
}

/* Tooltip for full text on hover */
.post-card-title[title],
.post-card-excerpt[title] {
  cursor: help;
}

/* ========================================
   CHIP SYSTEM (TOPICS + TAGS)
======================================== */

/* Topic as bold text */
.post-card-topic-text {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: var(--space-xs);
  transition: color var(--transition-fast);
  
  /* Truncate long topics */
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
}

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

.post-card-topic-text:empty {
  display: none;
  margin: 0;
}

/* FIX: Screenshot shows pills overflowing horizontally on mobile
 * RESEARCH: Progressive disclosure with scroll + fade (Material Design overflow patterns)
 * PSYCHOLOGY: Fade indicators signal "more content" without overwhelming (visual affordance)
 * SOLUTION: Horizontal scroll with gradient fade-out on overflow */

/**
 * Tags row below topic
 * RESEARCH: Gestalt Principles - Visual alignment creates perceived grouping
 * WHY: Tags were vertically misaligned with adjacent text
 * FIX: Changed align-items from flex-start to center
 */
.post-card-tags {
  display: flex;
  flex-wrap: wrap;  /* ✅ FIXED: Tags wrap like text (GitHub/Linear pattern) */
  gap: var(--space-xs);
  margin-bottom: var(--space-sm);
  align-items: center;
  max-width: 100%;
  position: relative;
}

.post-card-tags:empty {
  display: none;
  margin: 0;
}

/* Taxonomy row (topic + tags at top) - DEPRECATED but keep for backward compat */
.post-card-taxonomy {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
  align-items: center;
}

.post-card-taxonomy:empty {
  display: none;
  margin: 0;
}

/* Base chip styles */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5ch;
  font-size: 13px;
  font-weight: 500;
  line-height: 1;
  border-radius: 14px;
  padding: 6px 12px;
  cursor: pointer;
  border: none;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  user-select: none;
  white-space: nowrap;
  flex-shrink: 0;  /* ✅ CRITICAL: Don't shrink tags */
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: none !important;
  position: relative;
}

/* Fallback for browsers without backdrop filter */
html[data-no-backdrop] .chip {
  background-opacity: 1;
}

html[data-no-backdrop] .chip-topic {
  background: var(--color-surface);
}

html[data-no-backdrop] .chip-tag {
  background: var(--color-surface-hover);
}

/* Topic chip - subtle, clean hover (no clipping, soft shadow) */
.chip-topic {
  background: var(--color-primary-light);
  color: var(--color-text-secondary);
  font-size: 11px;
  padding: 5px 10px;
  letter-spacing: 0.3px;
  border: 1px solid transparent;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  /* Prevent clipping on hover */
  position: relative;
  z-index: 1;
}

.chip-topic:hover {
  color: var(--color-primary);
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  /* Subtle lift - 1px only, no transform to avoid clipping */
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  /* Bring forward on hover to prevent clipping */
  z-index: 10;
}

@media (prefers-color-scheme: dark) {
  .chip-topic:hover {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  }
}

/* Tag chip - polished with smooth hover effects */
.chip-tag {
  background: var(--color-primary-light);
  color: var(--color-text-secondary);
  border: 1px solid transparent;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  z-index: 1;
}

.chip-tag:hover {
  color: var(--color-primary);
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  transform: scale(1.03);  /* Subtle lift on hover */
  z-index: 10;
}

@media (prefers-color-scheme: dark) {
  .chip-tag:hover {
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
  }
}

/* Expanded tags - slight animation on reveal */
.chip-tag.chip-expanded {
  animation: tagFadeIn 0.3s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes tagFadeIn {
  from {
    opacity: 0;
    transform: translateY(-4px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/**
 * +N more chip - Clickable expansion
 * RESEARCH: Fitts's Law - Interactive elements need pointer cursor
 * WHY: Users expect cursor: pointer on clickable elements
 * POLISH: Smooth animations, clear hover states
 */
.chip-more {
  background: rgba(0, 0, 0, 0.025);
  color: var(--color-text-tertiary);
  cursor: pointer;
  font-size: 12px;
  opacity: 0.8;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid rgba(0, 0, 0, 0.05);
}

.chip-more:hover {
  background: rgba(0, 0, 0, 0.05);
  opacity: 1;
  transform: scale(1.05);
  border-color: rgba(0, 0, 0, 0.1);
}

/* Collapse button (− symbol) */
.chip-more.chip-collapse {
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: 18px;
  font-weight: 600;
  opacity: 1;
  line-height: 1;
  padding: 6px 10px;
  border: 1px solid var(--color-primary);
}

.chip-more.chip-collapse:hover {
  background: var(--color-primary);
  color: white;
  transform: scale(1.08);
  box-shadow: 0 2px 8px rgba(0, 122, 255, 0.25);
}

/* Legacy expanded class support */
.chip-more.expanded {
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: 16px;
  font-weight: 600;
  opacity: 1;
}

.chip-more.expanded:hover {
  background: var(--color-primary);
  color: white;
  transform: scale(1.08);
}

@media (prefers-color-scheme: dark) {
  .chip-more {
    background: rgba(255, 255, 255, 0.06);
  }
  
  .chip-more.expanded {
    background: rgba(88, 166, 255, 0.2);
    color: var(--color-primary);
  }
}

/* Active state + Touch feedback */
.chip:active:not(.chip-more),
.chip.touch-active:not(.chip-more) {
  transform: scale(0.97);
  background: var(--color-primary-light);
}

/* Keyboard focus ring - WCAG 2.2 AA requirement */
.chip:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px var(--color-primary-light);
  z-index: 100;
}

/* Remove default outline, rely on focus-visible */
.chip:focus:not(:focus-visible) {
  outline: none;
}

/* Highlighted chips in search results */
.chip.highlighted {
  background: var(--color-primary) !important;
  color: white !important;
  box-shadow: 0 2px 8px rgba(0, 122, 255, 0.25);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Touch target minimum size - Mobile accessibility */
@media (pointer: coarse) {
  .chip {
    min-height: 44px;
    min-width: 44px;
    padding: 12px 16px;
  }
  
  .chip-more {
    min-height: 44px;
    min-width: 44px;
    padding: 12px;
  }
}

/* Filter Bar */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  padding: var(--space-md);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  animation: slideDown 0.3s ease;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.active-filter {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 6px 12px;
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 500;
  animation: popIn 0.2s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes popIn {
  0% {
    opacity: 0;
    transform: scale(0.8);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

.clear-filter {
  background: none;
  border: none;
  color: white;
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  padding: 0 4px;
  transition: transform var(--transition-fast);
}

.clear-filter:hover {
  transform: scale(1.2);
}

.clear-filter:active {
  transform: scale(0.9);
}

/* ========================================================
   ARTICLE MEDIA (Images, Videos, Embeds)
======================================================== */

/* Images with beautiful hover effect */
.article-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  margin: var(--space-xl) auto;
  display: block;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08), 0 0 0 1px var(--color-border);
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  cursor: zoom-in;
}

.article-content img:hover {
  /* Harmonize with video hover strength for consistency */
  transform: translateY(-2px) scale(1.01);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.12), 0 0 0 1px var(--color-primary);
}

.article-content img:active {
  transform: translateY(-2px) scale(1.01);
  transition: all 0.1s ease;
}

/* Videos */
.article-content video {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  margin: var(--space-xl) auto;
  display: block;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08), 0 0 0 1px var(--color-border);
  transition: all var(--transition-base);
  cursor: pointer;
}

.article-content video:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15), 0 0 0 1px var(--color-primary);
}

/* Responsive iframe container (YouTube, Vimeo, etc) */
.article-content iframe {
  max-width: 100%;
  border: none;
  border-radius: var(--radius-lg);
  margin: var(--space-xl) auto;
  display: block;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08), 0 0 0 1px var(--color-border);
}

/* Video wrapper for 16:9 embeds */
.video-wrapper,
.article-content .embed-responsive,
.video-embed {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  margin: var(--space-xl) auto;
  max-width: 100%;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  transition: all var(--transition-base);
  background: transparent; /* ensure no light band from wrapper */
}

.video-wrapper:hover,
.article-content .embed-responsive:hover,
.video-embed:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.12);
}

.video-wrapper iframe,
.video-wrapper video,
.article-content .embed-responsive iframe,
.video-embed iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
  border-radius: var(--radius-lg);
  background: transparent; /* prevent any player background showing at edges */
}

/* Twitter embeds */
.article-content .twitter-tweet {
  margin: var(--space-xl) auto !important;
  max-width: 550px !important;
}

/* CodePen embeds */
.article-content .cp_embed_wrapper {
  margin: var(--space-xl) auto;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

/* GitHub Gists */
.article-content .gist {
  margin: var(--space-xl) auto;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.article-content .gist .gist-file {
  border-radius: var(--radius-lg) !important;
}

/* Figma embeds */
.article-content iframe[src*="figma.com"] {
  min-height: 600px;
}

/* Image captions */
.article-content figure {
  margin: var(--space-xl) 0;
}

.article-content figcaption {
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-sm);
  font-style: italic;
}

/* Callouts (::: info|success|warning|error) */
.callout {
  margin: var(--space-xl) 0;
  padding: var(--space-lg) var(--space-xl);
  border-left: 4px solid var(--color-primary);
  background: var(--color-primary-light);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}
.callout > *:first-child { margin-top: 0; }
.callout > *:last-child { margin-bottom: 0; }
.callout-info {
  border-color: var(--color-info);
  background: color-mix(in srgb, var(--color-info) 12%, transparent);
}
.callout-success {
  border-color: var(--color-success);
  background: color-mix(in srgb, var(--color-success) 12%, transparent);
}
.callout-warning {
  border-color: var(--color-warning);
  background: color-mix(in srgb, var(--color-warning) 12%, transparent);
}
.callout-error {
  border-color: var(--color-error);
  background: color-mix(in srgb, var(--color-error) 12%, transparent);
}

/* Tables */
.table-wrapper {
  overflow-x: auto;
  margin: var(--space-xl) 0;
  border-radius: var(--radius-lg);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
  background: var(--color-surface);
}

.article-content table thead {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.article-content table th,
.article-content table td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.article-content table th {
  font-weight: 600;
  text-transform: uppercase;
  font-size: var(--font-size-xs);
  letter-spacing: 0.5px;
}

.article-content table tbody tr:hover {
  background: var(--color-surface-hover);
}

.article-content table tbody tr:last-child td {
  border-bottom: none;
}

.post-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

.post-card-meta:empty {
  display: none;
}

/* Loading States */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-4xl) 0;
  color: var(--color-text-secondary);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: var(--space-md);
}

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

/* Skeleton Loading */
.skeleton-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  animation: pulse 1.5s ease-in-out infinite;
}

.skeleton-image {
  width: 100%;
  height: 200px;
  background: linear-gradient(90deg, var(--color-surface) 0%, var(--color-surface-hover) 50%, var(--color-surface) 100%);
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
}

.skeleton-content {
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.skeleton-title {
  height: 28px;
  width: 70%;
  background: linear-gradient(90deg, var(--color-surface-hover) 0%, var(--color-border) 50%, var(--color-surface-hover) 100%);
  background-size: 200% 100%;
  border-radius: var(--radius-sm);
  animation: shimmer 1.5s ease-in-out infinite;
}

.skeleton-text {
  height: 16px;
  width: 100%;
  background: linear-gradient(90deg, var(--color-surface-hover) 0%, var(--color-border) 50%, var(--color-surface-hover) 100%);
  background-size: 200% 100%;
  border-radius: var(--radius-sm);
  animation: shimmer 1.5s ease-in-out infinite;
}

.skeleton-text:last-child {
  width: 85%;
}

.skeleton-meta {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

.skeleton-tag {
  height: 22px;
  width: 60px;
  background: linear-gradient(90deg, var(--color-surface-hover) 0%, var(--color-border) 50%, var(--color-surface-hover) 100%);
  background-size: 200% 100%;
  border-radius: var(--radius-full);
  animation: shimmer 1.5s ease-in-out infinite;
}

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

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.95; }
}

.no-results {
  text-align: center;
  padding: var(--space-4xl) 0;
  color: var(--color-text-secondary);
}

/* Article Page */
.article-header {
  max-width: var(--reading-width);
  margin: var(--space-2xl) auto var(--space-xl);
  text-align: center;
}

.article-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  margin-bottom: var(--space-lg);
  color: var(--color-text);
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm); /* 8px */
  flex-wrap: wrap;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.article-meta .meta-separator {
  opacity: 0.5;
  user-select: none;
}

.article-meta .chip-tag,
.article-meta .chip-topic {
  font-size: var(--font-size-xs); /* Smaller in meta */
  padding: 4px 12px; /* 4px vertical, 12px horizontal - 8px grid */
}

/* Post tags on post page (legacy - no longer used after refactor) */
.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  justify-content: center;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.article-content {
  max-width: var(--reading-width);
  margin: 0 auto var(--space-xl);
  padding: 0 var(--space-md);
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
}

@media (max-width: 768px) {
  .article-content {
    padding: 0 var(--space-lg);
  }
}

.article-content h1 {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin: var(--space-3xl) 0 var(--space-lg);
  line-height: var(--line-height-tight);
  color: var(--color-text);
  scroll-margin-top: calc(var(--nav-height) + var(--space-md));
}

.article-content h1:first-child {
  margin-top: 0;
}

.article-content h2 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin: var(--space-2xl) 0 var(--space-lg);
  line-height: var(--line-height-tight);
  color: var(--color-text);
  scroll-margin-top: calc(var(--nav-height) + var(--space-md));
}

.article-content h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin: var(--space-xl) 0 var(--space-md);
  line-height: var(--line-height-tight);
  color: var(--color-text);
  scroll-margin-top: calc(var(--nav-height) + var(--space-md));
}

.article-content h4 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin: var(--space-lg) 0 var(--space-sm);
  color: var(--color-text);
  scroll-margin-top: calc(var(--nav-height) + var(--space-md));
}

.article-content h5,
.article-content h6 {
  font-size: var(--font-size-md);
  font-weight: 600;
  margin: var(--space-md) 0 var(--space-sm);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  scroll-margin-top: calc(var(--nav-height) + var(--space-md));
}

.article-content p {
  margin-bottom: var(--space-lg);
  color: var(--color-text);
}

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

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

.article-content em,
.article-content i {
  font-style: italic;
}

.article-content a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: all var(--transition-fast);
  position: relative;
}

.article-content a:hover {
  border-bottom-color: var(--color-primary);
  color: var(--color-primary-hover);
}

.article-content a:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Lists */
.article-content ul,
.article-content ol {
  margin: var(--space-lg) 0;
  padding-left: var(--space-xl);
}

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

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

.article-content li {
  margin-bottom: var(--space-sm);
  line-height: var(--line-height-relaxed);
  color: var(--color-text);
}

.article-content li:last-child {
  margin-bottom: 0;
}

.article-content li > ul,
.article-content li > ol {
  margin-top: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.article-content ul ul {
  list-style-type: circle;
}

.article-content ul ul ul {
  list-style-type: square;
}

/* Task lists (GitHub-style checkboxes) */
.article-content input[type="checkbox"] {
  margin-right: var(--space-xs);
  vertical-align: middle;
}

.article-content li:has(input[type="checkbox"]) {
  list-style: none;
  margin-left: calc(-1 * var(--space-xl));
  padding-left: var(--space-xl);
}

/* Blockquotes */
/* Modern blockquote design (2024 standard: Apple, Stripe, Vercel pattern) */
.article-content blockquote {
  background: linear-gradient(90deg, var(--color-primary-light) 0%, transparent 100%);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-lg) 0;
  font-style: italic;
  color: var(--color-text-secondary);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  transition: all var(--transition-normal);
}

.article-content blockquote:hover {
  background: linear-gradient(90deg, var(--color-primary-light) 0%, rgba(0, 122, 255, 0.05) 100%);
  border-color: var(--color-primary);
  transform: translateX(2px);
}

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

.article-content blockquote em {
  color: var(--color-primary);
}

.article-content blockquote p {
  margin-bottom: var(--space-md);
}

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

.article-content blockquote cite,
.article-content blockquote footer {
  display: block;
  margin-top: var(--space-sm);
  font-size: var(--font-size-sm);
  font-style: normal;
  color: var(--color-text-tertiary);
}

.article-content blockquote cite::before {
  content: "— ";
}

/* Horizontal rule */
.article-content hr {
  margin: var(--space-2xl) 0;
  border: none;
  border-top: 2px solid var(--color-border);
  opacity: 0.5;
}

/* Inline code */
.article-content code {
  padding: 2px 6px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.9em;
}

.article-content pre {
  padding: var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  margin: var(--space-xl) 0;
  position: relative;
}

.article-content pre code {
  padding: 0;
  background: none;
  color: inherit;
}

.code-copy-btn {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-sm);
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: var(--font-size-xs);
  font-family: var(--font-mono);
  cursor: pointer;
  transition: all var(--transition-fast);
  opacity: 0;
  z-index: 10;
  pointer-events: auto;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  min-height: 28px;
}

.code-copy-btn svg {
  flex-shrink: 0;
}

/* Desktop: show on hover */
@media (hover: hover) and (pointer: fine) {
  .article-content pre:hover .code-copy-btn,
  .code-copy-btn:focus {
    opacity: 1;
  }
}

/* Mobile/Touch: always visible but subtle */
@media (hover: none) or (pointer: coarse) {
  .code-copy-btn {
    opacity: 0.7;
    position: absolute;
    top: var(--space-sm);
    right: var(--space-sm);
  }
  
  .code-copy-btn:active {
    opacity: 1;
    transform: scale(0.95);
  }
}

.code-copy-btn:hover {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(0, 122, 255, 0.3);
}

.code-copy-btn.copied {
  background: var(--color-success);
  color: white;
  border-color: var(--color-success);
}

/* ========================================
   FOOTER - MOBILE-OPTIMIZED
======================================== */

/* FIX: Screenshot shows footer links unreadable on mobile, poor wrapping
 * RESEARCH: Apple HIG requires 44pt touch targets, Gestalt grouping principle for visual hierarchy
 * PSYCHOLOGY: Proper spacing reduces cognitive load, clear tap areas increase confidence
 * SOLUTION: Card-based mobile layout, 48px touch targets, better contrast */

.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-3xl) 0 var(--space-2xl);
  margin-top: var(--space-3xl);
}

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

/* Center columns when Connect is hidden */
.footer-content.footer-centered {
  justify-items: center;
  grid-template-columns: repeat(auto-fit, minmax(280px, 420px));
}
.footer-content.footer-centered > * { width: 100%; max-width: 420px; }

.footer h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--color-text); /* Ensure high contrast */
}

.footer-about p {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  
  /* Truncate long author bios */
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
}

.footer-links ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  max-height: 300px;
  overflow-y: auto;
  overflow-x: hidden;
}

.footer-links li {
  min-height: 44px; /* Touch target accessibility */
  display: flex;
  align-items: center;
}

/* Social links: Show first 8, scroll if more */
#social-links {
  max-height: 250px;
}

/* Scrollbar styling for social links */
#social-links::-webkit-scrollbar {
  width: 4px;
}

#social-links::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 2px;
}

#social-links::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-tertiary);
}

.footer-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  min-height: 44px; /* Touch target */
  padding: var(--space-xs) 0;
  width: 100%;
}

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

.footer-links a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.footer-bottom {
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* Mobile: Card-based layout for better readability */
@media (max-width: 768px) {
  .footer {
    padding: var(--space-2xl) 0 var(--space-xl);
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
  
  .footer-about,
  .footer-links {
    padding: var(--space-lg);
    background: var(--color-background);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
  }
  
  .footer h3 {
    font-size: var(--font-size-md);
    margin-bottom: var(--space-sm);
  }
  
  .footer-links a {
    min-height: 48px; /* Larger mobile touch target */
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
  }
  
  .footer-links a:active {
    background: var(--color-primary-light);
    transform: translateX(6px);
  }
  
  .footer-bottom {
    padding: var(--space-lg) var(--space-md);
    font-size: var(--font-size-xs);
  }
}

/* Toast Notifications */
.toast {
  position: fixed;
  bottom: -100px;
  left: 50%;
  transform: translateX(-50%);
  padding: 14px 24px;
  font-size: 14px;
  font-weight: 500;
  z-index: var(--z-tooltip);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 8px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

@media (prefers-color-scheme: light) {
  .toast {
    background: rgba(0, 0, 0, 0.85);
    color: #ffffff;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
  }
}

@media (prefers-color-scheme: dark) {
  .toast {
    background: rgba(255, 255, 255, 0.15);
    color: #ffffff;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
  }
}

.toast.show {
  bottom: 32px;
  opacity: 1;
}

/* Utility Classes */
.hidden {
  display: none !important;
}

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

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

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 12px;
  height: 12px;
}

::-webkit-scrollbar-track {
  background: var(--color-surface);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 6px;
  border: 2px solid var(--color-surface);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-tertiary);
}

/* Firefox scrollbar */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) var(--color-surface);
}

/* ========================================
   LISTING PAGES (TAG / TOPIC)
======================================== */

.listing-header {
  padding: var(--space-3xl) 0 var(--space-2xl);
  border-bottom: 1px solid var(--color-border);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-lg);
  transition: color var(--transition-fast);
}

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

.listing-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.listing-title .chip {
  font-size: var(--font-size-lg);
  padding: 0.625rem 1rem;
}

.listing-count {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
}

/* ========================================
   ADAPTIVE SPACING (FEATURE FLAGS)
======================================== */

/* When images are off */
html[data-images="off"] .post-card-media {
  display: none;
}

html[data-images="off"] .post-card {
  min-height: auto;
}

/* When excerpts are off */
html[data-excerpts="off"] .post-card-excerpt {
  display: none;
}

html[data-excerpts="off"] .post-card-content {
  gap: var(--space-xs);
}

/* When date is off */
html[data-date="off"] .meta-date {
  display: none;
}

html[data-date="off"] .meta-sep {
  display: none;
}

/* When reading time is off */
html[data-readingtime="off"] .meta-read {
  display: none;
}

/* When tags are off */
html[data-tags="off"] .chip-tag {
  display: none;
}

/* When topics are off */
html[data-topics="off"] .chip-topic {
  display: none;
}

/* When both tags and topics are off */
html[data-tags="off"][data-topics="off"] .post-card-chips {
  display: none;
}

html[data-tags="off"][data-topics="off"] .post-card-content {
  gap: var(--space-md);
}

/* When progress bar is off */
html[data-progressbar="off"] .progress-bar {
  display: none;
}

/* When skeleton loading is off */
html[data-skeleton="off"] .loading {
  display: none;
}

/* Grid responsiveness */
@media (max-width: 640px) {
  .posts-grid {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 641px) and (max-width: 1024px) {
  .posts-grid {
    grid-template-columns: repeat(auto-fill, minmax(var(--card-min, 288px), 1fr));
  }
}

@media (min-width: 1025px) {
  .posts-grid {
    grid-template-columns: repeat(auto-fill, minmax(var(--card-min, 288px), 1fr));
  }
}

/* ========================================
   SEARCH PILLS - PERFECT IMPLEMENTATION
======================================== */

/* Pills container - horizontal scroll */
.search-pills-container {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  overflow-x: auto;
  /* Allow vertical overflow so hover lift/glow never clips */
  overflow-y: visible;
  flex: 0 1 auto; /* size to content; input gets remaining space */
  min-width: 0;
  white-space: nowrap;
  margin-left: 16px;
  padding-right: 8px; /* small breathing room near Close button */
  scroll-behavior: smooth;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

/* Ensure the very first pill never hugs the container edge */
.search-pills-container .search-pill:first-child { margin-left: 2px; }

/* When there are no pills, remove the lane entirely so the input occupies full width */
.search-pills-container:empty { display: none; }

/* Input sizing rules tied to pill presence so start/end align with text */
.search-pills-container:empty + #searchInput {
  flex: 1 1 auto;
  min-width: 0;
}
.search-pills-container.has-pills + #searchInput {
  flex: 1 1 auto; /* input always flexes; lane determines visible start */
  min-width: 0;
}
.search-pills-container::-webkit-scrollbar {
  display: none;
}

/* FIX: Screenshot shows weird glow/box on pill hover
 * RESEARCH: Material Design - elevation should be subtle, not jarring
 * PSYCHOLOGY: Predictable hover states build trust (Norman, 2013)
 * SOLUTION: Single definition, clean shadow, X button appears on hover */

.search-pill {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-primary);
  color: white;
  height: 32px;
  padding: 0 30px 0 12px; /* Right padding for X button */
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 500;
  line-height: 1;
  white-space: nowrap;
  flex-shrink: 0;
  cursor: default; /* Pill itself not clickable, X button is */
  border: none;
  user-select: none;
  transition: box-shadow 0.2s ease;
}

/* X button - absolute positioned to avoid layout shift */
.search-pill-remove {
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  opacity: 0;
  pointer-events: none;
  padding: 0;
}

.search-pill-remove svg {
  width: 10px;
  height: 10px;
  stroke-width: 2.5;
  color: white;
}

.search-pill-remove:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: translateY(-50%) scale(1.1);
}

.search-pill-remove:active {
  transform: translateY(-50%) scale(0.9);
}

/* Slide-in animation for delete button */
@keyframes slideInX {
  from {
    opacity: 0;
    transform: translateX(8px) scale(0.8);
  }
  to {
    opacity: 1;
    transform: translateY(-50%) scale(1);
  }
}

@keyframes slideOutX {
  from {
    opacity: 1;
    transform: translateY(-50%) scale(1);
  }
  to {
    opacity: 0;
    transform: translateX(8px) scale(0.8);
  }
}

/* Show X on hover (desktop) with smooth slide-in */
@media (hover: hover) and (pointer: fine) {
  .search-pill:hover {
    box-shadow: 0 4px 12px rgba(0, 122, 255, 0.25);
  }
  .search-pill:hover .search-pill-remove {
    opacity: 1;
    pointer-events: auto;
    animation: slideInX 0.2s cubic-bezier(0.4, 0, 0.2, 1) forwards;
  }
}

/* Always show X on touch devices */
@media (hover: none), (pointer: coarse) {
  .search-pill-remove {
    opacity: 1;
    pointer-events: auto;
  }
}

/* Visual indicator for active pills (shown in search results) */
.search-pill.active::after {
  content: ' ✓';
  color: rgba(255, 255, 255, 0.9);
  font-weight: 700;
  font-size: 14px;
  margin-left: 4px;
}

/* Remove animation for adding pills */
.search-pill.removing {
  opacity: 0;
  transform: scale(0.8);
  transition: all 0.16s ease-out;
}

/* Long-press feedback (mobile) */
.search-pill.long-pressed {
  background: var(--color-error);
  color: white;
  transform: scale(0.95);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 12px rgba(255, 59, 48, 0.4);
}

/* OBVIOUS colored pills for #tag (pink) and @topic (purple) - SOLID single colors like Raycast */
.search-pill-tag {
  background: #EC4899 !important;
  color: white !important;
  border: none !important;
  box-shadow: 0 2px 8px rgba(236, 72, 153, 0.3);
}

.search-pill-tag:hover {
  background: #DB2777 !important; /* Slightly darker on hover */
  box-shadow: 0 4px 12px rgba(236, 72, 153, 0.4);
}

.search-pill-topic {
  background: #8B5CF6 !important;
  color: white !important;
  border: none !important;
  box-shadow: 0 2px 8px rgba(139, 92, 246, 0.3);
}

.search-pill-topic:hover {
  background: #7C3AED !important; /* Slightly darker on hover */
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.4);
}

/* Ensure X button is white on colored pills */
.search-pill-tag .search-pill-remove,
.search-pill-topic .search-pill-remove {
  background: rgba(255, 255, 255, 0.2);
  color: white;
}

.search-pill-tag .search-pill-remove:hover,
.search-pill-topic .search-pill-remove:hover {
  background: rgba(255, 255, 255, 0.3);
}


/* ========================================
   PRINT STYLES
======================================== */

@media print {
  /* Hide non-essential elements */
  .nav,
  .search-overlay,
  .skip-link,
  .progress-bar,
  .toast,
  .btn-icon,
  .search-shortcut,
  .chip,
  .footer,
  .back-link,
  button {
    display: none !important;
  }
  
  /* Reset colors for print */
  * {
    color: #000 !important;
    background: #fff !important;
    box-shadow: none !important;
  }
  
  /* Optimize typography */
  body {
    font-size: 12pt;
    line-height: 1.6;
  }
  
  h1 { font-size: 24pt; margin-bottom: 12pt; }
  h2 { font-size: 18pt; margin-top: 16pt; margin-bottom: 8pt; }
  h3 { font-size: 14pt; margin-top: 12pt; margin-bottom: 6pt; }
  
  /* Show URLs for links */
  a[href]:after {
    content: " (" attr(href) ")";
    font-size: 10pt;
    color: #666 !important;
  }
  
  a[href^="#"]:after,
  a[href^="javascript:"]:after {
    content: "";
  }
  
  /* Prevent page breaks inside elements */
  pre,
  blockquote,
  img,
  figure {
    page-break-inside: avoid;
  }
  
  h1, h2, h3, h4, h5, h6 {
    page-break-after: avoid;
  }
  
  /* Code blocks */
  pre, code {
    border: 1px solid #ddd !important;
    padding: 8pt !important;
    font-size: 10pt !important;
    font-family: monospace !important;
    white-space: pre-wrap !important;
    word-wrap: break-word !important;
  }
  
  /* Images */
  img {
    max-width: 100% !important;
    height: auto !important;
  }
  
  /* Article content */
  .article-content,
  .post-card-content {
    max-width: 100% !important;
  }
  
  /* Post cards in list view */
  .post-card {
    border: 1px solid #ddd !important;
    padding: 12pt !important;
    margin-bottom: 12pt !important;
    page-break-inside: avoid;
  }
  
  .post-card-title {
    font-size: 14pt !important;
    margin-bottom: 6pt !important;
  }
  
  /* Hide media in print for post cards (optional) */
  .post-card-media {
    display: none !important;
  }
}

/* ========================================
   TABLE OF CONTENTS
======================================== */

.toc-container {
  position: sticky;
  top: calc(var(--nav-height) + var(--space-lg));
  float: right;
  width: 240px;
  max-height: calc(100vh - var(--nav-height) - var(--space-xl) * 2);
  overflow-y: auto;
  margin-left: var(--space-xl);
  margin-bottom: var(--space-xl);
  padding: var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  display: none;
}

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

.toc-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.toc-link {
  display: block;
  padding: var(--space-xs) var(--space-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: all var(--transition-fast);
  line-height: var(--line-height-normal);
  
  /* Smart truncation with ellipsis */
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 100%;
  cursor: help;
}

.toc-link:hover {
  color: var(--color-primary);
  background: var(--color-primary-light);
  border-left-color: var(--color-primary);
}

.toc-link.active {
  color: var(--color-primary);
  font-weight: 500;
  background: var(--color-primary-light);
  border-left-color: var(--color-primary);
}

.toc-link-nested {
  padding-left: var(--space-lg);
  font-size: 0.9em;
}

/* Smaller nested links on constrained screens */
@media (max-width: 1280px) {
  .toc-link-nested {
    padding-left: var(--space-md);
    font-size: 0.85em;
  }
}

/* Hide TOC on smaller screens */
@media (max-width: 1200px) {
  .toc-container {
    display: none !important;
  }
}

/* ========================================
   RELATED POSTS
======================================== */

.related-posts-container {
  padding: var(--space-4xl) 0;
  background: var(--color-surface);
  display: none;
}

.related-posts-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-xl);
  text-align: center;
}

/* FIX: Awkward gaps when fewer than full row
 * RESEARCH: CSS Grid auto-fit behavior can create visual imbalance
 * PSYCHOLOGY: Empty space signals "something missing" (Gestalt completion)
 * SOLUTION: Smart grid that adapts to actual count, centers when <3 posts */

.related-posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
  max-width: 1200px;
  margin: 0 auto;
}

/* When only 1-2 posts, center them with max-width */
.related-posts-grid:has(.related-post-card:nth-child(1)):not(:has(.related-post-card:nth-child(3))) {
  grid-template-columns: repeat(auto-fit, minmax(280px, 400px));
  justify-content: center;
}

/* Single post: center and constrain */
.related-posts-grid:has(.related-post-card:only-child) {
  max-width: 450px;
}

.related-post-card {
  display: flex;
  flex-direction: column;
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  text-decoration: none;
  transition: all var(--transition-base);
}

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

.related-post-gradient {
  width: 100%;
  height: 140px;
  flex-shrink: 0;
}

.related-post-content {
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.related-post-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  line-height: var(--line-height-tight);
  margin: 0;
}

.related-post-excerpt {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-normal);
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.related-post-meta {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  margin-top: auto;
}

@media (max-width: 768px) {
  .related-posts-grid {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   FEATURED POSTS
======================================== */

.featured-posts-section {
  padding: var(--space-4xl) 0 var(--space-2xl);
  display: none;
}

.featured-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-xl);
  text-align: center;
}

.featured-posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-xl);
}

.featured-post-card {
  display: flex;
  flex-direction: column;
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  text-decoration: none;
  transition: all var(--transition-base);
  position: relative;
}

.featured-post-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.featured-post-media {
  width: 100%;
  height: 200px;
  position: relative;
  overflow: hidden;
}

.featured-post-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.featured-post-gradient {
  width: 100%;
  height: 100%;
}

.featured-post-content {
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.featured-badge {
  display: inline-block;
  width: fit-content;
  padding: var(--space-2xs) var(--space-sm);
  background: var(--color-primary);
  color: white;
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-sm);
}

.featured-post-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
  line-height: var(--line-height-tight);
  margin: 0;
}

.featured-post-excerpt {
  font-size: var(--font-size-md);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.featured-post-meta {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  margin-top: auto;
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
}

@media (max-width: 768px) {
  .featured-posts-grid {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   GISCUS COMMENTS
======================================== */

.giscus-container {
  padding: var(--space-4xl) 0;
  display: none;
}

.giscus-container .container {
  max-width: 65ch;
}

.giscus {
  width: 100%;
}

/* Style Giscus iframe for better integration */
.giscus-frame {
  width: 100%;
  border: none;
  color-scheme: auto;
}

/* ========================================
   BACK LINK
======================================== */

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-surface);
  color: var(--color-text);
  text-decoration: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-md);
  font-weight: 500;
  transition: all var(--transition-fast);
  min-height: 44px;
  min-width: 44px;
  margin: 0 auto;
}

.back-link:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateX(-2px);
}

.back-link svg {
  flex-shrink: 0;
}

@media (max-width: 768px) {
  .back-link {
    width: 100%;
    justify-content: center;
  }
}

/* ========================================
   BACK TO TOP BUTTON
======================================== */

.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 999;
  width: 48px;
  height: 48px;
  min-width: 44px;
  min-height: 44px;
  border: none;
  border-radius: 50%;
  background: var(--color-primary);
  color: white;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.back-to-top:active {
  transform: translateY(0);
}

@media (max-width: 768px) {
  .back-to-top {
    bottom: 1rem;
    right: 1rem;
    width: 44px;
    height: 44px;
  }
}

/* ========================================
   PROGRESS PERCENTAGE INDICATOR
======================================== */

/* FIX: Blue glow bug on scroll - progress percentage had distracting shadow
 * WHY: Subtle indicator, not attention-grabbing
 * SOLUTION: Minimal shadow, slight transparency for non-intrusiveness */
.progress-percentage {
  position: fixed;
  top: calc(var(--header-height) + 4px);
  right: 1rem;
  z-index: 999;
  padding: 0.25rem 0.75rem;
  background: var(--color-primary);
  color: white;
  font-size: var(--font-size-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08); /* Subtle - no blue glow */
  transition: opacity var(--transition-base);
  pointer-events: none;
  user-select: none;
  opacity: 0.9; /* Slightly transparent to be less distracting */
}

[data-theme="dark"] .progress-percentage {
  background: var(--color-primary);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2); /* Subtle in dark mode too */
  opacity: 0.85; /* Even more subtle in dark mode */
}

@media (max-width: 768px) {
  .progress-percentage {
    font-size: 10px;
    padding: 0.2rem 0.5rem;
    right: 0.5rem;
  }
}

/* ========================================
   SOCIAL SHARING - MATERIAL DESIGN ALIGNED
======================================== */

/* FIX: Screenshot shows share buttons misaligning at small widths and dark mode
 * RESEARCH: Material Design 3 grid system (4px base), Apple HIG 8pt grid
 * PSYCHOLOGY: Gestalt proximity principle for grouping, consistent spacing reduces cognitive load
 * SOLUTION: Grid-snapped layout, proper contrast, responsive wrapping */

.social-share {
  display: flex;
  align-items: center;
  justify-content: center; /* Center align */
  gap: var(--space-md); /* 16px */
  margin-top: var(--space-lg); /* 24px below meta - 8px grid */
  flex-wrap: wrap;
}

.share-label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text); /* Higher contrast */
  margin-right: var(--space-sm);
  min-width: fit-content; /* Never wrap mid-word */
}

.btn-share,
.btn-share-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  border: 2px solid var(--color-border); /* Thicker border for visibility */
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1); /* Material easing */
  min-height: 44px; /* Touch target */
  min-width: 44px;
  flex-shrink: 0;
}

.btn-share:hover,
.btn-share-icon:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 4px 12px rgba(0, 122, 255, 0.25);
}

.btn-share:active,
.btn-share-icon:active {
  transform: translateY(0) scale(1);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.btn-share:focus-visible,
.btn-share-icon:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

.btn-share svg,
.btn-share-icon svg {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
}

.btn-share-icon {
  padding: var(--space-sm);
}

@media (max-width: 640px) {
  .social-share {
    gap: var(--space-sm);
    justify-content: flex-start; /* Left-align on mobile */
  }
  
  .btn-share span {
    display: none; /* Icon-only on mobile */
  }
  
  .btn-share,
  .btn-share-icon {
    min-height: 48px; /* Larger mobile touch target */
    min-width: 48px;
    padding: var(--space-md);
  }
}

/* ========================================
   PRINT STYLES
======================================== */

@media print {
  /* Reset and optimization */
  * {
    background: transparent !important;
    color: black !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }
  
  /* Hide non-essential elements */
  .header,
  .nav,
  .search-overlay,
  .search-box,
  .search-btn,
  .back-to-top,
  .social-share,
  .giscus-container,
  .related-posts-container,
  .footer,
  .progress-bar-container,
  .progress-percentage,
  .toc-container,
  .btn-share,
  .btn-share-icon,
  .code-copy-btn,
  button,
  .chip {
    display: none !important;
  }
  
  /* Optimize page layout */
  body {
    font-size: 12pt;
    line-height: 1.5;
    max-width: 100%;
    margin: 0;
    padding: 0;
  }
  
  /* Typography for print */
  h1 {
    font-size: 24pt;
    page-break-after: avoid;
  }
  
  h2 {
    font-size: 18pt;
    page-break-after: avoid;
    margin-top: 1.5em;
  }
  
  h3 {
    font-size: 14pt;
    page-break-after: avoid;
  }
  
  /* Article content */
  .article-header {
    border-bottom: 2px solid #000;
    padding-bottom: 1em;
    margin-bottom: 1.5em;
  }
  
  .article-title {
    font-size: 24pt;
    font-weight: bold;
  }
  
  .article-meta {
    font-size: 10pt;
    color: #666;
  }
  
  .article-content {
    max-width: 100%;
  }
  
  .article-content p,
  .article-content li {
    orphans: 3;
    widows: 3;
  }
  
  .article-content h2,
  .article-content h3 {
    page-break-after: avoid;
  }
  
  /* Code blocks */
  pre,
  code {
    border: 1px solid #ccc;
    page-break-inside: avoid;
    font-size: 9pt;
    white-space: pre-wrap;
    word-wrap: break-word;
  }
  
  /* Images */
  img {
    max-width: 100% !important;
    page-break-inside: avoid;
  }
  
  /* Links - show URLs */
  a[href^="http"]:after {
    content: " (" attr(href) ")";
    font-size: 9pt;
    color: #666;
  }
  
  a[href^="#"]:after,
  a[href^="javascript:"]:after {
    content: "";
  }
  
  /* Tables */
  table {
    border-collapse: collapse;
    page-break-inside: avoid;
    font-size: 10pt;
  }
  
  th, td {
    border: 1px solid #ddd;
    padding: 6px;
  }
  
  /* Page breaks */
  .post-card,
  blockquote {
    page-break-inside: avoid;
  }
  
  /* Add page numbers */
  @page {
    margin: 2cm;
  }
  
  @page :first {
    margin-top: 1cm;
  }
}

/* ========================================
   KEYBOARD SHORTCUTS MODAL
======================================== */

.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.75);
  z-index: 10000;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
  animation: fadeIn 0.2s ease-out;
}

.modal-overlay.active {
  display: flex;
}

.keyboard-shortcuts-modal {
  background: var(--color-background);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  max-width: 600px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  animation: slideUp 0.3s ease-out;
}

[data-theme="dark"] .keyboard-shortcuts-modal {
  background: var(--color-surface);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.modal-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
  margin: 0;
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--color-text-secondary);
  font-size: var(--font-size-xl);
  cursor: pointer;
  padding: var(--space-xs);
  line-height: 1;
  transition: color var(--transition-fast);
}

.modal-close:hover {
  color: var(--color-text);
}

.shortcuts-section {
  margin-bottom: var(--space-lg);
}

.shortcuts-section:last-child {
  margin-bottom: 0;
}

.shortcuts-section h3 {
  font-size: var(--font-size-md);
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 var(--space-md) 0;
}

.shortcut-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) 0;
}

.shortcut-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.shortcut-keys {
  display: flex;
  gap: var(--space-xs);
}

.key {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.25rem 0.5rem;
  font-size: var(--font-size-xs);
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--color-text);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  min-width: 2rem;
  text-align: center;
}

[data-theme="dark"] .key {
  background: var(--color-background);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

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

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 640px) {
  .keyboard-shortcuts-modal {
    width: 95%;
    padding: var(--space-lg);
    max-height: 90vh;
  }
  
  .modal-title {
    font-size: var(--font-size-lg);
  }
  
  .shortcut-row {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-xs);
  }
}

/* ========================================
   IMAGE LIGHTBOX
======================================== */

.lightbox-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.95);
  z-index: 10001;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.2s ease-out;
}

.lightbox-overlay.active {
  display: flex;
}

.lightbox-content {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-image {
  max-width: 100%;
  max-height: 90vh;
  object-fit: contain;
  border-radius: var(--radius-md);
  animation: zoomIn 0.3s ease-out;
}

.lightbox-close {
  position: fixed;
  top: 1rem;
  right: 1rem;
  background: rgba(255, 255, 255, 0.1);
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-full);
  color: white;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: var(--font-size-xl);
  font-weight: 700;
  transition: all var(--transition-fast);
  backdrop-filter: blur(8px);
  z-index: 10002;
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.5);
  transform: scale(1.1);
}

.lightbox-prev,
.lightbox-next {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.1);
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-full);
  color: white;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: var(--font-size-xl);
  font-weight: 700;
  transition: all var(--transition-fast);
  backdrop-filter: blur(8px);
  z-index: 10002;
}

.lightbox-prev {
  left: 2rem;
}

.lightbox-next {
  right: 2rem;
}

.lightbox-prev:hover,
.lightbox-next:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.5);
  transform: translateY(-50%) scale(1.1);
}

.lightbox-prev:disabled,
.lightbox-next:disabled {
  opacity: 0.3;
  cursor: not-allowed;
  pointer-events: none;
}

.lightbox-caption {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.8);
  color: white;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  max-width: 80%;
  text-align: center;
  backdrop-filter: blur(8px);
}

.lightbox-counter {
  position: fixed;
  top: 1rem;
  left: 1rem;
  background: rgba(0, 0, 0, 0.8);
  color: white;
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 600;
  backdrop-filter: blur(8px);
}

@keyframes zoomIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@media (max-width: 768px) {
  .lightbox-prev,
  .lightbox-next {
    width: 48px;
    height: 48px;
    font-size: var(--font-size-lg);
  }
  
  .lightbox-prev {
    left: 1rem;
  }
  
  .lightbox-next {
    right: 1rem;
  }
  
  .lightbox-close {
    width: 44px;
    height: 44px;
  }
  
  .lightbox-caption {
    max-width: 90%;
    font-size: var(--font-size-xs);
  }
}

/* ========================================
   PAGINATION
======================================== */

.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  margin-top: var(--space-3xl);
  padding: var(--space-lg) 0;
}

.pagination-pages {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  flex-wrap: wrap;
  justify-content: center;
}

/* FIX: Screenshot shows pagination buttons too faint in dark/light mode
 * RESEARCH: WCAG 2.1 AA requires 3:1 contrast for UI components
 * PSYCHOLOGY: High contrast increases confidence in interactions (Fitts' Law)
 * SOLUTION: Stronger borders, clear states, high contrast in all themes */

.pagination-btn,
.pagination-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px; /* Touch target */
  min-height: 44px;
  padding: var(--space-sm) var(--space-md);
  border: 2px solid var(--color-border); /* Thicker for visibility */
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: var(--font-size-md); /* Larger for readability */
  font-weight: 600; /* Stronger weight */
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
}

.pagination-btn:hover:not(:disabled),
.pagination-number:hover:not(.active) {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 122, 255, 0.25);
}

.pagination-btn:active:not(:disabled),
.pagination-number:active:not(.active) {
  transform: translateY(0);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.pagination-btn:focus-visible,
.pagination-number:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

.pagination-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
  border-color: var(--color-border);
}

.pagination-number.active {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
  font-weight: 700;
  box-shadow: 0 2px 8px rgba(0, 122, 255, 0.3);
}

.pagination-ellipsis {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  padding: 0 var(--space-xs);
  color: var(--color-text-secondary);
  font-weight: 600;
  user-select: none;
}

.pagination-info {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: 0 var(--space-md);
  white-space: nowrap;
}

.pagination-btn svg {
  flex-shrink: 0;
}

@media (max-width: 640px) {
  .pagination {
    gap: var(--space-sm);
    margin-top: var(--space-2xl);
  }
  
  .pagination-btn {
    min-width: 48px;
    min-height: 48px;
    padding: var(--space-md);
  }
  
  .pagination-btn span {
    display: none;
  }
}

/* ========================================
   BREADCRUMBS - INTELLIGENT RESPONSIVE
======================================== */

/* FIX: Screenshot shows breadcrumbs overflowing/overlapping at small widths
 * RESEARCH: Fitts' Law requires minimum 44px touch targets, progressive disclosure for space
 * PSYCHOLOGY: Clear navigation hierarchy reduces cognitive load (Miller's Law: 7±2 items)
 * SOLUTION: Intelligent truncation with ellipsis, proper min-heights, flex wrap, no overlap */

/**
 * Breadcrumbs navigation
 * RESEARCH: Nielsen Norman - Breadcrumbs need proper spacing from edges
 * WHY: Touch screens need padding to prevent accidental edge swipes
 * FIX: Added horizontal padding with var(--space-lg)
 */
.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-xs);
  padding: var(--space-md) var(--space-lg);  /* ← FIXED: added horizontal padding */
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
  min-height: 44px;
  max-width: 100%;
  overflow: visible;
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  flex-shrink: 1; /* Allow items to shrink if needed */
  min-width: 0; /* Enable text truncation in flex children */
}

.breadcrumb-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast), transform var(--transition-fast);
  min-height: 44px; /* Touch target */
  display: inline-flex;
  align-items: center;
  padding: var(--space-xs) var(--space-sm); /* Increase tap area */
  border-radius: var(--radius-sm);
  max-width: 100%; /* Respect parent constraints */
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.breadcrumb-link:hover {
  color: var(--color-primary);
  background: var(--color-primary-light);
  transform: translateX(2px);
}

.breadcrumb-link:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.breadcrumb-separator {
  color: var(--color-text-tertiary);
  user-select: none;
  padding: 0 0.25rem;
  flex-shrink: 0; /* Never shrink separators */
}

.breadcrumb-current {
  color: var(--color-text);
  font-weight: 500;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding: var(--space-xs) var(--space-sm);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

/* Tablet: Moderate truncation */
@media (max-width: 1024px) {
  .breadcrumb-item:not(:first-child):not(:last-child) .breadcrumb-link {
    max-width: 150px;
  }
  
  .breadcrumb-current {
    max-width: 250px;
  }
}

/* Mobile: Aggressive but readable truncation */
@media (max-width: 640px) {
  .breadcrumbs {
    font-size: var(--font-size-xs);
    gap: 0.25rem;
    padding: var(--space-sm) 0;
  }
  
  .breadcrumb-link {
    min-height: 48px; /* Larger touch target on mobile */
    padding: var(--space-sm);
  }
  
  /* Home link stays full */
  .breadcrumb-item:first-child .breadcrumb-link {
    max-width: none;
  }
  
  /* Middle breadcrumb: tight truncation */
  .breadcrumb-item:not(:first-child):not(:last-child) .breadcrumb-link {
    max-width: 80px;
  }
  
  /* Current page: readable but constrained */
  .breadcrumb-current {
    max-width: 180px;
    min-height: 48px;
  }
  
  .breadcrumb-separator {
    padding: 0 0.125rem;
  }
}

/* Prevent breadcrumbs from overlapping with back button or other elements */
.breadcrumbs + .back-link,
.breadcrumbs + .article-header {
  margin-top: var(--space-md); /* Ensure spacing */
}