/* ==========================================================================
   PLU v3.0 - LEXIKON PAGE STYLES
   Premium CSS following ITCSS + BEM methodology
   File: css/04-pages/lexikon.css
   
   ITCSS Layer: 04 - Pages (Page-specific styles)
   
   Sections:
   1. Editorial Lead Section
   2. Search & Filter
   3. Quick Start Grid
   4. Alphabet Navigation
   5. Lexikon Sections (A-Z)
   6. No Results State
   7. Stats Component
   8. Responsive Adaptations
   ========================================================================== */

/* ==========================================================================
   1. EDITORIAL LEAD SECTION
   Academic-style introduction with hierarchical typography
   ========================================================================== */

.editorial-section {
  padding: var(--space-10) 0;
  position: relative;
}

/**
 * Editorial Content Card
 * Premium card design with gradient accent
 */
.editorial-content {
  background: linear-gradient(
    135deg,
    rgba(88, 166, 255, 0.08) 0%,
    rgba(139, 92, 246, 0.04) 50%,
    rgba(30, 41, 59, 0.3) 100%
  );
  border: 1px solid rgba(88, 166, 255, 0.15);
  border-radius: var(--radius-2xl);
  padding: var(--space-8) var(--space-6);
  position: relative;
  overflow: hidden;
  max-width: 800px;
  margin: 0 auto;
}

.editorial-content::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-cyan));
}

.editorial-content::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(88, 166, 255, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

@media (min-width: 768px) {
  .editorial-content {
    padding: var(--space-10) var(--space-8);
  }
}

.editorial-lead {
  font-size: var(--text-xl);
  line-height: var(--leading-relaxed);
  color: var(--text-secondary);
  margin-bottom: var(--space-6);
  position: relative;
  z-index: 1;
}

.editorial-lead strong {
  color: var(--text-primary);
  font-weight: var(--font-bold);
}

.editorial-body {
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
  position: relative;
  z-index: 1;
}

.editorial-body strong {
  color: var(--text-primary);
  font-weight: var(--font-semibold);
}

/* ==========================================================================
   2. SEARCH & FILTER
   Interactive search and category filtering
   ========================================================================== */

/**
 * Lexikon Search Wrapper
 * Centered search section
 */
.lexikon-search {
  margin-top: 0;
  margin-bottom: var(--space-6);
}

/**
 * Search Container
 * Full-width search with premium styling
 */
.search-container {
  max-width: 600px;
  margin: 0 auto;
  position: relative;
  display: flex;
  align-items: center;
}

.search-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: var(--space-4);
  color: var(--text-tertiary);
  font-size: var(--text-xl);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: var(--space-4) var(--space-20) var(--space-4) var(--space-12);
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  color: var(--text-primary);
  font-size: var(--text-base);
  transition: all var(--duration-300) var(--ease-out);
}

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

.search-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-primary-glow);
}

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

.search-clear {
  position: absolute;
  right: var(--space-4);
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  padding: var(--space-1);
  display: none;
  align-items: center;
  justify-content: center;
}

.search-clear.visible {
  display: flex;
}

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

/**
 * Search Shortcut (⌘K)
 * Keyboard shortcut indicator
 */
.search-shortcut {
  position: absolute;
  right: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-1);
  pointer-events: none;
}

.search-shortcut kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-1) var(--space-2);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--text-tertiary);
  min-width: 24px;
  height: 24px;
}

/**
 * Category Filter Chips
 * Horizontal scrollable category filters
 */
.category-filter {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
  flex-wrap: wrap;
  justify-content: center;
}

.category-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  cursor: pointer;
  transition: all var(--duration-300) var(--ease-out);
}

.category-chip:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.category-chip.active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: white;
}

.category-chip i {
  font-size: var(--text-base);
}

/* ==========================================================================
   3. QUICK START - NEW DESIGN (Vertical Featured Cards)
   Top 8 terms displayed as full-width expandable cards
   ========================================================================== */

.quick-start-header {
  text-align: center;
  margin-bottom: var(--space-10);
  padding: 0 var(--space-4);
}

.quick-start-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-cyan));
  color: white;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: var(--font-bold);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--space-5);
  box-shadow: 0 4px 20px rgba(88, 166, 255, 0.3);
}

.gradient-text-accent {
  background: linear-gradient(135deg, #f59e0b, #ec4899);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.quick-start-lead {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: 640px;
  margin: var(--space-4) auto 0;
  line-height: var(--leading-relaxed);
}

.quick-start-terms {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  margin-bottom: var(--space-10);
}

.quick-start-footer {
  text-align: center;
  padding-top: var(--space-4);
}

/* Featured Term Cards */
.term-card--featured {
  position: relative;
  border: 2px solid var(--border-primary);
  border-radius: var(--radius-2xl);
  background: linear-gradient(145deg, var(--bg-secondary), var(--bg-tertiary));
  overflow: hidden;
  transition: all var(--duration-300) var(--ease-out);
}

.term-card--featured::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-cyan), var(--accent-pink));
}

.term-card--featured:hover {
  border-color: var(--accent-primary);
  box-shadow: 0 20px 60px rgba(88, 166, 255, 0.15);
}

.term-number {
  position: absolute;
  top: var(--space-4);
  left: var(--space-5);
  width: 32px;
  height: 32px;
  background: var(--bg-tertiary);
  border: 2px solid var(--border-primary);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
  font-weight: var(--font-bold);
  color: var(--text-secondary);
  z-index: 0;
}

.term-card--featured .term-header {
  padding: var(--space-6) var(--space-6);
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  transition: background var(--duration-300) var(--ease-out);
}

.term-card--featured .term-header:hover {
  background: rgba(88, 166, 255, 0.05);
}

.term-card--featured .term-title-group {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex: 1;
}

.term-icon--blue { background: linear-gradient(135deg, #58a6ff, #39d0d8) !important; color: white !important; }
.term-icon--cyan { background: linear-gradient(135deg, #39d0d8, #a855f7) !important; color: white !important; }
.term-icon--purple { background: linear-gradient(135deg, #a855f7, #ec4899) !important; color: white !important; }
.term-icon--pink { background: linear-gradient(135deg, #ec4899, #f59e0b) !important; color: white !important; }
.term-icon--orange { background: linear-gradient(135deg, #f59e0b, #f97316) !important; color: white !important; }
.term-icon--green { background: linear-gradient(135deg, #10b981, #39d0d8) !important; color: white !important; }
.term-icon--red { background: linear-gradient(135deg, #ef4444, #f97316) !important; color: white !important; }
.term-icon--yellow { background: linear-gradient(135deg, #f59e0b, #eab308) !important; color: white !important; }

.term-card--featured .term-meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.term-card--featured .difficulty-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.term-card--featured .difficulty-badge.easy {
  background: rgba(16, 185, 129, 0.15);
  color: #10b981;
}

.term-card--featured .difficulty-badge.medium {
  background: rgba(245, 158, 11, 0.15);
  color: #f59e0b;
}

.term-card--featured .term-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-500) var(--ease-out), 
              padding var(--duration-400) var(--ease-out);
}

.term-card--featured.expanded .term-content {
  max-height: 1000px;
  padding: 0 var(--space-6) var(--space-6);
}

/* Legacy Quick Grid (fallback) */
.quick-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
  margin: var(--space-10) 0;
}

/* Legacy Quick Card (fallback) */
.quick-card {
  background: linear-gradient(145deg, var(--bg-secondary), var(--bg-tertiary));
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--duration-300) var(--ease-out);
  position: relative;
}

.quick-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-cyan));
}

.quick-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(88, 166, 255, 0.15);
  border-color: var(--accent-primary);
}

.quick-card.expanded {
  border-color: var(--accent-primary);
}

.quick-card__header {
  width: 100%;
  padding: var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  color: var(--text-primary);
}

.quick-card__header:hover {
  background: rgba(88, 166, 255, 0.05);
}

.quick-card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-2xl);
  color: white;
  flex-shrink: 0;
}

.quick-card__meta {
  flex: 1;
  min-width: 0;
}

.quick-card__toggle {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--duration-300) var(--ease-out);
  flex-shrink: 0;
}

.quick-card.expanded .quick-card__toggle {
  transform: rotate(180deg);
  background: var(--accent-primary);
  color: white;
}

.quick-card__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  margin-bottom: var(--space-1);
}

.quick-card__badge--easy {
  background: rgba(16, 185, 129, 0.15);
  color: #10b981;
}

.quick-card__badge--medium {
  background: rgba(245, 158, 11, 0.15);
  color: #f59e0b;
}

.quick-card__badge--advanced {
  background: rgba(139, 92, 246, 0.15);
  color: #8b5cf6;
}

.quick-card__title {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  margin: 0;
}

.quick-card__subtitle {
  font-size: var(--text-sm);
  color: var(--accent-primary);
  font-weight: var(--font-semibold);
  margin: var(--space-1) 0 0;
}

.quick-card__content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-400) var(--ease-out),
              padding var(--duration-400) var(--ease-out);
}

.quick-card.expanded .quick-card__content {
  max-height: 500px;
  padding: 0 var(--space-5) var(--space-5);
}

.quick-card__summary {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-4);
}

.quick-card__details {
  border-top: 1px solid var(--border-primary);
  padding-top: var(--space-4);
}

.quick-card__details p {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-3);
}

.quick-card__details strong {
  color: var(--text-primary);
}

.quick-card__example {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--bg-tertiary);
  border-radius: var(--radius-lg);
  margin: var(--space-3) 0;
}

.quick-card__example i {
  color: var(--accent-primary);
  font-size: var(--text-xl);
  flex-shrink: 0;
}

.quick-card__example p {
  margin: 0;
  font-size: var(--text-sm);
}

.quick-card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--accent-primary);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  text-decoration: none;
  margin-top: var(--space-3);
  transition: all var(--duration-300) var(--ease-out);
}

.quick-card__link:hover {
  gap: var(--space-3);
  color: var(--accent-cyan);
}

.quick-card__link i {
  font-size: var(--text-base);
}

/* ==========================================================================
   4. ALPHABET NAVIGATION
   Sticky alphabetical navigation
   ========================================================================== */

.alphabet-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2);
  margin: var(--space-8) 0;
  padding: var(--space-4);
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  position: sticky;
  top: var(--header-height);
  z-index: 10;
  backdrop-filter: blur(10px);
}

.alphabet-link {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  font-weight: var(--font-semibold);
  text-decoration: none;
  transition: all var(--duration-300) var(--ease-out);
}

.alphabet-link:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.alphabet-link.active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: white;
}

.alphabet-link.disabled {
  opacity: 0.3;
  cursor: not-allowed;
  pointer-events: none;
}

/* ==========================================================================
   5. LEXIKON SECTIONS (A-Z)
   Individual letter sections with term cards
   ========================================================================== */

.lexikon-section {
  margin-bottom: var(--space-10);
}

.section-header-letter {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-primary);
}

.letter-badge {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-cyan));
  border-radius: var(--radius-xl);
  color: white;
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
}

.section-header-letter h2 {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  margin: 0;
}

/**
 * Term Cards
 * Expandable definition cards
 */
.term-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-4);
  overflow: hidden;
  transition: all var(--duration-300) var(--ease-out);
}

.term-card:hover {
  border-color: var(--border-hover);
}

.term-card.hidden {
  display: none;
}

.term-header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  color: var(--text-primary);
}

.term-header:hover {
  background: rgba(88, 166, 255, 0.05);
}

.term-title-group {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex: 1;
  min-width: 0;
}

.term-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-2xl);
  color: var(--accent-primary);
  flex-shrink: 0;
}

.term-title {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  margin: 0;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.term-category {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-full);
}

.term-category.grundlagen {
  background: rgba(88, 166, 255, 0.15);
  color: var(--accent-primary);
}

.term-category.technik {
  background: rgba(139, 92, 246, 0.15);
  color: #8b5cf6;
}

.term-category.dialog {
  background: rgba(16, 185, 129, 0.15);
  color: #10b981;
}

.term-category.ethik {
  background: rgba(245, 158, 11, 0.15);
  color: #f59e0b;
}

.term-subtitle {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin: var(--space-1) 0 0;
}

.term-toggle {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--duration-300) var(--ease-out);
  flex-shrink: 0;
}

.term-card.expanded .term-toggle {
  transform: rotate(180deg);
  background: var(--accent-primary);
  color: white;
}

.term-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-400) var(--ease-out),
              padding var(--duration-400) var(--ease-out);
}

.term-card.expanded .term-content {
  max-height: 800px;
  padding: 0 var(--space-5) var(--space-5);
}

.term-definition {
  font-size: var(--text-base);
  color: var(--text-primary);
  margin-bottom: var(--space-5);
  padding: var(--space-4);
  background: var(--bg-tertiary);
  border-radius: var(--radius-lg);
  border-left: 3px solid var(--accent-primary);
  line-height: var(--leading-relaxed);
}

.term-blocks {
  display: grid;
  gap: var(--space-4);
}

.term-block {
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--bg-tertiary);
}

.term-block--explanation {
  border-left: 3px solid var(--accent-cyan);
}

.term-block--analogy {
  border-left: 3px solid var(--accent-pink);
}

.term-block--why {
  border-left: 3px solid #10b981;
}

.term-block--example {
  border-left: 3px solid #f59e0b;
}

.term-block h4 {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--text-secondary);
}

.term-block--explanation h4 { color: var(--accent-cyan); }
.term-block--analogy h4 { color: var(--accent-pink); }
.term-block--why h4 { color: #10b981; }
.term-block--example h4 { color: #f59e0b; }

.term-block p {
  margin: 0;
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  font-size: var(--text-sm);
}

/* Block variations for new design */
.term-block.explanation { border-left: 3px solid var(--accent-cyan); }
.term-block.analogy { border-left: 3px solid var(--accent-pink); }
.term-block.why { border-left: 3px solid #10b981; }
.term-block.example { border-left: 3px solid #f59e0b; }

.term-block.explanation h4 { color: var(--accent-cyan); }
.term-block.analogy h4 { color: var(--accent-pink); }
.term-block.why h4 { color: #10b981; }
.term-block.example h4 { color: #f59e0b; }

/* ==========================================================================
   6. NO RESULTS STATE
   Empty state for search/filter
   ========================================================================== */

.no-results {
  text-align: center;
  padding: var(--space-10) var(--space-6);
  color: var(--text-secondary);
}

.no-results i {
  font-size: 64px;
  color: var(--text-tertiary);
  margin-bottom: var(--space-4);
}

.no-results h3 {
  font-size: var(--text-xl);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.no-results p {
  margin-bottom: var(--space-6);
}

/* ==========================================================================
   7. STATS COMPONENT
   Premium hero statistics display
   ========================================================================== */

/* Hero Stats (Lexikon Hero) */
.lexikon-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-10);
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.lexikon-stats .stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-5) var(--space-4);
  background: linear-gradient(
    145deg,
    rgba(15, 23, 42, 0.7) 0%,
    rgba(30, 41, 59, 0.5) 100%
  );
  backdrop-filter: blur(12px);
  border: 1px solid rgba(88, 166, 255, 0.15);
  border-radius: var(--radius-2xl);
  position: relative;
  overflow: hidden;
  transition: all var(--duration-300) var(--ease-out);
}

.lexikon-stats .stat-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(88, 166, 255, 0.4), transparent);
  opacity: 0;
  transition: opacity var(--duration-300) var(--ease-out);
}

.lexikon-stats .stat-item:hover {
  border-color: rgba(88, 166, 255, 0.35);
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(88, 166, 255, 0.1);
}

.lexikon-stats .stat-item:hover::before {
  opacity: 1;
}

.lexikon-stats .stat-item--highlight {
  background: linear-gradient(
    145deg,
    rgba(88, 166, 255, 0.15) 0%,
    rgba(139, 92, 246, 0.1) 50%,
    rgba(15, 23, 42, 0.6) 100%
  );
  border-color: rgba(88, 166, 255, 0.3);
  box-shadow: 0 8px 32px rgba(88, 166, 255, 0.15);
}

.lexikon-stats .stat-item--highlight::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100px;
  height: 100px;
  background: radial-gradient(circle, rgba(88, 166, 255, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.lexikon-stats .stat-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-lg);
  background: rgba(88, 166, 255, 0.1);
  border: 1px solid rgba(88, 166, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  color: var(--accent-primary);
  margin-bottom: var(--space-3);
  transition: all var(--duration-300) var(--ease-out);
}

.lexikon-stats .stat-item:hover .stat-icon {
  background: rgba(88, 166, 255, 0.2);
  border-color: rgba(88, 166, 255, 0.4);
  transform: scale(1.05);
}

.lexikon-stats .stat-item--highlight .stat-icon {
  background: linear-gradient(135deg, rgba(88, 166, 255, 0.2), rgba(139, 92, 246, 0.15));
  border-color: rgba(88, 166, 255, 0.35);
  color: white;
}

.lexikon-stats .stat-number {
  font-family: 'Space Grotesk', var(--font-sans);
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  background: linear-gradient(135deg, #ffffff 0%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: var(--space-2);
}

.lexikon-stats .stat-item--highlight .stat-number {
  background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.lexikon-stats .stat-label {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  text-align: center;
}

/* Legacy Stats Container (for backward compatibility) */
.stats-container {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  margin-top: var(--space-8);
  flex-wrap: wrap;
}

.stats-container .stat-item {
  text-align: center;
  padding: var(--space-4) var(--space-6);
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
}

.stats-container .stat-number {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--accent-primary);
  display: block;
}

.stats-container .stat-label {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ==========================================================================
   8. RESPONSIVE ADAPTATIONS
   Mobile and tablet adjustments
   ========================================================================== */

@media (max-width: 768px) {
  .search-container {
    max-width: 100%;
    margin: 0 var(--space-4);
  }
  
  .search-input {
    padding-right: var(--space-4);
  }
  
  .search-shortcut {
    display: none;
  }
  
  .quick-start-header {
    margin-bottom: var(--space-8);
  }
  
  .quick-start-badge {
    font-size: var(--text-xs);
    padding: var(--space-1) var(--space-3);
  }
  
  .quick-start-lead {
    font-size: var(--text-base);
  }
  
  .term-card--featured .term-header {
    padding: var(--space-4);
    flex-wrap: wrap;
  }
  
  .term-card--featured .term-title-group {
    flex: 1 1 calc(100% - 60px);
  }
  
  .term-card--featured .term-meta {
    margin-left: 60px;
    margin-top: var(--space-2);
    width: 100%;
    justify-content: space-between;
  }
  
  .term-number {
    top: var(--space-3);
    left: var(--space-3);
    width: 28px;
    height: 28px;
    font-size: var(--text-xs);
  }
  
  .alphabet-nav {
    top: 70px;
    gap: var(--space-1);
    padding: var(--space-2);
  }
  
  .alphabet-link {
    width: 36px;
    height: 36px;
    font-size: var(--text-sm);
  }
  
  .term-header {
    padding: var(--space-4);
  }
  
  .term-title {
    font-size: var(--text-base);
  }
  
  .term-card.expanded .term-content,
  .term-card--featured.expanded .term-content {
    padding: 0 var(--space-4) var(--space-4);
  }
  
  .term-definition {
    padding: var(--space-3);
    font-size: var(--text-sm);
  }
  
  .term-block {
    padding: var(--space-3);
  }
  
  .section-header-letter {
    gap: var(--space-3);
  }
  
  .letter-badge {
    width: 40px;
    height: 40px;
    font-size: var(--text-lg);
  }
  
  .section-header-letter h2 {
    font-size: var(--text-xl);
  }
  
  .lexikon-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
    max-width: 400px;
  }
  
  .lexikon-stats .stat-item {
    padding: var(--space-4) var(--space-3);
    min-width: auto;
  }
  
  .lexikon-stats .stat-icon {
    width: 36px;
    height: 36px;
    font-size: var(--text-lg);
    margin-bottom: var(--space-2);
  }
  
  .lexikon-stats .stat-number {
    font-size: var(--text-2xl);
    margin-bottom: var(--space-1);
  }
  
  .lexikon-stats .stat-label {
    font-size: 10px;
    letter-spacing: 1px;
  }
  
  .stats-container {
    gap: var(--space-3);
  }
  
  .stats-container .stat-item {
    padding: var(--space-3) var(--space-4);
    flex: 1;
    min-width: 120px;
  }
  
  .stats-container .stat-number {
    font-size: var(--text-2xl);
  }
}

@media (max-width: 480px) {
  .quick-grid {
    grid-template-columns: 1fr;
  }
  
  .alphabet-nav {
    position: relative;
    top: auto;
  }
  
  .alphabet-link {
    width: 32px;
    height: 32px;
    font-size: var(--text-xs);
  }
  
  .term-icon {
    width: 40px;
    height: 40px;
    font-size: var(--text-xl);
  }
  
  .term-category {
    display: none;
  }
}

/* ==========================================================================
   9. LIGHT THEME ADAPTATIONS
   Color adjustments for light mode
   ========================================================================== */

html.light-theme .editorial-content {
  background: linear-gradient(
    135deg,
    rgba(88, 166, 255, 0.12) 0%,
    rgba(139, 92, 246, 0.06) 50%,
    rgba(248, 250, 252, 0.8) 100%
  );
}

html.light-theme .quick-card,
html.light-theme .term-card {
  background: white;
}

html.light-theme .quick-card__example,
html.light-theme .term-block {
  background: #f8fafc;
}

html.light-theme .term-definition {
  background: #f1f5f9;
}

html.light-theme .alphabet-nav {
  background: white;
}

html.light-theme .lexikon-stats .stat-item {
  background: linear-gradient(
    145deg,
    rgba(15, 23, 42, 0.9) 0%,
    rgba(30, 41, 59, 0.85) 100%
  );
  border-color: rgba(88, 166, 255, 0.25);
}

html.light-theme .stats-container .stat-item {
  background: white;
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  .editorial-content,
  .editorial-content::before,
  .quick-card,
  .term-card,
  .category-chip,
  .alphabet-link,
  .term-header,
  .term-content,
  .term-toggle,
  .cta-card,
  .cta-card__btn--primary,
  .cta-card__btn--secondary {
    transition: none;
  }
  
  .quick-card:hover,
  .alphabet-link:hover,
  .cta-card__btn--primary:hover,
  .cta-card__btn--secondary:hover {
    transform: none;
  }
}

.gradient-text { background: linear-gradient(135deg, #a855f7, #ec4899); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.gradient-bg { background: linear-gradient(135deg, #a855f7, #ec4899); }