/**
 * Main CSS - Dark grey theme, mobile-first, accessible
 * LearnCube.org - Production Design System
 */

/* ============================================
   DESIGN SYSTEM - WCA COLOR PALETTE
   ============================================ */

/* CSS Variables - Base Theme */
:root {
  /* Background Colors - Dark Grey Theme */
  --bg-primary: #1e1e1e;
  --bg-secondary: #2d2d2d;
  --bg-card: #363636;
  --bg-elevated: #404040;
  
  /* Text Colors - Improved Dark Mode Readability */
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.85);
  --text-muted: rgba(255, 255, 255, 0.7);
  
  /* WCA Cube Colors (Standard Competition Colors) */
  --cube-white: #ffffff;
  --cube-yellow: #ffd500;
  --cube-red: #c41e3a;
  --cube-orange: #ff5800;
  --cube-blue: #0045ad;
  --cube-green: #009b48;
  
  /* Accent Colors - Mode Specific */
  /* Speedcuber Mode (Default) - Teal/Cyan/Electric Blue + Amber */
  --accent-primary: #00d9ff;        /* Electric Cyan - Primary */
  --accent-secondary: #ffb300;      /* Amber - Secondary */
  --accent-glow: rgba(0, 217, 255, 0.3);
  --accent-primary-light: #4de8ff;
  --accent-primary-dark: #00a8cc;
  
  /* Kids Mode - Bright Yellow/Orange (no pink) */
  --accent-kids: #ffd700;           /* Bright Yellow - loved by kids */
  --accent-kids-light: #ffed4e;     /* Light Yellow */
  --accent-kids-dark: #ffb300;      /* Amber/Orange */
  --accent-kids-alt: #00d9ff;       /* Bright Cyan - alternative */
  
  /* Legacy aliases for compatibility */
  --accent-adult: var(--accent-primary);
  --accent-adult-light: var(--accent-primary-light);
  --accent-adult-dark: var(--accent-primary-dark);
  
  /* Semantic Colors */
  --accent-yellow: #ffd700;
  --accent-green: #00cc66;
  --accent-blue: #0066ff;
  --accent-red: #ff4444;
  --accent-orange: #ff8c00;
  
  /* UI Colors */
  --border-color: #4a4a4a;
  --border-light: #555555;
  --shadow: rgba(0, 0, 0, 0.4);
  --shadow-hover: rgba(0, 0, 0, 0.6);
  --overlay: rgba(0, 0, 0, 0.7);
  
  /* Spacing Scale */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  
  /* Typography Scale */
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 17px; /* Slightly increased for better readability */
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  
  /* Typography - Kids Mode */
  --font-kids-base: 18px;
  --font-kids-heading: 2.25rem;
  --line-height-kids: 1.8;
  
  /* Typography - Speedcuber Mode */
  --font-speed-base: 15px;
  --font-speed-heading: 1.75rem;
  --line-height-speed: 1.5;
  
  /* Border & Radius */
  --border-radius: 10px;
  --border-radius-sm: 6px;
  --border-radius-lg: 16px;
  --border-width: 1px;
  --border-width-thick: 2px;
  
  /* Transitions & Animations */
  --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.6, 1);
  
  /* Z-Index Scale */
  --z-base: 1;
  --z-elevated: 10;
  --z-sticky: 9999;
  --z-modal: 1000;
  --z-tooltip: 2000;
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--bg-primary);
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(0, 217, 255, 0.03) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(255, 107, 157, 0.03) 0%, transparent 50%);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Mode-Specific Typography */
/* Mode-aware accent colors */
body:not(.kids-mode),
html:not(.kids-mode) {
  --accent-primary: #00d9ff;
  --accent-secondary: #ffb300;
  --accent-glow: rgba(0, 217, 255, 0.3);
}

body.kids-mode,
html.kids-mode {
  font-size: var(--font-kids-base);
  line-height: var(--line-height-kids);
  --accent-primary: var(--accent-kids);
  --accent-secondary: var(--accent-kids-light);
  --accent-glow: rgba(255, 215, 0, 0.3);
}

body.kids-mode h1,
html.kids-mode h1 {
  font-size: var(--font-kids-heading);
  letter-spacing: -0.02em;
}

body.speedcuber-mode,
html.speedcuber-mode {
  font-size: var(--font-speed-base);
  line-height: var(--line-height-speed);
}

body.speedcuber-mode h1, html.speedcuber-mode h1,
html.speedcuber-mode h1 {
  font-size: var(--font-speed-heading);
  letter-spacing: -0.03em;
}

/* ============================================
   TYPOGRAPHY SYSTEM
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

h1 {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  margin-bottom: var(--spacing-md);
}

h2 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

h4 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

/* Kids Mode Typography */
body.kids-mode h1, html.kids-mode h1,
html.kids-mode h1 {
  font-weight: 800;
  color: var(--accent-kids);
}

body.kids-mode h2, html.kids-mode h2,
html.kids-mode h2 {
  color: var(--text-primary);
}

body.kids-mode h3, html.kids-mode h3,
html.kids-mode h3 {
  color: var(--text-primary);
}

/* Speedcuber Mode Typography */
body.speedcuber-mode h1, html.speedcuber-mode h1,
html.speedcuber-mode h1 {
  font-weight: 700;
  color: var(--accent-primary);
}

body.speedcuber-mode h2,
body.speedcuber-mode h3,
html.speedcuber-mode h2,
html.speedcuber-mode h3 {
  color: var(--text-primary);
  font-weight: 600;
}

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

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

a:hover {
  color: var(--accent-kids);
  text-decoration: underline;
}

/* Layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--spacing-md);
  }
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */

.site-header {
  background: linear-gradient(180deg, var(--bg-secondary) 0%, rgba(45, 45, 45, 0.95) 100%);
  border-bottom: var(--border-width-thick) solid var(--border-color);
  padding: var(--spacing-xs) 0;
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  backdrop-filter: blur(12px) saturate(180%);
  box-shadow: 0 4px 16px var(--shadow);
  transition: var(--transition-fast);
  overflow: visible !important;
}

.site-header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary), var(--accent-primary));
  background-size: 200% 100%;
  animation: shimmer 3s linear infinite;
}

body.kids-mode .site-header::after,
html.kids-mode .site-header::after {
  background: linear-gradient(90deg, var(--accent-kids), var(--accent-kids-alt), var(--accent-kids));
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  min-height: 50px;
}

.header-content .main-nav {
  flex: 1;
  justify-content: center;
}

.logo {
  text-decoration: none;
  transition: var(--transition);
}

.logo:hover {
  transform: scale(1.05);
}

.logo h1 {
  font-size: 1.1rem;
  margin: 0;
  color: var(--text-primary);
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 800;
  letter-spacing: -0.02em;
  transition: var(--transition);
}

body.kids-mode .logo h1,
html.kids-mode .logo h1 {
  background: linear-gradient(135deg, var(--accent-kids), var(--accent-kids-alt));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.main-nav {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
  flex-wrap: wrap;
  position: relative;
  z-index: 100;
  justify-content: center;
  flex: 1;
}

.main-nav .nav-link {
  color: var(--accent-primary);
  font-weight: 600;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius-sm);
  transition: var(--transition-fast);
  position: relative;
  text-decoration: none;
  font-size: var(--font-size-base);
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
}

.main-nav .nav-link::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--bg-card);
  border-radius: var(--border-radius-sm);
  opacity: 0;
  transition: var(--transition-fast);
  z-index: -1;
}

.main-nav .nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 70%;
  height: 2px;
  background: var(--accent-primary);
  border-radius: 2px;
  transition: var(--transition-fast);
}

.main-nav .nav-link:hover {
  color: var(--accent-kids);
  transform: translateY(-1px);
}

body.kids-mode .main-nav .nav-link,
html.kids-mode .main-nav .nav-link {
  color: var(--accent-kids);
}

body.kids-mode .main-nav .nav-link:hover,
html.kids-mode .main-nav .nav-link:hover {
  color: var(--accent-kids-alt);
}

.main-nav .nav-link:hover::before {
  opacity: 1;
}

.main-nav .nav-link:hover::after {
  transform: translateX(-50%) scaleX(1);
}

.main-nav .nav-link:active {
  transform: translateY(0);
}

body.kids-mode .main-nav .nav-link::after,
html.kids-mode .main-nav .nav-link::after {
  background: var(--accent-kids);
}

/* Active nav link */
.main-nav .nav-link.active {
  color: var(--accent-primary);
  background: var(--bg-card);
}

body.kids-mode .main-nav .nav-link.active,
html.kids-mode .main-nav .nav-link.active {
  color: var(--accent-kids);
}

body.kids-mode .nav-dropdown-toggle,
html.kids-mode .nav-dropdown-toggle {
  color: var(--accent-kids);
}

body.kids-mode .nav-dropdown-toggle:hover,
html.kids-mode .nav-dropdown-toggle:hover {
  color: var(--accent-kids-alt);
}

/* Mode Dropdown - Now integrated into navigation */
/* Mode Dropdown Options */
.mode-option {
  position: relative;
  padding-left: 28px !important;
}

.mode-option.active {
  background: var(--bg-secondary) !important;
  color: var(--accent-primary) !important;
  font-weight: 700;
}

.mode-option.active::before {
  content: '✓';
  position: absolute;
  left: 12px;
  color: var(--accent-primary);
  font-weight: bold;
  font-size: 0.9em;
}

.mode-option[data-mode-btn="kids"] {
  color: var(--accent-kids);
  background: transparent;
}

.mode-option[data-mode-btn="speedcuber"] {
  color: var(--accent-primary);
  background: transparent;
}

.mode-option[data-mode-btn="kids"].active {
  color: var(--accent-kids) !important;
  background: var(--bg-secondary) !important;
}

.mode-option[data-mode-btn="kids"].active::before {
  color: var(--accent-kids);
}

.mode-option[data-mode-btn="speedcuber"].active {
  color: var(--accent-primary) !important;
  background: var(--bg-secondary) !important;
}

.mode-option[data-mode-btn="speedcuber"].active::before {
  color: var(--accent-primary);
}

body.kids-mode .mode-option[data-mode-btn="kids"],
html.kids-mode .mode-option[data-mode-btn="kids"] {
  color: var(--accent-kids);
  background: transparent;
}

body.kids-mode .mode-option[data-mode-btn="kids"].active,
html.kids-mode .mode-option[data-mode-btn="kids"].active {
  background: var(--bg-secondary) !important;
  color: var(--accent-kids) !important;
}

@media (max-width: 767px) {
  .header-content {
    flex-direction: column;
    align-items: stretch;
  }
  
  .main-nav {
    order: 3;
    width: 100%;
    justify-content: center;
    margin-top: var(--spacing-sm);
  }
}

/* Mode icon removed - no longer used */

/* Main Content */
.main-content {
  flex: 1;
  padding: var(--spacing-lg) 0;
}

/* ============================================
   CARD SYSTEM
   ============================================ */

.card {
  background-color: var(--bg-card);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  box-shadow: 0 4px 12px var(--shadow);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

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

.card:hover {
  border-color: var(--border-light);
  box-shadow: 0 8px 24px var(--shadow-hover);
  transform: translateY(-2px);
}

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

.card h2,
.card h3 {
  margin-top: 0;
}

/* Kids Mode Cards */
body.kids-mode .card, html.kids-mode .card {
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
}

body.kids-mode .card::before,
html.kids-mode .card::before {
  background: linear-gradient(90deg, var(--accent-kids), var(--accent-kids-light));
}

/* Speedcuber Mode Cards */
body.speedcuber-mode .card, html.speedcuber-mode .card {
  padding: var(--spacing-md);
  border-radius: var(--border-radius-sm);
}

/* Algorithm Page Styles */
.algorithm-header {
  margin-bottom: var(--spacing-lg);
}

.algorithm-title {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
}

.algorithm-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.meta-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.375rem 0.875rem;
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-card));
  border-radius: var(--border-radius-sm);
  border: var(--border-width) solid var(--border-color);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-secondary);
  transition: var(--transition-fast);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.meta-badge:hover {
  background: linear-gradient(135deg, var(--bg-card), var(--bg-elevated));
  border-color: var(--accent-primary);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.cube-diagram {
  margin: var(--spacing-lg) 0;
  display: flex;
  justify-content: center;
  background-color: var(--bg-secondary);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
}

.cube-diagram svg {
  max-width: 100%;
  height: auto;
}

.algorithm-notation {
  background-color: var(--bg-secondary);
  border: 2px solid var(--accent-primary);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  font-family: 'Courier New', monospace;
  font-size: var(--font-size-lg);
  text-align: center;
  color: var(--text-primary);
  font-weight: 600;
}

.algorithm-notation-section {
  margin: var(--spacing-lg) 0;
}

.algorithm-notation-section code {
  font-family: 'Courier New', monospace;
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--accent-primary);
}

.algorithm-meta-info {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  margin-top: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.algorithm-meta-info span {
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--bg-secondary);
  border-radius: var(--border-radius-sm);
}

/* Practice CTA Section */
.practice-cta {
  text-align: center;
  background: linear-gradient(135deg, rgba(0, 217, 255, 0.1), rgba(255, 107, 157, 0.1));
  border: var(--border-width-thick) solid var(--accent-primary);
}

.practice-cta h2 {
  color: var(--accent-primary);
  margin-bottom: var(--spacing-md);
}

.practice-cta p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  font-size: var(--font-size-lg);
}

.btn-practice {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-primary-dark));
  color: var(--bg-primary);
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--border-radius);
  text-decoration: none;
  font-weight: 700;
  font-size: var(--font-size-lg);
  transition: var(--transition-fast);
  box-shadow: 0 4px 12px rgba(0, 217, 255, 0.3);
}

.btn-practice:hover {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-primary-dark));
  transform: translateY(-2px);
  box-shadow: 0 6px 16px var(--accent-glow);
  text-decoration: none;
  color: white;
}

body.kids-mode .btn-practice:hover,
html.kids-mode .btn-practice:hover {
  background: linear-gradient(135deg, var(--accent-kids), var(--accent-kids-dark));
  box-shadow: 0 6px 16px rgba(255, 215, 0, 0.4);
  color: var(--bg-primary);
}

body.kids-mode .practice-cta,
html.kids-mode .practice-cta {
  border-color: var(--accent-kids);
}

body.kids-mode .practice-cta h2,
html.kids-mode .practice-cta h2 {
  color: var(--accent-kids);
}

.explanation-section {
  margin: var(--spacing-lg) 0;
}

.explanation-kids,
.explanation-adult {
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-md);
}

.explanation-kids {
  background: linear-gradient(135deg, rgba(255, 107, 157, 0.15), rgba(255, 107, 157, 0.05));
  border-left: var(--border-width-thick) solid var(--accent-kids);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-lg);
  position: relative;
  box-shadow: 0 4px 12px rgba(255, 107, 157, 0.2);
}

.explanation-kids::before {
  content: '👶';
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  font-size: 2rem;
  opacity: 0.3;
}

.explanation-adult {
  background: linear-gradient(135deg, rgba(0, 217, 255, 0.15), rgba(0, 217, 255, 0.05));
  border-left: var(--border-width-thick) solid var(--accent-primary);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-lg);
  position: relative;
  box-shadow: 0 4px 12px rgba(0, 217, 255, 0.2);
}

.explanation-adult::before {
  content: '⚡';
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  font-size: 2rem;
  opacity: 0.3;
}

.explanation-kids h3::before {
  content: '👶 ';
}

.explanation-adult h3::before {
  content: '🧑 ';
}

.recognition-guide {
  margin: var(--spacing-lg) 0;
}

.recognition-guide ul {
  list-style-position: inside;
  margin-left: var(--spacing-sm);
}

.recognition-guide li {
  margin-bottom: var(--spacing-xs);
}

.mistakes-section {
  margin: var(--spacing-lg) 0;
}

.mistakes-section ul {
  list-style-position: inside;
  margin-left: var(--spacing-sm);
}

.mistakes-section li {
  margin-bottom: var(--spacing-xs);
  color: var(--accent-red);
}

.related-algorithms {
  margin: var(--spacing-lg) 0;
}

.related-algorithms ul {
  list-style: none;
  margin-left: 0;
}

.related-algorithms li {
  margin-bottom: var(--spacing-xs);
}

.related-algorithms a {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: var(--bg-secondary);
  border-radius: var(--border-radius);
  transition: var(--transition);
}

.related-algorithms a:hover {
  background-color: var(--bg-card);
  text-decoration: none;
}

/* Navigation */
.algorithm-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  transition: var(--transition);
}

.nav-link:hover {
  background-color: var(--bg-secondary);
  border-color: var(--accent-primary);
  text-decoration: none;
}

.nav-link.prev::before {
  content: '← ';
}

.nav-link.next::after {
  content: ' →';
}

/* ============================================
   GLOBAL FOOTER - ENHANCED
   ============================================ */

.site-footer {
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  border-top: var(--border-width-thick) solid var(--border-color);
  padding: var(--spacing-xl) 0 var(--spacing-md);
  margin-top: var(--spacing-2xl);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
  border-bottom: var(--border-width) solid var(--border-color);
}

.footer-section h3 {
  color: var(--text-primary);
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-kids));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-section h4 {
  color: var(--text-primary);
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
}

.footer-mission {
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 400px;
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.footer-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition-fast);
  padding: var(--spacing-xs) 0;
  position: relative;
  padding-left: var(--spacing-sm);
}

.footer-nav a::before {
  content: '→';
  position: absolute;
  left: 0;
  opacity: 0;
  transition: var(--transition-fast);
  color: var(--accent-primary);
}

.footer-nav a:hover {
  color: var(--text-primary);
  padding-left: var(--spacing-md);
}

.footer-nav a:hover::before {
  opacity: 1;
}

body.kids-mode .footer-nav a::before,
html.kids-mode .footer-nav a::before {
  color: var(--accent-kids);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-md);
  color: var(--text-muted);
  font-size: var(--font-size-xs);
}

.footer-offline-note {
  margin-top: var(--spacing-xs);
  font-size: 0.7rem;
  opacity: 0.85;
}

@media (max-width: 767px) {
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .footer-mission {
    max-width: 100%;
  }
}

/* ============================================
   MODE-SPECIFIC ENHANCEMENTS
   ============================================ */

/* Kids Mode Global Adjustments */
body.kids-mode,
html.kids-mode {
  --accent-primary: var(--accent-kids);
}

body.kids-mode .algorithm-notation, html.kids-mode .algorithm-notation {
  border-color: var(--accent-kids);
  font-size: var(--font-size-xl);
  box-shadow: 0 0 20px rgba(255, 107, 157, 0.2);
}

body.kids-mode .cube-diagram, html.kids-mode .cube-diagram {
  border: var(--border-width-thick) solid var(--accent-kids);
  box-shadow: 0 0 24px rgba(255, 107, 157, 0.3);
}

body.kids-mode .card,
html.kids-mode .card {
  border-color: var(--border-light);
}

body.kids-mode .card:hover,
html.kids-mode .card:hover {
  border-color: var(--accent-kids);
  box-shadow: 0 8px 32px rgba(255, 107, 157, 0.2);
}

/* Speedcuber Mode Global Adjustments */
body.speedcuber-mode .card, html.speedcuber-mode .card {
  border-color: var(--border-color);
}

body.speedcuber-mode .card, html.speedcuber-mode .card:hover {
  border-color: var(--accent-primary);
  box-shadow: 0 8px 24px rgba(0, 217, 255, 0.2);
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================
   ACCESSIBILITY & FOCUS STATES
   ============================================ */

a:focus,
button:focus,
input:focus {
  outline: var(--border-width-thick) solid var(--accent-primary);
  outline-offset: 3px;
  border-radius: var(--border-radius-sm);
}

body.kids-mode a, html.kids-mode a:focus,
body.kids-mode button, html.kids-mode button:focus,
body.kids-mode input, html.kids-mode input:focus {
  outline-color: var(--accent-kids);
  outline-width: 3px;
}

/* Skip to content link */
.skip-to-content {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent-primary);
  color: var(--bg-primary);
  padding: var(--spacing-sm);
  text-decoration: none;
  z-index: var(--z-tooltip);
  border-radius: 0 0 var(--border-radius-sm) 0;
}

.skip-to-content:focus {
  top: 0;
}

/* ============================================
   ALGORITHM VISUALIZER - ENHANCED
   ============================================ */

.algorithm-visualizer {
  background: linear-gradient(135deg, var(--bg-card), var(--bg-secondary));
  border: var(--border-width-thick) solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  margin: var(--spacing-xl) 0;
  box-shadow: 0 8px 24px var(--shadow);
  position: relative;
  overflow: hidden;
}

.algorithm-visualizer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-kids), var(--accent-primary));
  background-size: 200% 100%;
  animation: shimmer 3s linear infinite;
}

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

.cube-display-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 350px;
  background: radial-gradient(circle at center, var(--bg-secondary), var(--bg-primary));
  border: var(--border-width-thick) solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
  box-shadow: inset 0 2px 8px var(--shadow);
  position: relative;
}

.cube-display-container::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--border-radius-lg);
  padding: 2px;
  background: linear-gradient(135deg, var(--accent-primary), transparent, var(--accent-kids));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: var(--transition);
}

.cube-display-container:hover::after {
  opacity: 0.3;
}

.cube-svg-container {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
}

.algorithm-visualizer .cube-svg-container {
  max-width: 700px; /* Bigger for algorithm pages */
}

body.kids-mode .algorithm-visualizer .cube-svg-container,
html.kids-mode .algorithm-visualizer .cube-svg-container {
  max-width: 750px; /* Largest for kids */
}

.cube-svg {
  max-width: 100%;
  height: auto;
}

.algorithm-controls {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.move-list-container {
  background-color: var(--bg-secondary);
  border-radius: var(--border-radius);
  padding: var(--spacing-sm);
  max-height: 100px;
  overflow-y: auto;
}

.move-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  font-family: 'Courier New', monospace;
  font-size: var(--font-size-base);
}

.move-item {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 0.75rem;
  background: linear-gradient(135deg, var(--bg-card), var(--bg-secondary));
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: var(--transition-fast);
  color: var(--text-secondary);
  font-weight: 600;
  min-width: 48px;
  position: relative;
  overflow: hidden;
}

.move-item::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-kids));
  opacity: 0;
  transition: var(--transition-fast);
}

.move-item:hover {
  border-color: var(--accent-primary);
  color: var(--text-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 8px var(--shadow);
}

.move-item:hover::before {
  opacity: 0.1;
}

.move-item.active {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-primary-light));
  border-color: var(--accent-primary);
  color: var(--bg-primary);
  font-weight: 700;
  box-shadow: 0 0 16px rgba(0, 217, 255, 0.5);
  transform: scale(1.1);
  z-index: var(--z-elevated);
}

.move-item.completed {
  opacity: 0.6;
  background: var(--bg-secondary);
}

body.kids-mode .move-item.active, html.kids-mode .move-item.active {
  background: linear-gradient(135deg, var(--accent-kids), var(--accent-kids-light));
  border-color: var(--accent-kids);
  box-shadow: 0 0 16px rgba(255, 215, 0, 0.5);
  color: var(--bg-primary);
}

.move-item.completed {
  color: var(--text-primary);
  opacity: 0.7;
}

.animation-controls {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.btn-control {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-card));
  border: var(--border-width-thick) solid var(--border-color);
  color: var(--text-primary);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--border-radius);
  cursor: pointer;
  font-size: var(--font-size-base);
  font-weight: 600;
  transition: var(--transition-fast);
  min-width: 100px;
  justify-content: center;
  box-shadow: 0 2px 4px var(--shadow);
  position: relative;
  overflow: hidden;
}

.btn-control::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn-control:hover {
  background: linear-gradient(135deg, var(--bg-card), var(--bg-elevated));
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow-hover);
}

.btn-control:hover::before {
  width: 300px;
  height: 300px;
}

.btn-control:active {
  transform: translateY(0) scale(0.98);
}

.btn-control.playing {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-primary-dark));
  border-color: var(--accent-primary);
  color: var(--bg-primary);
  box-shadow: 0 0 20px rgba(0, 217, 255, 0.4);
}

body.kids-mode .btn-control.playing, html.kids-mode .btn-control.playing {
  background: linear-gradient(135deg, var(--accent-kids), var(--accent-kids-dark));
  border-color: var(--accent-kids);
  box-shadow: 0 0 20px rgba(255, 107, 157, 0.4);
}

.btn-control .icon {
  font-size: 1.2em;
}

.speed-control {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  justify-content: center;
}

.speed-control label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.speed-control input[type="range"] {
  flex: 1;
  max-width: 250px;
  height: 8px;
  background: linear-gradient(90deg, var(--bg-secondary), var(--bg-card));
  border-radius: 4px;
  outline: none;
  -webkit-appearance: none;
  cursor: pointer;
  box-shadow: inset 0 2px 4px var(--shadow);
}

.speed-control input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-primary-light));
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 2px 8px var(--shadow), 0 0 0 3px var(--bg-card);
  transition: var(--transition-fast);
}

.speed-control input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 4px 12px var(--shadow-hover), 0 0 0 3px var(--bg-card);
}

body.kids-mode .speed-control, html.kids-mode .speed-control input[type="range"]::-webkit-slider-thumb {
  background: linear-gradient(135deg, var(--accent-kids), var(--accent-kids-light));
  width: 24px;
  height: 24px;
}

.speed-control input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: var(--accent-primary);
  border-radius: 50%;
  cursor: pointer;
  border: none;
}

.speed-value {
  font-family: 'Courier New', monospace;
  font-size: var(--font-size-sm);
  color: var(--text-primary);
  min-width: 40px;
  text-align: right;
}

/* ============================================
   RECOGNITION PANEL - ENHANCED
   ============================================ */

.recognition-panel {
  background: linear-gradient(135deg, var(--bg-card), var(--bg-secondary));
  border: var(--border-width-thick) solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  margin: var(--spacing-xl) 0;
  box-shadow: 0 8px 24px var(--shadow);
  position: relative;
}

.recognition-panel::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--accent-yellow), var(--accent-orange));
  border-radius: var(--border-radius-sm) 0 0 var(--border-radius-sm);
}

.panel-title {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-lg);
  color: var(--text-primary);
  border-bottom: var(--border-width-thick) solid var(--accent-yellow);
  padding-bottom: var(--spacing-sm);
  position: relative;
  display: inline-block;
  width: 100%;
}

.panel-title::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 60px;
  height: 3px;
  background: var(--accent-orange);
  border-radius: 2px;
}

.recognition-visual {
  display: flex;
  justify-content: center;
  margin-bottom: var(--spacing-md);
}

.recognition-text {
  color: var(--text-secondary);
}

.recognition-summary {
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-lg);
  line-height: 1.6;
}

.recognition-notes {
  list-style: none;
  padding-left: 0;
}

.recognition-notes li {
  padding: var(--spacing-xs) 0;
  padding-left: var(--spacing-md);
  position: relative;
}

.recognition-notes li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent-yellow);
  font-size: 1.2em;
  line-height: 1;
  font-weight: bold;
}

.recognition-notes li {
  transition: var(--transition-fast);
  padding-left: var(--spacing-lg);
}

.recognition-notes li:hover {
  color: var(--text-primary);
  transform: translateX(4px);
}

/* ============================================
   EXPLANATION PANEL - ENHANCED
   ============================================ */

.explanation-panel {
  background: linear-gradient(135deg, var(--bg-card), var(--bg-secondary));
  border: var(--border-width-thick) solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  margin: var(--spacing-xl) 0;
  box-shadow: 0 8px 24px var(--shadow);
  position: relative;
  overflow: hidden;
}

.explanation-panel::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 100px;
  height: 100px;
  background: radial-gradient(circle, rgba(0, 217, 255, 0.1), transparent);
  border-radius: 50%;
  transform: translate(30%, -30%);
}

.explanation-content {
  font-size: var(--font-size-lg);
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
}

.mistakes-section {
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-color);
}

.mistakes-section h4 {
  font-size: var(--font-size-base);
  margin-bottom: var(--spacing-sm);
  color: var(--accent-red);
}

.mistakes-list {
  list-style: none;
  padding-left: 0;
}

.mistakes-list li {
  padding: var(--spacing-xs) 0;
  padding-left: var(--spacing-md);
  position: relative;
  color: var(--text-secondary);
}

.mistakes-list li::before {
  content: '⚠';
  position: absolute;
  left: 0;
  color: var(--accent-red);
}

/* ============================================
   COMPONENT-SPECIFIC MODE ADJUSTMENTS
   ============================================ */

/* Algorithm Visualizer Mode Styles */
body.kids-mode .algorithm-visualizer,
html.kids-mode .algorithm-visualizer {
  border-color: var(--accent-kids);
  padding: var(--spacing-2xl);
}

body.kids-mode .algorithm-visualizer::before,
html.kids-mode .algorithm-visualizer::before {
  background: linear-gradient(90deg, var(--accent-kids), var(--accent-kids-light), var(--accent-kids));
}

body.speedcuber-mode .algorithm-visualizer, html.speedcuber-mode .algorithm-visualizer {
  border-color: var(--accent-primary);
  padding: var(--spacing-lg);
}

body.speedcuber-mode .algorithm-visualizer, html.speedcuber-mode .algorithm-visualizer::before {
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-primary-light), var(--accent-primary));
}

/* Panel Title Mode Styles */
body.kids-mode .panel-title, html.kids-mode .panel-title {
  border-bottom-color: var(--accent-kids);
  color: var(--accent-kids);
}

body.kids-mode .panel-title::after,
html.kids-mode .panel-title::after {
  background: var(--accent-kids-light);
}

body.speedcuber-mode .panel-title, html.speedcuber-mode .panel-title {
  border-bottom-color: var(--accent-primary);
}

body.speedcuber-mode .panel-title, html.speedcuber-mode .panel-title::after {
  background: var(--accent-primary);
}

/* Button Control Mode Styles */
body.kids-mode .btn-control, html.kids-mode .btn-control:hover {
  border-color: var(--accent-kids);
  box-shadow: 0 4px 16px rgba(255, 107, 157, 0.3);
}

body.speedcuber-mode .btn-control, html.speedcuber-mode .btn-control:hover {
  border-color: var(--accent-primary);
  box-shadow: 0 4px 16px rgba(0, 217, 255, 0.3);
}

/* ============================================
   CUBE VISUALIZATION ENHANCEMENTS
   ============================================ */

/* Highlighted stickers */
.highlighted-sticker {
  filter: brightness(1.4) saturate(1.2);
  animation: highlightPulse 1.5s ease-in-out infinite;
  stroke: var(--accent-yellow);
  stroke-width: 2;
}

@keyframes highlightPulse {
  0%, 100% {
    opacity: 1;
    filter: brightness(1.4) saturate(1.2);
  }
  50% {
    opacity: 0.9;
    filter: brightness(1.6) saturate(1.4);
  }
}

body.kids-mode .highlighted-sticker, html.kids-mode .highlighted-sticker {
  stroke: var(--accent-kids);
  stroke-width: 3;
  animation: highlightPulseKids 1.2s ease-in-out infinite;
}

@keyframes highlightPulseKids {
  0%, 100% {
    opacity: 1;
    filter: brightness(1.5) saturate(1.3);
  }
  50% {
    opacity: 0.85;
    filter: brightness(1.7) saturate(1.5);
  }
}

/* Cube SVG container enhancements */
.cube-svg-container {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.cube-svg-container svg {
  filter: drop-shadow(0 4px 12px var(--shadow));
  transition: var(--transition);
  width: 100%;
  height: auto;
  min-width: 450px; /* Ensure minimum size on desktop */
}

.algorithm-visualizer .cube-svg-container svg {
  min-width: 500px; /* Bigger for algorithm pages on desktop */
}

body.kids-mode .algorithm-visualizer, html.kids-mode .algorithm-visualizer .cube-svg-container svg {
  min-width: 550px; /* Largest for kids on desktop */
}

/* Mobile: Remove min-widths (handled in mobile media query) */

.cube-svg-container:hover svg {
  filter: drop-shadow(0 8px 24px var(--shadow-hover));
  transform: scale(1.02);
}

body.kids-mode .cube-svg-container, html.kids-mode .cube-svg-container:hover svg {
  transform: scale(1.05);
}

/* Learning Path Dashboard Styles */
.learning-path-dashboard {
  padding: var(--spacing-lg) 0;
}

.dashboard-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.dashboard-header h1 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-sm);
}

.dashboard-description {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
}

.paths-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

@media (min-width: 768px) {
  .paths-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .paths-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.path-card {
  background: linear-gradient(135deg, var(--bg-card), var(--bg-secondary));
  border: var(--border-width-thick) solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  transition: var(--transition);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 12px var(--shadow);
}

.path-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-kids));
  transform: scaleX(0);
  transform-origin: left;
  transition: var(--transition);
}

.path-card:hover {
  border-color: var(--accent-primary);
  box-shadow: 0 8px 24px var(--shadow-hover);
  transform: translateY(-4px);
}

.path-card:hover::before {
  transform: scaleX(1);
}

.path-card-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  margin-bottom: var(--spacing-md);
}

.path-title {
  font-size: var(--font-size-xl);
  margin: 0;
  flex: 1;
}

.path-difficulty {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 4px;
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.difficulty-beginner {
  background-color: rgba(0, 204, 0, 0.2);
  color: var(--accent-green);
  border: 1px solid var(--accent-green);
}

.difficulty-intermediate {
  background-color: rgba(255, 215, 0, 0.2);
  color: var(--accent-yellow);
  border: 1px solid var(--accent-yellow);
}

.difficulty-advanced {
  background-color: rgba(255, 51, 51, 0.2);
  color: var(--accent-red);
  border: 1px solid var(--accent-red);
}

.path-description {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  flex: 1;
}

.path-progress {
  margin-bottom: var(--spacing-md);
}

.progress-bar {
  width: 100%;
  height: 8px;
  background-color: var(--bg-secondary);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: var(--spacing-sm);
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-primary-light));
  transition: width 0.5s var(--ease-out);
  position: relative;
  overflow: hidden;
  box-shadow: 0 0 10px rgba(0, 217, 255, 0.4);
}

.progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.3),
    transparent
  );
  animation: progressShine 2s infinite;
}

@keyframes progressShine {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(100%);
  }
}

body.kids-mode .progress-fill, html.kids-mode .progress-fill {
  background: linear-gradient(90deg, var(--accent-kids), var(--accent-kids-light));
  box-shadow: 0 0 10px rgba(255, 215, 0, 0.4);
}

.progress-stats {
  display: flex;
  justify-content: space-around;
  font-size: var(--font-size-sm);
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.stat-value {
  font-weight: 600;
  font-size: var(--font-size-lg);
  color: var(--text-primary);
}

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

.path-stages {
  margin-bottom: var(--spacing-md);
}

.path-stages h3 {
  font-size: var(--font-size-base);
  margin-bottom: var(--spacing-sm);
  color: var(--text-secondary);
}

.stages-list {
  list-style: none;
  padding: 0;
}

.stage-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-xs) 0;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.stage-order {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background-color: var(--bg-secondary);
  border-radius: 50%;
  font-weight: 600;
  font-size: var(--font-size-sm);
}

.path-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-md) var(--spacing-lg);
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-primary-dark));
  color: var(--bg-primary);
  border-radius: var(--border-radius);
  font-weight: 700;
  transition: var(--transition-fast);
  margin-top: auto;
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(0, 217, 255, 0.3);
  position: relative;
  overflow: hidden;
}

.path-link::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.path-link:hover {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-primary-dark));
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px var(--accent-glow);
  color: white;
}

body.kids-mode .path-link, html.kids-mode .path-link:hover {
  background: linear-gradient(135deg, var(--accent-kids), var(--accent-kids-dark));
  box-shadow: 0 6px 16px rgba(255, 215, 0, 0.4);
  color: var(--bg-primary);
}

.path-link:hover::before {
  width: 300px;
  height: 300px;
}

.path-link:active {
  transform: translateY(0);
}

/* Path Viewer Styles */
.path-viewer {
  padding: var(--spacing-lg) 0;
}

.path-header {
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.path-header h1 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-sm);
}

.path-meta {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
  flex-wrap: wrap;
}

.path-stages-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.path-stage {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
}

.stage-header {
  margin-bottom: var(--spacing-lg);
}

.stage-title-section {
  display: flex;
  gap: var(--spacing-md);
  align-items: start;
  margin-bottom: var(--spacing-md);
}

.stage-order {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-primary-dark));
  color: var(--bg-primary);
  border-radius: 50%;
  font-weight: 700;
  font-size: var(--font-size-xl);
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(0, 217, 255, 0.3);
  transition: var(--transition-fast);
  position: relative;
}

.stage-order::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-kids));
  opacity: 0;
  transition: var(--transition);
  z-index: -1;
}

.path-stage:hover .stage-order::before {
  opacity: 0.3;
}

body.kids-mode .stage-order, html.kids-mode .stage-order {
  background: linear-gradient(135deg, var(--accent-kids), var(--accent-kids-dark));
  box-shadow: 0 4px 12px rgba(255, 107, 157, 0.3);
  width: 56px;
  height: 56px;
  font-size: var(--font-size-2xl);
}

.stage-title {
  font-size: var(--font-size-2xl);
  margin: 0 0 var(--spacing-xs) 0;
  color: var(--text-primary);
  font-weight: 600;
}

.stage-description {
  color: var(--text-secondary);
  margin: 0;
}

/* Path viewer specific styles - only for learning path pages */
.path-viewer .path-header h1 {
  color: var(--text-primary);
}

.path-viewer .path-header .path-description {
  color: var(--text-secondary);
}

.path-viewer .meta-badge {
  color: var(--text-primary);
  background: var(--bg-secondary);
  padding: 0.25rem 0.75rem;
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.stage-progress {
  margin-top: var(--spacing-md);
}

.progress-text {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-top: var(--spacing-xs);
  display: block;
}

.stage-algorithms {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

@media (min-width: 768px) {
  .stage-algorithms {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .stage-algorithms {
    grid-template-columns: repeat(3, 1fr);
  }
}

.algorithm-card {
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-card));
  border: var(--border-width-thick) solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.algorithm-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--border-color);
  transition: var(--transition);
}

.algorithm-card:hover {
  border-color: var(--accent-primary);
  box-shadow: 0 4px 16px var(--shadow-hover);
  transform: translateY(-2px);
}

.algorithm-card:hover::before {
  background: linear-gradient(180deg, var(--accent-primary), var(--accent-kids));
  width: 4px;
}

.algorithm-card.status-mastered {
  border-color: var(--accent-green);
  box-shadow: 0 0 0 2px rgba(0, 204, 102, 0.2);
}

.algorithm-card.status-mastered::before {
  background: var(--accent-green);
}

.algorithm-card.status-practicing {
  border-color: var(--accent-yellow);
  box-shadow: 0 0 0 2px rgba(255, 215, 0, 0.2);
}

.algorithm-card.status-practicing::before {
  background: var(--accent-yellow);
}

.algorithm-card-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.status-icon {
  font-size: 1.5em;
  width: 24px;
  text-align: center;
}

.status-not-started .status-icon {
  color: var(--text-secondary);
  opacity: 0.5;
}

.status-practicing .status-icon {
  color: var(--accent-yellow);
  animation: statusPulse 2s ease-in-out infinite;
}

.status-mastered .status-icon {
  color: var(--accent-green);
  filter: drop-shadow(0 0 8px var(--accent-green));
}

@keyframes statusPulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.8;
    transform: scale(1.1);
  }
}

.algorithm-card-title {
  font-size: var(--font-size-lg);
  margin: 0;
  flex: 1;
}

.algorithm-card-content {
  margin-bottom: var(--spacing-md);
}

.algorithm-moves {
  font-family: 'Courier New', monospace;
  font-size: var(--font-size-base);
  background-color: var(--bg-primary);
  padding: var(--spacing-sm);
  border-radius: 4px;
  margin-bottom: var(--spacing-sm);
  text-align: center;
  font-weight: 600;
}

.algorithm-recognition {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin: 0;
}

.algorithm-card-actions {
  display: flex;
  gap: var(--spacing-sm);
}

.btn-status {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  background: linear-gradient(135deg, var(--bg-primary), var(--bg-secondary));
  border: var(--border-width) solid var(--border-color);
  color: var(--text-primary);
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-weight: 600;
  transition: var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.btn-status::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.05);
  opacity: 0;
  transition: var(--transition-fast);
}

.btn-status:hover {
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-card));
  border-color: var(--accent-primary);
  transform: translateY(-1px);
}

.btn-status:hover::before {
  opacity: 1;
}

.btn-status.active {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-primary-dark));
  border-color: var(--accent-primary);
  color: var(--bg-primary);
  box-shadow: 0 2px 8px rgba(0, 217, 255, 0.3);
}

.btn-learn {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-primary-dark));
  color: var(--bg-primary);
  border-radius: var(--border-radius-sm);
  text-align: center;
  font-size: var(--font-size-sm);
  font-weight: 700;
  transition: var(--transition-fast);
  text-decoration: none;
  box-shadow: 0 2px 8px rgba(0, 217, 255, 0.3);
  position: relative;
  overflow: hidden;
}

.btn-learn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn-learn:hover {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-primary-dark));
  color: white;
}

body.kids-mode .btn-learn, html.kids-mode .btn-learn:hover {
  background: linear-gradient(135deg, var(--accent-kids), var(--accent-kids-dark));
  color: var(--bg-primary);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255, 107, 157, 0.4);
}

.btn-learn:hover::before {
  width: 300px;
  height: 300px;
}

.error-message {
  text-align: center;
  padding: var(--spacing-xl);
  color: var(--accent-red);
}

/* ============================================
   RESPONSIVE DESIGN - MOBILE FIRST
   ============================================ */

/* ============================================
   MOBILE RESPONSIVENESS - CUBE VISUALIZATION FIX
   ============================================ */

/* Overflow protection */
body {
  overflow-x: hidden !important;
}

/* Responsive cube frame wrapper */
.cube-frame {
  width: 100%;
  max-width: 100%;
  margin: 0 auto;
  display: flex;
  justify-content: center;
  align-items: center;
  aspect-ratio: 1 / 1;
  padding: var(--spacing-sm);
}

@media (max-width: 768px) {
  .cube-frame {
    max-width: 360px !important; /* Kids mode default */
  }
  
  body.speedcuber-mode .cube-frame, html.speedcuber-mode .cube-frame {
    max-width: 300px !important; /* Speedcuber mode */
  }
  
  body.kids-mode .cube-frame, html.kids-mode .cube-frame {
    max-width: 360px !important; /* Kids mode */
  }
}

/* Remove all enforced min-widths on mobile */
@media (max-width: 768px) {
  /* Cube SVG containers - remove min-width */
  .cube-svg-container,
  .cube-svg-container svg,
  .algorithm-visualizer .cube-svg-container,
  .algorithm-visualizer .cube-svg-container svg,
  body.kids-mode .algorithm-visualizer, html.kids-mode .algorithm-visualizer .cube-svg-container svg {
    min-width: 0 !important;
    width: 100% !important;
    max-width: 100% !important;
    height: auto !important;
  }
  
  /* Make cube visuals fully fluid */
  .cube-svg-container {
    width: 100% !important;
    max-width: 100% !important;
    padding: var(--spacing-xs);
  }
  
  /* Cube display container */
  .cube-display-container {
    width: 100% !important;
    max-width: 100% !important;
    padding: var(--spacing-sm) !important;
    overflow: hidden;
  }
  
  /* Algorithm visualizer */
  .algorithm-visualizer {
    width: 100% !important;
    max-width: 100% !important;
    padding: var(--spacing-sm) !important;
    overflow: hidden;
  }
  
  /* Stack algorithm controls vertically */
  .algorithm-controls {
    flex-direction: column !important;
    width: 100%;
  }
  
  .animation-controls {
    flex-direction: column !important;
    width: 100%;
    gap: var(--spacing-xs);
  }
  
  .btn-control {
    width: 100% !important;
    min-width: 0 !important;
  }
}

@media (max-width: 767px) {
  /* Typography adjustments */
  h1 {
    font-size: var(--font-size-2xl);
  }

  h2 {
    font-size: var(--font-size-xl);
  }

  /* Algorithm controls */
  .algorithm-controls {
    gap: var(--spacing-sm);
  }

  .animation-controls {
    gap: var(--spacing-xs);
    flex-wrap: wrap;
  }

  .btn-control {
    min-width: 70px;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
  }

  .move-list {
    font-size: var(--font-size-sm);
    gap: 0.25rem;
  }

  .move-item {
    padding: 0.375rem 0.5rem;
    min-width: 40px;
    font-size: var(--font-size-xs);
  }

  /* Cube display */
  .cube-display-container {
    min-height: 280px;
    padding: var(--spacing-md);
  }

  /* Cards */
  .card {
    padding: var(--spacing-md);
  }

  /* Learning paths */
  .paths-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .path-card {
    padding: var(--spacing-lg);
  }

  .stage-algorithms {
    grid-template-columns: 1fr;
  }

  /* Header */
  .header-content {
    flex-direction: column;
    align-items: stretch;
  }

  .main-nav {
    flex-wrap: wrap;
    justify-content: center;
  }

  .mode-selector {
    margin-left: 0;
    align-self: center;
  }

  /* Algorithm visualizer */
  .algorithm-visualizer {
    padding: var(--spacing-md);
  }

  /* Recognition & Explanation panels */
  .recognition-panel,
  .explanation-panel {
    padding: var(--spacing-md);
  }
}

/* Tablet adjustments */
@media (min-width: 768px) and (max-width: 1023px) {
  .paths-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stage-algorithms {
    grid-template-columns: repeat(2, 1fr);
  }
  
  /* Header spacing adjustments for tablet */
  .site-header.header-v2,
  .site-header {
    padding: 0.4rem 0 !important;
  }
  
  .header-v2 .container,
  .site-header .container {
    padding: 0 var(--spacing-sm) !important;
  }
  
  .header-v2 .header-content,
  .site-header .header-content {
    gap: 0.5rem !important;
    min-height: 45px !important;
  }
  
  .header-v2 .main-nav,
  .site-header .main-nav {
    gap: 0.4rem !important;
  }
  
  .header-v2 .nav-link,
  .site-header .nav-link,
  .main-nav .nav-link {
    padding: 0.4rem 0.6rem !important;
    font-size: 0.85rem !important;
  }
  
  .header-v2 .logo h1,
  .site-header .logo h1,
  .logo h1 {
    font-size: 0.95rem !important;
  }
  
  .header-v2 .logo-cube-icon,
  .site-header .logo-cube-icon,
  .logo-cube-icon {
    width: 26px !important;
    height: 26px !important;
  }
}

/* 1024px laptop adjustments */
@media (min-width: 1024px) and (max-width: 1279px) {
  /* Header spacing adjustments for 1024px laptop */
  .site-header.header-v2,
  .site-header {
    padding: 0.5rem 0 !important;
  }
  
  .header-v2 .container,
  .site-header .container {
    padding: 0 var(--spacing-md) !important;
  }
  
  .header-v2 .header-content,
  .site-header .header-content {
    gap: 0.75rem !important;
    min-height: 48px !important;
  }
  
  .header-v2 .main-nav,
  .site-header .main-nav {
    gap: 0.5rem !important;
  }
  
  .header-v2 .nav-link,
  .site-header .nav-link,
  .main-nav .nav-link {
    padding: 0.5rem 0.8rem !important;
    font-size: 0.95rem !important;
  }
  
  .header-v2 .logo h1,
  .site-header .logo h1,
  .logo h1 {
    font-size: 1.2rem !important;
  }
  
  .header-v2 .logo-cube-icon,
  .site-header .logo-cube-icon,
  .logo-cube-icon {
    width: 30px !important;
    height: 30px !important;
  }
}

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

@media print {
  .site-header,
  .site-footer,
  .mode-selector,
  .algorithm-nav,
  .algorithm-controls,
  .animation-controls,
  .btn-control,
  .speed-control,
  #header-placeholder,
  #footer-placeholder,
  .breadcrumbs,
  #scroll-to-top-placeholder,
  .btn-print,
  .mobile-menu-toggle,
  .mobile-menu-overlay,
  .progress-indicator,
  .progress-badge,
  .your-progress-card {
    display: none !important;
  }

  body {
    background: white !important;
    color: black !important;
    font-size: 12pt;
  }

  .card {
    border: 1px solid #ccc;
    box-shadow: none;
    page-break-inside: avoid;
  }

  h1, h2, h3 {
    page-break-after: avoid;
  }

  a {
    color: #000;
    text-decoration: underline;
  }
}

/* ============================================
   LOADING STATES & ANIMATIONS
   ============================================ */

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

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.8;
    transform: scale(1.05);
  }
}

.card,
.algorithm-card,
.path-card {
  animation: fadeIn 0.5s var(--ease-out);
}

.move-item.active {
  animation: pulse 1s ease-in-out infinite;
}

/* Loading spinner */
.loading-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

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

/* Selection colors */
::selection {
  background: var(--accent-primary);
  color: var(--bg-primary);
}

body.kids-mode, html.kids-mode ::selection {
  background: var(--accent-kids);
}

/* ============================================
   PRACTICE ENGINE STYLES
   ============================================ */

/* Practice Dashboard */
.practice-dashboard {
  padding: var(--spacing-lg) 0;
}

.dashboard-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.dashboard-header h1 {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-sm);
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

body.kids-mode .dashboard-header, html.kids-mode .dashboard-header h1 {
  background: linear-gradient(135deg, var(--accent-kids), var(--accent-kids-alt));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.dashboard-description {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  max-width: 800px;
  margin: 0 auto;
}

/* Practice Navigation Tabs */
.practice-nav {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xl);
  border-bottom: var(--border-width-thick) solid var(--border-color);
  flex-wrap: wrap;
}

.nav-tab {
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  color: var(--text-secondary);
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-lg);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-fast);
  position: relative;
  bottom: -2px;
}

.nav-tab:hover {
  color: var(--text-primary);
  background: var(--bg-secondary);
}

.nav-tab.active {
  color: var(--accent-primary);
  border-bottom-color: var(--accent-primary);
}

body.kids-mode .nav-tab.active, html.kids-mode .nav-tab.active {
  color: var(--accent-kids);
  border-bottom-color: var(--accent-kids);
}

.practice-section {
  display: none;
}

.practice-section.active {
  display: block;
  animation: fadeIn 0.3s var(--ease-out);
}

/* Random Trainer */
.random-trainer {
  background: var(--bg-card);
  border: var(--border-width-thick) solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
}

.trainer-header {
  margin-bottom: var(--spacing-lg);
  border-bottom: var(--border-width) solid var(--border-color);
  padding-bottom: var(--spacing-md);
}

.trainer-header h2 {
  margin-bottom: var(--spacing-md);
}

.trainer-filters {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  align-items: center;
}

.filter-select {
  background: var(--bg-secondary);
  border: var(--border-width) solid var(--border-color);
  color: var(--text-primary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-base);
  cursor: pointer;
  transition: var(--transition-fast);
}

.filter-select:hover {
  border-color: var(--accent-primary);
  background: var(--bg-card);
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  cursor: pointer;
  user-select: none;
}

.toggle-label input[type="checkbox"] {
  width: 20px;
  height: 20px;
  cursor: pointer;
}

.trainer-content {
  margin-top: var(--spacing-lg);
}

.case-display {
  background: var(--bg-secondary);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.case-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.case-name {
  font-size: var(--font-size-2xl);
  margin: 0;
}

.case-visual {
  margin: var(--spacing-lg) 0;
}

.case-algorithm {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: var(--border-width) solid var(--border-color);
}

.recognition-prompt {
  background: linear-gradient(135deg, rgba(0, 217, 255, 0.1), rgba(255, 107, 157, 0.1));
  border: var(--border-width-thick) solid var(--accent-primary);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  text-align: center;
  margin-top: var(--spacing-lg);
}

.recognition-prompt p {
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-lg);
}

.recognition-hint {
  margin-top: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--bg-primary);
  border-radius: var(--border-radius-sm);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.trainer-controls {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--spacing-lg);
}

.btn-trainer {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-card));
  border: var(--border-width-thick) solid var(--border-color);
  color: var(--text-primary);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--border-radius);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-fast);
  box-shadow: 0 2px 8px var(--shadow);
}

.btn-trainer:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow-hover);
}

.btn-trainer .icon {
  font-size: 1.2em;
}

.btn-reveal {
  background: linear-gradient(135deg, var(--accent-yellow), var(--accent-orange));
  border-color: var(--accent-orange);
  color: var(--bg-primary);
}

.btn-correct {
  background: linear-gradient(135deg, var(--accent-green), #00aa55);
  border-color: var(--accent-green);
  color: var(--bg-primary);
}

.btn-incorrect {
  background: linear-gradient(135deg, var(--accent-red), #cc2222);
  border-color: var(--accent-red);
  color: var(--bg-primary);
}

.btn-next {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-primary-dark));
  border-color: var(--accent-primary);
  color: var(--bg-primary);
}

.trainer-stats {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: var(--border-width) solid var(--border-color);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-md);
}

.stat-card {
  background: var(--bg-secondary);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  text-align: center;
  transition: var(--transition-fast);
}

.stat-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-2px);
}

.stat-icon {
  font-size: 2rem;
  margin-bottom: var(--spacing-xs);
}

.stat-value {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--accent-primary);
  margin-bottom: var(--spacing-xs);
}

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

/* Timed Drill */
.timed-drill {
  background: var(--bg-card);
  border: var(--border-width-thick) solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
}

.drill-header {
  margin-bottom: var(--spacing-lg);
  border-bottom: var(--border-width) solid var(--border-color);
  padding-bottom: var(--spacing-md);
}

.drill-header h2 {
  margin-bottom: var(--spacing-md);
}

.drill-settings {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
  flex-wrap: wrap;
}

.drill-settings label {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--text-secondary);
}

.drill-settings input[type="number"] {
  width: 60px;
  padding: var(--spacing-xs);
  background: var(--bg-secondary);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--border-radius-sm);
  color: var(--text-primary);
  text-align: center;
}

.drill-idle {
  text-align: center;
  padding: var(--spacing-2xl);
}

.drill-inspecting,
.drill-executing {
  margin-top: var(--spacing-lg);
}

.timer-display {
  margin: var(--spacing-xl) 0;
  text-align: center;
}

.timer-section {
  background: var(--bg-secondary);
  border: var(--border-width-thick) solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
}

.timer-label {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.timer-value {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--accent-primary);
  font-family: 'Courier New', monospace;
  margin: var(--spacing-md) 0;
}

.countdown-bar {
  width: 100%;
  height: 12px;
  background: var(--bg-primary);
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  margin-top: var(--spacing-md);
}

.countdown-fill {
  height: 100%;
  background: var(--accent-primary);
  transition: width 0.1s linear;
  border-radius: var(--border-radius-sm);
}

.drill-controls {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--spacing-lg);
}

.btn-end-inspection {
  background: linear-gradient(135deg, var(--accent-orange), #ff6600);
  border-color: var(--accent-orange);
  color: var(--bg-primary);
}

.btn-stop-correct {
  background: linear-gradient(135deg, var(--accent-green), #00aa55);
  border-color: var(--accent-green);
  color: var(--bg-primary);
}

.btn-stop-incorrect {
  background: linear-gradient(135deg, var(--accent-red), #cc2222);
  border-color: var(--accent-red);
  color: var(--bg-primary);
}

.btn-start,
.btn-next-drill {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-primary-dark));
  border-color: var(--accent-primary);
  color: var(--bg-primary);
  font-size: var(--font-size-lg);
  padding: var(--spacing-lg) var(--spacing-xl);
}

.drill-complete {
  text-align: center;
  padding: var(--spacing-xl);
}

.result-display {
  background: var(--bg-secondary);
  border: var(--border-width-thick) solid var(--accent-green);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
}

.result-display h3 {
  color: var(--accent-green);
  margin-bottom: var(--spacing-lg);
}

.result-times {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.result-time {
  text-align: center;
}

.result-label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
}

.result-value {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--accent-primary);
  font-family: 'Courier New', monospace;
}

.result-comparison {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: var(--border-width) solid var(--border-color);
}

.comparison-item {
  display: flex;
  justify-content: space-between;
  padding: var(--spacing-sm) 0;
  color: var(--text-secondary);
}

.comparison-item span:last-child {
  color: var(--text-primary);
  font-weight: 600;
}

/* Practice Stats */
.practice-stats {
  background: var(--bg-card);
  border: var(--border-width-thick) solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
}

.practice-stats h2 {
  margin-bottom: var(--spacing-lg);
  border-bottom: var(--border-width-thick) solid var(--accent-primary);
  padding-bottom: var(--spacing-sm);
}

.stats-overview {
  margin-bottom: var(--spacing-xl);
}

.weakness-analysis {
  margin-bottom: var(--spacing-xl);
}

.weakness-analysis h3 {
  margin-bottom: var(--spacing-md);
  color: var(--accent-orange);
}

.weakness-empty,
.recent-empty {
  text-align: center;
  padding: var(--spacing-xl);
  color: var(--text-secondary);
}

.weakness-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.weakness-item {
  background: var(--bg-secondary);
  border: var(--border-width-thick) solid var(--accent-orange);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  transition: var(--transition-fast);
}

.weakness-item:hover {
  border-color: var(--accent-red);
  transform: translateX(4px);
}

.weakness-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.weakness-id {
  font-weight: 700;
  color: var(--text-primary);
  font-size: var(--font-size-lg);
}

.weakness-badges {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.weakness-badge {
  background: var(--accent-orange);
  color: var(--bg-primary);
  padding: 0.25rem 0.5rem;
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
}

.weakness-details {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.weakness-stat {
  display: flex;
  justify-content: space-between;
  padding: var(--spacing-xs);
  background: var(--bg-primary);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-sm);
}

.weakness-stat span:first-child {
  color: var(--text-secondary);
}

.weakness-stat span:last-child {
  color: var(--text-primary);
  font-weight: 600;
}

.btn-practice-case {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-primary-dark));
  color: var(--bg-primary);
  border-radius: var(--border-radius);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition-fast);
}

.btn-practice-case:hover {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-primary-dark));
  transform: translateY(-2px);
  text-decoration: none;
  color: white;
}

body.kids-mode .btn-practice-case, html.kids-mode .btn-practice-case:hover {
  background: linear-gradient(135deg, var(--accent-kids), var(--accent-kids-dark));
  color: var(--bg-primary);
}

.recent-practice {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-xl);
  border-top: var(--border-width) solid var(--border-color);
}

.recent-practice h3 {
  margin-bottom: var(--spacing-md);
  color: var(--accent-primary);
}

.recent-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.recent-item {
  background: var(--bg-secondary);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  transition: var(--transition-fast);
}

.recent-item:hover {
  border-color: var(--accent-primary);
  transform: translateX(4px);
}

.recent-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xs);
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.recent-id {
  font-weight: 600;
  color: var(--text-primary);
}

.recent-time {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.recent-stats {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

/* ============================================
   BREADCRUMBS
   ============================================ */

.breadcrumbs {
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-sm) 0;
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--spacing-xs);
  align-items: center;
}

.breadcrumbs li {
  display: flex;
  align-items: center;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.breadcrumbs li:not(:last-child)::after {
  content: '›';
  margin-left: var(--spacing-xs);
  color: var(--text-muted);
}

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

.breadcrumbs a:hover {
  color: var(--accent-kids);
  text-decoration: underline;
}

.breadcrumbs li[aria-current="page"] {
  color: var(--text-primary);
  font-weight: 600;
}

body.kids-mode .breadcrumbs, html.kids-mode .breadcrumbs a {
  color: var(--accent-kids);
}

/* ============================================
   HUB PAGES
   ============================================ */

.hub-page {
  padding: var(--spacing-lg) 0;
}

.hub-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: var(--border-width-thick) solid var(--border-color);
}

.hub-header h1 {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

body.kids-mode .hub-header, html.kids-mode .hub-header h1 {
  background: linear-gradient(135deg, var(--accent-kids), var(--accent-kids-alt));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hub-description {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  max-width: 800px;
  margin: 0 auto var(--spacing-md);
  line-height: 1.7;
}

.hub-stats {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
  margin-top: var(--spacing-md);
}

.hub-stats .stat {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-secondary);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--border-radius);
  font-weight: 600;
  color: var(--text-primary);
}

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

.difficulty-section,
.type-section {
  margin-bottom: var(--spacing-xl);
}

/* Step Cards for Learning Paths */
.step-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.step-card {
  background: var(--bg-card);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  text-align: center;
  transition: var(--transition);
}

.step-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--shadow);
}

.step-number {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin: 0 auto var(--spacing-md);
}

body.kids-mode .step-number, html.kids-mode .step-number {
  background: linear-gradient(135deg, var(--accent-kids), var(--accent-kids-alt));
}

.step-card h3 {
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.step-card p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

.highlight-box {
  background: var(--bg-secondary);
  border-left: 4px solid var(--accent-primary);
  padding: var(--spacing-lg);
}

body.kids-mode .highlight-box, html.kids-mode .highlight-box {
  border-left-color: var(--accent-kids);
}

/* Step Navigation */
.step-navigation {
  display: flex;
  justify-content: space-between;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  margin-top: var(--spacing-lg);
}

.step-navigation .btn-trainer {
  flex: 1;
  min-width: 150px;
  text-align: center;
}

@media (max-width: 767px) {
  .step-navigation {
    flex-direction: column;
  }
  
  .step-navigation .btn-trainer {
    width: 100%;
  }
}

/* Phase 11: Progress indicators (hidden in Speedcuber via .kids-mode-only) */
.progress-indicator {
  margin: var(--spacing-sm) 0;
}

.progress-badge {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.progress-marker-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition-fast);
}

.progress-marker-btn:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

body.kids-mode .progress-marker-btn, html.kids-mode .progress-marker-btn:hover {
  border-color: var(--accent-kids);
  color: var(--accent-kids);
}

.your-progress-card {
  border-left: 4px solid var(--accent-primary);
}

body.kids-mode .your-progress-card, html.kids-mode .your-progress-card {
  border-left-color: var(--accent-kids);
}

/* Print button - small, right-aligned, colorful */
.hub-header,
.algorithm-header {
  position: relative;
  margin-bottom: var(--spacing-lg);
}

.btn-print {
  position: absolute;
  top: 0;
  right: 0;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-xs);
  cursor: pointer;
  transition: var(--transition-fast);
  z-index: 10;
}

.btn-print:hover {
  background: var(--bg-elevated);
  border-color: var(--accent-primary);
  transform: translateY(-1px);
}

.btn-print-icon {
  font-size: 1rem;
  line-height: 1;
}

.btn-print-text {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 600;
}

body.kids-mode .btn-print-text, html.kids-mode .btn-print-text {
  background: linear-gradient(135deg, var(--accent-kids), var(--accent-kids-alt));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

@media (max-width: 767px) {
  .btn-print {
    position: static;
    margin-top: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    width: auto;
  }
  
  .hub-header,
  .algorithm-header {
    margin-bottom: var(--spacing-md);
  }
}

/* Mode-specific visibility */
.kids-mode-only {
  display: none;
}

.speedcuber-mode-only {
  display: block;
}

body.kids-mode .kids-mode-only, html.kids-mode .kids-mode-only {
  display: block;
}

body.kids-mode .speedcuber-mode-only, html.kids-mode .speedcuber-mode-only {
  display: none;
}

body.speedcuber-mode .kids-mode-only, html.speedcuber-mode .kids-mode-only {
  display: none;
}

body.speedcuber-mode .speedcuber-mode-only, html.speedcuber-mode .speedcuber-mode-only {
  display: block;
}

.algorithm-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-sm);
}

.algorithm-item {
  margin: 0;
}

.algorithm-link {
  display: flex;
  flex-direction: column;
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--border-radius);
  text-decoration: none;
  color: var(--text-primary);
  transition: var(--transition-fast);
  gap: var(--spacing-xs);
}

.algorithm-link:hover {
  background: var(--bg-card);
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow);
  text-decoration: none;
}

.algorithm-id {
  font-weight: 700;
  color: var(--accent-primary);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
}

.algorithm-name {
  font-weight: 600;
  font-size: var(--font-size-lg);
  color: var(--text-primary);
}

.algorithm-moves {
  font-family: 'Courier New', monospace;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-top: var(--spacing-xs);
}

body.kids-mode .algorithm-link, html.kids-mode .algorithm-link:hover {
  border-color: var(--accent-kids);
}

body.kids-mode .algorithm-id, html.kids-mode .algorithm-id {
  color: var(--accent-kids);
}

/* Feature Grid for Homepage */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.feature-card {
  background: var(--bg-secondary);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  transition: var(--transition-fast);
}

.feature-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow);
}

.feature-card h3 {
  color: var(--accent-primary);
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-xl);
}

.feature-card p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

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

.feature-card li {
  margin-bottom: var(--spacing-xs);
}

.feature-card a {
  color: var(--accent-primary);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition-fast);
}

.feature-card a:hover {
  color: var(--accent-kids);
  text-decoration: underline;
}

body.kids-mode .feature-card, html.kids-mode .feature-card h3 {
  color: var(--accent-kids);
}

body.kids-mode .feature-card, html.kids-mode .feature-card a {
  color: var(--accent-kids);
}

/* Styled Lists */
.styled-list {
  list-style: none;
  padding: 0;
  margin: var(--spacing-md) 0;
}

.styled-list li {
  padding: var(--spacing-sm) 0;
  padding-left: var(--spacing-lg);
  position: relative;
  border-bottom: var(--border-width) solid transparent;
  transition: var(--transition-fast);
}

.styled-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent-primary);
  font-weight: bold;
  transition: var(--transition-fast);
}

.styled-list li:hover {
  padding-left: var(--spacing-xl);
  border-bottom-color: var(--border-color);
}

.styled-list li:hover::before {
  color: var(--accent-kids);
  transform: translateX(4px);
}

.styled-list a {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition-fast);
}

.styled-list a:hover {
  color: var(--accent-primary);
  text-decoration: underline;
}

body.kids-mode .styled-list, html.kids-mode .styled-list li::before {
  color: var(--accent-kids);
}

body.kids-mode .styled-list, html.kids-mode .styled-list a:hover {
  color: var(--accent-kids);
}

/* Layout System Enhancements */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

.main-content {
  flex: 1;
  padding: var(--spacing-xl) 0;
  min-height: calc(100vh - 200px);
}

@media (max-width: 767px) {
  .main-content {
    padding: var(--spacing-lg) 0;
  }
}

@media (max-width: 767px) {
  .algorithm-list {
    grid-template-columns: 1fr;
  }
  
  .hub-stats {
    flex-direction: column;
    align-items: center;
  }
}

/* Mobile adjustments for practice */
@media (max-width: 767px) {
  .trainer-filters {
    flex-direction: column;
    align-items: stretch;
  }

  .filter-select {
    width: 100%;
  }

  .trainer-controls {
    flex-direction: column;
  }

  .btn-trainer {
    width: 100%;
    justify-content: center;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .result-times {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }

  .drill-complete {
    padding: var(--spacing-md);
  }

  .result-display {
    padding: var(--spacing-md);
    overflow-x: auto;
    word-wrap: break-word;
  }

  .result-display h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
  }

  .result-value {
    font-size: var(--font-size-xl);
  }

  .result-comparison {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
  }

  .comparison-item {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) 0;
  }

  .comparison-item span {
    word-break: break-word;
    overflow-wrap: break-word;
  }

  .weakness-details {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   CONTENT PAGES (About, Contact, Legal)
   ============================================ */
.content-page {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
}

.content-page h1 {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-lg);
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

body.kids-mode .content-page, html.kids-mode .content-page h1 {
  background: linear-gradient(135deg, var(--accent-kids), var(--accent-kids-alt));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.content-page h2 {
  font-size: var(--font-size-2xl);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.content-page h3 {
  font-size: var(--font-size-xl);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.content-page p {
  margin-bottom: var(--spacing-md);
  line-height: 1.7;
  color: var(--text-secondary); /* Improved contrast: rgba(255,255,255,0.85) */
}

.content-page ul,
.content-page ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-lg);
  color: var(--text-secondary); /* Improved contrast: rgba(255,255,255,0.85) */
}

.content-page li {
  margin-bottom: var(--spacing-xs);
  line-height: 1.6;
}

.content-page a {
  color: var(--accent-primary);
  text-decoration: underline;
  transition: var(--transition-fast);
}

.content-page a:hover {
  color: var(--accent-primary-light);
  text-decoration: none;
}

body.kids-mode .content-page, html.kids-mode .content-page a {
  color: var(--accent-kids);
}

body.kids-mode .content-page, html.kids-mode .content-page a:hover {
  color: var(--accent-kids-light);
}

.content-page section {
  margin-bottom: var(--spacing-xl);
}

.contact-info {
  background: var(--bg-card);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--border-radius);
}

/* ============================================
   PHASE 7: ENHANCED UI/UX (2026-GRADE)
   ============================================ */

/* Header V2 - Redesigned */
.header-v2 {
  position: relative;
  overflow: visible !important;
}

.header-background-pattern {
  position: absolute;
  inset: 0;
  background-image: url('../svg/cube-pattern.svg');
  background-repeat: repeat;
  background-size: 200px 200px;
  opacity: 0.02;
  pointer-events: none;
  z-index: 0;
}

body.kids-mode .header-background-pattern, html.kids-mode .header-background-pattern {
  opacity: 0.035;
}

.header-v2 .header-content {
  position: relative;
  z-index: 9999;
  overflow: visible !important;
}

.header-v2 .container {
  position: relative;
  z-index: 9999;
  overflow: visible !important;
}

.logo-cube-icon {
  width: 36px;
  height: 36px;
  margin-right: var(--spacing-xs);
  transition: var(--transition);
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.logo:hover .logo-cube-icon {
  transform: rotate(15deg) scale(1.1);
  filter: drop-shadow(0 4px 8px var(--accent-glow));
  animation: slowGlow 2s ease-in-out infinite;
}

body.kids-mode .logo, html.kids-mode .logo:hover .logo-cube-icon {
  animation: wobble 0.5s ease-in-out;
}

@keyframes slowGlow {
  0%, 100% { filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2)) drop-shadow(0 0 8px var(--accent-glow)); }
  50% { filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2)) drop-shadow(0 0 16px var(--accent-glow)); }
}

@keyframes wobble {
  0%, 100% { transform: rotate(0deg); }
  25% { transform: rotate(-5deg); }
  75% { transform: rotate(5deg); }
}

/* Enhanced Nav Links */
.header-v2 .nav-link {
  border-radius: var(--border-radius);
  padding: var(--spacing-sm) var(--spacing-md);
  position: relative;
  overflow: visible;
  z-index: 1;
  font-size: var(--font-size-base);
  color: var(--accent-primary);
}

.header-v2 .nav-dropdown {
  z-index: 10000;
  position: relative;
}

/* Ensure header and dropdowns are above all content */
.site-header,
.header-v2 {
  position: relative;
  z-index: 9999 !important;
  overflow: visible !important;
}

/* Navigation Dropdown */
.nav-dropdown {
  position: relative;
  display: inline-block;
}

.nav-dropdown-toggle {
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: var(--font-size-base);
  color: var(--accent-primary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius-sm);
  position: relative;
  overflow: visible;
  z-index: 1;
}

.nav-dropdown-toggle .dropdown-arrow {
  font-size: 0.65em;
  margin-left: 0.3em;
  transition: transform 0.3s ease;
  display: inline-block;
  vertical-align: middle;
}

.nav-dropdown[aria-expanded="true"] .nav-dropdown-toggle .dropdown-arrow {
  transform: rotate(180deg);
}

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: 0 8px 24px var(--shadow);
  min-width: 140px;
  max-width: 180px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease;
  z-index: 10000 !important;
  list-style: none;
  padding: 2px 0;
  margin: 0;
  overflow: visible;
}

.nav-dropdown[aria-expanded="true"] .nav-dropdown-menu {
  opacity: 1 !important;
  visibility: visible !important;
  transform: translateY(0) !important;
  display: block !important;
}

.nav-dropdown-menu li {
  margin: 0;
}

.nav-dropdown-menu .nav-link {
  display: block;
  padding: 6px 12px;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 0;
  white-space: nowrap;
  transition: var(--transition-fast);
  font-size: 0.85rem;
  line-height: 1.3;
}

.nav-dropdown-menu .nav-link:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
  transform: translateX(2px);
}

.nav-dropdown-menu .nav-link::before,
.nav-dropdown-menu .nav-link::after {
  display: none;
}

/* Submenu support (for nested dropdowns) */
.nav-dropdown-submenu {
  position: relative;
}

.nav-submenu-label {
  font-weight: 600;
  color: var(--text-primary);
  cursor: default;
  pointer-events: none;
}

.nav-dropdown-submenu-list {
  list-style: none;
  padding: 0;
  margin: 0;
  padding-left: var(--spacing-md);
}

.nav-dropdown-submenu-list .nav-link {
  font-size: 0.8rem;
  padding: 4px 12px;
}

@media (max-width: 1023px) {
  .nav-dropdown-menu {
    min-width: 130px;
    max-width: 160px;
  }
}

@media (max-width: 767px) {
  .nav-dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    background: transparent;
    margin: 0;
    padding: 0;
    min-width: auto;
    max-width: none;
  }
  
  .nav-dropdown[aria-expanded="true"] .nav-dropdown-menu {
    display: block !important;
    opacity: 1 !important;
    visibility: visible !important;
  }
  
  .nav-dropdown[aria-expanded="false"] .nav-dropdown-menu {
    display: none !important;
  }
  
  .nav-dropdown-toggle {
    width: 100%;
    text-align: left;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .nav-dropdown-menu .nav-link {
    padding: var(--spacing-sm) var(--spacing-xl);
    font-size: 1.1rem;
  }
}

.header-v2 .nav-link::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--bg-card);
  border-radius: var(--border-radius);
  opacity: 0;
  transition: var(--transition-fast);
  z-index: -1;
}

.header-v2 .nav-link:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow);
}

.header-v2 .nav-link:hover::before {
  opacity: 1;
}

.header-v2 .nav-link.active {
  background: var(--bg-card);
  color: var(--accent-primary);
  box-shadow: 0 0 0 2px var(--accent-primary);
}

body.kids-mode .header-v2, html.kids-mode .header-v2 .nav-link.active {
  color: var(--accent-kids);
  box-shadow: 0 0 0 2px var(--accent-kids);
}

.header-v2 .nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 3px;
  background: var(--accent-primary);
  border-radius: 2px;
  animation: glow 2s ease-in-out infinite;
}

body.kids-mode .header-v2, html.kids-mode .header-v2 .nav-link.active::after {
  background: var(--accent-kids);
}

@keyframes glow {
  0%, 100% { opacity: 1; box-shadow: 0 0 8px currentColor; }
  50% { opacity: 0.7; box-shadow: 0 0 16px currentColor; }
}

/* Toggle CSS removed - replaced with simple mode selector */

/* Mobile Menu */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: transparent;
  border: none;
  padding: var(--spacing-xs);
  cursor: pointer;
  z-index: 1000;
}

.mobile-menu-toggle span {
  width: 24px;
  height: 3px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

@media (max-width: 767px) {
  /* 1. Disable header interaction on mobile - single interaction layer */
  .header-v2,
  .header-v2 * {
    pointer-events: none;
  }

  /* Allow logo + hamburger only */
  .header-v2 .logo,
  .header-v2 .logo *,
  .header-v2 .mobile-menu-toggle {
    pointer-events: auto;
  }

  /* Mobile Header - Minimal Height */
  .header-v2,
  .site-header.header-v2,
  .site-header {
    position: sticky !important;
    top: 0 !important;
    z-index: 100 !important;
    padding: var(--spacing-xs) 0 !important;
    min-height: auto !important;
    height: auto !important;
  }
  
  .header-v2 .container,
  .site-header .container {
    padding: 0 var(--spacing-md) !important;
  }
  
  .header-v2 .header-content,
  .site-header .header-content {
    display: flex !important;
    flex-direction: row !important;
    align-items: center !important;
    justify-content: space-between !important;
    gap: var(--spacing-sm) !important;
    padding: 0 !important;
    min-height: 50px !important;
  }
  
  /* Logo - Compact */
  .header-v2 .logo,
  .site-header .logo {
    display: flex !important;
    align-items: center !important;
    gap: var(--spacing-xs) !important;
    padding: 0 !important;
    flex-shrink: 0;
  }
  
  .header-v2 .logo h1,
  .site-header .logo h1 {
    font-size: 1.1rem !important;
    margin: 0 !important;
  }
  
  .header-v2 .logo-cube-icon,
  .site-header .logo-cube-icon {
    width: 32px !important;
    height: 32px !important;
  }
  
  /* Hide nav and mode toggle in header on mobile */
  .header-v2 .main-nav,
  .site-header .main-nav {
    display: none !important;
  }
  
  
  /* Show hamburger button */
  .mobile-menu-toggle {
    display: flex !important;
    flex-direction: column !important;
    gap: 4px !important;
    background: transparent !important;
    border: none !important;
    padding: var(--spacing-xs) !important;
    cursor: pointer !important;
    z-index: 10001 !important;
    position: relative !important;
    visibility: visible !important;
    opacity: 1 !important;
  }
  
  .mobile-menu-toggle span {
    width: 24px !important;
    height: 3px !important;
    background: var(--text-primary) !important;
    border-radius: 2px !important;
    transition: all 0.3s ease !important;
    display: block !important;
  }
  
  .mobile-menu-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px) !important;
  }
  
  .mobile-menu-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0 !important;
  }
  
  .mobile-menu-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px) !important;
  }
  
  /* 2. Mobile menu overlay owns all interaction */
  .mobile-menu-overlay {
    position: fixed !important;
    inset: 0 !important;
    width: 100vw !important;
    height: 100vh !important;
    background: rgba(0, 0, 0, 0.95) !important;
    backdrop-filter: blur(10px) !important;
    z-index: 999999 !important;
    display: flex !important;
    flex-direction: column !important;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    overflow-y: auto !important;
    -webkit-overflow-scrolling: touch !important;
    pointer-events: auto !important;
  }
  
  .mobile-menu-overlay.mobile-menu-open {
    opacity: 1;
    visibility: visible;
  }
  
  /* Close button */
  .mobile-menu-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: transparent;
    border: 2px solid var(--text-primary);
    color: var(--text-primary);
    font-size: 1.5rem;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10001;
    transition: all 0.2s ease;
  }
  
  .mobile-menu-close:hover,
  .mobile-menu-close:focus {
    background: var(--text-primary);
    color: var(--bg-primary);
    transform: scale(1.1);
  }
  
  /* Menu content */
  .mobile-menu-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-2xl) var(--spacing-lg);
    padding-top: 80px;
    gap: var(--spacing-lg);
    overflow-y: auto;
    pointer-events: auto !important;
    position: relative;
    z-index: 1;
  }
  
  /* Navigation links in overlay */
  .mobile-menu-nav {
    display: flex !important;
    flex-direction: column !important;
    gap: var(--spacing-sm) !important;
    width: 100% !important;
    pointer-events: auto !important;
    position: relative;
    z-index: 1;
  }
  
  .mobile-menu-nav .nav-link {
    display: block !important;
    padding: var(--spacing-md) var(--spacing-lg) !important;
    font-size: 1.25rem !important;
    font-weight: 600 !important;
    color: var(--text-primary) !important;
    text-decoration: none !important;
    border-radius: var(--border-radius) !important;
    background: rgba(255, 255, 255, 0.05) !important;
    border: 1px solid rgba(255, 255, 255, 0.1) !important;
    transition: all 0.2s ease !important;
    text-align: left !important;
  }
  
  .mobile-menu-nav .nav-link:hover,
  .mobile-menu-nav .nav-link:focus {
    background: rgba(255, 255, 255, 0.1) !important;
    border-color: var(--accent-primary) !important;
    transform: translateX(4px);
  }
  
  /* Dropdown in mobile menu - MUST be interactive */
  .mobile-menu-overlay .nav-dropdown,
  .mobile-menu-nav .nav-dropdown {
    width: 100% !important;
    pointer-events: auto !important;
    position: relative;
    z-index: 2;
  }
  
  /* 3. Enable dropdown buttons ONLY inside overlay */
  .mobile-menu-overlay .nav-dropdown-toggle,
  .mobile-menu-nav .nav-dropdown-toggle {
    width: 100% !important;
    text-align: left !important;
    padding: var(--spacing-md) var(--spacing-lg) !important;
    font-size: 1.25rem !important;
    font-weight: 600 !important;
    color: var(--text-primary) !important;
    background: rgba(255, 255, 255, 0.05) !important;
    border: 1px solid rgba(255, 255, 255, 0.1) !important;
    border-radius: var(--border-radius) !important;
    display: flex !important;
    justify-content: space-between !important;
    align-items: center !important;
    margin-bottom: var(--spacing-xs) !important;
    pointer-events: auto !important;
    cursor: pointer !important;
    touch-action: manipulation !important;
    -webkit-tap-highlight-color: rgba(0, 217, 255, 0.3) !important;
    z-index: 1 !important;
    position: relative !important;
  }

  .mobile-menu-overlay .nav-dropdown-toggle * {
    pointer-events: auto !important;
  }

  /* 4. Disable header dropdowns completely on mobile */
  .header-v2 .nav-dropdown,
  .header-v2 .nav-dropdown-toggle,
  .site-header .nav-dropdown,
  .site-header .nav-dropdown-toggle {
    display: none;
  }
  
  .mobile-menu-nav .nav-dropdown-menu {
    position: static !important;
    opacity: 1 !important;
    visibility: visible !important;
    transform: none !important;
    box-shadow: none !important;
    border: none !important;
    background: transparent !important;
    margin: 0 0 var(--spacing-sm) 0 !important;
    padding: 0 0 0 var(--spacing-md) !important;
    min-width: auto !important;
    max-width: none !important;
    display: none !important;
  }
  
  .mobile-menu-nav .nav-dropdown[aria-expanded="true"] .nav-dropdown-menu {
    display: block !important;
  }
  
  .mobile-menu-nav .nav-dropdown-menu .nav-link {
    padding: var(--spacing-sm) var(--spacing-xl) !important;
    font-size: 1.1rem !important;
    margin-bottom: 2px !important;
  }
  
  /* Mode toggle in overlay */
  /* Mobile menu mode selector */
  
  /* 5. Prevent background scroll when menu is open */
  body.mobile-menu-open,
  body.menu-open {
    overflow: hidden !important;
    position: fixed !important;
    width: 100% !important;
    touch-action: none !important;
    -webkit-overflow-scrolling: none !important;
  }
}

/* Desktop/Tablet: Ensure original nav is visible and overlay is hidden */
@media (min-width: 768px) {
  .header-v2 .main-nav {
    display: flex !important;
    position: relative;
    z-index: 10001;
    overflow: visible !important;
  }
  
  .header-v2 .nav-dropdown {
    overflow: visible !important;
    z-index: 10001;
  }
  
  .header-v2 .nav-dropdown-menu {
    position: absolute !important;
    z-index: 10002 !important;
    overflow: visible !important;
  }
  
  /* Mode selector wrapper - no special styling needed */
  
  .mobile-menu-toggle {
    display: none !important;
  }
  
  .mobile-menu-overlay {
    display: none !important;
  }
}

/* Footer V2 - Redesigned */
.footer-v2 {
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  border-top: var(--border-width-thick) solid var(--border-color);
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.footer-v2 .footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
  border-bottom: var(--border-width) solid var(--border-color);
}

/* Force 5-column layout when footer-5col class is present */
.footer-v2 .footer-content.footer-5col {
  display: grid !important;
  grid-template-columns: repeat(5, minmax(180px, 1fr)) !important;
  align-items: start !important;
  gap: var(--spacing-lg) !important;
}

@media (max-width: 1400px) {
  .footer-v2 .footer-content.footer-5col {
    grid-template-columns: repeat(4, minmax(200px, 1fr)) !important;
  }
}

@media (max-width: 1200px) {
  .footer-v2 .footer-content.footer-5col {
    grid-template-columns: repeat(3, minmax(220px, 1fr)) !important;
  }
}

@media (max-width: 768px) {
  .footer-v2 .footer-content.footer-5col {
    grid-template-columns: 1fr !important;
  }
}

.footer-brand {
  max-width: 300px;
}

.footer-cube-illustration {
  margin-bottom: var(--spacing-md);
  display: flex;
  justify-content: flex-start;
}

.footer-cube-illustration svg {
  min-width: 64px;
  min-height: 64px;
}

.cube-rotate {
  animation: slowRotate 20s linear infinite;
  filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.3));
}

@media (prefers-reduced-motion: reduce) {
  .cube-rotate {
    animation: none;
  }
}

@keyframes slowRotate {
  0% { transform: rotateY(0deg); }
  100% { transform: rotateY(360deg); }
}

.footer-v2 h3 {
  color: var(--text-primary);
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-md);
  margin-top: 0;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

body.kids-mode .footer-v2, html.kids-mode .footer-v2 h3 {
  background: linear-gradient(135deg, var(--accent-kids), var(--accent-kids-alt));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-v2 h4 {
  color: var(--text-primary);
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-md);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.footer-v2 .footer-nav {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-secondary);
  text-decoration: none;
  padding: var(--spacing-xs) 0;
  transition: var(--transition-fast);
  position: relative;
  padding-left: var(--spacing-sm);
}

.footer-link::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%) scaleX(0);
  width: 3px;
  height: 16px;
  background: var(--accent-primary);
  border-radius: 2px;
  transition: var(--transition-fast);
}

.footer-link:hover {
  color: var(--text-primary);
  padding-left: var(--spacing-md);
  transform: translateX(4px);
}

.footer-link:hover::before {
  transform: translateY(-50%) scaleX(1);
}

body.kids-mode .footer-link, html.kids-mode .footer-link::before {
  background: var(--accent-kids);
}

.footer-link-icon {
  flex-shrink: 0;
  opacity: 0.7;
  transition: var(--transition-fast);
  width: 20px; /* Larger icons */
  height: 20px;
}

.footer-link:hover .footer-link-icon {
  opacity: 1;
  transform: scale(1.1) rotate(5deg);
}

.footer-link-emoji {
  font-size: var(--font-size-lg);
  flex-shrink: 0;
}

/* Scroll to Top Button */
.scroll-to-top-btn {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border: none;
  border-radius: 50%;
  color: var(--bg-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s ease;
  z-index: 9999;
}

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

.scroll-to-top-btn:hover {
  transform: translateY(-5px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.4);
  background: linear-gradient(135deg, var(--accent-primary-light), var(--accent-secondary));
}

.scroll-to-top-btn:active {
  transform: translateY(-2px);
}

body.kids-mode .scroll-to-top-btn, html.kids-mode .scroll-to-top-btn {
  background: linear-gradient(135deg, var(--accent-kids), var(--accent-kids-alt));
}

body.kids-mode .scroll-to-top-btn, html.kids-mode .scroll-to-top-btn:hover {
  background: linear-gradient(135deg, var(--accent-kids-light), var(--accent-kids-alt));
}

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

@media (max-width: 768px) {
  .scroll-to-top-btn {
    bottom: 1.5rem;
    right: 1.5rem;
    width: 45px;
    height: 45px;
  }
  
  .scroll-to-top-btn svg {
    width: 20px;
    height: 20px;
  }
}

/* Homepage Hero Section */
.hero-section {
  text-align: center;
  padding: var(--spacing-2xl) 0;
  margin-bottom: var(--spacing-2xl);
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
  max-width: 1000px;
  margin: 0 auto;
}

.hero-text h1 {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-kids));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.hero-text p {
  font-size: var(--font-size-xl);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  justify-content: center;
}

.btn-hero {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-lg);
  font-weight: 600;
  border-radius: var(--border-radius-lg);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  transition: var(--transition);
  border: 2px solid transparent;
}

.btn-hero-primary {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-kids));
  color: white;
  box-shadow: 0 4px 16px rgba(0, 217, 255, 0.3);
}

.btn-hero-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0, 217, 255, 0.4);
}

.btn-hero-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-hero-secondary:hover {
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow);
}

.hero-illustration {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-illustration svg {
  max-width: 100%;
  height: auto;
  filter: drop-shadow(0 8px 16px rgba(0, 0, 0, 0.3));
}

@media (max-width: 767px) {
  .hero-content {
    grid-template-columns: 1fr;
  }
  
  .hero-text h1 {
    font-size: var(--font-size-3xl);
  }
  
  .hero-cta {
    flex-direction: column;
  }
  
  .btn-hero {
    width: 100%;
    justify-content: center;
  }
}

/* Feature Cards Enhancement */
.features-section {
  margin-top: var(--spacing-2xl);
}

.section-title {
  text-align: center;
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-xl);
  color: var(--text-primary);
}

.feature-card {
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  text-align: center;
  padding: var(--spacing-xl);
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  display: block;
}

.feature-card h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.feature-card p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

.feature-links {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
}

.feature-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0, 217, 255, 0.1), rgba(255, 107, 157, 0.1));
  opacity: 0;
  transition: var(--transition);
  z-index: 0;
}

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

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--shadow-hover);
}

.feature-card > * {
  position: relative;
  z-index: 1;
}

/* Visual Hints Toggle (Kids Mode) */
.visual-hints-toggle {
  display: none;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-card);
  border: 2px solid var(--accent-kids);
  border-radius: var(--border-radius);
  color: var(--accent-kids);
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
}

body.kids-mode .visual-hints-toggle, html.kids-mode .visual-hints-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.visual-hints-toggle:hover {
  background: var(--accent-kids);
  color: var(--bg-primary);
}

.visual-hints-toggle.active {
  background: var(--accent-kids);
  color: var(--bg-primary);
}

/* Breadcrumb Enhancement */
.breadcrumbs {
  margin-bottom: var(--spacing-lg);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  list-style: none;
  padding: 0;
}

.breadcrumbs li {
  display: flex;
  align-items: center;
}

.breadcrumbs li::after {
  content: '›';
  margin: 0 var(--spacing-xs);
  color: var(--text-muted);
}

.breadcrumbs li:last-child::after {
  display: none;
}

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

.breadcrumbs a:hover {
  color: var(--accent-primary);
}

body.kids-mode .breadcrumbs, html.kids-mode .breadcrumbs a:hover {
  color: var(--accent-kids);
}

/* Cube Icons in Lists */
.styled-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent-primary);
  font-weight: bold;
  transition: var(--transition-fast);
}

body.kids-mode .styled-list, html.kids-mode .styled-list li::before {
  content: '🧩';
  font-size: var(--font-size-sm);
}

/* Background Watermark Pattern */
body {
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url('../svg/cube-pattern.svg');
  background-repeat: repeat;
  background-size: 300px 300px;
  opacity: 0.015;
  pointer-events: none;
  z-index: 0;
}

body.kids-mode, html.kids-mode::before {
  opacity: 0.025;
}

.main-content {
  position: relative;
  z-index: 1;
}

/* Notation Help Panel Styles */
.notation-help-wrapper {
    margin-top: var(--spacing-md, 1rem);
    border-top: 1px solid var(--border-color, rgba(255, 255, 255, 0.1));
    padding-top: var(--spacing-md, 1rem);
}

.notation-help-toggle {
    width: 100%;
    background: transparent;
    border: 1px solid var(--border-color, rgba(255, 255, 255, 0.1));
    border-radius: var(--border-radius, 8px);
    padding: var(--spacing-sm, 0.75rem) var(--spacing-md, 1rem);
    color: var(--text-primary, #ffffff);
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs, 0.5rem);
    transition: all 0.2s ease;
    text-align: left;
}

.notation-help-toggle:hover {
    background: var(--bg-hover, rgba(255, 255, 255, 0.05));
    border-color: var(--accent-primary, #00d4ff);
}

.notation-help-toggle:focus {
    outline: 2px solid var(--accent-primary, #00d4ff);
    outline-offset: 2px;
}

.help-icon {
    font-size: 1.1rem;
}

.help-text {
    flex: 1;
}

.help-arrow {
    font-size: 0.8rem;
    transition: transform 0.2s ease;
}

.notation-help-content {
    margin-top: var(--spacing-md, 1rem);
    padding: var(--spacing-md, 1rem);
    background: var(--bg-card, rgba(255, 255, 255, 0.05));
    border-radius: var(--border-radius, 8px);
    border: 1px solid var(--border-color, rgba(255, 255, 255, 0.1));
}

.notation-help-intro {
    margin-bottom: var(--spacing-md, 1rem);
    color: var(--text-secondary, rgba(255, 255, 255, 0.7));
    font-size: 0.9rem;
}

.notation-moves-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm, 0.75rem);
    margin-bottom: var(--spacing-md, 1rem);
}

.notation-move-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm, 0.75rem);
    padding: var(--spacing-xs, 0.5rem);
    background: var(--bg-secondary, rgba(255, 255, 255, 0.02));
    border-radius: 4px;
}

.notation-symbol {
    font-family: 'Courier New', monospace;
    font-size: 1rem;
    font-weight: bold;
    color: var(--accent-primary, #00d4ff);
    min-width: 3rem;
    text-align: center;
    background: var(--bg-tertiary, rgba(0, 212, 255, 0.1));
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

.notation-explanation {
    flex: 1;
    color: var(--text-primary, #ffffff);
    font-size: 0.9rem;
    line-height: 1.5;
}

.notation-help-footer {
    margin-top: var(--spacing-md, 1rem);
    padding-top: var(--spacing-md, 1rem);
    border-top: 1px solid var(--border-color, rgba(255, 255, 255, 0.1));
}

.notation-guide-link {
    color: var(--accent-primary, #00d4ff);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

.notation-guide-link:hover {
    color: var(--accent-secondary, #ffb800);
    text-decoration: underline;
}

/* Kids Mode Adjustments */
body.kids-mode .notation-help-toggle, html.kids-mode .notation-help-toggle {
    font-size: 1rem;
    padding: var(--spacing-md, 1rem);
}

body.kids-mode .notation-symbol, html.kids-mode .notation-symbol {
    font-size: 1.1rem;
    padding: 0.4rem 0.6rem;
}

body.kids-mode .notation-explanation, html.kids-mode .notation-explanation {
    font-size: 1rem;
}

/* Notation Table Styles */
.notation-table-container {
    overflow-x: auto;
    margin: var(--spacing-lg, 1.5rem) 0;
}

.notation-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-card, rgba(255, 255, 255, 0.05));
    border-radius: var(--border-radius, 8px);
    overflow: hidden;
}

.notation-table thead {
    background: var(--bg-elevated, rgba(255, 255, 255, 0.08));
}

.notation-table th {
    padding: var(--spacing-md, 1rem);
    text-align: left;
    color: var(--text-primary, #ffffff);
    font-weight: 600;
    border-bottom: 2px solid var(--border-color, rgba(255, 255, 255, 0.1));
}

.notation-table td {
    padding: var(--spacing-md, 1rem);
    color: var(--text-secondary, rgba(255, 255, 255, 0.7));
    border-bottom: 1px solid var(--border-color, rgba(255, 255, 255, 0.05));
}

.notation-table tr:hover {
    background: var(--bg-hover, rgba(255, 255, 255, 0.03));
}

.notation-table code {
    font-family: 'Courier New', monospace;
    color: var(--accent-primary, #00d4ff);
    font-weight: bold;
    background: var(--bg-tertiary, rgba(0, 212, 255, 0.1));
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

/* Algorithm Walkthrough Styles */
.algorithm-walkthrough {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md, 1rem);
    margin: var(--spacing-lg, 1.5rem) 0;
}

.walkthrough-step {
    padding: var(--spacing-md, 1rem);
    background: var(--bg-card, rgba(255, 255, 255, 0.05));
    border-left: 3px solid var(--accent-primary, #00d4ff);
    border-radius: 4px;
}

.walkthrough-step strong {
    display: block;
    font-family: 'Courier New', monospace;
    font-size: 1.2rem;
    color: var(--accent-primary, #00d4ff);
    margin-bottom: var(--spacing-xs, 0.5rem);
}

.walkthrough-step p {
    margin: 0;
    color: var(--text-secondary, rgba(255, 255, 255, 0.7));
}

body.kids-mode .walkthrough-step, html.kids-mode .walkthrough-step {
    border-left-color: var(--accent-kids, #ffd700);
}

body.kids-mode .walkthrough-step, html.kids-mode .walkthrough-step strong {
    color: var(--accent-kids, #ffd700);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .notation-move-item {
        flex-direction: column;
        gap: var(--spacing-xs, 0.5rem);
    }
    
    .notation-symbol {
        min-width: auto;
        width: fit-content;
    }
    
    .notation-table {
        font-size: 0.9rem;
    }
    
    .notation-table th,
    .notation-table td {
        padding: var(--spacing-sm, 0.75rem);
    }
}

/* Explore Features Section */
.explore-features {
    margin: var(--spacing-xxl, 4rem) 0;
    padding: var(--spacing-xl, 2rem) 0;
}

.explore-features-header {
    text-align: center;
    margin-bottom: var(--spacing-xl, 2rem);
}

.explore-features-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--text-primary, #ffffff);
    margin-bottom: var(--spacing-sm, 0.75rem);
    line-height: 1.2;
}

.explore-features-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-secondary, rgba(255, 255, 255, 0.7));
    margin: 0;
}

.explore-features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md, 1rem);
    max-width: 1200px;
    margin: 0 auto;
}

/* Mobile: 1 column */
@media (max-width: 767px) {
    .explore-features-grid {
        grid-template-columns: 1fr;
    }
}

/* Tablet and up: Always 3 columns */
@media (min-width: 768px) {
    .explore-features-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-lg, 1.5rem);
    }
}

.explore-feature-card {
    background: var(--bg-card, rgba(255, 255, 255, 0.05));
    border: 1px solid var(--border-color, rgba(255, 255, 255, 0.1));
    border-radius: var(--border-radius, 12px);
    padding: var(--spacing-lg, 1.5rem);
    min-height: 240px;
    display: flex;
    flex-direction: column;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.explore-feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-primary, #00d4ff), var(--accent-secondary, #ffb800));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.explore-feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-primary, #00d4ff);
    box-shadow: 0 8px 24px rgba(0, 212, 255, 0.15);
}

.explore-feature-card:hover::before {
    opacity: 1;
}

.explore-feature-icon {
    width: 64px;
    height: 64px;
    margin-bottom: var(--spacing-md, 1rem);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.explore-feature-icon svg {
    width: 100%;
    height: 100%;
}

.explore-feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary, #ffffff);
    margin: 0 0 var(--spacing-sm, 0.75rem) 0;
    line-height: 1.3;
}

.explore-feature-description {
    font-size: 0.95rem;
    color: var(--text-secondary, rgba(255, 255, 255, 0.7));
    margin: 0 0 var(--spacing-md, 1rem) 0;
    line-height: 1.5;
    flex-grow: 1;
}

.explore-feature-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm, 0.75rem) var(--spacing-md, 1rem);
    background: transparent;
    border: 1px solid var(--accent-primary, #00d4ff);
    border-radius: var(--border-radius, 8px);
    color: var(--accent-primary, #00d4ff);
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
    width: fit-content;
    margin-top: auto;
}

.explore-feature-btn:hover {
    background: var(--accent-primary, #00d4ff);
    color: var(--bg-primary, #1e1e1e);
    transform: translateX(4px);
}

.explore-feature-btn:focus {
    outline: 2px solid var(--accent-primary, #00d4ff);
    outline-offset: 2px;
}

.explore-feature-btn-kids {
    border-color: var(--accent-kids, #ffd700);
    color: var(--accent-kids, #ffd700);
}

.explore-feature-btn-kids:hover {
    background: var(--accent-kids, #ffd700);
    color: var(--bg-primary, #1e1e1e);
}

/* Kids Mode Adjustments */
body.kids-mode .explore-feature-card, html.kids-mode .explore-feature-card {
    border-color: rgba(255, 215, 0, 0.3);
}

body.kids-mode .explore-feature-card, html.kids-mode .explore-feature-card:hover {
    border-color: var(--accent-kids, #ffd700);
    box-shadow: 0 8px 24px rgba(255, 215, 0, 0.2);
}

body.kids-mode .explore-feature-card, html.kids-mode .explore-feature-card::before {
    background: linear-gradient(90deg, var(--accent-kids, #ffd700), var(--accent-kids-dark, #ffb300));
}

body.kids-mode .explore-feature-title, html.kids-mode .explore-feature-title {
    color: var(--text-primary, #ffffff);
}

/* Mobile Touch Optimization */
@media (max-width: 479px) {
    .explore-feature-card {
        min-height: 200px;
        padding: var(--spacing-md, 1rem);
    }
    
    .explore-feature-icon {
        width: 56px;
        height: 56px;
        margin-bottom: var(--spacing-sm, 0.75rem);
    }
    
    .explore-feature-title {
        font-size: 1.1rem;
    }
    
    .explore-feature-description {
        font-size: 0.9rem;
    }
    
    .explore-feature-btn {
        padding: var(--spacing-sm, 0.75rem) var(--spacing-md, 1rem);
        font-size: 0.9rem;
        min-height: 44px; /* Touch target size */
    }
}

/* Accessibility: High contrast mode support */
@media (prefers-contrast: high) {
    .explore-feature-card {
        border-width: 2px;
    }
    
    .explore-feature-btn {
        border-width: 2px;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .explore-feature-card {
        transition: none;
    }
    
    .explore-feature-card:hover {
        transform: none;
    }
    
    .explore-feature-btn:hover {
        transform: none;
    }
}

/* Mobile Card Fixes - Prevent Narrow Cards */
@media (max-width: 479px) {
    /* Force full width for all cards on mobile */
    .card,
    .feature-card,
    .algorithm-card,
    .path-card,
    .explore-feature-card {
        min-width: 100% !important;
        width: 100% !important;
        max-width: 100% !important;
        padding: 1rem !important; /* 16px minimum */
        flex-direction: column !important;
    }
    
    /* Prevent nested grids from shrinking cards */
    .feature-grid,
    .explore-features-grid,
    .paths-grid,
    .stage-algorithms {
        grid-template-columns: 1fr !important;
        gap: 1rem !important;
    }
    
    /* Increase vertical spacing instead of horizontal */
    .feature-grid > *,
    .explore-features-grid > *,
    .paths-grid > * {
        margin-bottom: 1rem;
    }
    
    /* Algorithm card readability improvements */
    .algorithm-card,
    .algorithm-card-content {
        font-size: 1rem !important; /* +1px from base */
        line-height: 1.6 !important; /* Minimum 1.6 */
    }
    
    .algorithm-card-title {
        font-size: 1.1rem !important;
        line-height: 1.5 !important;
    }
    
    .algorithm-moves {
        font-size: 0.95rem !important;
        line-height: 1.6 !important;
    }
    
    /* Ensure text doesn't wrap into unreadable lines */
    .card p,
    .feature-card p,
    .algorithm-card p,
    .path-card p {
        min-width: 0;
        word-wrap: break-word;
        overflow-wrap: break-word;
        hyphens: auto;
    }
    
    /* Prevent text clipping */
    .card h2,
    .card h3,
    .feature-card h3,
    .algorithm-card-title {
        word-wrap: break-word;
        overflow-wrap: break-word;
    }
}

/* Tablet adjustments - prevent card squeezing */
@media (min-width: 480px) and (max-width: 767px) {
    .card,
    .feature-card,
    .algorithm-card,
    .path-card {
        padding: 1.25rem !important; /* 20px */
        min-width: 0;
    }
    
    /* Ensure 2-column grids don't squeeze */
    .feature-grid,
    .explore-features-grid {
        gap: 1.25rem !important;
    }
}

/* Font contrast improvements for dark mode - Using CSS Variables */
body {
    color: var(--text-primary) !important; /* Pure white for body text */
}

body p,
body li,
body span:not(.accent),
body .text-content {
    color: var(--text-primary) !important;
}

body .text-secondary {
    color: var(--text-secondary) !important; /* High contrast secondary: rgba(255,255,255,0.85) */
}

body .text-muted,
body .meta-text {
    color: var(--text-muted) !important; /* Muted text: rgba(255,255,255,0.7) */
}

body small:not(.accent) {
    color: var(--text-muted) !important; /* Small text: rgba(255,255,255,0.7) */
}

/* Kids mode remains colorful */
body.kids-mode,
html.kids-mode {
    color: var(--text-primary) !important;
}

body.kids-mode .text-secondary, html.kids-mode .text-secondary {
    color: var(--text-secondary) !important; /* Consistent with design system */
}

/* Algorithm page text improvements */
.algorithm-card-content,
.algorithm-moves,
.algorithm-recognition {
    color: var(--text-primary) !important;
    line-height: 1.6 !important;
}

/* Card content readability - Card descriptions use secondary for better hierarchy */
.card p,
.card li,
.feature-card p,
.algorithm-card p,
.path-card p {
    color: var(--text-secondary) !important; /* rgba(255,255,255,0.85) for WCAG AA */
}

/* Editorial content - paragraphs and descriptions */
.editorial-content p,
.article-content p,
.content-page p,
.lead,
.subtitle {
    color: var(--text-secondary) !important; /* rgba(255,255,255,0.85) */
}

/* Practice stats labels - already using var(--text-secondary) but ensure consistency */
.practice-stats .stat-label,
.stats-label,
.stat-label {
    color: var(--text-secondary) !important; /* rgba(255,255,255,0.85) */
}

/* Muted text - for less important information */
.meta-text,
.text-muted,
.muted,
small:not(.accent) {
    color: var(--text-muted) !important; /* rgba(255,255,255,0.7) for improved readability */
}
    line-height: 1.6 !important;
}

/* Mobile-specific algorithm card improvements */
@media (max-width: 479px) {
    .algorithm-card-content {
        font-size: 1rem !important;
        line-height: 1.7 !important; /* Extra line height for mobile */
    }
    
    .algorithm-moves code {
        font-size: 0.95rem !important;
        line-height: 1.6 !important;
        padding: 0.5rem !important;
    }
    
    /* Ensure minimum touch target sizes */
    .card a,
    .card button,
    .algorithm-card a,
    .algorithm-card button {
        min-height: 44px;
        padding: 0.75rem 1rem;
    }
}

/* ========================================
   PRACTICE PAGE - MOBILE ALGORITHM DISPLAY FIX
   ======================================== */
@media (max-width: 767px) {
  /* Fix algorithm notation on practice page - prevent vertical stacking */
  .case-algorithm .algorithm-notation,
  .random-trainer .algorithm-notation,
  .case-display .algorithm-notation {
    font-size: 1.1rem !important; /* Minimum readable size */
    line-height: 1.8 !important;
    white-space: pre-wrap !important; /* Preserve spaces but allow wrapping */
    word-wrap: normal !important; /* Don't break words unnecessarily */
    overflow-wrap: normal !important;
    word-break: normal !important; /* Normal word breaking (keeps moves together) */
    text-align: left !important; /* Left align for better readability */
    padding: var(--spacing-md) !important;
    word-spacing: 0.3em !important; /* Space between algorithm moves */
    letter-spacing: 0.05em !important;
    min-height: 60px !important; /* Minimum height to prevent shrinking */
    display: block !important;
    width: 100% !important;
    max-width: 100% !important;
    min-width: 0 !important; /* Allow flex shrinking */
    overflow-x: auto !important; /* Allow horizontal scroll if needed */
    overflow-y: visible !important;
    -webkit-overflow-scrolling: touch !important; /* Smooth scrolling on iOS */
    scrollbar-width: thin !important; /* Thin scrollbar */
    box-sizing: border-box !important; /* Include padding in width */
  }
  
  /* Ensure algorithm notation container doesn't shrink */
  .case-algorithm {
    min-width: 0 !important; /* Allow flex shrinking */
    width: 100% !important;
    overflow: visible !important;
  }
  
  /* Fix case-display container */
  .case-display {
    padding: var(--spacing-md) !important;
    min-width: 0 !important;
    width: 100% !important;
    overflow-x: visible !important;
  }
  
  /* Fix random-trainer container */
  .random-trainer {
    padding: var(--spacing-md) !important;
    min-width: 0 !important;
    width: 100% !important;
    overflow-x: visible !important;
  }
  
  /* Ensure trainer-content doesn't constrain */
  .trainer-content {
    min-width: 0 !important;
    width: 100% !important;
    overflow-x: visible !important;
  }
  
  /* Fix case-visual container */
  .case-visual {
    min-width: 0 !important;
    width: 100% !important;
    overflow-x: visible !important;
  }
  
  /* Algorithm notation scrollbar styling */
  .algorithm-notation::-webkit-scrollbar {
    height: 6px !important;
  }
  
  .algorithm-notation::-webkit-scrollbar-track {
    background: var(--bg-primary) !important;
    border-radius: 3px !important;
  }
  
  .algorithm-notation::-webkit-scrollbar-thumb {
    background: var(--accent-primary) !important;
    border-radius: 3px !important;
  }
  
  .algorithm-notation::-webkit-scrollbar-thumb:hover {
    background: var(--accent-secondary) !important;
  }
}