:root {
    --font-size: 15px;
    
    /* Social Media Inspired Color System */
    --background: #000000;
    --foreground: #ffffff;
    --card: #16181c;
    --card-foreground: #ffffff;
    --popover: #16181c;
    --popover-foreground: #ffffff;
    --primary: #1d9bf0;
    --primary-foreground: #ffffff;
    --secondary: #1c1f23;
    --secondary-foreground: #ffffff;
    --muted: #202327;
    --muted-foreground: #71767b;
    --accent: #f91880;
    --accent-foreground: #ffffff;
    --destructive: #f4212e;
    --destructive-foreground: #ffffff;
    --border: #2f3336;
    --input: #16181c;
    --input-background: #000000;
    --switch-background: #2f3336;
    --ring: #1d9bf0;
    --radius: 1rem;
    
    /* Enhanced Gradients */
    --gradient-primary: linear-gradient(135deg, #1d9bf0 0%, #1a8cd8 100%);
    --gradient-blue: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    --gradient-green: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --gradient-purple: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
    --gradient-orange: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    --gradient-red: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    
    /* Glass Effects */
    --glass-bg: rgba(22, 24, 28, 0.75);
    --glass-border: rgba(47, 51, 54, 0.5);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    
    /* Engagement Colors */
    --retweet-green: #00ba7c;
    --bookmark-yellow: #ffd400;
    
    /* Surface Colors */
    --surface-card: #16181c;
    --surface-hover: #1c1f23;
    --surface-active: #202327;
    
    /* Text Colors */
    --text-primary: #e7e9ea;
    --text-secondary: #71767b;
    --text-muted: #51565d;
    
    /* Interactive Elements */
    --interactive-hover: rgba(29, 155, 240, 0.1);
  }
  
  .light {
    --background: #fceec2;
    --foreground: #0f1419;
    --card: #ffffff;
    --card-foreground: #0f1419;
    --primary: #1d9bf0;
    --muted: #f7f9fa;
    --muted-foreground: #536471;
    --border: #eff3f4;
    --surface-card: #fceec2;
    --surface-hover: #f7f9fa;
    --text-primary: #0f1419;
    --text-secondary: #536471;
    --text-muted: #657786;
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(239, 243, 244, 0.5);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    

  }
  
  /* LIGHT MODE FIX */
  
.light .screen,
.light .quiz-header,
.light .quiz-content,
.light .results-content {
  background-color: var(--surface-card); /* light background */
  color: var(--text-primary);
}

/* Optional: style for options if not already themed */
.light .quiz-option,
.light .option-container {
  background-color: #ffffff;
  color: var(--text-primary);
  border: 1px solid var(--border);
}

/* Hover/focus effect for light mode */
.light .quiz-option:hover,
.light .option-container:hover {
  background-color: var(--surface-hover);
}

  /* Light mode header */
.light .header {
  background: rgba(255, 255, 255, 0.6);  /* semi-transparent white */
  backdrop-filter: blur(15px);          /* smooth blend */
  box-shadow: none;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

/* Light mode footer */
.light .footer {
  background: rgba(255, 255, 255, 0.6);  /* matches page background */
  backdrop-filter: blur(15px);
  box-shadow: none;
  border-top: 1px solid rgba(0, 0, 0, 0.05);
}

  
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  

  
  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--background);
    color: var(--foreground);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }
  
  /* Background Animation */
  body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
      radial-gradient(circle at 20% 50%, rgba(29, 155, 240, 0.1) 0%, transparent 40%),
      radial-gradient(circle at 80% 20%, rgba(16, 185, 129, 0.1) 0%, transparent 40%),
      radial-gradient(circle at 40% 80%, rgba(249, 24, 128, 0.1) 0%, transparent 40%);
    z-index: -1;
  }
  
  /* Theme Toggle */
  .theme-toggle {
    position: absolute;
    top: 0.75rem;
    right: 1rem;
    background: var(--surface-card);
    border: 1px solid var(--border);
    border-radius: 2rem;
    padding: 0.5rem 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--muted-foreground);
    transition: all 0.3s ease;
    z-index: 1000;
    font-size: 0.875rem;


  }
  
  .theme-toggle:hover {
    border-color: var(--primary);
    color: var(--primary);
  }
  
  /* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 4.5rem;
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 2rem;
  transition: background-color 0.3s ease;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

/* Dark Mode Header - Glassmorphism */
.dark .header {
  background: rgba(22, 24, 28, 0.95); /* dark frosted glass look */
  border-bottom: 1px solid var(--border);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

  
  
  .header-content {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1rem;
  }
  
  .header-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }
  
  .brand-icon {
    width: 2rem;
    height: 2rem;
    border-radius: 0.5rem;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
  }
  
  .brand-icon svg {
    width: 1.25rem;
    height: 1.25rem;
  }
  
  .brand-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--foreground);
    margin: 0;
  }
  
  .brand-subtitle {
    font-size: 0.75rem;
    color: var(--muted-foreground);
    margin: 0;
  }
  
  /* Main Container */
  .main-container {
    max-width: 56rem;
    margin: 0 auto;
    min-height: 100vh;
    position: relative;
  }
  
  .content-wrapper {
    padding-top: 5rem;
  }
  
  /* Screen Management */
  .screen {
    display: none;
    animation: fadeIn 0.5s ease-out;
  }
  
  .screen.active {
    display: block;
  }
  
  @keyframes fadeIn {
    from {
      opacity: 0;
      transform: translateY(20px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
  
  /* Quiz Home Screen */
  .quiz-home-content {
    max-width: 72rem;
    margin: 0 auto;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
  }
  
  /* Hero Section */
  .hero-section {
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }
  
  .hero-icons {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
  }
  
  .hero-icon {
    width: 4rem;
    height: 4rem;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
  }
  
  .hero-icon-1 {
    background: var(--gradient-primary);
  }
  
  .hero-icon-2 {
    background: var(--gradient-blue);
  }
  
  .hero-icon-3 {
    background: var(--gradient-green);
  }
  
  .hero-icon svg {
    width: 2rem;
    height: 2rem;
  }
  
  .hero-text {
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }
  
  .hero-title {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(to right, var(--primary), var(--accent), #8b5cf6);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin: 0;
  }
  
  .hero-description {
    font-size: 1.25rem;
    color: var(--muted-foreground);
    max-width: 42rem;
    margin: 0 auto;
    line-height: 1.6;
  }
  
  .stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1.5rem;
  max-width: 100rem;
  justify-items: center;
}

  .stat-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: 0.75rem;
    padding: 1rem;
    text-align: center;
  }
  
  .stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
  }
  
  .stat-label {
    font-size: 0.875rem;
    color: var(--muted-foreground);
  }
  
  /* Categories Section */
  .categories-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }
  
  .section-header {
    text-align: center;
  }
  
  .section-title {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--foreground);
    margin: 0 0 0.5rem 0;
  }
  
  .section-subtitle {
    color: var(--muted-foreground);
    margin: 0;
  }
  
  .categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
  }
  
  .category-card {
    background: var(--surface-card);
    border: 1px solid var(--border);
    border-radius: 1rem;
    padding: 2rem;
    cursor: pointer;
    transition: all 0.3s ease;
  }
  
  .category-card:hover {
    background: var(--surface-hover);
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--glass-shadow);
  }
  
  .category-header {
    display: flex;
    align-items: start;
    gap: 1rem;
    margin-bottom: 1.5rem;
  }
  
  .category-icon {
    width: 4rem;
    height: 4rem;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
    transition: transform 0.3s ease;
  }
  
  .category-card:hover .category-icon {
    transform: scale(1.1);
  }
  
  .category-icon svg {
    width: 1.75rem;
    height: 1.75rem;
  }
  
  .category-info {
    flex: 1;
    min-width: 0;
  }
  
  .category-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--foreground);
    margin: 0 0 0.5rem 0;
  }
  
  .category-description {
    color: var(--muted-foreground);
    line-height: 1.6;
    margin: 0;
  }
  
  .category-meta {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1rem;
  }
  
  .meta-item {
    text-align: center;
  }
  
  .meta-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    color: var(--muted-foreground);
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
  }
  
  .meta-icon svg {
    width: 1rem;
    height: 1rem;
  }
  
  .meta-label {
    font-size: 0.75rem;
    color: var(--muted-foreground);
  }
  
  .category-topics {
    margin-bottom: 1.5rem;
  }
  
  .topics-title {
    font-weight: 500;
    color: var(--foreground);
    margin: 0 0 0.75rem 0;
  }
  
  .topics-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  
  .topic-tag {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    background: var(--surface-hover);
    font-size: 0.875rem;
    color: var(--muted-foreground);
  }
  
  .category-action {
    width: 100%;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 0.9375rem;
    cursor: pointer;
    transition: all 0.3s ease;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
  }
  
  .category-action:hover {
    opacity: 0.9;
    box-shadow: var(--glass-shadow);
  }
  
  .category-action svg {
    width: 1rem;
    height: 1rem;
  }
  
  .badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
    border: 1px solid;
  }
  
  .badge-beginner {
    background: rgba(16, 185, 129, 0.1);
    color: #10b981;
    border-color: rgba(16, 185, 129, 0.3);
  }
  
  .badge-intermediate {
    background: rgba(59, 130, 246, 0.1);
    color: #3b82f6;
    border-color: rgba(59, 130, 246, 0.3);
  }
  
  .badge-advanced {
    background: rgba(139, 92, 246, 0.1);
    color: #8b5cf6;
    border-color: rgba(139, 92, 246, 0.3);
  }
  
  .badge-expert {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border-color: rgba(239, 68, 68, 0.3);
  }
  
  /* Features Section */
  .features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
  }
  
  .feature-card {
    background: var(--surface-card);
    border: 1px solid var(--border);
    border-radius: 1rem;
    padding: 1.5rem;
    text-align: center;
    transition: all 0.2s ease;
  }
  
  .feature-card:hover {
    background: var(--surface-hover);
    transform: translateY(-2px);
  }
  
  .feature-icon {
    width: 3rem;
    height: 3rem;
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem auto;
    color: white;
  }
  
  .feature-icon-1 {
    background: var(--gradient-primary);
  }
  
  .feature-icon-2 {
    background: var(--gradient-green);
  }
  
  .feature-icon-3 {
    background: var(--gradient-purple);
  }
  
  .feature-icon svg {
    width: 1.5rem;
    height: 1.5rem;
  }
  
  .feature-title {
    font-weight: 600;
    color: var(--foreground);
    margin: 0 0 0.5rem 0;
  }
  
  .feature-description {
    font-size: 0.875rem;
    color: var(--muted-foreground);
    margin: 0;
  }
  
  /* Tips Section */
  .tips-section {
    background: var(--surface-card);
    border: 1px solid var(--border);
    border-radius: 1rem;
    padding: 2rem;
  }
  
  .tips-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--foreground);
    text-align: center;
    margin: 0 0 1.5rem 0;
  }
  
  .tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
  }
  
  .tips-column {
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }
  
  .tip-item {
    display: flex;
    align-items: start;
    gap: 0.75rem;
  }
  
  .tip-number {
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 0.125rem;
  }
  
  .tip-number-1 {
    background: var(--primary);
  }
  
  .tip-number-2 {
    background: var(--accent);
  }
  
  .tip-number-3 {
    background: var(--retweet-green);
  }
  
  .tip-number-4 {
    background: var(--bookmark-yellow);
  }
  
  .tip-content {
    flex: 1;
  }
  
  .tip-title {
    font-weight: 500;
    color: var(--foreground);
    margin: 0 0 0.25rem 0;
  }
  
  .tip-description {
    font-size: 0.875rem;
    color: var(--muted-foreground);
    margin: 0;
  }
  
  /* Quiz Screen */
  .quiz-header {
    position: sticky;
    top: 5rem;
    background: rgba(22, 24, 28, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    z-index: 30;
    
  }
  
  .quiz-content {
    max-width: 56rem;
    margin: 0 auto;
    padding: 1.5rem;
  }
  
  .quiz-header-content {
    max-width: 56rem;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
  }
  
  .quiz-nav {
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }
  
  .back-button {
    padding: 0.5rem;
    background: none;
    border: none;
    border-radius: 9999px;
    color: var(--muted-foreground);
    cursor: pointer;
    transition: background 0.2s ease;
  }
  
  .back-button:hover {
    background: var(--surface-hover);
  }
  
  .back-button svg {
    width: 1.25rem;
    height: 1.25rem;
  }
  
  .quiz-title-section {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }
  
  .quiz-title-section svg {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--accent);
  }
  
  .quiz-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--foreground);
    margin: 0;
  }
  
  .quiz-timer {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--muted-foreground);
  }
  
  .quiz-timer svg {
    width: 1rem;
    height: 1rem;
  }
  
  .quiz-timer.warning {
    color: var(--destructive);
  }
  
  .progress-section {
    max-width: 56rem;
    margin: 0 auto;
    padding: 0 1rem 1rem;
  }
  
  .progress-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    color: var(--muted-foreground);
  }
  
  .progress-bar {
    width: 100%;
    height: 0.5rem;
    background: var(--muted);
    border-radius: 9999px;
    overflow: hidden;
  }
  
  .progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 9999px;
    transition: width 0.3s ease;
  }
  
  /* Question Card */
  .question-card {
    background: var(--surface-card);
    border: 1px solid var(--border);
    border-radius: 1rem;
    padding: 2rem;
    margin-bottom: 1.5rem;
    
    
  }
  
  
  .question-header {
    display: flex;
    align-items: start;
    gap: 1rem;
    margin-bottom: 1.5rem;
    
  }
  
  .question-number {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    flex-shrink: 0;
  }
  
  .question-text {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--foreground);
    line-height: 1.6;
    margin: 0;
  }
  
  .options-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }
  
  .quiz-option {
    width: 100%;
    padding: 1.5rem;
    border-radius: 0.75rem;
    border: 2px solid var(--border);
    background: transparent;
    color: var(--foreground);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
  }
  
  .quiz-option:hover:not(:disabled) {
    border-color: var(--muted-foreground);
  }
  
  .quiz-option.selected {
    border-color: var(--primary);
    background: rgba(29, 155, 240, 0.1);
  }
  
  .quiz-option.correct {
    border-color: var(--retweet-green);
    background: rgba(0, 186, 124, 0.1);
  }
  
  .quiz-option.incorrect {
    border-color: var(--destructive);
    background: rgba(244, 33, 46, 0.1);
  }
  
  .quiz-option:disabled {
    cursor: not-allowed;
  }
  
  .option-content {
    display: flex;
    align-items: center;
    gap: 1rem;
  }
  
  .option-indicator {
    width: 2rem;
    height: 2rem;
    border: 2px solid var(--muted-foreground);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }
  
  .option-indicator.selected {
    border-color: var(--primary);
    background: var(--primary);
  }
  
  .option-indicator.correct {
    border-color: var(--retweet-green);
    background: var(--retweet-green);
  }
  
  .option-indicator.incorrect {
    border-color: var(--destructive);
    background: var(--destructive);
  }
  
  .option-dot {
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    background: white;
  }
  
  .option-text {
    font-weight: 500;
    font-size: 1.125rem;
  }
  
  .explanation-section {
    margin-top: 2rem;
    padding: 1.5rem;
    border-radius: 0.75rem;
    background: var(--surface-hover);
    border: 1px solid var(--border);
  }
  
  .explanation-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
  }
  
  .explanation-header svg {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--primary);
  }
  
  .explanation-title {
    font-weight: 600;
    color: var(--foreground);
    font-size: 1.125rem;
    margin: 0;
  }
  
  .explanation-text {
    color: var(--muted-foreground);
    line-height: 1.6;
    font-size: 1.125rem;
    margin: 0;
  }
  
  .quiz-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 0.9375rem;
    cursor: pointer;
    transition: all 0.3s ease;
    gap: 0.5rem;
  }
  
  .btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
  }
  
  .btn-primary {
    background: var(--gradient-primary);
    color: white;
  }
  
  .btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 16px 32px rgba(1, 4, 9, 0.85);
  }
  
  .btn-secondary {
    background: var(--surface-card);
    color: var(--foreground);
    border: 1px solid var(--border);
  }
  
  .btn-secondary:hover:not(:disabled) {
    background: var(--surface-hover);
    border-color: var(--primary);
  }
  
  .btn svg {
    width: 1rem;
    height: 1rem;
  }
  
  /* Results Screen */
  
  .results-header {
    position: static;
    top: 5rem;
    background: rgba(22, 24, 28, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    z-index: 30;
    margin: -1.5rem -1.5rem 2rem -1.5rem;
    padding: 1rem 1.5rem;
    background-color: #ffffff;
  }
  
  .results-header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    
    
  }
  
  .results-nav {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    
    
  }
  
  .results-nav svg {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--bookmark-yellow);
  }
  
  .results-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--foreground);
    margin: 0;
    
    
  }
  
  .results-content {
    max-width: 56rem;
    margin: 0 auto;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    
  }
  
  .score-card {
    background: var(--surface-card);
    border: 1px solid var(--border);
    border-radius: 1rem;
    padding: 1rem;
    text-align: center;
  }
  
  .score-icon {
    width: 6rem;
    height: 6rem;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem auto;
    color: white;
  }
  
  .score-icon svg {
    width: 2.5rem;
    height: 2.5rem;
  }
  
  .score-message {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin: 0 0 0.75rem 0;
  }
  
  .score-subtitle {
    color: var(--muted-foreground);
    font-size: 1.125rem;
    margin: 0 0 2rem 0;
  }
  
  .score-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 3rem;
    margin-bottom: 2rem;
  }
  
  .score-stat {
    text-align: center;
  }
  
  .score-value {
    font-size: 3.125rem;
    font-weight: 700;
  }
  
  .score-label {
    font-size: 0.875rem;
    color: var(--muted-foreground);
    margin-top: 0.25rem;
  }
  
  .score-info {
    text-align: center;
    color: var(--muted-foreground);
  }
  
  .score-category {
    font-weight: 600;
    color: var(--foreground);
    font-size: 1.125rem;
  }
  
  .stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
  
  .stat-card {
    background: var(--surface-card);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1.5rem;
  }
  
  .stat-content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }
  
  .stat-icon {
    width: 3rem;
    height: 3rem;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .stat-icon svg {
    width: 1.5rem;
    height: 1.5rem;
  }
  
  .stat-data {
    flex: 1;
  }
  
  .stat-number {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--foreground);
  }
  
  .stat-name {
    font-size: 0.875rem;
    color: var(--muted-foreground);
  }
  
  .progress-breakdown {
    background: var(--surface-card);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1.5rem;
  }
  
  .breakdown-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
  }
  
  .breakdown-header svg {
    width: 1.5rem;
    height: 1.5rem;
    color: var(--primary);
  }
  
  .breakdown-title {
    font-weight: 600;
    color: var(--foreground);
    font-size: 1.25rem;
    margin: 0;
  }
  
  .breakdown-items {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }
  
  .breakdown-item {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
  }
  
  .breakdown-info {
    display: flex;
    justify-content: between;
    align-items: center;
  }
  
  .breakdown-label {
    color: var(--muted-foreground);
  }
  
  .breakdown-value {
    font-weight: 500;
  }
  
  .progress-bar-lg {
    width: 100%;
    height: 0.75rem;
    background: var(--muted);
    border-radius: 9999px;
    overflow: hidden;
  }
  
  .progress-fill-lg {
    height: 100%;
    border-radius: 9999px;
    transition: width 0.3s ease;
  }
  
  .question-review {
    background: var(--surface-card);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1.5rem;
  }
  
  .review-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
  }
  
  .review-header svg {
    width: 1.5rem;
    height: 1.5rem;
    color: var(--accent);
  }
  
  .review-title {
    font-weight: 600;
    color: var(--foreground);
    font-size: 1.25rem;
    margin: 0;
  }
  
  .review-items {
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }
  
  .review-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    border-radius: 0.5rem;
    background: var(--surface-hover);
  }
  
  .review-content {
    display: flex;
    align-items: center;
    gap: 1rem;
  }
  
  .review-status {
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
  }
  
  .review-status.correct {
    background: var(--retweet-green);
  }
  
  .review-status.incorrect {
    background: var(--destructive);
  }
  
  .review-status svg {
    width: 1.25rem;
    height: 1.25rem;
  }
  
  .review-question {
    font-weight: 500;
    color: var(--foreground);
  }
  
  .actions-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }
  
  .actions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
  
  .footer {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100vw;
  height: 4.5rem;
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--border);
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.3s ease;
}

/* Dark Mode Footer */
.dark .footer {
  background: rgba(22, 24, 28, 0.95);
}




/* Add this one-time helper style */
body::after {
  content: "";
  display: block;
  height: 5rem; /* same as footer height */
}


  .footer-content {
  max-width: 72rem;           /* sets readable content width */
  margin: 0 auto;             /* centers it inside footer */
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

  .footer-text {
    font-size: 0.875rem;
    color: var(--muted-foreground);
    margin: 0;
  }
  
  .footer-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    font-size: 0.75rem;
    color: var(--muted-foreground);
  }
  
  
  /* Responsive Design */
  @media (min-width: 768px) {
    .stats-grid {
      grid-template-columns: repeat(4, 1fr);
    }
    
    .score-display {
      gap: 4rem;
    }
  }
  
  @media (max-width: 767px) {
    .quiz-home-content {
      padding: 1rem;
    }
    
    .hero-title {
      font-size: 2.25rem;
    }
    
    .hero-description {
      font-size: 1.125rem;
    }
    
    .categories-grid {
      grid-template-columns: 1fr;
    }
    
    .features-grid {
      grid-template-columns: 1fr;
    }
    
    .tips-grid {
      grid-template-columns: 1fr;
    }
    
    .quiz-content {
      padding: 1rem;
    }
    
    .results-content {
      padding: 1rem;
    }
    
    .score-display {
      gap: 2rem;
    }
    
    .quiz-actions {
      flex-direction: column;
      gap: 1rem;
    }
    
    .quiz-actions .btn {
      width: 100%;
    }
  }
  
  /* Scrollbar Styling */
  ::-webkit-scrollbar {
    width: 6px;
  }
  
  ::-webkit-scrollbar-track {
    background: transparent;
  }
  
  ::-webkit-scrollbar-thumb {
    background: var(--muted);
    border-radius: 3px;
  }
  
  ::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
  }
  
  html {
    font-size: var(--font-size);
    scroll-behavior: smooth;
  }
  
  /* Utility Classes */
  .hidden {
    display: none !important;
  }
  
  .text-correct {
    color: var(--retweet-green) !important;
  }
  
  .text-incorrect {
    color: var(--destructive) !important;
  }
  
  .text-primary-color {
    color: var(--primary) !important;
  }
  
  .text-accent-color {
    color: var(--accent) !important;
  }
  
  .text-warning {
    color: var(--bookmark-yellow) !important;
  }
  
  .bg-correct {
    background: rgba(0, 186, 124, 0.2) !important;
  }
  
  .bg-incorrect {
    background: rgba(244, 33, 46, 0.2) !important;
  }
  
  .bg-primary {
    background: rgba(29, 155, 240, 0.2) !important;
  }
  
  .bg-warning {
    background: rgba(255, 212, 0, 0.2) !important;
  }
  
  /* Back to Top Button */

#backToTopBtn {
  display: none;
  position: fixed;
  bottom: 40px;
  right: 40px;
  z-index: 999;
  font-size: 20px;
  background-color: #3b82f6;
  color: #f7f9fc;
  border: none;
  outline: none;
  padding: 12px 16px;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 4px 8px rgba(0,0,0,0.3);
  transition: opacity 0.3s ease;
  opacity: 0;
}
#backToTopBtn.show {
  display: block;
  opacity: 1;
}
#backToTopBtn:hover {
  background-color: #1e40af;
}