/* ============================================
   ApexTesting - Design System & Styles
   Premium Light Theme with Glassmorphism
   ============================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ============================================
   CSS Custom Properties (Design Tokens)
   ============================================ */
:root {
  /* Colors */
  --bg-primary: #f8f9fc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f0f1f5;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.95);
  --bg-glass: rgba(0, 0, 0, 0.02);
  --bg-glass-hover: rgba(0, 0, 0, 0.04);

  --border-color: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(0, 0, 0, 0.15);
  --border-accent: rgba(139, 92, 246, 0.3);

  --text-primary: #1a1a2e;
  --text-secondary: #555770;
  --text-muted: #8b8da3;
  --text-accent: #7c3aed;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #8b5cf6, #06b6d4);
  --gradient-secondary: linear-gradient(135deg, #ec4899, #8b5cf6);
  --gradient-success: linear-gradient(135deg, #10b981, #06b6d4);
  --gradient-danger: linear-gradient(135deg, #ef4444, #ec4899);
  --gradient-warning: linear-gradient(135deg, #f59e0b, #ef4444);
  --gradient-bg: linear-gradient(135deg, #f8f9fc 0%, #eef0f7 50%, #f8f9fc 100%);

  /* Accent Colors */
  --accent-purple: #7c3aed;
  --accent-cyan: #0891b2;
  --accent-pink: #db2777;
  --accent-green: #059669;
  --accent-red: #dc2626;
  --accent-yellow: #d97706;
  --accent-blue: #2563eb;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1);
  --shadow-glow-purple: 0 0 20px rgba(139, 92, 246, 0.12);
  --shadow-glow-cyan: 0 0 20px rgba(6, 182, 212, 0.12);
  --shadow-glow-pink: 0 0 20px rgba(236, 72, 153, 0.12);

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.8125rem;
  --font-size-base: 0.9375rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 0.875rem;
  --radius-xl: 1.25rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
  --transition-spring: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Layout */
  --sidebar-width: 260px;
  --sidebar-collapsed: 72px;
  --header-height: 64px;
}

/* ============================================
   Reset & Base
   ============================================ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Animated Background */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse 600px 400px at 20% 20%, rgba(139, 92, 246, 0.04) 0%, transparent 70%),
    radial-gradient(ellipse 500px 350px at 80% 80%, rgba(6, 182, 212, 0.03) 0%, transparent 70%),
    radial-gradient(ellipse 400px 300px at 50% 50%, rgba(236, 72, 153, 0.02) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

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

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
}

::selection {
  background: rgba(139, 92, 246, 0.2);
  color: var(--text-primary);
}

::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(139, 92, 246, 0.2);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(139, 92, 246, 0.35);
}

/* ============================================
   Layout
   ============================================ */
.app-layout {
  display: flex;
  min-height: 100vh;
  position: relative;
  z-index: 1;
}

/* ============================================
   Sidebar
   ============================================ */
.sidebar {
  width: var(--sidebar-width);
  height: 100vh;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-slow);
  overflow: hidden;
}

.sidebar-header {
  padding: var(--spacing-lg) var(--spacing-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
  min-height: var(--header-height);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo-icon {
  font-size: 1.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.logo-text {
  font-size: var(--font-size-xl);
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}

.sidebar-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: var(--spacing-xs);
  transition: color var(--transition-fast);
}

.sidebar-toggle:hover {
  color: var(--text-primary);
}

.nav-menu {
  list-style: none;
  padding: var(--spacing-md) var(--spacing-sm);
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  color: var(--text-secondary);
  font-weight: 500;
  font-size: var(--font-size-base);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.nav-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%) scaleY(0);
  width: 3px;
  height: 60%;
  background: var(--gradient-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: transform var(--transition-base);
}

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

.nav-item.active {
  background: rgba(139, 92, 246, 0.08);
  color: var(--text-primary);
}

.nav-item.active::before {
  transform: translateY(-50%) scaleY(1);
}

.nav-icon {
  font-size: 1.25rem;
  width: 28px;
  text-align: center;
  flex-shrink: 0;
}

.sidebar-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
}

.sidebar-footer-text {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  text-align: center;
}

/* ============================================
   Main Content
   ============================================ */
.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  padding: var(--spacing-2xl);
  min-height: 100vh;
  transition: margin-left var(--transition-slow);
  max-width: 1200px;
}

.view {
  display: none;
  animation: fadeIn 0.4s ease;
}

.view.active {
  display: block;
}

/* ============================================
   Page Header
   ============================================ */
.page-header {
  margin-bottom: var(--spacing-2xl);
}

.page-title {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  margin-bottom: var(--spacing-sm);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-subtitle {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  font-weight: 400;
}

/* ============================================
   Cards
   ============================================ */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
}

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

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

.card-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
}

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

/* ============================================
   Stats Grid
   ============================================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.stat-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base);
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.stat-card.purple::before { background: var(--gradient-primary); }
.stat-card.cyan::before { background: linear-gradient(90deg, #06b6d4, #10b981); }
.stat-card.pink::before { background: var(--gradient-secondary); }
.stat-card.green::before { background: var(--gradient-success); }

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

.stat-icon {
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--bg-glass);
}

.stat-value {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  line-height: 1;
  margin-bottom: var(--spacing-xs);
}

.stat-card.purple .stat-value { color: var(--accent-purple); }
.stat-card.cyan .stat-value { color: var(--accent-cyan); }
.stat-card.pink .stat-value { color: var(--accent-pink); }
.stat-card.green .stat-value { color: var(--accent-green); }

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition-base);
  white-space: nowrap;
  text-decoration: none;
  line-height: 1.4;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 2px 12px rgba(139, 92, 246, 0.25);
}

.btn-primary:hover {
  box-shadow: 0 4px 20px rgba(139, 92, 246, 0.4);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-glass);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-hover);
}

.btn-success {
  background: var(--gradient-success);
  color: white;
  box-shadow: 0 2px 12px rgba(16, 185, 129, 0.25);
}

.btn-success:hover {
  box-shadow: 0 4px 20px rgba(16, 185, 129, 0.4);
  transform: translateY(-1px);
}

.btn-danger {
  background: var(--gradient-danger);
  color: white;
  box-shadow: 0 2px 12px rgba(239, 68, 68, 0.25);
}

.btn-danger:hover {
  box-shadow: 0 4px 20px rgba(239, 68, 68, 0.4);
  transform: translateY(-1px);
}

.btn-warning {
  background: var(--gradient-warning);
  color: white;
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 0.5rem 0.75rem;
}

.btn-ghost:hover {
  background: var(--bg-glass);
  color: var(--text-primary);
}

.btn-lg {
  padding: 0.875rem 1.75rem;
  font-size: var(--font-size-md);
  border-radius: var(--radius-lg);
}

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: var(--font-size-xs);
}

.btn-icon {
  padding: 0.5rem;
  border-radius: var(--radius-md);
}

.btn-group {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

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

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  transition: all var(--transition-base);
  outline: none;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--accent-purple);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.15);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-muted);
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
}

.form-select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%239ca3af' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

.form-select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

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

.form-hint {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-top: var(--spacing-xs);
}

/* Radio / Checkbox custom */
.radio-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.radio-option {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: 0.75rem 1rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
}

.radio-option:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-hover);
}

.radio-option.selected {
  border-color: var(--accent-purple);
  background: rgba(139, 92, 246, 0.06);
}

.radio-option input[type="radio"] {
  display: none;
}

.radio-marker {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition-base);
}

.radio-option.selected .radio-marker {
  border-color: var(--accent-purple);
}

.radio-option.selected .radio-marker::after {
  content: '';
  width: 10px;
  height: 10px;
  background: var(--accent-purple);
  border-radius: 50%;
}

.radio-label {
  flex: 1;
  font-size: var(--font-size-base);
}

/* ============================================
   Quiz Option Styles (for taking quiz)
   ============================================ */
.quiz-option {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: 1rem 1.25rem;
  background: var(--bg-glass);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.quiz-option::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.quiz-option:hover {
  border-color: rgba(139, 92, 246, 0.3);
  transform: translateX(4px);
}

.quiz-option.selected {
  border-color: var(--accent-purple);
  background: rgba(139, 92, 246, 0.08);
}

.quiz-option.selected::before {
  opacity: 0.05;
}

.quiz-option.correct {
  border-color: var(--accent-green);
  background: rgba(16, 185, 129, 0.08);
}

.quiz-option.incorrect {
  border-color: var(--accent-red);
  background: rgba(239, 68, 68, 0.08);
}

.option-letter {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  flex-shrink: 0;
  transition: all var(--transition-base);
  position: relative;
  z-index: 1;
}

.quiz-option.selected .option-letter {
  background: var(--accent-purple);
  border-color: var(--accent-purple);
  color: white;
}

.quiz-option.correct .option-letter {
  background: var(--accent-green);
  border-color: var(--accent-green);
  color: white;
}

.quiz-option.incorrect .option-letter {
  background: var(--accent-red);
  border-color: var(--accent-red);
  color: white;
}

.option-text {
  flex: 1;
  font-size: var(--font-size-base);
  position: relative;
  z-index: 1;
}

/* ============================================
   Timer
   ============================================ */
.timer-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-xl);
}

.timer-icon {
  font-size: 1.5rem;
}

.timer-display {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  min-width: 80px;
}

.timer-display.warning {
  color: var(--accent-yellow);
  animation: pulse 1s infinite;
}

.timer-display.danger {
  color: var(--accent-red);
  animation: pulse 0.5s infinite;
}

.timer-bar-container {
  flex: 1;
  height: 8px;
  background: var(--bg-glass);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.timer-bar {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  transition: width 1s linear;
}

.timer-bar.warning {
  background: var(--gradient-warning);
}

.timer-bar.danger {
  background: var(--gradient-danger);
}

/* ============================================
   Question Navigation
   ============================================ */
.question-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) 0;
  margin-bottom: var(--spacing-lg);
}

.question-dot {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.question-dot:hover {
  border-color: var(--border-hover);
  background: var(--bg-glass-hover);
}

.question-dot.active {
  background: var(--accent-purple);
  border-color: var(--accent-purple);
  color: white;
  box-shadow: var(--shadow-glow-purple);
}

.question-dot.answered {
  background: rgba(16, 185, 129, 0.15);
  border-color: rgba(16, 185, 129, 0.3);
  color: var(--accent-green);
}

.question-dot.active.answered {
  background: var(--accent-green);
  border-color: var(--accent-green);
  color: white;
}

/* ============================================
   Question Card
   ============================================ */
.question-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  margin-bottom: var(--spacing-xl);
  animation: slideUp 0.3s ease;
}

.question-number {
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-purple);
  margin-bottom: var(--spacing-md);
}

.question-text {
  font-size: var(--font-size-xl);
  font-weight: 600;
  line-height: 1.6;
  margin-bottom: var(--spacing-xl);
}

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

/* ============================================
   Quiz List (for selection)
   ============================================ */
.quiz-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
}

.quiz-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  transition: all var(--transition-base);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.quiz-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-base);
}

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

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

.quiz-card-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.quiz-card-desc {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.quiz-card-meta {
  display: flex;
  gap: var(--spacing-lg);
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

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

/* ============================================
   Table
   ============================================ */
.table-container {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
}

.table th {
  padding: 0.875rem 1rem;
  text-align: left;
  font-weight: 700;
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  background: var(--bg-glass);
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.table th:hover {
  color: var(--text-primary);
}

.table th.sorted {
  color: var(--accent-purple);
}

.table td {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}

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

.table tr:hover td {
  background: var(--bg-glass);
  color: var(--text-primary);
}

/* ============================================
   Badges
   ============================================ */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.badge-purple {
  background: rgba(139, 92, 246, 0.15);
  color: var(--accent-purple);
}

.badge-green {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-green);
}

.badge-red {
  background: rgba(239, 68, 68, 0.15);
  color: var(--accent-red);
}

.badge-yellow {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-yellow);
}

.badge-cyan {
  background: rgba(6, 182, 212, 0.15);
  color: var(--accent-cyan);
}

/* ============================================
   Modal
   ============================================ */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
  animation: fadeIn 0.2s ease;
}

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

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUp 0.3s var(--transition-spring);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-xl);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  background: var(--bg-secondary);
  z-index: 10;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

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

.modal-close {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 1.25rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--bg-glass-hover);
  color: var(--text-primary);
}

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

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-sm);
  padding: var(--spacing-lg) var(--spacing-xl);
  border-top: 1px solid var(--border-color);
}

/* ============================================
   Result Score Display
   ============================================ */
.score-display {
  text-align: center;
  padding: var(--spacing-3xl) var(--spacing-xl);
}

.score-circle {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  margin: 0 auto var(--spacing-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  background: var(--bg-glass);
  border: 4px solid var(--border-color);
}

.score-circle::before {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  padding: 4px;
  background: var(--gradient-primary);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
}

.score-circle.excellent::before {
  background: var(--gradient-success);
}

.score-circle.good::before {
  background: var(--gradient-primary);
}

.score-circle.average::before {
  background: var(--gradient-warning);
}

.score-circle.poor::before {
  background: var(--gradient-danger);
}

.score-value {
  font-size: var(--font-size-5xl);
  font-weight: 900;
  line-height: 1;
}

.score-circle.excellent .score-value { color: var(--accent-green); }
.score-circle.good .score-value { color: var(--accent-cyan); }
.score-circle.average .score-value { color: var(--accent-yellow); }
.score-circle.poor .score-value { color: var(--accent-red); }

.score-label {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin-top: var(--spacing-xs);
}

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

.score-detail {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
}

/* ============================================
   Result Detail
   ============================================ */
.result-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-md);
  margin: var(--spacing-xl) 0;
}

.result-stat {
  text-align: center;
  padding: var(--spacing-lg);
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}

.result-stat-value {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--accent-purple);
}

.result-stat-label {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-top: var(--spacing-xs);
  text-transform: uppercase;
}

/* ============================================
   Empty State
   ============================================ */
.empty-state {
  text-align: center;
  padding: var(--spacing-3xl);
  color: var(--text-muted);
}

.empty-state-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-lg);
  opacity: 0.5;
}

.empty-state-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.empty-state-text {
  font-size: var(--font-size-base);
  margin-bottom: var(--spacing-xl);
}

/* ============================================
   Enter Name Form
   ============================================ */
.enter-name-container {
  max-width: 480px;
  margin: var(--spacing-3xl) auto;
  text-align: center;
}

.enter-name-container .card {
  padding: var(--spacing-2xl);
}

.enter-name-container h2 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-sm);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.enter-name-container p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
}

/* ============================================
   Confetti
   ============================================ */
.confetti-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 2000;
  overflow: hidden;
}

.confetti {
  position: absolute;
  width: 10px;
  height: 10px;
  top: -10px;
  animation: confettiFall linear forwards;
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

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

@keyframes confettiFall {
  0% {
    transform: translateY(0) rotateZ(0deg) rotateX(0deg);
    opacity: 1;
  }
  100% {
    transform: translateY(100vh) rotateZ(720deg) rotateX(360deg);
    opacity: 0;
  }
}

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

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

/* ============================================
   Utility Classes
   ============================================ */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-purple { color: var(--accent-purple); }
.text-cyan { color: var(--accent-cyan); }
.text-green { color: var(--accent-green); }
.text-red { color: var(--accent-red); }
.text-yellow { color: var(--accent-yellow); }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mt-2xl { margin-top: var(--spacing-2xl); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

.hidden { display: none !important; }

.w-full { width: 100%; }

.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ============================================
   Admin Question Item
   ============================================ */
.question-item {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  transition: all var(--transition-base);
}

.question-item:hover {
  border-color: var(--border-hover);
}

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

.question-item-number {
  font-size: var(--font-size-xs);
  font-weight: 700;
  color: var(--accent-purple);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.question-item-text {
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  line-height: 1.5;
}

.question-item-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-sm);
}

.question-item-option {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-glass);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.question-item-option.correct {
  color: var(--accent-green);
  background: rgba(16, 185, 129, 0.08);
}

/* ============================================
   Filter bar
   ============================================ */
.filter-bar {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
}

.filter-bar .form-select {
  width: auto;
  min-width: 200px;
}

.filter-bar .form-input {
  width: auto;
  min-width: 250px;
}

/* ============================================
   Score percentage bar
   ============================================ */
.score-bar-container {
  width: 100%;
  height: 6px;
  background: var(--bg-glass);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.score-bar {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

.score-bar.excellent { background: var(--gradient-success); }
.score-bar.good { background: var(--gradient-primary); }
.score-bar.average { background: var(--gradient-warning); }
.score-bar.poor { background: var(--gradient-danger); }

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    z-index: 200;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-toggle {
    display: block;
  }

  .mobile-header {
    display: flex !important;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 150;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-lg);
  }

  .main-content {
    margin-left: 0;
    padding: var(--spacing-lg);
    padding-top: calc(var(--header-height) + var(--spacing-lg));
  }

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

  .quiz-grid {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .question-item-options {
    grid-template-columns: 1fr;
  }

  .filter-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .filter-bar .form-select,
  .filter-bar .form-input {
    width: 100%;
    min-width: unset;
  }

  .modal {
    max-width: 100%;
    margin: var(--spacing-md);
    max-height: calc(100vh - 2rem);
  }

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

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .page-title {
    font-size: var(--font-size-2xl);
  }

  .result-stats {
    grid-template-columns: 1fr;
  }
}

/* Mobile header - hidden by default */
.mobile-header {
  display: none;
}

/* Mobile overlay */
.mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: 150;
}

.mobile-overlay.active {
  display: block;
}

/* ============================================
   Answer Review (after quiz)
   ============================================ */
.review-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

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

.review-item.correct-answer {
  border-left: 3px solid var(--accent-green);
}

.review-item.wrong-answer {
  border-left: 3px solid var(--accent-red);
}

.review-question {
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-start;
}

.review-status {
  font-size: 1.25rem;
  flex-shrink: 0;
}

.review-options {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-left: var(--spacing-2xl);
}

.review-option {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.review-option.user-selected {
  background: rgba(239, 68, 68, 0.08);
  color: var(--accent-red);
}

.review-option.correct-option {
  background: rgba(16, 185, 129, 0.08);
  color: var(--accent-green);
}

.review-option.user-selected.correct-option {
  background: rgba(16, 185, 129, 0.08);
  color: var(--accent-green);
}

/* ============================================
   Login Page
   ============================================ */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
  position: relative;
  z-index: 1;
  background:
    radial-gradient(ellipse 600px 400px at 30% 30%, rgba(139, 92, 246, 0.06) 0%, transparent 70%),
    radial-gradient(ellipse 500px 350px at 70% 70%, rgba(6, 182, 212, 0.05) 0%, transparent 70%),
    var(--bg-primary);
}

.login-card {
  width: 100%;
  max-width: 440px;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl) var(--spacing-2xl) var(--spacing-xl);
  animation: floatIn 0.6s ease;
  position: relative;
  overflow: hidden;
}

.login-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
}

.login-logo {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.login-logo-img {
  max-width: 280px;
  height: auto;
  margin: 0 auto var(--spacing-md);
  display: block;
}

.sidebar-logo-img {
  max-width: 180px;
  height: auto;
  display: block;
}

.header-logo-img {
  max-height: 36px;
  width: auto;
}

.login-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-sm);
}

.login-form .form-group {
  margin-bottom: var(--spacing-lg);
}

.login-form .form-input {
  padding: 0.875rem 1rem;
  font-size: var(--font-size-md);
}

.login-form .btn-primary {
  width: 100%;
  padding: 0.875rem;
  font-size: var(--font-size-md);
  margin-top: var(--spacing-sm);
}

.login-error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.2);
  color: var(--accent-red);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  text-align: center;
  margin-bottom: var(--spacing-lg);
  display: none;
}

.login-error.show {
  display: block;
  animation: slideDown 0.3s ease;
}

.login-hint {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.login-hint-title {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-md);
}

.login-accounts {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
}

.login-account-chip {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-sm) var(--spacing-md);
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: center;
  flex: 1;
}

.login-account-chip:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

.login-account-chip .chip-role {
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 2px;
}

.login-account-chip.admin .chip-role { color: var(--accent-pink); }
.login-account-chip.user .chip-role { color: var(--accent-cyan); }

.login-account-chip .chip-creds {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  font-family: monospace;
}

@keyframes floatIn {
  from {
    opacity: 0;
    transform: translateY(30px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* ============================================
   User Profile (Sidebar)
   ============================================ */
.user-profile {
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 700;
  color: white;
  flex-shrink: 0;
  text-transform: uppercase;
}

.user-avatar.admin-avatar {
  background: var(--gradient-secondary);
}

.user-avatar.user-avatar-style {
  background: var(--gradient-primary);
}

.user-info {
  flex: 1;
  min-width: 0;
  overflow: hidden;
}

.user-name {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-role-badge {
  display: inline-flex;
  align-items: center;
  padding: 1px 8px;
  border-radius: var(--radius-full);
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 2px;
}

.user-role-badge.role-admin {
  background: rgba(236, 72, 153, 0.15);
  color: var(--accent-pink);
}

.user-role-badge.role-user {
  background: rgba(6, 182, 212, 0.15);
  color: var(--accent-cyan);
}

.btn-logout {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 4px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.btn-logout:hover {
  color: var(--accent-red);
  background: rgba(239, 68, 68, 0.1);
}

/* ============================================
   Auth visibility helpers
   ============================================ */
.admin-only {
  /* Controlled via JS */
}

.app-layout.hidden,
.login-page.hidden {
  display: none !important;
}