styles.css

/* ===============================================
   MystIQ - Premium Interactive Quiz Platform
   =============================================== */

/* CSS Custom Properties for Theme Management */
:root {
  /* Cyberpunk Theme (Default) */
  --primary: #00ffff;
  --primary-dark: #00cccc;
  --primary-light: #66ffff;
  --secondary: #ff00ff;
  --secondary-dark: #cc00cc;
  --accent: #ffff00;
  --background: #0a0a0a;
  --background-light: #1a1a1a;
  --surface: #2a2a2a;
  --surface-light: #3a3a3a;
  --text: #ffffff;
  --text-secondary: #cccccc;
  --text-muted: #999999;
  --border: #333333;
  --success: #00ff88;
  --error: #ff4466;
  --warning: #ffaa00;
  --shadow: rgba(0, 255, 255, 0.3);
  --glow: 0 0 20px var(--primary);
  --gradient: linear-gradient(135deg, var(--primary), var(--secondary));
  --glass: rgba(255, 255, 255, 0.1);
  --blur: blur(10px);
}

/* Theme Variations */
[data-theme="forest"] {
  --primary: #2d5a27;
  --primary-dark: #1e3a1a;
  --primary-light: #4a8f42;
  --secondary: #8b4513;
  --secondary-dark: #654321;
  --accent: #ffd700;
  --background: #0f1419;
  --background-light: #1a2530;
  --surface: #2d3748;
  --surface-light: #4a5568;
  --text: #e2e8f0;
  --text-secondary: #cbd5e0;
  --text-muted: #a0aec0;
  --border: #4a5568;
  --success: #48bb78;
  --error: #f56565;
  --warning: #ed8936;
  --shadow: rgba(45, 90, 39, 0.4);
  --glow: 0 0 20px var(--primary);
  --gradient: linear-gradient(135deg, var(--primary), var(--secondary));
  --glass: rgba(255, 255, 255, 0.05);
}

[data-theme="ocean"] {
  --primary: #0077be;
  --primary-dark: #005c91;
  --primary-light: #339bd6;
  --secondary: #20b2aa;
  --secondary-dark: #198b85;
  --accent: #ff6b35;
  --background: #001122;
  --background-light: #002244;
  --surface: #003366;
  --surface-light: #004488;
  --text: #f0f8ff;
  --text-secondary: #b3d9ff;
  --text-muted: #7fb3d3;
  --border: #004488;
  --success: #00d4aa;
  --error: #ff6b6b;
  --warning: #ffc107;
  --shadow: rgba(0, 119, 190, 0.4);
  --glow: 0 0 20px var(--primary);
  --gradient: linear-gradient(135deg, var(--primary), var(--secondary));
  --glass: rgba(255, 255, 255, 0.08);
}

[data-theme="sunset"] {
  --primary: #ff6b35;
  --primary-dark: #e55100;
  --primary-light: #ff8a65;
  --secondary: #d500f9;
  --secondary-dark: #9c27b0;
  --accent: #ffeb3b;
  --background: #1a0d00;
  --background-light: #2d1a00;
  --surface: #4a2c00;
  --surface-light: #5d3500;
  --text: #fff3e0;
  --text-secondary: #ffcc80;
  --text-muted: #ffab40;
  --border: #5d3500;
  --success: #4caf50;
  --error: #f44336;
  --warning: #ff9800;
  --shadow: rgba(255, 107, 53, 0.4);
  --glow: 0 0 20px var(--primary);
  --gradient: linear-gradient(135deg, var(--primary), var(--secondary));
  --glass: rgba(255, 255, 255, 0.06);
}

[data-theme="cosmic"] {
  --primary: #8b5cf6;
  --primary-dark: #7c3aed;
  --primary-light: #a78bfa;
  --secondary: #ec4899;
  --secondary-dark: #db2777;
  --accent: #06ffa5;
  --background: #0c0a1a;
  --background-light: #1a1625;
  --surface: #2d2438;
  --surface-light: #3d3349;
  --text: #f8fafc;
  --text-secondary: #d1d5db;
  --text-muted: #9ca3af;
  --border: #3d3349;
  --success: #10b981;
  --error: #ef4444;
  --warning: #f59e0b;
  --shadow: rgba(139, 92, 246, 0.4);
  --glow: 0 0 20px var(--primary);
  --gradient: linear-gradient(135deg, var(--primary), var(--secondary));
  --glass: rgba(255, 255, 255, 0.04);
}

/* Global Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  text-align: center;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--background);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  transition: all 0.3s ease;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--primary);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-dark);
}

/* App Container */
.app-container {
  min-height: 100vh;
  background:
    radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 40% 40%, rgba(120, 219, 255, 0.05) 0%, transparent 50%),
    var(--background);
  position: relative;
}

/* Navigation */
.nav-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: var(--blur);
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
}

.nav-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  font-size: 2rem;
  animation: pulse 2s infinite;
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-actions {
  display: flex;
  gap: 1rem;
}

.nav-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.5rem;
  border-radius: 8px;
  font-size: 1.2rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.nav-btn:hover {
  background: var(--surface-light);
  box-shadow: var(--glow);
  transform: translateY(-2px);
}

/* Main Content */
.main-content {
  padding-top: 6rem;
}

/* Section Base Styles */
.welcome-screen,
.quiz-screen,
.results-screen,
.review-screen {
  min-height: calc(100vh - 6rem);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.welcome-screen.active,
.quiz-screen.active,
.results-screen.active,
.review-screen.active {
  display: flex;
}

/* Welcome Screen */
.welcome-container {
  max-width: 1200px;
  width: 100%;
  text-align: center;
}

.welcome-hero {
  margin-bottom: 4rem;
}

.welcome-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  margin-bottom: 1rem;
  line-height: 1.1;
}

.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
}

.gradient-text::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient);
  opacity: 0.3;
  filter: blur(20px);
  z-index: -1;
}

.welcome-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.section-title {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 2rem;
  color: var(--text);
}

/* Topic Selection */
.topic-selection {
  margin-bottom: 4rem;
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.topic-card {
  background: var(--glass);
  backdrop-filter: var(--blur);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.topic-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.topic-card:hover::before {
  opacity: 0.1;
}

.topic-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3), var(--glow);
  border-color: var(--primary);
}

.topic-card.selected {
  border-color: var(--primary);
  box-shadow: var(--glow);
}

.topic-card.selected::before {
  opacity: 0.15;
}

.topic-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.topic-card h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.topic-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Quiz Settings */
.quiz-settings {
  margin-bottom: 4rem;
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  max-width: 800px;
  margin: 0 auto;
}

.setting-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.setting-group label {
  font-weight: 500;
  color: var(--text);
}

.setting-select {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.75rem;
  border-radius: 8px;
  font-size: 1rem;
  transition: all 0.3s ease;
}

.setting-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 255, 255, 0.1);
}

/* Buttons */
.start-btn,
.action-btn {
  background: var(--gradient);
  border: none;
  color: var(--text);
  padding: 1rem 2rem;
  border-radius: 12px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  text-decoration: none;
}

.start-btn {
  padding: 1.5rem 3rem;
  font-size: 1.2rem;
  margin-top: 2rem;
}

.start-btn:hover,
.action-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3), var(--glow);
}

.action-btn.secondary {
  background: var(--surface);
  border: 1px solid var(--border);
}

.action-btn.secondary:hover {
  background: var(--surface-light);
}

.btn-effect {
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s ease;
}

.start-btn:hover .btn-effect {
  left: 100%;
}

/* Quiz Screen */
.quiz-container {
  max-width: 900px;
  width: 100%;
  background: var(--glass);
  backdrop-filter: var(--blur);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 3rem;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 3rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.progress-container {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex: 1;
}

.progress-bar {
  flex: 1;
  height: 8px;
  background: var(--surface);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}

.progress-fill {
  height: 100%;
  background: var(--gradient);
  width: 0%;
  transition: width 0.3s ease;
  position: relative;
}

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

.progress-text {
  font-weight: 600;
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
}

/* Statistics Section */
.modal-header {
  display: flex;
  text-align: center;
  justify-content: space-between;
  padding: 2rem;
}

.modal-close {
  padding: 0.5rem;
  color: white;
  background-color: black;
  font-size: x-large;
}

.quiz-stats {
  display: flex;
  gap: 2rem;
}

.stat-item {
  display: flex;
  flex-direction: column;
  border: 2px solid white;
  padding: 2rem;
  border-radius: 30px;
  margin-top: 2rem;
  border-color: white;
  text-align: center;
  margin-bottom: 2rem;
}

.stats-grid {
  display: flex;
  justify-content: space-evenly;
}

.stat-label {
  display: block;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-value {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  font-family: 'JetBrains Mono', monospace;
}

/* Recent Scores Section */
.recentScoreText {
  margin: 1rem 1rem;
}
.recent-scores {
  text-align: center;
  display: flex;
  justify-content: center;
  /* justify-content: space-evenly; */
  gap: 2rem;
}
.recent-score-info {
  display: flex;
  flex-direction: column;
}
.recent-score {
  display: flex;
  flex-direction: column;
  border: 2px solid white;
  width: 20%;
  padding: 1rem;
  border-radius: 30px;
  justify-content: space-evenly;
  /* gap: 2rem; */
  /* border: 2px solid white; */
}

.timer-stat .stat-value {
  color: var(--accent);
}

.timer-stat.warning .stat-value {
  color: var(--warning);
  animation: pulse 1s infinite;
}

.timer-stat.danger .stat-value {
  color: var(--error);
  animation: pulse 0.5s infinite;
}

.question-container {
  text-align: center;
}

.question-number {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.question-text {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 3rem;
  line-height: 1.4;
  color: var(--text);
}

.answers-container {
  display: grid;
  gap: 1rem;
  margin-bottom: 3rem;
}

.answer-option {
  background: var(--surface);
  border: 2px solid var(--border);
  color: var(--text);
  padding: 1.5rem;
  border-radius: 12px;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
  text-align: left;
  position: relative;
  overflow: hidden;
}

.answer-option::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.answer-option:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.answer-option:hover::before {
  opacity: 0.1;
}

.answer-option.selected {
  border-color: var(--primary);
  box-shadow: var(--glow);
}

.answer-option.selected::before {
  opacity: 0.15;
}

.answer-option.correct {
  border-color: var(--success);
  background: rgba(0, 255, 136, 0.1);
}

.answer-option.incorrect {
  border-color: var(--error);
  background: rgba(255, 68, 102, 0.1);
}

.question-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.action-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.action-btn:disabled:hover {
  transform: none;
  box-shadow: none;
}

/* Results Screen */
.results-container {
  max-width: 600px;
  width: 100%;
  text-align: center;
}

.results-header {
  margin-bottom: 3rem;
}

.results-animation {
  margin-bottom: 2rem;
}

.trophy {
  font-size: 4rem;
  animation: bounce 2s infinite;
}

.results-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.results-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
}

.score-display {
  margin-bottom: 3rem;
}

.score-circle {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: var(--gradient);
  margin: 0 auto 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  animation: rotateGlow 4s ease-in-out infinite;
}

.score-circle::before {
  content: '';
  position: absolute;
  inset: -10px;
  border-radius: 50%;
  background: var(--gradient);
  filter: blur(20px);
  opacity: 0.5;
  z-index: -1;
}

.score-value {
  font-size: 3rem;
  font-weight: 700;
  color: var(--background);
  font-family: 'JetBrains Mono', monospace;
}

.score-total {
  font-size: 1.5rem;
  color: var(--background);
  opacity: 0.8;
  font-family: 'JetBrains Mono', monospace;
}

.score-percentage {
  font-size: 2rem;
  font-weight: 600;
  color: var(--primary);
  font-family: 'JetBrains Mono', monospace;
}

.results-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.stat-card {
  background: var(--glass);
  backdrop-filter: var(--blur);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem 1rem;
  text-align: center;
  transition: all 0.3s ease;
}

.stat-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

.stat-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.stat-number {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.results-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Review Screen */
.review-container {
  max-width: 800px;
  width: 100%;
  background: var(--glass);
  backdrop-filter: var(--blur);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 3rem;
  max-height: 80vh;
  overflow-y: auto;
  position: relative;
}

.review-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  position: sticky;
  top: 0;
  background: var(--glass);
  backdrop-filter: var(--blur);
  padding: 1rem 0;
  z-index: 10;
}

.review-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text);
}

.close-btn {
  background: var(--error);
  border: none;
  color: white;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.close-btn:hover {
  background: var(--secondary-dark);
  transform: scale(1.1);
}

.review-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
  margin-bottom: 2rem;
  transition: all 0.3s ease;
}

.review-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.review-question {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text);
}

.review-answers {
  display: grid;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.review-answer {
  padding: 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--background-light);
}

.review-answer.correct {
  border-color: var(--success);
  background: rgba(0, 255, 136, 0.1);
}

.review-answer.incorrect {
  border-color: var(--error);
  background: rgba(255, 68, 102, 0.1);
}

.review-answer.user-selected {
  border-color: var(--primary);
  background: rgba(0, 255, 255, 0.1);
}

.review-explanation {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-style: italic;
  margin-top: 1rem;
  padding: 1rem;
  background: var(--surface-light);
  border-radius: 8px;
  border-left: 4px solid var(--primary);
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.9);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.loading-overlay.active {
  opacity: 1;
  visibility: visible;
}

.loading-spinner {
  position: relative;
  width: 80px;
  height: 80px;
  margin-bottom: 2rem;
}

.spinner-ring {
  position: absolute;
  width: 100%;
  height: 100%;
  border: 4px solid transparent;
  border-radius: 50%;
  animation: spin 1.5s linear infinite;
}

.spinner-ring:nth-child(1) {
  border-top-color: var(--primary);
  animation-delay: 0s;
}

.spinner-ring:nth-child(2) {
  border-right-color: var(--secondary);
  animation-delay: 0.3s;
}

.spinner-ring:nth-child(3) {
  border-bottom-color: var(--accent);
  animation-delay: 0.6s;
}

.loading-text {
  font-size: 1.1rem;
  color: var(--text-secondary);
  text-align: center;
}

/* Notifications */
.notification-container {
  position: fixed;
  top: 100px;
  right: 2rem;
  z-index: 10000;
  max-width: 400px;
}

.notification {
  background: var(--glass);
  backdrop-filter: var(--blur);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem 1.5rem;
  margin-bottom: 1rem;
  color: var(--text);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  transform: translateX(100%);
  transition: all 0.3s ease;
  cursor: pointer;
}

.notification.show {
  transform: translateX(0);
}

.notification.success {
  border-left: 4px solid var(--success);
}

.notification.error {
  border-left: 4px solid var(--error);
}

.notification.warning {
  border-left: 4px solid var(--warning);
}

.notification.info {
  border-left: 4px solid var(--primary);
}

/* Hint Modal */
.hint-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.hint-modal.active {
  opacity: 1;
  visibility: visible;
}

.hint-content {
  background: var(--glass);
  backdrop-filter: var(--blur);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
  max-width: 500px;
  width: 90%;
  text-align: center;
  transform: scale(0.8);
  transition: transform 0.3s ease;
}

.hint-modal.active .hint-content {
  transform: scale(1);
}

.hint-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.hint-text {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.6;
}

/* Animations */
@keyframes spin {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

@keyframes pulse {

  0%,
  100% {
    transform: scale(1);
    opacity: 1;
  }

  50% {
    transform: scale(1.05);
    opacity: 0.8;
  }
}

@keyframes bounce {

  0%,
  20%,
  50%,
  80%,
  100% {
    transform: translateY(0);
  }

  40% {
    transform: translateY(-10px);
  }

  60% {
    transform: translateY(-5px);
  }
}

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

  100% {
    transform: translateX(100%);
  }
}

@keyframes rotateGlow {

  0%,
  100% {
    transform: rotate(0deg);
  }

  50% {
    transform: rotate(180deg);
  }
}

@keyframes fadeInUp {
  0% {
    opacity: 0;
    transform: translateY(30px);
  }

  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInRight {
  0% {
    opacity: 0;
    transform: translateX(30px);
  }

  100% {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-content {
    padding: 0 1rem;
  }

  .logo-text {
    font-size: 1.2rem;
  }

  .welcome-container,
  .quiz-container,
  .results-container,
  .review-container {
    padding: 1.5rem;
  }

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

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

  .quiz-header {
    flex-direction: column;
    align-items: stretch;
  }

  .quiz-stats {
    justify-content: center;
  }

  .question-actions {
    flex-direction: column;
  }

  .results-actions {
    flex-direction: column;
  }

  .score-circle {
    width: 150px;
    height: 150px;
  }

  .score-value {
    font-size: 2rem;
  }

  .notification-container {
    right: 1rem;
    left: 1rem;
  }
}

@media (max-width: 480px) {
  .welcome-title {
    font-size: 2rem;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .topic-card {
    padding: 1.5rem;
  }

  .quiz-container {
    padding: 2rem;
  }

  .question-text {
    font-size: 1.2rem;
  }

  .answer-option {
    padding: 1rem;
  }

  .start-btn {
    padding: 1rem 2rem;
    font-size: 1rem;
  }
}

/* Theme Selector */
.theme-selector {
  position: fixed;
  top: 50%;
  right: 2rem;
  transform: translateY(-50%);
  background: var(--glass);
  backdrop-filter: var(--blur);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.theme-selector.active {
  opacity: 1;
  visibility: visible;
}

.theme-option {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 2px solid var(--border);
  margin-bottom: 0.5rem;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
}

.theme-option:hover {
  transform: scale(1.1);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.theme-option.active {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 255, 255, 0.3);
}

.theme-option[data-theme="cyberpunk"] {
  background: linear-gradient(135deg, #00ffff, #ff00ff);
}

.theme-option[data-theme="forest"] {
  background: linear-gradient(135deg, #2d5a27, #8b4513);
}

.theme-option[data-theme="ocean"] {
  background: linear-gradient(135deg, #0077be, #20b2aa);
}

.theme-option[data-theme="sunset"] {
  background: linear-gradient(135deg, #ff6b35, #d500f9);
}

.theme-option[data-theme="cosmic"] {
  background: linear-gradient(135deg, #8b5cf6, #ec4899);
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus styles for accessibility */
button:focus,
select:focus,
.answer-option:focus,
.topic-card:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --border: #ffffff;
    --text-secondary: #ffffff;
    --text-muted: #cccccc;
  }
}

/* Print styles */
@media print {

  .nav-header,
  .loading-overlay,
  .notification-container,
  .theme-selector {
    display: none;
  }

  .main-content {
    padding-top: 0;
  }

  .quiz-container,
  .results-container {
    background: white;
    color: black;
    box-shadow: none;
    border: 1px solid black;
  }
}

.developer-credit {
  position: fixed;
  bottom: 20px;
  right: 20px;
  padding: 12px 18px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  font-size: 0.8rem;
  font-family: 'Poppins', sans-serif;
  color: #e0e0e0;
  opacity: 0.75;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
  z-index: 100;
  transition: all 0.3s ease;
  letter-spacing: 0.4px;
}

.developer-credit:hover {
  opacity: 1;
  transform: translateY(-2px) scale(1.015);
  box-shadow: 0 6px 18px rgba(255, 193, 111, 0.35);
}

.explorer-signature {
  font-family: 'Georgia', 'Times New Roman', serif;
  font-weight: 500;
  font-size: 0.8rem;
  color: #f3f3f3;
  letter-spacing: 0.5px;
}

.eccentric {
  font-weight: 700;
  font-family: 'Georgia', 'Times New Roman', serif;
  background: linear-gradient(90deg, #fcb045, #fd1d1d, #833ab4);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  background-size: 200% auto;
  animation: shimmerText 4s ease infinite;
}