/* ======================================================================= */
/* QuizCraft - Cyberpunk Themed Quiz Platform */
/* Originally crafted with ❤️ by Kavlin - Developer & Poet */
/* Enhanced for the digital frontier */
/* ======================================================================= */

/* CSS Custom Properties - Cyberpunk Theme */
:root {
  /* Core Cyberpunk Colors */
  --cyber-black: #0a0a0a;
  --cyber-dark: #0f0f0f;
  --cyber-darker: #1a1a1a;
  --cyber-gray: #2a2a2a;
  --cyber-light-gray: #3a3a3a;
  
  /* Neon Colors */
  --neon-cyan: #00ffff;
  --neon-pink: #ff0080;
  --neon-purple: #8000ff;
  --neon-blue: #0080ff;
  --neon-green: #00ff80;
  --neon-yellow: #ffff00;
  --neon-orange: #ff8000;
  
  /* Primary Theme Colors */
  --primary-gradient: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
  --secondary-gradient: linear-gradient(135deg, var(--neon-pink), var(--neon-blue));
  --accent-gradient: linear-gradient(135deg, var(--neon-green), var(--neon-yellow));
  
  /* Text Colors */
  --text-primary: #ffffff;
  --text-secondary: #e0e0e0;
  --text-tertiary: #b0b0b0;
  --text-muted: #808080;
  --text-glow: #00ffff;
  
  /* Glass Effects */
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(0, 255, 255, 0.2);
  --glass-backdrop: blur(20px);
  
  /* Shadows and Glows */
  --glow-sm: 0 0 10px;
  --glow-md: 0 0 20px;
  --glow-lg: 0 0 30px;
  --glow-xl: 0 0 40px;
  
  /* Typography */
  --font-primary: 'Orbitron', 'Courier New', monospace;
  --font-secondary: 'Rajdhani', 'Arial', sans-serif;
  --font-code: 'Fira Code', 'Consolas', monospace;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 0.15s ease-out;
  --transition-normal: 0.3s ease-out;
  --transition-slow: 0.5s ease-out;
  
  /* Z-Index */
  --z-background: -1;
  --z-normal: 1;
  --z-elevated: 10;
  --z-overlay: 100;
  --z-modal: 1000;
  --z-tooltip: 10000;
}

/* Import Cyberpunk Fonts */
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&family=Rajdhani:wght@300;400;500;600;700&family=Fira+Code:wght@300;400;500&display=swap');

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background: var(--cyber-black);
}

body {
  font-family: var(--font-secondary);
  background: 
    radial-gradient(circle at 20% 20%, rgba(0, 255, 255, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(255, 0, 128, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(128, 0, 255, 0.05) 0%, transparent 70%),
    linear-gradient(135deg, var(--cyber-black) 0%, var(--cyber-dark) 50%, var(--cyber-darker) 100%);
  background-attachment: fixed;
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* Cyberpunk Grid Background */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(0, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
  z-index: var(--z-background);
  animation: gridPulse 4s ease-in-out infinite;
}

@keyframes gridPulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.1; }
}

/* Kavlin Tribute Section */
.kavlin-tribute {
  position: relative;
  background: linear-gradient(135deg, rgba(0, 255, 255, 0.1), rgba(255, 0, 128, 0.1));
  border: 1px solid var(--neon-cyan);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  margin: var(--space-2xl) auto;
  max-width: 600px;
  text-align: center;
  box-shadow: 
    var(--glow-md) var(--neon-cyan),
    inset 0 0 20px rgba(0, 255, 255, 0.1);
}

.kavlin-tribute::before {
  content: '✨';
  position: absolute;
  top: -10px;
  left: 20px;
  font-size: 1.5rem;
  animation: sparkle 2s ease-in-out infinite;
}

.kavlin-tribute::after {
  content: '💫';
  position: absolute;
  bottom: -10px;
  right: 20px;
  font-size: 1.5rem;
  animation: sparkle 2s ease-in-out infinite 1s;
}

.kavlin-tribute h2 {
  font-family: var(--font-primary);
  font-size: 1.8rem;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-md);
  text-shadow: var(--glow-sm) var(--neon-cyan);
}

.kavlin-tribute p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
  line-height: 1.6;
}

.kavlin-tribute .poet-quote {
  font-style: italic;
  color: var(--neon-pink);
  text-shadow: var(--glow-sm) var(--neon-pink);
  margin-top: var(--space-md);
  font-size: 0.95rem;
}

/* Loading Screen */
.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at center, rgba(0, 255, 255, 0.2) 0%, transparent 70%),
    var(--cyber-black);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.loading-screen.hidden {
  opacity: 0;
  visibility: hidden;
}

.loading-content {
  text-align: center;
  color: var(--text-primary);
}

.logo-animation {
  position: relative;
  margin-bottom: var(--space-2xl);
}

.logo-text {
  font-family: var(--font-primary);
  font-size: 3rem;
  font-weight: 900;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: var(--glow-lg) var(--neon-cyan);
  animation: logoGlow 2s ease-in-out infinite alternate;
}

.sparkles {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.sparkles::before,
.sparkles::after {
  content: '◆';
  position: absolute;
  font-size: 1.5rem;
  color: var(--neon-pink);
  animation: sparkle 1.5s ease-in-out infinite;
}

.sparkles::before {
  top: -20px;
  left: -30px;
  animation-delay: 0s;
}

.sparkles::after {
  bottom: -20px;
  right: -30px;
  animation-delay: 0.7s;
}

.loading-bar {
  width: 300px;
  height: 4px;
  background: rgba(0, 255, 255, 0.2);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin: 0 auto var(--space-md);
  border: 1px solid var(--neon-cyan);
}

.loading-progress {
  width: 0%;
  height: 100%;
  background: var(--primary-gradient);
  border-radius: var(--radius-full);
  animation: loadingProgress 2s ease-in-out infinite;
  box-shadow: var(--glow-sm) var(--neon-cyan);
}

.loading-text {
  font-family: var(--font-code);
  font-size: 0.9rem;
  color: var(--text-secondary);
  opacity: 0.8;
  animation: textGlow 2s ease-in-out infinite;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-elevated);
  background: 
    linear-gradient(135deg, rgba(0, 0, 0, 0.8), rgba(26, 26, 26, 0.9)),
    rgba(0, 0, 0, 0.5);
  backdrop-filter: var(--glass-backdrop);
  border-bottom: 1px solid var(--neon-cyan);
  box-shadow: 
    0 4px 20px rgba(0, 0, 0, 0.5),
    var(--glow-sm) var(--neon-cyan);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-xl);
  max-width: 1400px;
  margin: 0 auto;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  color: var(--text-primary);
  text-decoration: none;
  font-family: var(--font-primary);
  font-weight: 700;
  font-size: 1.5rem;
  transition: all var(--transition-normal);
}

.nav-brand:hover {
  transform: scale(1.05);
  text-shadow: var(--glow-md) var(--neon-cyan);
}

.brand-icon {
  font-size: 2rem;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: iconPulse 3s ease-in-out infinite;
}

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

.nav-controls {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.theme-toggle,
.sound-toggle {
  position: relative;
  width: 44px;
  height: 44px;
  border: none;
  background: var(--glass-bg);
  border: 1px solid var(--neon-cyan);
  border-radius: var(--radius-md);
  color: var(--neon-cyan);
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: var(--glass-backdrop);
}

.theme-toggle:hover,
.sound-toggle:hover {
  background: rgba(0, 255, 255, 0.1);
  transform: scale(1.1);
  box-shadow: var(--glow-md) var(--neon-cyan);
}

.user-profile {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-lg);
  background: var(--glass-bg);
  border: 1px solid var(--neon-pink);
  border-radius: var(--radius-full);
  color: var(--text-primary);
  transition: all var(--transition-normal);
  backdrop-filter: var(--glass-backdrop);
}

.user-profile:hover {
  background: rgba(255, 0, 128, 0.1);
  transform: translateY(-2px);
  box-shadow: var(--glow-md) var(--neon-pink);
}

.avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  border: 2px solid var(--neon-pink);
  object-fit: cover;
  box-shadow: var(--glow-sm) var(--neon-pink);
}

.username {
  font-family: var(--font-primary);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--neon-pink);
  text-shadow: var(--glow-sm) var(--neon-pink);
}

/* Main Content */
.main-content {
  padding-top: 80px;
  min-height: calc(100vh - 80px);
  position: relative;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

/* Hero Section */
.hero {
  position: relative;
  padding: var(--space-3xl) 0;
  text-align: center;
  overflow: hidden;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
}

.floating-elements {
  position: relative;
  width: 100%;
  height: 100%;
}

.code-snippet {
  position: absolute;
  color: rgba(0, 255, 255, 0.2);
  font-family: var(--font-code);
  font-weight: 500;
  pointer-events: none;
  animation: float 8s ease-in-out infinite;
  text-shadow: var(--glow-sm) var(--neon-cyan);
}

.snippet-1 {
  top: 15%;
  left: 10%;
  font-size: 2.5rem;
  animation-delay: 0s;
  color: rgba(0, 255, 255, 0.3);
}

.snippet-2 {
  top: 60%;
  right: 15%;
  font-size: 2rem;
  animation-delay: 2s;
  color: rgba(255, 0, 128, 0.3);
}

.snippet-3 {
  bottom: 25%;
  left: 20%;
  font-size: 1.8rem;
  animation-delay: 4s;
  color: rgba(128, 0, 255, 0.3);
}

.snippet-4 {
  top: 35%;
  right: 5%;
  font-size: 2rem;
  animation-delay: 6s;
  color: rgba(0, 255, 128, 0.3);
}

.hero-content {
  position: relative;
  z-index: var(--z-normal);
  max-width: 900px;
  margin: 0 auto;
}

.hero-title {
  margin-bottom: var(--space-2xl);
  font-family: var(--font-primary);
}

.title-line {
  display: block;
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: var(--space-sm);
}

.title-line:first-child {
  color: var(--text-primary);
  text-shadow: var(--glow-lg) var(--neon-cyan);
}

.title-accent {
  background: var(--secondary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradientShift 3s ease-in-out infinite;
  text-shadow: var(--glow-lg) var(--neon-pink);
}

.hero-description {
  font-size: 1.3rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-3xl);
  line-height: 1.6;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-3xl);
  margin-bottom: var(--space-3xl);
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
  padding: var(--space-lg);
  background: var(--glass-bg);
  border: 1px solid var(--neon-cyan);
  border-radius: var(--radius-lg);
  backdrop-filter: var(--glass-backdrop);
  transition: all var(--transition-normal);
}

.stat-item:hover {
  transform: translateY(-5px) scale(1.05);
  box-shadow: var(--glow-lg) var(--neon-cyan);
}

.stat-number {
  display: block;
  font-family: var(--font-primary);
  font-size: 2.5rem;
  font-weight: 900;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-sm);
  text-shadow: var(--glow-md) var(--neon-green);
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
}

/* Quiz Selection */
.quiz-selection {
  padding: var(--space-3xl) 0;
  position: relative;
}

.quiz-selection::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 30% 30%, rgba(0, 255, 255, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 70% 70%, rgba(255, 0, 128, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.section-title {
  text-align: center;
  font-family: var(--font-primary);
  font-size: 2.8rem;
  font-weight: 900;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-md);
  text-shadow: var(--glow-lg) var(--neon-cyan);
}

.section-subtitle {
  text-align: center;
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-3xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.quiz-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
  gap: var(--space-2xl);
  max-width: 1600px;
  margin: 0 auto;
  position: relative;
  z-index: var(--z-normal);
}

.quiz-card {
  position: relative;
  background: 
    linear-gradient(135deg, rgba(0, 0, 0, 0.8), rgba(26, 26, 26, 0.6)),
    var(--glass-bg);
  backdrop-filter: var(--glass-backdrop);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-2xl);
  transition: all var(--transition-normal);
  overflow: hidden;
  cursor: pointer;
  transform-style: preserve-3d;
}

.quiz-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--primary-gradient);
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

.quiz-card:hover {
  transform: translateY(-10px) rotateY(5deg);
  box-shadow: 
    var(--glow-xl) var(--neon-cyan),
    0 20px 40px rgba(0, 0, 0, 0.5);
  border-color: var(--neon-cyan);
}

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

.card-background {
  position: absolute;
  top: var(--space-lg);
  right: var(--space-lg);
  opacity: 0.1;
  pointer-events: none;
  transition: all var(--transition-normal);
}

.quiz-card:hover .card-background {
  opacity: 0.2;
  transform: scale(1.1) rotate(10deg);
}

.card-icon {
  font-size: 4rem;
  background: var(--secondary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.card-content {
  position: relative;
  z-index: var(--z-normal);
}

.card-title {
  font-family: var(--font-primary);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  text-shadow: var(--glow-sm) var(--neon-cyan);
}

.card-description {
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  line-height: 1.6;
  font-size: 1rem;
}

.card-stats {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.difficulty {
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 1px solid;
}

.difficulty.easy {
  background: rgba(0, 255, 128, 0.1);
  color: var(--neon-green);
  border-color: var(--neon-green);
  box-shadow: var(--glow-sm) var(--neon-green);
}

.difficulty.medium {
  background: rgba(255, 255, 0, 0.1);
  color: var(--neon-yellow);
  border-color: var(--neon-yellow);
  box-shadow: var(--glow-sm) var(--neon-yellow);
}

.difficulty.hard {
  background: rgba(255, 0, 128, 0.1);
  color: var(--neon-pink);
  border-color: var(--neon-pink);
  box-shadow: var(--glow-sm) var(--neon-pink);
}

.questions-count {
  color: var(--text-tertiary);
  font-size: 0.9rem;
  font-family: var(--font-code);
}

.card-progress {
  margin-bottom: var(--space-lg);
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: rgba(0, 255, 255, 0.1);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: var(--space-sm);
  border: 1px solid rgba(0, 255, 255, 0.2);
}

.progress-fill {
  width: var(--progress);
  height: 100%;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
  transition: width var(--transition-normal);
  box-shadow: var(--glow-sm) var(--neon-green);
}

.progress-text {
  color: var(--text-tertiary);
  font-size: 0.8rem;
  font-family: var(--font-code);
}

.card-button {
  width: 100%;
  padding: var(--space-lg);
  background: var(--primary-gradient);
  border: none;
  border-radius: var(--radius-lg);
  color: var(--cyber-black);
  font-family: var(--font-primary);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  position: relative;
  overflow: hidden;
}

.card-button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left var(--transition-normal);
}

.card-button:hover {
  transform: translateY(-3px);
  box-shadow: var(--glow-lg) var(--neon-cyan);
}

.card-button:hover::before {
  left: 100%;
}

.card-button:active {
  transform: translateY(-1px);
}

/* Statistics Section */
.statistics {
  padding: var(--space-3xl) 0;
  background: 
    linear-gradient(135deg, rgba(0, 0, 0, 0.3), rgba(26, 26, 26, 0.1)),
    radial-gradient(circle at center, rgba(128, 0, 255, 0.05) 0%, transparent 70%);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
  max-width: 1000px;
  margin: 0 auto;
}

.stat-card {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-xl);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-backdrop);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

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

.stat-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--glow-lg) var(--neon-cyan);
  border-color: var(--neon-cyan);
}

.stat-card:hover::before {
  opacity: 0.05;
}

.stat-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--secondary-gradient);
  border-radius: var(--radius-lg);
  color: var(--cyber-black);
  font-size: 1.5rem;
  font-weight: 700;
  box-shadow: var(--glow-md) var(--neon-pink);
  position: relative;
  z-index: var(--z-normal);
}

.stat-info {
  flex: 1;
  position: relative;
  z-index: var(--z-normal);
}

.stat-value {
  display: block;
  font-family: var(--font-primary);
  font-size: 2rem;
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
  text-shadow: var(--glow-sm) var(--neon-cyan);
}

.stat-label {
  color: var(--text-tertiary);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

/* Footer */
.footer {
  background: 
    linear-gradient(135deg, rgba(0, 0, 0, 0.9), rgba(26, 26, 26, 0.8)),
    var(--cyber-dark);
  backdrop-filter: var(--glass-backdrop);
  padding: var(--space-3xl) 0 var(--space-xl);
  border-top: 1px solid var(--neon-cyan);
  box-shadow: 
    0 -4px 20px rgba(0, 0, 0, 0.5),
    var(--glow-sm) var(--neon-cyan);
  position: relative;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer-section h3,
.footer-section h4 {
  font-family: var(--font-primary);
  color: var(--neon-cyan);
  margin-bottom: var(--space-lg);
  text-shadow: var(--glow-sm) var(--neon-cyan);
}

.footer-section p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.social-links {
  display: flex;
  gap: var(--space-lg);
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--glass-bg);
  border: 1px solid var(--neon-cyan);
  border-radius: var(--radius-full);
  color: var(--neon-cyan);
  text-decoration: none;
  transition: all var(--transition-normal);
  backdrop-filter: var(--glass-backdrop);
}

.social-links a:hover {
  background: var(--secondary-gradient);
  color: var(--cyber-black);
  transform: translateY(-3px) scale(1.1);
  box-shadow: var(--glow-md) var(--neon-pink);
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: var(--space-sm);
}

.footer-section ul li a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-normal);
  position: relative;
}

.footer-section ul li a::before {
  content: '▶';
  position: absolute;
  left: -15px;
  opacity: 0;
  transition: all var(--transition-normal);
  color: var(--neon-cyan);
}

.footer-section ul li a:hover {
  color: var(--neon-cyan);
  padding-left: 20px;
  text-shadow: var(--glow-sm) var(--neon-cyan);
}

.footer-section ul li a:hover::before {
  opacity: 1;
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-xl);
  border-top: 1px solid rgba(0, 255, 255, 0.2);
}

.footer-bottom p {
  color: var(--text-muted);
  font-family: var(--font-code);
  font-size: 0.9rem;
}

.footer-section details {
  margin-bottom: var(--space-sm);
  border-bottom: 1px solid rgba(0, 255, 255, 0.1);
}

.footer-section details[open] {
  padding-bottom: var(--space-md);
}

.footer-section summary {
  cursor: pointer;
  list-style: none;
  color: var(--text-secondary);
  padding: var(--space-sm) 0;
  transition: all var(--transition-normal);
  position: relative;
  padding-left: 20px;
}

.footer-section summary::before {
  content: '▶';
  position: absolute;
  left: 0;
  font-size: 0.7em;
  transition: all var(--transition-normal);
  color: var(--neon-cyan);
}

.footer-section summary:hover {
  color: var(--neon-cyan);
}

.footer-section details[open] > summary::before {
  transform: rotate(90deg);
}

.footer-section details p {
  padding-top: var(--space-sm);
  font-size: 0.9rem;
  color: var(--text-muted);
}
.footer-section details p a {
  color: var(--neon-pink);
  text-decoration: none;
}

/* Animations */
@keyframes logoGlow {
  0% { text-shadow: var(--glow-md) var(--neon-cyan); }
  100% { text-shadow: var(--glow-xl) var(--neon-cyan), var(--glow-lg) var(--neon-pink); }
}

@keyframes sparkle {
  0%, 100% {
    transform: scale(0) rotate(0deg);
    opacity: 0;
  }
  50% {
    transform: scale(1) rotate(180deg);
    opacity: 1;
  }
}

@keyframes loadingProgress {
  0% { width: 0%; }
  50% { width: 70%; }
  100% { width: 100%; }
}

@keyframes textGlow {
  0%, 100% { opacity: 0.8; }
  50% { opacity: 1; }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px) rotate(0deg);
  }
  33% {
    transform: translateY(-20px) rotate(5deg);
  }
  66% {
    transform: translateY(10px) rotate(-3deg);
  }
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

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

/* Responsive Design */
@media (max-width: 768px) {
  .navbar {
    padding: var(--space-md);
  }
  
  .nav-brand {
    font-size: 1.2rem;
  }
  
  .nav-controls {
    gap: var(--space-md);
  }
  
  .username {
    display: none;
  }
  
  .hero {
    padding: var(--space-2xl) 0;
  }
  
  .title-line {
    font-size: 2.5rem;
  }
  
  .hero-description {
    font-size: 1.1rem;
  }
  
  .hero-stats {
    gap: var(--space-lg);
  }
  
  .quiz-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
  
  .kavlin-tribute {
    margin: var(--space-xl) var(--space-md);
    padding: var(--space-lg);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-lg);
  }
  
  .title-line {
    font-size: 2rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .quiz-card {
    padding: var(--space-lg);
  }
  
  .stat-card {
    padding: var(--space-lg);
  }
  
  .hero-stats {
    flex-direction: column;
    gap: var(--space-lg);
  }
}

/* Utility Classes */
.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.text-glow {
  text-shadow: var(--glow-md) var(--neon-cyan);
}

.cyber-border {
  border: 1px solid var(--neon-cyan);
  box-shadow: var(--glow-sm) var(--neon-cyan);
}

.neon-text {
  color: var(--neon-cyan);
  text-shadow: var(--glow-sm) var(--neon-cyan);
}