:root {
  /* Vibrant Gaming Color Palette */
  --primary-color: #6366f1;
  --primary-hover: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.4);
  
  --secondary-color: #8b5cf6;
  --secondary-hover: #7c3aed;
  --secondary-glow: rgba(139, 92, 246, 0.4);
  
  --success-color: #10b981;
  --success-hover: #059669;
  --success-glow: rgba(16, 185, 129, 0.4);
  
  --danger-color: #ef4444;
  --danger-hover: #dc2626;
  --danger-glow: rgba(239, 68, 68, 0.4);
  
  --warning-color: #f59e0b;
  --warning-hover: #d97706;
  --warning-glow: rgba(245, 158, 11, 0.4);
  
  --accent-color: #06b6d4;
  --accent-hover: #0891b2;
  --accent-glow: rgba(6, 182, 212, 0.4);
  
  /* Dark Gaming Theme */
  --bg-color: #0f0f23;
  --bg-gradient: linear-gradient(135deg, #0f0f23 0%, #1a1a3e 50%, #2d1b69 100%);
  --surface-color: #1e1e3f;
  --surface-hover: #2a2a5a;
  --surface-glow: rgba(30, 30, 63, 0.8);
  
  --text-primary: #ffffff;
  --text-secondary: #a1a1aa;
  --text-accent: #fbbf24;
  --border-color: #374151;
  --border-glow: rgba(99, 102, 241, 0.3);
  
  /* Game-specific colors */
  --tile-size: 50px;
  --grid-gap: 3px;
  --border-radius: 12px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 16px 64px rgba(99, 102, 241, 0.2);
  --glow-effect: 0 0 20px;
  
  --font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

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

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at 20% 80%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 40% 40%, rgba(6, 182, 212, 0.05) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

#app {
  position: relative;
  min-height: 100vh;
}

/* Screen Management */
.screen {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  padding: 20px;
}

.screen.active {
  opacity: 1;
  visibility: visible;
}

.container {
  max-width: 600px;
  width: 100%;
  text-align: center;
  background: var(--surface-color);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  padding: 48px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
}

/* Typography */
.title {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: var(--glow-effect) var(--primary-glow);
  animation: titleGlow 3s ease-in-out infinite alternate;
}

@keyframes titleGlow {
  0% { filter: brightness(1); }
  100% { filter: brightness(1.2); }
}

.subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  font-weight: 300;
}

h2 {
  font-size: 2.5rem;
  margin-bottom: 32px;
  color: var(--text-primary);
  font-weight: 700;
}

/* Stats */
.stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-bottom: 48px;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
  background: linear-gradient(135deg, var(--surface-hover), var(--surface-color));
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.stat:hover {
  transform: translateY(-4px);
  box-shadow: var(--glow-effect) var(--primary-glow);
  border-color: var(--primary-color);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-value {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--text-accent), var(--warning-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 16px 32px;
  font-size: 1.1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
  min-width: 160px;
  margin: 10px;
  position: relative;
  overflow: hidden;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.btn::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 0.5s;
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  box-shadow: var(--glow-effect) var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 40px var(--primary-glow);
}

.btn-secondary {
  background: linear-gradient(135deg, var(--accent-color), var(--success-color));
  color: white;
  box-shadow: var(--glow-effect) var(--accent-glow);
}

.btn-secondary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 40px var(--accent-glow);
}

.btn-outline {
  background: transparent;
  color: var(--text-secondary);
  border: 2px solid var(--border-color);
  backdrop-filter: blur(10px);
}

.btn-outline:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
  box-shadow: var(--glow-effect) var(--primary-glow);
  transform: translateY(-2px);
}

/* Instructions */
.instructions {
  text-align: left;
  margin-bottom: 40px;
}

.instruction {
  display: flex;
  align-items: flex-start;
  margin-bottom: 24px;
  gap: 20px;
  padding: 16px;
  background: linear-gradient(135deg, var(--surface-hover), transparent);
  border-radius: var(--border-radius);
  border-left: 3px solid var(--primary-color);
}

.step {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
  box-shadow: var(--glow-effect) var(--primary-glow);
}

.instruction p {
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Game Screen */
#game-screen {
  flex-direction: column;
  padding: 20px;
  max-width: 100vw;
}

.game-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  max-width: 900px;
  margin-bottom: 32px;
  padding: 24px 32px;
  background: var(--surface-color);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  position: relative;
}

.game-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color), var(--secondary-color));
}

.level-info span {
  display: block;
}

#current-level {
  font-size: 1.8rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--text-accent), var(--warning-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

#game-status {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

.progress-info {
  text-align: right;
}

.progress-info span {
  display: block;
}

#progress {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
}

#timer {
  font-size: 1rem;
  color: var(--accent-color);
  font-weight: 600;
}

/* Maze */
#maze-container {
  display: flex;
  justify-content: center;
  margin-bottom: 32px;
}

#maze-grid {
  display: grid;
  gap: var(--grid-gap);
  padding: 24px;
  background: var(--surface-color);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  max-width: 90vw;
  overflow-x: auto;
  position: relative;
}

#maze-grid::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, transparent 49%, var(--border-glow) 50%, transparent 51%);
  opacity: 0.1;
  pointer-events: none;
}

.tile {
  width: var(--tile-size);
  height: var(--tile-size);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.8rem;
  position: relative;
  border: 2px solid transparent;
}

.tile:hover {
  transform: scale(1.1);
  z-index: 10;
}

.tile.wall {
  background: linear-gradient(135deg, #1f2937, #111827);
  cursor: not-allowed;
  border-color: #374151;
}

.tile.wall:hover {
  transform: none;
}

.tile.path {
  background: linear-gradient(135deg, var(--surface-hover), var(--surface-color));
  border-color: var(--border-color);
}

.tile.path:hover {
  border-color: var(--primary-color);
  box-shadow: var(--glow-effect) var(--primary-glow);
}

.tile.start {
  background: linear-gradient(135deg, var(--success-color), var(--success-hover));
  color: white;
  box-shadow: var(--glow-effect) var(--success-glow);
  border-color: var(--success-color);
}

.tile.finish {
  background: linear-gradient(135deg, var(--danger-color), var(--danger-hover));
  color: white;
  box-shadow: var(--glow-effect) var(--danger-glow);
  border-color: var(--danger-color);
}

.tile.highlighted {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  box-shadow: 0 0 30px var(--primary-glow);
  border-color: var(--primary-color);
  animation: highlightPulse 0.6s ease-in-out;
  transform: scale(1.15);
}

.tile.selected {
  background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
  color: white;
  box-shadow: var(--glow-effect) var(--accent-glow);
  border-color: var(--accent-color);
}

.tile.correct {
  background: linear-gradient(135deg, var(--success-color), var(--success-hover));
  color: white;
  animation: correctPulse 0.4s ease-in-out;
  box-shadow: 0 0 25px var(--success-glow);
}

.tile.wrong {
  background: linear-gradient(135deg, var(--danger-color), var(--danger-hover));
  color: white;
  animation: shake 0.6s ease-in-out;
  box-shadow: 0 0 25px var(--danger-glow);
}

@keyframes highlightPulse {
  0% { transform: scale(1); box-shadow: 0 0 10px var(--primary-glow); }
  50% { transform: scale(1.2); box-shadow: 0 0 40px var(--primary-glow); }
  100% { transform: scale(1.15); box-shadow: 0 0 30px var(--primary-glow); }
}

@keyframes correctPulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.3); box-shadow: 0 0 40px var(--success-glow); }
  100% { transform: scale(1); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  10%, 30%, 50%, 70%, 90% { transform: translateX(-8px); }
  20%, 40%, 60%, 80% { transform: translateX(8px); }
}

.game-controls {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

/* Win Screen */
.win-title {
  background: linear-gradient(135deg, var(--success-color), var(--text-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 40px;
  animation: winGlow 2s ease-in-out infinite alternate;
}

@keyframes winGlow {
  0% { filter: brightness(1); }
  100% { filter: brightness(1.3); }
}

.win-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-bottom: 40px;
}

.win-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px;
  background: linear-gradient(135deg, var(--surface-hover), var(--surface-color));
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  box-shadow: var(--glow-effect) var(--success-glow);
}

.win-stat .label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.win-stat .value {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--success-color), var(--text-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.win-controls {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

/* Game Over Screen */
.game-over-title {
  background: linear-gradient(135deg, var(--danger-color), var(--warning-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 24px;
}

.game-over-message {
  color: var(--text-secondary);
  margin-bottom: 40px;
  font-size: 1.1rem;
}

.game-over-controls {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

/* Responsive Design */
@media (max-width: 768px) {
  .title {
    font-size: 2.5rem;
  }
  
  .container {
    padding: 32px;
    margin: 16px;
  }
  
  .stats {
    gap: 32px;
  }
  
  .game-header {
    flex-direction: column;
    gap: 20px;
    text-align: center;
  }
  
  .progress-info {
    text-align: center;
  }
  
  :root {
    --tile-size: 48px;
  }
  
  .win-stats {
    gap: 32px;
  }
  
  .btn {
    min-width: 140px;
    font-size: 1rem;
    padding: 14px 28px;
  }
}

@media (max-width: 480px) {
  :root {
    --tile-size: 44px;
  }
  
  .title {
    font-size: 2rem;
  }
  
  .container {
    padding: 24px;
    margin: 12px;
  }
  
  .stats {
    flex-direction: column;
    gap: 20px;
  }
  
  .instructions {
    text-align: center;
  }
  
  .instruction {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 12px;
  }
  
  .win-stats {
    flex-direction: column;
    gap: 20px;
  }
  
  .game-controls,
  .win-controls,
  .game-over-controls {
    flex-direction: column;
    align-items: center;
  }
  
  .btn {
    width: 100%;
    max-width: 240px;
  }
}

/* Grid size adjustments */
.grid-4x4 { grid-template-columns: repeat(4, var(--tile-size)); }
.grid-5x5 { grid-template-columns: repeat(5, var(--tile-size)); }
.grid-6x6 { grid-template-columns: repeat(6, var(--tile-size)); }
.grid-7x7 { grid-template-columns: repeat(7, var(--tile-size)); }
.grid-8x8 { grid-template-columns: repeat(8, var(--tile-size)); }

/* Loading animation */
.loading {
  opacity: 0.7;
  pointer-events: none;
}

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

.tile:focus {
  outline: 3px solid var(--primary-color);
  outline-offset: 3px;
  box-shadow: var(--glow-effect) var(--primary-glow);
}

/* Additional gamification effects */
.screen.active {
  animation: screenSlideIn 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes screenSlideIn {
  0% {
    opacity: 0;
    transform: translateY(30px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Particle effect for background */
.container::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    radial-gradient(circle at 25% 25%, var(--primary-glow) 1px, transparent 1px),
    radial-gradient(circle at 75% 75%, var(--accent-glow) 1px, transparent 1px);
  background-size: 50px 50px;
  opacity: 0.1;
  pointer-events: none;
  animation: particleFloat 20s linear infinite;
}

@keyframes particleFloat {
  0% { transform: translateY(0px); }
  100% { transform: translateY(-100px); }
}