:root {
  --primary: #3498db;
  --primary-light: #5dade2;
  --primary-dark: #2980b9;
  --secondary: #00ff88;
  --accent: #00ffff;
  --dark: #0a0a1a;
  --darker: #050510;
  --card-bg: rgba(20, 20, 40, 0.95);
  --success: #2ecc71;
  --warning: #f39c12;
  --danger: #e74c3c;
}

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

body {
  font-family: 'Rajdhani', sans-serif;
  background: var(--darker);
  min-height: 100vh;
  overflow-x: hidden;
  color: #fff;
}

.bg-animation {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background:
    radial-gradient(
      ellipse at 20% 20%,
      rgba(52, 152, 219, 0.15) 0%,
      transparent 50%
    ),
    radial-gradient(
      ellipse at 80% 80%,
      rgba(41, 128, 185, 0.1) 0%,
      transparent 50%
    );
}

.grid-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background-image:
    linear-gradient(rgba(52, 152, 219, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(52, 152, 219, 0.05) 1px, transparent 1px);
  background-size: 40px 40px;
}

/* Navigation */
.top-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 30px;
  background: var(--card-bg);
  border-bottom: 1px solid rgba(52, 152, 219, 0.3);
  position: sticky;
  top: 0;
  z-index: 100;
}

.back-btn {
  color: var(--primary-light);
  text-decoration: none;
  font-family: 'Orbitron', sans-serif;
  font-size: 0.9rem;
  padding: 8px 16px;
  border: 1px solid var(--primary);
  border-radius: 20px;
  transition: all 0.3s;
}

.back-btn:hover {
  background: var(--primary);
  color: #fff;
}

.nav-title {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.5rem;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-stats {
  display: flex;
  gap: 20px;
  font-family: 'Orbitron', sans-serif;
}

.xp-counter {
  color: var(--secondary);
}
.level-indicator {
  color: var(--accent);
}

/* Level Selector */
.level-selector {
  padding: 40px 20px;
  max-width: 1400px;
  margin: 0 auto;
}

.section-title {
  font-family: 'Orbitron', sans-serif;
  font-size: 2rem;
  text-align: center;
  color: var(--primary-light);
  margin-bottom: 40px;
}

.worlds-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}

.world-card {
  background: var(--card-bg);
  border-radius: 20px;
  padding: 25px;
  text-align: center;
  border: 2px solid rgba(52, 152, 219, 0.3);
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.world-card:hover {
  transform: translateY(-8px);
  border-color: var(--primary);
  box-shadow: 0 15px 30px rgba(52, 152, 219, 0.3);
}

.world-card.locked {
  opacity: 0.5;
  cursor: not-allowed;
}

.world-card.locked:hover {
  transform: none;
  box-shadow: none;
}

.world-icon {
  font-size: 3rem;
  margin-bottom: 10px;
}
.world-card h3 {
  font-family: 'Orbitron', sans-serif;
  color: var(--primary-light);
  margin-bottom: 8px;
}
.world-card p {
  color: #aaa;
  margin-bottom: 12px;
  font-size: 0.9rem;
}

.world-status {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
  background: rgba(231, 76, 60, 0.2);
  color: var(--danger);
}

.world-status.unlocked {
  background: rgba(46, 204, 113, 0.2);
  color: var(--success);
}

/* Game Area */
.game-area {
  padding: 20px;
  max-width: 1600px;
  margin: 0 auto;
}

.game-header {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.back-to-levels {
  background: transparent;
  border: 1px solid var(--primary);
  color: var(--primary-light);
  padding: 8px 16px;
  border-radius: 20px;
  cursor: pointer;
  font-family: 'Rajdhani', sans-serif;
  transition: all 0.3s;
}

.back-to-levels:hover {
  background: var(--primary);
  color: #fff;
}

.level-title {
  font-family: 'Orbitron', sans-serif;
  color: var(--primary-light);
  flex: 1;
}

.level-progress {
  width: 200px;
  height: 8px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  width: 0%;
  transition: width 0.5s;
}

/* Game Container */
.game-container {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 20px;
}

/* Matrix Panel */
.matrix-panel {
  background: var(--card-bg);
  border-radius: 15px;
  padding: 20px;
  border: 1px solid rgba(52, 152, 219, 0.3);
}

.matrix-panel h3,
.control-panel h3,
.info-panel h3 {
  font-family: 'Orbitron', sans-serif;
  color: var(--accent);
  font-size: 1rem;
  margin-bottom: 15px;
}

.matrix-controls {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 15px;
  align-items: center;
}

.matrix-controls label {
  color: #aaa;
  font-size: 0.9rem;
}

.matrix-controls input {
  width: 50px;
  padding: 6px;
  border: 1px solid var(--primary);
  border-radius: 5px;
  background: rgba(0, 0, 0, 0.3);
  color: #fff;
  font-family: 'Fira Code', monospace;
  text-align: center;
}

.matrix-controls button {
  padding: 8px 15px;
  background: var(--primary);
  border: none;
  border-radius: 5px;
  color: #fff;
  cursor: pointer;
  font-family: 'Rajdhani', sans-serif;
  font-weight: 600;
  transition: all 0.3s;
}

.matrix-controls button:hover {
  background: var(--primary-light);
  transform: scale(1.05);
}

/* Matrix Grid */
.matrix-container {
  display: inline-grid;
  gap: 3px;
  background: rgba(0, 0, 0, 0.3);
  padding: 10px;
  border-radius: 10px;
  margin-bottom: 15px;
}

.matrix-cell {
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(52, 152, 219, 0.2);
  border: 2px solid rgba(52, 152, 219, 0.3);
  border-radius: 8px;
  font-family: 'Fira Code', monospace;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.3s;
  cursor: pointer;
  position: relative;
}

.matrix-cell:hover {
  border-color: var(--accent);
  background: rgba(0, 255, 255, 0.2);
}

.matrix-cell.highlight {
  background: rgba(52, 152, 219, 0.6);
  border-color: var(--primary);
  transform: scale(1.1);
  z-index: 10;
}

.matrix-cell.current {
  background: rgba(0, 255, 136, 0.6);
  border-color: var(--secondary);
  box-shadow: 0 0 15px var(--secondary);
  animation: pulse 0.5s ease-in-out infinite alternate;
}

@keyframes pulse {
  from {
    transform: scale(1);
  }
  to {
    transform: scale(1.1);
  }
}

.matrix-cell.visited {
  background: rgba(155, 89, 182, 0.4);
  border-color: #9b59b6;
}

.matrix-cell.boundary {
  background: rgba(241, 196, 15, 0.5);
  border-color: var(--warning);
}

.matrix-cell.selected {
  background: rgba(231, 76, 60, 0.5);
  border-color: var(--danger);
}

.matrix-cell.submatrix {
  background: rgba(46, 204, 113, 0.5);
  border-color: var(--success);
}

.matrix-cell .index {
  position: absolute;
  top: 2px;
  left: 2px;
  font-size: 0.6rem;
  color: #888;
}

.matrix-info {
  display: flex;
  gap: 20px;
  font-size: 0.9rem;
  color: #aaa;
}

.matrix-info strong {
  color: var(--accent);
}

/* Control Panel */
.control-panel {
  background: var(--card-bg);
  border-radius: 15px;
  padding: 20px;
  border: 1px solid rgba(52, 152, 219, 0.3);
}

.challenge-info {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 10px;
  padding: 15px;
  margin-bottom: 15px;
}

.challenge-info h4 {
  color: var(--primary-light);
  font-family: 'Orbitron', sans-serif;
  font-size: 1rem;
  margin-bottom: 8px;
}

.challenge-info p {
  color: #aaa;
  font-size: 0.9rem;
  line-height: 1.5;
}

.action-buttons {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 15px;
}

.action-btn {
  flex: 1;
  min-width: 100px;
  padding: 12px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-family: 'Orbitron', sans-serif;
  font-size: 0.8rem;
  transition: all 0.3s;
}

.action-btn:nth-child(1) {
  background: linear-gradient(135deg, var(--success), #27ae60);
  color: #fff;
}

.action-btn:nth-child(2) {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
}

.action-btn:nth-child(3) {
  background: linear-gradient(135deg, var(--warning), #e67e22);
  color: #fff;
}

.action-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 0 15px rgba(0, 0, 0, 0.3);
}

.traversal-output h4,
.query-panel h4 {
  color: var(--accent);
  font-size: 0.9rem;
  margin-bottom: 10px;
}

.output-display {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 8px;
  padding: 15px;
  font-family: 'Fira Code', monospace;
  font-size: 0.85rem;
  min-height: 80px;
  max-height: 150px;
  overflow-y: auto;
  color: var(--secondary);
}

.query-panel {
  margin-top: 15px;
  padding-top: 15px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.query-inputs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 10px;
}

.query-inputs label {
  color: #aaa;
  font-size: 0.85rem;
}

.query-inputs input {
  width: 40px;
  padding: 5px;
  border: 1px solid var(--primary);
  border-radius: 5px;
  background: rgba(0, 0, 0, 0.3);
  color: #fff;
  font-family: 'Fira Code', monospace;
  text-align: center;
}

.query-inputs button {
  padding: 8px 15px;
  background: var(--primary);
  border: none;
  border-radius: 5px;
  color: #fff;
  cursor: pointer;
  font-family: 'Rajdhani', sans-serif;
  font-weight: 600;
}

.query-result {
  background: rgba(0, 0, 0, 0.3);
  padding: 10px;
  border-radius: 8px;
  font-family: 'Fira Code', monospace;
  color: var(--warning);
}

/* Info Panel */
.info-panel {
  background: var(--card-bg);
  border-radius: 15px;
  padding: 20px;
  border: 1px solid rgba(52, 152, 219, 0.3);
}

.explanation-content {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 10px;
  padding: 15px;
  margin-bottom: 15px;
  color: #bbb;
  line-height: 1.6;
  font-size: 0.9rem;
}

.explanation-content strong {
  color: var(--primary-light);
}
.explanation-content code {
  background: rgba(52, 152, 219, 0.2);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'Fira Code', monospace;
  color: var(--accent);
}

.code-display {
  margin-bottom: 15px;
}

.code-display h4 {
  color: var(--accent);
  font-size: 0.9rem;
  margin-bottom: 10px;
}

.code-display pre {
  background: rgba(0, 0, 0, 0.5);
  border-radius: 8px;
  padding: 15px;
  font-family: 'Fira Code', monospace;
  font-size: 0.8rem;
  overflow-x: auto;
  color: #e0e0e0;
  line-height: 1.6;
}

.complexity-info {
  display: flex;
  gap: 20px;
  font-size: 0.85rem;
  color: #aaa;
  padding: 10px;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 8px;
}

.complexity-info strong {
  color: var(--warning);
}

/* Sub Challenges */
.sub-challenges {
  display: flex;
  gap: 10px;
  margin-top: 20px;
  flex-wrap: wrap;
  justify-content: center;
}

.sub-btn {
  padding: 12px 24px;
  border: 2px solid rgba(52, 152, 219, 0.5);
  background: transparent;
  color: #aaa;
  border-radius: 25px;
  cursor: pointer;
  font-family: 'Rajdhani', sans-serif;
  font-size: 1rem;
  transition: all 0.3s;
}

.sub-btn:hover {
  border-color: var(--primary);
  color: var(--primary-light);
}

.sub-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.sub-btn.completed {
  border-color: var(--success);
  color: var(--success);
}

.sub-btn.completed::after {
  content: ' ✓';
}

/* Complete Modal */
.complete-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.complete-content {
  text-align: center;
  animation: scaleIn 0.5s ease-out;
}

@keyframes scaleIn {
  from {
    transform: scale(0.5);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

.complete-content h2 {
  font-family: 'Orbitron', sans-serif;
  font-size: 3rem;
  color: var(--success);
  margin-bottom: 20px;
}

.complete-content p {
  font-size: 1.5rem;
  color: #ddd;
  margin-bottom: 30px;
}

.xp-earned {
  font-family: 'Orbitron', sans-serif;
  font-size: 2rem;
  color: var(--warning);
  animation: pulse 1s infinite;
}

.next-level-btn {
  padding: 15px 40px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  border: none;
  border-radius: 30px;
  font-family: 'Orbitron', sans-serif;
  font-size: 1.2rem;
  cursor: pointer;
  transition: all 0.3s;
  margin-top: 20px;
}

.next-level-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 0 30px rgba(52, 152, 219, 0.5);
}

/* Responsive */
@media (max-width: 1200px) {
  .game-container {
    grid-template-columns: 1fr 1fr;
  }
  .info-panel {
    grid-column: span 2;
  }
}

@media (max-width: 768px) {
  .game-container {
    grid-template-columns: 1fr;
  }
  .info-panel {
    grid-column: span 1;
  }
  .top-nav {
    flex-direction: column;
    gap: 10px;
  }
  .matrix-cell {
    width: 40px;
    height: 40px;
    font-size: 0.85rem;
  }
}