:root {
  --primary: #e67e22;
  --primary-light: #f39c12;
  --primary-dark: #d35400;
  --secondary: #00ff88;
  --accent: #9b59b6;
  --dark: #0a0a1a;
  --darker: #050510;
  --card-bg: rgba(20, 20, 40, 0.95);
  --success: #2ecc71;
  --warning: #f1c40f;
  --info: #3498db;
  --danger: #e74c3c;
}

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

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

.bg-animation {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background:
    radial-gradient(
      ellipse at 30% 20%,
      rgba(230, 126, 34, 0.1) 0%,
      transparent 50%
    ),
    radial-gradient(
      ellipse at 70% 80%,
      rgba(211, 84, 0, 0.08) 0%,
      transparent 50%
    );
}

.top-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 30px;
  background: var(--card-bg);
  border-bottom: 1px solid rgba(230, 126, 34, 0.3);
  position: sticky;
  top: 0;
  z-index: 100;
}

.back-btn {
  color: var(--primary-light);
  text-decoration: none;
  font-family: 'Orbitron', sans-serif;
  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(--warning));
  -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(--warning);
}

.level-selector {
  padding: 40px 20px;
  max-width: 1200px;
  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(220px, 1fr));
  gap: 20px;
}

.world-card {
  background: var(--card-bg);
  border-radius: 20px;
  padding: 25px;
  text-align: center;
  border: 2px solid rgba(230, 126, 34, 0.3);
  cursor: pointer;
  transition: all 0.4s;
}

.world-card:hover {
  transform: translateY(-8px);
  border-color: var(--primary);
  box-shadow: 0 15px 30px rgba(230, 126, 34, 0.2);
}

.world-card.locked {
  opacity: 0.5;
  cursor: not-allowed;
}
.world-card.locked:hover {
  transform: none;
  box-shadow: none;
}

.world-icon {
  font-size: 2.5rem;
  margin-bottom: 10px;
}
.world-card h3 {
  font-family: 'Orbitron', sans-serif;
  color: var(--primary-light);
  margin-bottom: 5px;
  font-size: 0.9rem;
}
.world-card p {
  color: #aaa;
  font-size: 0.85rem;
  margin-bottom: 10px;
}

.world-status {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 0.7rem;
  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 {
  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;
  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 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 20px;
}

.array-panel,
.carry-panel,
.info-panel {
  background: var(--card-bg);
  border-radius: 15px;
  padding: 20px;
  border: 1px solid rgba(230, 126, 34, 0.3);
}

.array-panel h3,
.carry-panel h3,
.info-panel h3,
.result-panel h3 {
  font-family: 'Orbitron', sans-serif;
  color: var(--warning);
  font-size: 1rem;
  margin-bottom: 15px;
}

.array-controls {
  display: flex;
  gap: 10px;
  margin-bottom: 15px;
  flex-wrap: wrap;
}

.array-controls input {
  flex: 1;
  min-width: 150px;
  padding: 10px;
  border: 1px solid var(--primary);
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.3);
  color: #fff;
  font-family: 'Fira Code', monospace;
}

.array-controls button {
  padding: 10px 15px;
  background: var(--primary);
  border: none;
  border-radius: 8px;
  color: #fff;
  cursor: pointer;
  font-weight: 600;
  transition: all 0.3s;
}

.array-controls button:hover {
  background: var(--primary-light);
}

.array-container {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 15px;
  padding: 15px;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 10px;
  min-height: 80px;
}

.array-element {
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(
    135deg,
    rgba(230, 126, 34, 0.3),
    rgba(211, 84, 0, 0.2)
  );
  border: 2px solid rgba(230, 126, 34, 0.5);
  border-radius: 10px;
  font-family: 'Fira Code', monospace;
  font-weight: 600;
  font-size: 1.1rem;
  position: relative;
  transition: all 0.3s;
}

.array-element .index {
  position: absolute;
  bottom: -18px;
  font-size: 0.65rem;
  color: #888;
}

.array-element.current {
  background: linear-gradient(
    135deg,
    rgba(0, 255, 136, 0.6),
    rgba(0, 200, 100, 0.5)
  );
  border-color: var(--secondary);
  box-shadow: 0 0 20px rgba(0, 255, 136, 0.5);
  transform: scale(1.15);
  animation: pulse 0.5s ease-in-out infinite alternate;
}

@keyframes pulse {
  from {
    transform: scale(1.1);
  }
  to {
    transform: scale(1.2);
  }
}

.array-element.processed {
  background: linear-gradient(
    135deg,
    rgba(155, 89, 182, 0.4),
    rgba(142, 68, 173, 0.3)
  );
  border-color: var(--accent);
}

.array-element.highlight {
  background: linear-gradient(
    135deg,
    rgba(241, 196, 15, 0.5),
    rgba(243, 156, 18, 0.4)
  );
  border-color: var(--warning);
}

.array-element.match {
  background: linear-gradient(
    135deg,
    rgba(46, 204, 113, 0.5),
    rgba(39, 174, 96, 0.4)
  );
  border-color: var(--success);
}

.current-info {
  display: flex;
  gap: 20px;
  font-size: 0.9rem;
  color: #aaa;
  justify-content: center;
}

.current-info strong {
  color: var(--secondary);
  font-family: 'Fira Code', monospace;
}

.carry-variables {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 15px;
}

.carry-var {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 10px;
  padding: 15px;
  text-align: center;
  border: 1px solid rgba(155, 89, 182, 0.3);
  transition: all 0.3s;
}

.carry-var.updated {
  border-color: var(--success);
  box-shadow: 0 0 15px rgba(46, 204, 113, 0.3);
  animation: flash 0.3s;
}

@keyframes flash {
  0%,
  100% {
    background: rgba(0, 0, 0, 0.3);
  }
  50% {
    background: rgba(46, 204, 113, 0.3);
  }
}

.var-name {
  display: block;
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 5px;
  font-family: 'Fira Code', monospace;
}

.var-value {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.5rem;
  color: var(--primary-light);
}

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

.action-buttons button {
  flex: 1;
  padding: 12px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-family: 'Orbitron', sans-serif;
  font-size: 0.85rem;
  transition: all 0.3s;
}

.action-buttons button:nth-child(1) {
  background: linear-gradient(135deg, var(--success), #27ae60);
  color: #fff;
}
.action-buttons button:nth-child(2) {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
}
.action-buttons button:nth-child(3) {
  background: linear-gradient(135deg, var(--info), #2980b9);
  color: #fff;
}
.action-buttons button:hover {
  transform: scale(1.05);
}

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

.decision-log {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 10px;
  padding: 15px;
  max-height: 150px;
  overflow-y: auto;
  font-family: 'Fira Code', monospace;
  font-size: 0.8rem;
}

.decision-entry {
  padding: 5px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.decision-entry.update {
  color: var(--success);
}
.decision-entry.check {
  color: var(--info);
}
.decision-entry.result {
  color: var(--warning);
}

.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;
}

.explanation-content {
  background: rgba(0, 0, 0, 0.2);
  border-radius: 10px;
  padding: 15px;
  margin-bottom: 15px;
  color: #bbb;
  line-height: 1.6;
  font-size: 0.9rem;
  max-height: 150px;
  overflow-y: auto;
}

.explanation-content strong {
  color: var(--primary-light);
}
.explanation-content code {
  background: rgba(230, 126, 34, 0.2);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'Fira Code', monospace;
  color: var(--warning);
}

.code-display h4 {
  color: var(--warning);
  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: 0.75rem;
  overflow-x: auto;
  color: #e0e0e0;
  line-height: 1.5;
  max-height: 150px;
}

.complexity-info {
  display: flex;
  gap: 20px;
  font-size: 0.85rem;
  color: #aaa;
  padding: 10px;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 8px;
  margin-top: 15px;
}

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

.result-panel {
  background: var(--card-bg);
  border-radius: 15px;
  padding: 20px;
  border: 1px solid rgba(230, 126, 34, 0.3);
  margin-top: 20px;
}

.result-display {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 10px;
  padding: 20px;
  text-align: center;
  font-family: 'Orbitron', sans-serif;
  font-size: 1.5rem;
  color: var(--success);
}

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

.sub-btn {
  padding: 12px 24px;
  border: 2px solid rgba(230, 126, 34, 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 {
  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: 2.5rem;
  color: var(--success);
  margin-bottom: 20px;
}
.complete-content p {
  font-size: 1.3rem;
  color: #ddd;
  margin-bottom: 20px;
}
.xp-earned {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.8rem;
  color: var(--warning);
}

.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: 1.1rem;
  cursor: pointer;
  transition: all 0.3s;
  margin-top: 20px;
}

.next-level-btn:hover {
  transform: scale(1.05);
}

@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;
  }
}