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

:root {
  --primary: #ff00ff;
  --secondary: #8b5cf6;
  --accent: #f59e0b;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --dark-bg: #0f0518;
  --card-bg: rgba(25, 10, 40, 0.95);
  --text: #ffffff;
  --text-dim: rgba(255, 255, 255, 0.6);
}

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

/* Background */
.bg-animation {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  overflow: hidden;
}

.bg-animation::before {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(
      ellipse at 20% 80%,
      rgba(255, 0, 255, 0.2) 0%,
      transparent 50%
    ),
    radial-gradient(
      ellipse at 80% 20%,
      rgba(139, 92, 246, 0.2) 0%,
      transparent 50%
    ),
    radial-gradient(
      ellipse at 50% 50%,
      rgba(245, 158, 11, 0.1) 0%,
      transparent 70%
    );
}

.particles {
  position: absolute;
  width: 100%;
  height: 100%;
  background-image:
    radial-gradient(circle, rgba(255, 0, 255, 0.3) 1px, transparent 1px),
    radial-gradient(circle, rgba(139, 92, 246, 0.3) 1px, transparent 1px);
  background-size:
    80px 80px,
    60px 60px;
  background-position:
    0 0,
    30px 30px;
  animation: particleFloat 20s linear infinite;
}

@keyframes particleFloat {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(-80px, -80px);
  }
}

/* Screens */
.screen {
  display: none;
  min-height: 100vh;
  padding: 20px;
}

.screen.active {
  display: block;
  animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Main Menu */
#main-menu {
  display: flex;
  align-items: center;
  justify-content: center;
}

.menu-content {
  text-align: center;
  max-width: 600px;
}

.logo-container {
  margin-bottom: 40px;
}

.logo-icon {
  font-size: 5rem;
  margin-bottom: 20px;
  animation: swordSwing 2s ease-in-out infinite;
}

@keyframes swordSwing {
  0%,
  100% {
    transform: rotate(-10deg);
  }
  50% {
    transform: rotate(10deg);
  }
}

.game-logo {
  font-family: 'Cinzel', serif;
  font-size: 3.5rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 0 60px rgba(255, 0, 255, 0.5);
  letter-spacing: 6px;
}

.game-subtitle {
  font-family: 'Cinzel', serif;
  font-size: 1.3rem;
  color: var(--text-dim);
  margin-top: 10px;
  letter-spacing: 4px;
}

.player-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-bottom: 50px;
  padding: 25px;
  background: var(--card-bg);
  border-radius: 16px;
  border: 1px solid rgba(255, 0, 255, 0.3);
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
}

.stat-icon {
  font-size: 1.5rem;
}

.stat-value {
  font-family: 'Cinzel', serif;
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.menu-buttons {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 18px 40px;
  font-family: 'Cinzel', serif;
  font-size: 1.1rem;
  font-weight: 600;
  border: 2px solid var(--primary);
  border-radius: 12px;
  background: transparent;
  color: var(--primary);
  cursor: pointer;
  transition: all 0.3s;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.menu-btn:hover {
  background: rgba(255, 0, 255, 0.1);
  transform: translateX(10px);
  box-shadow: 0 0 30px rgba(255, 0, 255, 0.3);
}

.menu-btn.primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border: none;
  color: #fff;
}

.menu-btn.primary:hover {
  transform: translateX(10px) scale(1.02);
}

/* Screen Header */
.screen-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px;
  margin-bottom: 30px;
  background: var(--card-bg);
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.screen-header h2 {
  font-family: 'Cinzel', serif;
  font-size: 1.8rem;
  color: var(--primary);
}

.back-btn {
  padding: 10px 20px;
  font-family: 'Rajdhani', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  color: var(--text);
  cursor: pointer;
  transition: all 0.3s;
}

.back-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateX(-5px);
}

.xp-display {
  font-family: 'Cinzel', serif;
  font-size: 1.1rem;
  color: var(--accent);
}

/* Kingdom Cards */
.kingdoms-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 25px;
  max-width: 1200px;
  margin: 0 auto;
}

.kingdom-card {
  position: relative;
  padding: 30px;
  background: var(--card-bg);
  border-radius: 20px;
  border: 2px solid rgba(255, 255, 255, 0.1);
  cursor: pointer;
  transition: all 0.4s;
  overflow: hidden;
}

.kingdom-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.kingdom-card:hover {
  transform: translateY(-10px);
  border-color: var(--primary);
  box-shadow: 0 20px 60px rgba(255, 0, 255, 0.3);
}

.kingdom-icon {
  font-size: 3.5rem;
  margin-bottom: 15px;
}

.kingdom-card h3 {
  font-family: 'Cinzel', serif;
  font-size: 1.4rem;
  color: var(--primary);
  margin-bottom: 10px;
}

.kingdom-card p {
  color: var(--text-dim);
  margin-bottom: 20px;
}

.kingdom-progress {
  display: flex;
  align-items: center;
  gap: 15px;
}

.progress-bar {
  flex: 1;
  height: 8px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--success));
  border-radius: 4px;
  transition: width 0.5s;
}

/* Level Select */
.levels-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  max-width: 1000px;
  margin: 0 auto;
}

.level-card {
  padding: 25px;
  background: var(--card-bg);
  border-radius: 16px;
  border: 2px solid rgba(255, 255, 255, 0.1);
  cursor: pointer;
  transition: all 0.3s;
  position: relative;
}

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

.level-card.completed {
  border-color: var(--success);
}

.level-card.completed::after {
  content: '✓';
  position: absolute;
  top: 15px;
  right: 15px;
  width: 30px;
  height: 30px;
  background: var(--success);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  color: #000;
}

.level-card:not(.locked):hover {
  transform: translateY(-5px);
  border-color: var(--primary);
  box-shadow: 0 15px 40px rgba(255, 0, 255, 0.2);
}

.level-number {
  font-family: 'Cinzel', serif;
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--primary);
  opacity: 0.3;
  margin-bottom: 10px;
}

.level-card h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}

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

.level-xp {
  margin-top: 15px;
  font-family: 'Cinzel', serif;
  font-size: 0.9rem;
  color: var(--accent);
}

/* Game Screen */
.game-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 15px 25px;
  background: var(--card-bg);
  border-radius: 16px;
  margin-bottom: 25px;
}

.level-info h2 {
  font-family: 'Cinzel', serif;
  font-size: 1.4rem;
  color: var(--primary);
}

.level-info p {
  font-size: 0.9rem;
  color: var(--text-dim);
}

.game-stats {
  display: flex;
  gap: 25px;
}

.game-stat {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 1rem;
}

.game-content {
  display: grid;
  grid-template-columns: 1fr 350px;
  gap: 20px;
  max-width: 1400px;
  margin: 0 auto;
}

/* Array Visualization */
.array-section {
  grid-column: 1 / -1;
  padding: 30px;
  background: var(--card-bg);
  border-radius: 16px;
}

.array-container {
  height: 300px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 4px;
  padding: 20px;
  background: rgba(0, 0, 0, 0.3);
  border-radius: 12px;
  margin-bottom: 15px;
}

.bar {
  width: 40px;
  min-width: 20px;
  background: linear-gradient(180deg, var(--primary), var(--secondary));
  border-radius: 4px 4px 0 0;
  transition: all 0.3s ease;
  position: relative;
}

.bar.comparing {
  background: var(--warning) !important;
  box-shadow: 0 0 20px var(--warning);
}

.bar.swapping {
  background: var(--danger) !important;
  box-shadow: 0 0 20px var(--danger);
  animation: swapPulse 0.3s ease;
}

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

.bar.sorted {
  background: linear-gradient(180deg, var(--success), #059669) !important;
}

.bar.pivot {
  background: var(--accent) !important;
  box-shadow: 0 0 20px var(--accent);
}

.bar.min {
  background: #06b6d4 !important;
  box-shadow: 0 0 20px #06b6d4;
}

.bar .bar-value {
  position: absolute;
  bottom: -25px;
  left: 50%;
  transform: translateX(-50%);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--text-dim);
}

.array-numbers {
  display: flex;
  justify-content: center;
  gap: 4px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  color: var(--text-dim);
}

/* Recursion Panel */
.recursion-panel {
  padding: 20px;
  background: var(--card-bg);
  border-radius: 16px;
  max-height: 400px;
  overflow-y: auto;
}

.recursion-panel h3 {
  color: var(--primary);
  margin-bottom: 15px;
  font-family: 'Cinzel', serif;
}

.tree-container {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
}

.tree-node {
  padding: 8px 12px;
  margin: 5px 0;
  background: rgba(255, 0, 255, 0.1);
  border-left: 3px solid var(--primary);
  border-radius: 0 8px 8px 0;
  animation: nodeSlide 0.3s ease-out;
}

@keyframes nodeSlide {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.tree-node.active {
  background: rgba(255, 0, 255, 0.3);
  border-left-color: var(--warning);
}

.tree-node.merged {
  background: rgba(16, 185, 129, 0.2);
  border-left-color: var(--success);
}

/* Control Panel */
.control-panel {
  padding: 20px;
  background: var(--card-bg);
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.speed-control {
  display: flex;
  align-items: center;
  gap: 15px;
}

.speed-control label {
  font-weight: 600;
  color: var(--text-dim);
}

.speed-control input[type='range'] {
  flex: 1;
  height: 6px;
  -webkit-appearance: none;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
}

.speed-control input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  background: var(--primary);
  border-radius: 50%;
  cursor: pointer;
}

.control-buttons {
  display: flex;
  gap: 10px;
}

.control-btn {
  flex: 1;
  padding: 12px;
  font-family: 'Rajdhani', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  border: 2px solid var(--primary);
  border-radius: 10px;
  background: transparent;
  color: var(--primary);
  cursor: pointer;
  transition: all 0.3s;
}

.control-btn:hover {
  background: rgba(255, 0, 255, 0.2);
}

/* Algorithm Panel */
.algo-panel {
  padding: 20px;
  background: var(--card-bg);
  border-radius: 16px;
}

.algo-panel h3 {
  font-family: 'Cinzel', serif;
  color: var(--primary);
  margin-bottom: 10px;
}

.algo-complexity {
  display: flex;
  gap: 20px;
  margin-bottom: 15px;
  font-size: 0.9rem;
}

.algo-complexity code {
  background: rgba(255, 0, 255, 0.2);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: 'JetBrains Mono', monospace;
}

.algo-step {
  padding: 15px;
  background: rgba(0, 0, 0, 0.3);
  border-radius: 10px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  line-height: 1.6;
}

/* Quiz Panel */
.quiz-panel {
  grid-column: 1 / -1;
  padding: 25px;
  background: var(--card-bg);
  border-radius: 16px;
  border: 2px solid var(--accent);
}

.quiz-question {
  font-size: 1.2rem;
  margin-bottom: 20px;
  color: var(--accent);
}

.quiz-options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 15px;
}

.quiz-option {
  padding: 15px 20px;
  background: rgba(255, 255, 255, 0.05);
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.3s;
  font-size: 1rem;
}

.quiz-option:hover {
  border-color: var(--primary);
  background: rgba(255, 0, 255, 0.1);
}

.quiz-option.correct {
  border-color: var(--success);
  background: rgba(16, 185, 129, 0.2);
}

.quiz-option.incorrect {
  border-color: var(--danger);
  background: rgba(239, 68, 68, 0.2);
}

/* Message Log */
.message-log {
  grid-column: 1 / -1;
  max-height: 150px;
  overflow-y: auto;
  padding: 20px;
  background: var(--card-bg);
  border-radius: 12px;
}

.log-message {
  padding: 8px 12px;
  margin-bottom: 8px;
  border-radius: 8px;
  font-size: 0.95rem;
  animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.log-message.info {
  background: rgba(139, 92, 246, 0.1);
  border-left: 3px solid var(--secondary);
}

.log-message.success {
  background: rgba(16, 185, 129, 0.1);
  border-left: 3px solid var(--success);
}

.log-message.error {
  background: rgba(239, 68, 68, 0.1);
  border-left: 3px solid var(--danger);
}

.log-message.warning {
  background: rgba(245, 158, 11, 0.1);
  border-left: 3px solid var(--warning);
}

/* Sandbox */
.sandbox-content {
  display: grid;
  grid-template-columns: 350px 1fr;
  gap: 25px;
  max-width: 1400px;
  margin: 0 auto;
}

.sandbox-controls {
  padding: 25px;
  background: var(--card-bg);
  border-radius: 16px;
}

.control-group {
  margin-bottom: 20px;
}

.control-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: var(--text-dim);
}

.control-group input,
.control-group select {
  width: 100%;
  padding: 12px 15px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 1rem;
  background: rgba(255, 255, 255, 0.05);
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  color: var(--text);
}

.control-group input:focus,
.control-group select:focus {
  outline: none;
  border-color: var(--primary);
}

.sandbox-buttons {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.sandbox-btn {
  padding: 12px;
  font-family: 'Rajdhani', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  border: 2px solid var(--primary);
  border-radius: 10px;
  background: transparent;
  color: var(--primary);
  cursor: pointer;
  transition: all 0.3s;
}

.sandbox-btn:hover {
  background: rgba(255, 0, 255, 0.2);
}

.sandbox-visualization {
  padding: 25px;
  background: var(--card-bg);
  border-radius: 16px;
}

.sandbox-bars {
  height: 300px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 4px;
  padding: 20px;
  background: rgba(0, 0, 0, 0.3);
  border-radius: 12px;
  margin-bottom: 20px;
}

.sandbox-info {
  display: flex;
  justify-content: center;
  gap: 40px;
  padding: 15px;
  background: rgba(255, 0, 255, 0.1);
  border-radius: 10px;
  margin-bottom: 20px;
  font-family: 'JetBrains Mono', monospace;
}

.sandbox-log {
  max-height: 200px;
  overflow-y: auto;
  padding: 15px;
  background: rgba(0, 0, 0, 0.3);
  border-radius: 10px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
}

/* Achievements */
.achievements-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.achievement-card {
  padding: 25px;
  background: var(--card-bg);
  border-radius: 16px;
  border: 2px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  gap: 20px;
}

.achievement-card.unlocked {
  border-color: var(--accent);
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), transparent);
}

.achievement-card.locked {
  opacity: 0.5;
}

.achievement-icon {
  font-size: 3rem;
  filter: grayscale(100%);
}

.achievement-card.unlocked .achievement-icon {
  filter: none;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.9);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.modal.active {
  display: flex;
}

.modal-content {
  padding: 40px;
  background: var(--card-bg);
  border-radius: 24px;
  border: 2px solid var(--primary);
  text-align: center;
  max-width: 500px;
  width: 90%;
}

.modal-content.victory {
  border-color: var(--success);
}

.victory-icon {
  font-size: 5rem;
  margin-bottom: 20px;
  animation: trophyBounce 0.6s ease-out;
}

@keyframes trophyBounce {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.2) rotate(10deg);
  }
}

.modal-content h2 {
  font-family: 'Cinzel', serif;
  font-size: 2rem;
  color: var(--success);
  margin-bottom: 25px;
}

.victory-stats {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin-bottom: 30px;
}

.victory-stat {
  text-align: center;
}

.victory-stat .stat-label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 5px;
}

.victory-stat .stat-value {
  font-family: 'Cinzel', serif;
  font-size: 1.5rem;
  color: var(--primary);
}

.modal-buttons {
  display: flex;
  gap: 15px;
  justify-content: center;
}

.modal-btn {
  padding: 15px 30px;
  font-family: 'Cinzel', serif;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  background: linear-gradient(135deg, var(--primary), var(--success));
  color: #fff;
}

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

.modal-btn.secondary {
  background: rgba(255, 255, 255, 0.1);
  border: 2px solid rgba(255, 255, 255, 0.2);
}

/* Tutorial */
.modal-content.tutorial {
  border-color: var(--secondary);
  text-align: left;
}

.modal-content.tutorial h2 {
  color: var(--secondary);
  text-align: center;
}

#tutorial-content {
  margin-bottom: 25px;
  line-height: 1.8;
}

#tutorial-content p {
  margin-bottom: 15px;
}

#tutorial-content code {
  background: rgba(255, 0, 255, 0.2);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: 'JetBrains Mono', monospace;
}

/* Responsive */
@media (max-width: 1024px) {
  .game-content {
    grid-template-columns: 1fr;
  }

  .sandbox-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .game-logo {
    font-size: 2.2rem;
  }

  .player-stats {
    flex-wrap: wrap;
    gap: 20px;
  }

  .bar {
    width: 25px;
    min-width: 15px;
  }

  .quiz-options {
    grid-template-columns: 1fr;
  }
}