/* ====================================================================
   TREE REALMS - Game Screen Stylesheet
   ==================================================================== */

/* ====================================================================
   GAME SCREEN LAYOUT
   ==================================================================== */

#game-screen {
  display: flex;
  flex-direction: column;
  background: var(--gradient-dark);
}

.game-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  background: rgba(0, 0, 0, 0.4);
  border-bottom: var(--border-subtle);
  z-index: 10;
}

.game-header-left,
.game-header-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.game-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-card);
  border: var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.level-info {
  display: flex;
  flex-direction: column;
}

.level-name {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.level-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.game-header-center {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.score-display {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.score-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.score-value {
  font-family: var(--font-display);
  font-size: 1.8rem;
  color: var(--accent-gold);
  font-weight: 700;
}

.hints-remaining {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(0, 0, 0, 0.3);
  border-radius: var(--radius-md);
}

.hint-icon {
  font-size: 1.1rem;
}

.hint-count {
  font-weight: 600;
  color: var(--accent-gold);
}

/* ====================================================================
   GAME MAIN AREA
   ==================================================================== */

.game-main {
  flex: 1;
  display: flex;
  position: relative;
  overflow: hidden;
}

/* Tutorial Panel */
.tutorial-panel {
  position: absolute;
  top: 0;
  right: 0;
  width: 400px;
  height: 100%;
  background: var(--bg-medium);
  border-left: var(--border-subtle);
  z-index: 20;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.4s ease;
}

.tutorial-panel.active {
  transform: translateX(0);
}

.tutorial-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  background: rgba(0, 0, 0, 0.3);
  border-bottom: var(--border-subtle);
}

.tutorial-header h2 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--primary);
}

.close-btn {
  width: 32px;
  height: 32px;
  background: transparent;
  border: var(--border-subtle);
  border-radius: var(--radius-full);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.close-btn:hover {
  border-color: var(--accent-red);
  color: var(--accent-red);
}

.tutorial-content {
  flex: 1;
  padding: var(--spacing-lg);
  overflow-y: auto;
}

.tutorial-content h3 {
  color: var(--accent-cyan);
  margin-bottom: var(--spacing-md);
}

.tutorial-content p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
}

.tutorial-content code {
  background: var(--bg-dark);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-family: 'Consolas', monospace;
  color: var(--accent-gold);
}

.tutorial-content pre {
  background: var(--bg-dark);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: var(--spacing-md) 0;
}

.tutorial-content pre code {
  background: transparent;
  padding: 0;
}

.concept-box {
  background: rgba(74, 222, 128, 0.1);
  border: 1px solid rgba(74, 222, 128, 0.3);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin: var(--spacing-md) 0;
}

.concept-box h4 {
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
  font-size: 0.9rem;
}

/* ====================================================================
   VISUALIZATION AREA
   ==================================================================== */

.visualization-area {
  flex: 1;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

#tree-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.tree-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.tree-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* Node Styling */
.tree-node {
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--bg-dark);
  cursor: pointer;
  pointer-events: all;
  transition: all 0.3s ease;
  z-index: 10;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
  transform: translate(-50%, -50%);
}

.tree-node:hover {
  transform: translate(-50%, -50%) scale(1.1);
  box-shadow: 0 6px 25px rgba(74, 222, 128, 0.4);
}

.tree-node.selected {
  background: var(--gradient-gold);
  box-shadow: 0 0 30px rgba(251, 191, 36, 0.5);
  transform: translate(-50%, -50%) scale(1.15);
}

.tree-node.visited {
  background: var(--secondary);
}

.tree-node.correct {
  background: var(--node-correct) !important;
  animation: correct-flash 0.5s ease;
}

.tree-node.wrong {
  background: var(--node-wrong) !important;
  animation: wrong-flash 0.5s ease;
}

.tree-node.highlighted {
  box-shadow:
    0 0 0 4px var(--accent-purple),
    0 0 30px rgba(167, 139, 250, 0.5);
}

.tree-node.path {
  background: var(--accent-purple);
  box-shadow: 0 0 20px rgba(167, 139, 250, 0.5);
}

.tree-node.lca {
  background: var(--accent-gold);
  box-shadow: 0 0 25px rgba(251, 191, 36, 0.6);
  transform: translate(-50%, -50%) scale(1.2);
}

.tree-node.bst-invalid {
  background: var(--node-wrong);
  animation: shake 0.5s ease;
}

.tree-node.null-node {
  background: var(--bg-light);
  border: 2px dashed var(--text-muted);
  color: var(--text-muted);
  font-size: 0.9rem;
  width: 40px;
  height: 40px;
}

/* Node Label */
.node-label {
  position: absolute;
  bottom: -20px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
}

/* Edge Styling */
.tree-edge {
  stroke: var(--text-muted);
  stroke-width: 2;
  fill: none;
  transition: all 0.3s ease;
}

.tree-edge.highlighted {
  stroke: var(--primary);
  stroke-width: 3;
}

.tree-edge.path {
  stroke: var(--accent-purple);
  stroke-width: 4;
}

.tree-edge.traversing {
  stroke: var(--accent-gold);
  stroke-width: 4;
  stroke-dasharray: 8 4;
  animation: edge-flow 0.5s linear infinite;
}

/* ====================================================================
   SIDE PANEL
   ==================================================================== */

.side-panel {
  width: 250px;
  background: var(--bg-medium);
  border-left: var(--border-subtle);
  display: flex;
  flex-direction: column;
  transition: width 0.3s ease;
}

.side-panel.collapsed {
  width: 0;
  overflow: hidden;
}

.panel-header {
  padding: var(--spacing-md);
  background: rgba(0, 0, 0, 0.3);
  border-bottom: var(--border-subtle);
}

.panel-header h3 {
  font-size: 1rem;
  color: var(--accent-cyan);
}

.panel-content {
  flex: 1;
  padding: var(--spacing-md);
  overflow-y: auto;
}

/* Stack Visualization */
.stack-visualization {
  display: flex;
  flex-direction: column-reverse;
  gap: var(--spacing-xs);
  min-height: 200px;
}

.stack-item {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-card);
  border: var(--border-subtle);
  border-radius: var(--radius-sm);
  text-align: center;
  font-weight: 600;
  color: var(--text-primary);
}

.stack-item:last-child {
  background: var(--primary);
  color: var(--bg-dark);
  border-color: var(--primary);
}

.stack-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: var(--spacing-xs);
}

/* Queue Visualization */
.queue-visualization {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.queue-item {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-card);
  border: var(--border-subtle);
  border-radius: var(--radius-sm);
  font-weight: 600;
  color: var(--text-primary);
}

.queue-item:first-child {
  background: var(--accent-cyan);
  color: var(--bg-dark);
  border-color: var(--accent-cyan);
}

/* ====================================================================
   CHALLENGE AREA
   ==================================================================== */

.challenge-area {
  background: rgba(0, 0, 0, 0.4);
  border-top: var(--border-subtle);
  padding: var(--spacing-lg);
}

.challenge-instruction {
  text-align: center;
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.challenge-progress {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.expected-sequence,
.user-sequence {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  background: var(--bg-dark);
  border-radius: var(--radius-md);
  min-height: 50px;
  flex-wrap: wrap;
}

.expected-sequence::before,
.user-sequence::before {
  content: attr(data-label);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  width: 80px;
}

.sequence-item {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--bg-card);
  border: var(--border-subtle);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-primary);
  transition: all 0.3s ease;
}

.sequence-item.correct {
  background: var(--node-correct);
  border-color: var(--node-correct);
  color: var(--bg-dark);
}

.sequence-item.wrong {
  background: var(--node-wrong);
  border-color: var(--node-wrong);
  color: white;
}

.sequence-item.pending {
  background: transparent;
  border-style: dashed;
}

.sequence-arrow {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.challenge-controls {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
}

.control-btn {
  padding: var(--spacing-sm) var(--spacing-xl);
  background: var(--bg-card);
  border: var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.control-btn.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--bg-dark);
  font-weight: 600;
}

.control-btn.primary:hover {
  background: var(--primary-dark);
}

/* ====================================================================
   CODE PANEL
   ==================================================================== */

.code-panel {
  position: absolute;
  bottom: 100px;
  left: 0;
  width: 350px;
  max-height: 300px;
  background: var(--bg-medium);
  border-right: var(--border-subtle);
  border-top: var(--border-subtle);
  border-radius: 0 var(--radius-lg) 0 0;
  overflow: hidden;
  transition: transform 0.3s ease;
  z-index: 15;
}

.code-panel.collapsed {
  transform: translateX(-300px);
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(0, 0, 0, 0.3);
  border-bottom: var(--border-subtle);
}

.code-title {
  font-size: 0.85rem;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.toggle-code {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  transition: transform 0.3s ease;
}

.code-panel.collapsed .toggle-code {
  transform: rotate(180deg);
}

.code-content {
  padding: var(--spacing-md);
  overflow-y: auto;
  max-height: 250px;
}

.code-content pre {
  font-family: 'Consolas', 'Monaco', monospace;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--text-secondary);
  margin: 0;
}

.code-line {
  display: block;
  padding: 2px var(--spacing-sm);
  border-left: 3px solid transparent;
  transition: all 0.2s ease;
}

.code-line.active {
  background: rgba(74, 222, 128, 0.15);
  border-left-color: var(--primary);
  color: var(--text-primary);
}

.code-line .keyword {
  color: var(--accent-purple);
}

.code-line .function {
  color: var(--accent-cyan);
}

.code-line .string {
  color: var(--accent-gold);
}

.code-line .number {
  color: var(--accent-red);
}

.code-line .comment {
  color: var(--text-muted);
  font-style: italic;
}

/* ====================================================================
   ACHIEVEMENTS SCREEN
   ==================================================================== */

#achievements-screen {
  background: var(--gradient-dark);
  display: flex;
  flex-direction: column;
}

.achievements-container {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  padding: var(--spacing-xl);
  overflow-y: auto;
}

.achievement-card {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: var(--gradient-card);
  border: var(--border-subtle);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
}

.achievement-card.unlocked {
  border-color: var(--accent-gold);
}

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

.achievement-icon {
  font-size: 2.5rem;
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.3);
  border-radius: var(--radius-full);
}

.achievement-card.locked .achievement-icon {
  filter: grayscale(1);
}

.achievement-info h3 {
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

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

/* ====================================================================
   CODEX SCREEN
   ==================================================================== */

#codex-screen {
  background: var(--gradient-dark);
  display: flex;
  flex-direction: column;
}

.codex-container {
  flex: 1;
  display: flex;
  overflow: hidden;
}

.codex-sidebar {
  width: 280px;
  background: var(--bg-medium);
  border-right: var(--border-subtle);
  overflow-y: auto;
  padding: var(--spacing-md);
}

.codex-category {
  margin-bottom: var(--spacing-lg);
}

.codex-category h3 {
  font-size: 1rem;
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
  padding: var(--spacing-sm);
  border-bottom: var(--border-subtle);
}

.codex-category ul {
  list-style: none;
}

.codex-category li {
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.codex-category li:hover {
  background: var(--bg-light);
  color: var(--text-primary);
}

.codex-category li.active {
  background: var(--primary);
  color: var(--bg-dark);
}

.codex-content {
  flex: 1;
  padding: var(--spacing-xl);
  overflow-y: auto;
}

.codex-content h2 {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: var(--spacing-lg);
}

.codex-content h3 {
  font-size: 1.3rem;
  color: var(--accent-cyan);
  margin: var(--spacing-lg) 0 var(--spacing-md);
}

.codex-content p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--spacing-md);
}

.codex-content code {
  background: var(--bg-dark);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-family: 'Consolas', monospace;
  color: var(--accent-gold);
}

.codex-content pre {
  background: var(--bg-dark);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: var(--spacing-md) 0;
  border: var(--border-subtle);
}

.codex-content pre code {
  background: transparent;
  padding: 0;
  display: block;
  line-height: 1.6;
}

.codex-diagram {
  background: var(--bg-dark);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  margin: var(--spacing-md) 0;
  text-align: center;
  font-family: monospace;
  line-height: 1.4;
  color: var(--primary);
}

/* ====================================================================
   BST SPECIFIC STYLES
   ==================================================================== */

.bst-range {
  position: absolute;
  top: -25px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.7rem;
  color: var(--text-muted);
  white-space: nowrap;
  background: var(--bg-dark);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

.comparison-arrow {
  position: absolute;
  font-size: 1.5rem;
  color: var(--accent-gold);
  animation: bounce 0.5s ease infinite;
}

/* ====================================================================
   TREE MAP STYLES
   ==================================================================== */

.treemap-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  background: var(--bg-dark);
  border-radius: var(--radius-md);
}

.treemap-entry {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-card);
  border-radius: var(--radius-sm);
}

.treemap-key {
  font-weight: 600;
  color: var(--primary);
  min-width: 60px;
}

.treemap-value {
  color: var(--text-secondary);
}

/* ====================================================================
   RESPONSIVE DESIGN
   ==================================================================== */

@media (max-width: 1024px) {
  .side-panel {
    width: 200px;
  }

  .tutorial-panel {
    width: 350px;
  }

  .code-panel {
    width: 300px;
  }
}

@media (max-width: 768px) {
  .game-header {
    flex-wrap: wrap;
    gap: var(--spacing-sm);
  }

  .game-header-center {
    position: static;
    transform: none;
    order: -1;
    width: 100%;
    text-align: center;
  }

  .side-panel {
    position: absolute;
    right: 0;
    top: 0;
    height: 100%;
    width: 250px;
    transform: translateX(100%);
    z-index: 25;
  }

  .side-panel.active {
    transform: translateX(0);
  }

  .code-panel {
    width: 100%;
    max-width: 100%;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  }

  .code-panel.collapsed {
    transform: translateY(calc(100% - 40px));
  }

  .tutorial-panel {
    width: 100%;
  }

  .tree-node {
    width: 40px;
    height: 40px;
    font-size: 0.9rem;
  }

  .challenge-area {
    padding: var(--spacing-md);
  }

  .challenge-controls {
    flex-wrap: wrap;
  }
}