/* ============================================
   STACK ADVENTURES - Complete Stylesheet
   ============================================ */

/* CSS Variables */
:root {
  --bg-dark: #0a0e17;
  --bg-darker: #050810;
  --bg-card: #111827;
  --bg-card-hover: #1a2332;
  --primary: #00f5d4;
  --primary-dim: #00c4aa;
  --secondary: #ff6b6b;
  --accent: #ffd93d;
  --accent-blue: #6c5ce7;
  --purple: #a855f7;
  --pink: #ec4899;
  --text-primary: #f0f4f8;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --border: #1e293b;
  --glow-primary: 0 0 20px rgba(0, 245, 212, 0.4);
  --glow-secondary: 0 0 20px rgba(255, 107, 107, 0.4);
  --glow-accent: 0 0 20px rgba(255, 217, 61, 0.4);
  --font-display: 'Orbitron', sans-serif;
  --font-body: 'Rajdhani', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

/* Reset & Base */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--bg-dark);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  background-image:
    radial-gradient(
      ellipse at 20% 50%,
      rgba(0, 245, 212, 0.05) 0%,
      transparent 50%
    ),
    radial-gradient(
      ellipse at 80% 80%,
      rgba(168, 85, 247, 0.05) 0%,
      transparent 50%
    );
}

/* App Container */
.app-container {
  display: flex;
  min-height: 100vh;
}

/* Sidebar Navigation */
.sidebar {
  width: 280px;
  background: var(--bg-darker);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  z-index: 100;
  overflow-y: auto;
}

.logo {
  padding: 1.5rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(
    180deg,
    rgba(0, 245, 212, 0.1) 0%,
    transparent 100%
  );
}

.logo-icon {
  font-size: 3rem;
  margin-bottom: 0.5rem;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

.logo h1 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.3;
}

.game-list {
  list-style: none;
  padding: 1rem 0;
  flex: 1;
}

.game-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1.25rem;
  cursor: pointer;
  transition: all 0.3s ease;
  border-left: 3px solid transparent;
}

.game-item:hover {
  background: var(--bg-card-hover);
  border-left-color: var(--primary-dim);
}

.game-item.active {
  background: linear-gradient(
    90deg,
    rgba(0, 245, 212, 0.15) 0%,
    transparent 100%
  );
  border-left-color: var(--primary);
}

.game-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--primary);
  font-weight: 700;
  min-width: 24px;
}

.game-title {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.3s;
}

.game-item:hover .game-title,
.game-item.active .game-title {
  color: var(--text-primary);
}

.sidebar-footer {
  padding: 1rem;
  text-align: center;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.8rem;
}

.sidebar-footer .version {
  color: var(--primary);
  margin-top: 0.25rem;
}

/* Main Game Container */
.game-container {
  flex: 1;
  margin-left: 280px;
  min-height: 100vh;
}

.game-panel {
  display: none;
  min-height: 100vh;
  padding: 2rem;
  animation: fadeIn 0.4s ease;
}

.game-panel.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Game Header */
.game-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.game-name {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  text-shadow: var(--glow-primary);
}

.game-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
}

/* Game Content Area */
.game-content {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* ============================================
   GAME 1: Tower of Plates
   ============================================ */
.game-area-wrapper {
  display: flex;
  gap: 2rem;
  min-height: 400px;
}

.stack-visualization {
  flex: 1;
  background: linear-gradient(180deg, var(--bg-card) 0%, var(--bg-darker) 100%);
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 1.5rem;
  display: flex;
  flex-direction: column-reverse;
  align-items: center;
  min-height: 400px;
  position: relative;
  overflow: hidden;
}

.stack-base {
  width: 200px;
  height: 20px;
  background: linear-gradient(180deg, #4a5568 0%, #2d3748 100%);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.7rem;
  font-family: var(--font-mono);
  margin-bottom: 0;
}

.plate {
  width: 180px;
  height: 40px;
  background: linear-gradient(
    135deg,
    var(--primary) 0%,
    var(--primary-dim) 100%
  );
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--bg-dark);
  margin-top: 5px;
  box-shadow:
    var(--glow-primary),
    0 4px 6px rgba(0, 0, 0, 0.3);
  animation: plateIn 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  position: relative;
  overflow: hidden;
}

.plate::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.3),
    transparent
  );
  animation: shine 2s infinite;
}

@keyframes shine {
  0% {
    left: -100%;
  }
  50%,
  100% {
    left: 100%;
  }
}

@keyframes plateIn {
  from {
    opacity: 0;
    transform: translateY(-50px) scale(0.8);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.plate.removing {
  animation: plateOut 0.4s forwards;
}

@keyframes plateOut {
  to {
    opacity: 0;
    transform: translateX(100px) rotate(15deg);
  }
}

.plate.peeking {
  animation: peekGlow 1s ease-in-out;
}

@keyframes peekGlow {
  0%,
  100% {
    box-shadow: var(--glow-primary);
  }
  50% {
    box-shadow:
      0 0 40px rgba(255, 217, 61, 0.8),
      0 0 60px rgba(255, 217, 61, 0.4);
  }
}

.plate.avalanche {
  animation: avalanche 0.6s forwards;
}

@keyframes avalanche {
  0% {
    transform: translateX(0) rotate(0);
  }
  25% {
    transform: translateX(-20px) rotate(-10deg);
  }
  50% {
    transform: translateX(20px) rotate(10deg);
  }
  75% {
    transform: translateX(-10px) rotate(-5deg);
  }
  100% {
    transform: translateY(200px) rotate(45deg);
    opacity: 0;
  }
}

/* Player Area */
.player-area {
  width: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
}

.player {
  text-align: center;
}

.player-body {
  font-size: 4rem;
  animation: playerIdle 2s ease-in-out infinite;
}

@keyframes playerIdle {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-5px);
  }
}

.player-health {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.health-bar {
  width: 100px;
  height: 12px;
  background: var(--bg-darker);
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.health-fill {
  height: 100%;
  background: linear-gradient(
    90deg,
    var(--danger),
    var(--warning),
    var(--success)
  );
  width: 100%;
  transition: width 0.5s ease;
}

/* Controls Panel */
.controls-panel {
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 1.5rem;
}

.input-group {
  margin-bottom: 1rem;
}

.input-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.input-group input,
.input-group select {
  width: 100%;
  max-width: 400px;
  padding: 0.75rem 1rem;
  background: var(--bg-darker);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 1rem;
  transition: all 0.3s;
}

.input-group input:focus,
.input-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 10px rgba(0, 245, 212, 0.2);
}

.input-group.dual {
  display: flex;
  gap: 1rem;
}

.input-group.dual > div {
  flex: 1;
}

.button-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  border: none;
  border-radius: 8px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

.btn-push {
  background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
  color: white;
}

.btn-push:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(16, 185, 129, 0.4);
}

.btn-pop {
  background: linear-gradient(135deg, var(--secondary) 0%, #dc2626 100%);
  color: white;
}

.btn-pop:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(255, 107, 107, 0.4);
}

.btn-peek {
  background: linear-gradient(135deg, var(--accent) 0%, #d97706 100%);
  color: var(--bg-dark);
}

.btn-peek:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(255, 217, 61, 0.4);
}

.btn-size {
  background: linear-gradient(135deg, var(--accent-blue) 0%, #4c1d95 100%);
  color: white;
}

.btn-size:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(108, 92, 231, 0.4);
}

.btn-reset {
  background: linear-gradient(135deg, #6b7280 0%, #374151 100%);
  color: white;
}

.btn-reset:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(107, 114, 128, 0.4);
}

.btn-start {
  background: linear-gradient(
    135deg,
    var(--primary) 0%,
    var(--primary-dim) 100%
  );
  color: var(--bg-dark);
}

.btn-start:hover {
  transform: translateY(-2px);
  box-shadow: var(--glow-primary);
}

.btn-step {
  background: linear-gradient(135deg, var(--purple) 0%, #7c3aed 100%);
  color: white;
}

.btn-step:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(168, 85, 247, 0.4);
}

.btn-auto {
  background: linear-gradient(135deg, var(--pink) 0%, #be185d 100%);
  color: white;
}

.btn-auto:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(236, 72, 153, 0.4);
}

/* Output Display */
.output-display {
  background: var(--bg-darker);
  border-radius: 8px;
  padding: 1rem;
  border-left: 3px solid var(--primary);
  font-family: var(--font-mono);
}

.output-label {
  color: var(--primary);
  font-weight: 700;
  margin-right: 0.5rem;
}

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

/* ============================================
   GAME 2: Node Tower Builder (Linked List)
   ============================================ */
.linked-list-area {
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 2rem;
  min-height: 300px;
  display: flex;
  align-items: center;
  gap: 0;
  overflow-x: auto;
  flex-direction: row-reverse;
  justify-content: flex-end;
}

.null-pointer {
  padding: 0.75rem 1.5rem;
  background: var(--bg-darker);
  border: 2px dashed var(--text-muted);
  border-radius: 8px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-weight: 700;
}

.linked-node {
  display: flex;
  align-items: center;
  animation: nodeIn 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes nodeIn {
  from {
    opacity: 0;
    transform: translateY(-30px) scale(0.8);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.node-box {
  display: flex;
  background: linear-gradient(
    135deg,
    var(--purple) 0%,
    var(--accent-blue) 100%
  );
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 0 20px rgba(168, 85, 247, 0.3);
}

.node-data {
  padding: 1rem 1.25rem;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.25rem;
  color: white;
  border-right: 2px solid rgba(255, 255, 255, 0.2);
}

.node-next {
  padding: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.8rem;
}

.node-arrow {
  width: 60px;
  height: 4px;
  background: var(--primary);
  position: relative;
  margin: 0 10px;
  animation: arrowGlow 1.5s ease-in-out infinite;
}

@keyframes arrowGlow {
  0%,
  100% {
    box-shadow: 0 0 5px var(--primary);
  }
  50% {
    box-shadow:
      0 0 20px var(--primary),
      0 0 30px var(--primary);
  }
}

.node-arrow::after {
  content: '';
  position: absolute;
  right: -8px;
  top: 50%;
  transform: translateY(-50%);
  border: 8px solid transparent;
  border-left-color: var(--primary);
}

.head-label {
  position: absolute;
  top: -25px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  font-weight: 700;
  padding: 2px 8px;
  background: var(--bg-darker);
  border-radius: 4px;
}

.linked-node:first-child .node-box {
  position: relative;
}

.linked-node:first-child .node-box::before {
  content: 'HEAD';
  position: absolute;
  top: -25px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  font-weight: 700;
  padding: 2px 8px;
  background: var(--bg-darker);
  border-radius: 4px;
}

.linked-node.removing {
  animation: nodeOut 0.5s forwards;
}

@keyframes nodeOut {
  to {
    opacity: 0;
    transform: translateY(-50px) scale(0.5);
  }
}

/* ============================================
   GAME 3: Duplicate Destroyer
   ============================================ */
.duplicate-game-area {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.input-string-display {
  display: flex;
  gap: 0.5rem;
  padding: 1.5rem;
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border);
  flex-wrap: wrap;
  min-height: 80px;
  align-items: center;
}

.char-block {
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(
    135deg,
    var(--accent-blue) 0%,
    var(--purple) 100%
  );
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: white;
  transition: all 0.3s;
}

.char-block.current {
  transform: scale(1.1);
  box-shadow: 0 0 20px var(--accent);
  background: linear-gradient(135deg, var(--accent) 0%, var(--warning) 100%);
  color: var(--bg-dark);
}

.char-block.processed {
  opacity: 0.5;
}

.char-block.exploding {
  animation: explode 0.5s forwards;
}

@keyframes explode {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.5);
    background: var(--secondary);
  }
  100% {
    transform: scale(0);
    opacity: 0;
  }
}

.stack-process-area {
  display: flex;
  gap: 2rem;
}

.process-stack,
.result-area {
  flex: 1;
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 1.5rem;
  min-height: 200px;
}

.stack-label,
.result-label {
  font-family: var(--font-display);
  font-size: 0.9rem;
  color: var(--primary);
  margin-bottom: 1rem;
  text-align: center;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.stack-items {
  display: flex;
  flex-direction: column-reverse;
  gap: 0.5rem;
  align-items: center;
}

.stack-item {
  width: 60px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(
    135deg,
    var(--primary) 0%,
    var(--primary-dim) 100%
  );
  border-radius: 6px;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--bg-dark);
  animation: stackItemIn 0.3s ease;
}

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

.result-items {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.result-item {
  width: 45px;
  height: 45px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-weight: 700;
  color: white;
  animation: resultIn 0.3s ease;
}

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

/* ============================================
   GAME 4 & 5: Expression Conversion
   ============================================ */
.conversion-area {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.expression-display {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.expr-box {
  flex: 1;
  min-width: 200px;
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 1.25rem;
}

.expr-box label {
  display: block;
  font-family: var(--font-display);
  font-size: 0.8rem;
  color: var(--primary);
  margin-bottom: 0.75rem;
}

.expr-content {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  min-height: 50px;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex-wrap: wrap;
}

.expr-char {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 35px;
  height: 35px;
  background: var(--bg-darker);
  border-radius: 6px;
  transition: all 0.3s;
}

.expr-char.operand {
  background: linear-gradient(
    135deg,
    var(--accent-blue) 0%,
    var(--purple) 100%
  );
  color: white;
}

.expr-char.operator {
  background: linear-gradient(135deg, var(--accent) 0%, var(--warning) 100%);
  color: var(--bg-dark);
}

.expr-char.paren {
  background: linear-gradient(135deg, var(--pink) 0%, var(--secondary) 100%);
  color: white;
}

.expr-char.current {
  transform: scale(1.2);
  box-shadow: 0 0 15px var(--primary);
}

.arrow-indicator {
  font-size: 2rem;
  color: var(--primary);
  animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 0.5;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.1);
  }
}

.operator-stack-area {
  display: flex;
  gap: 2rem;
}

.op-stack {
  flex: 1;
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 1.25rem;
  min-height: 150px;
}

.precedence-table {
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 1.25rem;
}

.precedence-table h4 {
  font-family: var(--font-display);
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.precedence-table table {
  width: 100%;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.precedence-table td {
  padding: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.precedence-table td:first-child {
  color: var(--accent);
  font-weight: 700;
}

/* Game 5: Conversion Steps */
.conversion-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}

.step-box {
  background: var(--bg-card);
  border-radius: 10px;
  border: 1px solid var(--border);
  padding: 1rem;
  transition: all 0.3s;
}

.step-box.active {
  border-color: var(--primary);
  box-shadow: var(--glow-primary);
}

.step-box.final {
  background: linear-gradient(
    135deg,
    rgba(0, 245, 212, 0.1) 0%,
    rgba(168, 85, 247, 0.1) 100%
  );
}

.step-box label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.step-content {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  min-height: 30px;
  word-break: break-all;
}

/* ============================================
   GAME 6: Reverse Polish Arena
   ============================================ */
.rpn-arena {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.token-queue {
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 1.5rem;
  min-height: 100px;
}

.queue-label {
  font-family: var(--font-display);
  font-size: 0.9rem;
  color: var(--accent);
  margin-bottom: 1rem;
}

.token-items {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.token-item {
  min-width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 1rem;
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  transition: all 0.3s;
}

.token-item.number {
  background: linear-gradient(
    135deg,
    var(--accent-blue) 0%,
    var(--purple) 100%
  );
  color: white;
}

.token-item.operator {
  background: linear-gradient(135deg, var(--secondary) 0%, var(--pink) 100%);
  color: white;
}

.token-item.current {
  transform: scale(1.15);
  box-shadow: 0 0 20px var(--accent);
}

.token-item.processed {
  opacity: 0.4;
}

.eval-stack-area {
  display: flex;
  gap: 2rem;
}

.eval-stack {
  flex: 1;
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 1.5rem;
  min-height: 200px;
}

.battle-result {
  width: 200px;
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.enemy {
  font-size: 4rem;
  animation: enemyBounce 1s ease-in-out infinite;
}

@keyframes enemyBounce {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

.vs {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--secondary);
  text-shadow: var(--glow-secondary);
}

.damage {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--primary);
  text-shadow: var(--glow-primary);
}

.damage.hit {
  animation: hitDamage 0.5s ease;
  color: var(--success);
}

@keyframes hitDamage {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.5);
  }
  100% {
    transform: scale(1);
  }
}

/* ============================================
   GAME 7: Expression Forest (Tree)
   ============================================ */
.tree-builder-area {
  display: flex;
  gap: 2rem;
  min-height: 400px;
}

.tree-canvas {
  flex: 2;
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

#tree-svg-7 {
  width: 100%;
  height: 100%;
}

.tree-node {
  cursor: pointer;
  transition: all 0.3s;
}

.tree-node circle {
  fill: var(--accent-blue);
  stroke: var(--primary);
  stroke-width: 2;
  transition: all 0.3s;
}

.tree-node.operator circle {
  fill: var(--accent);
}

.tree-node.active circle {
  fill: var(--primary);
  filter: drop-shadow(0 0 10px var(--primary));
}

.tree-node text {
  fill: white;
  font-family: var(--font-mono);
  font-weight: 700;
  text-anchor: middle;
  dominant-baseline: central;
}

.tree-edge {
  stroke: var(--text-muted);
  stroke-width: 2;
  fill: none;
}

.tree-edge.active {
  stroke: var(--primary);
  animation: edgeGlow 1s ease-in-out infinite;
}

@keyframes edgeGlow {
  0%,
  100% {
    stroke-opacity: 0.5;
  }
  50% {
    stroke-opacity: 1;
  }
}

.tree-stack {
  flex: 1;
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 1.25rem;
  min-width: 150px;
}

.tree-stack-item {
  padding: 0.5rem 1rem;
  background: linear-gradient(
    135deg,
    var(--purple) 0%,
    var(--accent-blue) 100%
  );
  border-radius: 6px;
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
  text-align: center;
  color: white;
  font-weight: 600;
  animation: stackItemIn 0.3s ease;
}

/* ============================================
   GAME 8, 9, 10: Bar/Histogram Games
   ============================================ */
.histogram-area {
  display: flex;
  gap: 2rem;
  min-height: 350px;
}

.bars-container {
  flex: 2;
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 1.5rem;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 10px;
  min-height: 300px;
}

.bar {
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: all 0.3s;
}

.bar-fill {
  width: 50px;
  background: linear-gradient(
    180deg,
    var(--accent-blue) 0%,
    var(--purple) 100%
  );
  border-radius: 6px 6px 0 0;
  transition: all 0.3s;
  position: relative;
}

.bar-value {
  position: absolute;
  top: -25px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--text-primary);
}

.bar-index {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.bar.current .bar-fill {
  background: linear-gradient(180deg, var(--accent) 0%, var(--warning) 100%);
  box-shadow: 0 0 20px rgba(255, 217, 61, 0.5);
}

.bar.found .bar-fill {
  background: linear-gradient(180deg, var(--success) 0%, #059669 100%);
  box-shadow: 0 0 20px rgba(16, 185, 129, 0.5);
}

.bar.comparing .bar-fill {
  background: linear-gradient(180deg, var(--pink) 0%, var(--secondary) 100%);
}

.nsl-stack {
  flex: 1;
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 1.25rem;
  min-width: 120px;
}

.result-table {
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 1rem;
  overflow-x: auto;
  margin-bottom: 1rem;
}

.result-table table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.result-table th,
.result-table td {
  padding: 0.75rem 1rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.result-table th {
  background: var(--bg-darker);
  color: var(--primary);
  font-weight: 700;
}

.result-table td {
  color: var(--text-secondary);
}

.result-table tr.active td {
  background: rgba(0, 245, 212, 0.1);
  color: var(--text-primary);
}

.result-table td.highlight {
  color: var(--success);
  font-weight: 700;
}

/* Giant Hunt specific */
.giant-hunt .bar.giant .bar-fill::after {
  content: '👹';
  position: absolute;
  top: -40px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 1.5rem;
  animation: giantAppear 0.5s ease;
}

@keyframes giantAppear {
  from {
    opacity: 0;
    transform: translateX(-50%) scale(0);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) scale(1);
  }
}

/* ============================================
   GAME 11: Rectangle Titan (Histogram)
   ============================================ */
.histogram-titan-area {
  display: flex;
  gap: 2rem;
  min-height: 400px;
}

.histogram-visual {
  flex: 2;
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 1.5rem;
  position: relative;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 4px;
}

.histogram-bar {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

.histogram-bar-fill {
  width: 45px;
  background: linear-gradient(
    180deg,
    var(--accent-blue) 0%,
    var(--purple) 100%
  );
  border-radius: 4px 4px 0 0;
  transition: all 0.3s;
  position: relative;
}

.histogram-bar.in-stack .histogram-bar-fill {
  background: linear-gradient(
    180deg,
    var(--primary) 0%,
    var(--primary-dim) 100%
  );
}

.histogram-bar.calculating .histogram-bar-fill {
  background: linear-gradient(180deg, var(--accent) 0%, var(--warning) 100%);
}

.histogram-bar-value {
  position: absolute;
  top: 5px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
  color: white;
}

.histogram-bar-index {
  margin-top: 5px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.max-rectangle {
  position: absolute;
  border: 3px solid var(--success);
  background: rgba(16, 185, 129, 0.2);
  pointer-events: none;
  animation: rectGlow 1s ease-in-out infinite;
}

@keyframes rectGlow {
  0%,
  100% {
    box-shadow: 0 0 10px var(--success);
  }
  50% {
    box-shadow:
      0 0 30px var(--success),
      0 0 50px var(--success);
  }
}

.titan-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-width: 200px;
}

.info-stack {
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 1rem;
  flex: 1;
}

.calculation-display {
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 1rem;
}

.calculation-display h4 {
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.calc-row {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border);
}

.calc-row span:first-child {
  color: var(--text-muted);
}

.calc-row span:last-child {
  color: var(--text-primary);
  font-weight: 700;
}

.calc-row.highlight {
  background: rgba(16, 185, 129, 0.1);
  margin: 0 -1rem;
  padding: 0.75rem 1rem;
  border-radius: 6px;
}

.calc-row.highlight span:last-child {
  color: var(--success);
  font-size: 1.1rem;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1200px) {
  .sidebar {
    width: 240px;
  }
  .game-container {
    margin-left: 240px;
  }
}

@media (max-width: 992px) {
  .sidebar {
    width: 200px;
  }
  .game-container {
    margin-left: 200px;
  }
  .game-area-wrapper {
    flex-direction: column;
  }
  .player-area {
    width: 100%;
    flex-direction: row;
    justify-content: center;
  }
}

@media (max-width: 768px) {
  .sidebar {
    width: 100%;
    position: relative;
    height: auto;
  }
  .game-container {
    margin-left: 0;
  }
  .app-container {
    flex-direction: column;
  }
  .game-list {
    display: flex;
    flex-wrap: wrap;
    padding: 0.5rem;
  }
  .game-item {
    flex: 1 1 calc(50% - 0.5rem);
    padding: 0.5rem;
  }
  .histogram-area,
  .histogram-titan-area,
  .tree-builder-area {
    flex-direction: column;
  }
  .bars-container,
  .histogram-visual,
  .tree-canvas {
    min-height: 250px;
  }
}

/* ============================================
   Utility Classes
   ============================================ */
.hidden {
  display: none !important;
}

.glow-text {
  text-shadow: var(--glow-primary);
}

.shake {
  animation: shake 0.5s ease-in-out;
}

@keyframes shake {
  0%,
  100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-10px);
  }
  75% {
    transform: translateX(10px);
  }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-darker);
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}