/* =====================================================
   QUEUE WORLDS - Main Stylesheet
   A mystical adventure through data structures
   ===================================================== */

/* CSS Variables - Theme */
:root {
  /* Primary Colors */
  --color-bg-dark: #0a0a1a;
  --color-bg-medium: #12122a;
  --color-bg-light: #1a1a3a;

  /* Accent Colors */
  --color-fifo: #00d4ff;
  --color-fifo-glow: rgba(0, 212, 255, 0.5);
  --color-deque: #ff00ff;
  --color-deque-glow: rgba(255, 0, 255, 0.5);
  --color-success: #00ff88;
  --color-error: #ff4466;
  --color-warning: #ffaa00;
  --color-gold: #ffd700;

  /* Realm Colors */
  --realm1-color: #4ecdc4;
  --realm2-color: #45b7d1;
  --realm3-color: #96ceb4;
  --realm4-color: #8b7355;
  --realm5-color: #e74c3c;
  --realm6-color: #f1c40f;
  --realm7-color: #9b59b6;
  --realm8-color: #2ecc71;
  --realm9-color: #e91e63;
  --realm10-color: #673ab7;

  /* Text Colors */
  --text-primary: #ffffff;
  --text-secondary: #aaaacc;
  --text-muted: #666688;

  /* Fonts */
  --font-title: 'Cinzel Decorative', serif;
  --font-display: 'Orbitron', sans-serif;
  --font-body: 'Rajdhani', sans-serif;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;

  /* Borders */
  --border-radius: 8px;
  --border-radius-lg: 16px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html,
body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: var(--font-body);
  background: var(--color-bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
}

/* Particle Background Canvas */
#particles-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* Game Container */
#game-container {
  position: relative;
  width: 100%;
  height: 100vh;
  z-index: 1;
  overflow: hidden;
}

/* Screen Management */
.screen {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: none;
  flex-direction: column;
  opacity: 0;
  transition: opacity var(--transition-slow);
}

.screen.active {
  display: flex;
  opacity: 1;
}

/* =====================================================
   TITLE SCREEN
   ===================================================== */

#title-screen {
  background: radial-gradient(
    ellipse at center,
    var(--color-bg-medium) 0%,
    var(--color-bg-dark) 100%
  );
  justify-content: center;
  align-items: center;
}

.title-content {
  text-align: center;
  max-width: 800px;
  padding: var(--spacing-xl);
}

.logo-container {
  position: relative;
  margin-bottom: var(--spacing-xl);
}

.magic-circle {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 300px;
  height: 300px;
  border: 2px solid var(--color-fifo);
  border-radius: 50%;
  opacity: 0.3;
  animation: rotate-slow 20s linear infinite;
}

.magic-circle::before {
  content: '';
  position: absolute;
  top: 10%;
  left: 10%;
  right: 10%;
  bottom: 10%;
  border: 1px solid var(--color-deque);
  border-radius: 50%;
  animation: rotate-slow 15s linear infinite reverse;
}

@keyframes rotate-slow {
  from {
    transform: translate(-50%, -50%) rotate(0deg);
  }
  to {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}

.game-title {
  font-family: var(--font-title);
  font-size: 4rem;
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: var(--spacing-md);
  text-shadow: 0 0 30px var(--color-fifo-glow);
}

.title-queue {
  display: block;
  background: linear-gradient(135deg, var(--color-fifo), var(--color-deque));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: title-glow 3s ease-in-out infinite;
}

.title-worlds {
  display: block;
  font-size: 5rem;
  color: var(--text-primary);
  letter-spacing: 0.3em;
}

@keyframes title-glow {
  0%,
  100% {
    filter: brightness(1);
  }
  50% {
    filter: brightness(1.3);
  }
}

.game-subtitle {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: var(--spacing-xl);
}

.lore-text {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  line-height: 2;
}

.lore-text .highlight {
  color: var(--color-gold);
  font-weight: 600;
}

.lore-text .highlight-fifo {
  color: var(--color-fifo);
  font-weight: 600;
}

.lore-text .highlight-deque {
  color: var(--color-deque);
  font-weight: 600;
}

/* Menu Buttons */
.menu-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.btn-primary,
.btn-secondary {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  padding: var(--spacing-md) var(--spacing-xl);
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-fifo), var(--color-deque));
  color: white;
  box-shadow: 0 4px 20px var(--color-fifo-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px var(--color-fifo-glow);
}

.btn-glow {
  animation: btn-pulse 2s ease-in-out infinite;
}

@keyframes btn-pulse {
  0%,
  100% {
    box-shadow: 0 4px 20px var(--color-fifo-glow);
  }
  50% {
    box-shadow: 0 4px 40px var(--color-deque-glow);
  }
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--color-fifo);
}

.btn-secondary:hover {
  background: var(--color-fifo);
  color: var(--color-bg-dark);
  transform: translateY(-2px);
}

.btn-icon {
  font-size: 1.2rem;
}

.btn-back {
  background: transparent;
  border: 1px solid var(--text-muted);
  color: var(--text-secondary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.btn-back:hover {
  border-color: var(--color-fifo);
  color: var(--color-fifo);
}

/* Performance Info */
.performance-info {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xl);
}

.info-card {
  background: var(--color-bg-light);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--border-radius);
  border: 1px solid var(--color-fifo);
}

.info-card .label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.info-card .value {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--color-fifo);
}

/* =====================================================
   REALM SELECT SCREEN
   ===================================================== */

#realm-select-screen {
  background: var(--color-bg-dark);
  padding: var(--spacing-xl);
}

.screen-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-bg-light);
  margin-bottom: var(--spacing-xl);
}

.screen-header h2 {
  font-family: var(--font-title);
  font-size: 2rem;
  color: var(--text-primary);
}

.player-stats {
  display: flex;
  gap: var(--spacing-lg);
}

.player-stats .stat {
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--color-gold);
}

/* Realm Grid */
.realm-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  overflow-y: auto;
  padding: var(--spacing-md);
  flex: 1;
}

.realm-card {
  background: var(--color-bg-medium);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.realm-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--realm1-color);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.realm-card:nth-child(1)::before {
  background: var(--realm1-color);
}
.realm-card:nth-child(2)::before {
  background: var(--realm2-color);
}
.realm-card:nth-child(3)::before {
  background: var(--realm3-color);
}
.realm-card:nth-child(4)::before {
  background: var(--realm4-color);
}
.realm-card:nth-child(5)::before {
  background: var(--realm5-color);
}
.realm-card:nth-child(6)::before {
  background: var(--realm6-color);
}
.realm-card:nth-child(7)::before {
  background: var(--realm7-color);
}
.realm-card:nth-child(8)::before {
  background: var(--realm8-color);
}
.realm-card:nth-child(9)::before {
  background: var(--realm9-color);
}
.realm-card:nth-child(10)::before {
  background: var(--realm10-color);
}

.realm-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-fifo);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

.realm-card:hover::before {
  opacity: 1;
}

.realm-card.boss-realm {
  border: 2px solid var(--color-error);
  animation: boss-pulse 2s ease-in-out infinite;
}

@keyframes boss-pulse {
  0%,
  100% {
    box-shadow: 0 0 20px rgba(233, 30, 99, 0.3);
  }
  50% {
    box-shadow: 0 0 40px rgba(233, 30, 99, 0.6);
  }
}

.realm-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

.realm-card h3 {
  font-family: var(--font-title);
  font-size: 1.3rem;
  margin-bottom: var(--spacing-xs);
}

.realm-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: var(--spacing-md);
}

.realm-difficulty {
  margin-bottom: var(--spacing-sm);
}

.realm-difficulty .star {
  color: var(--text-muted);
  font-size: 1.2rem;
}

.realm-difficulty .star.active {
  color: var(--color-gold);
}

.realm-ops {
  font-family: var(--font-display);
  font-size: 0.75rem;
  color: var(--color-fifo);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: rgba(0, 212, 255, 0.1);
  border-radius: var(--border-radius);
  display: inline-block;
}

.realm-card.locked {
  opacity: 0.5;
  pointer-events: none;
}

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

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

#game-screen {
  background: var(--color-bg-dark);
  display: grid;
  grid-template-rows: auto 1fr auto;
  grid-template-columns: 1fr 300px;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
}

.game-header {
  grid-column: 1 / -1;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md);
  background: var(--color-bg-medium);
  border-radius: var(--border-radius);
}

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

.header-left h2 {
  font-family: var(--font-title);
  font-size: 1.5rem;
}

.quest-info {
  font-family: var(--font-display);
  font-size: 0.9rem;
  color: var(--color-gold);
}

.score-display {
  font-family: var(--font-display);
  font-size: 1.2rem;
}

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

#current-score {
  color: var(--color-success);
}

.btn-hint {
  background: var(--color-warning);
  color: var(--color-bg-dark);
  border: none;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  cursor: pointer;
  font-family: var(--font-body);
  font-weight: 600;
  transition: all var(--transition-fast);
}

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

/* Visualization Area */
#visualization-area {
  position: relative;
  background: var(--color-bg-medium);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

#game-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* Visualization Overlays */
.viz-overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 90%;
  max-width: 800px;
}

.viz-overlay.hidden {
  display: none;
}

.viz-header {
  display: flex;
  justify-content: space-between;
  padding: var(--spacing-sm);
}

.pointer {
  font-family: var(--font-display);
  font-size: 0.8rem;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
}

.front-pointer {
  background: var(--color-success);
  color: var(--color-bg-dark);
}

.back-pointer {
  background: var(--color-warning);
  color: var(--color-bg-dark);
}

.structure-container {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-xs);
  min-height: 80px;
  padding: var(--spacing-md);
  background: rgba(0, 0, 0, 0.3);
  border-radius: var(--border-radius);
  flex-wrap: wrap;
}

.viz-stats {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xl);
  padding: var(--spacing-md);
  font-family: var(--font-display);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Queue Elements */
.queue-element {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-fifo), #0088aa);
  border-radius: var(--border-radius);
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: white;
  position: relative;
  transition: all var(--transition-normal);
}

.queue-element.front {
  border: 3px solid var(--color-success);
  box-shadow: 0 0 20px var(--color-success);
}

.queue-element.back {
  border: 3px solid var(--color-warning);
  box-shadow: 0 0 20px var(--color-warning);
}

.queue-element.highlight {
  animation: element-highlight 0.5s ease;
}

@keyframes element-highlight {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.2);
  }
}

/* Stack Elements */
.stack-element {
  width: 80px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-deque), #aa00aa);
  border-radius: var(--border-radius);
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: white;
}

/* Algorithm Panel */
.algo-panel {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  width: 250px;
  background: rgba(10, 10, 26, 0.9);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  border: 1px solid var(--color-fifo);
}

.algo-panel h4 {
  font-family: var(--font-title);
  font-size: 1rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-fifo);
}

#algo-steps {
  font-size: 0.85rem;
  line-height: 1.8;
}

.algo-step {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-xs);
  transition: all var(--transition-fast);
}

.algo-step.active {
  background: var(--color-fifo);
  color: var(--color-bg-dark);
}

.algo-step.completed {
  color: var(--color-success);
}

.pseudocode {
  font-family: 'Courier New', monospace;
  font-size: 0.75rem;
  background: var(--color-bg-dark);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  margin-top: var(--spacing-md);
  overflow-x: auto;
  white-space: pre;
  color: var(--text-secondary);
}

.pseudocode .highlight-line {
  background: rgba(0, 212, 255, 0.3);
  display: block;
}

/* Control Panel */
#control-panel {
  grid-column: 1;
  background: var(--color-bg-medium);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  align-items: center;
}

.input-section {
  display: flex;
  gap: var(--spacing-sm);
}

.input-section input {
  background: var(--color-bg-dark);
  border: 2px solid var(--color-bg-light);
  color: var(--text-primary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  font-family: var(--font-body);
  font-size: 1rem;
  width: 150px;
  transition: border-color var(--transition-fast);
}

.input-section input:focus {
  outline: none;
  border-color: var(--color-fifo);
}

.input-section input.hidden {
  display: none;
}

.action-buttons {
  display: flex;
  gap: var(--spacing-sm);
}

.btn-action {
  background: var(--color-bg-light);
  border: 2px solid var(--color-fifo);
  color: var(--color-fifo);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--border-radius);
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.btn-action:hover {
  background: var(--color-fifo);
  color: var(--color-bg-dark);
}

.btn-action .btn-text {
  font-weight: 600;
}

.btn-action .btn-key {
  font-size: 0.7rem;
  opacity: 0.7;
}

.btn-enqueue {
  border-color: var(--color-success);
  color: var(--color-success);
}
.btn-enqueue:hover {
  background: var(--color-success);
}

.btn-dequeue {
  border-color: var(--color-error);
  color: var(--color-error);
}
.btn-dequeue:hover {
  background: var(--color-error);
}

.btn-peek {
  border-color: var(--color-warning);
  color: var(--color-warning);
}
.btn-peek:hover {
  background: var(--color-warning);
}

#special-actions {
  display: flex;
  gap: var(--spacing-sm);
}

.speed-control {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-left: auto;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.speed-control input[type='range'] {
  width: 100px;
  accent-color: var(--color-fifo);
}

/* Quest Panel */
#quest-panel {
  grid-row: 2 / 4;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.quest-card,
.complexity-card {
  background: var(--color-bg-medium);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
}

.quest-card h4,
.complexity-card h4 {
  font-family: var(--font-title);
  font-size: 1rem;
  color: var(--color-gold);
  margin-bottom: var(--spacing-md);
}

#quest-description {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.quest-progress {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.progress-bar {
  flex: 1;
  height: 8px;
  background: var(--color-bg-dark);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-fifo), var(--color-success));
  width: 0%;
  transition: width var(--transition-normal);
}

.complexity-row {
  display: flex;
  justify-content: space-between;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-bg-light);
}

.complexity-row:last-child {
  border-bottom: none;
}

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

.complexity-value {
  font-family: var(--font-display);
  color: var(--color-fifo);
}

/* Message Box */
.message-box {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.message-box.hidden {
  display: none;
}

.message-content {
  background: var(--color-bg-medium);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  text-align: center;
  max-width: 400px;
  border: 2px solid var(--color-fifo);
}

.message-content h3 {
  font-family: var(--font-title);
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
}

.message-content p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

.message-content button {
  background: var(--color-fifo);
  color: var(--color-bg-dark);
  border: none;
  padding: var(--spacing-sm) var(--spacing-xl);
  border-radius: var(--border-radius);
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 600;
}

/* Loading Overlay */
.loading {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.loading.hidden {
  display: none;
}

.loader {
  text-align: center;
}

.queue-loader {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.loader-item {
  width: 20px;
  height: 20px;
  background: var(--color-fifo);
  border-radius: 4px;
  animation: loader-pulse 1.5s ease-in-out infinite;
}

.loader-item:nth-child(1) {
  animation-delay: 0s;
}
.loader-item:nth-child(2) {
  animation-delay: 0.2s;
}
.loader-item:nth-child(3) {
  animation-delay: 0.4s;
}
.loader-item:nth-child(4) {
  animation-delay: 0.6s;
}

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

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

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

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

::-webkit-scrollbar-thumb:hover {
  background: var(--color-fifo);
}