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

:root {
  --bg-primary: #0f0f0f;
  --bg-secondary: #1a1a1a;
  --bg-tertiary: #242424;
  --surface: #2a2a2a;
  --surface-hover: #333333;
  --surface-active: #3d3d3d;
  
  --text-primary: #ffffff;
  --text-secondary: #b4b4b4;
  --text-muted: #808080;
  --text-disabled: #4a4a4a;
  
  --accent-primary: #00f5ff;
  --accent-secondary: #ff006e;
  --accent-success: #00ff88;
  --accent-warning: #ffb347;
  --accent-error: #ff4757;
  
  --gradient-primary: linear-gradient(135deg, #00f5ff 0%, #0099ff 100%);
  --gradient-secondary: linear-gradient(135deg, #ff006e 0%, #8f00ff 100%);
  --gradient-success: linear-gradient(135deg, #00ff88 0%, #00cc6a 100%);
  --gradient-surface: linear-gradient(135deg, #2a2a2a 0%, #1f1f1f 100%);
  
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.8);
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.6);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 12px 24px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 20px rgba(0, 245, 255, 0.3);
  
  --border-radius-sm: 8px;
  --border-radius-md: 12px;
  --border-radius-lg: 16px;
  --border-radius-xl: 20px;
  
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::-webkit-scrollbar {
  width: 8px;
}

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

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

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

.navbar {
  background: rgba(15, 15, 15, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--surface);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: var(--space-sm) 0;
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.brand-icon {
  font-size: 1.5rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.brand-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--surface);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--surface-hover);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-success);
  animation: pulse 2s infinite;
}

.status-text {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  font-weight: var(--font-weight-medium);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.app {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-md) var(--space-md);
  display: grid;
  grid-template-columns: 280px 1fr 250px;
  gap: var(--space-md);
  height: calc(100vh - 80px);
  overflow: hidden;
}

.control-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  overflow-y: auto;
}

.control-section {
  background: var(--gradient-surface);
  border: 1px solid var(--surface-hover);
  border-radius: var(--border-radius-md);
  padding: var(--space-md);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(10px);
}

.section-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.section-title i {
  color: var(--accent-primary);
  font-size: 1.2em;
}

.control-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.control-item {
  display: flex;
          flex-direction: column;
  gap: var(--space-sm);
}

.control-label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
}

.control-label i {
  color: var(--accent-primary);
  width: 16px;
}

.slider-container {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.slider {
  flex: 1;
  height: 6px;
  border-radius: 3px;
  background: var(--bg-secondary);
  outline: none;
  -webkit-appearance: none;
  position: relative;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--gradient-primary);
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: var(--transition-fast);
}

.slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: var(--shadow-glow);
}

.slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--gradient-primary);
  cursor: pointer;
  border: none;
  box-shadow: var(--shadow-md);
}

.slider-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--accent-primary);
  background: var(--bg-secondary);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--border-radius-sm);
  min-width: 40px;
  text-align: center;
}

.generate-btn {
  width: 100%;
  background: var(--gradient-primary);
  border: none;
  color: var(--bg-primary);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  position: relative;
  overflow: hidden;
}

.generate-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
  filter: brightness(1.1);
}

.generate-btn:active {
  transform: translateY(0);
}

.generate-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s;
}

.generate-btn:hover::before {
  left: 100%;
}

.algorithm-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.algorithm-btn {
  background: var(--surface);
  border: 1px solid var(--surface-hover);
  border-radius: var(--border-radius-sm);
  padding: var(--space-sm);
  cursor: pointer;
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
  font-family: 'Inter', sans-serif;
  font-size: var(--font-size-sm);
  color: var(--text-primary);
}

.algorithm-btn:hover {
  background: var(--surface-hover);
  border-color: var(--accent-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.algorithm-btn.butt_selected {
  background: var(--gradient-primary);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-glow);
}

.algorithm-btn.butt_selected .algo-info {
  color: var(--bg-primary);
}

.algorithm-btn.butt_locked {
  opacity: 0.5;
  cursor: not-allowed;
  filter: grayscale(1);
  background: var(--surface) !important;
  border-color: var(--surface-hover) !important;
  color: var(--text-muted) !important;
}

.algorithm-btn.butt_locked:hover {
  transform: none !important;
  background: var(--surface) !important;
  border-color: var(--surface-hover) !important;
  box-shadow: none !important;
}

.algorithm-btn.butt_locked .algo-info {
  color: var(--text-muted) !important;
}

.algorithm-btn.butt_locked .algo-complexity {
  background: var(--bg-secondary) !important;
  color: var(--text-disabled) !important;
}

.algo-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-primary);
}

.algo-name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

.algo-complexity {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  font-weight: var(--font-weight-semibold);
  background: var(--bg-secondary);
  padding: 1px var(--space-xs);
  border-radius: 3px;
  color: var(--accent-primary);
}

.algorithm-btn.butt_selected .algo-complexity {
  background: rgba(15, 15, 15, 0.3);
  color: var(--bg-primary);
}

.visualization-section {
  display: flex;
  flex-direction: column;
  background: var(--gradient-surface);
  border: 1px solid var(--surface-hover);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  height: 100%;
}

.visualization-header {
  padding: var(--space-md);
  border-bottom: 1px solid var(--surface-hover);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.viz-title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
}

.viz-controls {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.progress-container {
  width: 200px;
  height: 4px;
  background: var(--bg-secondary);
  border-radius: 2px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 2px;
  width: 0%;
  transition: width 0.3s ease;
}

.legend {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
}

.legend-color {
  width: 12px;
  height: 12px;
  border-radius: 2px;
}

.legend-color.comparing {
  background: var(--accent-warning);
}

.legend-color.swapping {
  background: var(--accent-secondary);
}

.legend-color.sorted {
  background: var(--accent-success);
}

.visualization-container {
  flex: 1;
  padding: var(--space-md) var(--space-sm);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  min-height: 300px;
  max-height: 400px;
  position: relative;
  overflow: visible;
  background: 
    radial-gradient(circle at 20% 20%, rgba(0, 245, 255, 0.05) 0%, transparent 40%),
    radial-gradient(circle at 80% 80%, rgba(255, 0, 110, 0.05) 0%, transparent 40%);
}

.array-container {
  display: flex;
  align-items: flex-end;
  justify-content: space-evenly;
  width: 100%;
  height: 100%;
  overflow: visible;
  padding: 0 var(--space-sm);
  box-sizing: border-box;
}

/* Info Panel */
.info-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.info-card {
  background: var(--gradient-surface);
  border: 1px solid var(--surface-hover);
  border-radius: var(--border-radius-xl);
  padding: var(--space-lg);
  box-shadow: var(--shadow-lg);
}

.card-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
}

.card-title i {
  color: var(--accent-primary);
}

.complexity-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.complexity-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--surface-hover);
}

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

.complexity-case {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  font-weight: var(--font-weight-medium);
}

.complexity-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--accent-primary);
  background: var(--bg-secondary);
  padding: 2px var(--space-sm);
  border-radius: var(--border-radius-sm);
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  padding: var(--space-sm);
  background: var(--bg-secondary);
  border-radius: var(--border-radius-sm);
  text-align: center;
}

.stat-label {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  font-weight: var(--font-weight-medium);
}

.stat-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--accent-primary);
}

.array-bar {
  background: var(--gradient-primary);
  border-radius: 2px 2px 0 0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
  flex-shrink: 0;
  min-height: 5px;
  min-width: 1px;
  overflow: hidden;
  align-self: flex-end;
}

.array-bar.comparing {
  background: var(--gradient-secondary);
  box-shadow: 0 0 15px rgba(255, 0, 110, 0.5);
  transform: scale(1.05);
}

.array-bar.swapping {
  background: linear-gradient(135deg, var(--accent-warning) 0%, #ff8c00 100%);
  box-shadow: 0 0 15px rgba(255, 179, 71, 0.5);
  transform: scale(1.1);
}

.array-bar.sorted {
  background: var(--gradient-success);
  box-shadow: 0 0 10px rgba(0, 255, 136, 0.3);
}

@media (max-width: 1200px) {
  .app {
    grid-template-columns: 320px 1fr 280px;
    gap: var(--space-lg);
  }
}

@media (max-width: 1024px) {
  .app {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  
  .control-panel {
    order: 1;
  }
  
  .visualization-section {
    order: 2;
  }
  
  .info-panel {
    order: 3;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    display: grid;
  }
  
  .algorithm-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .viz-controls {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-md);
  }
  
  .legend {
    justify-content: center;
  }
}

@media (max-width: 768px) {
  .app {
    padding: var(--space-lg);
  }
  
  .nav-container {
    padding: 0 var(--space-md);
  }
  
  .brand-title {
    font-size: var(--font-size-xl);
  }
  
  .algorithm-grid {
    grid-template-columns: 1fr;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .control-grid {
    gap: var(--space-md);
  }
  
  .visualization-header {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (max-width: 480px) {
  .app {
    padding: var(--space-md);
  }
  
  .control-section {
    padding: var(--space-lg);
  }
  
  .info-card {
    padding: var(--space-md);
  }
  
  .nav-brand {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }
  
  .brand-title {
    font-size: var(--font-size-lg);
  }
}

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

.slide-up {
  animation: slideUp 0.5s ease-out;
}

.bounce-in {
  animation: bounceIn 0.6s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

@keyframes bounceIn {
  0% {
    opacity: 0;
    transform: scale(0.3);
  }
  50% {
    opacity: 1;
    transform: scale(1.05);
  }
  70% {
    transform: scale(0.9);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

.hide {
  display: none !important;
}

.disabled {
  pointer-events: none;
  opacity: 0.5;
}

.glow {
  box-shadow: var(--shadow-glow);
}

body.loading {
  overflow: hidden;
}

body.loading .app {
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition-slow);
}

body.loading .navbar {
  opacity: 0;
  transform: translateY(-20px);
  transition: var(--transition-slow);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--surface);
  border-top: 4px solid var(--accent-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 20px auto;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@media (prefers-contrast: high) {
  :root {
    --bg-primary: #000000;
    --text-primary: #ffffff;
    --accent-primary: #00ffff;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  .navbar,
  .control-panel,
  .info-panel {
    display: none;
  }
  
  .app {
    grid-template-columns: 1fr;
  }
  
  .visualization-section {
    box-shadow: none;
    border: 1px solid #000;
  }
}