/* ============================================
   ALGOPHI - Algorithm Visualizer
   Dark terminal aesthetic with neon accents
   By Debarshi Das - debarshidas.dev
   ============================================ */

:root {
  /* Core palette */
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-elevated: #1a1a24;
  --bg-surface: #22222e;
  
  /* Bar state colors - CRITICAL for visualization */
  --bar-default: #4cc9f0;
  --bar-active: #fee440;
  --bar-comparing: #f72585;
  --bar-swapping: #ff6b35;
  --bar-sorted: #7ae582;
  
  /* UI accents */
  --accent-cyan: #00f5d4;
  --accent-magenta: #f72585;
  --accent-yellow: #fee440;
  --accent-orange: #ff6b35;
  --accent-green: #7ae582;
  
  /* Text */
  --text-primary: #e8e8e8;
  --text-secondary: #888899;
  --text-muted: #555566;
  
  /* Borders & effects */
  --border-subtle: rgba(255, 255, 255, 0.06);
  --glow-cyan: 0 0 20px rgba(0, 245, 212, 0.4);
  --glow-magenta: 0 0 15px rgba(247, 37, 133, 0.5);
  --glow-yellow: 0 0 15px rgba(254, 228, 64, 0.5);
  --glow-orange: 0 0 15px rgba(255, 107, 53, 0.6);
  --glow-green: 0 0 15px rgba(122, 229, 130, 0.5);
  
  /* Typography */
  --font-mono: 'JetBrains Mono', monospace;
  --font-sans: 'Outfit', sans-serif;
  
  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: 14px;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Grid background pattern */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(0, 245, 212, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 245, 212, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
  z-index: 0;
}

/* ============================================
   MOBILE OVERLAY
   ============================================ */
.mobile-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-primary);
  z-index: 9999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-xl);
}

.mobile-overlay-content {
  max-width: 320px;
}

.mobile-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  color: var(--accent-cyan);
}

.mobile-icon svg {
  opacity: 0.8;
}

.rotate-arrow {
  animation: rotate-hint 2s ease-in-out infinite;
}

@keyframes rotate-hint {
  0%, 100% { transform: rotate(0deg); opacity: 0.5; }
  50% { transform: rotate(90deg); opacity: 1; }
}

.mobile-overlay h2 {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  color: var(--accent-cyan);
  margin-bottom: var(--space-md);
}

.mobile-overlay p {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================
   APP CONTAINER
   ============================================ */
.app-container {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ============================================
   HEADER
   ============================================ */
.header {
  padding: var(--space-lg) var(--space-xl);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
}

.logo-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
}

.logo {
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -2px;
  display: flex;
  align-items: center;
  gap: 2px;
  transition: var(--transition-base);
}

.logo:hover {
  transform: scale(1.02);
}

.logo-bracket {
  color: var(--accent-magenta);
  font-weight: 300;
}

.logo-text {
  color: var(--accent-cyan);
  text-shadow: var(--glow-cyan);
}

.tagline {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-muted);
  letter-spacing: 1px;
}

/* ============================================
   CONTROLS / NAVBAR
   ============================================ */
.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  padding: var(--space-md) var(--space-xl);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
}

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

.control-group--sliders {
  gap: var(--space-xl);
}

/* Buttons */
.btn {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid transparent;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

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

.btn--accent:hover:not(:disabled) {
  background: transparent;
  color: var(--accent-cyan);
  box-shadow: var(--glow-cyan);
}

.btn--reset {
  background: var(--bg-surface);
  color: var(--text-secondary);
  border-color: var(--border-subtle);
}

.btn--reset:hover:not(:disabled) {
  color: var(--accent-orange);
  border-color: var(--accent-orange);
}

.btn--pause {
  background: var(--accent-yellow);
  color: var(--bg-primary);
  border-color: var(--accent-yellow);
  font-weight: 600;
}

.btn--pause:hover:not(:disabled) {
  background: transparent;
  color: var(--accent-yellow);
  box-shadow: var(--glow-yellow);
}

.btn--resume {
  background: var(--accent-green);
  color: var(--bg-primary);
  border-color: var(--accent-green);
  font-weight: 600;
}

.btn--resume:hover:not(:disabled) {
  background: transparent;
  color: var(--accent-green);
  box-shadow: var(--glow-green);
}

.btn--algo {
  background: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--border-subtle);
  position: relative;
}

.btn--algo:hover:not(:disabled) {
  background: var(--bg-elevated);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* Algorithm speed indicators */
.btn--fast {
  border-left: 3px solid var(--accent-green);
}

.btn--medium {
  border-left: 3px solid var(--accent-yellow);
}

.btn--slow {
  border-left: 3px solid var(--accent-orange);
}

.btn-icon {
  font-size: 1rem;
  font-weight: 700;
}

/* Copy button */
.btn--copy {
  background: var(--bg-elevated);
  color: var(--text-secondary);
  border-color: var(--border-subtle);
  font-size: 0.7rem;
  padding: var(--space-xs) var(--space-sm);
  margin-top: var(--space-sm);
}

.btn--copy:hover {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
}

.btn--copy.copied {
  background: var(--accent-green);
  color: var(--bg-primary);
  border-color: var(--accent-green);
}

/* Disabled state */
.btn.disabled,
.btn:disabled {
  background: var(--bg-surface) !important;
  color: var(--text-muted) !important;
  border-color: var(--border-subtle) !important;
  cursor: not-allowed;
  box-shadow: none !important;
  opacity: 0.5;
}

/* Slider Controls */
.slider-control {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  min-width: 140px;
}

.slider-control label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.slider-label {
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.slider-value {
  color: var(--accent-cyan);
  font-weight: 600;
  min-width: 28px;
  text-align: right;
}

/* Custom range slider */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--bg-surface);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  background: var(--accent-cyan);
  border-radius: 50%;
  cursor: pointer;
  transition: var(--transition-fast);
  box-shadow: 0 0 10px rgba(0, 245, 212, 0.5);
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: var(--glow-cyan);
}

input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  background: var(--accent-cyan);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  transition: var(--transition-fast);
  box-shadow: 0 0 10px rgba(0, 245, 212, 0.5);
}

/* ============================================
   LEGEND
   ============================================ */
.legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-xl);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.legend-color {
  width: 14px;
  height: 14px;
  border-radius: 2px;
}

.legend-color--default {
  background: var(--bar-default);
  box-shadow: 0 0 8px rgba(76, 201, 240, 0.4);
}

.legend-color--active {
  background: var(--bar-active);
  box-shadow: 0 0 8px rgba(254, 228, 64, 0.5);
}

.legend-color--comparing {
  background: var(--bar-comparing);
  box-shadow: 0 0 8px rgba(247, 37, 133, 0.5);
}

.legend-color--swapping {
  background: var(--bar-swapping);
  box-shadow: 0 0 8px rgba(255, 107, 53, 0.5);
}

.legend-color--sorted {
  background: var(--bar-sorted);
  box-shadow: 0 0 8px rgba(122, 229, 130, 0.5);
}

/* ============================================
   ALGORITHM INFO PANEL
   ============================================ */
.algo-info-panel {
  position: fixed;
  top: 0;
  right: -420px;
  width: 400px;
  max-width: 90vw;
  height: 100vh;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border-subtle);
  z-index: 1000;
  overflow-y: auto;
  transition: right 0.3s ease;
  box-shadow: -10px 0 40px rgba(0, 0, 0, 0.5);
}

.algo-info-panel.visible {
  right: 0;
}

.algo-info-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-lg);
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 10;
}

.algo-info-header h3 {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent-cyan);
}

.algo-info-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  padding: var(--space-xs);
  line-height: 1;
  transition: var(--transition-fast);
}

.algo-info-close:hover {
  color: var(--accent-magenta);
}

.algo-description {
  padding: var(--space-md) var(--space-lg);
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  border-bottom: 1px solid var(--border-subtle);
}

/* Complexity Grid */
.complexity-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-subtle);
}

.complexity-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  padding: var(--space-sm);
  background: var(--bg-surface);
  border-radius: 4px;
}

.complexity-label {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
}

.complexity-value {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
}

.complexity--best {
  color: var(--accent-green);
}

.complexity--avg {
  color: var(--accent-yellow);
}

.complexity--worst {
  color: var(--accent-magenta);
}

.complexity--space {
  color: var(--accent-cyan);
}

/* Code Sections */
.code-section {
  border-bottom: 1px solid var(--border-subtle);
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-elevated);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-primary);
  transition: var(--transition-fast);
}

.code-header:hover {
  background: var(--bg-surface);
}

.toggle-icon {
  font-size: 0.75rem;
  transition: transform 0.2s ease;
}

.toggle-icon.collapsed {
  transform: rotate(-90deg);
}

.code-content {
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-primary);
  max-height: 400px;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.code-content.collapsed {
  max-height: 0;
  padding-top: 0;
  padding-bottom: 0;
}

.code-content pre {
  margin: 0;
  overflow-x: auto;
}

.code-content code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--text-secondary);
  white-space: pre;
  display: block;
}

/* ============================================
   VISUALIZER AREA
   ============================================ */
.visualizer {
  flex: 1;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: var(--space-2xl) var(--space-xl);
  padding-bottom: var(--space-xl);
  min-height: 400px;
  position: relative;
}

.content {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 3px;
  height: 100%;
  width: 100%;
  position: relative;
}

/* ============================================
   BAR STYLING - VISUAL STATE COLORS
   ============================================ */
.bar {
  position: relative;
  border-radius: 3px 3px 0 0;
  background: linear-gradient(180deg, var(--bar-default) 0%, #2d7dd2 100%);
  box-shadow: 0 0 10px rgba(76, 201, 240, 0.3);
  transition: background 120ms ease, box-shadow 120ms ease;
}

/* State: Active - Currently being examined */
.bar.active {
  background: linear-gradient(180deg, var(--bar-active) 0%, #e5c93d 100%);
  box-shadow: var(--glow-yellow);
}

/* State: Comparing - Being compared */
.bar.comparing {
  background: linear-gradient(180deg, var(--bar-comparing) 0%, #c4206a 100%);
  box-shadow: var(--glow-magenta);
}

/* State: Swapping - Currently being swapped */
.bar.swapping {
  background: linear-gradient(180deg, var(--bar-swapping) 0%, #e05a2b 100%);
  box-shadow: var(--glow-orange);
  animation: swap-pulse 200ms ease-in-out;
}

/* State: Sorted - In final position */
.bar.sorted {
  background: linear-gradient(180deg, var(--bar-sorted) 0%, #5bc462 100%);
  box-shadow: var(--glow-green);
}

@keyframes swap-pulse {
  0%, 100% { transform: scaleY(1); }
  50% { transform: scaleY(1.05); }
}

.bar_id {
  position: absolute;
  top: -22px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
}

/* ============================================
   INFO TOGGLE BUTTON
   ============================================ */
.info-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 50%;
  cursor: pointer;
  transition: var(--transition-fast);
  margin-left: auto;
}

.info-toggle.visible {
  display: flex;
}

.info-toggle:hover {
  background: var(--bg-elevated);
  border-color: var(--accent-cyan);
}

.info-toggle-icon {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  font-style: italic;
  color: var(--accent-cyan);
}

/* ============================================
   FOOTER - Minimal Signature
   ============================================ */
.footer {
  padding: var(--space-sm) var(--space-xl);
  background: transparent;
  display: flex;
  justify-content: flex-end;
}

.signature {
  display: flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  opacity: 0.6;
  transition: var(--transition-base);
}

.signature:hover {
  opacity: 1;
  color: var(--text-secondary);
}

.signature-dash {
  font-weight: 300;
}

.signature-name {
  font-weight: 500;
  letter-spacing: -0.5px;
}

.signature:hover .signature-name {
  color: var(--accent-cyan);
}

/* ============================================
   RESPONSIVE - TABLET & UP
   ============================================ */
@media (max-width: 1024px) {
  .controls {
    gap: var(--space-md);
    padding: var(--space-md);
  }
  
  .control-group--sliders {
    gap: var(--space-lg);
  }
  
  .algo-info-panel {
    width: 350px;
  }
}

@media (max-width: 900px) {
  .controls {
    flex-direction: column;
    gap: var(--space-md);
  }
  
  .control-group--algorithms {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .header {
    padding: var(--space-md);
  }
  
  .logo {
    font-size: 2rem;
  }
  
  .algo-info-panel {
    width: 100%;
    max-width: 100vw;
    right: -100%;
  }
  
  .algo-info-panel.visible {
    right: 0;
  }
}

@media (max-width: 768px) {
  .legend {
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
  }
  
  .legend-item {
    font-size: 0.6rem;
  }
  
  .legend-color {
    width: 10px;
    height: 10px;
  }
  
  .visualizer {
    min-height: 300px;
    padding: var(--space-lg);
  }
}

/* Landscape mobile - allow usage */
@media (max-width: 767px) and (orientation: landscape) {
  .mobile-overlay {
    display: none !important;
  }
  
  .header {
    padding: var(--space-sm) var(--space-md);
  }
  
  .logo {
    font-size: 1.5rem;
  }
  
  .tagline {
    font-size: 0.7rem;
  }
  
  .controls {
    padding: var(--space-sm) var(--space-md);
    gap: var(--space-sm);
  }
  
  .btn {
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.7rem;
  }
  
  .slider-control {
    min-width: 100px;
  }
  
  .legend {
    padding: var(--space-xs) var(--space-md);
  }
  
  .visualizer {
    min-height: 200px;
    padding: var(--space-md);
  }
  
  .footer {
    padding: var(--space-sm);
  }
  
  .footer-name {
    font-size: 0.875rem;
  }
  
  .footer-domain {
    font-size: 0.75rem;
  }
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.btn.disabled .btn-icon {
  animation: pulse 1s ease-in-out infinite;
}