style.css

/* =======================================
   DIVIDE & CONQUER ALGORITHM VISUALIZER
   Premium Dark Theme
   ======================================= */

:root {
  /* Color Palette */
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: #1a2035;
  --bg-card-hover: #1f2847;
  --bg-glass: rgba(26, 32, 53, 0.85);

  --text-primary: #e8ecf4;
  --text-secondary: #8892a8;
  --text-muted: #5a6478;

  --accent-1: #7c5cfc;
  --accent-2: #00d4ff;
  --accent-3: #ff6b9d;
  --accent-4: #ffd166;
  --accent-5: #06d6a0;

  --gradient-primary: linear-gradient(135deg, #7c5cfc, #00d4ff);
  --gradient-warm: linear-gradient(135deg, #ff6b9d, #ffd166);
  --gradient-cool: linear-gradient(135deg, #06d6a0, #00d4ff);

  /* Sorting Colors */
  --bar-default: #4a5580;
  --bar-comparing: #ff6b9d;
  --bar-sorted: #06d6a0;
  --bar-pivot: #ffd166;
  --bar-active: #7c5cfc;
  --bar-left: #00d4ff;
  --bar-right: #ff6b9d;
  --bar-merging: #ffd166;

  /* Phase Colors */
  --phase-divide: #ff6b9d;
  --phase-conquer: #ffd166;
  --phase-combine: #06d6a0;
  --phase-ready: #8892a8;
  --phase-complete: #7c5cfc;

  /* Layout */
  --sidebar-width: 280px;
  --panel-width: 320px;
  --header-height: 60px;
  --controls-height: 70px;
  --step-info-height: 60px;
  --radius: 12px;
  --radius-sm: 8px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-medium: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* =======================================
   RESET & BASE
   ======================================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  display: flex;
}

::selection {
  background: rgba(124, 92, 252, 0.3);
  color: var(--text-primary);
}

::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* =======================================
   SIDEBAR
   ======================================= */
#sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-secondary);
  border-right: 1px solid rgba(255,255,255,0.06);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  transition: transform var(--transition-medium), width var(--transition-medium);
  z-index: 100;
}

#sidebar.collapsed {
  transform: translateX(-100%);
  width: 0;
  min-width: 0;
  border: none;
}

.sidebar-header {
  padding: 20px 20px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  font-size: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--gradient-primary);
  border-radius: var(--radius-sm);
}

.logo h1 {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.3px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo .subtitle {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 400;
  margin-top: 2px;
}

.algo-category {
  padding: 12px 14px 4px;
}

.category-label {
  display: block;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text-muted);
  padding: 0 8px;
  margin-bottom: 6px;
}

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

.algo-category li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  margin-bottom: 2px;
}

.algo-category li:hover {
  background: var(--bg-card-hover);
}

.algo-category li.active {
  background: rgba(124, 92, 252, 0.15);
  border: 1px solid rgba(124, 92, 252, 0.3);
}

.algo-category li.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 60%;
  background: var(--gradient-primary);
  border-radius: 0 3px 3px 0;
}

.algo-icon {
  font-size: 16px;
  flex-shrink: 0;
}

.algo-name {
  font-size: 13px;
  font-weight: 500;
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.algo-badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  font-weight: 500;
  color: var(--accent-2);
  background: rgba(0, 212, 255, 0.1);
  padding: 2px 6px;
  border-radius: 4px;
  flex-shrink: 0;
}

/* =======================================
   MAIN CONTENT
   ======================================= */
#main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100vh;
  min-width: 0;
  overflow: hidden;
}

/* Top Bar */
#top-bar {
  height: var(--header-height);
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  background: var(--bg-secondary);
}

.top-bar-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

#sidebar-toggle {
  background: none;
  border: 1px solid rgba(255,255,255,0.1);
  color: var(--text-secondary);
  font-size: 18px;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

#sidebar-toggle:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}

#algo-title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

#phase-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: all var(--transition-medium);
}

.phase-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  transition: background var(--transition-medium);
}

#phase-badge.phase-ready {
  background: rgba(136, 146, 168, 0.15);
  color: var(--phase-ready);
}
#phase-badge.phase-ready .phase-dot { background: var(--phase-ready); }

#phase-badge.phase-divide {
  background: rgba(255, 107, 157, 0.15);
  color: var(--phase-divide);
}
#phase-badge.phase-divide .phase-dot {
  background: var(--phase-divide);
  animation: pulse 1s infinite;
}

#phase-badge.phase-conquer {
  background: rgba(255, 209, 102, 0.15);
  color: var(--phase-conquer);
}
#phase-badge.phase-conquer .phase-dot {
  background: var(--phase-conquer);
  animation: pulse 1s infinite;
}

#phase-badge.phase-combine {
  background: rgba(6, 214, 160, 0.15);
  color: var(--phase-combine);
}
#phase-badge.phase-combine .phase-dot {
  background: var(--phase-combine);
  animation: pulse 1s infinite;
}

#phase-badge.phase-complete {
  background: rgba(124, 92, 252, 0.15);
  color: var(--phase-complete);
}
#phase-badge.phase-complete .phase-dot {
  background: var(--phase-complete);
  box-shadow: 0 0 8px var(--phase-complete);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* Visualization */
#viz-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  overflow: auto;
  min-height: 0;
}

#visualization {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,0.04);
  position: relative;
  overflow: hidden;
}

.viz-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  color: var(--text-muted);
}

.placeholder-icon {
  font-size: 48px;
  opacity: 0.5;
}

.viz-placeholder p {
  font-size: 14px;
  text-align: center;
}

/* Step Info */
#step-info {
  min-height: var(--step-info-height);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 24px;
  background: var(--bg-secondary);
  border-top: 1px solid rgba(255,255,255,0.04);
}

#step-phase-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 4px 10px;
  border-radius: 4px;
  flex-shrink: 0;
  display: none;
}

#step-phase-label.show { display: inline-block; }

#step-phase-label.divide {
  background: rgba(255, 107, 157, 0.15);
  color: var(--phase-divide);
}
#step-phase-label.conquer {
  background: rgba(255, 209, 102, 0.15);
  color: var(--phase-conquer);
}
#step-phase-label.combine {
  background: rgba(6, 214, 160, 0.15);
  color: var(--phase-combine);
}
#step-phase-label.complete {
  background: rgba(124, 92, 252, 0.15);
  color: var(--phase-complete);
}
#step-phase-label.base {
  background: rgba(0, 212, 255, 0.15);
  color: var(--accent-2);
}

#step-description {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Controls */
#controls {
  height: var(--controls-height);
  min-height: var(--controls-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  background: var(--bg-secondary);
  border-top: 1px solid rgba(255,255,255,0.06);
}

.controls-left, .controls-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

button {
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  border: none;
  outline: none;
  transition: all var(--transition-fast);
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  font-size: 13px;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 4px 15px rgba(124, 92, 252, 0.3);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(124, 92, 252, 0.4);
}

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

.btn-group {
  display: flex;
  gap: 2px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  padding: 3px;
}

.btn-control {
  background: transparent;
  color: var(--text-secondary);
  font-size: 16px;
  padding: 8px 14px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-control:hover:not(:disabled) {
  background: var(--bg-card-hover);
  color: var(--text-primary);
}

.btn-control:disabled {
  opacity: 0.3;
  cursor: default;
}

.btn-play {
  color: var(--accent-1);
  font-size: 18px;
}

.btn-play:hover:not(:disabled) {
  color: var(--accent-2);
}

.speed-control {
  display: flex;
  align-items: center;
  gap: 10px;
}

.speed-control label {
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
}

#speed-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100px;
  height: 4px;
  background: var(--bg-card);
  border-radius: 2px;
  outline: none;
}

#speed-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent-1);
  cursor: pointer;
  box-shadow: 0 0 6px rgba(124, 92, 252, 0.5);
}

#step-counter {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--text-muted);
  background: var(--bg-card);
  padding: 6px 12px;
  border-radius: 6px;
}

#step-counter span {
  color: var(--accent-2);
  font-weight: 600;
}

/* =======================================
   COMPLEXITY PANEL
   ======================================= */
#complexity-panel {
  width: var(--panel-width);
  min-width: var(--panel-width);
  height: 100vh;
  background: var(--bg-secondary);
  border-left: 1px solid rgba(255,255,255,0.06);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  transition: transform var(--transition-medium), width var(--transition-medium);
}

#complexity-panel.collapsed {
  transform: translateX(100%);
  width: 0;
  min-width: 0;
  border: none;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.panel-header h3 {
  font-size: 14px;
  font-weight: 700;
}

#panel-toggle {
  background: none;
  border: 1px solid rgba(255,255,255,0.1);
  color: var(--text-muted);
  font-size: 12px;
  padding: 4px 8px;
  border-radius: 4px;
}

#panel-toggle:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}

#complexity-content {
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.complexity-section h4 {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.formula-box {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  line-height: 1.7;
  padding: 14px 16px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255,255,255,0.04);
  color: var(--text-primary);
}

.big-o-result {
  font-size: 20px;
  font-weight: 700;
  text-align: center;
  padding: 20px;
  background: rgba(124, 92, 252, 0.1);
  border: 1px solid rgba(124, 92, 252, 0.2);
  color: var(--accent-1);
}

.analysis-box {
  font-size: 12px;
  line-height: 1.8;
  padding: 14px 16px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255,255,255,0.04);
  color: var(--text-secondary);
}

.result-section {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 20px;
}

.steps-box {
  font-size: 12px;
  line-height: 1.8;
  color: var(--text-secondary);
}

.steps-box ol {
  padding-left: 18px;
}

.steps-box li {
  margin-bottom: 4px;
}

.steps-box .step-divide { color: var(--phase-divide); }
.steps-box .step-conquer { color: var(--phase-conquer); }
.steps-box .step-combine { color: var(--phase-combine); }

/* =======================================
   VISUALIZATION STYLES
   ======================================= */

/* --- Bar Chart (Merge Sort, Quick Sort) --- */
.bars-container {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 3px;
  height: 100%;
  width: 100%;
  padding: 40px 30px 30px;
}

.bar-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
  max-width: 60px;
  height: 100%;
  justify-content: flex-end;
  transition: all 0.3s ease;
}

.bar {
  width: 100%;
  border-radius: 4px 4px 0 0;
  background: var(--bar-default);
  transition: all 0.3s ease;
  position: relative;
  min-height: 8px;
}

.bar-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 6px;
  text-align: center;
}

.bar.comparing {
  background: var(--bar-comparing);
  box-shadow: 0 0 15px rgba(255, 107, 157, 0.4);
}

.bar.sorted {
  background: var(--bar-sorted);
  box-shadow: 0 0 10px rgba(6, 214, 160, 0.3);
}

.bar.pivot {
  background: var(--bar-pivot);
  box-shadow: 0 0 15px rgba(255, 209, 102, 0.4);
}

.bar.active {
  background: var(--bar-active);
  box-shadow: 0 0 12px rgba(124, 92, 252, 0.4);
}

.bar.left-part {
  background: var(--bar-left);
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.3);
}

.bar.right-part {
  background: var(--bar-right);
  box-shadow: 0 0 10px rgba(255, 107, 157, 0.3);
}

.bar.merging {
  background: var(--bar-merging);
  box-shadow: 0 0 12px rgba(255, 209, 102, 0.4);
}

.bar.min-val {
  background: var(--accent-5);
  box-shadow: 0 0 12px rgba(6, 214, 160, 0.4);
}

.bar.max-val {
  background: var(--accent-3);
  box-shadow: 0 0 12px rgba(255, 107, 157, 0.4);
}

/* Sub-array bracket indicator */
.subarray-indicator {
  position: absolute;
  bottom: -20px;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: 2px;
  transition: all 0.3s ease;
}

/* --- Card Array (Min/Max, Largest Subarray) --- */
.cards-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  width: 100%;
  height: 100%;
  padding: 30px;
}

.cards-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
}

.card {
  font-family: 'JetBrains Mono', monospace;
  font-size: 16px;
  font-weight: 600;
  min-width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--bg-card-hover);
  border: 2px solid rgba(255,255,255,0.06);
  transition: all 0.3s ease;
  color: var(--text-primary);
}

.card.highlight-left {
  border-color: var(--accent-2);
  background: rgba(0, 212, 255, 0.15);
  color: var(--accent-2);
}

.card.highlight-right {
  border-color: var(--accent-3);
  background: rgba(255, 107, 157, 0.15);
  color: var(--accent-3);
}

.card.highlight-cross {
  border-color: var(--accent-4);
  background: rgba(255, 209, 102, 0.15);
  color: var(--accent-4);
}

.card.highlight-active {
  border-color: var(--accent-1);
  background: rgba(124, 92, 252, 0.15);
  color: var(--accent-1);
  transform: scale(1.1);
}

.card.highlight-result {
  border-color: var(--accent-5);
  background: rgba(6, 214, 160, 0.15);
  color: var(--accent-5);
  box-shadow: 0 0 15px rgba(6, 214, 160, 0.3);
}

.card.highlight-min {
  border-color: var(--accent-5);
  background: rgba(6, 214, 160, 0.2);
  color: var(--accent-5);
}

.card.highlight-max {
  border-color: var(--accent-3);
  background: rgba(255, 107, 157, 0.2);
  color: var(--accent-3);
}

.card.dimmed {
  opacity: 0.3;
}

.cards-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.cards-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 18px;
  font-weight: 700;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  background: rgba(124, 92, 252, 0.1);
  border: 1px solid rgba(124, 92, 252, 0.2);
  color: var(--accent-1);
}

.cards-info-row {
  display: flex;
  gap: 24px;
  align-items: center;
}

.divider-line {
  width: 2px;
  height: 60px;
  background: var(--accent-4);
  border-radius: 1px;
  opacity: 0.6;
}

/* --- SVG Scatter Plot (Closest Pair, Convex Hull) --- */
.scatter-container {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.scatter-container svg {
  width: 100%;
  height: 100%;
}

.scatter-point {
  fill: var(--accent-2);
  transition: all 0.3s ease;
}

.scatter-point.left-set { fill: var(--accent-2); }
.scatter-point.right-set { fill: var(--accent-3); }
.scatter-point.highlight { fill: var(--accent-4); r: 7; }
.scatter-point.result {
  fill: var(--accent-5);
  r: 8;
  filter: drop-shadow(0 0 6px rgba(6, 214, 160, 0.6));
}

.scatter-line {
  stroke: rgba(255,255,255,0.15);
  stroke-width: 1;
}

.scatter-divider {
  stroke: var(--accent-4);
  stroke-width: 2;
  stroke-dasharray: 6 4;
  opacity: 0.6;
}

.scatter-connection {
  stroke: var(--accent-5);
  stroke-width: 2.5;
  filter: drop-shadow(0 0 4px rgba(6, 214, 160, 0.5));
}

.scatter-hull {
  fill: none;
  stroke: var(--accent-1);
  stroke-width: 2;
  filter: drop-shadow(0 0 4px rgba(124, 92, 252, 0.5));
}

.scatter-hull-fill {
  fill: rgba(124, 92, 252, 0.08);
  stroke: none;
}

.scatter-strip {
  fill: rgba(255, 209, 102, 0.06);
  stroke: var(--accent-4);
  stroke-width: 1;
  stroke-dasharray: 4 4;
}

.scatter-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  fill: var(--text-muted);
}

/* --- Matrix Grid --- */
.matrix-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  width: 100%;
  height: 100%;
  padding: 20px;
}

.matrix-row-display {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.matrix-grid {
  display: inline-grid;
  gap: 2px;
  padding: 4px;
  border-radius: var(--radius-sm);
  border: 2px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.02);
}

.matrix-cell {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  font-weight: 500;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  background: var(--bg-card-hover);
  transition: all 0.3s ease;
  color: var(--text-primary);
}

.matrix-cell.quad-tl {
  background: rgba(0, 212, 255, 0.15);
  border: 1px solid rgba(0, 212, 255, 0.3);
  color: var(--accent-2);
}

.matrix-cell.quad-tr {
  background: rgba(255, 107, 157, 0.15);
  border: 1px solid rgba(255, 107, 157, 0.3);
  color: var(--accent-3);
}

.matrix-cell.quad-bl {
  background: rgba(255, 209, 102, 0.15);
  border: 1px solid rgba(255, 209, 102, 0.3);
  color: var(--accent-4);
}

.matrix-cell.quad-br {
  background: rgba(124, 92, 252, 0.15);
  border: 1px solid rgba(124, 92, 252, 0.3);
  color: var(--accent-1);
}

.matrix-cell.computing {
  background: rgba(6, 214, 160, 0.2);
  border: 1px solid rgba(6, 214, 160, 0.4);
  color: var(--accent-5);
  box-shadow: 0 0 10px rgba(6, 214, 160, 0.3);
}

.matrix-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-muted);
  text-align: center;
}

.matrix-operator {
  font-size: 24px;
  font-weight: 300;
  color: var(--text-muted);
}

.matrix-formula-display {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--accent-4);
  background: rgba(255, 209, 102, 0.08);
  padding: 8px 14px;
  border-radius: 6px;
  border: 1px solid rgba(255, 209, 102, 0.15);
  text-align: center;
  max-width: 100%;
}

/* =======================================
   ANIMATIONS
   ======================================= */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

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

@keyframes glow {
  0%, 100% { box-shadow: 0 0 5px rgba(124, 92, 252, 0.3); }
  50% { box-shadow: 0 0 20px rgba(124, 92, 252, 0.6); }
}

.animate-in {
  animation: fadeIn 0.3s ease forwards;
}

/* =======================================
   RESPONSIVE
   ======================================= */
@media (max-width: 1200px) {
  #complexity-panel {
    width: 260px;
    min-width: 260px;
  }
}

@media (max-width: 1000px) {
  #complexity-panel {
    position: fixed;
    right: 0;
    top: 0;
    z-index: 200;
    width: 320px;
    min-width: 320px;
    box-shadow: -4px 0 20px rgba(0,0,0,0.5);
    transform: translateX(100%);
  }
  #complexity-panel.show-mobile {
    transform: translateX(0);
  }
}

@media (max-width: 768px) {
  #sidebar {
    position: fixed;
    z-index: 200;
    box-shadow: 4px 0 20px rgba(0,0,0,0.5);
  }
  :root {
    --sidebar-width: 260px;
  }
  #controls {
    flex-wrap: wrap;
    height: auto;
    padding: 12px;
    gap: 8px;
  }
}