/* Proximity Playground - Blueprint Theme */

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

:root {
  --bg-primary: #0a0e14;
  --bg-secondary: #1a1f2e;
  --bg-tertiary: #252b3b;
  --text-primary: #e6e6e6;
  --text-secondary: #8b949e;
  --accent-cyan: #00d4ff;
  --accent-blue: #3b82f6;
  --accent-orange: #f97316;
  --accent-magenta: #d946ef;
  --accent-yellow: #fef08a;
  --border-color: #30363d;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
}

#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* Header */
header {
  padding: 1rem 2rem;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header-title {
  flex: 1;
}

header h1 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--accent-cyan);
}

header .subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

.about-btn {
  flex: none;
  padding: 0.5rem 1rem;
  background: transparent;
  border: 1px solid var(--accent-cyan);
  color: var(--accent-cyan);
  cursor: pointer;
  transition: all 0.2s ease;
}

.about-btn:hover {
  background: var(--accent-cyan);
  color: var(--bg-primary);
}

/* Main Layout */
main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

#canvas-container {
  flex: 1;
  position: relative;
  background: 
    linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
  background-size: 20px 20px;
}

#canvas-container canvas {
  display: block;
}

/* Control Panel */
#control-panel {
  width: 280px;
  background-color: var(--bg-secondary);
  border-left: 1px solid var(--border-color);
  padding: 1rem;
  overflow-y: auto;
}

.control-group {
  margin-bottom: 1.5rem;
}

.control-group h2 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

/* Range Slider */
.control-row {
  margin-bottom: 0.75rem;
}

.control-row label {
  display: block;
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
}

.control-row label span {
  color: var(--accent-cyan);
  font-weight: 600;
}

input[type="range"] {
  width: 100%;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  background: var(--accent-cyan);
  border-radius: 50%;
  cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: var(--accent-cyan);
  border-radius: 50%;
  cursor: pointer;
  border: none;
}

/* Buttons */
.button-row {
  display: flex;
  gap: 0.5rem;
}

button {
  flex: 1;
  padding: 0.5rem 1rem;
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

button:hover {
  background-color: var(--accent-cyan);
  color: var(--bg-primary);
  border-color: var(--accent-cyan);
}

button:active {
  transform: scale(0.98);
}

/* Preset Grid */
.preset-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.4rem;
  margin-bottom: 0.5rem;
}

.preset-btn {
  padding: 0.4rem 0.5rem;
  font-size: 0.75rem;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
}

.preset-btn:hover {
  background-color: var(--accent-magenta);
  border-color: var(--accent-magenta);
}

.preset-hint {
  font-size: 0.7rem;
  color: var(--text-secondary);
  font-style: italic;
  text-align: center;
}

/* Toggle Switches */
.toggle-row {
  margin-bottom: 0.5rem;
}

.toggle {
  display: flex;
  align-items: center;
  cursor: pointer;
}

.toggle input[type="checkbox"] {
  width: 40px;
  height: 20px;
  appearance: none;
  background: var(--bg-tertiary);
  border-radius: 10px;
  position: relative;
  cursor: pointer;
  transition: background 0.3s ease;
}

.toggle input[type="checkbox"]::before {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  background: var(--text-secondary);
  border-radius: 50%;
  top: 2px;
  left: 2px;
  transition: all 0.3s ease;
}

.toggle input[type="checkbox"]:checked {
  background: var(--accent-cyan);
}

.toggle input[type="checkbox"]:checked::before {
  left: 22px;
  background: var(--bg-primary);
}

.toggle-label {
  margin-left: 0.75rem;
  font-size: 0.875rem;
}

/* Graph-specific colors for labels */
.toggle-label.dt { color: var(--accent-cyan); }
.toggle-label.gg { color: var(--accent-blue); }
.toggle-label.ug { color: var(--accent-orange); }
.toggle-label.voronoi { color: var(--accent-magenta); }

/* Info Panel */
#info-panel {
  background: var(--bg-tertiary);
  padding: 0.75rem;
  border-radius: 4px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

#info-panel p {
  margin-bottom: 0.5rem;
}

#info-panel p:last-child {
  margin-bottom: 0;
}

#info-panel strong {
  color: var(--text-primary);
}

#info-panel .dt { color: var(--accent-cyan); font-weight: 600; }
#info-panel .gg { color: var(--accent-blue); font-weight: 600; }
#info-panel .ug { color: var(--accent-orange); font-weight: 600; }

#info-panel .hint {
  font-size: 0.75rem;
  font-style: italic;
  margin-top: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border-color);
}

/* View Mode Buttons */
.view-modes {
  margin-bottom: 0.5rem;
}

.mode-btn.active {
  background-color: var(--accent-cyan);
  color: var(--bg-primary);
  border-color: var(--accent-cyan);
}

.mode-description {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-style: italic;
  margin-top: 0.25rem;
}

/* Legend */
.legend {
  font-size: 0.75rem;
}

.legend-item {
  display: flex;
  align-items: center;
  margin-bottom: 0.5rem;
  gap: 0.5rem;
}

.legend-item:last-child {
  margin-bottom: 0;
}

.legend-color {
  width: 16px;
  height: 3px;
  border-radius: 1px;
  flex-shrink: 0;
}

.legend-color.dt-color { background-color: var(--accent-cyan); opacity: 0.5; }
.legend-color.gg-color { background-color: var(--accent-blue); }
.legend-color.ug-color { background-color: var(--accent-orange); }
.legend-color.voronoi-color { 
  background: repeating-linear-gradient(
    90deg,
    var(--accent-magenta) 0px,
    var(--accent-magenta) 3px,
    transparent 3px,
    transparent 6px
  );
}

/* Collapsible Sections */
.collapsible-header {
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.collapsible-header:hover {
  color: var(--accent-cyan);
}

.collapse-icon {
  font-size: 0.6rem;
  transition: transform 0.2s ease;
}

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

.collapsible-content {
  max-height: 500px;
  overflow: hidden;
  transition: max-height 0.3s ease, opacity 0.3s ease;
  opacity: 1;
}

.collapsible.collapsed .collapsible-content {
  max-height: 0;
  opacity: 0;
}

/* How It Works Section */
.how-it-works {
  font-size: 0.75rem;
}

.algorithm-item {
  margin-bottom: 0.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.algorithm-item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.algorithm-item strong {
  display: block;
  margin-bottom: 0.25rem;
}

.algorithm-item strong.dt { color: var(--accent-cyan); }
.algorithm-item strong.gg { color: var(--accent-blue); }
.algorithm-item strong.ug { color: var(--accent-orange); }
.algorithm-item strong.voronoi { color: var(--accent-magenta); }

.algorithm-item p {
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.4;
}

/* Keyboard Shortcuts */
.shortcuts {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.shortcut {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
}

.shortcut:last-child {
  margin-bottom: 0;
}

kbd {
  display: inline-block;
  padding: 0.15rem 0.4rem;
  font-family: monospace;
  font-size: 0.7rem;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  color: var(--accent-cyan);
  min-width: 1.2rem;
  text-align: center;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  z-index: 1000;
  overflow-y: auto;
  padding: 2rem;
  box-sizing: border-box;
}

.modal.active {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  animation: fadeIn 0.2s ease;
}

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

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  max-width: 600px;
  width: 100%;
  padding: 2rem;
  position: relative;
  animation: slideIn 0.3s ease;
}

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

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  width: auto;
  padding: 0.25rem 0.5rem;
  line-height: 1;
}

.modal-close:hover {
  color: var(--text-primary);
  background: none;
}

.modal-content h2 {
  color: var(--accent-cyan);
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
}

.modal-section {
  margin-bottom: 1.5rem;
}

.modal-section h3 {
  color: var(--text-primary);
  font-size: 1rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.modal-section p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 0.5rem;
}

.modal-section ul {
  list-style: none;
  padding: 0;
}

.modal-section li {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
  padding-left: 1rem;
  position: relative;
  margin-bottom: 0.5rem;
}

.modal-section li::before {
  content: '•';
  color: var(--accent-cyan);
  position: absolute;
  left: 0;
}

.modal-section li strong {
  color: var(--text-primary);
}

.hierarchy-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem;
  background: var(--bg-tertiary);
  border-radius: 4px;
  margin: 1rem 0;
}

.hierarchy-item {
  padding: 0.5rem 1rem;
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.9rem;
}

.hierarchy-item.dt { background: var(--accent-cyan); color: var(--bg-primary); }
.hierarchy-item.gg { background: var(--accent-blue); color: white; }
.hierarchy-item.ug { background: var(--accent-orange); color: var(--bg-primary); }

.hierarchy-arrow {
  color: var(--text-secondary);
  font-size: 1.2rem;
}

.hierarchy-note {
  font-style: italic;
  text-align: center;
}

.modal-footer {
  text-align: center;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
  margin-top: 1rem;
}

.modal-footer p {
  color: var(--text-secondary);
  font-size: 0.8rem;
}

/* Responsive */
@media (max-width: 768px) {
  main {
    flex-direction: column;
  }
  
  #control-panel {
    width: 100%;
    border-left: none;
    border-top: 1px solid var(--border-color);
    max-height: 40vh;
  }
}