/* Base Design System & Core Styles (Light Laboratory Theme) */
:root {
  --bg-dark: #f8fafc;
  --panel-bg: rgba(255, 255, 255, 0.75);
  --panel-border: rgba(15, 23, 42, 0.08);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --accent-blue: #2563eb;
  --accent-glow: rgba(37, 99, 235, 0.12);
  
  /* Status Colors (Optimized for light background) */
  --color-real: #059669;
  --color-real-glow: rgba(5, 150, 105, 0.15);
  --color-virtual: #7c3aed;
  --color-virtual-glow: rgba(124, 58, 237, 0.15);
  --color-warning: #d97706;
  --color-danger: #dc2626;
  /* Ray Colors (High visibility saturated colors) */
  --color-ray-parallel: #0891b2;
  --color-ray-central: #ca8a04;
  --color-ray-focal: #db2777;
  --color-ray-virtual: #4f46e5;
  --font-main: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'Fira Code', monospace;
  --panel-left: 20px;
  
  --transition-speed: 0.25s;
}
/* Scrollbar Customization */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: rgba(15, 23, 42, 0.02);
}
::-webkit-scrollbar-thumb {
  background: rgba(15, 23, 42, 0.12);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(15, 23, 42, 0.25);
}
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: var(--font-main);
  background-color: var(--bg-dark);
  color: var(--text-primary);
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  user-select: none;
}
#app-container {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  overflow: hidden;
}
#canvas-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  touch-action: none;
}
#canvas-container canvas {
  display: block;
  touch-action: none;
}
/* Glassmorphic Panel Base */
.glass-panel {
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--panel-border);
  box-shadow: 0 10px 30px -10px rgba(15, 23, 42, 0.08);
  transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
}
.glass-panel:hover {
  border-color: rgba(15, 23, 42, 0.15);
}
/* Header Styling */
.app-header {
  position: static;
  z-index: 10;
  pointer-events: none;
  flex: 0 0 auto;
  min-width: 150px;
}
.app-header .logo {
  display: flex;
  align-items: center;
  gap: 6px;
}
.app-header .logo i {
  font-size: 0.95rem;
  color: var(--accent-blue);
  filter: drop-shadow(0 0 4px var(--accent-glow));
}
.app-header h1 {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0;
  background: linear-gradient(135deg, #0f172a 30%, #2563eb 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.app-header .subtitle {
  font-size: 0.55rem;
  color: var(--text-secondary);
  margin-top: 0;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
}
/* Sidebar Control Panel */
.control-panel {
  position: absolute;
  top: 20px;
  left: var(--panel-left);
  right: 60px;
  bottom: auto;
  width: auto;
  min-width: 0;
  max-width: none;
  z-index: 10;
  border-radius: 12px;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  overflow: visible;
  pointer-events: auto;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}
.control-panel.collapsed {
  transform: translateY(calc(-100% - 28px));
}
.panel-topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  min-width: 0;
}
.panel-pagination {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 2px;
  flex-shrink: 0;
  width: min(520px, 100%);
  max-width: 100%;
  padding: 3px;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 10px;
  background: rgba(15, 23, 42, 0.035);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.75);
}
.panel-page-btn {
  border: 0;
  background: transparent;
  color: var(--text-secondary);
  border-radius: 7px;
  padding: 7px 8px;
  font-family: var(--font-main);
  font-size: 0.68rem;
  font-weight: 700;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: pointer;
  transition: background var(--transition-speed), color var(--transition-speed), box-shadow var(--transition-speed);
}
.panel-page-btn:hover,
.panel-page-btn.active {
  background: #ffffff;
  color: var(--accent-blue);
  box-shadow: 0 1px 5px rgba(15, 23, 42, 0.1);
}
.panel-page {
  display: none;
  grid-template-columns: 1fr;
  gap: 12px;
  min-height: 0;
  min-width: 0;
  overflow: visible;
}
.panel-page.active {
  display: grid;
}
.panel-page[data-panel-page-content="parameters"].active {
  grid-template-columns: 1fr;
}
.panel-page[data-panel-page-content="legend"].active {
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
}
.panel-page[data-panel-page-content="modes"] .panel-section {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-content: start;
}
.panel-page[data-panel-page-content="modes"] .panel-section h2 {
  grid-column: 1 / -1;
}
.panel-page[data-panel-page-content="presets"] .panel-section {
  display: grid;
  grid-template-columns: 1fr;
  align-content: start;
}
/* Panel Tab Toggle Button */
.panel-toggle-btn {
  position: fixed;
  top: 20px;
  right: 20px;
  left: auto;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--panel-border);
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  box-shadow: 0 4px 15px -3px rgba(15, 23, 42, 0.08);
  z-index: 30;
  transition: background var(--transition-speed), color var(--transition-speed);
}
.panel-toggle-btn:hover {
  background: #ffffff;
  color: var(--accent-blue);
}
.panel-toggle-btn i {
  transition: transform 0.3s ease;
}
.panel-toggle-btn.panel-collapsed i {
  transform: none;
}
.panel-toggle-btn.panel-collapsed {
  right: 20px;
  left: auto;
  width: 32px;
  border-radius: 8px;
}
.panel-section {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}
.panel-page[data-panel-page-content="parameters"] .panel-section:first-child {
  display: flex;
  flex-flow: row wrap;
  align-items: end;
  gap: 8px 14px;
}
.panel-page[data-panel-page-content="parameters"] .panel-section:first-child h2 {
  flex: 0 0 auto;
  align-self: center;
  border-bottom: 0;
  padding-bottom: 0;
  margin-right: 2px;
}
.panel-page[data-panel-page-content="parameters"] .control-group {
  flex: 0 1 180px;
  min-width: 150px;
  max-width: 190px;
}
.panel-section h2 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-secondary);
  border-bottom: 1px solid rgba(15, 23, 42, 0.06);
  padding-bottom: 5px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.panel-section h2 i {
  color: var(--accent-blue);
}
/* Control Elements (Sliders & Selects) */
.control-group {
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.control-label {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  font-size: 0.72rem;
  color: var(--text-primary);
  font-weight: 600;
}
.value-display {
  font-family: var(--font-mono);
  color: var(--accent-blue);
  font-weight: 700;
  flex-shrink: 0;
}
/* Sliders */
input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 4px;
  background: rgba(15, 23, 42, 0.08);
  border-radius: 3px;
  outline: none;
  transition: background 0.3s;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-blue);
  cursor: pointer;
  box-shadow: 0 0 6px var(--accent-glow);
  transition: transform 0.1s, background-color var(--transition-speed);
}
input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  background: #3b82f6;
}
input[type="range"]:active::-webkit-slider-thumb {
  transform: scale(1.3);
}
/* Custom Select */
.custom-select {
  width: 100%;
  padding: 7px 9px;
  background: rgba(15, 23, 42, 0.03);
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 8px;
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 0.72rem;
  outline: none;
  cursor: pointer;
  transition: background var(--transition-speed), border-color var(--transition-speed);
}
.custom-select:hover, .custom-select:focus {
  background: rgba(15, 23, 42, 0.06);
  border-color: rgba(37, 99, 235, 0.4);
}
.custom-select option {
  background: #ffffff;
  color: var(--text-primary);
}
/* Preset Buttons Grid */
.presets-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 6px;
}
.presets-grid button:last-child {
  grid-column: auto;
}
.btn-preset {
  background: rgba(15, 23, 42, 0.02);
  border: 1px solid rgba(15, 23, 42, 0.06);
  border-radius: 8px;
  padding: 7px;
  color: var(--text-secondary);
  font-family: var(--font-main);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  transition: all var(--transition-speed);
}
.btn-preset:hover {
  background: rgba(15, 23, 42, 0.05);
  color: var(--text-primary);
  border-color: rgba(15, 23, 42, 0.15);
}
.btn-preset.active {
  background: rgba(37, 99, 235, 0.07);
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  box-shadow: 0 0 10px rgba(37, 99, 235, 0.12);
  font-weight: 600;
}
.btn-preset .preset-name {
  font-size: 0.68rem;
  font-weight: 600;
  font-family: var(--font-mono);
}
.btn-preset .preset-desc {
  font-size: 0.6rem;
  opacity: 0.8;
}
/* Toggles */
.toggle-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.toggle-switch {
  display: flex;
  align-items: center;
  cursor: pointer;
  position: relative;
}
.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}
.slider-toggle {
  position: relative;
  display: inline-block;
  width: 28px;
  height: 16px;
  background-color: rgba(15, 23, 42, 0.08);
  border-radius: 20px;
  margin-right: 8px;
  transition: background-color var(--transition-speed);
}
.slider-toggle:before {
  position: absolute;
  content: "";
  height: 10px;
  width: 10px;
  left: 3px;
  bottom: 3px;
  background-color: var(--text-secondary);
  border-radius: 50%;
  transition: transform var(--transition-speed), background-color var(--transition-speed);
}
.toggle-switch input:checked + .slider-toggle {
  background-color: var(--accent-blue);
}
.toggle-switch input:checked + .slider-toggle:before {
  transform: translateX(12px);
  background-color: #ffffff;
}
.toggle-label {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-primary);
}
/* Legend Styling */
#ray-legend {
  position: static;
  border-radius: 0;
  padding: 0;
  width: auto;
  display: flex;
  flex-direction: column;
  gap: 7px;
  pointer-events: auto;
}
.legend-title {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}
.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
}
.legend-color {
  width: 18px;
  height: 3px;
  border-radius: 2px;
  flex-shrink: 0;
}
.legend-color.parallel-ray {
  background-color: var(--color-ray-parallel);
  box-shadow: 0 0 4px var(--color-ray-parallel);
}
.legend-color.central-ray {
  background-color: var(--color-ray-central);
  box-shadow: 0 0 4px var(--color-ray-central);
}
.legend-color.focal-ray {
  background-color: var(--color-ray-focal);
  box-shadow: 0 0 4px var(--color-ray-focal);
}
.legend-color.virtual-ray {
  border-top: 2px dashed var(--color-ray-virtual);
  background-color: transparent;
  height: 0;
}
.legend-text {
  font-size: 0.68rem;
  color: var(--text-primary);
  min-width: 0;
}
/* Dashboard Panel (Bottom overlay) */
#dashboard {
  position: static;
  left: auto;
  right: auto;
  bottom: auto;
  z-index: auto;
  border-radius: 0;
  padding: 0;
  pointer-events: auto;
  transition: none;
}
#dashboard.collapsed {
  transform: none;
}
#dashboard.sidebar-collapsed {
  left: auto;
}
/* Dashboard Tab Toggle Button */
.dashboard-toggle-btn {
  display: none;
}
.dashboard-toggle-btn:hover {
  background: #ffffff;
  color: var(--accent-blue);
}
.dashboard-toggle-btn i {
  transition: transform 0.3s ease;
}
#dashboard.collapsed .dashboard-toggle-btn i {
  transform: rotate(180deg); /* point up when collapsed */
}
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  min-width: 0;
}
.dash-block {
  display: flex;
  flex-direction: column;
  gap: 6px;
  border-right: 1px solid rgba(15, 23, 42, 0.06);
  border-bottom: none;
  padding-right: 10px;
  padding-bottom: 0;
  min-width: 0;
}
.dash-block:last-child {
  border-right: none;
  padding-right: 0;
}
.dash-block h3 {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
}
.dash-block h3 i {
  color: var(--accent-blue);
}
.math-formula {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-primary);
  background: rgba(15, 23, 42, 0.02);
  padding: 5px 7px;
  border-radius: 6px;
  border: 1px solid rgba(15, 23, 42, 0.04);
  width: fit-content;
}
.math-substitution {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
}
.math-result {
  font-size: 0.85rem;
  font-weight: 500;
}
.highlight-val {
  color: var(--accent-blue);
  font-family: var(--font-mono);
  font-weight: 700;
}
/* Status block indicators */
.status-indicators {
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.status-indicator {
  display: flex;
  justify-content: space-between;
  font-size: 0.7rem;
}
.indicator-label {
  color: var(--text-secondary);
}
.indicator-value {
  font-weight: 700;
  letter-spacing: 0.5px;
  font-size: 0.68rem;
}
.indicator-value.type-real {
  color: var(--color-real);
  text-shadow: 0 0 4px var(--color-real-glow);
}
.indicator-value.type-virtual {
  color: var(--color-virtual);
  text-shadow: 0 0 4px var(--color-virtual-glow);
}
.indicator-value.type-none {
  color: var(--color-warning);
}
.status-note {
  font-size: 0.68rem;
  background: rgba(5, 150, 105, 0.06);
  border: 1px solid rgba(5, 150, 105, 0.15);
  color: var(--color-real);
  padding: 5px 7px;
  border-radius: 6px;
  margin-top: 4px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.status-note.blurred {
  background: rgba(217, 119, 6, 0.06);
  border-color: rgba(217, 119, 6, 0.15);
  color: var(--color-warning);
}
.status-note.hidden {
  display: none;
}
/* Educational Explanation panel at bottom */
#explanation-container {
  border-top: 1px solid rgba(15, 23, 42, 0.06);
  padding-top: 9px;
  margin-top: 4px;
}
.explanation-title {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--accent-blue);
  margin-bottom: 6px;
}
#explanation-text {
  font-size: 0.7rem;
  line-height: 1.35;
  color: var(--text-secondary);
}
#explanation-text strong {
  color: var(--text-primary);
}
/* Interaction drag pointer helper */
#interaction-tip {
  position: absolute;
  bottom: 25px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(15, 23, 42, 0.1);
  padding: 12px 34px 12px 16px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
  pointer-events: auto;
  animation: pulse-tip 2.5s infinite;
  box-shadow: 0 4px 15px rgba(15, 23, 42, 0.06);
}
#interaction-tip.hidden {
  display: none;
}
.interaction-tip-text {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.tip-dismiss-btn {
  position: absolute;
  top: 4px;
  right: 6px;
  width: 22px;
  height: 22px;
  border: 0;
  border-radius: 50%;
  background: rgba(15, 23, 42, 0.08);
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.75rem;
  transition: background var(--transition-speed), color var(--transition-speed);
}
.tip-dismiss-btn:hover {
  background: rgba(15, 23, 42, 0.14);
  color: var(--text-primary);
}
@keyframes pulse-tip {
  0% {
    opacity: 0.7;
    border-color: rgba(15, 23, 42, 0.1);
  }
  50% {
    opacity: 1;
    border-color: var(--accent-blue);
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.15);
  }
  100% {
    opacity: 0.7;
    border-color: rgba(15, 23, 42, 0.1);
  }
}
/* Layout scaling and Responsive Queries */
@media (max-width: 1024px) {
  #dashboard {
    left: auto;
    grid-template-columns: 1fr;
    height: auto;
    max-height: none;
    overflow: visible;
  }
  #dashboard.sidebar-collapsed {
    left: auto;
  }
  .control-panel {
    left: 20px;
    right: 60px;
    top: 20px;
    bottom: auto;
  }
  .panel-topbar {
    flex-wrap: wrap;
  }
  .panel-pagination {
    flex: 1 1 360px;
  }
  .panel-page[data-panel-page-content="parameters"].active,
  .panel-page[data-panel-page-content="legend"].active {
    grid-template-columns: 1fr;
  }
  .panel-page[data-panel-page-content="modes"] .panel-section {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .presets-grid,
  .dashboard-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 768px) {
  :root {
    --panel-left: 10px;
  }
  body {
    overflow: hidden; /* Prevent native page scrolling for app experience */
  }
  #app-container {
    flex-direction: row;
    height: 100%;
    width: 100%;
    overflow: hidden;
  }
  #canvas-container {
    position: absolute;
    height: 100%;
    width: 100%;
  }
  .app-header {
    min-width: 130px;
  }
  .control-panel {
    top: 10px;
    left: var(--panel-left);
    right: 50px;
    bottom: auto;
    width: auto;
    min-width: 0;
    max-width: none;
    padding: 10px;
    border-radius: 12px;
  }
  .panel-toggle-btn {
    position: fixed;
    top: 10px;
    right: 10px;
    left: auto;
    z-index: 30;
  }
  .panel-topbar {
    gap: 8px;
  }
  .panel-pagination {
    width: 100%;
    flex-basis: 100%;
  }
  .panel-page-btn {
    font-size: 0.62rem;
    padding: 6px 4px;
  }
  .control-panel.collapsed {
    transform: translateY(calc(-100% - 22px));
  }
  .panel-toggle-btn.panel-collapsed {
    position: fixed;
    left: auto;
    right: 10px;
    top: 10px;
    width: 32px;
    border-radius: 8px;
  }
  .panel-page[data-panel-page-content="modes"] .panel-section,
  .presets-grid,
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
  .panel-page[data-panel-page-content="parameters"] .control-group {
    flex-basis: 145px;
    min-width: 135px;
    max-width: 160px;
  }
  #ray-legend {
    width: auto;
    padding: 0;
  }
  .legend-item {
    gap: 8px;
  }
  .legend-text {
    font-size: 0.7rem;
  }
  #dashboard {
    left: auto !important;
    right: auto !important;
    bottom: auto;
    height: auto;
    padding: 0;
    border-radius: 0;
  }
  #dashboard.collapsed {
    transform: none;
  }
  .dashboard-grid {
    gap: 12px;
    max-height: none;
    overflow: visible;
    padding-right: 4px;
  }
  .dash-block {
    border-right: none;
    border-bottom: 1px solid rgba(15, 23, 42, 0.05);
    padding-right: 0;
    padding-bottom: 12px;
    gap: 6px;
  }
  .dash-block:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }
}