/**
 * Binary Orbits Sandbox - Styles
 * Dark theme styling for two-body orbital mechanics demo
 */

/* ============================================
   Layout
   ============================================ */
:root {
  --demo-max-width: 900px;
}

/* ============================================
   System Type Selector
   ============================================ */
.system-selector {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.system-selector label {
  font-weight: 500;
  color: var(--text-secondary);
}

.system-selector select {
  padding: 0.5rem 1rem;
  border-radius: 6px;
  background: var(--space-medium);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  min-height: 44px;
  cursor: pointer;
}

.system-selector select:hover {
  border-color: var(--cosmic-teal);
}

.system-selector select:focus {
  outline: 2px solid var(--cosmic-teal);
  outline-offset: 2px;
}

/* ============================================
   Visualization Panel
   ============================================ */
.viz-panel {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  margin-bottom: var(--space-md);
  overflow: hidden;
}

#orbit-svg {
  width: 100%;
  height: auto;
  display: block;
}

/* ============================================
   SVG Elements - Orbit Paths
   ============================================ */
.orbit-path {
  fill: none;
  stroke-width: 1.5;
  stroke-dasharray: 4 4;
  opacity: 0.6;
  transition: opacity var(--transition-fast);
}

.orbit-path:hover {
  opacity: 0.8;
}

/* Body 1 orbit (blue) */
#orbit-1 {
  stroke: #5dade2;
}

/* Body 2 orbit (red) */
#orbit-2 {
  stroke: #e74c3c;
}

/* ============================================
   SVG Elements - Bodies
   ============================================ */
.body {
  cursor: grab;
  transition: transform var(--transition-fast);
}

.body:hover {
  filter: brightness(1.1);
}

.body:active,
.body-draggable:active .body {
  cursor: grabbing;
}

.body-draggable {
  cursor: grab;
}

.body-draggable:active {
  cursor: grabbing;
}

.body-draggable:focus {
  outline: none;
}

.body-draggable:focus .body {
  stroke: var(--cosmic-teal);
  stroke-width: 2;
}

/* Body labels */
#body-1-label {
  fill: #5dade2;
  font-size: 12px;
}

#body-2-label {
  fill: #e74c3c;
  font-size: 12px;
}

/* ============================================
   SVG Elements - Barycenter
   ============================================ */
#barycenter {
  fill: #888;
  transition: all var(--transition-fast);
}

#barycenter-label {
  fill: var(--text-muted);
  font-size: 12px;
}

#barycenter-group {
  transition: opacity var(--transition-fast);
}

/* ============================================
   SVG Elements - Separation Line
   ============================================ */
#separation-line {
  stroke: var(--text-muted);
  stroke-width: 1;
  stroke-dasharray: 3 3;
  opacity: 0.5;
}

#separation-text {
  fill: var(--text-muted);
  font-size: 13px;
  font-weight: 600;
  paint-order: stroke;
  stroke: rgba(0, 0, 0, 0.85);
  stroke-width: 3px;
  stroke-linejoin: round;
}

/* ============================================
   SVG Elements - Vector Overlays
   ============================================ */
.vector-group line {
  stroke-width: 2;
  transition: opacity var(--transition-fast);
}

/* Velocity vectors (green) */
#v1-line,
#v2-line {
  stroke: #2ecc71;
}

/* Acceleration vectors (orange) */
#a1-line,
#a2-line {
  stroke: #f39c12;
}

/* Force vectors (red) */
#f1-line,
#f2-line {
  stroke: #e74c3c;
}

/* ============================================
   Mass Controls
   ============================================ */
.mass-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

/* ============================================
   Slider Groups (shared)
   ============================================ */
.slider-group {
  background: rgba(18, 18, 31, 0.7);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: 0.75rem 1rem;
}

.slider-group label {
  display: flex;
  justify-content: space-between;
  font-size: var(--font-size-sm);
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

.slider-group .value-display {
  color: var(--cosmic-teal);
  font-family: var(--font-mono);
}

.slider-group input[type="range"] {
  width: 100%;
}

.slider-group .scale-hint {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  text-align: right;
  margin-top: 0.25rem;
}

/* ============================================
   Orbital Controls
   ============================================ */
.orbital-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

/* ============================================
   View Controls
   ============================================ */
.view-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

/* ============================================
   Unit Selectors
   ============================================ */
.unit-selectors {
  display: flex;
  gap: 2rem;
  margin-bottom: var(--space-md);
  padding: 0.75rem 1rem;
  background: rgba(18, 18, 31, 0.7);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
}

.unit-select {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.unit-select label {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.unit-select select {
  padding: 0.25rem 0.5rem;
  border-radius: var(--border-radius-sm);
  background: var(--space-dark, var(--space-deep));
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  cursor: pointer;
}

.unit-select select:hover {
  border-color: var(--cosmic-teal);
}

.unit-select select:focus {
  outline: 2px solid var(--cosmic-teal);
  outline-offset: 2px;
}

/* ============================================
   Readout Panel
   ============================================ */
.readout-panel {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-bottom: var(--space-md);
}

.readout-item {
  background: rgba(18, 18, 31, 0.9);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: 0.75rem;
  text-align: center;
}

.readout-label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
  line-height: var(--line-height-tight);
}

.readout-value {
  font-size: var(--font-size-xl);
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--cosmic-teal);
  transition: color var(--transition-fast);
}

.readout-unit {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* Color-coded borders for body-specific readouts */
.readout-item.body-1 {
  border-left: 3px solid #5dade2;
}

.readout-item.body-2 {
  border-left: 3px solid #e74c3c;
}

.readout-item.barycenter-info {
  border-left: 3px solid #888;
  position: relative;
}

.readout-note {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-top: 0.15rem;
  font-style: italic;
}

.readout-note.inside-star {
  color: #f39c12;
}

.readout-note.outside-star {
  color: #27ae60;
}

/* ============================================
   Animation Controls
   ============================================ */
.animation-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: var(--space-md);
  padding: 0.75rem 1rem;
  background: rgba(18, 18, 31, 0.7);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
}

.anim-btn {
  padding: 0.5rem 1rem;
  border-radius: 6px;
  background: var(--space-medium);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  cursor: pointer;
  font-size: var(--font-size-sm);
  min-height: 44px;
  transition: all var(--transition-fast);
}

.anim-btn:hover {
  background: var(--space-light);
  border-color: var(--cosmic-teal);
}

.anim-btn:active {
  transform: scale(0.98);
}

.anim-btn.primary {
  background: var(--cosmic-teal);
  border-color: var(--cosmic-teal);
  color: var(--space-black);
}

.anim-btn.primary:hover {
  background: #6ad4cc;
  box-shadow: 0 0 15px rgba(78, 205, 196, 0.4);
}

.anim-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.anim-btn:focus-visible {
  outline: 2px solid var(--cosmic-teal);
  outline-offset: 2px;
}

.speed-control {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.speed-control label {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

.speed-control select {
  padding: 0.25rem 0.5rem;
  border-radius: var(--border-radius-sm);
  background: var(--space-dark, var(--space-deep));
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: var(--font-size-xs);
  cursor: pointer;
}

.speed-control select:hover {
  border-color: var(--cosmic-teal);
}

/* ============================================
   Presets Panel
   ============================================ */
.presets-panel {
  background: rgba(18, 18, 31, 0.7);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: 1rem;
  margin-bottom: var(--space-md);
}

.presets-section {
  margin-bottom: 0.75rem;
}

.presets-section:last-of-type {
  margin-bottom: 0;
}

.presets-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.presets-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.preset-btn {
  padding: 0.375rem 0.75rem;
  border-radius: var(--border-radius-sm);
  background: var(--space-medium);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: var(--font-size-xs);
  min-height: 36px;
  transition: all var(--transition-fast);
}

.preset-btn:hover {
  background: var(--space-light);
  color: var(--text-primary);
  border-color: var(--cosmic-teal);
}

.preset-btn:active {
  transform: scale(0.98);
}

.preset-btn.active {
  background: var(--cosmic-teal);
  border-color: var(--cosmic-teal);
  color: var(--space-black);
  font-weight: 600;
}

.preset-btn:focus-visible {
  outline: 2px solid var(--cosmic-teal);
  outline-offset: 2px;
}

/* ============================================
   Overlay Toggles
   ============================================ */
.overlays-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-color);
}

.overlay-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  cursor: pointer;
  transition: color var(--transition-fast);
}

.overlay-toggle:hover {
  color: var(--text-primary);
}

.overlay-toggle input {
  accent-color: var(--cosmic-teal);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.overlay-toggle input:focus-visible {
  outline: 2px solid var(--cosmic-teal);
  outline-offset: 2px;
}

/* ============================================
   Insight Box
   ============================================ */
.model-note {
  background: rgba(18, 18, 31, 0.9);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: 0.5rem 0.75rem;
  margin: 0.75rem 0 1rem 0;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
}

.model-note summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--text-secondary);
}

.model-note p {
  margin: 0.5rem 0 0 0;
  color: var(--text-muted);
}

.small-help {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

/* ============================================
   RV Overlay (RV curve + spectral inset)
   ============================================ */
.rv-controls {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0.75rem;
  align-items: end;
  margin-top: 0.75rem;
}

.rv-controls .overlay-toggle {
  margin-bottom: 0.25rem;
}

.rv-controls .unit-select select {
  width: 100%;
}

.rv-viz {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.rv-plot-card {
  background: rgba(18, 18, 31, 0.7);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: 0.6rem 0.6rem 0.75rem 0.6rem;
}

.rv-plot-title {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  font-weight: 600;
  margin-bottom: 0.35rem;
}

#rv-curve-svg,
#rv-line-svg {
  width: 100%;
  height: auto;
  background: rgba(0, 0, 0, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 10px;
}

.rv-inset-readouts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.25rem 0.75rem;
  margin-top: 0.5rem;
  font-family: var(--font-mono);
}

.rv-readout-title {
  grid-column: 1 / -1;
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--text-secondary);
}

.rv-readout-row {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

.rv-readout-label {
  color: var(--text-secondary);
}

.rv-readout-value {
  color: var(--text-primary);
}

.verify-badge {
  display: inline-block;
  padding: 0.1rem 0.35rem;
  border-radius: 999px;
  font-size: 0.75em;
  background: rgba(243, 156, 18, 0.16);
  border: 1px solid rgba(243, 156, 18, 0.45);
  color: #f39c12;
  vertical-align: middle;
}

.insight-box {
  background: rgba(18, 18, 31, 0.9);
  border-left: 3px solid var(--stellar-amber);
  padding: 1rem;
  border-radius: 0 var(--border-radius-md) var(--border-radius-md) 0;
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
  margin-bottom: var(--space-md);
}

.insight-box h4 {
  margin: 0 0 0.5rem 0;
  color: var(--stellar-amber);
  font-size: var(--font-size-sm);
}

.insight-box p {
  margin: 0.5rem 0;
  color: var(--text-secondary);
}

.insight-box em {
  color: var(--cosmic-teal);
  font-style: normal;
}

/* Formula styling for KaTeX */
.insight-box .formula {
  font-family: var(--font-mono);
  color: var(--cosmic-teal);
  margin: 0.5rem 0;
  padding: 0.5rem 0;
}

.insight-box .formula .katex {
  font-size: 1.1em;
  color: var(--cosmic-teal);
}

/* Dynamic insight text */
#insight-text {
  color: var(--text-muted);
  margin-top: 0.75rem;
  font-style: italic;
}

/* ============================================
   Screen Reader Only
   ============================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================
   Responsive - Tablet
   ============================================ */
@media (max-width: 700px) {
  .mass-controls,
  .orbital-controls,
  .view-controls {
    grid-template-columns: 1fr;
  }

  .readout-panel {
    grid-template-columns: repeat(2, 1fr);
  }

  .unit-selectors {
    flex-direction: column;
    gap: 0.75rem;
  }

  .animation-controls {
    flex-wrap: wrap;
  }

  .speed-control {
    margin-left: 0;
    width: 100%;
    justify-content: center;
    margin-top: 0.5rem;
  }

  .overlays-row {
    justify-content: center;
  }

  .presets-row {
    justify-content: center;
  }

  .rv-controls {
    grid-template-columns: 1fr;
  }

  .rv-viz {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   Responsive - Mobile
   ============================================ */
@media (max-width: 480px) {
  .readout-panel {
    grid-template-columns: 1fr;
  }

  .readout-item {
    text-align: left;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0.75rem;
  }

  .readout-item.body-1,
  .readout-item.body-2 {
    border-left-width: 3px;
  }

  .readout-label {
    margin-bottom: 0;
  }

  .readout-value {
    font-size: var(--font-size-lg);
  }

  .preset-btn {
    flex: 1 1 calc(50% - 0.25rem);
    text-align: center;
  }

  .anim-btn {
    flex: 1;
    text-align: center;
  }
}

/* ============================================
   Reduced Motion Support
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  .orbit-path,
  .body,
  .readout-value,
  .anim-btn,
  .preset-btn,
  .overlay-toggle,
  #barycenter-group {
    transition: none;
  }
}