/* ==========================================================================
   PHYSICS LABORATORY SANDBOX STYLING (SECTOR 07 - ADAPTIVE)
   ========================================================================== */

.lab-sandbox-container {
  background: var(--space-surface);
  border: 1px solid var(--space-surface-border);
  border-radius: 12px;
  backdrop-filter: blur(16px);
  overflow: hidden;
  box-shadow: var(--box-shadow-panel);
}

.lab-mode-tabs {
  display: flex;
  background: var(--space-dark);
  border-bottom: 1px solid var(--space-surface-border);
  padding: 8px 16px;
  gap: 8px;
}

.lab-tab-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.lab-tab-btn:hover {
  color: var(--text-main);
  background: rgba(2, 132, 199, 0.08);
}

.lab-tab-btn.active {
  color: var(--cyan-beam);
  background: rgba(2, 132, 199, 0.12);
  border-color: var(--cyan-beam);
}

.lab-interactive-stage {
  display: grid;
  grid-template-columns: 1fr 340px;
  min-height: 460px;
}

.lab-canvas-viewport {
  position: relative;
  background: radial-gradient(circle at center, rgba(15, 23, 42, 0.9) 0%, rgba(2, 4, 9, 0.98) 100%);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

[data-theme="light"] .lab-canvas-viewport {
  background: radial-gradient(circle at center, #1e293b 0%, #0f172a 100%);
}

.lab-canvas-viewport canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.viewport-instructions-overlay {
  position: absolute;
  bottom: 12px;
  left: 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--cyan-beam);
  background: rgba(3, 6, 15, 0.85);
  padding: 4px 10px;
  border-radius: 4px;
  pointer-events: none;
  border: 1px solid rgba(0, 242, 254, 0.25);
}

/* Sidebar Controls */
.lab-controls-sidebar {
  background: var(--space-surface);
  border-left: 1px solid var(--space-surface-border);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  overflow-y: auto;
}

.control-block-title {
  font-family: var(--font-mono);
  font-size: clamp(0.65rem, 3vw, 0.78rem);
  letter-spacing: 0.06em;
  color: var(--cyan-beam);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
}

.control-slider-group {
  margin-bottom: 12px;
}

.slider-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.slider-name {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 500;
}

.slider-readout {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-main);
  font-weight: 700;
}

.sim-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 5px;
  background: var(--space-surface-border);
  border-radius: 3px;
  outline: none;
}

.sim-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--cyan-beam);
  cursor: pointer;
}

/* Observer Switch Toggle */
.observer-toggle-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(0, 0, 0, 0.1);
  padding: 12px 14px;
  border-radius: 6px;
  border: 1px solid var(--space-surface-border);
}

[data-theme="light"] .observer-toggle-container {
  background: rgba(241, 245, 249, 0.7);
}

.switch-label-text {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-main);
  font-weight: 600;
}

.switch-subtext {
  font-size: 0.68rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider-round {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: #64748b;
  transition: .3s;
  border-radius: 24px;
}

.slider-round:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .3s;
  border-radius: 50%;
}

input:checked + .slider-round {
  background-color: #ff0055;
  box-shadow: 0 0 10px #ff0055;
}

input:checked + .slider-round:before {
  transform: translateX(20px);
}

.lab-btn-row {
  display: flex;
  gap: 8px;
}

.btn-lab-action {
  flex: 1;
  padding: 9px;
  background: var(--space-surface);
  border: 1px solid var(--space-surface-border);
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-lab-action:hover {
  background: rgba(2, 132, 199, 0.12);
  border-color: var(--cyan-beam);
  color: var(--cyan-beam);
}

/* Physics formulas callout */
.lab-physics-callout {
  background: rgba(0, 0, 0, 0.1);
  border-left: 3px solid var(--cyan-beam);
  padding: 10px 12px;
  border-radius: 0 4px 4px 0;
}

[data-theme="light"] .lab-physics-callout {
  background: rgba(241, 245, 249, 0.8);
}

.callout-eq {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--cyan-beam);
  margin-bottom: 4px;
  font-weight: 700;
}

.callout-explain {
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.45;
}

@media (max-width: 900px) {
  .lab-interactive-stage {
    grid-template-columns: 1fr;
  }
  .lab-controls-sidebar {
    border-left: none;
    border-top: 1px solid var(--space-surface-border);
  }
}