/**
 * Physics Animations — shared sim shell
 * C: Mobile canvas-first order
 * A: Loading / CDN / WebGL error overlay styles
 */

/* —— C: canvas before controls on narrow viewports —— */
@media (max-width: 1023px) {
  .sim-shell {
    display: grid;
  }

  .sim-shell > .sim-controls {
    order: 2;
  }

  .sim-shell > .sim-viewport {
    order: 1;
  }

  /*
   * Fallback for pages not yet tagged with sim-*: when the first grid child
   * is the controls column (lg:col-span-4 / aside) and a later sibling is the
   * viewport (lg:col-span-8 / #three-container ancestor), swap visual order.
   */
  .grid.lg\:grid-cols-12 > .sim-controls,
  .grid.lg\:grid-cols-3 > .sim-controls {
    order: 2;
  }

  .grid.lg\:grid-cols-12 > .sim-viewport,
  .grid.lg\:grid-cols-3 > .sim-viewport,
  .grid.lg\:grid-cols-2 > .sim-viewport {
    order: 1;
  }
}

/* —— A: GL overlay —— */
.physics-gl-overlay {
  position: absolute;
  inset: 0;
  z-index: 20;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #f1f5f9;
  border-radius: inherit;
  text-align: center;
  padding: 1.25rem;
  box-sizing: border-box;
}

.physics-gl-overlay[hidden],
.physics-gl-overlay.is-hidden {
  display: none !important;
}

.physics-gl-overlay .pgl-dots {
  display: flex;
  gap: 0.25rem;
  justify-content: center;
  margin-bottom: 1rem;
}

.physics-gl-overlay .pgl-dot {
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 9999px;
  background: #60a5fa;
  animation: pgl-bounce 0.9s infinite ease-in-out;
}

.physics-gl-overlay .pgl-dot:nth-child(2) {
  background: #3b82f6;
  animation-delay: 0.15s;
}

.physics-gl-overlay .pgl-dot:nth-child(3) {
  background: #2563eb;
  animation-delay: 0.3s;
}

@keyframes pgl-bounce {
  0%, 80%, 100% { transform: translateY(0); opacity: 0.55; }
  40% { transform: translateY(-6px); opacity: 1; }
}

.physics-gl-overlay .pgl-loading-text,
.physics-gl-overlay .pgl-error-msg {
  color: #334155;
  font-size: 0.875rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  line-height: 1.4;
}

.physics-gl-overlay .pgl-error-icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
  line-height: 1;
}

.physics-gl-overlay .pgl-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin-top: 0.75rem;
}

.physics-gl-overlay .pgl-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.5rem 1rem;
  border-radius: 0.75rem;
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: transform 0.15s ease, background 0.15s ease;
}

.physics-gl-overlay .pgl-btn:hover {
  transform: translateY(-1px);
}

.physics-gl-overlay .pgl-btn-primary {
  background: #2563eb;
  color: #fff;
}

.physics-gl-overlay .pgl-btn-primary:hover {
  background: #1d4ed8;
}

.physics-gl-overlay .pgl-btn-link {
  background: transparent;
  color: #2563eb;
  text-decoration: underline;
  min-height: auto;
  padding: 0.25rem 0.5rem;
}

.physics-gl-overlay .pgl-error {
  display: none;
}

.physics-gl-overlay.is-error .pgl-loading,
.physics-gl-overlay.is-error #loadingState {
  display: none;
}

.physics-gl-overlay.is-error .pgl-error,
.physics-gl-overlay.is-error #errorState {
  display: block;
}

.physics-gl-overlay #errorState.hidden {
  display: none !important;
}

@media (prefers-reduced-motion: reduce) {
  .physics-gl-overlay .pgl-dot {
    animation: none;
    opacity: 0.85;
  }
}

/* Ensure overlay hosts are positioning contexts */
#three-container,
#canvas-container,
[data-gl-host],
.sim-viewport {
  position: relative;
}

/* —— E: mode tip + locked controls —— */
.sim-mode-tip {
  font-size: 0.75rem;
  line-height: 1.35;
  color: #1d4ed8;
  background: #eff6ff;
  border: 1px solid #dbeafe;
  border-radius: 0.5rem;
  padding: 0.5rem 0.75rem;
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sim-mode-tip.is-empty,
.sim-mode-tip[hidden] {
  display: none !important;
}

.sim-control-block {
  position: relative;
}

.sim-control-block.sim-control--locked {
  opacity: 0.55;
}

.sim-control-block.sim-control--locked input[type="range"],
.sim-control-block.sim-control--locked input:not([type]),
.sim-control-block.sim-control--locked select {
  cursor: not-allowed;
}

.sim-lock-reason {
  margin: 0.25rem 0 0;
  font-size: 0.7rem;
  line-height: 1.3;
  color: #64748b;
}

.sim-lock-reason[hidden] {
  display: none !important;
}

@media (prefers-reduced-motion: reduce) {
  .sim-control-block.sim-control--locked input {
    transition: none;
  }
}

/* —— D: index sticky catalog chips —— */
.catalog-sticky {
  position: sticky;
  top: 0;
  z-index: 40;
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
  padding: 0.65rem 0;
  background: linear-gradient(180deg, rgba(248, 250, 252, 0.96) 0%, rgba(248, 250, 252, 0.92) 70%, rgba(248, 250, 252, 0.75) 100%);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.9);
}

.catalog-sticky-inner {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.catalog-chips {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  padding-bottom: 0.15rem;
  overscroll-behavior-x: contain;
}

.catalog-chip {
  flex: 0 0 auto;
  min-height: 40px;
  padding: 0.4rem 0.85rem;
  border-radius: 9999px;
  border: 1px solid #cbd5e1;
  background: #fff;
  color: #334155;
  font-size: 0.8125rem;
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.catalog-chip:hover {
  border-color: #93c5fd;
  color: #1d4ed8;
}

.catalog-chip.is-active {
  background: #2563eb;
  border-color: #2563eb;
  color: #fff;
}

.catalog-filter {
  width: 100%;
  min-height: 44px;
  border-radius: 0.75rem;
  border: 1px solid #cbd5e1;
  background: #fff;
  padding: 0.55rem 0.85rem;
  font-size: 0.875rem;
  color: #0f172a;
}

.catalog-filter:focus {
  outline: 2px solid #93c5fd;
  outline-offset: 1px;
  border-color: #60a5fa;
}

.catalog-empty {
  margin-top: 0.75rem;
  margin-bottom: 0.25rem;
  padding: 0.35rem 0;
  text-align: left;
  color: #64748b;
  font-size: 0.875rem;
  line-height: 1.4;
  background: transparent;
  border: none;
  border-radius: 0;
  min-height: 1.4em;
}

.catalog-empty[hidden],
a.group.is-filtered-out,
[id].is-filtered-out {
  display: none !important;
}

@media (min-width: 768px) {
  .catalog-sticky-inner {
    flex-direction: row;
    align-items: center;
  }

  .catalog-chips {
    flex: 1 1 auto;
    min-width: 0;
  }

  .catalog-filter {
    flex: 0 0 240px;
    width: 240px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .catalog-chip {
    transition: none;
  }
}