html, body {
  margin: 0;
  padding: 0;
  background: white;
}
canvas {
  display: block;
}

.scene-search-palette {
  position: fixed;
  inset: 0;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding: 10vh 16px 24px;
  background: transparent;
  z-index: 2000;
}

.scene-search-palette.is-open {
  display: flex;
}

.scene-search-panel {
  width: min(640px, 100%);
  border-radius: 12px;
  overflow: hidden;
  background: rgba(22, 22, 22, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.45);
}

.scene-search-input {
  width: 100%;
  border: 0;
  outline: 0;
  padding: 14px 16px;
  font-size: 16px;
  line-height: 1.4;
  color: #f5f5f5;
  background: rgba(255, 255, 255, 0.08);
}

.scene-search-input::placeholder {
  color: rgba(255, 255, 255, 0.65);
}

.scene-search-results {
  margin: 0;
  padding: 8px;
  list-style: none;
  max-height: min(52vh, 460px);
  overflow: auto;
}

.scene-search-item {
  width: 100%;
  text-align: left;
  border: 0;
  border-radius: 8px;
  padding: 10px 12px;
  margin: 0;
  color: #f5f5f5;
  background: transparent;
  cursor: pointer;
  font-size: 14px;
}

.scene-search-item:hover,
.scene-search-item.is-selected {
  background: rgba(255, 255, 255, 0.16);
}

.scene-search-results.keyboard-navigating .scene-search-item:hover:not(.is-selected) {
  background: transparent;
}

.scene-search-empty {
  padding: 10px 12px;
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
}

.frame-rate-control {
  position: fixed;
  top: 12px;
  right: 12px;
  z-index: 1900;
  display: none;
  align-items: center;
  gap: 10px;
  width: min(320px, calc(100vw - 24px));
  padding: 10px 12px;
  box-sizing: border-box;
  border-radius: 8px;
  background: rgba(22, 22, 22, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.14);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.34);
  color: #f5f5f5;
  font-family: monospace;
  font-size: 12px;
}

.frame-rate-control.is-open {
  display: flex;
}

.frame-rate-control-label {
  flex: 0 0 auto;
}

.frame-rate-control-value {
  flex: 0 0 48px;
  text-align: right;
  color: rgba(255, 255, 255, 0.76);
}

.frame-rate-control-slider {
  flex: 1 1 auto;
  min-width: 96px;
}

.help-overlay {
  position: fixed;
  inset: 0;
  z-index: 2100;
  display: none;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  padding: 20px;
  background: rgba(0, 0, 0, 0.32);
  color: #f5f5f5;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.help-overlay.is-open {
  display: flex;
}

.help-panel {
  width: 980px;
  max-width: 100%;
  min-width: 0;
  max-height: 86vh;
  display: flex;
  flex-direction: column;
  box-sizing: border-box;
  overflow: hidden;
  border-radius: 8px;
  background: rgba(18, 18, 18, 0.96);
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.48);
}

.help-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.06);
}

.help-header h2 {
  margin: 0;
  font-size: 16px;
  line-height: 1.25;
  font-weight: 700;
}

.help-close-button {
  flex: 0 0 auto;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 6px;
  padding: 7px 10px;
  color: #f5f5f5;
  background: rgba(255, 255, 255, 0.08);
  font: inherit;
  font-size: 12px;
  cursor: pointer;
}

.help-close-button:hover,
.help-close-button:focus-visible {
  background: rgba(255, 255, 255, 0.16);
  outline: none;
}

.help-content {
  min-width: 0;
  overflow: auto;
  padding: 12px 16px 16px;
}

.help-section {
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
  overflow-x: auto;
  padding: 8px 0 12px;
}

.help-section + .help-section {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.help-section h3 {
  margin: 0 0 10px;
  color: rgba(255, 255, 255, 0.86);
  font-size: 12px;
  line-height: 1.3;
  text-transform: uppercase;
  font-weight: 700;
}

.help-state-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 8px 14px;
  margin: 0;
}

.help-state-list dt {
  color: rgba(255, 255, 255, 0.58);
  font-size: 11px;
}

.help-state-list dd {
  margin: 2px 0 0;
  color: #f5f5f5;
  font-size: 13px;
  line-height: 1.35;
}

.help-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: 12px;
  line-height: 1.35;
}

.help-table th,
.help-table td {
  padding: 7px 8px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.help-table th {
  position: sticky;
  top: 0;
  z-index: 1;
  color: rgba(255, 255, 255, 0.68);
  background: rgba(18, 18, 18, 0.98);
  font-weight: 700;
}

.help-table td:first-child,
.help-table th:first-child {
  white-space: nowrap;
}

@media (max-width: 640px) {
  .help-overlay {
    align-items: stretch;
    padding: 10px;
  }

  .help-panel {
    width: 100%;
    max-height: calc(100vh - 20px);
  }

  .help-header {
    padding: 12px;
  }

  .help-content {
    padding: 10px 12px 14px;
  }
}