:root {
  color-scheme: dark;
  /* Dark theme inspired by MuJoCo docs */
  --color-primary: #50a5ff;           /* general accent / links */
  --color-primary-strong: #3d94ff;    /* large titles / strong CTA */
  --color-primary-soft: #458dff;      /* subtle accents / hover on smaller UI */
  --color-primary-active: #458dff;    /* active / focus */
  --color-primary-contrast: #ffffff;
  --color-bg: #131416;                /* main background */
  --color-surface: rgba(26, 28, 30, 0.96); /* content surface */
  --color-panel: rgba(26, 28, 30, 0.9);    /* side panels */
  --color-panel-strong: rgba(26, 28, 30, 0.98);
  --color-border: rgba(129, 134, 141, 0.55);
  --color-border-strong: rgba(80, 165, 255, 0.65);
  --color-text: #cfd0d0;              /* primary text */
  --color-text-muted: #9ca0a5;        /* secondary text */
  --color-text-subtle: #81868d;       /* tertiary text */
  --color-overlay: rgba(19, 20, 22, 0.96);
  --color-overlay-soft: rgba(19, 20, 22, 0.6);
  --color-control-bg: rgba(15, 23, 42, 0.35);
  /* Font scaling */
  --viewer-font-scale: 1;
  --ui-panel-width: calc(264px * var(--viewer-font-scale));
  --ui-panel-track-width: var(--ui-panel-width);
  --ui-control-height: calc(28px * var(--viewer-font-scale));
  --ui-control-font-size: calc(12px * var(--viewer-font-scale));
  --ui-control-radius: calc(8px * var(--viewer-font-scale));
  --ui-pill-radius: calc(var(--ui-control-height) / 2);
  --ui-field-radius: var(--ui-control-radius);
  /* UI spacing tokens (Tight preset) */
  --ui-panel-padding-y: calc(10px * var(--viewer-font-scale));
  --ui-panel-padding-x: calc(6px * var(--viewer-font-scale));
  --ui-panel-padding-bottom: calc(48px * var(--viewer-font-scale));
  --ui-panel-gap: calc(4px * var(--viewer-font-scale));
  --ui-overlay-gap: calc(4px * var(--viewer-font-scale));
  --ui-overlay-padding: calc(6px * var(--viewer-font-scale));
  --ui-overlay-card-padding-y: calc(6px * var(--viewer-font-scale));
  --ui-overlay-card-padding-x: calc(6px * var(--viewer-font-scale));
  --ui-info-grid-gap: calc(2px * var(--viewer-font-scale)) calc(6px * var(--viewer-font-scale));
  --ui-help-grid-gap: calc(2px * var(--viewer-font-scale)) calc(6px * var(--viewer-font-scale));
  --ui-section-header-padding-y: calc(5px * var(--viewer-font-scale));
  --ui-section-header-padding-x: calc(6px * var(--viewer-font-scale));
  --ui-section-header-gap: calc(6px * var(--viewer-font-scale));
  --ui-section-body-gap: calc(4px * var(--viewer-font-scale));
  --ui-section-body-padding: calc(4px * var(--viewer-font-scale));
  --ui-control-row-gap: calc(3px * var(--viewer-font-scale)) calc(4px * var(--viewer-font-scale));
  --ui-control-row-full-gap: calc(4px * var(--viewer-font-scale));
  --ui-control-field-gap: calc(2px * var(--viewer-font-scale));
  --ui-action-row-gap: calc(4px * var(--viewer-font-scale));
  --ui-compact-pills-gap: calc(2px * var(--viewer-font-scale));
  --ui-segmented-gap: calc(2px * var(--viewer-font-scale));
  --ui-segmented-padding: calc(2px * var(--viewer-font-scale));
  --ui-pill-row-gap: calc(4px * var(--viewer-font-scale));
  --ui-equality-container-margin-top: calc(4px * var(--viewer-font-scale));
  --ui-equality-container-gap: calc(4px * var(--viewer-font-scale));
  --ui-run-toggle-margin-top: calc(2px * var(--viewer-font-scale));
  --ui-toast-offset-x: calc(16px * var(--viewer-font-scale));
  --ui-toast-offset-y: calc(16px * var(--viewer-font-scale));
  --ui-toast-padding-y: calc(8px * var(--viewer-font-scale));
  --ui-toast-padding-x: calc(12px * var(--viewer-font-scale));
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
body.theme-light,
html[data-play-theme="light"] body {
  --color-bg: #f8fafc;
  --color-surface: rgba(255, 255, 255, 0.95);
  --color-panel: rgba(255, 255, 255, 0.9);
  --color-panel-strong: rgba(255, 255, 255, 0.98);
  --color-text: #0f172a;
  --color-text-muted: #475569;
  --color-border: rgba(148, 163, 184, 0.45);
  --color-overlay: rgba(248, 250, 252, 0.96);
  --color-overlay-soft: rgba(248, 250, 252, 0.6);
  --color-control-bg: rgba(226, 232, 240, 0.88);
}
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  overflow: hidden;
  display: grid;
  grid-template-columns: var(--ui-panel-track-width) minmax(0, 1fr) var(--ui-panel-track-width);
  grid-template-rows: minmax(0, 1fr);
  height: 100vh;
  max-height: 100vh;
  min-height: 100vh;
  gap: 0;
  transition: background 0.3s ease;
}
html[data-play-embed="1"],
html[data-play-embed="1"] body {
  height: 100%;
  min-height: 100%;
}
html[data-play-embed="1"] body {
  height: 100%;
  min-height: 100%;
  max-height: none;
}
body.spacing-wide {
  --ui-panel-gap: calc(6px * var(--viewer-font-scale));
  --ui-overlay-gap: calc(6px * var(--viewer-font-scale));
  --ui-overlay-padding: calc(8px * var(--viewer-font-scale));
  --ui-overlay-card-padding-y: calc(8px * var(--viewer-font-scale));
  --ui-overlay-card-padding-x: calc(8px * var(--viewer-font-scale));
  --ui-info-grid-gap: calc(3px * var(--viewer-font-scale)) calc(8px * var(--viewer-font-scale));
  --ui-help-grid-gap: calc(3px * var(--viewer-font-scale)) calc(8px * var(--viewer-font-scale));
  --ui-section-header-padding-y: calc(7px * var(--viewer-font-scale));
  --ui-section-header-padding-x: calc(8px * var(--viewer-font-scale));
  --ui-section-header-gap: calc(8px * var(--viewer-font-scale));
  --ui-section-body-gap: calc(6px * var(--viewer-font-scale));
  --ui-section-body-padding: calc(6px * var(--viewer-font-scale));
  --ui-control-row-gap: calc(4px * var(--viewer-font-scale)) calc(6px * var(--viewer-font-scale));
  --ui-control-row-full-gap: calc(5px * var(--viewer-font-scale));
  --ui-control-field-gap: calc(3px * var(--viewer-font-scale));
  --ui-action-row-gap: calc(5px * var(--viewer-font-scale));
  --ui-compact-pills-gap: calc(3px * var(--viewer-font-scale));
  --ui-segmented-gap: calc(3px * var(--viewer-font-scale));
  --ui-segmented-padding: calc(3px * var(--viewer-font-scale));
  --ui-pill-row-gap: calc(5px * var(--viewer-font-scale));
  --ui-equality-container-gap: calc(6px * var(--viewer-font-scale));
}
body.fullscreen {
  background: #050608;
  height: 100vh;
  max-height: 100vh;
}
html[data-play-embed="1"] body.fullscreen {
  height: 100%;
  min-height: 100%;
  max-height: none;
}
@media (max-width: 1280px) {
  body {
    grid-template-columns: var(--ui-panel-track-width) minmax(0, 1fr);
  }
  .panel-right {
    display: none;
  }
}
@media (max-width: 960px) {
  body {
    grid-template-columns: minmax(0, 1fr);
  }
  .panel-left {
    display: none;
  }
  .section-body {
    grid-template-columns: minmax(0, 1fr);
  }
  .section-body > * {
    grid-column: span 1;
  }
  .control-row {
    grid-template-columns: minmax(0, 1fr);
  }
  .control-label {
    text-align: left;
    justify-self: start;
    padding-right: 0;
  }
}
  .panel {
    grid-row: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--ui-panel-padding-y) var(--ui-panel-padding-x) var(--ui-panel-padding-bottom);
    display: flex;
    flex-direction: column;
    gap: var(--ui-panel-gap);
    background: var(--color-bg);
  border-right: 1px solid var(--color-border);
  min-height: 0;
  min-width: 0;
  align-items: stretch;
}
.panel-left {
  grid-column: 1;
}
.panel-right {
  grid-column: 3;
  border-right: none;
  border-left: 1px solid var(--color-border);
}
.panel.is-hidden {
  display: none !important;
}
.panel-mount {
  display: contents;
}
.overlay-mount {
  display: contents;
}
.panel-left::-webkit-scrollbar, .panel-right::-webkit-scrollbar {
  width: 8px;
}
.panel-left::-webkit-scrollbar-thumb, .panel-right::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.35);
  border-radius: 999px;
}
.viewer {
  grid-row: 1;
  grid-column: 2;
  position: relative;
  overflow: hidden;
  background: radial-gradient(circle at 50% 25%, rgba(59, 130, 246, 0.22), rgba(15, 23, 42, 0.95));
  min-height: 0;
  min-width: 0;
  z-index: 0;
}
.viewer canvas[data-testid="viewer-canvas"] {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  background: #101424;
  z-index: 0;
}
.overlay-stack {
  position: absolute;
  inset: 0;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  gap: var(--ui-overlay-gap);
  align-items: flex-start;
  padding: var(--ui-overlay-padding);
}
.overlay-labels {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  pointer-events: none;
}
.overlay-card {
  position: relative;
  min-width: calc(220px * var(--viewer-font-scale));
  padding: var(--ui-overlay-card-padding-y) var(--ui-overlay-card-padding-x);
  background: var(--color-overlay);
  border-radius: calc(10px * var(--viewer-font-scale));
  font-size: calc(12px * var(--viewer-font-scale));
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.35);
  border: 1px solid var(--color-border);
  opacity: 0;
  transform: translateY(calc(-12px * var(--viewer-font-scale)));
  transition: opacity 0.18s ease, transform 0.18s ease;
}
.overlay-card[data-testid="overlay-help"],
.overlay-card[data-testid="overlay-info"] {
  background: var(--color-overlay-soft);
}
  .overlay-card[data-testid="overlay-realtime"] {
    position: absolute;
    top: calc(12px * var(--viewer-font-scale));
    right: calc(12px * var(--viewer-font-scale));
    min-width: calc(90px * var(--viewer-font-scale));
  }
  .overlay-card[data-testid="overlay-info"] {
    position: absolute;
    left: calc(12px * var(--viewer-font-scale));
    bottom: calc(12px * var(--viewer-font-scale));
    min-width: 0;
  width: calc(180px * var(--viewer-font-scale));
}
.info-grid {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--ui-info-grid-gap);
  font-size: calc(11px * var(--viewer-font-scale));
  min-width: 0;
}
.info-label {
  color: var(--color-text-muted);
}
.info-value {
  color: var(--color-text);
  text-align: right;
  font-variant-numeric: tabular-nums;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.info-value[data-info-field="model"] {
  text-align: left;
}
.overlay-card.visible {
  opacity: 1;
  transform: translateY(0);
}
.overlay-card .help-title {
  font-size: calc(12px * var(--viewer-font-scale));
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-text);
}
.overlay-card .help-subtitle {
  font-size: calc(11px * var(--viewer-font-scale));
  color: var(--color-text-muted);
  margin-bottom: 8px;
}
.overlay-card .help-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 2fr);
  gap: var(--ui-help-grid-gap);
  font-size: calc(11px * var(--viewer-font-scale));
}
.overlay-card .help-key {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  color: var(--color-text);
}
.overlay-card .help-desc {
  color: var(--color-text-muted);
}
.overlay-card .help-subtitle-unimplemented {
  margin-top: 10px;
  padding-top: 6px;
  border-top: 1px solid var(--color-border);
}
.ui-section {
  background: var(--color-panel-strong);
  border: 1px solid var(--color-border);
  border-radius: calc(8px * var(--viewer-font-scale));
  display: flex;
  flex-direction: column;
  overflow: hidden;
  flex: 0 0 auto;
}
.section-header {
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--ui-section-header-padding-y) var(--ui-section-header-padding-x);
  gap: var(--ui-section-header-gap);
  background: transparent;
}
.section-toggle {
  background: none;
  border: none;
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: calc(11px * var(--viewer-font-scale));
  font-weight: 600;
  cursor: pointer;
  padding: 0;
}
.section-actions {
  display: flex;
  align-items: center;
  gap: calc(6px * var(--viewer-font-scale));
}
.section-reset {
  background: none;
  border: none;
  color: var(--color-text-muted);
  font-size: calc(12px * var(--viewer-font-scale));
  cursor: not-allowed;
  opacity: 0.35;
}
.section-chevron {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: transform 0.2s ease;
}
.ui-section.is-collapsed .section-chevron {
  transform: rotate(-90deg);
}
.ui-section:not(.is-collapsed) .section-chevron {
  transform: rotate(90deg);
}
.ui-section.is-collapsed .section-body {
  display: none;
}
.section-body {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--ui-section-body-gap);
  padding: var(--ui-section-body-padding);
}
.section-body > * {
  grid-column: span 2;
}
.section-body > .full, .section-body > .control-static, .section-body > .control-separator, .section-body > .pill-row {
  grid-column: span 2;
}
.section-body > .bool-row {
  grid-column: span 1;
}
.section-body > .action-row {
  grid-column: span 1;
}
.section-body > .action-row.full {
  grid-column: span 2;
}
.control-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--ui-control-row-gap);
  align-items: center;
  width: 100%;
}
.control-row.full {
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ui-control-row-full-gap);
}
.control-label {
  font-size: calc(12px * var(--viewer-font-scale));
  font-weight: 500;
  color: var(--color-text-muted);
  text-align: right;
  justify-self: end;
  padding-right: 4px;
}
.control-row.full .control-label {
  text-align: left;
  justify-self: start;
  padding-right: 0;
}
.control-field {
  flex: 1 1 100%;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--ui-control-field-gap);
  width: 100%;
  max-width: 100%;
  min-width: 0;
}
.control-field.slider-field {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: calc(4px * var(--viewer-font-scale));
  flex-wrap: nowrap;
}
.control-field .static-value {
  margin-left: auto;
  font-variant-numeric: tabular-nums;
  font-size: calc(13px * var(--viewer-font-scale));
  color: var(--color-text);
  text-align: right;
  min-width: 0;
}
.control-field .static-value.is-muted {
  color: var(--color-text-muted);
}
.action-row {
  display: flex;
  align-items: stretch;
  gap: var(--ui-action-row-gap);
}
.action-row button {
  flex: 1 1 100%;
}
.compact-pills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--ui-compact-pills-gap);
  width: 100%;
  min-width: 0;
}
.compact-pill,
.btn-primary,
.btn-secondary,
.btn-pill,
.run-toggle,
.segmented-option span,
.bool-button,
.control-field select,
.control-field input[type="number"],
.control-field input[type="text"] {
  box-sizing: border-box;
  min-width: 0;
  max-width: 100%;
  min-height: var(--ui-control-height);
  font-size: var(--ui-control-font-size);
}
.compact-pill,
.btn-primary,
.btn-secondary,
.btn-pill,
.run-toggle,
.segmented-option span,
.bool-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: clip;
  padding: 0;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}
.compact-pill,
.btn-primary,
.btn-secondary,
.btn-pill,
.run-toggle {
  border-radius: var(--ui-pill-radius);
}
.compact-pill {
  border-color: var(--color-border);
  background: rgba(148, 163, 184, 0.08);
  color: var(--color-text);
}
.compact-pill.is-active,
.btn-pill.is-active {
  background: var(--color-primary);
  border-color: var(--color-border-strong);
  color: var(--color-primary-contrast);
}
.segmented {
  display: flex;
  align-items: stretch;
  width: 100%;
  min-width: 0;
  gap: var(--ui-segmented-gap);
  padding: var(--ui-segmented-padding);
  border-radius: calc(10px * var(--viewer-font-scale));
  border: 1px solid var(--color-border);
  background: rgba(255, 255, 255, 0.02);
  box-sizing: border-box;
}
.segmented-option {
  position: relative;
  display: flex;
  flex: 1 1 0;
  min-width: 0;
}
.segmented-option input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.segmented-option span {
  width: 100%;
  padding: 0;
  font-weight: 600;
  color: var(--color-text-muted);
  background: transparent;
  border-radius: var(--ui-control-radius);
}
.segmented-option input:checked + span {
  background: var(--color-primary);
  border-color: var(--color-border-strong);
  color: var(--color-primary-contrast);
}
.control-field select,
.control-field input[type="number"],
.control-field input[type="text"] {
  width: 100%;
  padding: 0 calc(8px * var(--viewer-font-scale));
  border: 1px solid var(--color-border);
  border-radius: var(--ui-control-radius);
  background: var(--color-control-bg);
  color: var(--color-text);
  line-height: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: clip;
}
.control-field select {
  appearance: auto;
  -webkit-appearance: menulist;
  -moz-appearance: auto;
  text-align-last: center;
}
.control-field input[type="number"],
.control-field input[type="text"] {
  text-align: center;
}
.control-field input.number-compact-center {
  padding: 0;
  text-align: center;
  /* Remove spinner chrome so centered numbers look truly centered. */
  appearance: textfield;
  -moz-appearance: textfield;
}
.control-field input.number-compact-center::-webkit-outer-spin-button,
.control-field input.number-compact-center::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.control-field select:focus,
.control-field select:active {
  color-scheme: light;
}
.control-field select option,
.control-field select optgroup {
  background: #f8fafc;
  color: #0f172a;
}
.control-field input[type="number"]::-webkit-inner-spin-button {
  height: 100%;
}
.control-field input:focus, .control-field select:focus {
  outline: none;
  border-color: var(--color-border-strong);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}
.control-field input.is-invalid {
  border-color: rgba(248, 113, 113, 0.65);
  background: rgba(248, 113, 113, 0.12);
  color: #fecaca;
}
.control-field input.is-invalid:focus {
  box-shadow: 0 0 0 2px rgba(248, 113, 113, 0.35);
  border-color: rgba(248, 113, 113, 0.85);
}
.control-field input[type="range"] {
  flex: 1;
  width: 100%;
  max-width: 100%;
  min-width: 0;
}
.control-field textarea {
  width: 100%;
  min-height: calc(96px * var(--viewer-font-scale));
  padding: calc(8px * var(--viewer-font-scale)) calc(10px * var(--viewer-font-scale));
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: var(--color-control-bg);
  color: var(--color-text);
  font-size: calc(12px * var(--viewer-font-scale));
  resize: vertical;
  box-sizing: border-box;
}
.control-field textarea.code-textarea {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: calc(11px * var(--viewer-font-scale));
}
.control-field textarea:focus {
  outline: none;
  border-color: var(--color-border-strong);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}
.control-field pre.codebox {
  margin: 0;
  padding: calc(8px * var(--viewer-font-scale)) calc(10px * var(--viewer-font-scale));
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: rgba(0, 0, 0, 0.22);
  color: var(--color-text);
  font-size: calc(11px * var(--viewer-font-scale));
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  white-space: pre-wrap;
  max-height: calc(240px * var(--viewer-font-scale));
  overflow: auto;
}
.slider-value {
  font-size: calc(11px * var(--viewer-font-scale));
  color: var(--color-text-muted);
  width: calc(28px * var(--viewer-font-scale));
  min-width: calc(28px * var(--viewer-font-scale));
  max-width: calc(28px * var(--viewer-font-scale));
  text-align: right;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: clip;
}
.bool-row {
  display: flex;
  width: 100%;
  gap: var(--ui-action-row-gap);
}
.bool-label {
  position: relative;
  width: 100%;
}
.bool-label input[type='checkbox'] {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}
.bool-label .bool-text {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-width: 0;
  min-height: 100%;
  text-align: center;
  line-height: 1;
  pointer-events: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: clip;
}
.bool-button {
  flex: 1 1 100%;
  width: 100%;
  padding: 0 calc(8px * var(--viewer-font-scale));
  border-radius: calc(10px * var(--viewer-font-scale));
  border-color: var(--color-border);
  background: rgba(148, 163, 184, 0.12);
  color: var(--color-text);
  font-weight: 500;
}
.bool-button.is-active {
  background: var(--color-primary);
  border-color: var(--color-border-strong);
  color: var(--color-primary-contrast);
}
.bool-button.is-disabled {
  background: #b0b0b0;
  border-color: #9ca3af;
  color: #000000;
  cursor: default;
  opacity: 1;
}
.bool-button:not(.is-disabled):focus-visible,
.bool-button.has-focus {
  outline: none;
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.25);
}
.btn-primary,
.btn-secondary,
.btn-pill {
  font-weight: 600;
}
.btn-file {
  position: relative;
  overflow: hidden;
  width: 100%;
}
.btn-file input[type="file"] {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.001;
  cursor: pointer;
}
.btn-primary {
  background: var(--color-primary);
  color: var(--color-primary-contrast);
}
.btn-primary:hover {
  background: var(--color-primary-strong);
}
.btn-secondary {
  background: rgba(148, 163, 184, 0.12);
  border-color: var(--color-border);
  color: var(--color-text);
}
.btn-pill {
  background: rgba(59, 130, 246, 0.12);
  border-color: rgba(59, 130, 246, 0.35);
  color: var(--color-primary);
}
.btn-secondary:hover {
  background: rgba(148, 163, 184, 0.2);
  border-color: var(--color-border-strong);
}
.btn-pill:hover {
  background: rgba(59, 130, 246, 0.18);
  border-color: var(--color-border-strong);
}
.btn-primary:hover,
.btn-secondary:hover,
.btn-pill:hover,
.run-toggle:hover,
.bool-button:not(.is-disabled):hover,
.compact-pill:hover {
  box-shadow: 0 0 0 1px rgba(148, 163, 184, 0.55);
  transform: translateY(-0.5px);
}
.run-toggle-row {
  margin-top: var(--ui-run-toggle-margin-top);
}
.run-toggle {
  width: 100%;
  border-color: var(--color-border);
  background: rgba(59, 130, 246, 0.12);
  color: var(--color-text);
  font-weight: 600;
}
.run-toggle.is-active {
  background: var(--color-primary);
  border-color: var(--color-border-strong);
  color: var(--color-primary-contrast);
}
.run-toggle:not(.is-active) {
  color: var(--color-text);
  background: rgba(59, 130, 246, 0.08);
}
.pill-row {
  display: flex;
  gap: var(--ui-pill-row-gap);
}
  .pill-row .btn-pill {
    flex: 1 1 100%;
  }
.equality-toggle-container {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--ui-equality-container-gap);
  margin-top: var(--ui-equality-container-margin-top);
}
.control-static {
  font-size: calc(12px * var(--viewer-font-scale));
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 4px 0;
}
.control-separator {
  font-size: calc(11px * var(--viewer-font-scale));
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 4px;
}
  .toast {
    position: absolute;
    right: 24px;
    bottom: 24px;
    padding: 12px 18px;
    background: var(--color-panel-strong);
    border-radius: 12px;
    border: 1px solid var(--color-border);
    color: var(--color-text);
    font-size: calc(13px * var(--viewer-font-scale));
    max-width: min(320px, 45%);
    white-space: pre-line;
    word-break: break-word;
    overflow-wrap: anywhere;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.2s ease, transform 0.2s ease;
    pointer-events: none;
    backdrop-filter: blur(10px);
    z-index: 5;
  }
.toast.visible {
  opacity: 1;
  transform: translateY(0);
}
/* Clean grid layout via template areas */
.viewer {
  grid-area: main;
}
.panel-left {
  grid-area: left;
}
.panel-right {
  grid-area: right;
}
body.layout-3col {
  grid-template-areas: "left main right";
  grid-template-columns: var(--ui-panel-track-width) minmax(0, 1fr) var(--ui-panel-track-width);
  grid-template-rows: minmax(0, 1fr);
}
body.layout-left {
  grid-template-areas: "left main";
  grid-template-columns: var(--ui-panel-track-width) minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr);
}
body.layout-right {
  grid-template-areas: "main right";
  grid-template-columns: minmax(0, 1fr) var(--ui-panel-track-width);
  grid-template-rows: minmax(0, 1fr);
}
body.layout-main {
  grid-template-areas: "main";
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr);
}