:root[data-visual-style="steampunk"] {
  --bg: #211a15;
  --panel: #2b221b;
  --panel-raised: #34291f;
  --line: #64503a;
  --line-strong: #7b6144;
  --muted: #c9b79e;
  --ink: #f4e9d6;
  --brand: #a8723b;
  --accent: #e2b56b;
  --accent-hover: #f0cc91;
  --cyan: #e2b56b;
  --gold: #e9c486;
  --rose: #e39076;
}
.visual-style-control {
  position: relative;
  flex-shrink: 0;
  display: flex;
  align-items: end;
  gap: 12px;
}
.animation-control {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 30px;
  font-size: 12px;
  cursor: pointer;
  white-space: nowrap;
}
.animation-control input {
  accent-color: var(--accent);
  width: 15px;
  height: 15px;
  margin: 0;
}
.animation-control input:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}
.style-switch {
  border: 0;
  padding: 0;
  margin: 0;
  display: flex;
  gap: 2px;
}
.style-switch legend {
  font-size: 10px;
  color: var(--muted);
  margin-bottom: 4px;
}
.style-switch label {
  position: relative;
  cursor: pointer;
}
.style-switch input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}
.style-switch span {
  display: block;
  padding: 6px 9px;
  border: 1px solid var(--line);
  border-radius: 3px;
  font-size: 12px;
}
.style-switch input:checked + span {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
  font-weight: 650;
}
.style-switch input:focus-visible + span {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}
.style-feedback {
  position: absolute;
  z-index: 20;
  right: 0;
  top: 100%;
  max-width: 280px;
  min-width: 190px;
  font-size: 11px;
  color: var(--ink);
  background: var(--panel);
}
.style-feedback:has(#style-status:not(:empty)) {
  border: 1px solid var(--line);
  padding: 8px;
}
.style-feedback button {
  margin-top: 6px;
}
:root[data-visual-style="steampunk"] button,
:root[data-visual-style="steampunk"] input,
:root[data-visual-style="steampunk"] select,
:root[data-visual-style="steampunk"] textarea {
  background-color: #34291f;
  border-color: var(--line);
  color: var(--ink);
}
:root[data-visual-style="steampunk"] button:hover {
  background-color: #493825;
  border-color: var(--accent);
}
:root[data-visual-style="steampunk"] button.primary {
  background: var(--accent);
  color: #211a15;
}
:root[data-visual-style="steampunk"] button.primary:hover {
  background: #f0cc91;
}
@media (max-width: 1100px) {
  .masthead {
    flex-wrap: wrap;
    height: auto !important;
    min-height: 78px;
    gap: 12px !important;
    padding-top: 12px !important;
    padding-bottom: 12px !important;
  }
  .visual-style-control {
    margin-left: auto;
  }
}
@media (max-width: 460px) {
  .masthead nav {
    order: 3;
    width: 100%;
  }
  .style-switch span {
    padding: 6px;
    font-size: 11px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .style-switch span {
    transition: none;
  }
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  font-size: 13px;
}
button,
input,
select,
textarea {
  font: inherit;
}
button {
  cursor: pointer;
  background: var(--panel-raised);
  color: var(--ink);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 8px 11px;
  white-space: nowrap;
  transition:
    background 0.15s,
    border-color 0.15s;
}
button:hover {
  background: #352743;
  border-color: var(--accent);
}
button:disabled {
  opacity: 0.4;
  cursor: wait;
}
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}
button.primary {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
  font-weight: 650;
}
button.primary:hover {
  background: var(--accent-hover);
}
a {
  color: inherit;
  text-decoration: none;
}
a:hover {
  color: var(--accent);
}
.masthead {
  height: 78px;
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  gap: 25px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 650;
  letter-spacing: -0.7px;
  font-size: 24px;
  flex-shrink: 0;
}
.brand-logo {
  width: 48px;
  height: 48px;
  border-radius: 7px;
  background: white;
}
.brand-sub {
  display: block;
  color: var(--muted);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.2px;
  margin-top: 2px;
}
nav {
  display: flex;
  align-items: center;
  gap: 30px;
  height: 100%;
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
}
.nav-active {
  color: var(--ink);
  height: 100%;
  display: flex;
  align-items: center;
  border-bottom: 2px solid var(--accent);
}
.connection {
  font: 9px var(--mono);
  letter-spacing: 1px;
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--accent);
}
.connection i,
.live-dot {
  display: inline-block;
  width: 5px;
  height: 5px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 12px #7ef5df70;
}
.live-dot {
  margin-right: 9px;
}
main {
  display: flex;
  min-height: calc(100vh - 111px);
}
.controls {
  flex: 0 0 272px;
  padding: 26px 21px 20px;
  background: var(--panel);
  border-right: 1px solid var(--line);
}
.section-number,
.eyebrow {
  font: 9px var(--mono);
  letter-spacing: 1.5px;
  color: var(--muted);
}
.section-number {
  color: var(--gold);
}
h1 {
  font-size: 44px;
  line-height: 0.99;
  letter-spacing: -2px;
  font-weight: 450;
  margin: 19px 0 13px;
}
.intro {
  color: #aebccc;
  font-size: 12px;
  line-height: 1.7;
  margin: 0 0 24px;
}
.field {
  display: block;
  position: relative;
  font-size: 10px;
  color: var(--muted);
  margin-bottom: 12px;
}
.field > input,
.field > select,
.field > textarea {
  display: block;
  margin-top: 7px;
}
.field input,
.field select,
select,
textarea,
input[type="number"] {
  min-width: 0;
  width: 100%;
  background: var(--field);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--ink);
  padding: 8px 9px;
  font: 11px var(--mono);
}
.rock-range {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-top: 7px;
}
.rock-range input[type="range"] {
  flex: 1;
  min-width: 0;
  width: auto;
  height: 18px;
  margin: 0;
  padding: 0;
  accent-color: var(--accent);
  background: transparent;
  border: 0;
  cursor: ew-resize;
}
.rock-range output {
  min-width: 42px;
  color: var(--ink);
  font: 12px var(--mono);
  text-align: right;
}
.rock-range-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 3px;
  color: #718096;
  font: 8px var(--mono);
}
select {
  cursor: pointer;
}
.scenario-description {
  font-size: 11px;
  line-height: 1.6;
  color: var(--muted);
  min-height: 33px;
}
.run-controls {
  display: flex;
  gap: 5px;
  margin: 19px 0 27px;
}
.run-controls button {
  font-size: 11px;
  padding: 9px 8px;
}
.run-controls .primary {
  flex: 1;
}
.control-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font: 10px var(--mono);
  letter-spacing: 1px;
  color: #c0ccd8;
  margin: 19px 0 14px;
}
.control-heading span {
  font-size: 8px;
  color: #718096;
  letter-spacing: 0.5px;
}
.fields-two {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 10px;
}
.fields-two button {
  margin-bottom: 10px;
}
.fields-two input {
  width: 100%;
}
details {
  border-bottom: 1px solid var(--line);
  padding: 2px 0 14px;
  margin-bottom: 23px;
}
summary {
  cursor: pointer;
  font-size: 10px;
  color: var(--muted);
  padding: 4px 0 12px;
}
details .field {
  margin-bottom: 9px;
}
.check {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 12px 0;
  color: #b5c1ce;
  font-size: 11px;
  white-space: nowrap;
}
.check input {
  accent-color: var(--accent);
  width: 12px;
  height: 12px;
  margin: 0;
}
#flight-controls {
  margin: 2px 0 4px;
}
.flight-toggle {
  width: 100%;
  margin: 8px 0;
}
.flight-toggle span {
  margin-right: auto;
}
.flight-toggle output {
  color: var(--gold);
  font: 9px var(--mono);
  letter-spacing: 0.8px;
}
.flight-toggle[data-mode="off"] output {
  color: #718096;
}
.flight-toggle[data-mode="auto"] output {
  color: var(--muted);
}

/* Shared help treatment used by the arcade and the laboratory. The icon is
   keyboard-focusable and the tooltip can be pinned with a click or tap. */
.help-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 15px;
  height: 15px;
  margin-left: 5px;
  padding: 0;
  vertical-align: middle;
  background: var(--field);
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 50%;
  font-size: 10px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0;
  text-transform: none;
  cursor: help;
  flex-shrink: 0;
}
.help-icon:hover,
.help-icon:focus-visible {
  color: var(--ink);
  border-color: var(--accent);
  outline: none;
}
.check .help-icon,
.control-heading .help-icon,
.style-switch .help-icon {
  margin-left: 6px;
}
#tooltip {
  position: fixed;
  z-index: 1000;
  max-width: min(320px, calc(100vw - 16px));
  padding: 8px 11px;
  background: var(--panel);
  border: 1px solid var(--accent);
  border-radius: 6px;
  color: var(--ink);
  font-size: 12px;
  line-height: 1.45;
  text-transform: none;
  letter-spacing: normal;
  font-weight: normal;
  box-shadow: 0 6px 20px #0009;
  pointer-events: none;
}
#tooltip.pinned {
  pointer-events: auto;
}
#tooltip[hidden] {
  display: none;
}
#tooltip p {
  margin: 0;
}
#tooltip p + p {
  margin-top: 6px;
}
.swatch {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  margin-left: auto;
}
.checkpoint-readout {
  position: absolute;
  transform: translateX(-50%);
  pointer-events: none;
  padding: 4px 8px;
  border: 1px solid #ffce7080;
  border-radius: 5px;
  background: #15121bea;
  color: #ffce70;
  font: 11px var(--mono);
  white-space: nowrap;
  z-index: 2;
}
.formation-legend {
  display: grid;
  gap: 5px;
  margin: 0 0 14px 23px;
  color: var(--muted);
  font: 10px var(--mono);
}
.formation-legend[hidden] {
  display: none;
}
.formation-quality-ramp {
  display: block;
  height: 5px;
  border-radius: 3px;
}
.green {
  background: #7bffc1;
}
.cyan {
  background: #6ffff1;
}
.rose {
  background: #ff538b;
}
.violet {
  background: #9f82ff;
}
.gold {
  background: #ffce70;
}
.controls-footer {
  border-top: 1px solid var(--line);
  margin-top: 25px;
  padding-top: 17px;
  display: flex;
  flex-direction: column;
  gap: 7px;
  font: 8px var(--mono);
  letter-spacing: 1px;
  color: #77899e;
}
.controls-footer span:first-child {
  color: var(--accent);
}
.stage {
  min-width: 0;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.stage-toolbar {
  height: 52px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 22px;
  border-bottom: 1px solid var(--line);
  font: 10px var(--mono);
  letter-spacing: 0.4px;
}
.stage-toolbar > div {
  display: flex;
  align-items: center;
}
.tag {
  font: 8px var(--mono);
  border: 1px solid #354253;
  color: var(--muted);
  padding: 3px 5px;
  margin-left: 12px;
}
.view-buttons {
  gap: 5px;
  flex-wrap: wrap;
  min-width: 0;
}
.view-buttons button {
  padding: 5px 8px;
  font-size: 9px;
  background: transparent;
}
#viewport {
  position: relative;
  flex: 1;
  min-height: 470px;
  overflow: hidden;
  background: #090d16;
}
#world {
  display: block;
  width: 100%;
  height: 100%;
  position: absolute;
  inset: 0;
}
.viewport-label {
  position: absolute;
  top: 25px;
  left: 26px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}
.viewport-label .eyebrow {
  font-size: 8px;
  color: #7c91a9;
}
.viewport-label strong {
  font-size: 24px;
  letter-spacing: 2px;
  font-weight: 350;
  color: #c5d6e5;
}
.viewport-label > span:last-child {
  font: 9px var(--mono);
  color: #8093a8;
}
.compass {
  position: absolute;
  bottom: 53px;
  left: 30px;
  font: 8px var(--mono);
  color: #8aa4ba;
  width: 40px;
  height: 35px;
  border-bottom: 1px solid #587186;
  border-left: 1px solid #587186;
}
.compass span:first-child {
  position: absolute;
  top: -14px;
  left: -3px;
}
.compass span:last-child {
  position: absolute;
  right: -10px;
  bottom: -4px;
}
.legend {
  display: flex;
  position: absolute;
  right: 25px;
  bottom: 25px;
  gap: 20px;
  font: 9px var(--mono);
  color: #a3b6c7;
  pointer-events: none;
}
.legend span {
  display: flex;
  align-items: center;
  gap: 6px;
}
.legend i {
  width: 5px;
  height: 5px;
  display: inline-block;
  border-radius: 50%;
}
.viewport-hint {
  position: absolute;
  bottom: 13px;
  left: 26px;
  font: 7px var(--mono);
  letter-spacing: 1px;
  color: #657c93;
  pointer-events: none;
}
#status {
  pointer-events: none;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  max-width: 75%;
  background: #0d1828ed;
  border: 1px solid #3d6073;
  padding: 16px 22px;
  font: 11px/1.7 var(--mono);
  text-align: center;
  box-shadow: 0 10px 80px #0008;
}
#status:empty {
  display: none;
}
#status.error {
  border-color: var(--rose);
  color: #ffacc6;
}
.telemetry {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #101723;
  padding: 20px 8px 19px;
}
.telemetry > div {
  padding: 0 15px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-right: 1px solid var(--line);
}
.telemetry > div:last-child {
  border: 0;
}
.telemetry span {
  font: 8px var(--mono);
  letter-spacing: 0.5px;
  color: var(--muted);
  white-space: nowrap;
}
.telemetry strong {
  font: 26px var(--mono);
  letter-spacing: -1px;
  color: #d6e5ef;
  font-weight: 400;
}
.telemetry strong small {
  font-size: 13px;
  color: var(--muted);
}
.telemetry > div:nth-child(3) strong {
  color: var(--gold);
}
.telemetry > div:last-child strong {
  color: var(--accent);
}
.telemetry em {
  font: 7px var(--mono);
  letter-spacing: 0.3px;
  color: #7a8ea6;
  font-style: normal;
  white-space: nowrap;
}
.history-bar {
  display: flex;
  align-items: center;
  gap: 13px;
  padding: 19px 22px 12px;
}
.history-bar > div {
  margin-right: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 10px;
  color: #a9b8c8;
}
.history-bar > label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 10px;
  color: var(--muted);
  margin: 0;
}
.history-bar select {
  width: 80px;
  font-size: 10px;
  padding: 6px;
}
.history-bar button,
.replay-bar button {
  font-size: 10px;
  padding: 6px 9px;
}
.replay-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 5px 22px 22px;
}
.replay-bar > input {
  flex: 1;
  min-width: 40px;
  accent-color: var(--accent);
  height: 3px;
}
.replay-bar label {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 10px;
  color: var(--muted);
}
.replay-bar label input {
  width: 75px;
  padding: 5px;
  font-size: 10px;
}
.editor {
  width: 300px;
  flex-shrink: 0;
  background: var(--panel);
  border-left: 1px solid var(--line);
  padding: 10px 18px 22px;
}
.editor[hidden] {
  display: none;
}
.editor > p {
  font-size: 11px;
  line-height: 1.7;
  color: var(--muted);
}
.editor > button {
  width: 100%;
  margin-bottom: 12px;
  font-size: 11px;
}
.editor .control-heading button {
  border: 0;
  background: none;
  font-size: 20px;
}
.editor textarea {
  width: 100%;
  resize: vertical;
  font: 10px/1.6 var(--mono);
}
.editor #selection-name {
  color: var(--accent);
}
footer {
  height: 33px;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 23px;
  font: 7px var(--mono);
  letter-spacing: 1px;
  color: #78899e;
}
dialog {
  width: min(780px, 90vw);
  background: var(--panel);
  border: 1px solid #506176;
  color: var(--ink);
  border-radius: 4px;
  padding: 18px 25px;
}
dialog::backdrop {
  background: #020610c9;
}
dialog textarea {
  width: 100%;
  height: 65vh;
  font: 12px/1.6 var(--mono);
  resize: vertical;
}
dialog .control-heading {
  margin-top: 0;
}
#json-error {
  color: var(--rose);
  font: 11px var(--mono);
}
.editing #world {
  cursor: crosshair;
}
.editing .viewport-label {
  opacity: 0.5;
}
@media (min-width: 1600px) {
  .controls {
    flex-basis: 290px;
    padding-left: 28px;
    padding-right: 28px;
  }
  .telemetry {
    padding: 24px 14px;
  }
  .telemetry > div {
    padding: 0 22px;
  }
  #viewport {
    min-height: 570px;
  }
}
@media (max-width: 1200px) {
  .controls {
    flex-basis: 235px;
    padding: 22px 16px;
  }
  h1 {
    font-size: 40px;
  }
  .connection {
    font-size: 8px;
  }
  .masthead {
    padding: 0 20px;
  }
  .telemetry {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px 0;
  }
  .telemetry > div:nth-child(3) {
    border: 0;
  }
  .telemetry strong {
    font-size: 23px;
  }
  .history-bar {
    flex-wrap: wrap;
    gap: 9px;
  }
  .history-bar > div {
    min-width: 180px;
  }
  .history-bar .check {
    display: none;
  }
  .stage-toolbar {
    padding: 0 15px;
  }
  .tag {
    display: none;
  }
  .editor {
    position: absolute;
    right: 0;
    top: 78px;
    bottom: 33px;
    overflow: auto;
    box-shadow: -20px 0 70px #0009;
    z-index: 5;
  }
}
@media (max-width: 780px) {
  .masthead {
    height: 63px;
    padding: 0 12px;
    gap: 12px;
  }
  .brand {
    font-size: 13px;
  }
  .brand-sub {
    font-size: 6px;
  }
  nav {
    gap: 12px;
    font-size: 10px;
  }
  nav .engine-notes,
  .nav-active,
  .connection {
    display: none;
  }
  main {
    display: block;
  }
  .controls {
    border-right: 0;
    padding: 18px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px 20px;
  }
  .controls h1 {
    font-size: 29px;
    margin: 0;
    grid-row: 1/3;
    grid-column: 1;
  }
  .controls h1 br {
    display: none;
  }
  .section-number {
    grid-column: 2;
    grid-row: 1;
  }
  .intro,
  .scenario-description,
  .controls .control-heading,
  .controls details,
  .controls .check,
  .controls-footer {
    display: none;
  }
  .controls #problem-settings,
  .controls #reward-settings {
    display: block;
    grid-column: 1/-1;
    min-width: 0;
  }
  #problem-settings .scenario-description {
    display: block;
  }
  #reward-settings .scenario-description {
    display: block;
  }
  .controls > .field {
    margin: 0;
  }
  .controls .keyboard-toggle {
    display: flex;
    grid-column: 1/-1;
  }
  .controls #flight-controls {
    display: block;
    grid-column: 1/-1;
  }
  .controls #flight-controls .check {
    display: flex;
    grid-column: 1/-1;
  }
  .controls .keyboard-hint {
    grid-column: 1/-1;
  }
  .controls > .fields-two {
    grid-column: 1/-1;
    grid-template-columns: repeat(4, 1fr);
  }
  .run-controls {
    margin: 0;
    grid-column: 1;
    grid-row: 3;
  }
  .controls > .field:has(#clock) {
    grid-column: 2;
    grid-row: 3;
  }
  .controls > .field:has(#scenario) {
    grid-column: 2;
    grid-row: 2;
  }
  .stage-toolbar {
    height: auto;
    min-height: 46px;
    padding-top: 8px;
    padding-bottom: 8px;
  }
  .stage-toolbar > div:first-child {
    font-size: 8px;
  }
  .view-buttons button {
    font-size: 8px;
    padding: 5px;
  }
  .viewport-label strong {
    font-size: 19px;
  }
  #viewport {
    min-height: 440px;
  }
  .legend {
    right: 15px;
    bottom: 25px;
    gap: 10px;
    font-size: 7px;
  }
  .history-bar,
  .replay-bar {
    padding-left: 15px;
    padding-right: 15px;
  }
  .replay-bar {
    flex-wrap: wrap;
  }
  .replay-bar > input {
    min-width: 100%;
    margin: 10px 0 17px;
  }
  .telemetry em {
    font-size: 6px;
  }
  .telemetry span {
    font-size: 7px;
  }
  .telemetry > div {
    padding: 0 10px;
  }
  .editor {
    position: fixed;
    top: 63px;
    bottom: 0;
  }
  footer span:last-child {
    display: none;
  }
  footer {
    font-size: 6px;
  }
  .viewport-label > span:last-child {
    font-size: 7px;
  }
}

.motion-panel {
  padding: 15px 22px;
  border-top: 1px solid #243846;
  border-bottom: 1px solid #243846;
  background: #0d1b27;
}
.motion-heading {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 11px;
  font-size: 10px;
  color: #94acbb;
}
#motion-position {
  margin-left: auto;
  font-variant-numeric: tabular-nums;
}
.motion-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}
.motion-controls button,
.motion-controls select {
  font-size: 10px;
  padding: 7px 9px;
}
#motion-play {
  border-color: #4c8b8c;
  color: var(--accent);
  min-width: 102px;
}
#motion-speed {
  width: 58px;
}
#motion-timeline {
  min-width: 40px;
  flex: 1;
  accent-color: var(--accent);
}
@media (max-width: 850px) {
  .motion-panel {
    padding: 12px 15px;
  }
  .motion-controls {
    flex-wrap: wrap;
  }
  #motion-timeline {
    flex-basis: calc(100% - 190px);
  }
  #motion-segment {
    display: none;
  }
}

.wide-dialog {
  width: min(1180px, 95vw);
  max-height: 92vh;
  overflow: auto;
}
.dialog-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.dialog-heading h2 {
  font-size: 24px;
  margin: 0;
}
.experiment-fields {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 20px 0;
}
.experiment-fields label {
  display: block;
  position: relative;
  color: #a8c0ce;
  font-size: 12px;
}
.experiment-fields label > input,
.experiment-fields label > select {
  display: block;
  margin-top: 7px;
}
.button-row {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  margin: 14px 0;
}
.button-row input[type="range"] {
  flex: 1;
}
.table-scroll {
  overflow-x: auto;
}
.table-scroll table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}
.table-scroll th,
.table-scroll td {
  text-align: left;
  padding: 12px 10px;
  border-bottom: 1px solid #28404d;
}
#comparison-worlds {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
#comparison-worlds h3 {
  font-size: 13px;
  font-weight: 400;
  color: var(--accent);
}
.comparison-world {
  height: 340px;
  position: relative;
}
.comparison-world canvas {
  width: 100%;
  height: 100%;
  display: block;
}
#batch-profile {
  line-height: 1.8;
  color: #90ced0;
}
@media (max-width: 800px) {
  .experiment-fields {
    grid-template-columns: 1fr 1fr;
  }
  #comparison-worlds {
    grid-template-columns: 1fr;
  }
}
.storage-controls {
  grid-column: 1/-1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  background: #0c1521;
  border-top: 1px solid #263b4a;
  font-size: 11px;
}
.storage-controls input:not([type="checkbox"]) {
  max-width: 150px;
}
.storage-controls output {
  color: #83b4c3;
  font-family: monospace;
}
.storage-controls output:last-child {
  flex-basis: 100%;
}
.stored-run {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid #283c4d;
}
.stored-run span {
  flex: 1;
}
.property-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.property-grid input {
  width: 100%;
  min-width: 0;
}
.channel-control {
  display: grid;
  grid-template-columns: 1fr 45px;
  gap: 8px;
  font-size: 11px;
  padding: 8px 0;
}
.channel-control input {
  grid-column: 1/-1;
  width: 100%;
}
#storage-dialog {
  max-width: 850px;
  width: 90vw;
}
#physics-readout {
  white-space: pre-wrap;
}

.editor {
  max-height: calc(100vh - 111px);
  overflow-y: auto;
}

.wide-dialog .fields-two textarea {
  height: 64px;
  min-height: 64px;
  width: 100%;
  resize: vertical;
  font: 11px/1.4 var(--mono);
}

.keyboard-hint {
  display: none;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.5;
  margin: 2px 0 12px;
}
.keyboard-toggle:has(input:checked) + .keyboard-hint {
  display: block;
}

/* Preview the active scene's physical road boundaries. */
#track-control[hidden] { display: none; }
.circuit-preview {
  margin: 12px 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--bg);
}
.circuit-preview[hidden] { display: none; }
.circuit-preview svg { display: block; width: 100%; height: 125px; }
.circuit-preview svg path { fill: var(--accent); stroke: var(--muted); }
.circuit-preview svg .circuit-start { fill: var(--gold); stroke: var(--bg); stroke-width: 0.3; }
.circuit-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; margin-top: 8px; }
.circuit-heading strong { font-size: 13px; line-height: 1.4; }
.circuit-difficulty { color: var(--gold); font: 11px var(--mono); }
.circuit-difficulty[data-difficulty="easy"] { color: var(--cyan); }
.circuit-difficulty[data-difficulty="hard"] { color: var(--rose); }
.circuit-preview p, .circuit-preview a { font-size: 11px; line-height: 1.5; }
.circuit-preview p { color: var(--muted); margin: 6px 0; }
.circuit-preview a { color: var(--accent); }
@media (max-width: 780px) {
  #track-control { grid-column: 1 / -1; }
  .circuit-preview { grid-column: 1 / -1; margin: 0; }
  .circuit-preview:not([hidden]) + .scenario-description {
    display: block;
    grid-column: 1 / -1;
    margin: 0;
  }
}

#cargo-status { position: absolute; bottom: 3.2rem; left: 1rem; z-index: 3; padding: .45rem .7rem; background: #111a25e8; color: #f1d8a1; border: 1px solid #86734c; font: 12px monospace; pointer-events: none; }

#problem-settings,
#reward-settings { grid-column: 1 / -1; }
#problem-settings[hidden] { display: none !important; }
.action-type-settings {
  min-width: 0;
  margin: 0 0 12px;
  padding: 10px 10px 2px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #0b121d80;
}
.action-type-settings legend {
  padding: 0 5px;
  color: var(--ink);
  font: 10px var(--mono);
  letter-spacing: .5px;
  text-transform: uppercase;
}
.action-multiplier-field { margin-bottom: 10px; }
.action-multiplier-inputs {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-top: 6px;
}
.action-multiplier-inputs input[type="range"] {
  flex: 1;
  min-width: 0;
  width: auto;
  height: 18px;
  margin: 0;
  padding: 0;
  accent-color: var(--gold);
  background: transparent;
  border: 0;
  cursor: ew-resize;
}
.action-multiplier-inputs output {
  min-width: 35px;
  color: var(--ink);
  font: 11px var(--mono);
  text-align: right;
}
#agent-action-settings + button { width: 100%; }
#problem-settings .scenario-description { margin-top: 12px; }
.reward-inputs { display: grid; grid-template-columns: minmax(0, 1fr) 5.5rem; gap: .6rem; align-items: center; }
.reward-inputs input { min-width: 0; width: 100%; }
#reward-terms > button { margin: .3rem .3rem .3rem 0; }
.reward-field { position: relative; }
.reward-field > .help-icon { position: absolute; top: 0; right: 0; }

/* Camera gestures are available outside the scene editor. */
body:not(.editing) #world { cursor: grab; }
body #world.panning, body #world.rotating { cursor: grabbing; }
#world { touch-action: none; }
.camera-hint {
  position: absolute;
  bottom: 38px;
  left: 26px;
  color: #b8c4d8;
  font-size: 12px;
  pointer-events: none;
}

.editing .camera-hint { display: none; }

/* Navigation gizmo: orientation widget with zoom and pan drag handles. */
.view-gizmo {
  --axis-x: #e5484d;
  --axis-y: #5bb974;
  --axis-z: #4c8dff;
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 4;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}
.view-gizmo-orbit {
  width: 88px;
  height: 88px;
  overflow: visible;
  border-radius: 50%;
  cursor: grab;
  touch-action: none;
}
.view-gizmo.dragging,
.view-gizmo.dragging * { cursor: grabbing; }
.view-gizmo-disc {
  fill: color-mix(in srgb, var(--ink) 14%, transparent);
  opacity: 0;
  transition: opacity 0.12s;
}
.view-gizmo-orbit:hover .view-gizmo-disc,
.view-gizmo-orbit:focus-visible .view-gizmo-disc,
.view-gizmo.dragging .view-gizmo-disc { opacity: 1; }
.view-gizmo-orbit:focus { outline: none; }
.view-gizmo-orbit:focus-visible .view-gizmo-disc {
  stroke: var(--accent);
  stroke-width: 1.5;
}
.view-gizmo-axis { cursor: pointer; }
.view-gizmo-axis.axis-x { --axis: var(--axis-x); }
.view-gizmo-axis.axis-y { --axis: var(--axis-y); }
.view-gizmo-axis.axis-z { --axis: var(--axis-z); }
.view-gizmo-axis line {
  stroke: var(--axis);
  stroke-width: 2.5;
  stroke-linecap: round;
  pointer-events: none;
}
.view-gizmo-axis circle {
  fill: var(--axis);
  stroke: var(--axis);
  stroke-width: 1.5;
}
.view-gizmo-axis.negative circle {
  fill: color-mix(in srgb, var(--axis) 35%, #0c1422);
}
.view-gizmo-axis text {
  fill: #0b0f16;
  font: 700 10px var(--mono);
  text-anchor: middle;
  pointer-events: none;
}
.view-gizmo-axis.negative text {
  display: none;
  fill: #fff;
  font-size: 7px;
}
.view-gizmo-axis:not(.disabled):hover circle {
  stroke: #fff;
  filter: brightness(1.15);
}
.view-gizmo-axis.negative:not(.disabled):hover text { display: inline; }
.view-gizmo-axis.disabled { cursor: inherit; }
.view-gizmo-button {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: color-mix(in srgb, var(--panel) 90%, transparent);
  color: var(--ink);
  cursor: grab;
  touch-action: none;
}
.view-gizmo-button:hover { border-color: var(--line-strong); }
.view-gizmo-button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}
.view-gizmo-button svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  pointer-events: none;
}

.action-guide-readout {
  position: absolute;
  left: 16px;
  bottom: 36px;
  max-width: calc(100% - 32px);
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: color-mix(in srgb, var(--panel) 90%, transparent);
  color: var(--ink);
  font-family: ui-monospace, monospace;
  font-size: 11px;
  line-height: 1.5;
  white-space: pre-line;
  pointer-events: none;
  z-index: 5;
}
.action-guide-readout[hidden] { display: none; }