.sim-section {
  --sim-com: #0a8fb8;
  --sim-com-combined: #72bce8;
  width: calc(100% - 300px);
  max-width: 1200px;
  margin: 0 var(--page-gutter) 0 auto;
  padding: 60px 0 72px;
  border-top: 1px solid var(--line);
  scroll-margin-top: 85px;
}
.sim-section h2 {
  font: 500 clamp(34px, 4vw, 58px)/1.05 var(--serif);
  margin: 12px 0 16px;
}
.sim-intro {
  color: var(--muted);
  max-width: 780px;
  margin-bottom: 30px;
  line-height: 1.65;
}
.sim-panels {
  scroll-margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  align-items: start;
}
.sim-panel {
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: var(--paper);
  min-width: 0;
}
.sim-panel-heading {
  padding: 12px 14px 10px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}
.sim-title {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 5px 9px;
}
.sim-panel h3 {
  margin: 0;
  font: 500 25px/1.1 var(--serif);
}
.sim-teacher {
  margin: 0;
  color: var(--muted);
  font: 10px var(--mono);
}
.sim-policy-picker { display: flex; align-items: center; gap: 12px; margin: 12px 14px 8px; font-size: 14px; }
.sim-policy-picker select { min-width: 0; flex: 1; }
.sim-policy-note { margin: 0 14px 12px; font-size: 13px; color: var(--muted); line-height: 1.5; }
.sim-section button,
.sim-section select {
  font: 500 11px/1.35 var(--sans);
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 5px 8px;
  cursor: pointer;
  min-height: 29px;
  max-width: 100%;
}
.sim-section button:hover:not(:disabled),
.sim-section button[aria-pressed="true"] {
  border-color: var(--flame);
  color: var(--flame);
  background: var(--surface-raised);
}
.sim-section button:focus-visible,
.sim-section select:focus-visible {
  outline: 2px solid var(--flame);
  outline-offset: 3px;
}
.sim-section button:disabled,
.sim-section select:disabled {
  opacity: 0.4;
  cursor: default;
}
.sim-section .sim-load {
  background: var(--flame);
  color: var(--on-flame);
  border-color: var(--flame);
}
.sim-controls {
  padding: 0 14px 10px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.sim-controls fieldset {
  padding: 0;
  margin: 0;
  border: 0;
  display: flex;
  gap: 5px;
  flex-wrap: wrap;
  min-width: 0;
}
.sim-controls legend {
  padding: 0;
  margin: 0 0 4px;
  font: 10px/1.5 var(--mono);
  color: var(--muted);
}
.sim-tabs {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 4px;
  padding: 3px;
  border-radius: 7px;
  background: var(--surface);
}
.sim-tabs button {
  border-color: transparent;
  background: transparent;
  padding: 4px;
  font-size: 12px;
}
.sim-tabs button[aria-selected="true"] {
  color: var(--flame);
  background: var(--paper);
  border-color: var(--line);
}
.sim-tab-content {
  min-height: 108px;
}
.sim-tab-panel {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 2px;
}
.sim-tab-panel[hidden] {
  display: none;
}
.sim-controls .sim-movement {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.sim-movement legend {
  grid-column: 1 / -1;
}
.sim-controls .sim-grasp-options {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 4px;
}
.sim-grasp-options legend {
  grid-column: 1 / -1;
}
.sim-grasp-options button {
  padding-left: 3px;
  padding-right: 3px;
  white-space: nowrap;
}
.sim-controls .sim-restore {
  border-top: 1px solid var(--line);
  padding-top: 7px;
}
.sim-restore legend {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
}
.sim-restore button {
  flex: 1;
}
.sim-select-label {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font: 11px var(--mono);
  color: var(--muted);
}
.sim-scene {
  position: relative;
  width: 100%;
  height: clamp(260px, calc(100svh - 330px), 350px);
  background: var(--surface);
  overflow: hidden;
  border-top: 1px solid var(--line);
}
.sim-scene canvas {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}
.sim-placeholder {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding: 30px;
  text-align: center;
  color: var(--muted);
  box-sizing: border-box;
}
.sim-placeholder[hidden] {
  display: none;
}
.sim-placeholder svg {
  width: 100px;
  height: 130px;
  margin-bottom: 20px;
  opacity: 0.6;
  stroke: var(--flame);
}
.sim-placeholder p {
  font: 13px/1.6 var(--sans);
  max-width: 290px;
}
.sim-legend {
  display: flex;
  align-items: center;
  gap: 4px 12px;
  flex-wrap: wrap;
  padding: 7px 14px;
  color: var(--muted);
  font: 10px/1.4 var(--sans);
}
.sim-legend .sim-com::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--sim-com);
  margin-right: 5px;
}
.sim-legend .sim-com-combined::before {
  background: var(--sim-com-combined);
}
.sim-status {
  font: 500 11px/1.5 var(--sans);
  margin: 0 14px 6px;
}
.sim-status[hidden] {
  display: none;
}
.sim-help {
  margin-top: 12px;
  font: 11px/1.6 var(--sans);
  color: var(--muted);
}
.sim-help summary {
  cursor: pointer;
}
.sim-footnote {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.7;
  margin-top: 20px;
  max-width: 1100px;
}
@media (min-width: 1740px) {
  .sim-section {
    margin-right: calc((100vw - 1620px) / 2);
  }
}
@media (max-width: 1100px) {
  .sim-section {
    width: auto;
    margin: 0 var(--page-gutter);
  }
}
@media (max-width: 900px) {
  .sim-panels {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .sim-section {
    padding: 40px 0;
  }
}
@media (max-width: 480px) {
  .sim-title {
    gap: 5px;
  }
  .sim-panel h3 {
    font-size: 23px;
  }
  .sim-scene {
    height: clamp(250px, calc(100svh - 320px), 330px);
  }
}

/* Keyboard instructions belong to the page, outside the simulation canvases. */
.sim-keyboard-help {
  margin: 0 0 24px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
}
.sim-keyboard-heading {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  font: 600 13px/1.4 var(--sans);
}
.sim-keyboard-heading > span {
  color: var(--muted);
  font: 10px var(--mono);
}
.sim-keyboard-map {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 16px 0 12px;
}
.sim-keyboard-map > div {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}
.sim-keyboard-map dt {
  display: flex;
  gap: 5px;
}
.sim-keyboard-map dd {
  margin: 0;
  color: var(--muted);
  font: 11px/1.4 var(--sans);
}
.sim-keyboard-map kbd {
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 29px;
  border: 1px solid var(--line);
  border-bottom-width: 3px;
  border-radius: 5px;
  background: var(--paper);
  color: var(--ink);
  font: 500 12px var(--mono);
}
.sim-keyboard-map kbd.is-pressed {
  border-color: var(--flame);
  background: var(--flame);
  color: var(--on-flame);
}
.sim-keyboard-help p {
  margin: 0;
  color: var(--muted);
  font: 12px/1.6 var(--sans);
}
.sim-keyboard-help .sim-pointer-tip {
  margin-top: 4px;
  font-size: 11px;
}
.sim-panel[data-keyboard-active="true"] {
  border-color: var(--flame);
  box-shadow: 0 0 0 1px var(--flame);
}
.sim-scene:focus-visible {
  outline: 2px solid var(--flame);
  outline-offset: -3px;
}
@media (max-width: 520px) {
  .sim-keyboard-help {
    padding: 16px;
  }
  .sim-keyboard-map {
    gap: 10px;
  }
  .sim-keyboard-map > div {
    align-items: flex-start;
    flex-direction: column;
  }
}