.sim-container {
  margin: 1.5rem 0;
}
#sim-canvas,
#hist-canvas {
  box-sizing: border-box;
  width: 100%;
  max-width: 720px;
  display: block;
  border: 1px solid #ddd;
  border-radius: 4px;
}
#sim-canvas {
  aspect-ratio: 4 / 3;
  height: auto;
  background: #080a14;
}
#hist-canvas {
  height: 220px;
  background: #0b0d14;
}
.sim-controls {
  margin-top: 0.6rem;
  display: flex;
  gap: 0.5rem;
  align-items: center;
  font-family: var(--sans, sans-serif);
  font-size: 0.9rem;
}
.sim-controls button {
  padding: 0.3rem 0.8rem;
  border: 1px solid #ccc;
  background: #f7f7f7;
  border-radius: 3px;
  cursor: pointer;
  font-family: inherit;
}
.sim-controls button:hover { background: #eee; }
.sim-fps { color: var(--muted, #666); margin-left: auto; }
.sim-speed {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--muted, #666);
}
.sim-speed input[type="range"] {
  width: 160px;
  vertical-align: middle;
}
.sim-speed span {
  min-width: 2.6rem;
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.sim-param {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--muted, #666);
}
.sim-param select {
  font: inherit;
  padding: 0.15rem 0.3rem;
}
.sim-error {
  margin-top: 0.6rem;
  padding: 0.6rem 0.8rem;
  background: #fff4f4;
  border-left: 3px solid #a00;
  font-size: 0.9rem;
}
.sim-list { list-style: none; padding: 0; }
.sim-list li { margin-bottom: 1rem; }
.sim-list p { margin: 0.2rem 0 0; color: var(--muted, #666); font-size: 0.95rem; }

.sim-histogram {
  margin-top: 1rem;
}