physics.css

.physics-page { overflow: hidden; }

.playground {
  position: relative;
  height: calc(100vh - 64px);
  margin: 0 24px 24px;
  border-radius: 14px;
  background: radial-gradient(ellipse at 50% 35%, var(--surface), var(--tile));
  overflow: hidden;
}

.playground canvas { display: block; width: 100%; height: 100%; touch-action: none; }

.playground-bar {
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  pointer-events: none;
}

.playground-bar .stage-hint { position: static; margin: 0; }

.playground-bar .button { pointer-events: auto; background: var(--surface); }

@media (max-width: 640px) {
  .playground { margin: 0 16px 16px; height: calc(100vh - 120px); }
}