.engine-interactive {
  --engine-speed: 60s;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  align-items: center;
  gap: clamp(1.5rem, 5vw, 5rem);
  max-width: 1050px;
  margin: 3rem auto 0;
}
.engine-wheel {
  position: relative;
  width: 100%;
  max-width: 34rem;
  aspect-ratio: 1;
  margin-inline: auto;
  isolation: isolate;
}
.engine-wheel::before,
.engine-wheel::after {
  content: "";
  position: absolute;
  inset: 5%;
  border: 1px solid #2fd4c420;
  border-radius: 50%;
  pointer-events: none;
}
.engine-wheel::after { inset: 26%; border-style: dashed; }
.engine-hub {
  position: absolute;
  inset: 35%;
  display: grid;
  place-items: center;
  border: 1px solid #2fd4c455;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 35%, #193e31, var(--panel));
  color: var(--cream);
  text-align: center;
  font: 900 clamp(.875rem, 1.5vw, 1.2rem)/1.35 Archivo, sans-serif;
  letter-spacing: .06em;
  box-shadow: 0 0 55px #2fd4c40c;
}
.engine-orbit { position: absolute; inset: 19%; }
.engine-orbit,
.engine-stage {
  animation: engine-turn var(--engine-speed) linear infinite;
  animation-play-state: paused;
}
.engine-stage { animation-direction: reverse; }
[data-motion="running"] .engine-orbit,
[data-motion="running"] .engine-stage { animation-play-state: running; }
.engine-wheel:has(.engine-stage:focus-visible) .engine-orbit,
.engine-wheel:has(.engine-stage:focus-visible) .engine-stage { animation-play-state: paused; }
@media (hover: hover) {
  .engine-wheel:hover .engine-orbit,
  .engine-wheel:hover .engine-stage { animation-play-state: paused; }
}
.engine-track { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; fill: none; pointer-events: none; }
.engine-track circle { stroke: #2fd4c460; stroke-width: 2; }
.engine-direction { stroke: var(--amber); stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.engine-stop { position: absolute; left: var(--x); top: var(--y); transform: translate(-50%, -50%); }
.engine-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: .2rem;
  width: clamp(5.75rem, 10vw, 7.5rem);
  min-height: 4.5rem;
  padding: .75rem .5rem;
  border: 1px solid #395449;
  border-radius: 1rem;
  background: var(--panel);
  color: var(--cream);
  cursor: pointer;
  box-shadow: 0 6px 20px #0006;
}
.engine-stage span { color: var(--amber); font: 700 .875rem/1 Inter, sans-serif; }
.engine-stage strong { font: 700 clamp(.875rem, 1.4vw, 1rem)/1.4 Archivo, sans-serif; }
.engine-stage[aria-pressed="true"] { border-color: var(--teal); background: #163b30; box-shadow: 0 0 0 3px #2fd4c414, 0 6px 20px #0006; }
.engine-stage:hover { border-color: var(--teal); }
.engine-stage:focus-visible { outline: 3px solid var(--cream); outline-offset: 5px; }
.engine-explainer { min-width: 0; }
.engine-detail { min-height: 19rem; border-left: 2px solid var(--teal); padding: .25rem 0 .25rem 1.5rem; }
.engine-step-number { margin: 0 0 1rem; color: var(--teal); font: 700 .875rem/1.4 Inter, sans-serif; letter-spacing: .2em; }
.engine-detail h3 { margin: 0 0 .5rem; font: 900 clamp(2rem, 4vw, 3rem)/1.15 Archivo, sans-serif; }
.engine-step-lead { margin: 0 0 1rem; color: var(--cream); font-size: 1.125rem; }
.engine-step-body { max-width: 35ch; margin: 0; color: var(--muted); font-size: 1rem; }
.engine-next { margin: 1.75rem 0 0; color: var(--amber); font: 700 .875rem/1.5 Archivo, sans-serif; letter-spacing: .08em; }
.engine-hint { margin: 1.5rem 0 0; color: var(--muted); font-size: .875rem; }
@keyframes engine-turn { to { transform: rotate(360deg); } }
@media (max-width: 760px) {
  .engine-interactive { grid-template-columns: minmax(0, 1fr); gap: 1.5rem; max-width: 34rem; margin-top: 2rem; }
  .engine-detail { min-height: 16rem; padding-left: 1.2rem; }
  .engine-step-body { max-width: none; }
  .engine-hint { text-align: center; }
}
@media (max-width: 480px) {
  .engine-orbit { inset: 16%; }
  .engine-hub { inset: 36%; }
  .engine-stage { width: clamp(5.625rem, 22vw, 6.5rem); min-height: 4rem; padding-block: .55rem; }
}