body {
  background: #000;
  color: #00ff9c;
  font-family: monospace;
  text-align: center;
}

.engine-panel {
  margin-top: 100px;
}

.engine-core {
  border: 2px solid #00ff9c;
  padding: 40px;
  width: 320px;
  margin: auto;
  position: relative;
}

.backfire {
  position: absolute;
  top: -20px;
  left: 50%;
  width: 20px;
  height: 40px;
  background: radial-gradient(circle, #00ff9c 0%, transparent 70%);
  transform: translateX(-50%);
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0% { opacity: 0.3; }
  50% { opacity: 1; }
  100% { opacity: 0.3; }
}

.badge {
  display: block;
  margin-top: 10px;
  color: #0f0;
  font-size: 12px;
}