body {
  font-family: 'Segoe UI', sans-serif;
  margin: 0;
  padding: 0;
  text-align: center;
  background: #000;
}
h1 {
  background: #114B5F;
  color: white;
  padding: 20px;
  margin: 0;
  font-size: 24px;
}
button {
  padding: 12px 24px;
  font-size: 18px;
  margin: 5px;
  cursor: pointer;
  border: none;
  background: #028090;
  color: white;
  border-radius: 6px;
}
#gameArea {
  max-width: 900px;
  margin: 10px auto;
  padding: 10px;
  background-image: url('images/background_blueprint.png');
  background-size: cover;
  border-radius: 8px;
  box-shadow: 0 0 12px rgba(0,0,0,0.2);
}
#dropZone {
  border: 3px dashed #fff;
  border-radius: 8px;
  padding: 40px 20px;
  font-size: 20px;
  color: #fff;
  background-color: rgba(0, 0, 0, 0.3);
  margin: 10px;
  transition: 0.3s;
  min-height: 120px;
}
.part {
  display: inline-block;
  margin: 10px;
  padding: 10px;
  width: 90px;
  height: 90px;
  background: #ffffffbb;
  border: 2px solid #088;
  border-radius: 8px;
  cursor: grab;
  font-size: 14px;
  touch-action: none;
  transition: transform 0.3s ease;
}
.part.correct {
  animation: glow 0.6s ease-out;
}
.part.wrong {
  animation: shake 0.4s ease-in-out;
}
@keyframes glow {
  0% { box-shadow: 0 0 10px 2px #0f0; }
  100% { box-shadow: none; }
}
@keyframes shake {
  0% { transform: translateX(0); }
  25% { transform: translateX(-10px); }
  50% { transform: translateX(10px); }
  75% { transform: translateX(-5px); }
  100% { transform: translateX(0); }
}
#score {
  font-size: 22px;
  font-weight: bold;
  color: #fff;
  margin-top: 10px;
  text-shadow: 0 0 5px #000;
}
#status {
  font-size: 18px;
  margin: 10px;
  color: #fff;
  text-shadow: 0 0 3px #000;
}
.confetti {
  position: absolute;
  width: 10px;
  height: 10px;
  background-color: red;
  opacity: 0.8;
  animation: fall 2s linear forwards;
}
@keyframes fall {
  to {
    transform: translateY(800px) rotateZ(360deg);
    opacity: 0;
  }
}
@media (max-width: 600px) {
  .part { width: 70px; height: 70px; font-size: 12px; }
  #dropZone { font-size: 16px; padding: 30px 10px; }
}

.assembled {
  background: #cfc;
  border: 2px solid #4c4;
  margin: 5px;
  display: inline-block;
}

#drone.spinning {
  animation: spin 0.4s linear infinite;
}
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}