body {
  background: #0d1117;
  color: #f0f6fc;
  font-family: 'Comic Sans MS', sans-serif;
  text-align: center;
  padding: 2rem;
}
h1 {
  font-size: 2.2rem;
  color: #58a6ff;
}
.tier-board {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2rem;
}
.tier {
  border: 2px dashed #58a6ff;
  padding: 1rem;
  min-height: 60px;
  border-radius: 8px;
  text-align: left;
  background: #161b22;
}
.tier span {
  font-weight: bold;
  display: block;
  margin-bottom: 0.5rem;
}
.items, .tier {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.item {
  background: #2ea043;
  color: white;
  padding: 8px 12px;
  border-radius: 6px;
  cursor: grab;
  transition: transform 0.2s;
}
.item:active {
  transform: scale(1.05);
}
button {
  margin-top: 1.5rem;
  padding: 10px 20px;
  font-size: 1rem;
  border: none;
  background: #3fb950;
  color: white;
  border-radius: 6px;
  cursor: pointer;
}
button:hover {
  background: #45c556;
}