#zip-puzzle-container {
  text-align: center;
  margin: 30px auto;
  max-width: 400px;
  background: #fafafa;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.zip-title {
  font-family: Arial, sans-serif;
  color: #444;
  margin-bottom: 15px;
}

#zip-grid {
  display: grid;
  grid-template-columns: repeat(5, 60px);
  grid-template-rows: repeat(5, 60px);
  gap: 6px;
  justify-content: center;
  margin-bottom: 15px;
}

.zip-cell {
  background: #e5e5e5;
  border-radius: 8px;
  cursor: pointer;
  font-weight: bold;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  user-select: none;
  transition: background 0.2s;
}

.zip-point {
  background: #000;
  color: #fff;
  font-size: 18px;
  cursor: crosshair;
}

#zip-controls button {
  background: #0073aa;
  color: #fff;
  padding: 8px 20px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 16px;
}

#zip-controls button:hover {
  background: #005f8c;
}