body {
  margin: 0;
  font-family: sans-serif;
  background: url('balloon-bg.jpg') no-repeat center center fixed;
  background-size: cover;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

.game-container {
  text-align: center;
  flex-grow: 1;
  padding-top: 20px;
  z-index: 1;
  position: relative;
  background-color: rgba(255, 255, 255, 0.8);
  margin: 20px;
  border-radius: 10px;
}

#game-area {
  position: relative;
  width: 90vw;
  height: 60vh;
  margin: 20px auto;
  background-color: white;
  border: 3px dashed #3498db;
  border-radius: 20px;
  overflow: hidden;
}

.bubble {
  width: 60px;
  height: 60px;
  background-color: rgba(52, 152, 219, 0.8);
  border-radius: 50%;
  position: absolute;
  cursor: pointer;
  transition: transform 0.2s ease;
}

.bubble:hover {
  transform: scale(1.2);
}

#startBtn {
  padding: 10px 20px;
  font-size: 18px;
  background-color: #3498db;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

#startBtn:hover {
  background-color: #2980b9;
}

.logo {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 10px;
}

.bubble-icon {
  width: 30px;
  height: 30px;
  border-radius: 50%;
}

.red { background-color: #e74c3c; }
.blue { background-color: #3498db; }
.green { background-color: #2ecc71; }
.yellow { background-color: #f1c40f; }

footer {
  text-align: center;
  padding: 15px 0;
  background-color: #ffffffcc;
  font-size: 14px;
  color: #444;
  border-top: 1px solid #ccc;
  position: fixed;
  bottom: 0;
  width: 100%;
  z-index: 2;
}