* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: system-ui, sans-serif;
}

body {
  background: linear-gradient(180deg, #0f2027, #203a43, #2c5364);
  color: white;
  height: 100vh;
  overflow: hidden;
}

header {
  text-align: center;
  padding: 1rem;
}

#stats {
  display: flex;
  justify-content: center;
  gap: 1rem;
  font-size: 0.9rem;
}

#game-area {
  position: relative;
  width: 100%;
  height: calc(100vh - 140px);
  overflow: hidden;
}

.bubble {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #fff, #4fc3f7);
  cursor: pointer;
  animation: floatUp linear forwards;
}

@keyframes floatUp {
  from {
    transform: translateY(0);
  }
  to {
    transform: translateY(-120vh);
  }
}

footer {
  text-align: center;
  padding: 0.5rem;
  font-size: 0.8rem;
  opacity: 0.7;
}