body {
  margin: 0;
  padding: 0;
  background: #0f0f0f;
  color: white;
  font-family: monospace;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  user-select: none;
}

canvas {
  background: #111;
  border: 2px solid #00ffcc;
  margin-top: 10px;
}

.instructions {
  text-align: center;
  margin-top: 10px;
}

.menu {
  text-align: center;
  margin-top: 80px;
}

.menu button {
  background: #00ffcc;
  color: black;
  border: none;
  padding: 15px 30px;
  font-size: 18px;
  cursor: pointer;
  border-radius: 8px;
  margin-top: 15px;
}

.menu button:hover {
  background: #00cc99;
}

.hud {
  margin-top: 15px;
  width: 600px;
  max-width: 90%;
  display: flex;
  justify-content: space-around;
  font-size: 18px;
}

.power-bar-bg {
  width: 150px;
  height: 15px;
  background: #333;
  border-radius: 8px;
  margin-top: 4px;
  overflow: hidden;
  display: inline-block;
  vertical-align: middle;
}

.power-bar-fill {
  height: 100%;
  background: #00ffcc;
  width: 100%;
  transition: width 0.3s ease;
  border-radius: 8px 0 0 8px;
}