body {
  margin: 0;
  padding: 0;
  background-color: #111;
  color: #fff;
  font-family: "Press Start 2P", monospace;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  overflow: hidden;
}

#game-container {
  position: relative;
  width: 400px;
  height: 600px; /* Scaled up 2x from 200x300 */
  border: 4px solid #444;
  background-color: #000;
}

canvas {
  width: 100%;
  height: 100%;
  image-rendering: auto;
  display: block;
}

#ui-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none; /* Let clicks pass through to canvas... mostly */
  display: flex;
  flex-direction: column;
}

#top-bar {
  display: flex;
  justify-content: space-between;
  padding: 10px;
  font-size: 10px;
  text-shadow: 1px 1px 0 #000;
}

.hidden {
  display: none !important;
}

#shop-panel {
  pointer-events: auto;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(0, 0, 0, 0.9);
  border: 2px solid #fff;
  padding: 20px;
  width: 80%;
  text-align: center;
  box-sizing: border-box;
}

#shop-panel h2 {
  font-size: 14px;
  margin-top: 0;
  margin-bottom: 20px;
  color: #ff0;
}

.upgrade-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
  font-size: 8px;
}

button {
  font-family: "Press Start 2P", monospace;
  background: #333;
  color: #fff;
  border: 2px solid #fff;
  padding: 8px;
  font-size: 8px;
  cursor: pointer;
  text-transform: uppercase;
}

button:hover {
  background: #555;
  color: #ff0;
  border-color: #ff0;
}

button:disabled {
  background: #222;
  color: #555;
  border-color: #555;
  cursor: not-allowed;
}

#btn-open-shop {
  pointer-events: auto;
  position: absolute;
  bottom: 10px;
  right: 10px;
}

#game-over {
  pointer-events: auto;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  background: rgba(0, 0, 0, 0.8);
  padding: 20px;
  border: 2px solid #f00;
}

#game-over h1 {
  font-size: 20px;
  color: #f00;
  margin-bottom: 20px;
}