body {
  margin: 0;
  padding: 0;
  font-family: 'Arial', sans-serif;
  background-color: #222;
  color: #fff;
  overflow: hidden;
  transition: background-color 0.3s, color 0.3s;
  font-size: clamp(12px, 1.5vw, 18px);
}

body.light-mode {
  background-color: #f0f0f0;
  color: #000;
}

#game-container {
  width: 800px;
  height: 600px;
  margin: 0 auto;
  text-align: center;
  overflow-y: auto;
  box-sizing: border-box;
  padding: 10px;
}

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

select, button {
  padding: 5px;
  font-size: 1em;
  cursor: pointer;
}

#themeImage {
  width: 120px;
  height: 120px;
  cursor: pointer;
  margin: 10px 0;
  transition: transform 0.1s ease;
}

#themeImage:active {
  transform: scale(1.1);
}

button.upgrade {
  margin: 5px;
  padding: 5px 10px;
  font-size: 1em;
}

.achievement {
  margin: 5px 0;
}