:root {
  --bg-color: #f0f2f5;
  --text-color: #333;
  --primary-color: #1a73e8;
  --container-bg-color: #ffffff;
  --display-bg-color: #fafafa;
  --display-border-color: #ddd;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --button-text-color: white;
}

.dark-mode {
  --bg-color: #121212;
  --text-color: #e0e0e0;
  --primary-color: #7bb0ff;
  --container-bg-color: #1e1e1e;
  --display-bg-color: #2a2a2a;
  --display-border-color: #555;
  --shadow-color: rgba(255, 255, 255, 0.1);
  --button-text-color: #121212;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  font-family: 'Helvetica Neue', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color 0.3s, color 0.3s;
}

.slot-machine {
  position: relative;
  text-align: center;
  padding: 40px;
  border-radius: 20px;
  background-color: var(--container-bg-color);
  box-shadow: 0 10px 30px var(--shadow-color);
  transition: background-color 0.3s;
}

.theme-switch-wrapper {
  position: absolute;
  top: 20px;
  right: 20px;
}

#theme-toggle-btn {
  background: none;
  border: none;
  font-size: 1.5em;
  cursor: pointer;
  color: var(--text-color);
}

h1 {
  margin-bottom: 30px;
  font-size: 2.5em;
  color: var(--primary-color);
}

#food-display {
  width: 300px;
  height: 100px;
  line-height: 100px;
  margin: 0 auto 30px;
  border: 2px solid var(--display-border-color);
  border-radius: 10px;
  font-size: 2em;
  overflow: hidden;
  background-color: var(--display-bg-color);
  transition: background-color 0.3s, border-color 0.3s;
}

#start-stop-btn {
  padding: 15px 30px;
  font-size: 1.2em;
  cursor: pointer;
  border: none;
  border-radius: 8px;
  background-color: var(--primary-color);
  color: var(--button-text-color);
  transition: background-color 0.3s, color 0.3s;
}

#start-stop-btn:hover {
  opacity: 0.8;
}