:root {
  --background-color-light: #f0f0f0;
  --text-color-light: #333;
  --container-bg-light: #fff;
  --number-bg-light: #eee;
  --button-bg-light: #4CAF50;
  --button-hover-light: #45a049;

  --background-color-dark: #333;
  --text-color-dark: #f0f0f0;
  --container-bg-dark: #555;
  --number-bg-dark: #444;
  --button-bg-dark: #6200EE;
  --button-hover-dark: #3700B3;
}

[data-theme='light'] {
  --background-color: var(--background-color-light);
  --text-color: var(--text-color-light);
  --container-bg: var(--container-bg-light);
  --number-bg: var(--number-bg-light);
  --button-bg: var(--button-bg-light);
  --button-hover: var(--button-hover-light);
}

[data-theme='dark'] {
  --background-color: var(--background-color-dark);
  --text-color: var(--text-color-dark);
  --container-bg: var(--container-bg-dark);
  --number-bg: var(--number-bg-dark);
  --button-bg: var(--button-bg-dark);
  --button-hover: var(--button-hover-dark);
}

body {
  font-family: sans-serif;
  display: flex;
  flex-direction: column; /* Changed to column to accommodate theme switcher */
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background-color: var(--background-color);
  color: var(--text-color);
  transition: background-color 0.3s, color 0.3s;
}

.theme-switcher {
  margin-bottom: 20px;
}

#theme-toggle {
  padding: 10px 20px;
  font-size: 16px;
  cursor: pointer;
  border: none;
  border-radius: 5px;
  background-color: var(--button-bg);
  color: white;
  transition: background-color 0.3s;
}

#theme-toggle:hover {
  background-color: var(--button-hover);
}


.container {
  text-align: center;
  background-color: var(--container-bg);
  padding: 40px;
  border-radius: 10px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
  transition: background-color 0.3s;
}

h1 {
  margin-bottom: 30px;
}

.numbers {
  display: flex;
  justify-content: center;
  margin-bottom: 30px;
}

.number {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--number-bg);
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 24px;
  margin: 0 10px;
  transition: background-color 0.3s;
}

#generate-btn {
  padding: 15px 30px;
  font-size: 18px;
  cursor: pointer;
  border: none;
  background-color: var(--button-bg);
  color: white;
  border-radius: 5px;
  transition: background-color 0.3s;
}

#generate-btn:hover {
  background-color: var(--button-hover);
}