:root {
  --background-color: #f8f9fa;
  --text-color: #212529;
  --generator-bg-color: #f0f0f0;
  --generator-shadow: 0 0 10px rgba(0,0,0,0.1);
  --button-bg-color: #007bff;
  --button-hover-bg-color: #0056b3;
  --regular-number-bg-color: #28a745;
  --lucky-number-bg-color: #dc3545;
}

[data-theme="dark"] {
  --background-color: #212529;
  --text-color: #f8f9fa;
  --generator-bg-color: #343a40;
  --generator-shadow: 0 0 10px rgba(255,255,255,0.1);
  --button-bg-color: #0056b3;
  --button-hover-bg-color: #007bff;
  --regular-number-bg-color: #1e7e34;
  --lucky-number-bg-color: #b21f2d;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  display: flex;
  flex-direction: column; 
  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-container {
  position: absolute;
  top: 20px;
  right: 20px;
}

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

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