:root {
  --background-color: #f0f2f5;
  --text-color: #333;
  --card-bg-color: #ffffff;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --button-bg-color: #4A90E2;
  --button-hover-bg-color: #357ABD;
  --button-text-color: #ffffff;
  --lotto-ball-bg-color: #e0e0e0;
  --noise-opacity: 0.1;
}

[data-theme="dark"] {
  --background-color: #121212;
  --text-color: #e0e0e0;
  --card-bg-color: #1e1e1e;
  --shadow-color: rgba(0, 0, 0, 0.5);
  --button-bg-color: #64B5F6;
  --button-hover-bg-color: #42A5F5;
  --button-text-color: #121212;
  --lotto-ball-bg-color: #424242;
  --noise-opacity: 0.05;
}

body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: var(--background-color);
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%239C92AC' fill-opacity='var(--noise-opacity)'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    transition: background-color 0.3s ease;
    color: var(--text-color);
}