:root {
    --background-color: #f0f0f0;
    --card-background-color: #ffffff;
    --primary-color: #4a90e2;
    --text-color: #333333;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="4" height="4" viewBox="0 0 4 4"><path fill="%239C92AC" fill-opacity="0.4" d="M1 3h1v1H1V3zm2-2h1v1H3V1z"></path></svg>');
}