:root {
    --background-color: #f0f2f5;
    --card-background-color: #ffffff;
    --text-color: #333333;
    --primary-color: #4CAF50;
    --primary-hover-color: #45a049;
    --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;
}