body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
    max-width: 800px;
    margin: 0 auto;
}

header {
    text-align: center;
    padding: 20px 0;
}

nav {
    display: flex;
    justify-content: center;
    gap: 20px;
    padding: 20px 0;
}

nav a {
    color: #007AFF;
    text-decoration: none;
}

section {
    margin: 40px 0;
}

footer {
    text-align: center;
    padding: 20px 0;
    color: #666;
}