body {
    font-family: sans-serif;
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
}
img {
    max-width: 100%;
}
nav {
    margin-bottom: 2rem;
}
nav a {
    margin-right: 1.5rem;
    text-decoration: none;
    color: #333;
}
nav a.active {
    font-weight: bold;
    border-bottom: 2px solid currentColor;
}
footer {
    margin-top: 3rem;
    padding-top: 1rem;
    border-top: 1px solid #ddd;
    font-size: 0.85rem;
    color: #666;
}
footer a {
    color: #333;
    font-weight: bold;
    text-decoration: none;
}