body {
    font-family: system-ui, -apple-system, sans-serif;
    max-width: 720px;
    margin: 0 auto;
    padding: 1rem;
    color: #222;
    background: #fafafa;
}

nav {
    display: flex;
    gap: 1rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid #ddd;
    margin-bottom: 1.5rem;
}

nav a {
    text-decoration: none;
    color: #0366d6;
}

nav a:hover {
    text-decoration: underline;
}

footer {
    margin-top: 2.5rem;
    padding-top: 0.75rem;
    border-top: 1px solid #ddd;
    color: #666;
    font-size: 0.9rem;
}

form label {
    display: inline-block;
}

button {
    padding: 0.5rem 1.25rem;
    cursor: pointer;
}