body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f5f5f5;
}

.topnav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #222;
    color: #fff;
    padding: 10px 15px;
}

.topnav .brand {
    font-size: 1.2rem;
    font-weight: bold;
}

.topnav nav {
    display: flex;
    gap: 15px;
}

.topnav nav a {
    color: #fff;
    text-decoration: none;
    font-size: 1rem;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 1.5rem;
}

@media (max-width: 700px) {
    .menu-toggle {
        display: block;
    }
    .topnav nav {
        display: none;
        flex-direction: column;
        background: #333;
        padding: 10px;
    }
    .topnav nav.open {
        display: flex;
    }
}

#content {
    padding: 20px;
    background: #fff;
    max-width: 900px;
    margin: 20px auto;
    border-radius: 6px;
}