body {
    margin: 0;
    font-family: Arial, sans-serif;
    display: block;
}
/* Topbar sempre no topo */
.topbar {
    background: #222;
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 15px;
    flex-wrap: wrap;
}

.topbar img.logo {
    height: 60px;
    width: auto;
}

/* Layout principal */
.container {
    display: flex;
    height: calc(100vh - 50px);
}

/* Botão de menu – escondido por padrão */
#menu-toggle {
    display: none;
    background: #444;
    color: white;
    padding: 10px;
    font-size: 20px;
    border: none;
    cursor: pointer;
    margin-top: 10px;
    width: 100%;
}

nav {
    width: 200px;
    background: #333;
    color: #fff;
    padding: 20px;
    box-sizing: border-box;
}

nav h3 {
    margin-top: 0;
}

nav a {
    display: block;
    color: white;
    text-decoration: none;
    margin: 10px 0;
    cursor: pointer;
}

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

#conteudo {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
}

/* --- RESPONSIVO --- */
@media (max-width: 768px) {
    .topbar {
        flex-direction: column;
        align-items: flex-start;
    }

    .topbar img.logo {
        width: 100%;
        height: auto;
    }

    .container {
        flex-direction: column;
        height: auto;
    }

    #menu-toggle {
        display: block;
    }

    nav {
        display: none;
        width: 100%;
        padding: 10px;
    }

    nav.ativo {
        display: block;
    }

    nav a {
        margin: 5px 0;
        text-align: center;
        background: #444;
        padding: 10px;
        border-radius: 5px;
    }

    #conteudo {
        padding: 10px;
    }
}