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

nav {
    background-color: #222;
    color: white;
    padding: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

nav .left {
    font-weight: bold;
    font-size: 1.2em;
}

nav .right {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

nav a {
    color: white;
    text-decoration: none;
    margin-left: 10px;
    cursor: pointer;
    margin-top: 5px;
}

.login-form {
    display: none;
    position: absolute;
    top: 40px;
    right: 0;
    background-color: #fff;
    color: black;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    z-index: 999;
    width: 100%;
    max-width: 250px;
}

.login-form input {
    display: block;
    margin-bottom: 10px;
    width: 100%;
    padding: 5px;
    box-sizing: border-box;
}

.contenido {
    padding: 20px;
}

@media (max-width: 600px) {
    nav {
        flex-direction: column;
        align-items: flex-start;
    }

    nav .right {
        align-items: flex-start;
        width: 100%;
    }

    nav a {
        margin-left: 0;
    }

    .login-form {
        right: auto;
        left: 0;
        width: 100%;
        max-width: none;
    }

    .contenido {
        padding: 10px;
    }
}