/* Reset básico */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

/* HEADER */
header {
    background-color: green;
    color: white;
    padding: 20px;
}

nav {
     margin-top: 10px;
}

nav a {
    color: white;
    margin-right: 15px;
    text-decoration: none;
}

/* CONTEÚDO */
main {
    padding: 20px;
}

section {
    margin-bottom: 20px;
}

/* FOOTER */
footer {
     background-color: green;
    color: white;
    text-align: center;
    padding: 10px;
}

/* 🔥 RESPONSIVIDADE */
@media (max-width: 600px) {
    header {
        text-align: center;
    }

    nav {
        display: flex;
        flex-direction: column;
    }

    nav a {
        margin: 5px 0;
    }
}