/* ===== Regras gerais ===== */

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

body {
    font-family: Calibri, sans-serif;
    background-color: #fff;
}

a {
    color: #fff;
    text-decoration: none;
}

/* ===== Cabeçalho: logo à esquerda e menu à direita ===== */

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 20px;
    background-color: #1c1d20;
}

header > a {
    font-size: 1.3em;
}

nav ul {
    display: flex;
    list-style: none;
}

nav li {
    margin-left: 30px;
}

nav a {
    font-family: Consolas, monospace;
}

/* ===== Título da seção ===== */

h3 {
    margin: 50px 0;
    font-family: Consolas, monospace;
    font-size: 1.4em;
    text-align: center;
}

/* ===== Galeria de imagens com Flexbox ===== */

section {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    width: 80%;
    margin: 0 auto;
}

article {
    flex: 1 1 280px;
    max-width: 600px;
}

article img {
    display: block;
    width: 100%;
}

article p {
    color: #999;
    line-height: 1;
    text-align: center;
}

/* ===== Media Query: telas de até 670px ===== */

@media (max-width: 670px) {
    header > a {
        font-size: 3.25em;
    }

    nav ul {
        display: block;
    }

    nav li {
        margin: 10px;
    }

    nav a {
        display: block;
        background-color: #aaa;
    }

    section {
        width: 90%;
        row-gap: 60px;
    }

    article {
        flex-basis: 100%;
    }

    article p {
        font-size: 1.5em;
    }
}