html {
    font-size: 16px;
    box-sizing: border-box;
}

*, *::before, *::after {
    box-sizing: inherit;
}

body {
    margin: 0;
    font-family: 'Open Sans', sans-serif;
    font-size: 1.125rem;
}

img {
    max-width: 100%;
    display: block;
}


.signature-img {
    margin: 1em 0 2em 0;
}

.author-image {
    margin-bottom: 1em;
}

p {
    margin: 0 0 .5em 0;
}

/* ==== Layout ===== */

.container {
    width: 90%; /* 90% por que os 10% ficam mais como espaços pros lados do container */
    max-width: 900px;
    margin: 0 auto;
}

.container-flex {
    display: flex;
    flex-direction: column;
    margin-bottom: 1.6em;
}


.book-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    grid-gap: 1rem;
}


/* ==== images effects ==== */

.shrink:hover {
    transform: scale(0.95);
    transition: transform 1s;
    
}

.shrink:active {
    opacity: 0.5;
}




/* ===== Typography ===== */


h2 {
    font-family: 'Homemade Apple', sans-serif;
    font-size: 1.375rem;
    border-bottom: 2px solid black;
    margin-top: 0;
}

.description {
    font-size: .9375rem;
    font-weight: 700;
    padding-top: .625em;
}


/* ===== Media Queries ===== */

@media (min-width: 718px) {
    
    .container-flex {
        display: block;
    }

    .author-image {
        width: 33%;
        float: left;
        margin-right: 1em;
    }

    .container-header {
        max-width: 50%;
    }

    .book-container {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }
}