.navbar {
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
}

.invalid-feedback {
    display: block;
}

.invalid-feedback:empty {
    display: none;
}

@media screen and (max-width: 575px) {
    .display-4 {
        font-size: 1.75rem;
    }
}

@media screen and (min-width: 576px) and (max-width: 767px) {
    .display-4 {
        font-size: 2.1875rem;
    }
}

html {
    scroll-behavior: smooth;
}

#toasts {
    position: fixed;
    top: 0.5rem;
    right: 40px;
    z-index: 1;
}

#header-brand-link {
    color: inherit;
    text-decoration: none;
}

main {
    padding-bottom: 10rem;
}

.book-list {
    padding: 0;
    list-style: none;
}

.book-list a {
    display: block;
    border: 1px solid #dfdfdf;
    color: inherit;
}

.book-list a:hover {
    background: #dfdfdf;
    text-decoration: none;
}

.book-list .cover-image {
    position: relative;
    overflow: hidden;
    height: 0;
    padding-bottom: 160%;
}

.book-list .cover-image img {
    position: absolute;
    top: 50%;
    left: 50%;
    max-width: 80%;
    max-height: 80%;
    transform: translate(-50%, -50%);
    transition: all 0.3s ease-in-out;
}

.book-list a:hover .cover-image img {
    max-width: 90%;
    max-height: 90%;
}

.book-list .text {
    text-align: center;
    border-top: 1px solid #dfdfdf;
}

.book-list .author-names {
    padding: 0.5rem 1rem 0;
}

.book-list .title {
    font-size: 1.09375rem;
    line-height: 1.25;
    font-weight: 500;
    padding: 0.25rem 1rem 1.25rem;
}

@media screen and (max-width: 575px) {
    .book-list-narrow,
    .book-list-medium {
        margin: 0;
    }

    .book-list-item-medium + .book-list-item-medium {
        margin-top: 30px;
    }
}

@media screen and (min-width: 576px) {
    .book-list-narrow,
    .book-list-medium {
        display: flex;
        flex-flow: row wrap;
        justify-content: flex-start;
        align-items: stretch;
    }

    .book-list-narrow a,
    .book-list-medium a {
        height: 100%;
    }
}

@media screen and (min-width: 576px) and (max-width: 767px) {
    .book-list-narrow,
    .book-list-medium {
        margin: -10px;
    }

    .book-list-item-narrow,
    .book-list-item-medium {
        width: 50%;
        padding: 10px;
    }
}

@media screen and (max-width: 767px) {
    .book-list-wide {
        margin: 0;
    }

    .book-list-item-wide + .book-list-item-wide {
        margin-top: 30px;
    }
}

@media screen and (min-width: 768px) {
    .book-list-wide {
        display: flex;
        flex-flow: row wrap;
        justify-content: flex-start;
        align-items: stretch;
    }

    .book-list-wide a {
        height: 100%;
    }
}

@media screen and (min-width: 768px) and (max-width: 991px) {
    .book-list-narrow,
    .book-list-medium {
        margin: -20px;
    }

    .book-list-item-narrow,
    .book-list-item-medium {
        width: 50%;
        padding: 20px;
    }

    .book-list-wide {
        margin: -15px;
    }

    .book-list-item-wide {
        width: 360px;
        padding: 15px;
    }
}

@media screen and (min-width: 992px) and (max-width: 1199px) {
    .book-list-narrow {
        margin: -10px;
    }

    .book-list-item-narrow {
        width: 25%;
        padding: 10px;
    }

    .book-list-medium {
        margin: -15px;
    }

    .book-list-item-medium {
        width: 33.3333%;
        padding: 15px;
    }

    .book-list-wide {
        margin: -30px;
    }

    .book-list-item-wide {
        width: 480px;
        padding: 30px;
    }
}

@media screen and (min-width: 1200px) {
    .book-list-narrow {
        margin: -10px;
    }

    .book-list-item-narrow {
        width: 20%;
        padding: 10px;
    }

    .book-list-medium {
        margin: -10px;
    }

    .book-list-item-medium {
        width: 25%;
        padding: 10px;
    }

    .book-list-wide {
        margin: -15px;
    }

    .book-list-item-wide {
        width: 380px;
        padding: 15px;
    }
}

.book-single .cover-image img {
    display: block;
    width: 100%;
    height: auto;
}

.book-single .text dt .colon {
    font-weight: 400;
}

@media screen and (max-width: 575px) {
    .book-single .text {
        margin-top: 3rem;
    }
}

#user-borrowings dd,
#user-awaiting-reservations dd,
#user-recommendations dd {
    padding-left: 1em;
}

.recommendation-author-names {
    font-style: italic;
}

.recommendation-book-title {
    font-weight: 700;
}