.pdf-flipbook-modal .modal-dialog {
    width: calc(100% - 20px);
    max-width: 1500px;
    margin: 10px auto;
}

.pdf-flipbook-modal .modal-content {
    height: calc(100vh - 20px);
    min-height: 500px;

    display: flex;
    flex-direction: column;
}

.pdf-flipbook-modal .modal-header,
.pdf-flipbook-modal .modal-footer {
    flex: 0 0 auto;
}

.pdf-flipbook-modal .modal-body {
    position: relative;
    flex: 1 1 auto;
    min-height: 0;
    padding: 15px;
    overflow: hidden;
    background: #e8e8e8;
}

.pdf-flipbook-modal .modal-footer {
    flex: 0 0 auto;
    min-height: 0;
    padding: 6px 10px;
}

.pdf-flipbook__toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;

    min-height: 34px;
    text-align: left;
}

.pdf-flipbook__toolbar .btn {
    padding: 5px 10px;
    line-height: 18px;
}

.pdf-flipbook__counter {
    min-width: 95px;
    line-height: 30px;
}

.pdf-flipbook__close {
    position: absolute;
    z-index: 30;
    top: 8px;
    right: 12px;

    width: 38px;
    height: 38px;
    padding: 0;

    border: 0;
    border-radius: 50%;

    background: rgba(0, 0, 0, 0.55);
    color: #fff;

    font-size: 30px;
    font-weight: 300;
    line-height: 34px;
    text-align: center;
}

.pdf-flipbook__close:hover,
.pdf-flipbook__close:focus {
    background: rgba(0, 0, 0, 0.8);
    color: #fff;
    outline: none;
}

#pdfFlipbookContainer {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
	opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.2s ease;
}
#pdfFlipbookContainer.is-ready {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

#pdfFlipbookViewport {
    opacity: 0;
    visibility: hidden;
}

#pdfFlipbookViewport.is-ready {
    opacity: 1;
    visibility: visible;
}

#pdfFlipbookViewport:fullscreen {
    width: 100vw;
    height: 100vh;
    padding: 20px;
    box-sizing: border-box;
    background: #222;
}

#pdfFlipbookViewport:-webkit-full-screen {
    width: 100vw;
    height: 100vh;
    padding: 20px;
    box-sizing: border-box;
    background: #222;
}

#pdfFlipbookViewport:fullscreen #pdfFlipbookContainer,
#pdfFlipbookViewport:-webkit-full-screen #pdfFlipbookContainer {
    width: 100%;
    height: 100%;
}


.pdf-flipbook__viewport {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.pdf-flipbook__viewport.is-ready {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.pdf-flipbook__viewport {
    position: relative;
    width: 100%;
    height: 100%;
    min-height: 300px;
    overflow: hidden;

    display: flex;
    align-items: center;
    justify-content: center;
}

.pdf-flipbook__book {
    position: relative;
    flex: 0 0 auto;
}

.pdf-flipbook__page {
    position: relative;
    overflow: hidden;
    background: #fff;
}

.pdf-flipbook__page-content {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;

    display: flex;
    align-items: center;
    justify-content: center;

    width: 100%;
    height: 100%;
    overflow: hidden;
}

.pdf-flipbook__page-content canvas {
    position: static !important;
    display: block;
    flex: 0 0 auto;

    max-width: 100%;
    max-height: 100%;
}

/*
 * Loader.
 */
.pdf-flipbook__loading {
    position: absolute;
    z-index: 10;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    font-size: 16px;
}

.pdf-flipbook__spinner {
    display: block;
    width: 38px;
    height: 38px;
    margin: 0 auto 12px;
    border: 4px solid rgba(0, 0, 0, 0.15);
    border-top-color: rgba(0, 0, 0, 0.7);
    border-radius: 50%;
    animation: pdf-flipbook-spin 0.8s linear infinite;
}

@keyframes pdf-flipbook-spin {
    to {
        transform: rotate(360deg);
    }
}

/*
 * Komunikat błędu.
 */
.pdf-flipbook__viewport + .alert,
.pdf-flipbook-modal .alert {
    margin-bottom: 0;
}

/*
 * Dolny pasek.
 */
.pdf-flipbook__toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 15px;
    text-align: left;
}

.pdf-flipbook__navigation,
.pdf-flipbook__actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.pdf-flipbook__counter {
    display: inline-block;
    min-width: 100px;
    text-align: center;
}

/*
 * Bootstrap 3 nie obsługuje właściwości gap wszędzie tam,
 * gdzie wymagane jest wsparcie bardzo starych przeglądarek.
 */
.pdf-flipbook__navigation > * {
    margin-right: 8px;
}

.pdf-flipbook__navigation > *:last-child {
    margin-right: 0;
}

.pdf-flipbook__actions > * {
    margin-left: 8px;
}

.pdf-flipbook__actions > *:first-child {
    margin-left: 0;
}

@media (max-width: 767px) {
    .pdf-flipbook-modal .modal-dialog {
        width: auto;
        margin: 10px;
    }

    .pdf-flipbook-modal .modal-content {
        height: calc(100vh - 20px);
        min-height: 400px;
    }

    .pdf-flipbook-modal .modal-header {
        padding: 10px 15px;
    }

    .pdf-flipbook-modal .modal-body {
        padding: 5px;
    }

    .pdf-flipbook__toolbar {
        display: block;
        padding: 10px;
        text-align: center;
    }

    .pdf-flipbook__navigation {
        justify-content: center;
        margin-bottom: 10px;
    }

    .pdf-flipbook__actions {
        justify-content: center;
    }

    .pdf-flipbook__counter {
        min-width: 75px;
        font-size: 12px;
    }

    .pdf-flipbook__navigation .btn {
        font-size: 0;
    }

    .pdf-flipbook__navigation .btn .glyphicon {
        font-size: 14px;
        margin: 0;
    }
}