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/*!
 * Встроенный просмотрщик PDF-файлов сайта ИТУЭ.
 * Разметка: Views/Shared/_PdfViewer.cshtml
 * Логика:   Scripts/pdf-viewer.js (на основе pdf.js)
 */

.pdf-reader {
    --pdf-reader-height: 820px;
    --pdf-reader-bg: #e9ecef;
    display: flex;
    flex-direction: column;
    border: 1px solid #dee2e6;
    border-radius: .25rem;
    background-color: #fff;
    overflow: hidden;
}

/* Шапка с названием документа */
.pdf-reader__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: .5rem;
    padding: .4rem .75rem;
    background-color: #f8f9fa;
    border-bottom: 1px solid #dee2e6;
}

.pdf-reader__title {
    flex: 1 1 auto;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    font-size: .875rem;
    font-weight: 600;
    color: #343a40;
}

.pdf-reader__badge {
    flex: 0 0 auto;
}

/* Панель инструментов */
.pdf-reader__toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: .25rem .5rem;
    padding: .4rem .5rem;
    background-color: #fff;
    border-bottom: 1px solid #dee2e6;
}

.pdf-reader__group {
    display: flex;
    align-items: center;
    gap: .25rem;
}

.pdf-reader__group--actions {
    margin-left: auto;
}

.pdf-reader__toolbar .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: .2rem .4rem;
    line-height: 1;
}

.pdf-reader__icon {
    width: 1rem;
    height: 1rem;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.pdf-reader__pager {
    display: flex;
    align-items: center;
    gap: .3rem;
    font-size: .875rem;
    color: #495057;
}

.pdf-reader__pager .form-control {
    width: 4.25rem;
    padding: .15rem .25rem;
    text-align: center;
    height: auto;
    -moz-appearance: textfield;
}

.pdf-reader__pager .form-control::-webkit-outer-spin-button,
.pdf-reader__pager .form-control::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.pdf-reader__pager-sep {
    color: #adb5bd;
}

.pdf-reader__pager-count {
    min-width: 1.5rem;
    text-align: left;
}

.pdf-reader__zoom {
    min-width: 3.25rem;
    text-align: center;
    font-size: .8125rem;
    color: #495057;
    font-variant-numeric: tabular-nums;
}

/* Область просмотра */
.pdf-reader__stage {
    position: relative;
    flex: 1 1 auto;
    height: var(--pdf-reader-height);
    overflow: auto;
    background-color: var(--pdf-reader-bg);
    outline: none;
    -webkit-overflow-scrolling: touch;
}

.pdf-reader__stage:focus {
    box-shadow: inset 0 0 0 2px rgba(23, 162, 184, .4);
}

.pdf-reader__pages {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 1rem .75rem 2rem;
}

/* Одна страница документа */
.pdf-reader__page {
    position: relative;
    background-color: #fff;
    box-shadow: 0 1px 4px rgba(0, 0, 0, .25);
    flex: 0 0 auto;
}

.pdf-reader__page canvas {
    display: block;
    width: 100%;
    height: 100%;
}

.pdf-reader__page .textLayer {
    z-index: 1;
}

.pdf-reader__page-number {
    position: absolute;
    right: .4rem;
    bottom: .4rem;
    z-index: 2;
    padding: 0 .35rem;
    border-radius: .25rem;
    background-color: rgba(255, 255, 255, .85);
    color: #6c757d;
    font-size: .75rem;
    line-height: 1.4;
    pointer-events: none;
}

.pdf-reader__page--skeleton {
    background: linear-gradient(135deg, #fdfdfd 25%, #f1f3f5 25%, #f1f3f5 50%, #fdfdfd 50%, #fdfdfd 75%, #f1f3f5 75%);
    background-size: 24px 24px;
    box-shadow: none;
    border: 1px dashed #ced4da;
}

/* Загрузка и сообщения */
.pdf-reader__progress,
.pdf-reader__message {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 5;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    text-align: center;
    background-color: rgba(255, 255, 255, .94);
}

.pdf-reader__progress[hidden],
.pdf-reader__message[hidden] {
    display: none;
}

.pdf-reader__progress-bar-wrap {
    width: 320px;
    max-width: 80%;
    height: .5rem;
}

.pdf-reader__progress-text {
    margin-top: .75rem;
    font-size: .875rem;
    color: #6c757d;
}

/* Полноэкранный режим */
.pdf-reader:fullscreen {
    display: flex;
    flex-direction: column;
}

.pdf-reader.is-fullscreen {
    position: fixed;
    z-index: 1080;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 0;
    border: 0;
}

.pdf-reader.is-fullscreen .pdf-reader__stage,
.pdf-reader:fullscreen .pdf-reader__stage {
    height: auto;
}

/* Мобильные устройства */
@media (max-width: 767.98px) {
    .pdf-reader__stage {
        height: 65vh;
    }

    .pdf-reader__group--actions {
        margin-left: 0;
        width: 100%;
        justify-content: flex-end;
    }
}

/* Печать страницы сайта: показываем только документ */
@media print {
    .pdf-reader__toolbar,
    .pdf-reader__header {
        display: none;
    }

    .pdf-reader,
    .pdf-reader__stage {
        height: auto;
        border: 0;
    }
}