/* Modal xem file online (PDF / ảnh / DOCX / XLSX) — ID19.
   Tự viết, không phụ thuộc thư viện ngoài, để tránh xung đột phiên bản Bootstrap/SweetAlert2. */

.file-viewer-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.65);
    z-index: 10500;
    align-items: center;
    justify-content: center;
    padding: 12px;
}

.file-viewer-overlay.is-open {
    display: flex;
}

.file-viewer-box {
    background: #fff;
    width: 96vw;
    height: 96vh;
    border-radius: 6px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
}

.file-viewer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    border-bottom: 1px solid #e0e0e0;
    flex: 0 0 auto;
}

.file-viewer-title {
    font-weight: 600;
    font-size: 1rem;
    flex: 1 1 auto;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-viewer-toolbar {
    display: flex;
    align-items: center;
    gap: 6px;
    flex: 0 0 auto;
    margin: 0 12px;
}

.file-viewer-tool-btn {
    border: 1px solid #ccc;
    background: #f7f7f7;
    border-radius: 4px;
    padding: 4px 9px;
    cursor: pointer;
    font-size: 0.85rem;
    line-height: 1.2;
    color: #333;
    white-space: nowrap;
}

.file-viewer-tool-btn:hover {
    background: #e9e9e9;
}

.file-viewer-zoom-label {
    min-width: 46px;
    text-align: center;
    font-size: 0.85rem;
    cursor: pointer;
    user-select: none;
}

.file-viewer-tool-hidden {
    display: none !important;
}

.file-viewer-close {
    border: none;
    background: transparent;
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    color: #666;
}

.file-viewer-close:hover {
    color: #000;
}

.file-viewer-body {
    flex: 1 1 auto;
    overflow: auto;
    position: relative;
    background: #f5f5f5;
}

.file-viewer-frame {
    width: 100%;
    height: 100%;
    border: none;
}

.file-viewer-image-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: 10px;
}

.file-viewer-image {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.file-viewer-loading,
.file-viewer-error {
    padding: 40px 20px;
    text-align: center;
    color: #555;
}

.file-viewer-error {
    color: #b02a37;
}

/* Trạng thái chờ: bản xem của file Office cũ cỡ lớn đang được convert ở hàng đợi nền. */
.file-viewer-pending {
    padding: 48px 20px;
    text-align: center;
    color: #555;
}

.file-viewer-pending-text {
    margin-top: 16px;
}

.file-viewer-spinner {
    width: 36px;
    height: 36px;
    margin: 0 auto;
    border: 3px solid rgba(0, 0, 0, .15);
    border-top-color: #0d6efd;
    border-radius: 50%;
    animation: file-viewer-spin 0.9s linear infinite;
}

@keyframes file-viewer-spin {
    to { transform: rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
    .file-viewer-spinner { animation: none; }
}

.file-viewer-docx {
    background: #fff;
    padding: 24px;
    max-width: 90%;
    margin: 0 auto;
    word-wrap: break-word;
}

.file-viewer-docx img {
    max-width: 100%;
    height: auto;
}

.file-viewer-docx table {
    border-collapse: collapse;
    max-width: 100%;
}

.file-viewer-xlsx-tabs {
    display: flex;
    gap: 4px;
    padding: 8px 8px 0;
    background: #fff;
    border-bottom: 1px solid #ddd;
    flex-wrap: wrap;
    flex: 0 0 auto;
}

.file-viewer-xlsx-tab {
    padding: 6px 12px;
    border: 1px solid #ddd;
    border-bottom: none;
    border-radius: 4px 4px 0 0;
    background: #f0f0f0;
    cursor: pointer;
    font-size: 0.85rem;
}

.file-viewer-xlsx-tab.active {
    background: #fff;
    font-weight: 600;
}

.file-viewer-xlsx-wrap {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.file-viewer-xlsx-table-wrap {
    background: #fff;
    overflow: auto;
    flex: 1 1 auto;
    padding: 8px;
}

.file-viewer-xlsx-table {
    border-collapse: collapse;
    font-size: 0.85rem;
}

.file-viewer-xlsx-table td,
.file-viewer-xlsx-table th {
    border: 1px solid #ddd;
    padding: 4px 8px;
    white-space: nowrap;
}

body.file-viewer-open {
    overflow: hidden;
}

.file-viewer-open-btn {
    margin-left: 4px;
}