/* ===== File Viewer Panel ===== */

.chat-body {
    display: flex;
    flex: 1;
    overflow: hidden;
    min-height: 0;
}

.chat-body .chat-container {
    flex: 1;
    min-width: 0;
    transition: flex 0.2s ease;
}

.chat-body.viewer-open .chat-container {
    flex: 0 0 50%;
}

/* ===== Knowledge Base Sidebar Section ===== */

.kb-panel--hidden {
    display: none;
}

.kb-panel-files {
    display: flex;
    flex-direction: column;
    padding: 4px 0;
}

.kb-panel-file {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 5px 8px;
    font-size: 13px;
    color: var(--color-text-primary);
    text-decoration: none;
    overflow: hidden;
    border-radius: 4px;
}

.kb-panel-file > span:last-child {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.kb-panel-file:hover {
    text-decoration: underline;
    background-color: var(--color-bg-hover);
}

.file-viewer {
    width: 50%;
    display: flex;
    flex-direction: column;
    border-left: 1px solid var(--color-border-light);
    background-color: var(--color-bg-primary);
    overflow: hidden;
}

.file-viewer--hidden {
    display: none;
}

/* ===== Toolbar ===== */

.file-viewer-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px;
    border-bottom: 1px solid var(--color-border-light);
    background-color: var(--color-bg-secondary);
    flex-shrink: 0;
    gap: 8px;
    min-height: 44px;
}

.file-viewer-name {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
    min-width: 0;
}

.file-viewer-toolbar-actions {
    display: flex;
    align-items: center;
    gap: 4px;
    flex-shrink: 0;
}

.file-viewer-toolbar-actions button[hidden] {
    display: none;
}

.file-viewer-toolbar-actions button {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4px 10px;
    border: 1px solid var(--color-border-medium);
    border-radius: 4px;
    background: var(--color-bg-primary);
    color: var(--color-text-secondary);
    font-size: 12px;
    cursor: pointer;
    white-space: nowrap;
}

.file-viewer-toolbar-actions button:hover {
    background-color: var(--color-bg-secondary);
    color: var(--color-text-primary);
}

.file-viewer-close-btn {
    font-size: 16px !important;
    padding: 4px 8px !important;
}

/* ===== Content Area ===== */

.file-viewer-content {
    flex: 1;
    overflow: auto;
    padding: 0;
    min-height: 0;
    display: flex;
    flex-direction: column;
}

.file-viewer-content iframe {
    width: 100%;
    height: 100%;
    border: none;
    display: block;
}

.file-viewer-content img {
    max-width: 100%;
    max-height: 100%;
    display: block;
    margin: auto;
    padding: 16px;
    object-fit: contain;
}

.file-viewer-content .viewer-text {
    padding: 16px;
    font-family: 'Google Sans', 'Roboto', sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--color-text-primary);
}

.file-viewer-content .viewer-text table {
    border-collapse: collapse;
    margin: 12px 0;
    width: 100%;
}

.file-viewer-content .viewer-text th,
.file-viewer-content .viewer-text td {
    border: 1px solid var(--color-border-light);
    padding: 8px 12px;
    text-align: left;
}

.file-viewer-content .viewer-text th {
    background-color: var(--color-bg-tertiary);
    font-weight: 600;
}

.file-viewer-content .viewer-code-wrap {
    display: flex;
    overflow: auto;
    height: 100%;
    background: var(--color-bg-code);
}

.file-viewer-content .viewer-line-nums {
    padding: 16px 12px;
    margin: 0;
    text-align: right;
    color: var(--color-text-tertiary);
    background: var(--color-bg-secondary);
    border-right: 1px solid var(--color-border-light);
    user-select: none;
    flex-shrink: 0;
    font-family: 'SFMono-Regular', 'Consolas', 'Liberation Mono', monospace;
    font-size: 13px;
    line-height: 1.5;
}

.file-viewer-content .viewer-code {
    padding: 16px;
    margin: 0;
    flex: 1;
    font-family: 'SFMono-Regular', 'Consolas', 'Liberation Mono', monospace;
    font-size: 13px;
    line-height: 1.5;
    color: var(--color-text-primary);
    white-space: pre;
    background: var(--color-bg-code);
}

/* ===== DOCX Viewer ===== */

.file-viewer-content .viewer-docx {
    padding: 24px;
    overflow: auto;
    flex: 1;
    background: #fff;
    color: #000;
}

/* ===== XLSX Viewer ===== */

.file-viewer-content .viewer-xlsx {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
}

.file-viewer-content .viewer-xlsx-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 2px;
    padding: 6px 8px;
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border-light);
    flex-shrink: 0;
}

.file-viewer-content .viewer-xlsx-tab {
    padding: 3px 12px;
    font-size: 12px;
    border: 1px solid var(--color-border-medium);
    border-radius: 3px;
    background: var(--color-bg-primary);
    color: var(--color-text-secondary);
    cursor: pointer;
    white-space: nowrap;
}

.file-viewer-content .viewer-xlsx-tab:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

.file-viewer-content .viewer-xlsx-tab--active {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    font-weight: 600;
    border-color: var(--color-border-medium);
}

.file-viewer-content .viewer-xlsx-sheet {
    overflow: auto;
    flex: 1;
    padding: 16px;
    min-height: 0;
}

.file-viewer-content .viewer-xlsx-sheet table {
    border-collapse: collapse;
    font-size: 13px;
    white-space: nowrap;
}

.file-viewer-content .viewer-xlsx-sheet td,
.file-viewer-content .viewer-xlsx-sheet th {
    border: 1px solid var(--color-border-light);
    padding: 4px 10px;
    color: var(--color-text-primary);
}

.file-viewer-content .viewer-xlsx-sheet tr:first-child td,
.file-viewer-content .viewer-xlsx-sheet th {
    background: var(--color-bg-tertiary);
    font-weight: 600;
}

/* ===== PDF Viewer ===== */

.pdf-canvas-wrap {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 16px;
    gap: 12px;
    min-height: 0;
}

.pdf-canvas-wrap canvas {
    display: block;
    max-width: 100%;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    flex-shrink: 0;
}