/* ===== VFS Explorer — Three-pane file browser ===== */

.vfs-explorer {
    display: flex;
    height: calc(100vh - 180px);
    border: 1px solid #d0d5dd;
    border-radius: 4px;
    overflow: hidden;
    font-size: 0.875rem;
    position: relative;
}

/* --- Left pane: Tree --- */
.vfs-explorer .vfs-tree-pane {
    width: 240px;
    min-width: 180px;
    max-width: 380px;
    border-right: 1px solid #d0d5dd;
    background: #f5f6f8;
    overflow-y: auto;
    resize: horizontal;
}

.vfs-explorer .vfs-tree {
    padding: 0.5rem;
}

.vfs-explorer .vfs-tree-item {
    padding: 0.35rem 0.5rem;
    cursor: pointer;
    user-select: none;
    border-radius: 3px;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.8125rem;
    color: #333;
}

.vfs-explorer .vfs-tree-item:hover {
    background: #e4e7ec;
}

.vfs-explorer .vfs-tree-item.selected {
    background: #4a9eff;
    color: #fff;
}

.vfs-explorer .vfs-tree-item.selected:hover {
    background: #3a8eef;
}

.vfs-explorer .vfs-tree-item .expand-icon {
    width: 14px;
    text-align: center;
    font-size: 0.7rem;
    flex-shrink: 0;
}

.vfs-explorer .vfs-tree-item .tree-label {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.vfs-explorer .vfs-tree-children {
    padding-left: 1.1rem;
    display: none;
}

.vfs-explorer .vfs-tree-children.expanded {
    display: block;
}

/* --- Middle pane: File list --- */
.vfs-explorer .vfs-list-pane {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 300px;
}

.vfs-explorer .vfs-toolbar {
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid #d0d5dd;
    background: #fff;
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.vfs-explorer .vfs-toolbar .btn-group .btn {
    font-size: 0.8125rem;
    padding: 0.25rem 0.5rem;
}

.vfs-explorer .vfs-breadcrumb {
    flex: 1;
    min-width: 0;
    overflow: hidden;
}

.vfs-explorer .vfs-breadcrumb .breadcrumb {
    font-size: 0.8125rem;
    margin: 0;
    flex-wrap: nowrap;
    overflow: hidden;
}

.vfs-explorer .vfs-breadcrumb .breadcrumb-item a {
    color: #4a9eff;
    text-decoration: none;
}

.vfs-explorer .vfs-breadcrumb .breadcrumb-item a:hover {
    text-decoration: underline;
}

.vfs-explorer .vfs-file-list {
    flex: 1;
    overflow-y: auto;
    background: #fff;
}

.vfs-explorer .vfs-file-item {
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid #f0f1f3;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    transition: background 0.1s;
}

.vfs-explorer .vfs-file-item:hover {
    background: #f5f6f8;
}

.vfs-explorer .vfs-file-item.selected {
    background: #e7f0ff;
    border-left: 3px solid #4a9eff;
    padding-left: calc(0.75rem - 3px);
}

.vfs-explorer .vfs-file-item .file-icon {
    font-size: 1.4rem;
    width: 28px;
    text-align: center;
    flex-shrink: 0;
    color: #555;
}

.vfs-explorer .vfs-file-item .folder-icon {
    color: #f0ad4e;
}

.vfs-explorer .vfs-file-item .file-thumb {
    width: 36px;
    height: 36px;
    object-fit: cover;
    border-radius: 3px;
    flex-shrink: 0;
}

.vfs-explorer .vfs-file-item .file-info {
    flex: 1;
    min-width: 0;
}

.vfs-explorer .vfs-file-item .file-name {
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: #222;
}

.vfs-explorer .vfs-file-item .file-meta {
    font-size: 0.75rem;
    color: #888;
    white-space: nowrap;
}

/* --- Status bar --- */
.vfs-explorer .vfs-status-bar {
    padding: 0.35rem 0.75rem;
    border-top: 1px solid #d0d5dd;
    background: #f5f6f8;
    font-size: 0.75rem;
    color: #888;
}

/* --- Right pane: Preview --- */
.vfs-explorer .vfs-preview-pane {
    width: 340px;
    min-width: 260px;
    max-width: 500px;
    border-left: 1px solid #d0d5dd;
    background: #fff;
    display: flex;
    flex-direction: column;
    resize: horizontal;
}

.vfs-explorer .vfs-preview-pane.collapsed {
    display: none;
}

.vfs-explorer .vfs-preview-header {
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid #d0d5dd;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #f5f6f8;
    font-size: 0.8125rem;
    font-weight: 600;
}

.vfs-explorer .vfs-preview-content {
    flex: 1;
    overflow-y: auto;
    padding: 0.75rem;
}

.vfs-explorer .preview-image {
    text-align: center;
    margin-bottom: 0.75rem;
}

.vfs-explorer .preview-image img {
    max-width: 100%;
    max-height: 200px;
    border-radius: 4px;
    border: 1px solid #e0e0e0;
}

.vfs-explorer .preview-icon {
    text-align: center;
    padding: 1.5rem 0;
    margin-bottom: 0.75rem;
}

.vfs-explorer .preview-icon i {
    font-size: 3rem;
    color: #999;
}

.vfs-explorer .preview-meta {
    width: 100%;
    font-size: 0.8125rem;
    margin-bottom: 0.75rem;
}

.vfs-explorer .preview-meta th {
    padding: 0.25rem 0.5rem 0.25rem 0;
    color: #888;
    font-weight: 500;
    white-space: nowrap;
    vertical-align: top;
    width: 70px;
}

.vfs-explorer .preview-meta td {
    padding: 0.25rem 0;
    word-break: break-all;
}

.vfs-explorer .preview-section {
    margin-bottom: 0.75rem;
}

.vfs-explorer .preview-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: #888;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 0.25rem;
    display: block;
}

.vfs-explorer .preview-alt-row {
    display: flex;
    gap: 0.25rem;
}

.vfs-explorer .preview-alt-row input {
    font-size: 0.8125rem;
}

.vfs-explorer .preview-actions {
    display: flex;
    gap: 0.35rem;
    flex-wrap: wrap;
    margin-bottom: 0.5rem;
}

.vfs-explorer .preview-actions .btn {
    font-size: 0.75rem;
}

.vfs-explorer .preview-danger {
    border-top: 1px solid #f0f0f0;
    padding-top: 0.5rem;
}

/* --- Drag and drop --- */
.vfs-explorer .vfs-file-list.drag-over {
    background: #f0f7ff;
    outline: 2px dashed #4a9eff;
    outline-offset: -4px;
}

/* --- Loading / Empty / Error states --- */
.vfs-explorer .vfs-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    color: #888;
    font-size: 0.8125rem;
}

.vfs-explorer .vfs-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem 1.5rem;
    color: #999;
    text-align: center;
}

.vfs-explorer .vfs-empty i {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
    opacity: 0.4;
}

.vfs-explorer .vfs-empty p {
    margin: 0;
    font-size: 0.8125rem;
}

.vfs-explorer .vfs-error {
    padding: 1rem;
    color: #dc3545;
    text-align: center;
    font-size: 0.8125rem;
}

/* --- Context menu --- */
.vfs-context-menu {
    position: fixed;
    z-index: 1050;
    background: #fff;
    border: 1px solid #d0d5dd;
    border-radius: 4px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
    min-width: 170px;
    display: none;
    font-size: 0.8125rem;
}

.vfs-context-menu.show {
    display: block;
}

.vfs-context-menu-item {
    padding: 0.4rem 0.75rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    color: #333;
}

.vfs-context-menu-item:hover {
    background: #f5f6f8;
}

.vfs-context-menu-divider {
    height: 1px;
    background: #e0e0e0;
    margin: 0.2rem 0;
}