@-moz-document regexp("^.*\\.pdf(?:[?#].*)?$") {
    /* === Variables === */
    :root {
        --bg-color: #292D32;
        --input-bg-color: #2c2c2c;
        --text-color: #ccc;
        --border-color: #555;
        --loading-bar-color: #333;
        --icon-filter: invert(100%) brightness(200%);
    }

    /* === Page Inversion (for PDF content) === */
    .page canvas {
        filter: invert(100%) !important;
    }

    /* === General Backgrounds === */
    body,
    #outerContainer,
    #mainContainer,
    #viewerContainer,
    #sidebarContainer,
    #sidebarContent,
    #thumbnailView,
    #outlineView,
    #attachmentsView,
    #layersView,
    .doorHangerRight,
    .menu,
    .editorParamsToolbar,
    .menuContainer,
    .dropdownToolbarButton select,
    .dialog,
    .dialog .mainContainer {
        background-color: var(--bg-color) !important;
        color: var(--text-color) !important;
    }

    /* === Toolbar Styling === */
    #toolbarContainer,
    .toolbar,
    #toolbarSidebar {
        background-color: var(--bg-color) !important;
        color: var(--text-color) !important;
    }

    .toolbarButton {
        background-color: transparent !important;
        color: var(--text-color) !important;
    }

    .toolbarButton > svg,
    .toolbarButton::before,
    .toolbarButton::after {
        filter: var(--icon-filter) !important;
    }

    .toolbarButton > svg path {
        fill: #ffffff !important;
    }

    /* === Inputs and Dropdowns === */
    .toolbarField,
    select,
    #scaleSelect option,
    .dropdown button,
    .editorParamsLabel {
        background-color: var(--input-bg-color) !important;
        color: var(--text-color) !important;
    }

    /* Hover effects */
    .dropdown button:hover {
        background-color: var(--loading-bar-color) !important;
    }

    /* === Labels, Page Counters === */
    .toolbarLabel,
    #numPages,
    #pageNumber {
        color: var(--text-color) !important;
    }

    /* === Loading Bar === */
    #loadingBar {
        background-color: var(--loading-bar-color) !important;
    }
}