.page-outline .page-container {
    box-sizing: initial;
    border-bottom: dashed thin #BDBDBD;
}

div.page-container, div.back-page-container, div.cover-page-container {
    margin-top: calc(57px / var(--scale, 1))!important;
}

div.cover-page-container:nth-of-type(1) {
    margin-top: 0px;
}

div.page-container, div.cover-page-container, div.back-page-container {
    box-shadow: 0 3px 3px rgba(0, 0, 0, 0.25)!important;
}

div.page-container[data-locked], div.cover-page-container[data-locked], div.back-page-container[data-locked] {
    outline: 2px solid #636B78;
}

div.page-container[data-locked]::before, div.cover-page-container[data-locked]::before, div.back-page-container[data-locked]::before {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 100;
    content: '';
    transition: background-color .2s;
}

div.page-container[data-locked]:hover::before, div.cover-page-container[data-locked]:hover::before, div.back-page-container[data-locked]:hover::before {
    background-color: rgba(255, 255, 255, .6);
}

div.page-container[data-locked]::after, div.cover-page-container[data-locked]::after, div.back-page-container[data-locked]::after {
    position: absolute;
    top: 40%;
    left: 50%;
    z-index: 100;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    min-height: 44px;
    padding: 0 20px;
    transform: translateX(-50%);
    content: 'Page is locked - editing is restricted';
    border-radius: 8px;
    opacity: 0;
    font: 500 16px/1.1 Roboto;
    box-shadow: 5px 5px 20px rgba(0, 0, 0, .3);
    transition: opacity .2s;
    color: #fff;
    background-color: #868e96;
    cursor: pointer;
}

div.page-container[data-locked]:hover::after, div.cover-page-container[data-locked]:hover::after, div.back-page-container[data-locked]:hover::after {
    opacity: 1;
}

img.in-builder-drag-helper   {
    opacity: 0.5;
    border:1px  yellow dashed;
}

div.back-page-container {

}

html {
    transition: background-color 1000ms linear;
}

body {
    /*margin-left: 48px;*/
    /*margin-top: 47px;*/
    /*margin-bottom: 47px;*/
    /*
    margin: 47px auto;
    overflow-x: auto;
    transform-origin: left top;
    */
    display: flex;/* NOTE this flex value is read in ProjectDom.js , removing it will make the project never finishing loading */
    max-width: none !important;
    align-items: center;
    flex-direction: column;
    transform-origin: left top;
    overflow-x: auto;

}

.body-back-overlay {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    right: 0;
    content: '';
    z-index: 9000;
}

/*
body.zooming {
    max-width: none;
}

body.zooming > div {
    margin-left: auto;
    margin-right: auto;
}
*/

body.fullscreen {
    user-select: none;
}

body.fullscreen .project-anchor {
    opacity: 0;
}

body.fullscreen [data-locked] {
    outline: 0;
}

.fullscreen-overlay {
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    z-index: 9999;
    display: block !important;
    cursor: default !important;
}

.fullscreen-overlay::after {
    cursor: default;
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    content: '';
}

.sortable-selected-helper {
    outline: 2px solid #36a9e2
}

div.page-break-element {
    z-index: 999;
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 32px;
    line-height: 32px;
    background-color: rgba(54, 169, 226, 0.5);
    text-align: center;
    font-size: 12px;
    font-family: Roboto, serif;
    font-weight: normal;
    color: white;
    display: block;
}

/* pretty scroll */
html,
body {
    scrollbar-color: #949AA2 #eff0f1;
    scrollbar-width: thin;
    transition: scrollbar-color .3s;
}

body {
    height: 100%;
}

body::-webkit-scrollbar {
    background-color: #949AA2;
    transition: background-color .3s;
    width: 7px;
    height: 7px;
}

body::-webkit-scrollbar-thumb {
    background-color: #949AA2;
    transition: background-color .3s;
    border-radius: 3.5px;
}

body::-webkit-scrollbar-track {
    background-color: #eff0f1;
    transition: background-color .3s;
}

.move-cursor {
    cursor: move;
}

div.new-page-drop-after {
    margin-bottom: 74px !important;
    transition: margin-bottom 700ms;


    box-shadow: 0 60px 0 0 var(--editor-background-color),
    0 60px 0 0 white,
    0 72px 0 0 #36A9E2,
    0 512px 0 0 var(--editor-background-color),
    0 512px 0 0 white !important;
}

.navigator-page-wrapper .worksheet.empty-worksheet-page::after {
    display: none;
}

.worksheet.empty-worksheet-page:not([data-locked])::after {
    content: "A worksheet page contains exercises, questions, or after-reading activities. You can drag and drop worksheet elements from the left panel.";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: transparent;
    max-width: 250px;
    color: #3E434C;
    font-family: Roboto;
    font-weight: 400;
    background-image: url("../images/worksheets/empty_worksheet.svg");
    padding-top: 160px;
    background-repeat: no-repeat;
    background-size: 180px;
    background-position-x: center;
    line-height: 1.5;
    padding-left: 8px;
}

/* Side-by-side mode styles - CSS Grid approach */
body.side-by-side-mode {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: var(--column-gap, 16px);
    margin: 0 auto !important;
    padding: 20px;
    position: relative; /* For absolute positioning context */
}

/* Cover takes second column naturally after placeholder */
body.side-by-side-mode .cover-page-container {
    grid-column: 2;
    justify-self: start;
}

/* Placeholder for cover backside takes first column */
body.side-by-side-mode .cover-backside-placeholder {
    grid-column: 1;
    justify-self: end;
}

/* Content pages preserve exact dimensions */
body.side-by-side-mode .page-container {
    flex-shrink: 0; /* Preserve exact page dimensions */
}

/* Content pages in column 1 align right, column 2 align left */
body.side-by-side-mode .page-container:not(.cover-page-container):not(.cover-backside-placeholder):not(.last-page-backside-placeholder):not(.back-page-container):nth-child(odd) {
    justify-self: start;
}

body.side-by-side-mode .page-container:not(.cover-page-container):not(.cover-backside-placeholder):not(.last-page-backside-placeholder):not(.back-page-container):nth-child(even) {
    justify-self: end;
}

/* Prevent spine text elements from overflowing their parent */
.spine-element .spine-title,
.spine-element .spine-author {
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Bleeds support for side-by-side mode */
.side-by-side-mode .page-container:nth-child(even):not(.cover-page-container):not(.back-page-container),
.side-by-side-mode .page-container:nth-child(odd):not(.cover-page-container):not(.back-page-container),
.side-by-side-mode .cover-page-container,
.side-by-side-mode .back-page-container {
    position: relative;
}

/* Bleed lines for even pages (left pages) */
.side-by-side-mode .page-container:nth-child(even):not(.cover-page-container):not(.back-page-container)::before {
    content: '';
    position: absolute;
    top: var(--bleed-top);
    left: var(--bleed-left);
    right: var(--bleed-right);
    bottom: var(--bleed-bottom);
    border: 1px dashed var(--bleed-line-color, rgba(255, 0, 0, 0.8)) !important;
    border-spacing: 2px !important;
    pointer-events: none;
    z-index: 9999;
}

/* Bleed lines for odd pages (right pages) */
.side-by-side-mode .page-container:nth-child(odd):not(.cover-page-container):not(.back-page-container)::before {
    content: '';
    position: absolute;
    top: var(--bleed-top);
    left: var(--bleed-right);
    right: var(--bleed-left);
    bottom: var(--bleed-bottom);
    border: 1px dashed var(--bleed-line-color, rgba(255, 0, 0, 0.8)) !important;
    border-spacing: 2px !important;
    pointer-events: none;
    z-index: 9999;
}

/* Bleed lines for cover page */
.side-by-side-mode .cover-page-container::before {
    content: '';
    position: absolute;
    top: var(--bleed-top);
    left: var(--bleed-right);
    right: var(--bleed-left);
    bottom: var(--bleed-bottom);
    border: 1px dashed var(--bleed-line-color, rgba(255, 0, 0, 0.8)) !important;
    border-spacing: 2px !important;
    pointer-events: none;
    z-index: 9999;
}

/* Bleed lines for back page */
.side-by-side-mode .back-page-container::before {
    content: '';
    position: absolute;
    top: var(--bleed-top);
    left: var(--bleed-left);
    right: var(--bleed-right);
    bottom: var(--bleed-bottom);
    border: 1px dashed var(--bleed-line-color, rgba(255, 0, 0, 0.8)) !important;
    border-spacing: 2px !important;
    pointer-events: none;
    z-index: 9999;
}

/* Spine element styles */
.side-by-side-mode .spine-element {
    position: absolute;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    padding: 10px 5px;
}

.side-by-side-mode .spine-element .spine-title,
.side-by-side-mode .spine-element .spine-author {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    transform: rotate(180deg);
    text-align: center;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.side-by-side-mode .spine-element .spine-title {
    font-weight: bold;
}

/* Cover backside placeholder styles */
.side-by-side-mode .cover-backside-placeholder {
    background-color: #cccccc;
    flex-shrink: 0;
}

/* Last page backside placeholder styles */
.side-by-side-mode .last-page-backside-placeholder {
    background-color: #cccccc;
    flex-shrink: 0;
    border: 1px solid #aaa;
    box-sizing: border-box;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

/* Back cover positioning in side-by-side mode */
.side-by-side-mode .back-page-container.positioned {
    position: absolute !important;
    z-index: 2 !important;
}

/* Spine positioning in side-by-side mode */
.side-by-side-mode .spine-element.positioned {
    position: absolute !important;
    z-index: 2 !important;
}