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/**
 * Computation
 */


/* computes the edge size of the paper, which is the sum of the bleed and the
 * crop sizes */
@edge: @crop-size + @bleed; 

    /* Computes the size of the paper sheet */
@paper-width: @page-width + ( @edge * 2 );
@paper-height: @page-height + ( @edge * 2 );

/**
 * DEFINITION OF THE PAPER SHEET
 */

/** 
 * The @page CSS at-rule is used to define some properties of printed
 * documents. We make it the size of the elements with the .paper class and
 * remove any margins so they don't add up with margins specifed in elements
 * with the .page class (or it's children, like .header, .body and .footer)
 */
@page {
    size: @paper-width (@paper-height + 1); 
    margin: 0;
}


/**
 * CANVAS
 */

@media all {
    body { 
        margin: 0;

        /* Activate opentype features and kernings */
        -webkit-font-feature-settings: "liga", "dlig", "clig", "kern";
        text-rendering: optimizeLegibility;
    }

    .paper {
        width: @paper-width; 
        height: @paper-height;
        box-sizing: border-box;

        /* defines a named counter and increments it every page, so we can use
         * it to compute the page number */
        counter-increment: page-counter;

        /* makes sure that pages aren't cut because of pootential unprecise unit
         * conversion at printing time */
        page-break-inside: avoid;
        page-break-after: always;

        /* clips the content if it goes out of the page, so it doesn't increase
         * the format */
        overflow: hidden;

        /* Crop marks */
        padding: @edge;
        position: relative;
    }

    .paper .crops {
        width: @paper-width; 
        height: @paper-height;
        position: absolute;
        top: 0;
        left: 0;

    }
    .paper .crops div {
        border-style: solid;
        border-color: black;
        border-width: 0;
        width: @edge;
        height: @edge;
        position: absolute;
        box-sizing: border-box;
    }
    .paper .crops div span {
        width: @bleed;
        height: @bleed;
        background-color: white;
        position: absolute;
    }
    .paper .crops .crop-top-left {
        border-right-width: 1px;
        border-bottom-width: 1px;
        top: 0;
        left: 0;
    }
    .paper .crops .crop-top-left span { right: -1px; bottom: -1px;}
    .paper .crops .crop-top-right {
        border-left-width: 1px;
        border-bottom-width: 1px;
        top: 0;
        right: 0;
    }
    .paper .crops .crop-top-right span { left: -1px; bottom: -1px;}
    .paper .crops .crop-bottom-right {
        border-left-width: 1px;
        border-top-width: 1px;
        right: 0;
        bottom: 0;
    }
    .paper .crops .crop-bottom-right span { left: -1px; top: -1px;}
    .paper .crops .crop-bottom-left {
        border-right-width: 1px;
        border-top-width: 1px;
        left: 0;
        bottom: 0;
    }
    .paper .crops .crop-bottom-left span { right: -1px; top: -1px;}

    .page {
        /* defines the page size */
        width: @page-width;
        height: @page-height;

        /* allows for absolutely positioned elements as settings the position
         * property to relative as the side effect of making this elements
         * top-left corner the reference point */
        position: relative;
    }

    // TODO: changer le format du papier en spread pour pouvoir imprimer en planche
    .spread .paper { float: left; }
    .spread .paper:nth-child(odd) { margin-left: -@edge; }
    .spread .paper:nth-child(even) { margin-right: -@edge; }
    .spread .paper:first-child { margin-left: @page-width; }
}

@media screen {
    /* defines the background color of the workspace */
    /* UI */
    body { background-color: #F0F0F0; }

    #pages {
        width: @paper-width; 
        height: @paper-height;

        margin-left: auto;
        margin-right: auto;
    }
    /* FIXME: allows for printing spreads as well */
    .spread #pages {
        width: @paper-width * 2; 
        height: @paper-height * 2;
    }
    .paper {
        /* centrer la page à l'écran */
        /* UI */
        background-color: white;
        /* UI */
        margin-top: 1em;
        /* UI */
        margin-bottom: 1em;
    }
    /* UI */
    .normal .page { outline: 1px dotted lightsalmon; }
    /* UI */
    .preview .paper { background: none; }
    /* UI */
    .preview .page {
        outline: 1px solid lightgray;
        background-color: white;
    }
}


@media print {
    html { width: @paper-width; }
    body {
        /* Allows for background colors printing */
        background-color: white;
        -webkit-print-color-adjust: exact;
                print-color-adjust: exact;
    }
}

/**
 * Helpers
 */

.region-break {
    /* Apply this class to an element to put it on a new region.
     * Hint: 
     * You can also use an empty <div class="page-break"></div> 
     * if you want to put manual page breaks without attaching it to an HTML element
     */
    -webkit-region-break-before: always;
}