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/**
 * This file is based on the HTML2print boilerplate.
 * 
 * 
 */


/**
 * 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 );

/* computes the width of a spread, which is twice the width of a single page */
@spread: @page-width * 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; 
    margin: 0;
}


/**
 * CANVAS
 */

@media all {
    body { margin: 0; }

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

        /* Crop marks */
        padding: @edge;

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

        /* utile ou non? pour éviter qu'un papier soit coupé par le format de la
        * page lors de la conversion et l'arrondis des unités */
        page-break-inside: avoid;
        page-break-after: always;
        overflow: hidden;

        /* Crop marks */
        background-image:
            -webkit-linear-gradient(90deg, black 0, black 100%),
            -webkit-linear-gradient(0deg, black 0, black 100%),
            -webkit-linear-gradient(90deg, black 0, black 100%),
            -webkit-linear-gradient(0deg, black 0, black 100%),
            -webkit-linear-gradient(90deg, black 0, black 100%),
            -webkit-linear-gradient(0deg, black 0, black 100%),
            -webkit-linear-gradient(90deg, black 0, black 100%),
            -webkit-linear-gradient(0deg, black 0, black 100%)
        ;
        background-size: 
            @crop-size 1px,
            1px @crop-size,
            @crop-size 1px,
            1px @crop-size,
            @crop-size 1px,
            1px @crop-size,
            @crop-size 1px,
            1px @crop-size
        ;
        background-position:
            left @edge,
            @edge top,
            right @edge,
            (@paper-width - @edge) top,
            right (@paper-height - @edge),
            (@paper-width - @edge) bottom,
            left (@paper-height - @edge),
            @edge bottom
        ;
        background-repeat: no-repeat;
    }

    .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;
        text-rendering: optimizeLegibility;
    }

    // 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 {
    body { background-color: #F0F0F0; }

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

        margin-left: auto;
        margin-right: auto;
    }
    .spread #pages {
        width: @paper-width * 2; 
        height: @paper-height * 2;
    }
    .paper {
        /* centrer la page à l'écran */
        background-color: white;
        margin-top: 1em;
        margin-bottom: 1em;
    }
    .normal .page { outline: 1px dashed lightsalmon; }
    .preview .paper { background: none; }
    .preview .page {
        outline: 1px solid lightgray;
        background-color: white;
    }
    .debug #story { outline: 1pt solid green; }
}


@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;
}
.debug .region-break { border-top: 1pt dashed blue; }