@media screen {

    html, body {
        min-height: 100%;
    }

    body {
        margin: 0;
        font-size: 18px;
        font-family: 'PT Sans', Verdana, sans-serif;
        background: #ffffff;
        line-height: 1.4;
    }

    body.is-fullscreen {
        overflow: hidden;
    }

    /*** layout ***/

    .flex-wrapper {
        display: -webkit-box;
        display: -moz-box;
        display: -ms-flexbox;
        display: flexbox;
        display: -moz-flex;
        display: -o-flex;
        display: -webkit-flex;
        display: -ms-flex;
        display: flex;
        -moz-flex-wrap: wrap;
        -ms-flex-wrap: wrap;
        -o-flex-wrap: wrap;
        -webkit-flex-wrap: wrap;
        flex-wrap: wrap;
    }

    #page-wrap {
        position: relative;
    }

    /*** canvas ***/

    #canvas {
        position: fixed;
        top: 0;
        left: 0;
        height: 100vh;
        width: 100vw;
        z-index: 20;
        opacity: 0;
        transition: opacity 0.5s ease-in;
        pointer-events: none;
    }

    .planes-loaded #canvas {
        opacity: 1;
    }

    #back-to-lib-link {
        display: inline-block;
        position: fixed;
        top: 0;
        right: 0;
        padding: 0.25em 0.5em;
        background: #ee6557;
        color: white;
        text-decoration: none;
        z-index: 20;
        font-size: 0.85em;
    }

    #back-to-lib-link:hover {
        background: black;
    }

    #source-code-link {
        display: inline-block;
        position: fixed;
        bottom: 2em;
        right: 1em;
        padding: 0.25em 0.5em;
        background: #ee6557;
        color: white;
        text-decoration: none;
        z-index: 50;
    }

    #source-code-link:hover {
        background: black;
    }

    /*** close button ***/

    #close-button {
        position: fixed;
        top: 3.25em;
        right: 0;
        -webkit-appearance: none;
        border: 0;
        padding: 0.25em 0.5em;
        background: #ee6557;
        font: inherit;
        font-size: 0.85em;
        color: white;
        cursor: pointer;
        z-index: 50;

        display: none;
    }

    /*** content ***/

    #content {
        position: relative;
        z-index: 15;
        max-width: 1440px;
        margin: 0 auto;
        padding: 40px 0 0 0;
    }

    #planes {
        overflow: hidden;
        display: flex;
        flex-wrap: wrap;
        opacity: 0;
        margin: 15vh 0;

        transition: opacity 0.5s ease-in;
    }

    .planes-loaded #planes {
        opacity: 1;
    }

    .plane-wrapper {
        position: relative;

        width: 45%;
        height: 60vh;
        margin: 0 5% 0 0;
    }

    .plane-wrapper:nth-child(even) {
        margin: 15vh 0 0 5%;
    }

    .plane {
        position: absolute;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
        cursor: pointer;
    }

    body.is-fullscreen .plane {
        cursor: auto;
    }

    .plane img {
        display: none;
    }


    /*** handling errors ***/

    .no-curtains .plane-title {
        z-index: 1;
    }

    .no-curtains .plane {
        display: flex;
        overflow: hidden;
    }

    .no-curtains .plane img {
        display: block;
        min-width: 100%;
        min-height: 100%;
        object-fit: cover;
    }

}

@media screen and (max-width: 1320px) {

    #content {
        margin: 0 20px;
    }

}


@media screen and (max-width: 720px) {

    #content {
        margin: 0 10px;
    }

    .plane-wrapper {
        height: 75vh;
        width: 80%;
        margin: 7.5vh 10%;
    }

    .plane-wrapper:nth-child(even) {
        margin: 7.5vh 10%;
    }

}