:root {
    --viewer-nav-visibility: hidden;
}

.page {
    max-inline-size: 1024px;
    margin: 0 auto;
    font:
        1.2em Graphik,
        arial,
        sans-serif;
}

.header {
    padding-top: 20px;
}

.header img {
    width: 203px;
    height: 63px;
    margin: auto;
}

.divider {
    height: 1px;
    width: 80%;
}

.side {
    display: box;
}

.side img {
    border: 0;
    margin: 0;
    padding: 0;
    width: 100%;
}

.content {
    padding: 20px;
}

nav ul {
    display: flex;
    justify-content: space-around;
    list-style: none;
    padding: 10px;
    visibility: var(--viewer-nav-visibility);
}

nav ul li {
    cursor: pointer;
    width: 30%;
}

.header {
    grid-area: header;
}

.content {
    grid-area: content;
}

.viewer-nav {
    grid-area: nav;
}

.divider {
    grid-area: divider;
}

.side {
    grid-area: sidebar;
}

.page {
    display: grid;
    justify-items: center;
    align-items: center;
    gap: 0px;
    grid-template-areas:
        "header"
        "sidebar"
        "nav"
        "divider"
        "content"
}

@media (min-width: 500px) {
    .page {
        grid-template-columns: 2fr 5px 1fr;
        grid-template-areas:
            "header header header"
            "sidebar divider content"
            "nav nav nav";
    }

    .divider {
        width: 1px;
        height: 90%;
    }

    nav ul {
        display: flex;
        justify-content: space-around;
    }
}

.close-button {
    filter: invert(1);
    mix-blend-mode: difference;
    cursor: pointer;
    position: fixed;
    top: 20px;
    right: 20px;
    width: 100px;
    z-index: 10;
}