body {
    height: 100vh;
    display: grid;
    grid-template-columns: 11fr 1fr;
    grid-template-rows: auto 1fr auto;
    margin: 0;
    background-color: #acf;
}

header.banner {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 3fr 8fr 1fr;
    align-items: center;
}

header.banner .brand {
    grid-column: 1;
    padding-left: 2vw;
    padding-right: 2vw;
}

header.banner .brand a {
    display: flex;
    align-items: center;
    text-decoration: none;
}

header.banner .brand img {
    transition: filter 1s;
}
header.banner .brand h1 {
    transition: color 1s;
}
header.banner .brand:hover img {
    filter: brightness(100%) sepia(100%);
}
header.banner .brand:hover h1 {
    color: #d82;
}

.brand h1 {
    margin: 0;
}

.brand img {
    height: 3em;
    filter: brightness(0%);
}

nav {
    grid-column: 2;
    padding-right: 2vw;
}

nav > ol {
    display: flex;
    align-items: center;
    align-content: stretch;
    flex-wrap: wrap;
    padding-left: 0;
    text-align: center;
    list-style-type: none;
}

nav > ol > li {
    flex: 1;
    padding: 0.5em 0.1em;
}

nav li.dropdown {
    position: relative;
}
nav li.dropdown ul {
    display: none;
    position: absolute;
    left: 0;                    /* Offset nav > ol > li padding. */
    padding-left: 0;
    width: 100%;
    text-align: left;
    background: lightgrey;
    z-index: 1;

    /* TODO: transition? ⚠ display: block */

    /* overflow: hidden; */
    /* max-height: 0; */
    /* transition: max-height 0.5s; */

    /* transform: scaleY(0); */
    /* transform-origin: top; */
    /* transition: transform 0.5s; */

}
nav li.dropdown:hover ul {
    display: block;
    /* TODO: transition? ⚠ redundant display: block */
    /* max-height: 100vh; */
    /* transform: scaleY(1); */
}
nav li.dropdown > ul > li {
    list-style-type: none;
}
nav li.dropdown > ul > li:hover {
    background: white;
}
nav li.dropdown > ul > li a {
    display: block;       /* Make link span whole containing block. */
    padding-inline-start: 10%;
}
nav li.dropdown > ul > li a img {
    width: 32px;
    height: 32px;
}


.current {
    background-color: white;
}

nav ol li a {
    text-decoration: none;
}

.lang {
    grid-column: 3;
    background-color: black;
    border-radius: 50% 50% 50% 0;
    color: white;
    padding: 0.5em;
    margin: auto;
}

main {
    grid-row: 2;
    grid-column: 1;
    padding-left: 4%;
    overflow: auto;
}

footer.social {
    grid-row: 2;
    grid-column: 2;

    display: flex;
    flex-direction: column;
    align-items: center;
    position: sticky;
    top: 0;
}

.social img {
    width: 2em;
    margin-top: 0.5em;
    margin-bottom: 0.5em;
}

.contact {
    /* Ideally should be just: */
    /* writing-mode: sideways-lr; */
    /* but of course We Can't Have Nice Things. */
    writing-mode: vertical-rl;
    transform: rotate(180deg);

    margin: 0;
    padding: 1em 0.5em;
}

.contact a {
    text-decoration: none;
}

footer.legal {
    grid-column: 1 / -1;
    width: 100%;
    text-align: center;
    margin: auto;
    font-size: 75%;
}

header a, footer a {
    color: inherit;
}