iframe.header,
header {
    position: sticky;
    height: var(--header-start-height);
    width: 100%;
    z-index: 100;
}

iframe.header {
    top: 0;
    z-index: 100;
}

header {
    top: calc(var(--header-height-difference) * -1);
    display: flex;
    flex-flow: row no-wrap;
    align-items: center;
    background: var(--primary);
    z-index: 100;
}

header nav {
    position: sticky;
    height: var(--header-shrink-height);
    top: 0;
    width: 100%;
    padding: 0 1rem;
    display: flex;
    align-items: center;

    /* -webkit-backdrop-filter: blur(10px); */
    /* backdrop-filter: blur(10px); */

    color: var(--primary-text);
}

header nav ul {
    display: flex;
    justify-self: center;
    margin: auto;
    list-style: none;
}

header nav ul li {
    margin: 0 2em;

    text-transform: uppercase;
    font-weight: 700;
    font-size: 1.4rem;

    user-select: none;
}

header nav a {
    text-decoration: none;
    white-space: nowrap;

    color: var(--primary-text);
}

header nav a.logo img {
    height: 3rem;
}