.header {
    width: 100%;
    overflow: hidden;
    transition: height .5s;
    display: flex;
    flex-direction: column;
    color: var(--header-text-colour);
}

.header-background {
    position: absolute;
    top: 0;
    bottom: 0;
    right: 0;
    left: 0;
    overflow: hidden;
}
.header-background img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scale(1.3);
    filter: brightness(0.6) blur(12px);
}

.header-forehead {
    height: 150px;
    flex-shrink: 0;
    flex-grow: 0;
}

.header-foreground {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    background-color: #0005;
    flex-shrink: 0;
    flex-grow: 0;
    text-shadow: 0 0 1px #000;
}

.header-main {
    width: 100%;
    max-width: calc(var(--site-max-width, 100%) + var(--global-spacing-1-5x));
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 var(--global-spacing-1-5x);
}

.header-logo {
    font-family: var(--font-header);
    color: transparent;
    text-decoration: none;
    display: flex;
    flex-grow: 0;
    flex-shrink: 0;
    font-size: 2em;
    line-height: 1.5em;
    flex-shrink: 0;
    flex-grow: 0;
    margin: var(--global-spacing-0-5x);
}
.header-flash {
    color: var(--logo-part1-colour);
    white-space: pre;
}
.header-wave {
    color: var(--logo-part2-colour);
    white-space: pre;
}

.header-nav {
    display: flex;
    flex-wrap: wrap;
    flex-shrink: 1;
    flex-grow: 0;
    justify-content: flex-end;
    gap: var(--global-spacing);
    max-width: 700px;
}
.header-nav a {
    display: block;
    color: inherit;
    text-decoration: none;
    font-size: 1.2em;
    line-height: 1.4em;
    padding: var(--global-spacing-2x);
    transition: background-color .1s;
}
.header-nav a:hover,
.header-nav a:focus {
    background-color: #fff1;
}
.header-nav a:active {
    background-color: #0005;
}

.header-sub {
    width: 100%;
    background-color: #0005;
    display: flex;
    justify-content: center;
    padding: 0 var(--global-spacing-1-5x);
}

.header-breadcrumbs {
    width: 100%;
    max-width: var(--site-max-width, 100%);
    display: flex;
    align-items: center;
    font-size: .9em;
    line-height: 1.5em;
}
.header-breadcrumbs-sep {
    padding: 0 var(--global-spacing);
}
.header-breadcrumbs-link {
    display: block;
    color: inherit;
    text-decoration: none;
    padding: 0 var(--global-spacing);
    transition: background-color .1s;
}
.header-breadcrumbs-link:hover,
.header-breadcrumbs-link:focus {
    background-color: #fff1;
}
.header-breadcrumbs-link:active {
    background-color: #0005;
}

@media (max-width: 900px) {
    .header-forehead {
        display: none;
    }

    .header-main {
        flex-direction: column;
    }

    .header-nav {
        justify-content: center;
        max-width: initial;
    }
}