.site-opening {
    height: 100vh;
    width: 100%;
    background-color: var(--text-color);
    overflow: hidden;
    position: relative;
}

/* In dark mode --text-color is white, which flashes behind the header while the
   opening image fades in. Keep the loading backdrop dark in both themes. */
.dark .site-opening {
    background-color: var(--background-color);
}

.site-opening-images {
    opacity: 0;
}

.site-opening img {
    width: 100%;
    height: 100%;
}

.site-opening-background-image {
    width: 100%;
    height: calc(100% + 150px);
    position: absolute;
    background-size: cover;
    background-position: center;
}

.site-opening-menu {
    height: 100%;
    width: 100%;
    box-sizing: border-box;
    position: absolute;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    z-index: 10;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.site-opening-menu-container {
    display: flex;
    flex-direction: column;
}

.site-opening-menu-container .site-menu-element h2 {
    color: var(--text-on-image-color);
}

.site-opening-menu-container .site-menu-element-background {
    background-color: var(--text-on-image-color);
}

@media (hover) {
    .site-opening-menu-container .site-menu-element:not(.menu-currentpage):hover h2 {
        color: var(--text-color);
    }

    .site-opening-menu-container .site-menu-element:not(.menu-currentpage):hover .site-menu-element-background {
        background-color: var(--background-color);
    }
}

/* Fix the header from first paint on pages with the opening, so adding
   .header-siteopening (sticky -> fixed) never pulls it out of flow and shifts the page */
body:has(.site-opening) .header {
    position: fixed;
}

.header-siteopening {
    position: absolute;
    position: fixed;
}

.header-siteopening .header-logo-container {
    color: var(--text-on-image-color);
}

.header-siteopening .header-logo-container::before {
    background-color: var(--text-on-image-color);
}

.header-siteopening .menutoggle-container svg,
.header-siteopening .summarycart-container svg {
    fill: var(--text-on-image-color);
}

/* hover effects only on devices that can hover: a tap on iPad/iPhone would leave them stuck on */
@media (hover) {
    .header-siteopening .menutoggle-container:hover svg,
    .header-siteopening .summarycart-container:hover svg {
        fill: var(--background-on-image-color);
    }

    .header-siteopening .menutoggle-container:hover .menutoggle-icon-background,
    .header-siteopening .summarycart-container:hover .summarycart-icon-background {
        background-color: var(--text-on-image-color);
        transform: scale(1.25);
        opacity: 1;
        transition: transform .45s var(--easier), opacity .45s var(--easier);
    }
}

@media screen and (orientation:landscape) {
    .site-opening-menu-container {
        flex-direction: row;
    }
    
    .site-opening-menu-element a {
        transition: transform .35s var(--easier);
    }

    .site-opening-menu-element:not(.menu-currentpage):hover a {
        color: var(--text-color);
        transform: translateX(calc(var(--unit) * 4));
        transition: transform .35s var(--easier);
    }
    
    .site-opening-menu-element:not(.menu-currentpage):hover+* a,
    .site-opening-menu-element:not(.menu-currentpage):hover+*+* a,
    .site-opening-menu-element:not(.menu-currentpage):hover+*+*+* a,
    .site-opening-menu-element:not(.menu-currentpage):hover+*+*+*+* a {
        transform: translateX(calc(var(--unit) * 4));
        transition: transform .35s var(--easier);
    }

    .site-opening-menu-element:not(.menu-currentpage):hover .site-opening-menu-arrow {
        opacity: 1;
        left: 0;
        transition: left .35s var(--easier), opacity .35s var(--easier);
    }
}

.site-opening-contrast-layer {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    background-color: black;
    z-index: 1;
    opacity: var(--overlay-opacity);
    transition: opacity 2s ease;
}