/* the lightbox of lightbox.js: the image or video of a link on a dark, blurred overlay, that fades in
   and out. A dialog over the whole page, also while it fades out, after it has left the top layer */
#lightbox {
    position: fixed;
    inset: 0;
    z-index: 9999999;
    width: 100%;
    max-width: none;
    height: 100%;
    max-height: none;
    margin: 0;
    padding: 0;
    border: 0;
    background: rgba(0, 0, 0, .7);
    backdrop-filter: grayscale(1) blur(2px);
    color: #fff;
    font-family: sans-serif;
    cursor: pointer;
    -webkit-user-select: none;
    user-select: none;
    opacity: 0;
    transition: opacity .3s ease-in-out, display .3s allow-discrete;
}

#lightbox[open] {
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
}

@starting-style {
    #lightbox[open] {
        opacity: 0;
    }
}

#lightbox::backdrop {
    background: none;
}

/* at most 1200px */
#lightbox img {
    width: auto;
    height: auto;
    max-width: min(100%, 1200px);
    max-height: min(100%, 1200px);
}

#lightbox iframe {
    width: min(100%, 1200px);
    max-height: 100%;
    aspect-ratio: 16 / 9;
    border: 0;
    background: #000;
}

#lightbox #prev,
#lightbox #next {
    position: fixed;
    top: 50%;
    height: 50px;
    margin-top: -25px;
    padding: 0 15px;
    font-size: 60px;
    line-height: 36px;
}

#lightbox #prev {
    left: 0;
}

#lightbox #next {
    right: 0;
}

/* a white cross at the top right */
#lightbox #close {
    position: fixed;
    top: 0;
    right: 0;
    width: 50px;
    height: 50px;
}

#lightbox #close::before,
#lightbox #close::after {
    content: "";
    position: absolute;
    top: 22px;
    left: 14px;
    width: 23px;
    height: 2px;
    background: #fff;
    transform: rotate(-45deg);
}

#lightbox #close::after {
    transform: rotate(45deg);
}