/* Photo carousels -- see scripts/galleryTag.js for the {% gallery %} tag.
   Black frame, photo contained inside it, chevrons out in the letterbox,
   one dot per photo over the bottom, per-photo caption underneath. */

.gallery {
    margin: 1.8em 0;
}

.gallery-viewport {
    position: relative;
    aspect-ratio: 16 / 9;
    /* no plate behind the photo: whatever the shot's proportions, the space
       around it is just page background. The frame still keeps one fixed
       shape so paging between portrait and landscape doesn't jump. */
    background: transparent;
    overflow: hidden;
}

.gallery-track {
    list-style: none;
    margin: 0;
    padding: 0;
    height: 100%;
}

.gallery-slide {
    position: absolute;
    inset: 0;
    margin: 0;
    opacity: 0;
    transition: opacity 0.35s ease;
    pointer-events: none;
}

.gallery-slide[data-active="true"] {
    opacity: 1;
    pointer-events: auto;
}

.gallery-slide img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

/* ---- controls ---- */

.gallery-viewport button {
    position: absolute;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    border: none;
    background: none;
    /* the controls can land on the page or on the photo itself, so they
       take the page's text colour and carry a halo for the second case */
    color: rgba(0, 0, 0, 0.55);
    filter: drop-shadow(0 0 2px rgba(255, 255, 255, 0.8));
    cursor: pointer;
    transition: color 0.2s ease, opacity 0.2s ease;
}

.dark-theme .gallery-viewport button {
    color: rgba(255, 255, 255, 0.75);
    filter: drop-shadow(0 0 2px rgba(0, 0, 0, 0.8));
}

.gallery-viewport button:hover {
    color: rgba(0, 0, 0, 0.9);
}

.dark-theme .gallery-viewport button:hover {
    color: #fff;
}

.gallery-viewport button svg {
    width: 100%;
    height: 100%;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.6;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.gallery-nav {
    top: 50%;
    transform: translateY(-50%);
    width: 2.6rem;
    height: 3.4rem;
}

.gallery-prev {
    left: 0.75rem;
}

.gallery-next {
    right: 0.75rem;
}

.gallery-fullscreen {
    right: 0.9rem;
    bottom: 0.9rem;
    width: 1.5rem;
    height: 1.5rem;
}

/* ---- dots ---- */

.gallery-dots {
    position: absolute;
    left: 50%;
    bottom: 0.9rem;
    transform: translateX(-50%);
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.55rem;
    max-width: 70%;
}

/* scoped past `.gallery-viewport button`, which would otherwise win on
   specificity and strip the fill off every inactive dot */
.gallery-viewport .gallery-dot {
    position: static;
    width: 8px;
    height: 8px;
    padding: 0;
    border: none;
    border-radius: 50%;
    /* inactive dots are a translucent white, the current one solid */
    background: rgba(255, 255, 255, 0.55);
    transition: background 0.2s ease;
}

.gallery-viewport .gallery-dot:hover {
    background: rgba(255, 255, 255, 0.8);
}

.gallery-viewport .gallery-dot.is-active {
    background: #fff;
}

/* ---- caption ---- */

/* every photo has its own caption element; only the current one shows.
   The block holds its height so paging between a captioned and an
   uncaptioned photo doesn't shift the page. */
.gallery-captions {
    position: relative;
    margin-top: 0.7em;
    min-height: 1.6em;
}

.gallery-caption {
    margin: 0;
    font-size: 0.9em;
    line-height: 1.6;
    text-align: center;
    opacity: 0.75;
    display: none;
}

.gallery-caption[data-active="true"] {
    display: block;
}

/* one photo has nothing to page through */
.gallery.is-single .gallery-nav,
.gallery.is-single .gallery-dots {
    display: none;
}

/* ---- fullscreen ---- */

.gallery-viewport:fullscreen {
    aspect-ratio: auto;
    width: 100vw;
    height: 100vh;
}

@media screen and (max-width: 1023px) {
    .gallery-viewport {
        aspect-ratio: 4 / 3;
    }

    .gallery-nav {
        width: 2rem;
        height: 2.6rem;
    }

    .gallery-prev {
        left: 0.35rem;
    }

    .gallery-next {
        right: 0.35rem;
    }
}