/* Photo gallery (about page) */

.gallery {
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
}

/* Tile grid: 2 columns on phones, 3 on tablets, 4 on larger screens */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

@media (min-width: 600px) {
    .gallery-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 900px) {
    .gallery-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.gallery-tile {
    display: block;
    box-sizing: border-box;
    aspect-ratio: 9 / 16; /* matches a vertical phone screen */
    overflow: hidden;
    border: 3px solid black;
    border-radius: 50% / 40px; /* arched top and bottom */
    background-color: beige; /* shows while a thumbnail is loading */
}

.gallery-tile img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.35s ease;
}

@media (hover: hover) {
    .gallery-tile:hover img {
        transform: scale(1.06);
    }
}

.gallery-tile:focus-visible {
    outline: 3px solid #fff;
    outline-offset: 2px;
}

/* Lightbox (built by gallery.js) */
html.lb-open {
    overflow: hidden;
    overscroll-behavior: none; /* a sideways swipe must not trigger the browser's back gesture */
}

.lightbox {
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    max-width: none;
    max-height: none;
    margin: 0;
    padding: 0;
    border: 0;
    background: rgba(0, 0, 0, 0.92);
    color: #fff;
    touch-action: pan-y pinch-zoom; /* horizontal swipes belong to gallery.js */
    overscroll-behavior: none;
}

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

.lightbox::backdrop {
    background: rgba(0, 0, 0, 0.92);
}

.lb-figure {
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 100%;
    margin: 0;
}

.lb-img {
    display: block;
    max-width: 100vw;
    max-height: calc(100vh - 56px);
    max-height: calc(100dvh - 56px);
    object-fit: contain;
    transition: opacity 0.2s ease;
}

.lb-img.lb-loading {
    opacity: 0.3;
}

.lb-count {
    padding-top: 10px;
    font-family: Arial, sans-serif;
    font-size: 14px;
    line-height: 1;
    color: #ddd;
}

.lb-btn {
    position: absolute;
    width: 48px;
    height: 48px;
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.18);
    color: #fff;
    font-size: 30px;
    line-height: 1;
    cursor: pointer;
}

.lb-btn:hover,
.lb-btn:focus-visible {
    background: rgba(255, 255, 255, 0.35);
}

.lb-close {
    top: max(12px, env(safe-area-inset-top));
    right: max(12px, env(safe-area-inset-right));
}

.lb-prev,
.lb-next {
    top: 50%;
    transform: translateY(-50%);
}

.lb-prev {
    left: max(12px, env(safe-area-inset-left));
}

.lb-next {
    right: max(12px, env(safe-area-inset-right));
}

@media (prefers-reduced-motion: reduce) {
    .gallery-tile img,
    .lb-img {
        transition: none;
    }
}