/* =========================================================================
   AmazingDens — the gallery block
   Filter chips, CSS-columns masonry grid, and the lightbox. The block can
   sit on any page, so this is loaded site-wide.
   Design tokens + layout primitives come from shared.css.
   ========================================================================= */

/* -------------------------------------------------------------------------
   Hero (smaller than home hero — no background image)
   ------------------------------------------------------------------------- */
.gallery-hero {
    padding-top: calc(var(--header-h) + var(--sp-9));
    padding-bottom: var(--sp-6);
    border-bottom: 1px solid var(--border);
}

/* -------------------------------------------------------------------------
   Filter chips
   ------------------------------------------------------------------------- */
.gallery-filters {
    position: sticky;
    top: var(--header-h);
    z-index: 10;
    padding-block: var(--sp-3);
    background: rgba(39, 39, 39, 0.86);
    backdrop-filter: blur(14px) saturate(140%);
    -webkit-backdrop-filter: blur(14px) saturate(140%);
    border-bottom: 1px solid var(--border);
}

.filter-toggle {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-3);
    padding: 0.55rem 1rem;
    font-family: var(--font-ui);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--ink);
    background: transparent;
    border: 1px solid var(--border-strong);
    border-radius: 999px;
    cursor: pointer;
    transition: border-color var(--dur-fast) var(--ease-out);
}

.filter-toggle:hover {
    border-color: rgba(249, 249, 249, 0.35);
}

.filter-toggle__label {
    color: var(--ink-muted);
}

.filter-toggle__current {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
}

.filter-toggle__chevron {
    width: 0.5rem;
    height: 0.5rem;
    margin-top: -0.25rem;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    transform: rotate(45deg);
    transition: transform var(--dur-base) var(--ease-out), margin var(--dur-base) var(--ease-out);
}

.filter-toggle[aria-expanded="true"] .filter-toggle__chevron {
    margin-top: 0.25rem;
    transform: rotate(-135deg);
}

/* The panel slides open by animating its grid row from 0fr to 1fr, which
   needs no fixed height and clips cleanly while closed. */
.filter-panel {
    display: grid;
    grid-template-rows: 0fr;
    opacity: 0;
    transition: grid-template-rows var(--dur-base) var(--ease-out), opacity var(--dur-base) var(--ease-out);
}

.filter-panel > .chip-row {
    min-height: 0;
    overflow: hidden;
}

.filter-panel.is-open {
    grid-template-rows: 1fr;
    opacity: 1;
}

.filter-panel.is-open > .chip-row {
    padding-top: var(--sp-4);
}

.chip-row {
    display: flex;
    flex-wrap: wrap;
    gap: var(--sp-3);
}

.chip {
    --chip-bg: transparent;
    --chip-border: var(--border-strong);
    --chip-color: var(--ink-muted);

    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
    padding: 0.55rem 1.1rem;
    font-family: var(--font-ui);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    color: var(--chip-color);
    background: var(--chip-bg);
    border: 1px solid var(--chip-border);
    border-radius: 999px;
    cursor: pointer;
    transition: background var(--dur-fast) var(--ease-out),
                color var(--dur-fast) var(--ease-out),
                border-color var(--dur-fast) var(--ease-out),
                transform var(--dur-fast) var(--ease-out);
}

.chip:hover {
    --chip-color: var(--ink);
    --chip-border: rgba(249, 249, 249, 0.35);
}

.chip.is-active {
    --chip-bg: var(--accent);
    --chip-color: var(--ink);
    --chip-border: var(--accent);
}

.chip.is-active:hover {
    --chip-bg: var(--accent-soft);
    --chip-border: var(--accent-soft);
}

.chip__count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1.6rem;
    height: 1.2rem;
    padding-inline: 0.35rem;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0;
    background: rgba(249, 249, 249, 0.08);
    border-radius: 999px;
    color: var(--ink-muted);
    transition: background var(--dur-fast) var(--ease-out),
                color var(--dur-fast) var(--ease-out);
}

.chip.is-active .chip__count {
    background: rgba(28, 28, 28, 0.4);
    color: var(--ink);
}

/* -------------------------------------------------------------------------
   Masonry grid (CSS columns)
   ------------------------------------------------------------------------- */
.gallery-section {
    padding-block: var(--sp-8) var(--sp-7);
    /* Do not let the browser re-anchor the page against the grid when the
       filter panel above it expands: that shift read as a scroll. */
    overflow-anchor: none;
}

.gallery-grid {
    column-count: 2;             /* two columns from the smallest phone up */
    column-gap: var(--sp-4);
}

@media (min-width: 900px) {
    .gallery-grid { column-count: 3; column-gap: var(--sp-5); }
}
@media (min-width: 1500px) {
    .gallery-grid { column-count: 4; }
}

.gallery-item {
    break-inside: avoid;
    margin: 0 0 var(--sp-5);
    display: block;
    opacity: 1;
    transition: opacity var(--dur-base) var(--ease-out),
                transform var(--dur-base) var(--ease-out);
}

.gallery-item.is-hidden {
    display: none;
}

.gallery-item__button {
    position: relative;
    display: block;
    width: 100%;
    padding: 0;
    background: var(--bg-raised);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    cursor: zoom-in;
    color: inherit;
    transition: border-color var(--dur-base) var(--ease-out),
                transform var(--dur-base) var(--ease-out);
}

.gallery-item__button:hover {
    border-color: var(--border-strong);
    transform: translateY(-3px);
}

.gallery-item__button img {
    display: block;
    width: 100%;
    height: auto;
    transition: transform var(--dur-slow) var(--ease-out);
}

.gallery-item__button:hover img {
    transform: scale(1.03);
}

.gallery-item__caption {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    padding: var(--sp-6) var(--sp-4) var(--sp-4);
    color: var(--ink);
    font-family: var(--font-ui);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    text-align: left;
    background: linear-gradient(180deg, rgba(28, 28, 28, 0) 0%, rgba(28, 28, 28, 0.85) 100%);
    opacity: 0;
    transform: translateY(8px);
    transition: opacity var(--dur-base) var(--ease-out),
                transform var(--dur-base) var(--ease-out);
    pointer-events: none;
}

.gallery-item__button:hover .gallery-item__caption,
.gallery-item__button:focus-visible .gallery-item__caption {
    opacity: 1;
    transform: translateY(0);
}

/* -------------------------------------------------------------------------
   Lightbox
   ------------------------------------------------------------------------- */
.lightbox[hidden] {
    display: none !important;
}

.lightbox {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: grid;
    place-items: center;
    padding: var(--sp-5);
    background: rgba(12, 12, 12, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    animation: lightbox-fade var(--dur-base) var(--ease-out);
}

@keyframes lightbox-fade {
    from { opacity: 0; }
    to   { opacity: 1; }
}

.lightbox__stage {
    max-width: min(90vw, 1200px);
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    gap: var(--sp-4);
    align-items: center;
    margin: 0;
}

.lightbox__stage img {
    max-width: 100%;
    max-height: 78vh;
    width: auto;
    height: auto;
    object-fit: contain;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    background: var(--bg-raised);
}

.lightbox__stage figcaption {
    font-family: var(--font-ui);
    font-size: 0.92rem;
    color: var(--ink-muted);
    text-align: center;
    letter-spacing: 0.02em;
}

.lightbox__close,
.lightbox__nav {
    position: absolute;
    width: 3rem;
    height: 3rem;
    display: grid;
    place-items: center;
    font-family: var(--font-display);
    font-size: 1.8rem;
    line-height: 1;
    color: var(--ink);
    background: rgba(28, 28, 28, 0.72);
    border: 1px solid var(--border-strong);
    border-radius: 50%;
    cursor: pointer;
    transition: background var(--dur-fast) var(--ease-out),
                transform var(--dur-fast) var(--ease-out);
}

.lightbox__close:hover,
.lightbox__nav:hover {
    background: var(--accent);
}

.lightbox__close {
    top: var(--sp-5);
    right: var(--sp-5);
}

.lightbox__nav--prev { left: var(--sp-5); top: 50%; transform: translateY(-50%); }
.lightbox__nav--next { right: var(--sp-5); top: 50%; transform: translateY(-50%); }

.lightbox__nav--prev:hover { transform: translateY(-50%) translateX(-2px); }
.lightbox__nav--next:hover { transform: translateY(-50%) translateX(2px); }

/* Prevent scroll on the body while lightbox is open. */
body.is-lightbox-open {
    overflow: hidden;
}

/* Narrow screens: match the tighter rhythm shared.css gives .page-hero */
@media (max-width: 720px) {
    .gallery-hero {
        padding-top: calc(var(--header-h) + var(--sp-7));
        padding-bottom: var(--sp-5);
    }

    /* Room under the last row for the floating filter pill. */
    .gallery-section { padding-block: var(--sp-6) var(--sp-8); }
}

/* -------------------------------------------------------------------------
   Phones: the filter is a floating button at the bottom of the screen, and
   the categories open as a bottom sheet above it. The sticky bar under the
   title disappears; desktop keeps it.
   ------------------------------------------------------------------------- */
@media (max-width: 720px) {
    .gallery-filters {
        position: static;
        padding: 0;
        background: none;
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        border: 0;
    }

    .filter-toggle {
        position: fixed;
        left: 50%;
        bottom: calc(1rem + env(safe-area-inset-bottom, 0px));
        transform: translateX(-50%);
        z-index: 30;
        /* A fixed element centred with left:50% only gets half the viewport
           to size itself, and a longer category name wrapped the pill. */
        white-space: nowrap;
        max-width: calc(100vw - 2rem);
        padding: 0.8rem 1.25rem;
        font-size: 0.9rem;
        color: var(--ink);
        background: var(--accent);
        border-color: var(--accent);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
    }

    .filter-toggle__label {
        color: rgba(249, 249, 249, 0.8);
    }

    .filter-toggle .chip__count {
        background: rgba(28, 28, 28, 0.4);
        color: var(--ink);
    }

    body.is-lightbox-open .filter-toggle {
        display: none;
    }

    .filter-panel {
        position: fixed;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 25;
        display: block;
        max-height: 70vh;
        overflow: auto;
        padding: var(--sp-5) var(--gutter) calc(5rem + env(safe-area-inset-bottom, 0px));
        background: rgba(39, 39, 39, 0.97);
        border-top: 1px solid var(--border);
        border-radius: 1.25rem 1.25rem 0 0;
        box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.5);
        opacity: 1;
        visibility: hidden;
        transform: translateY(100%);
        transition: transform var(--dur-base) var(--ease-out), visibility 0s var(--dur-base);
    }

    .filter-panel > .chip-row,
    .filter-panel.is-open > .chip-row {
        overflow: visible;
        padding-top: 0;
    }

    .filter-panel.is-open {
        visibility: visible;
        transform: translateY(0);
        transition: transform var(--dur-base) var(--ease-out), visibility 0s;
    }
}