/**
 * SNAPSMACK - Floating Gallery Engine
 *
 * 3D perspective gallery with zoom, smooth physics, and metadata display.
 */

:root {
    --wall-bg: #000;
}

body, html {
    margin: 0;
    padding: 0;
    background: var(--wall-bg) !important;
    overflow: hidden;
}

/* ── Viewport: full-screen container with perspective ──────────────── */
.wall-viewport {
    width: 100vw;
    height: 100vh;
    background: var(--wall-bg) !important;
    overflow: hidden;
    perspective: 1200px;
    display: flex;
    align-items: center;       /* centres the canvas band vertically */
    justify-content: flex-start; /* horizontal position controlled by JS transform */
    position: relative;
    touch-action: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* ── Canvas: CSS Grid, horizontal scroll via JS transform ──────────── */
.wall-canvas {
    display: grid;
    grid-template-rows: repeat(var(--wall-rows, 2), 1fr);
    grid-auto-flow: column;
    grid-auto-columns: min-content;
    height: 86vh;                  /* smaller than viewport so flex can centre it */
    row-gap: var(--wall-gap, 24px);
    column-gap: calc(var(--wall-gap, 24px) * 0.6);
    padding: 0 15vw;
    align-items: stretch;
    transform-style: preserve-3d;
    will-change: transform;
    background: transparent;
}

/* ── Tiles ──────────────────────────────────────────────────────────── */
.wall-tile {
    min-width: 80px;
    overflow: hidden;
    cursor: pointer;
    position: relative;
    transform-style: preserve-3d;
    pointer-events: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.4s cubic-bezier(0.165, 0.84, 0.44, 1), filter 0.4s ease;
}

.wall-tile:hover {
    transform: scale(1.05) translateZ(40px);
    z-index: 100;
}

.wall-tile.is-centered {
    z-index: 50;
}

.wall-tile img {
    height: 100%;
    width: auto;
    display: block;
    box-shadow: 0 20px 50px rgba(0,0,0,0.8);
    pointer-events: none;
    -webkit-user-drag: none;
    opacity: 0;
    transition: opacity 0.6s ease;
}

.wall-tile img.loaded {
    opacity: 1;
}

/* ── Zoom layer ────────────────────────────────────────────────────── */
#zoom-layer {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 999990;
    background: var(--wall-bg);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
}

#zoom-layer.active {
    opacity: 1;
    pointer-events: auto;
}

.zoom-clone {
    position: fixed;
    z-index: 999999;
    max-width: none !important;
    max-height: none !important;
    transition: transform 0.5s cubic-bezier(0.19, 1, 0.22, 1), opacity 0.3s ease;
    box-shadow: 0 40px 80px rgba(0,0,0,0.9);
    will-change: transform;
}

/* ── Mobile ────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
    .wall-canvas {
        height: 90vh;
        gap: 12px;
        padding: 0 10vw;
        --wall-rows: 1;
    }
}

/* ── Reflection effect (toggled via body.wall-reflect) ────────────── */
/* JS clones the canvas, flips it vertically, and syncs the transform
   each frame.  The reflection container is pinned to the bottom of the
   viewport with a gradient mask that fades it out.
   Pure JS + CSS — works in Chrome, Firefox, Safari, Edge, Brave. */
.wall-reflection {
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 25vh;
    overflow: hidden;
    pointer-events: none;
    transform-style: preserve-3d;
    perspective: 1200px;
    z-index: 0;
    -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,0.30) 0%, transparent 80%);
            mask-image: linear-gradient(to bottom, rgba(0,0,0,0.30) 0%, transparent 80%);
}
.wall-reflection .wall-canvas {
    position: absolute;
    top: 0;
    left: 0;
    transform-origin: top center;
    /* JS composes: scaleY(-1) translate3d(...) rotateY(...) */
    height: 86vh;
    opacity: 0.4;
}

/* ── Infinite scroll sentinel ──────────────────────────────────────── */
#wall-sentinel {
    width: 1px;
    height: 1px;
    align-self: start;
    pointer-events: none;
}