:root {
    --spread-main-left: calc(100% - var(--spread-main-width) - clamp(22px, 2.8vw, 42px));
    --spread-main-width: 76vw;
    --spread-main-top: 3%;
    --spread-main-height: calc(100% - 18px);
    --spread-middle-left: clamp(78px, 10.5vw, 160px);
    --spread-middle-width: clamp(245px, 31vw, 470px);
    --spread-middle-top: 3%;
    --spread-middle-height: calc(100% - 42px);
    --spread-left-left: clamp(22px, 3.5vw, 54px);
    --spread-left-width: clamp(145px, 17vw, 260px);
    --spread-left-top: 3%;
    --spread-left-height: calc(100% - 72px);
}

.scene-spread {
    position: relative;
    isolation: isolate;
    overflow: hidden;
    width: 100%;
    height: 80vh;
    min-height: 560px;
    max-height: 800px;
    background: #f4f0e8;
    border-top: 1px solid rgba(27, 24, 20, .14);
    border-bottom: 1px solid rgba(27, 24, 20, .14);
}

.scene-spread::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    background:
        linear-gradient(113deg, transparent 0 49.7%, rgba(111, 79, 37, .08) 50%, transparent 50.3%),
        radial-gradient(circle at 52% 50%, rgba(213, 177, 104, .13), transparent 52%);
}

.spread-pages {
    position: absolute;
    inset: 0;
    overflow: hidden;
    touch-action: pan-y;
}

.spread-track {
    position: relative;
    width: 100%;
    height: 100%;
    will-change: transform;
}

.spread-page {
    position: absolute;
    top: var(--spread-page-top, 3%);
    left: var(--spread-page-left, auto);
    margin: 0;
    overflow: hidden;
    background: #211e19;
    border: 1px solid rgba(103, 73, 32, .34);
    box-shadow: 0 28px 60px rgba(49, 33, 15, .24);
    transition:
        left .65s cubic-bezier(.22, 1, .36, 1),
        top .65s cubic-bezier(.22, 1, .36, 1),
        width .65s cubic-bezier(.22, 1, .36, 1),
        height .65s cubic-bezier(.22, 1, .36, 1),
        transform .65s cubic-bezier(.22, 1, .36, 1),
        opacity .65s cubic-bezier(.22, 1, .36, 1);
    will-change: left, top, width, height, transform, opacity;
}

.spread-page img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    user-select: none;
    -webkit-user-drag: none;
}

.spread-page::after {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: linear-gradient(90deg, rgba(0, 0, 0, .16), transparent 17%, transparent 83%, rgba(0, 0, 0, .28));
}

.spread-page-main {
    left: var(--spread-main-left);
    width: var(--spread-main-width);
    top: var(--spread-main-top);
    height: var(--spread-main-height);
    opacity: 1;
    filter: brightness(.95) saturate(.88);
    z-index: 5;
    transform: translate3d(var(--spread-main-drag-x, 0px), 0, 0) scale(var(--spread-main-scale, 1));
}

.spread-page-middle {
    left: var(--spread-middle-left);
    width: var(--spread-middle-width);
    top: var(--spread-middle-top);
    height: var(--spread-middle-height);
    opacity: var(--spread-middle-opacity, .96);
    filter: brightness(.87) saturate(.78);
    z-index: 2;
}

.spread-page-left {
    left: var(--spread-left-left);
    width: var(--spread-left-width);
    top: var(--spread-left-top);
    height: var(--spread-left-height);
    opacity: var(--spread-left-opacity, .9);
    filter: brightness(.78) saturate(.7);
    z-index: 1;
}

/* Hidden queue cards. They enter one position at a time instead of jumping
   into the composition from an unrelated location. */
.spread-page-prev {
    left: calc(-1 * var(--spread-main-width) - 24px);
    width: var(--spread-main-width);
    top: var(--spread-main-top);
    height: var(--spread-main-height);
    opacity: 0;
    filter: brightness(.95) saturate(.88);
    z-index: 4;
    pointer-events: none;
}

.spread-page-incoming {
    left: calc(-1 * var(--spread-left-width) - 24px);
    width: var(--spread-left-width);
    top: var(--spread-left-top);
    height: var(--spread-left-height);
    opacity: 0;
    filter: brightness(.78) saturate(.7);
    z-index: 0;
    pointer-events: none;
}

.spread-pages.is-dragging .spread-page {
    transition: none;
}

.spread-pages.is-dragging-next .spread-page-middle,
.spread-pages.is-committing-next .spread-page-middle {
    left: var(--spread-middle-left);
    width: var(--spread-middle-width);
    top: var(--spread-middle-top);
    height: var(--spread-middle-height);
    opacity: var(--spread-middle-opacity, .96);
    z-index: 2;
}

.spread-status {
    position: absolute;
    left: 50%;
    bottom: 4%;
    z-index: 10;
    display: flex;
    gap: 9px;
    align-items: center;
    color: #8b5f28;
    font: 10px 'DM Mono', monospace;
    letter-spacing: .14em;
    transform: translateX(-50%);
}

.spread-status i {
    color: #b7a58d;
    font-style: normal;
}

@media (max-width: 820px) {
    :root {
        --spread-main-left: calc(100% - var(--spread-main-width) - 14px);
        --spread-main-width: 84vw;
        --spread-middle-left: 10vw;
        --spread-middle-width: 43vw;
        --spread-left-left: 3vw;
        --spread-left-width: 24vw;
    }

    .scene-spread {
        height: calc(100svh - 68px);
        min-height: 530px;
        max-height: none;
    }

    .spread-page-left {
        height: calc(100% - 58px);
    }

    .spread-page-middle {
        height: calc(100% - 34px);
    }

    .spread-page-main {
        height: calc(100% - 18px);
    }

    .spread-status {
        bottom: 7%;
    }
}