/* =============================================
   PRODUCT EXPLAINER COMPONENT
   Reusable mattress visualizer for product pages.
   Three states:
     1. resting        — mattress image at rest
     2. is-hovering    — mattress lifts, CTA appears
     3. is-exploded    — image fades, layered stack appears
   Layer hover shows a tooltip with name + thickness + purpose.
   ============================================= */

.explainer {
    position: relative;
    width: 100%;
    max-width: 560px;
    aspect-ratio: 5 / 4;
    margin: 0 auto;
    --layer-radius: 12px;
}

.explainer-stage {
    position: absolute;
    inset: 0;
    perspective: 1400px;
    transform-style: preserve-3d;
}

/* ---------- Mattress (resting state) ---------- */
.explainer-mattress {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition:
        transform 0.7s cubic-bezier(0.16, 1, 0.3, 1),
        opacity 0.55s ease;
    will-change: transform;
}

.explainer-mattress img {
    width: 86%;
    max-width: 480px;
    filter: drop-shadow(0 30px 50px rgba(0, 0, 0, 0.45));
    pointer-events: none;
    transition: opacity 0.45s ease;
}

/* Soft drop-shadow ellipse beneath the mattress */
.explainer-shadow {
    position: absolute;
    bottom: 9%;
    left: 50%;
    transform: translateX(-50%) scale(0.78);
    width: 64%;
    height: 36px;
    background: radial-gradient(ellipse closest-side, rgba(0, 0, 0, 0.55), transparent 70%);
    filter: blur(6px);
    transition: transform 0.7s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.5s ease;
    pointer-events: none;
}

/* ---------- HOVER (resting → lifted) ----------
   NOTE: trigger the lift from the OUTER .explainer container — never
   the inner .explainer-mattress. The mattress moves on hover, so if
   :hover is bound to it the cursor leaves the lifted box on the
   bottom edge and we get a hover/un-hover loop (jitter). */
.explainer:not(.is-exploded):hover .explainer-mattress {
    transform: translateY(-22px) rotateX(2deg);
}

.explainer:not(.is-exploded):hover .explainer-shadow {
    transform: translateX(-50%) scale(1.06);
    opacity: 0.85;
}

/* CTA pill — appears on hover */
.explainer-cta {
    position: absolute;
    left: 50%;
    bottom: 6%;
    transform: translateX(-50%) translateY(16px);
    background: var(--accent-gold);
    color: #0a0e1a;
    border: none;
    border-radius: 100px;
    padding: 12px 28px;
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    font-size: 13px;
    letter-spacing: 0.6px;
    text-transform: uppercase;
    cursor: pointer;
    opacity: 0;
    pointer-events: none;
    transition:
        opacity 0.45s ease,
        transform 0.55s cubic-bezier(0.16, 1, 0.3, 1),
        box-shadow 0.3s ease;
    box-shadow: 0 16px 40px rgba(97, 181, 100, 0.25);
    z-index: 5;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.explainer-cta i {
    font-size: 12px;
}

.explainer:not(.is-exploded):hover .explainer-cta {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
}

.explainer-cta:hover {
    box-shadow: 0 20px 50px rgba(97, 181, 100, 0.45);
    background: var(--accent-gold);
}

/* ---------- LAYER STACK (exploded state) ---------- */
.explainer-stack {
    position: absolute;
    top: 8%;
    bottom: 12%;
    left: 8%;
    right: 8%;
    display: flex;
    flex-direction: column;
    border-radius: var(--layer-radius);
    overflow: hidden;
    opacity: 0;
    transform: translateY(12px) scale(0.96);
    transform-origin: center;
    transition:
        opacity 0.55s ease,
        transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
    pointer-events: none;
    box-shadow:
        0 30px 80px rgba(0, 0, 0, 0.5),
        0 0 0 1px rgba(255, 255, 255, 0.04);
}

.explainer.is-exploded .explainer-stack {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

/* When exploded, fade out the photo + shadow */
.explainer.is-exploded .explainer-mattress img {
    opacity: 0;
}

.explainer.is-exploded .explainer-shadow {
    opacity: 0;
}

.explainer.is-exploded .explainer-mattress {
    pointer-events: none;
}

.explainer.is-exploded .explainer-cta {
    opacity: 0;
    pointer-events: none;
}

/* ---------- INDIVIDUAL LAYER ---------- */
.explainer-layer {
    flex: 0 0 auto;
    /* height set inline as percentage from JS */
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 22px;
    cursor: pointer;
    color: rgba(0, 0, 0, 0.78);
    background: var(--layer-color, #c2a675);
    transition:
        filter 0.3s ease,
        transform 0.5s cubic-bezier(0.16, 1, 0.3, 1),
        box-shadow 0.3s ease;
    overflow: hidden;
    /* On enter: each layer slides in from left, staggered via JS */
    transform: translateX(-30px);
    opacity: 0;
}

.explainer.is-exploded .explainer-layer {
    transform: translateX(0);
    opacity: 1;
    transition-delay: var(--layer-delay, 0ms);
}

/* Subtle horizontal fibre lines to suggest material */
.explainer-layer::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        repeating-linear-gradient(
            90deg,
            rgba(255, 255, 255, 0.06) 0,
            rgba(255, 255, 255, 0.06) 1px,
            transparent 1px,
            transparent 6px
        );
    pointer-events: none;
    opacity: 0.6;
}

/* Layer labels */
.explainer-layer-name {
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    font-size: 12px;
    letter-spacing: 0.4px;
    text-transform: uppercase;
    color: rgba(0, 0, 0, 0.85);
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.18);
    z-index: 2;
    /* Keep label readable when layer is thin */
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 65%;
}

.explainer-layer-thickness {
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    font-size: 12px;
    letter-spacing: 0.5px;
    color: rgba(0, 0, 0, 0.65);
    background: rgba(255, 255, 255, 0.55);
    padding: 4px 10px;
    border-radius: 100px;
    z-index: 2;
    font-variant-numeric: tabular-nums;
}

/* Hover: brighten the layer + slight scale */
.explainer-layer:hover {
    filter: brightness(1.12) saturate(1.05);
}

.explainer-layer.is-active {
    filter: brightness(1.18) saturate(1.1);
    box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.35);
}

/* When hovering one layer, dim the others to focus attention */
.explainer-stack:hover .explainer-layer:not(:hover) {
    filter: brightness(0.78) saturate(0.85);
}

/* For very thin layers (< 8% of stack), hide thickness pill to avoid clutter */
.explainer-layer[data-thin="true"] .explainer-layer-thickness {
    display: none;
}

/* ---------- TOOLTIP ---------- */
.explainer-tooltip {
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
    background: rgba(10, 14, 26, 0.96);
    border: 1px solid rgba(97, 181, 100, 0.32);
    border-radius: 14px;
    padding: 18px 22px 20px;
    width: 280px;
    box-shadow:
        0 24px 60px rgba(0, 0, 0, 0.55),
        0 0 0 1px rgba(255, 255, 255, 0.04);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    opacity: 0;
    transform: translateX(8px);
    transition:
        opacity 0.25s ease,
        transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 20;
    font-family: 'Inter', sans-serif;
}

.explainer-tooltip.is-active {
    opacity: 1;
    transform: translateX(0);
}

.tooltip-eyebrow {
    display: block;
    color: var(--accent-gold);
    font-weight: 700;
    font-size: 10px;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 6px;
}

.tooltip-name {
    display: block;
    color: #fff;
    font-weight: 700;
    font-size: 16px;
    line-height: 1.25;
    margin-bottom: 8px;
}

.tooltip-thickness {
    display: inline-block;
    color: var(--accent-gold);
    font-weight: 700;
    font-size: 11px;
    letter-spacing: 1px;
    text-transform: uppercase;
    background: rgba(97, 181, 100, 0.1);
    border: 1px solid rgba(97, 181, 100, 0.25);
    padding: 4px 10px;
    border-radius: 100px;
    margin-bottom: 12px;
}

.tooltip-purpose {
    margin: 0;
    color: rgba(255, 255, 255, 0.72);
    font-size: 13px;
    line-height: 1.65;
    font-weight: 400;
}

/* ---------- BACK BUTTON ---------- */
.explainer-back {
    position: absolute;
    top: 12px;
    left: 12px;
    background: rgba(15, 20, 35, 0.85);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 100px;
    padding: 8px 16px;
    color: rgba(255, 255, 255, 0.85);
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    font-size: 11px;
    letter-spacing: 1px;
    text-transform: uppercase;
    cursor: pointer;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.45s ease, background 0.3s ease, color 0.3s ease;
    z-index: 8;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.explainer-back:hover {
    background: rgba(97, 181, 100, 0.12);
    color: var(--accent-gold);
    border-color: rgba(97, 181, 100, 0.5);
}

.explainer.is-exploded .explainer-back {
    opacity: 1;
    pointer-events: auto;
}

/* Cover label below the mattress (resting state) */
.explainer-cover-label {
    position: absolute;
    left: 50%;
    bottom: -6px;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.4);
    font-size: 11px;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    font-weight: 700;
    transition: opacity 0.4s ease;
    white-space: nowrap;
}

.explainer.is-exploded .explainer-cover-label {
    opacity: 0;
}

/* ---------- MOBILE ---------- */
@media (max-width: 720px) {
    .explainer {
        max-width: 100%;
        aspect-ratio: 4 / 3;
    }

    .explainer-tooltip {
        position: static;
        width: 100%;
        margin-top: 16px;
        opacity: 0;
        transform: translateY(-6px);
    }

    .explainer-tooltip.is-active {
        opacity: 1;
        transform: translateY(0);
    }

    .explainer-layer-name {
        font-size: 11px;
        max-width: 60%;
    }

    .explainer-layer-thickness {
        font-size: 11px;
        padding: 3px 8px;
    }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
    .explainer-mattress,
    .explainer-shadow,
    .explainer-stack,
    .explainer-layer,
    .explainer-cta,
    .explainer-tooltip,
    .explainer-back {
        transition: none !important;
        animation: none !important;
    }
}