/* SLU Card Stack */

/* ── Wrapper ──────────────────────────────────────────────────────────── */
.slu-bs-wrap {
    --bs-active-flex:      4;
    --bs-inactive-flex:    1;
    --bs-min-size:         60px;
    --bs-height:           500px;
    --bs-duration:         0.8s;
    --bs-easing:           cubic-bezier(0.4, 0, 0.2, 1);
    --bs-overlay-active:   rgba(0,0,0,0.15);
    --bs-overlay-inactive: rgba(0,0,0,0.55);
    --bs-content-color:    #ffffff;
    --bs-radius:           0px;

    display: flex;
    width: 100%;
    height: var(--bs-height);
    border-radius: var(--bs-radius);
    overflow: hidden;
    gap: 0;
}

.slu-bs-wrap.is-vertical {
    flex-direction: column;
}

/* ── Individual panel ─────────────────────────────────────────────────── */
.slu-bs-panel {
    position: relative;
    flex: var(--bs-inactive-flex);
    min-width: var(--bs-min-size);
    min-height: var(--bs-min-size);
    overflow: hidden;
    cursor: pointer;
    transition: flex var(--bs-duration) var(--bs-easing);
}

.slu-bs-panel.is-active {
    flex: var(--bs-active-flex);
    cursor: default;
}

/* ── Background image ─────────────────────────────────────────────────── */
/* Start at scale(1) — inactive panels scale UP to 1.05, active scales back to 1.
   This ensures the transition fires on ALL panels including the second one,
   because the state change is always from 1 → 1.05 or 1.05 → 1. */
.slu-bs-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    transform: scale(1);
    transition:
        transform var(--bs-duration) var(--bs-easing);
}

.slu-bs-panel:not(.is-active) .slu-bs-bg {
    transform: scale(1.05);
}

/* ── Overlay ──────────────────────────────────────────────────────────── */
.slu-bs-overlay {
    position: absolute;
    inset: 0;
    background: var(--bs-overlay-inactive);
    transition: background var(--bs-duration) var(--bs-easing);
}

.slu-bs-panel.is-active .slu-bs-overlay {
    background: var(--bs-overlay-active);
}

/* ── Content ──────────────────────────────────────────────────────────── */
.slu-bs-content {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 28px 24px;
    color: var(--bs-content-color);
    z-index: 2;
}

/* ── Title ────────────────────────────────────────────────────────────── */
.slu-bs-title {
    font-weight: 700;
    line-height: 1.2;
    margin: 0 0 10px;
    color: var(--bs-content-color);
    transition: opacity var(--bs-duration) var(--bs-easing),
                transform var(--bs-duration) var(--bs-easing);
}

/* Inactive horizontal — title pinned to bottom */
.slu-bs-wrap:not(.is-vertical) .slu-bs-panel:not(.is-active) .slu-bs-content {
    justify-content: flex-end;
    align-items: flex-start;
}

/* Vertical inactive — title centred */
.slu-bs-wrap.is-vertical .slu-bs-panel:not(.is-active) .slu-bs-content {
    justify-content: center;
}

/* ── Description ──────────────────────────────────────────────────────── */
.slu-bs-desc {
    line-height: 1.6;
    margin: 0 0 16px;
    color: var(--bs-content-color);
    opacity: 0;
    transform: translateY(12px);
    max-width: 480px;
    max-height: 0;
    overflow: hidden;
    margin: 0;
    transition: opacity var(--bs-duration) var(--bs-easing),
                transform var(--bs-duration) var(--bs-easing),
                max-height var(--bs-duration) var(--bs-easing),
                margin var(--bs-duration) var(--bs-easing);
    transition-delay: calc(var(--bs-duration) * 0.4);
}

.slu-bs-btn-wrap {
    opacity: 0;
    transform: translateY(12px);
    max-height: 0;
    overflow: hidden;
    transition: opacity var(--bs-duration) var(--bs-easing),
                transform var(--bs-duration) var(--bs-easing),
                max-height var(--bs-duration) var(--bs-easing);
    transition-delay: calc(var(--bs-duration) * 0.5);
}

/* Active panel — reveal desc and button */
.slu-bs-panel.is-active .slu-bs-desc {
    opacity: 1;
    transform: translateY(0);
    max-height: 200px;
    margin: 0 0 16px;
}

.slu-bs-panel.is-active .slu-bs-btn-wrap {
    opacity: 1;
    transform: translateY(0);
    max-height: 100px;
}

/* ── Button styles ────────────────────────────────────────────────────── */
.slu-bs-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 22px;
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background .2s ease, color .2s ease;
    white-space: nowrap;
    border: 2px solid transparent;
    background: var(--bs-btn-bg, #ffffff);
    color: var(--bs-btn-color, #111827);
    border-color: var(--bs-btn-border, transparent);
}

.slu-bs-btn:hover {
    background: var(--bs-btn-bg-hover, rgba(255,255,255,0.85));
    color: var(--bs-btn-color-hover, #111827);
    text-decoration: none;
}

/* ── Responsive ───────────────────────────────────────────────────────── */
@media (max-width: 768px) {
    .slu-bs-wrap {
        flex-direction: column !important;
        height: auto !important;
    }
    .slu-bs-panel {
        min-height: 80px;
        min-width: unset;
    }
    .slu-bs-panel.is-active {
        min-height: 360px;
    }
    .slu-bs-desc,
    .slu-bs-btn-wrap {
        opacity: 1 !important;
        transform: none !important;
    }
}