/* === Scrollytelling Block === */

.bkbg-sty-app { display: none; }

/* Editor utility */
.bkbg-sty-editor-preview { width: 100%; }
.bkbg-sty-editor-chapter { border: 1px solid #e5e7eb; }

/* ---- Frontend layout ---- */
.bkbg-sty-section {
    position: relative;
    width: 100%;
}

/* Sticky background container */
.bkbg-sty-sticky {
    position: sticky;
    top: 0;
    width: 100%;
    overflow: hidden;
    pointer-events: none;
    z-index: 0;
}

.bkbg-sty-bg-layer {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    transition: opacity 0.6s ease;
}

.bkbg-sty-bg-layer.sty-fade-out {
    opacity: 0;
}

.bkbg-sty-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0);
    transition: background 0.6s ease;
    pointer-events: none;
}

/* Text panels container */
.bkbg-sty-panels {
    position: relative;
    z-index: 2;
}

/* Individual text panel */
.bkbg-sty-panel {
    display: flex;
    align-items: center;
    width: 100%;
    box-sizing: border-box;
}

.bkbg-sty-panel.sty-pos-left  { justify-content: flex-start; }
.bkbg-sty-panel.sty-pos-right { justify-content: flex-end; }
.bkbg-sty-panel.sty-pos-center { justify-content: center; }

/* Text panel inner box */
.bkbg-sty-panel-inner {
    padding: 48px 40px;
    border-radius: 12px;
    max-width: 100%;
    box-sizing: border-box;
}

.bkbg-sty-eyebrow {
    display: inline-block;
    font-family: var(--bksty-et-font-family, inherit);
    font-size: var(--bksty-et-font-size-d, 12px);
    font-weight: var(--bksty-et-font-weight, 700);
    font-style: var(--bksty-et-font-style, normal);
    text-decoration: var(--bksty-et-text-decoration, none);
    text-transform: var(--bksty-et-text-transform, uppercase);
    line-height: var(--bksty-et-line-height-d, normal);
    letter-spacing: var(--bksty-et-letter-spacing-d, 0.12em);
    word-spacing: var(--bksty-et-word-spacing-d, normal);
    margin-bottom: 12px;
}

.bkbg-sty-panel-inner .bkbg-sty-title {
    font-family: var(--bksty-tt-font-family);
    font-size: var(--bksty-tt-font-size-d, clamp(22px, 3vw, 36px));
    font-weight: var(--bksty-tt-font-weight, 800);
    font-style: var(--bksty-tt-font-style, normal);
    text-decoration: var(--bksty-tt-text-decoration, none);
    text-transform: var(--bksty-tt-text-transform, none);
    line-height: var(--bksty-tt-line-height-d, 1.2);
    letter-spacing: var(--bksty-tt-letter-spacing-d, normal);
    word-spacing: var(--bksty-tt-word-spacing-d, normal);
    margin: 0 0 16px;
}

.bkbg-sty-text {
    font-family: var(--bksty-bt-font-family, inherit);
    font-size: var(--bksty-bt-font-size-d, 16px);
    font-weight: var(--bksty-bt-font-weight, inherit);
    font-style: var(--bksty-bt-font-style, normal);
    text-decoration: var(--bksty-bt-text-decoration, none);
    text-transform: var(--bksty-bt-text-transform, none);
    line-height: var(--bksty-bt-line-height-d, 1.7);
    letter-spacing: var(--bksty-bt-letter-spacing-d, normal);
    word-spacing: var(--bksty-bt-word-spacing-d, normal);
    margin: 0;
}

/* Progress indicator */
.bkbg-sty-progress {
    position: fixed;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 8px;
    z-index: 100;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.4s;
}

.bkbg-sty-progress.visible {
    opacity: 1;
    pointer-events: auto;
}

.bkbg-sty-progress-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    cursor: pointer;
    transition: background 0.3s, transform 0.3s;
    pointer-events: auto;
}

.bkbg-sty-progress-dot.active {
    transform: scale(1.4);
}

/* Slide transition variant */
.bkbg-sty-bg-layer.sty-slide-out {
    transform: translateX(-100%);
    opacity: 0;
}

/* Responsive typography */
@media (max-width: 1024px) {
    .bkbg-sty-eyebrow {
        font-size: var(--bksty-et-font-size-t, var(--bksty-et-font-size-d, 12px));
        line-height: var(--bksty-et-line-height-t, var(--bksty-et-line-height-d, normal));
        letter-spacing: var(--bksty-et-letter-spacing-t, var(--bksty-et-letter-spacing-d, 0.12em));
        word-spacing: var(--bksty-et-word-spacing-t, var(--bksty-et-word-spacing-d, normal));
    }
    .bkbg-sty-panel-inner .bkbg-sty-title {
        font-size: var(--bksty-tt-font-size-t, var(--bksty-tt-font-size-d, clamp(22px, 3vw, 36px)));
        line-height: var(--bksty-tt-line-height-t, var(--bksty-tt-line-height-d, 1.2));
        letter-spacing: var(--bksty-tt-letter-spacing-t, var(--bksty-tt-letter-spacing-d, normal));
        word-spacing: var(--bksty-tt-word-spacing-t, var(--bksty-tt-word-spacing-d, normal));
    }
    .bkbg-sty-text {
        font-size: var(--bksty-bt-font-size-t, var(--bksty-bt-font-size-d, 16px));
        line-height: var(--bksty-bt-line-height-t, var(--bksty-bt-line-height-d, 1.7));
        letter-spacing: var(--bksty-bt-letter-spacing-t, var(--bksty-bt-letter-spacing-d, normal));
        word-spacing: var(--bksty-bt-word-spacing-t, var(--bksty-bt-word-spacing-d, normal));
    }
}
@media (max-width: 767px) {
    .bkbg-sty-eyebrow {
        font-size: var(--bksty-et-font-size-m, var(--bksty-et-font-size-t, var(--bksty-et-font-size-d, 12px)));
        line-height: var(--bksty-et-line-height-m, var(--bksty-et-line-height-t, var(--bksty-et-line-height-d, normal)));
        letter-spacing: var(--bksty-et-letter-spacing-m, var(--bksty-et-letter-spacing-t, var(--bksty-et-letter-spacing-d, 0.12em)));
        word-spacing: var(--bksty-et-word-spacing-m, var(--bksty-et-word-spacing-t, var(--bksty-et-word-spacing-d, normal)));
    }
    .bkbg-sty-panel-inner .bkbg-sty-title {
        font-size: var(--bksty-tt-font-size-m, var(--bksty-tt-font-size-t, var(--bksty-tt-font-size-d, clamp(22px, 3vw, 36px))));
        line-height: var(--bksty-tt-line-height-m, var(--bksty-tt-line-height-t, var(--bksty-tt-line-height-d, 1.2)));
        letter-spacing: var(--bksty-tt-letter-spacing-m, var(--bksty-tt-letter-spacing-t, var(--bksty-tt-letter-spacing-d, normal)));
        word-spacing: var(--bksty-tt-word-spacing-m, var(--bksty-tt-word-spacing-t, var(--bksty-tt-word-spacing-d, normal)));
    }
    .bkbg-sty-text {
        font-size: var(--bksty-bt-font-size-m, var(--bksty-bt-font-size-t, var(--bksty-bt-font-size-d, 16px)));
        line-height: var(--bksty-bt-line-height-m, var(--bksty-bt-line-height-t, var(--bksty-bt-line-height-d, 1.7)));
        letter-spacing: var(--bksty-bt-letter-spacing-m, var(--bksty-bt-letter-spacing-t, var(--bksty-bt-letter-spacing-d, normal)));
        word-spacing: var(--bksty-bt-word-spacing-m, var(--bksty-bt-word-spacing-t, var(--bksty-bt-word-spacing-d, normal)));
    }
}

/* Responsive */
@media (max-width: 768px) {
    .bkbg-sty-panel-inner {
        padding: 32px 20px;
    }
    .bkbg-sty-progress {
        right: 12px;
    }
}