/* ── Horizontal Timeline ─────────────────────────────────────── */
.bkbg-ht-app { font-family: inherit; }

.bkbg-ht-section {
    position: relative;
    overflow: hidden;
    user-select: none;
}

/* scrollable track */
.bkbg-ht-track-wrap {
    position: relative;
    overflow-x: auto;
    overflow-y: visible;
    scrollbar-width: none;
    -ms-overflow-style: none;
    cursor: grab;
}
.bkbg-ht-track-wrap::-webkit-scrollbar { display: none; }
.bkbg-ht-track-wrap.bkbg-ht-dragging  { cursor: grabbing; }

/* horizontal line */
.bkbg-ht-line {
    position: absolute;
    left: 0;
    right: 0;
    pointer-events: none;
    z-index: 0;
}

/* track flex container */
.bkbg-ht-track {
    display: flex;
    align-items: center;
    position: relative;
    z-index: 1;
}

/* per-item column */
.bkbg-ht-item-col {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    flex-shrink: 0;
}

/* alignment helpers */
.bkbg-ht-item-col.bkbg-ht-top { justify-content: flex-start; }
.bkbg-ht-item-col.bkbg-ht-bottom { justify-content: flex-end; }

/* connector rod between card and dot */
.bkbg-ht-connector {
    width: 2px;
    background: var(--ht-line-color, #6366f1);
    opacity: 0.35;
    flex-shrink: 0;
}

/* dot */
.bkbg-ht-dot {
    border-radius: 50%;
    flex-shrink: 0;
    position: relative;
    z-index: 3;
    transition: transform 0.25s, box-shadow 0.25s;
}
.bkbg-ht-item-col:hover .bkbg-ht-dot {
    transform: scale(1.3);
}

/* card */
.bkbg-ht-card {
    position: relative;
    z-index: 2;
    transition: transform 0.25s, box-shadow 0.25s;
    box-sizing: border-box;
}
.bkbg-ht-item-col:hover .bkbg-ht-card {
    transform: translateY(-3px);
}

.bkbg-ht-card-icon  { line-height: 1; margin-bottom: 8px; }
.bkbg-ht-card-icon svg { width: 1em; height: 1em; fill: currentColor; }
.bkbg-ht-card-icon .dashicons { font-size: inherit; width: 1em; height: 1em; line-height: 1; }
.bkbg-ht-card-icon .bkbg-icon-img { width: 1em; height: 1em; object-fit: contain; }

/* ── date typography (CSS-var driven) ───── */
.bkbg-ht-card-date {
    text-transform: var(--bkbg-ht-date-text-transform, uppercase);
    letter-spacing: var(--bkbg-ht-date-letter-spacing-d, 0.6px);
    margin-bottom: 4px;
    font-family: var(--bkbg-ht-date-font-family, inherit);
    font-size: var(--bkbg-ht-date-font-size-d, var(--bkbg-ht-date-sz, 11px));
    font-weight: var(--bkbg-ht-date-font-weight, 700);
    font-style: var(--bkbg-ht-date-font-style, normal);
    text-decoration: var(--bkbg-ht-date-text-decoration, none);
    line-height: var(--bkbg-ht-date-line-height-d, 1.4);
    word-spacing: var(--bkbg-ht-date-word-spacing-d, normal);
}

/* ── title typography (CSS-var driven) ───── */
.bkbg-ht-card-title {
    margin-bottom: 6px;
    font-family: var(--bkbg-ht-tt-font-family, inherit);
    font-size: var(--bkbg-ht-tt-font-size-d, var(--bkbg-ht-tt-sz, 13px));
    font-weight: var(--bkbg-ht-tt-font-weight, var(--bkbg-ht-tt-fw, 600));
    font-style: var(--bkbg-ht-tt-font-style, normal);
    text-decoration: var(--bkbg-ht-tt-text-decoration, none);
    text-transform: var(--bkbg-ht-tt-text-transform, none);
    line-height: var(--bkbg-ht-tt-line-height-d, var(--bkbg-ht-tt-lh, 1.35));
    letter-spacing: var(--bkbg-ht-tt-letter-spacing-d, normal);
    word-spacing: var(--bkbg-ht-tt-word-spacing-d, normal);
}

/* ── description typography (CSS-var driven) ───── */
.bkbg-ht-card-desc {
    font-family: var(--bkbg-ht-desc-font-family, inherit);
    font-size: var(--bkbg-ht-desc-font-size-d, var(--bkbg-ht-desc-sz, 11px));
    font-weight: var(--bkbg-ht-desc-font-weight, normal);
    font-style: var(--bkbg-ht-desc-font-style, normal);
    text-decoration: var(--bkbg-ht-desc-text-decoration, none);
    text-transform: var(--bkbg-ht-desc-text-transform, none);
    line-height: var(--bkbg-ht-desc-line-height-d, var(--bkbg-ht-desc-lh, 1.55));
    letter-spacing: var(--bkbg-ht-desc-letter-spacing-d, normal);
    word-spacing: var(--bkbg-ht-desc-word-spacing-d, normal);
}

/* ── Responsive: Tablet ───── */
@media (max-width: 1024px) {
    .bkbg-ht-card-date {
        font-size: var(--bkbg-ht-date-font-size-t, var(--bkbg-ht-date-font-size-d, var(--bkbg-ht-date-sz, 11px)));
        line-height: var(--bkbg-ht-date-line-height-t, var(--bkbg-ht-date-line-height-d, 1.4));
        letter-spacing: var(--bkbg-ht-date-letter-spacing-t, var(--bkbg-ht-date-letter-spacing-d, 0.6px));
        word-spacing: var(--bkbg-ht-date-word-spacing-t, var(--bkbg-ht-date-word-spacing-d, normal));
    }
    .bkbg-ht-card-title {
        font-size: var(--bkbg-ht-tt-font-size-t, var(--bkbg-ht-tt-font-size-d, var(--bkbg-ht-tt-sz, 13px)));
        line-height: var(--bkbg-ht-tt-line-height-t, var(--bkbg-ht-tt-line-height-d, var(--bkbg-ht-tt-lh, 1.35)));
        letter-spacing: var(--bkbg-ht-tt-letter-spacing-t, var(--bkbg-ht-tt-letter-spacing-d, normal));
        word-spacing: var(--bkbg-ht-tt-word-spacing-t, var(--bkbg-ht-tt-word-spacing-d, normal));
    }
    .bkbg-ht-card-desc {
        font-size: var(--bkbg-ht-desc-font-size-t, var(--bkbg-ht-desc-font-size-d, var(--bkbg-ht-desc-sz, 11px)));
        line-height: var(--bkbg-ht-desc-line-height-t, var(--bkbg-ht-desc-line-height-d, var(--bkbg-ht-desc-lh, 1.55)));
        letter-spacing: var(--bkbg-ht-desc-letter-spacing-t, var(--bkbg-ht-desc-letter-spacing-d, normal));
        word-spacing: var(--bkbg-ht-desc-word-spacing-t, var(--bkbg-ht-desc-word-spacing-d, normal));
    }
}

/* ── Responsive: Mobile ───── */
@media (max-width: 767px) {
    .bkbg-ht-card-date {
        font-size: var(--bkbg-ht-date-font-size-m, var(--bkbg-ht-date-font-size-t, var(--bkbg-ht-date-font-size-d, var(--bkbg-ht-date-sz, 11px))));
        line-height: var(--bkbg-ht-date-line-height-m, var(--bkbg-ht-date-line-height-t, var(--bkbg-ht-date-line-height-d, 1.4)));
        letter-spacing: var(--bkbg-ht-date-letter-spacing-m, var(--bkbg-ht-date-letter-spacing-t, var(--bkbg-ht-date-letter-spacing-d, 0.6px)));
        word-spacing: var(--bkbg-ht-date-word-spacing-m, var(--bkbg-ht-date-word-spacing-t, var(--bkbg-ht-date-word-spacing-d, normal)));
    }
    .bkbg-ht-card-title {
        font-size: var(--bkbg-ht-tt-font-size-m, var(--bkbg-ht-tt-font-size-t, var(--bkbg-ht-tt-font-size-d, var(--bkbg-ht-tt-sz, 13px))));
        line-height: var(--bkbg-ht-tt-line-height-m, var(--bkbg-ht-tt-line-height-t, var(--bkbg-ht-tt-line-height-d, var(--bkbg-ht-tt-lh, 1.35))));
        letter-spacing: var(--bkbg-ht-tt-letter-spacing-m, var(--bkbg-ht-tt-letter-spacing-t, var(--bkbg-ht-tt-letter-spacing-d, normal)));
        word-spacing: var(--bkbg-ht-tt-word-spacing-m, var(--bkbg-ht-tt-word-spacing-t, var(--bkbg-ht-tt-word-spacing-d, normal)));
    }
    .bkbg-ht-card-desc {
        font-size: var(--bkbg-ht-desc-font-size-m, var(--bkbg-ht-desc-font-size-t, var(--bkbg-ht-desc-font-size-d, var(--bkbg-ht-desc-sz, 11px))));
        line-height: var(--bkbg-ht-desc-line-height-m, var(--bkbg-ht-desc-line-height-t, var(--bkbg-ht-desc-line-height-d, var(--bkbg-ht-desc-lh, 1.55))));
        letter-spacing: var(--bkbg-ht-desc-letter-spacing-m, var(--bkbg-ht-desc-letter-spacing-t, var(--bkbg-ht-desc-letter-spacing-d, normal)));
        word-spacing: var(--bkbg-ht-desc-word-spacing-m, var(--bkbg-ht-desc-word-spacing-t, var(--bkbg-ht-desc-word-spacing-d, normal)));
    }
}

.bkbg-ht-card-img {
    width: 100%;
    border-radius: 8px;
    object-fit: cover;
    margin-bottom: 10px;
    display: block;
}

/* navigation arrows */
.bkbg-ht-arrows {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 16px;
}
.bkbg-ht-arrow {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.2s, transform 0.15s;
}
.bkbg-ht-arrow:hover { transform: scale(1.1); }
.bkbg-ht-arrow:disabled { opacity: 0.3; cursor: default; }

/* scroll-reveal animation */
.bkbg-ht-hidden {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}
.bkbg-ht-visible {
    opacity: 1;
    transform: translateY(0);
}
.bkbg-ht-item-col.bkbg-ht-bottom .bkbg-ht-hidden {
    transform: translateY(-24px);
}

/* fade edges */
.bkbg-ht-section::before,
.bkbg-ht-section::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    width: 48px;
    z-index: 10;
    pointer-events: none;
}
.bkbg-ht-section::before { left: 0;  background: linear-gradient(to right, var(--ht-section-bg, #f8fafc), transparent); }
.bkbg-ht-section::after  { right: 0; background: linear-gradient(to left,  var(--ht-section-bg, #f8fafc), transparent); }