/* ============================================================
   Post Navigation — style.css
   Prefix: bkbg-pn-
   ============================================================ */

.bkbg-pn-wrap {
    box-sizing: border-box;
    width: 100%;
    background: var(--bkbg-pn-bg, #ffffff);
    padding: var(--bkbg-pn-pt, 48px) 24px var(--bkbg-pn-pb, 48px);
}

.bkbg-pn-inner {
    max-width: var(--bkbg-pn-max-w, 860px);
    margin: 0 auto;
    display: flex;
    align-items: stretch;
    gap: var(--bkbg-pn-gap, 16px);
}

/* ---- Card base ---- */
.bkbg-pn-card {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 20px 24px;
    border-radius: var(--bkbg-pn-radius, 14px);
    text-decoration: none;
    color: var(--bkbg-pn-text, #0f172a);
    background: var(--bkbg-pn-card-bg, #f8fafc);
    border: 1px solid var(--bkbg-pn-border, #e2e8f0);
    transition: background .15s, border-color .15s, transform .15s, box-shadow .15s;
    min-width: 0;
}
.bkbg-pn-card:hover {
    background: var(--bkbg-pn-hover-bg, #f1f5f9);
    border-color: var(--bkbg-pn-accent, #6c3fb5);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(0,0,0,.06);
    color: var(--bkbg-pn-text, #0f172a);
}

.bkbg-pn-card--next { justify-content: flex-end; }

.bkbg-pn-body {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
}
.bkbg-pn-body--next { text-align: right; }

.bkbg-pn-label {
    color: var(--bkbg-pn-accent, #6c3fb5);
    white-space: nowrap;
    font-family: var(--bkbg-pn-lb-font-family, inherit);
    font-size: var(--bkbg-pn-lb-font-size-d, 11px);
    font-weight: var(--bkbg-pn-lb-font-weight, 600);
    font-style: var(--bkbg-pn-lb-font-style, normal);
    text-decoration: var(--bkbg-pn-lb-text-decoration, none);
    text-transform: var(--bkbg-pn-lb-text-transform, uppercase);
    line-height: var(--bkbg-pn-lb-line-height-d, 1.4);
    letter-spacing: var(--bkbg-pn-lb-letter-spacing-d, 0.06em);
    word-spacing: var(--bkbg-pn-lb-word-spacing-d, normal);
}

.bkbg-pn-title {
    color: var(--bkbg-pn-text, #0f172a);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: block;
    font-family: var(--bkbg-pn-tt-font-family, inherit);
    font-size: var(--bkbg-pn-tt-font-size-d, 17px);
    font-weight: var(--bkbg-pn-tt-font-weight, 600);
    font-style: var(--bkbg-pn-tt-font-style, normal);
    text-decoration: var(--bkbg-pn-tt-text-decoration, none);
    text-transform: var(--bkbg-pn-tt-text-transform, none);
    line-height: var(--bkbg-pn-tt-line-height-d, 1.35);
    letter-spacing: var(--bkbg-pn-tt-letter-spacing-d, normal);
    word-spacing: var(--bkbg-pn-tt-word-spacing-d, normal);
}

.bkbg-pn-arrow {
    font-size: var(--bkbg-pn-arrow-sz, 22px);
    width: var(--bkbg-pn-arrow-sz, 22px);
    height: var(--bkbg-pn-arrow-sz, 22px);
    color: var(--bkbg-pn-accent, #6c3fb5);
    flex-shrink: 0;
    transition: transform .15s;
}
.bkbg-pn-card--prev:hover .bkbg-pn-arrow { transform: translateX(-3px); }
.bkbg-pn-card--next:hover .bkbg-pn-arrow { transform: translateX(3px); }

.bkbg-pn-divider {
    width: 1px;
    background: var(--bkbg-pn-border, #e2e8f0);
    flex-shrink: 0;
    align-self: stretch;
    margin: 4px 0;
}

/* ============================================================
   Style Variants
   ============================================================ */

/* minimal */
.bkbg-pn-style--minimal .bkbg-pn-card {
    background: transparent;
    border-color: transparent;
    border-radius: 0;
    padding-left: 0;
    padding-right: 0;
    border-top: 1px solid var(--bkbg-pn-border, #e2e8f0);
}
.bkbg-pn-style--minimal .bkbg-pn-card:hover { background: transparent; transform: none; box-shadow: none; }

/* arrows — larger arrows, minimal background */
.bkbg-pn-style--arrows .bkbg-pn-card { background: transparent; border-color: transparent; }
.bkbg-pn-style--arrows .bkbg-pn-arrow { font-size: calc(var(--bkbg-pn-arrow-sz, 22px) * 1.4); }
.bkbg-pn-style--arrows .bkbg-pn-card:hover { background: var(--bkbg-pn-card-bg, #f8fafc); }

/* pills */
.bkbg-pn-style--pills .bkbg-pn-card {
    border-radius: 999px;
    padding: 14px 24px;
}

/* split — full width, flush border */
.bkbg-pn-style--split .bkbg-pn-inner {
    gap: 0;
    border: 1px solid var(--bkbg-pn-border, #e2e8f0);
    border-radius: var(--bkbg-pn-radius, 14px);
    overflow: hidden;
}
.bkbg-pn-style--split .bkbg-pn-card { border-radius: 0; border: none; border-right: 1px solid var(--bkbg-pn-border, #e2e8f0); }
.bkbg-pn-style--split .bkbg-pn-card--next { border-right: none; }
.bkbg-pn-style--split .bkbg-pn-divider { display: none; }

/* ── Typography Responsive ── */
@media (max-width: 1024px) {
    .bkbg-pn-label {
        font-size: var(--bkbg-pn-lb-font-size-t, 11px);
        line-height: var(--bkbg-pn-lb-line-height-t, 1.4);
        letter-spacing: var(--bkbg-pn-lb-letter-spacing-t, 0.06em);
        word-spacing: var(--bkbg-pn-lb-word-spacing-t, normal);
    }
    .bkbg-pn-title {
        font-size: var(--bkbg-pn-tt-font-size-t, 17px);
        line-height: var(--bkbg-pn-tt-line-height-t, 1.35);
        letter-spacing: var(--bkbg-pn-tt-letter-spacing-t, normal);
        word-spacing: var(--bkbg-pn-tt-word-spacing-t, normal);
    }
}

@media (max-width: 767px) {
    .bkbg-pn-label {
        font-size: var(--bkbg-pn-lb-font-size-m, 11px);
        line-height: var(--bkbg-pn-lb-line-height-m, 1.4);
        letter-spacing: var(--bkbg-pn-lb-letter-spacing-m, 0.06em);
        word-spacing: var(--bkbg-pn-lb-word-spacing-m, normal);
    }
    .bkbg-pn-title {
        font-size: var(--bkbg-pn-tt-font-size-m, 17px);
        line-height: var(--bkbg-pn-tt-line-height-m, 1.35);
        letter-spacing: var(--bkbg-pn-tt-letter-spacing-m, normal);
        word-spacing: var(--bkbg-pn-tt-word-spacing-m, normal);
    }
}

/* Responsive */
@media (max-width: 560px) {
    .bkbg-pn-inner { flex-direction: column; }
    .bkbg-pn-divider { width: auto; height: 1px; }
    .bkbg-pn-card--next { justify-content: flex-start; }
    .bkbg-pn-body--next { text-align: left; }
    .bkbg-pn-style--split .bkbg-pn-card { border-right: none; border-bottom: 1px solid var(--bkbg-pn-border, #e2e8f0); }
    .bkbg-pn-style--split .bkbg-pn-card--next { border-bottom: none; }
}