.part-hero {
    padding: 32px 42px 42px;

    border-radius: 24px;
    background: rgba(255,255,255,.94);
}

.part-breadcrumb {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;

    margin-bottom: 24px;

    font-size: 13px;
    color: #777;
}

.part-breadcrumb a {
    color: inherit;
    text-decoration: none;
}

.part-breadcrumb a:hover {
    color: #111;
    text-decoration: underline;
}


.part-series-navigation {
    display: grid;
    grid-template-columns: minmax(0,1fr) auto minmax(0,1fr);
    gap: 24px;
    align-items: start;

    margin-bottom: 28px;
    padding-bottom: 22px;

    border-bottom: 1px solid rgba(0,0,0,.08);
}

.part-series-navigation-prev {
    text-align: left;
}

.part-series-navigation-current {
    padding-top: 3px;

    color: #777;
    font-size: 13px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: .1em;
    white-space: nowrap;
}

.part-series-navigation-next {
    text-align: right;
}

.part-series-navigation a {
    display: inline-grid;
    gap: 3px;

    max-width: 280px;

    color: #444;
    text-decoration: none;
}

.part-series-navigation a span {
    color: #888;
    font-size: 12px;
    font-weight: 700;
}

.part-series-navigation a strong {
    font-size: 14px;
    line-height: 1.3;
}

.part-series-navigation a:hover strong {
    text-decoration: underline;
}


.part-hero-main {
    display: grid;
    grid-template-columns: minmax(220px, 320px) minmax(0, 1fr);
    gap: 46px;
}

.part-hero-cover img {
    display: block;
    width: 100%;
    height: auto;

    border-radius: 12px;
    box-shadow: 0 14px 32px rgba(0,0,0,.18);
}

.part-hero-content {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.part-hero-top h1 {
    margin: 0;

    font-size: clamp(38px, 5vw, 64px);
    line-height: 1.02;
}

.part-hero-byline {
    margin-top: 14px;
    margin-left: 22px;

    color: #666;
    font-size: 16px;
    font-weight: 700;
}

.part-hero-byline a {
    color: inherit;
    text-decoration: none;
}

.part-hero-byline a:hover {
    text-decoration: underline;
}

.part-hero-tagline {
    max-width: 760px;

    margin-top: 44px;

    font-size: 21px;
    line-height: 1.45;
    font-weight: 700;
    color: #333;
}

.part-hero-bottom {
    margin-top: auto;
    padding-top: 38px;
}

.part-hero-purchase-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.part-hero-purchase-actions .kp-btn {
    gap: 10px;
}

.part-hero-action-price {
    padding-left: 10px;
    border-left: 1px solid currentColor;
    opacity: .75;
}

.part-hero-status {
    display: inline-flex;

    padding: 9px 14px;

    border-radius: 999px;
    background: rgba(0,0,0,.07);

    font-size: 14px;
    font-weight: 800;
}


@media (max-width: 800px) {

    .part-hero {
        padding: 24px;
    }

    .part-series-navigation {
        grid-template-columns: 1fr 1fr;
    }

    .part-series-navigation-current {
        grid-column: 1 / -1;
        grid-row: 1;

        text-align: center;
    }

    .part-series-navigation-prev {
        grid-column: 1;
    }

    .part-series-navigation-next {
        grid-column: 2;
    }

    .part-hero-main {
        grid-template-columns: 1fr;
    }

    .part-hero-cover {
        max-width: 300px;
        margin: 0 auto;
    }

    .part-hero-byline {
        margin-left: 0;
    }
}

.part-section {
    margin-top: 28px;
    padding: 42px;

    border-radius: 24px;
    background: rgba(255,255,255,.94);
}

.part-section h2 {
    margin: 0 0 28px;
}

.part-about-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.5fr) minmax(260px, .7fr);
    gap: 48px;
}

.part-about-text {
    min-width: 0;
}

.part-annotation {
    max-width: 760px;

    font-size: 17px;
    line-height: 1.75;
    color: #333;
}

.part-about-facts {
    padding-left: 34px;

    border-left: 1px solid rgba(0,0,0,.1);
}

.part-about-facts-label {
    margin-bottom: 20px;

    font-size: 12px;
    font-weight: 800;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: #777;
}

.part-about-fact {
    display: grid;
    gap: 3px;

    padding: 14px 0;

    border-bottom: 1px solid rgba(0,0,0,.06);
}

.part-about-fact:last-child {
    border-bottom: 0;
}

.part-about-fact strong {
    font-size: 20px;
    line-height: 1.2;
}

.part-about-fact span {
    font-size: 13px;
    color: #777;
}

@media (max-width: 800px) {

    .part-section {
        padding: 28px 24px;
    }

    .part-about-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .part-about-facts {
        padding-left: 0;
        padding-top: 24px;

        border-left: 0;
        border-top: 1px solid rgba(0,0,0,.1);
    }
}

.part-section-heading {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    align-items: flex-start;

    margin-bottom: 28px;
}

.part-section-heading h2 {
    margin: 0;
}

.part-section-subtitle {
    margin-top: 7px;

    font-size: 13px;
    color: #777;
}


.part-chapter-list {
    border-top: 1px solid rgba(0,0,0,.08);
}

.part-chapter-row {
    display: grid;
    grid-template-columns: 56px minmax(0,1fr) auto 100px;
    gap: 16px;
    align-items: center;

    min-height: 62px;

    border-bottom: 1px solid rgba(0,0,0,.07);
}

.part-chapter-row:hover {
    background: rgba(0,0,0,.018);
}

.part-chapter-number {
    padding-left: 8px;

    font-size: 13px;
    font-weight: 800;
    color: #999;
}

.part-chapter-title {
    min-width: 0;

    font-size: 16px;
    font-weight: 650;
    line-height: 1.35;
}

.part-chapter-status {
    text-align: right;
}

.part-chapter-badge {
    display: inline-flex;
    align-items: center;

    padding: 5px 9px;

    border-radius: 999px;

    background: rgba(0,0,0,.06);

    font-size: 11px;
    font-weight: 800;
    line-height: 1;
    text-transform: uppercase;
    letter-spacing: .05em;

    color: #777;
}

.part-chapter-badge-demo {
    background: rgba(0,0,0,.09);
    color: #333;
}

.part-chapter-badge-owned {
    background: rgba(0,0,0,.04);
    color: #666;
}

.part-chapter-action {
    text-align: right;
}

.part-chapter-read-link {
    font-size: 13px;
    font-weight: 800;

    color: #111;
    text-decoration: none;

    white-space: nowrap;
}

.part-chapter-read-link:hover {
    text-decoration: underline;
}

.part-chapter-row-preparing {
    opacity: .55;
}


@media (max-width: 700px) {

    .part-chapter-row {
        grid-template-columns: 42px minmax(0,1fr) auto;
        gap: 10px;

        padding: 12px 0;
    }

    .part-chapter-action {
        grid-column: 2 / -1;
        text-align: left;
    }

    .part-chapter-status {
        text-align: right;
    }
}

.part-quotes-section h2 {
    margin-bottom: 26px;
}

.part-quotes-list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.part-quote {
    display: inline-block;
    width: 100%;

    margin: 0 0 18px;
    padding: 14px 18px;

    break-inside: avoid;

    border-radius: 16px;
    background: rgba(0,0,0,.09);
}

.part-quote-text {
    margin: 0;

    white-space: pre-line;

    font-size: 16px;
    line-height: 1.5;
    font-weight: 400;

    color: #333;
}

@media (max-width: 950px) {

    .part-quotes-list {
        column-count: 2;
    }

}

@media (max-width: 650px) {

    .part-quotes-list {
        column-count: 1;
    }

}
.part-languages { display:flex; flex-wrap:wrap; gap:.45rem; margin-top:.75rem; }
.part-language { display:inline-flex; align-items:center; gap:.35rem; padding:.35rem .55rem; border:1px solid rgba(127,127,127,.22); border-radius:999px; font-size:.86rem; }
.part-language strong { font-size:.78rem; opacity:.7; }

.part-language-complete strong { color:#168347; opacity:1; font-size:1rem; font-weight:800; }

/* Etapa 42: prepared bilingual variants, intentionally not purchasable. */
.part-dual-preparing { display:flex; flex-wrap:wrap; align-items:center; gap:.45rem; margin-top:.55rem; font-size:.83rem; }
.part-dual-heading { opacity:.75; margin-right:.15rem; }
.part-dual-chip { display:inline-flex; align-items:center; gap:.45rem; border:1px dashed rgba(127,127,127,.38); border-radius:999px; padding:.32rem .55rem; background:rgba(127,127,127,.045); }
.part-dual-pair { font-weight:650; }
.part-dual-state { opacity:.68; font-size:.78rem; }

/* Etapa 43: quiet cover ribbons and adjacent language + Dual group */
.book-main-cover, .part-hero-cover { position: relative; }
.kp-cover-ribbons { position:absolute; z-index:2; top:12px; left:12px; right:12px; display:flex; flex-wrap:wrap; gap:6px; pointer-events:none; }
.kp-cover-ribbon { display:inline-flex; align-items:center; background:rgba(18,25,34,.87); color:#fff; border:1px solid rgba(255,255,255,.34); border-radius:999px; padding:5px 10px; font-size:12px; font-weight:700; line-height:1.2; backdrop-filter:blur(4px); box-shadow:0 2px 7px rgba(0,0,0,.12); }
.kp-cover-ribbon-sale { background:rgba(128,48,29,.94); }
.kp-cover-ribbon-dual { background:rgba(33,70,101,.93); }
.book-availability .book-languages { margin-top:.35rem; }
.book-dual-preparing, .part-dual-preparing { margin-top:.55rem; }
.book-hero-bottom, .part-hero-bottom { padding-top:24px; }

/* Etapa 44: translated language groups. */
.part-language-section-label { font-size:.72rem; font-weight:700; letter-spacing:.09em; text-transform:uppercase; opacity:.62; margin-top:.65rem; }
.part-language-section-label + .part-languages { margin-top:.35rem; }
.part-dual-preparing { display:block; margin-top:.8rem; }
.part-dual-heading { display:inline-block; margin-bottom:.35rem; font-size:.72rem; font-weight:700; letter-spacing:.06em; text-transform:uppercase; opacity:.75; color:inherit; text-decoration:none; border-bottom:1px dotted currentColor; }
.part-dual-heading:hover, .part-dual-heading:focus-visible { opacity:1; text-decoration:underline; }
.part-dual-chip { margin-right:.35rem; margin-bottom:.2rem; }

/* Etapa 45: separate, localized language headings. */
.part-language-group { display:block; }
.part-language-section-label { display:block; font-size:.72rem; font-weight:700; letter-spacing:.075em; text-transform:uppercase; opacity:.65; line-height:1.35; margin:0 0 .4rem; }
.part-language-group .part-languages { margin-top:0; }
.part-dual-preparing { display:block; margin-top:.8rem; }
.part-dual-heading { display:inline-flex; align-items:center; gap:.35rem; margin:0 0 .4rem; font-size:.72rem; letter-spacing:.075em; text-transform:uppercase; font-weight:700; line-height:1.35; opacity:.7; border:0; text-decoration:none; color:inherit; }
.part-dual-heading:hover, .part-dual-heading:focus-visible { opacity:1; text-decoration:underline; }
.part-dual-variants { display:flex; flex-wrap:wrap; gap:.45rem; align-items:center; }
.part-dual-chip { margin:0; }

/* Etapa 46 — group languages with bilingual variants, separate purchase CTAs. */
.part-dual-preparing { margin-top: 8px; margin-bottom: 24px; }
.part-dual-heading { margin-bottom: 5px; }