.kbt-flipbook{--kbt-bg:#171717;--kbt-panel:#232323;--kbt-text:#f4f4f4;--kbt-muted:#b8b8b8;--kbt-border:rgba(255,255,255,.13);margin:1.5rem 0;background:var(--kbt-bg);color:var(--kbt-text);border-radius:10px;overflow:hidden}.kbt-flipbook__heading{display:flex;align-items:flex-start;justify-content:space-between;gap:1rem;padding:1rem 1.25rem;background:#fff;color:#222;border:1px solid #e5e7eb;border-bottom:0}.kbt-flipbook__title{margin:0;font-size:1.15rem;line-height:1.35}.kbt-flipbook__status{margin-top:.25rem;font-size:.82rem;color:#666}.kbt-flipbook__pdf{font-weight:600;text-decoration:none;white-space:nowrap}.kbt-flipbook__toolbar{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:.5rem;padding:.7rem;background:var(--kbt-panel);border-bottom:1px solid var(--kbt-border)}.kbt-flipbook__toolbar button{appearance:none;border:1px solid var(--kbt-border);border-radius:5px;background:rgba(255,255,255,.06);color:var(--kbt-text);padding:.42rem .7rem;font-size:.85rem;font-weight:600;cursor:pointer}.kbt-flipbook__toolbar button:hover{background:rgba(255,255,255,.13)}.kbt-flipbook__counter{min-width:4.75rem;text-align:center;color:var(--kbt-muted);font-size:.85rem}.kbt-flipbook__viewport{position:relative;display:flex;align-items:center;justify-content:center;min-height:var(--kbt-flipbook-height,650px);padding:1.5rem;overflow:hidden}.kbt-flipbook__stage{width:100%;max-width:100%;margin:auto}.kbt-flipbook__error{position:absolute;inset:50% auto auto 50%;transform:translate(-50%,-50%);max-width:28rem;text-align:center;color:var(--kbt-muted)}.kbt-flipbook:fullscreen{width:100vw;height:100vh;border-radius:0}.kbt-flipbook:fullscreen .kbt-flipbook__viewport{height:calc(100vh - 110px);min-height:0}.kbt-flipbook-error{padding:1rem;border:1px solid #d9a3a3;background:#fff6f6;color:#7a2525}@media(max-width:700px){.kbt-flipbook__heading{display:block}.kbt-flipbook__pdf{display:inline-block;margin-top:.65rem}.kbt-flipbook__viewport{min-height:420px;padding:.75rem}.kbt-flipbook__toolbar button{padding:.38rem .55rem;font-size:.78rem}}


/* Book Archive */
.kbt-book-archive{max-width:1180px;margin:0 auto}.kbt-book-archive__intro{margin-bottom:24px}.kbt-book-archive__intro h2{margin-bottom:8px}.kbt-book-archive__search{display:flex;gap:8px;margin:0 0 28px}.kbt-book-archive__search input{flex:1;min-width:0;padding:10px 12px;border:1px solid #d1d5db;border-radius:4px}.kbt-book-archive__search button{padding:10px 16px}.kbt-book-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.kbt-book-card{border:1px solid #e5e7eb;background:#fff}.kbt-book-card__cover{display:block;aspect-ratio:4/3;background:#f3f4f6;overflow:hidden}.kbt-book-card__cover img{width:100%;height:100%;object-fit:cover}.kbt-book-card__placeholder{display:flex;width:100%;height:100%;align-items:center;justify-content:center;color:#6b7280;font-size:1.2rem}.kbt-book-card__body{padding:16px}.kbt-book-card__body h3{margin:0 0 6px;font-size:1.15rem}.kbt-book-card__original{margin-bottom:6px;color:#4b5563}.kbt-book-card__meta{font-size:.9rem;color:#6b7280}.kbt-book-card__body p{margin:10px 0 0}.kbt-book-archive__pagination{margin-top:28px}.kbt-book-single__meta{display:grid;grid-template-columns:140px 1fr;gap:8px 18px;margin:0 0 28px}.kbt-book-single__meta dt{font-weight:700}.kbt-book-single__meta dd{margin:0}@media(max-width:900px){.kbt-book-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:600px){.kbt-book-grid{grid-template-columns:1fr}.kbt-book-single__meta{grid-template-columns:1fr}.kbt-book-single__meta dd{margin-bottom:8px}}


/* KRP-backed book detail */
.kbt-remote-book{max-width:1180px;margin:0 auto}
.kbt-remote-book__back{margin:0 0 20px}
.kbt-remote-book__header{display:grid;grid-template-columns:minmax(0,240px) minmax(0,1fr);gap:32px;margin-bottom:28px}
.kbt-remote-book__cover img{display:block;width:100%;height:auto}
.kbt-remote-book__info h2{margin-top:0}
.kbt-remote-book__original{margin:-4px 0 18px;color:#6b7280;font-size:1.05rem}
.kbt-remote-book__description{margin-top:20px}
.kbt-remote-book__notes{margin-top:24px}
.kbt-book-archive__pagination{display:flex;gap:8px;flex-wrap:wrap}
.kbt-book-archive__pagination a,.kbt-book-archive__pagination .current{display:inline-block;padding:6px 10px;border:1px solid #d1d5db}
.kbt-book-archive__pagination .current{font-weight:700;background:#f3f4f6}
@media(max-width:700px){.kbt-remote-book__header{grid-template-columns:1fr}.kbt-remote-book__cover{max-width:260px}}


/* KRP canonical embedded book reader */

.kbt-book-krp-reader {
    width: 100%;
    margin: 28px 0;
    background: #ffffff;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    overflow: hidden;
}

.kbt-book-krp-reader__frame {
    display: block;
    width: 100%;
    height: 900px;
    min-height: 700px;
    border: 0;
    background: #ffffff;
}

@media (max-width: 768px) {
    .kbt-book-krp-reader__frame {
        height: 760px;
        min-height: 600px;
    }
}