.interactive-book-stage{padding:55px 30px 35px;overflow:visible;min-width:0}
.interactive-book-stage:before{bottom:100px}
.book-reader{width:100%;max-width:570px;perspective:1800px;margin:20px auto 25px}
.book-spread{position:relative;width:100%;aspect-ratio:17/11;transform-style:preserve-3d;transform:translateX(-25%) rotateY(-12deg);transition:transform 1.1s ease}
.book-leaf{position:absolute;top:0;width:50%;height:100%;background:#f7f4eb;box-shadow:5px 8px 20px #0005;border-radius:2px;overflow:hidden}
.book-leaf img{width:100%;height:100%;object-fit:contain;display:block}
.book-left{left:0;opacity:0;transition:opacity .25s .35s;box-shadow:inset -7px 0 12px #0003}
.book-right{right:0;border-right:7px solid #dedbce;border-bottom:5px solid #dedbce}
.turning-cover{position:absolute;top:0;left:50%;width:50%;height:100%;transform-origin:left center;transform-style:preserve-3d;transform:translateZ(3px);transition:transform 1.1s ease;z-index:3}
.cover-front,.cover-back{position:absolute;inset:0;backface-visibility:hidden;border-radius:2px 5px 5px 2px;box-shadow:5px 8px 20px #0007}
.cover-front img{width:100%;height:100%;display:block;object-fit:fill}
.cover-back{background:#132c44;transform:rotateY(180deg);border:9px solid #193650}
.book-reader.open .book-spread{transform:rotateX(5deg)}
.book-reader.open .turning-cover{transform:translateZ(3px) rotateY(-180deg);z-index:0}
.book-reader.open .book-left{opacity:1;z-index:2}
.book-controls{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;position:relative;z-index:4}
.book-controls button,#book-sample-dialog nav button{font:14px 'Century Gothic','Segoe UI',sans-serif;color:#e4f1f6;background:#143847;border:1px solid #7894a0;padding:12px 17px;cursor:pointer;border-radius:2px}
.book-controls button:hover,.book-controls button:focus-visible{background:#d5e8ef;color:#0b2634}
.book-controls [hidden]{display:none}
.book-sample-caption{text-align:center;color:#b4cdd8;font-size:12px;line-height:1.6;margin:17px 0 0}
#book-sample-dialog{width:min(900px,94vw);max-height:92dvh;overflow:auto;background:#0b2431;color:#e5f0f4;border:1px solid #7b9daa;padding:20px}
#book-sample-dialog::backdrop{background:#000b;backdrop-filter:blur(5px)}
#book-sample-dialog header{display:flex;align-items:center;justify-content:space-between;gap:15px;position:sticky;top:-20px;background:#0b2431;padding:12px 0;z-index:2}
#book-sample-dialog h2{font-size:24px;margin:0}
#book-dialog-close{background:transparent;color:white;border:1px solid #abc0cb;font-size:26px;cursor:pointer;min-width:44px;min-height:44px}
#book-sample-dialog nav{display:flex;gap:10px;flex-wrap:wrap;margin:10px 0}
#book-sample-dialog nav button[aria-pressed=true]{background:#d4e8f0;color:#102b38}
#book-sample-dialog>img{display:block;width:100%;height:auto;background:white}
#book-sample-dialog>p{font-size:12px;color:#b6cdd8}
@media(max-width:800px){.interactive-book-stage{padding:20px 6% 45px}.book-reader{max-width:580px}.book-controls button{min-height:44px}.book-sample-caption{font-size:11px}}
@media(prefers-reduced-motion:reduce){.book-spread,.turning-cover,.book-left{transition:none}}

.cover-back{border:0;background:#f7f4eb}.cover-back img{width:100%;height:100%;display:block;object-fit:contain}
#book-sample-dialog{position:fixed;inset:0;margin:auto;height:fit-content;transform:none;max-width:94vw}