body.book-open{overflow:hidden}
.edu-book{box-sizing:border-box;width:min(960px,96vw);max-height:96dvh;border:0;border-radius:22px;padding:18px 24px;background:#f5f9ff;color:#203962;box-shadow:0 24px 90px #10224266;font-family:Poppins,Arial,sans-serif;overflow:auto}
.edu-book::backdrop{background:#102747bd;backdrop-filter:blur(4px)}
.edu-book header{display:flex;align-items:center;justify-content:space-between;gap:12px}
.edu-book h2{font-size:18px;margin:0}
.edu-book button,.edu-book a{font:inherit;cursor:pointer}
.book-close{border:0;border-radius:50%;background:#e2ecff;font-size:28px!important;width:42px;height:42px;flex-shrink:0}
.book-stage{display:flex;justify-content:center;padding:14px 10px;perspective:1500px}
.book-paper{position:relative;max-width:100%;box-shadow:5px 5px 0 #ddd,9px 9px 0 #eee,12px 14px 25px #22334c40;background:white;border-radius:2px}
.book-image{display:block;width:auto;height: min(62dvh,690px);max-width:100%;object-fit:contain;touch-action:pan-y}
.book-leaf{position:absolute;inset:0;pointer-events:none;transform-style:preserve-3d;transform-origin:left center}
.book-leaf img{width:100%;height:100%;object-fit:contain;background:#fff;backface-visibility:hidden}
.book-leaf.turn-next{animation:page-next .65s ease-in-out forwards}
.book-leaf.turn-prev{transform-origin:right center;animation:page-prev .65s ease-in-out forwards}
@keyframes page-next{0%{transform:rotateY(0);filter:brightness(1)}100%{transform:rotateY(-175deg);filter:brightness(.6);opacity:0}}
@keyframes page-prev{0%{transform:rotateY(0)}100%{transform:rotateY(175deg);filter:brightness(.6);opacity:0}}
.book-status{text-align:center;font-size:13px;margin:8px}
.edu-book nav,.edu-book footer{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;margin:10px 0}
.edu-book nav button,.edu-book footer a,.book-fav{border:0;border-radius:24px;background:#3268df;color:white;padding:10px 19px;text-decoration:none;font-size:13px}
.edu-book footer a{background:#3c922d}.edu-book .book-fav{background:#e6edfc;color:#203962}
.edu-book button:disabled{opacity:.4;cursor:default}
.edu-book details{max-width:650px;margin:12px auto 0;font-size:12px}.edu-book summary{cursor:pointer}.edu-book details p{line-height:1.7}
.edu-book :focus-visible{outline:3px solid #eea711;outline-offset:3px}
@media(max-width:600px){.edu-book{padding:12px;width:98vw;max-height:98dvh}.edu-book h2{font-size:14px}.book-image{height:auto;max-height:65dvh;width:100%}.book-paper{max-width:100%}.edu-book footer{gap:6px}.edu-book footer a,.book-fav{padding:9px 12px;font-size:11px}}
@media(prefers-reduced-motion:reduce){.book-leaf{animation:none!important}}
.book-zoom{border:0;border-radius:24px;background:#e6edfc;color:#203962;padding:10px 19px;font-size:13px!important}.edu-book.zoomed .book-image{height:auto;max-height:none;width:100%;max-width:100%}.edu-book.zoomed .book-paper{width:100%}