:root{--navy:#051a3d;--blue:#073b91;--red:#ed1c24;--muted:#b7c9dd}
*{box-sizing:border-box}html,body{margin:0;width:100%;height:100%;background:radial-gradient(circle at 50% 35%,#17355b 0,#081729 48%,#030b15 100%);color:#fff;font-family:Inter,system-ui,-apple-system,"Segoe UI",sans-serif}
body{display:grid;grid-template-rows:auto minmax(0,1fr) auto;overflow:hidden}body.is-embedded{grid-template-rows:minmax(0,1fr) auto}
button,a{font:inherit}button:focus-visible,a:focus-visible{outline:3px solid #fff;outline-offset:3px}
.flip-head{display:grid;grid-template-columns:52px minmax(0,1fr) auto;align-items:center;gap:12px;padding:10px 16px;background:linear-gradient(90deg,var(--navy),var(--blue));border-bottom:3px solid var(--red)}
.flip-head small{font-size:.62rem;letter-spacing:.09em;color:#b6d9ff;font-weight:900}.flip-head h1{overflow:hidden;margin:2px 0 0;font-size:clamp(1rem,2vw,1.45rem);text-overflow:ellipsis;white-space:nowrap}
.flip-close{display:grid;place-items:center;width:42px;height:42px;padding:0;border:0;border-radius:50%;background:rgba(255,255,255,.1);color:#fff;font-size:2rem;cursor:pointer}.flip-download{padding:10px 13px;border-radius:10px;background:#fff;color:var(--blue);font-weight:900;text-decoration:none;font-size:.78rem}
.flip-stage{min-height:0;display:grid;grid-template-columns:56px minmax(0,1fr) 56px;align-items:center;justify-items:center;gap:8px;padding:10px}
.book-shell{position:relative;display:grid;width:100%;height:100%;min-width:0;min-height:0;place-items:center;overflow:hidden}.book-shell #book{opacity:0;transition:opacity .18s ease}.book-shell #book.is-ready{opacity:1}.book-loading{position:absolute;inset:0;display:grid;place-items:center;color:var(--muted);font-weight:800}
.stf__parent{margin:auto!important;max-width:100%!important;max-height:100%!important}.stf__wrapper{max-width:100%;max-height:100%;filter:drop-shadow(0 20px 28px rgba(0,0,0,.48))}.stf__item{background:#fff}.stf__item canvas{display:block}
.flip-nav,.flip-controls button{border:1px solid rgba(255,255,255,.16);background:rgba(255,255,255,.09);color:#fff;cursor:pointer;backdrop-filter:blur(8px)}.flip-nav{display:grid;place-items:center;width:46px;height:72px;border-radius:14px;font-size:2.4rem}.flip-nav:disabled,.flip-controls button:disabled{opacity:.28;cursor:not-allowed}
.flip-controls{display:flex;justify-content:center;align-items:center;gap:14px;min-height:48px;padding:8px;background:rgba(3,11,21,.9);border-top:1px solid rgba(255,255,255,.1);font-size:.78rem;color:var(--muted)}.flip-controls b{color:#fff}.flip-controls button{width:42px;height:32px;border-radius:8px}
@media(max-width:700px){.flip-stage{grid-template-columns:38px minmax(0,1fr) 38px;padding:6px 2px}.flip-nav{width:34px;height:54px;border-radius:10px;font-size:2rem}.flip-head{grid-template-columns:42px minmax(0,1fr)}.flip-download{grid-column:1/-1;text-align:center;padding:7px}.flip-controls{padding-right:58px;font-size:.72rem}}
@media(prefers-reduced-motion:reduce){.book-shell #book{transition:none}}