.book-stage{--w:300px;--h:432px;--d:54px;--hw:calc(var(--w) / 2);--hh:calc(var(--h) / 2);--hd:calc(var(--d) / 2);--nhw:calc(var(--w) / -2);--nhh:calc(var(--h) / -2);--nhd:calc(var(--d) / -2);--fore-radius:24px;--rx:-10deg;--ry:28deg;--rz:-3deg;--cover-hi:#262626;--cover-lo:#0c0d0d;--spine-hi:#202123;--spine-lo:#0b0c0c;--paper:#f6f6f3;--paper-line:#dcdcd5;--paper-hi:#fbfbf9;--paper-shade:#e9e9e3;--gold:#c9a72a;--ink-white:#ffffff;--ink-grey:#c9c9c9;position:absolute;inset:0;display:grid;place-items:center;font-family:var(--font-geist),system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;opacity:0;animation:bm-stageIn .9s ease .05s forwards}.book-stage,.book-stage *{box-sizing:border-box}.book-stage .scene{width:var(--w);height:var(--h);perspective:1600px;perspective-origin:50% 42%}.book-stage .tilt{width:100%;height:100%;transform-style:preserve-3d;transform:rotateX(var(--mx,0deg)) rotateY(var(--my,0deg));transition:transform .35s cubic-bezier(.22,.61,.36,1)}.book-stage 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.front:after{content:"";position:absolute;inset:0;border-radius:inherit;background:linear-gradient(90deg,rgba(255,255,255,.05) 0 1px,transparent 6px 12px,rgba(255,255,255,.035) 13px 14px,transparent 14px),linear-gradient(90deg,rgba(0,0,0,.45),transparent 14%,transparent 86%,rgba(0,0,0,.35));pointer-events:none}.book-stage .back{transform:rotateY(180deg) translateZ(var(--hd));border-radius:2px 13px 13px 2px;background:radial-gradient(120% 120% at 70% 30%,#1b1b1b 0,#0c0c0c 70%);box-shadow:inset 0 0 0 1px rgba(255,255,255,.03)}.book-stage .spine{width:var(--d);height:var(--h);margin-left:var(--nhd);margin-top:var(--nhh);transform:rotateY(-90deg) translateZ(var(--hw));background:linear-gradient(90deg,var(--spine-lo),var(--spine-hi) 42%,#16181a 60%,var(--spine-lo)),repeating-linear-gradient(90deg,rgba(255,255,255,.03) 0 1px,transparent 1px 4px);box-shadow:inset 0 0 18px rgba(0,0,0,.55)}.book-stage .spine 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