:root{color-scheme:light;--blue:#002fa7;--ink:#4a322e;--paper:#faf9f6}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:14px/1.5 Arial,sans-serif}header{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:18px 30px;border-bottom:1px solid #dedbd3}header div{text-align:center}header strong,header span{display:block}header span{font-size:12px;color:#6f6258}a{color:inherit;text-underline-offset:4px}button,input{font:inherit}button{min-width:44px;min-height:44px;padding:8px 14px;border:1px solid #d9d6cf;border-radius:5px;background:#fff;color:var(--ink);cursor:pointer}button:hover:not(:disabled){border-color:var(--blue);color:var(--blue)}button:disabled{opacity:.35;cursor:default}:focus-visible{outline:2px solid var(--blue);outline-offset:3px}main{padding:18px 24px;background:var(--paper)}.stage{height:calc(100dvh - 260px);min-height:260px;max-height:1000px;overflow:auto;display:flex;align-items:safe center;justify-content:safe center;background:#eae8e2;padding:16px;perspective:1800px;touch-action:pan-x pan-y pinch-zoom}.stage img{display:block;max-width:100%;max-height:100%;width:auto;height:auto;flex:none;box-shadow:0 5px 24px #302a2528;user-select:none;transform-origin:center}.stage.zoomed{display:block}.stage.zoomed img{max-width:none;max-height:none;margin:auto}.turn-forward{animation:forward .24s ease-out}.turn-back{animation:back .24s ease-out}@keyframes forward{from{opacity:.4;transform:rotateY(-7deg) translateX(14px)}to{opacity:1;transform:none}}@keyframes back{from{opacity:.4;transform:rotateY(7deg) translateX(-14px)}to{opacity:1;transform:none}}.toolbar{display:flex;justify-content:center;align-items:center;gap:12px;flex-wrap:wrap;margin:16px auto 8px}.page-control{display:flex;gap:8px;align-items:center;white-space:nowrap}input{width:55px;min-height:44px;text-align:center;background:white;border:1px solid #d9d6cf;border-radius:5px;color:var(--ink)}.zoom-controls{display:flex;gap:8px;align-items:center;margin-left:20px}output{width:48px;text-align:center}.hint{text-align:center;margin:6px 0;color:#6f6258;font-size:12px}.help{font-size:11px}details{max-width:1000px;margin:20px auto}summary{cursor:pointer;min-height:44px;display:list-item;padding:12px 0}#page-text{white-space:pre-wrap;overflow-wrap:anywhere;color:#62574f;padding:16px;background:white}#reader:fullscreen{overflow:auto;height:100dvh}#reader:fullscreen .stage{height:calc(100dvh - 180px)}#error{text-align:center}@media(max-width:600px){header{padding:12px 16px;gap:10px}header div{display:none}main{padding:12px 10px}.stage{padding:6px;height:calc(100dvh - 285px);min-height:240px}.toolbar{gap:8px}.toolbar>button span{display:none}.zoom-controls{margin-left:0;justify-content:center;width:100%}.help{max-width:280px;margin-inline:auto}}@media(prefers-reduced-motion:reduce){.turn-forward,.turn-back{animation:none}}
/* Facing portrait pages, with a sheet rotating around the spine. */
.stage{perspective:none;overflow:auto;background:#e9e6df;padding:24px;touch-action:pan-x pan-y pinch-zoom}.book{position:relative;flex:none;perspective:2200px;transform-style:preserve-3d}.leaf{position:absolute;top:0;width:50%;height:100%;background:#fff;overflow:hidden;box-shadow:0 4px 16px #302a2520;cursor:pointer}.left{left:0}.right{right:0}.leaf.empty{background:transparent;box-shadow:none;pointer-events:none}.leaf img,.face img{position:absolute;top:0;width:200%;height:100%;max-width:none;max-height:none;box-shadow:none;object-fit:fill;user-select:none;pointer-events:none}.leaf img.half-right,.face img.half-right{left:-100%}.leaf img.half-left,.face img.half-left{left:0}.leaf img.cover,.face img.cover{width:100%;left:0}.leaf:not(.empty)::after{content:'';position:absolute;inset:0;pointer-events:none}.left:not(.empty)::after{background:linear-gradient(to left,#00000012,transparent 5%)}.right:not(.empty)::after{background:linear-gradient(to right,#00000012,transparent 5%)}.turner{display:none;position:absolute;top:0;left:50%;width:50%;height:100%;transform-origin:left center;transform-style:preserve-3d;z-index:5}.face{position:absolute;inset:0;background:white;overflow:hidden;backface-visibility:hidden;-webkit-backface-visibility:hidden;box-shadow:0 4px 24px #302a2538}.face.back{transform:rotateY(180deg)}.face::after{content:'';position:absolute;inset:0;background:linear-gradient(90deg,#00000019,transparent 30%,#00000006);pointer-events:none}.book.single .leaf{width:100%;left:0}.book.single .left{display:none}.book.single .right::after{background:none}.stage.zoomed{display:flex}.stage.zoomed img{margin:0}.book.single .turner{display:none!important}.book.single.enter-next{animation:singleNext .3s ease-out}.book.single.enter-prev{animation:singlePrev .3s ease-out}@keyframes singleNext{from{opacity:.5;transform:translateX(18px)}to{opacity:1;transform:none}}@keyframes singlePrev{from{opacity:.5;transform:translateX(-18px)}to{opacity:1;transform:none}}@media(prefers-reduced-motion:reduce){.book.single{animation:none}}@media(max-width:600px){.stage{padding:12px}}
/* Keep drawings seamless when the book is resting. */
.leaf { box-shadow:none; }
.leaf:not(.empty)::after { background:none; }
.face { box-shadow:0 3px 12px #302a2518; }
.face::after { background:linear-gradient(90deg,#00000008,transparent 12%); }
.face { box-shadow:0 2px 7px #302a250c; }
.face::after { background:none; }
.stage { background:#f0efeb; }

/* Rotating sheets must not change the scrollable area or recenter the book. */
.stage:not(.zoomed){overflow:clip}
.stage.zoomed{overflow:auto}