:root{--ivory:#f4f3e9;--paper:#fffef8;--mint:#dae8dc;--green:#164c3b;--ink:#223f35;--muted:#62776b;--line:#cbd4c6;--page-ratio:893/1263}
*{box-sizing:border-box}
body{margin:0;min-height:100svh;color:var(--ink);font-family:"Palatino Linotype","Book Antiqua","Songti SC","SimSun",serif;background:radial-gradient(ellipse at 88% 45%,#dce9dc 0,transparent 58%),radial-gradient(ellipse at 9% 60%,#fffdf3 0,transparent 60%),var(--ivory)}
body::before{content:"";position:fixed;inset:0;pointer-events:none;opacity:.2;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' opacity='.2' filter='url(%23n)'/%3E%3C/svg%3E")}
.masthead,footer{position:relative;display:flex;align-items:center;justify-content:space-between;margin:0 5vw;padding:23px 0;border-bottom:1px solid var(--line)}
.brand{display:flex;gap:13px;align-items:center;color:var(--green);text-decoration:none;font-size:19px;font-weight:bold;letter-spacing:3px}
.brand-logo{display:block;width:150px;height:auto}
.brand small{display:block;font-size:8px;letter-spacing:1.8px;font-weight:normal;margin-top:6px}
.edition{display:flex;align-items:center;gap:10px;font-size:12px;letter-spacing:2px}.edition-dot{height:6px;width:6px;border-radius:50%;background:var(--green)}.edition-year{color:var(--muted)}
main{position:relative;max-width:1500px;margin:auto;padding:22px 5vw 15px}.reader-heading{display:flex;justify-content:space-between;font-size:10px;letter-spacing:2px;color:var(--muted);margin:0 auto 13px;max-width:1120px}.reader-heading span:last-child{letter-spacing:2px}
.stage{display:flex;align-items:center;justify-content:center;min-height:220px;padding:6px 18px 18px;perspective:2200px;touch-action:pan-y}
.book{position:relative;display:flex;width:min(100%,calc(max(360px,100svh - 340px)*1.414));aspect-ratio:1786/1263;filter:drop-shadow(0 22px 22px #1e463325);isolation:isolate}
.book.single{width:min(50%,calc(max(360px,100svh - 340px)*.707));aspect-ratio:var(--page-ratio)}
.page{position:relative;width:50%;height:100%;background:var(--paper);box-shadow:0 2px 0 #b5bda9,0 4px 0 #e1e2d3,0 5px 0 #acb7a3;overflow:hidden}.single .page{width:100%}.page img{display:block;width:100%;height:100%;object-fit:contain;background:white}.page::after{content:"";position:absolute;inset:0;pointer-events:none;background:linear-gradient(90deg,#15332800 94%,#1533280c 99%,#15332818)}.page+.page::after{background:linear-gradient(90deg,#15332819,#15332805 3%,transparent 9%)}
.flip{position:absolute;top:0;right:0;width:50%;height:100%;transform-origin:left center;transform-style:preserve-3d;z-index:4;animation:turn-forward 620ms cubic-bezier(.28,.05,.2,1) forwards;pointer-events:none}.single .flip,.flip.mobile{width:100%}.flip.backward{right:auto;left:0;transform-origin:right center;animation-name:turn-backward}.flip-face{position:absolute;inset:0;backface-visibility:hidden;background:white;box-shadow:0 10px 25px #123b3133}.flip-face img{width:100%;height:100%;object-fit:contain}.flip-face::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,#152d2829,transparent 20%,#152d2805 70%,#152d2826)}.flip-face.back{transform:rotateY(180deg)}
@keyframes turn-forward{0%{transform:rotateY(0)}100%{transform:rotateY(-180deg)}}
@keyframes turn-backward{0%{transform:rotateY(0)}100%{transform:rotateY(180deg)}}
.toolbar{display:flex;justify-content:center;align-items:center;gap:19px;margin:9px auto 0;width:fit-content;padding:8px 12px;background:#fffef7bf;border:1px solid #ffffff;border-radius:5px;box-shadow:0 5px 20px #1d493407}
button,input{font:inherit;color:inherit}button{cursor:pointer;border:0;background:none;border-radius:3px;min-height:42px}button:disabled{opacity:.32;cursor:default}.turn-button{display:flex;gap:13px;align-items:center;padding:0 14px;font-size:12px;letter-spacing:1px}.turn-button span[aria-hidden]{font-size:23px;line-height:1}.turn-button:not(:disabled):hover,.jump-button:hover{background:var(--mint)}button:focus-visible,input:focus-visible,a:focus-visible{outline:2px solid var(--green);outline-offset:4px}.page-position{display:flex;align-items:baseline;justify-content:center;gap:8px;min-width:94px;font-variant-numeric:tabular-nums}#page-status{font-size:23px;letter-spacing:1px}.page-total{font-size:12px;color:var(--muted)}.toolbar-divider{width:1px;height:22px;background:var(--line)}form{display:flex;align-items:center;gap:10px;font-size:12px}input{width:50px;min-height:34px;border:1px solid var(--line);border-radius:2px;background:#ffffff70;text-align:center;font-size:14px;appearance:textfield}input::-webkit-inner-spin-button{appearance:none}.jump-button{font-size:11px;letter-spacing:1px;padding:0 9px;color:var(--green)}
.instructions{text-align:center;color:var(--muted);font-size:10px;letter-spacing:1px;margin:18px 0 0}.instruction-separator{margin:0 12px}.mobile-tip{display:none}footer{border-bottom:0;border-top:1px solid var(--line);font-size:10px;letter-spacing:1px;color:var(--muted);padding:18px 0}.error{text-align:center;color:#9a3525;font-size:13px}
@media(min-width:1600px){main{padding-top:30px}.reader-heading{margin-bottom:20px}}
@media(max-width:900px),(pointer:coarse){.masthead{margin:0 6vw;padding:18px 0}.brand{font-size:17px;letter-spacing:2px}.brand-mark{width:29px;height:35px;font-size:22px}.brand small{font-size:7px;letter-spacing:1px}.edition{font-size:10px;gap:7px;letter-spacing:0}.edition-year{display:none}main{padding:20px 5vw 22px}.reader-heading{font-size:8px;letter-spacing:1.5px;margin-bottom:14px}.reader-heading span:last-child{display:none}.stage{padding:0 9px 17px}.book,.book.single{width:min(100%,calc((100svh - 305px)*.707));min-width:170px;aspect-ratio:var(--page-ratio)}.page{width:100%}.toolbar{gap:5px;padding:5px 6px;margin-top:8px;max-width:100%}.button-text{display:none}.turn-button{padding:0 10px;min-width:39px;justify-content:center}.page-position{min-width:77px;gap:5px}#page-status{font-size:21px}.toolbar-divider{margin:0 5px}form{gap:6px}form label{font-size:10px}input{width:39px}.jump-button{padding:0 6px;font-size:10px}.instructions{font-size:9px;line-height:1.8;margin-top:13px;letter-spacing:0}.desktop-tip{display:none}.mobile-tip{display:inline}.instruction-separator{margin:0 7px}footer{margin:0 6vw;font-size:9px;padding:15px 0}footer span:last-child{display:none}}
@media(prefers-reduced-motion:reduce){.flip{animation:none!important}}
@media(max-width:900px),(pointer:coarse){.brand-logo{width:130px}.book,.book.single{width:100%;max-width:560px;min-width:0}.masthead{padding:8px 0}.toolbar{flex-wrap:wrap;row-gap:2px}.stage{min-height:0}.brand-mark{display:none}}