.book-intro{padding:55px 6% 35px}.book-intro h1{font-size:clamp(42px,6vw,78px);margin:22px 0}.book-intro p{max-width:730px}.reader{margin:0 3% 55px;background:#e9eef5;border:1px solid #d9e1ed;border-radius:16px;overflow:hidden}.reader:fullscreen{margin:0;border-radius:0;overflow:auto;background:#e9eef5}.reader-tools{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:12px;padding:18px;background:#f6f8fb}.reader button,.reader select{border:1px solid #c6d0de;background:white;border-radius:8px;padding:10px 13px;color:#172026;cursor:pointer;font:inherit;font-size:13px}.reader button:disabled{opacity:.4;cursor:default}.reader button[aria-pressed=true]{background:#285ce8;color:white}.reader label{font-size:13px}.book-viewport{overflow:auto;padding:30px 18px;touch-action:pan-y pinch-zoom;max-height:85vh}.book-spread{display:flex;justify-content:center;max-width:1100px;margin:auto;perspective:1800px;position:relative}.sheet{display:block;width:50%;height:auto;align-self:flex-start;box-shadow:0 12px 24px #17202626;cursor:pointer;background:white}.sheet+ .sheet{border-left:1px solid #d4d4d4}.reader[data-mode=scroll] .book-spread{display:block;max-width:760px}.reader[data-mode=scroll] .sheet{width:100%;margin-bottom:24px;cursor:default}.reader-status{text-align:center;font-size:12px;color:#526375;padding:0 12px 16px}.reader.zoom .book-spread{max-width:none;width:180%;min-width:1000px}.reader.zoom .book-viewport{touch-action:pan-x pan-y}.reader.zoom[data-mode=scroll] .book-spread{width:130%;min-width:700px}.turn-leaf{position:absolute;top:0;width:50%;height:100%;object-fit:fill;backface-visibility:hidden;z-index:3;transform-style:preserve-3d;pointer-events:none}.turn-next{right:0;transform-origin:left;animation:turn-next .55s ease-in-out forwards}.turn-prev{left:0;transform-origin:right;animation:turn-prev .55s ease-in-out forwards}@keyframes turn-next{to{transform:rotateY(-180deg)}}@keyframes turn-prev{to{transform:rotateY(180deg)}}.book-text{max-width:850px;margin:0 auto;padding:35px 6% 75px}.book-text h2{font-size:36px;margin-bottom:22px}.text-page{border-bottom:1px solid #dfe4e7;padding:20px 0}.text-page h3{font-size:21px}.text-page p{white-space:pre-wrap;line-height:1.8}.reader-help{text-align:center;font-size:13px;padding:0 15px 15px}.book-download{display:flex;gap:15px;align-items:center;flex-wrap:wrap}.book-download .button{margin:0}.reader button:focus-visible{outline:3px solid #285ce8;outline-offset:3px}@media(max-width:700px){.reader{margin-inline:2%}.sheet{width:100%}.book-viewport{padding:14px 8px}.turn-leaf{width:100%}.reader-tools{gap:8px;padding:12px}.book-intro{padding-top:35px}.reader-tools button{padding:10px}.book-text{padding-inline:6%}}@media(prefers-reduced-motion:reduce){.turn-leaf{animation:none;display:none}}