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#2d1e0f59}.open-book-desk{flex-direction:column;justify-content:center;align-items:center;width:100%;max-width:1040px;margin:0 auto;display:flex;position:relative}.open-book-hardcover{background:linear-gradient(145deg,#2a1a12 0%,#1d110a 50%,#110804 100%);border:1px solid #d4af3773;border-radius:14px;width:100%;padding:16px 18px 20px;position:relative;box-shadow:0 36px 90px #0c070480,0 14px 32px #0c070459,inset 0 0 0 1px #ffffff14,inset 0 0 0 4.5px #1a0f08,inset 0 0 0 6px #d4af3761}.book-corner{pointer-events:none;z-index:9;border-style:solid;border-color:#d4af378c;width:22px;height:22px;position:absolute}.book-corner-tl{border-width:2px 0 0 2px;border-top-left-radius:6px;top:7px;left:7px}.book-corner-tr{border-width:2px 2px 0 0;border-top-right-radius:6px;top:7px;right:7px}.book-corner-bl{border-width:0 0 2px 2px;border-bottom-left-radius:6px;bottom:7px;left:7px}.book-corner-br{border-width:0 2px 2px 0;border-bottom-right-radius:6px;bottom:7px;right:7px}.open-book-spread{background-color:#faf6ee;border-radius:6px;align-items:stretch;width:100%;min-height:560px;display:flex;position:relative;overflow:hidden;box-shadow:0 1px #ede4d3,0 2px #e2d7c2,0 3px #d8ccb5,0 4px #cebfab,0 5px #c4b39e,0 16px 36px #00000061,inset 0 0 35px #bea0781f}.book-page-left,.book-page-right{background-color:#faf6ee;background-image:radial-gradient(circle,#ffffffc7 0%,#f7f1e6f2 100%);flex-direction:column;flex:1;justify-content:space-between;padding:32px 38px 24px;display:flex;position:relative}.book-page-left{border-right:1px solid #6e553c24;box-shadow:inset -24px 0 26px -14px #32231424}.book-page-right{box-shadow:inset 24px 0 26px -14px #32231424}.book-center-gutter{pointer-events:none;z-index:10;background:linear-gradient(90deg,#28190f08 0%,#28190f38 50%,#28190f08 100%);width:26px;position:absolute;top:0;bottom:0;left:50%;transform:translate(-50%);box-shadow:-1px 0 2px #00000014,1px 0 2px #00000014}.book-silk-ribbon{clip-path:polygon(0 0,100% 0,100% 100%,50% calc(100% - 9px),0 100%);pointer-events:none;z-index:20;background:linear-gradient(90deg,#6e1212 0%,#991e1e 25%,#d43838 50%,#991e1e 75%,#540c0c 100%);width:13px;position:absolute;top:6px;bottom:5px;left:50%;transform:translate(-50%);box-shadow:2px 4px 8px #0000006b,inset 0 1px 1px #fff6}@keyframes pageTurnEffect{0%{opacity:.75;filter:brightness(.96);transform:rotateY(5deg)scale(.99)}to{opacity:1;filter:brightness();transform:rotateY(0)scale(1)}}.page-turn-active{transform-origin:0;animation:.35s cubic-bezier(.2,.8,.2,1) pageTurnEffect}.book-drop-cap{float:left;font-family:var(--font-heading), "Playfair Display", Georgia, serif;color:#6a2218;padding-top:2px;padding-left:2px;padding-right:9px;font-size:38px;font-weight:800;line-height:34px}.toc-row{cursor:pointer;border:1px solid #0000;border-radius:7px;justify-content:space-between;align-items:center;width:100%;padding:8px 12px;transition:all .2s;display:flex}.toc-row:hover{transform:translate(2px);background-color:#c4a4621f!important;border-color:#c4a4624d!important}.toc-row.active{background-color:#c4a46229!important;border:1px solid #c4a46273!important;border-left:3.5px solid #8c2b18!important}.materials-top-tabs{z-index:8;gap:6px;max-width:calc(100% - 40px);display:flex;position:absolute;top:-33px;left:36px}@media (width<=860px){.open-book-hardcover{padding:14px 10px 16px}.open-book-spread{flex-direction:column;min-height:auto}.book-center-gutter,.book-silk-ribbon{display:none}.book-page-left{box-shadow:none;border-bottom:2px dashed #d6c8b4;border-right:none;padding:22px 16px}.book-page-right{box-shadow:none;padding:22px 16px}.materials-top-tabs{scrollbar-width:none;gap:4px;top:-30px;left:14px;overflow-x:auto}.materials-top-tabs::-webkit-scrollbar{display:none}.materials-top-tabs button{padding:6px 12px 7px!important;font-size:10px!important}}