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ease}.bookshelf-rack:hover{border-color:#fef08a7a;box-shadow:0 35px 90px -10px #000000fa,0 0 65px #f59e0b2e,inset 0 1px 1px #ffffff4d}.shelf-row{position:relative;display:flex;align-items:flex-end;justify-content:flex-start;gap:clamp(.6rem,1vw,1rem);padding:0 1.4rem 22px;flex-wrap:nowrap;overflow-x:auto;overflow-y:hidden;scrollbar-width:thin;scrollbar-color:rgba(245,158,11,.45) rgba(11,17,30,.6);scroll-behavior:smooth;min-height:clamp(270px,35vh,345px);-webkit-overflow-scrolling:touch}.shelf-row::-webkit-scrollbar{height:7px}.shelf-row::-webkit-scrollbar-track{background:#0b111e99;border-radius:4px}.shelf-row::-webkit-scrollbar-thumb{background:#f59e0b73;border-radius:4px}.shelf-row::-webkit-scrollbar-thumb:hover{background:#f59e0bcc}.shelf-plank{position:absolute;bottom:0;left:0;right:0;min-width:100%;width:max(100%,max-content);height:18px;background:linear-gradient(to bottom,#854d0e,#533107 40%,#291802);border-top:3px solid #b45309;border-radius:5px;box-shadow:0 12px 28px #000000e6,inset 0 2px 4px #fff3;z-index:1;pointer-events:none}.shelf-plank:after{content:"";position:absolute;top:100%;left:5%;right:5%;height:12px;background:#0009;filter:blur(6px)}.book-spine{flex-shrink:0;position:relative;width:clamp(64px,5vw,82px);height:clamp(248px,32vh,310px);background:linear-gradient(90deg,#182234,#2c3a50 35%,#3e4f68,#2c3a50 65%,#182234);border-radius:7px 7px 3px 3px;cursor:pointer;-webkit-user-select:none;user-select:none;z-index:5;display:flex;flex-direction:column;justify-content:space-between;align-items:center;padding:.9rem .4rem .75rem;transform-origin:bottom center;transition:transform .35s cubic-bezier(.16,1,.3,1),box-shadow .35s ease;box-shadow:3px 6px 18px #000c,inset -3px 0 8px #0009,inset 2px 0 6px 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1600px){.library-catalog-view{max-width:1280px;padding:1.6rem 2.4rem}.cosmic-doc-list{max-height:52vh}.library-view-container{max-width:1680px;gap:2.5rem}.bookshelf-rack{max-width:1100px}}.spine-navy{background:linear-gradient(90deg,#091a33,#15325b 35%,#1e457a,#15325b 65%,#091a33);border-left:1px solid #3b82f6}.spine-emerald{background:linear-gradient(90deg,#04251a,#0b4934 35%,#106f4f,#0b4934 65%,#04251a);border-left:1px solid #10b981}.spine-burgundy{background:linear-gradient(90deg,#2d0b12,#5a1725 35%,#832034,#5a1725 65%,#2d0b12);border-left:1px solid #f43f5e}.spine-amber{background:linear-gradient(90deg,#3d2303,#6d3e07 35%,#9b5a0b,#6d3e07 65%,#3d2303);border-left:1px solid #f59e0b}.spine-purple{background:linear-gradient(90deg,#200d3d,#421c7a 35%,#632cb8,#421c7a 65%,#200d3d);border-left:1px solid #8b5cf6}.spine-forest{background:linear-gradient(90deg,#102410,#1f4720 35%,#2d6b2f,#1f4720 65%,#102410);border-left:1px solid #22c55e}.spine-slate{background:linear-gradient(90deg,#131924,#242f42 35%,#35445e,#242f42 65%,#131924);border-left:1px solid #94a3b8}.spine-ruby{background:linear-gradient(90deg,#380808,#691111 35%,#961919,#691111 65%,#380808);border-left:1px solid #ef4444}.spine-indigo{background:linear-gradient(90deg,#15113d,#2b2378 35%,#4135b5,#2b2378 65%,#15113d);border-left:1px solid #6366f1}.spine-cyan{background:linear-gradient(90deg,#042730,#0a4f61 35%,#107791,#0a4f61 65%,#042730);border-left:1px solid #06b6d4}.spine-gold-custom{background:linear-gradient(90deg,#381e05,#683608 25%,#9a530f,#683608 75%,#381e05);border-left:2px solid #f59e0b;border-right:1px solid rgba(254,240,138,.35);box-shadow:3px 6px 20px #000000e6,inset -3px 0 10px #000c,inset 2px 0 8px #fef08a73,0 0 16px #f59e0b4d}.spine-gold-custom .spine-title-vertical{color:#fef08a;text-shadow:0 1px 4px rgba(0,0,0,.95),0 0 8px rgba(245,158,11,.4)}.spine-gold-custom:hover{box-shadow:0 25px 50px #000000f2,0 0 35px #f59e0ba6;border-left-color:#fde047}.book-spine-upload{background:linear-gradient(135deg,#f59e0b26,#10b98126);border:2px dashed var(--accent-gold);color:var(--accent-gold);box-shadow:0 8px 25px #f59e0b40;animation:pulseUploadSlot 2.5s infinite ease-in-out}.book-spine-upload:hover{background:linear-gradient(135deg,#f59e0b4d,#10b9814d);border-color:#fde047;transform:translateY(-20px) scale(1.05)}.book-spine-upload .spine-title-vertical{color:#fde047;font-weight:800}@keyframes pulseUploadSlot{0%,to{box-shadow:0 0 15px #f59e0b33}50%{box-shadow:0 0 25px #f59e0b80}}.open-book-modal-backdrop{position:fixed;top:0;left:0;width:100vw;height:100vh;background:#04060ad9;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);z-index:300;display:flex;align-items:center;justify-content:center;padding:clamp(.5rem,1.8vh,1.25rem);animation:fadeInModal .3s ease}@keyframes fadeInModal{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}.open-notebook-spread{width:min(94vw,1360px);max-width:1360px;min-height:clamp(520px,75vh,760px);height:clamp(540px,80vh,780px);max-height:90vh;background:#fbf7ee;border-radius:18px;border:1px solid #d4c39c;box-shadow:0 0 0 7px #2e1c12,0 0 0 9px #d4a34b,4px 4px #ede4cc,8px 8px #e4d7b8,0 35px 90px #000000f2,0 0 40px #f59e0b33;display:grid;grid-template-columns:1fr 1fr;position:relative;overflow:hidden;animation:bookOpenSpread .45s cubic-bezier(.16,1,.3,1) forwards}@keyframes bookOpenSpread{0%{transform:perspective(1000px) rotateX(8deg) scale(.92);opacity:.6}to{transform:perspective(1000px) rotateX(0) scale(1);opacity:1}}.open-notebook-spread:before{content:"";position:absolute;top:0;bottom:0;left:50%;width:36px;transform:translate(-50%);background:linear-gradient(to right,#00000029,#0000000d 35%,#00000003,#0000000d 65%,#00000029);box-shadow:inset 0 0 8px 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#00000026;z-index:6;pointer-events:none}.study-choice-header h4{font-size:clamp(1.35rem,2.2vh,1.6rem);font-weight:800;color:#0f172a;margin-bottom:.3rem;line-height:1.25}.study-choice-header p{font-size:clamp(.88rem,1.15vh,.98rem);color:#334155;font-weight:500;line-height:1.45}.study-options-mini-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(.85rem,1.5vh,1.15rem)}.btn-study-choice-card{background:#ffffffd9;border:1px solid rgba(138,90,30,.32);border-radius:14px;padding:clamp(1.05rem,1.8vh,1.35rem) clamp(.95rem,1.2vw,1.25rem);min-height:clamp(76px,9.5vh,92px);cursor:pointer;text-align:left;display:flex;align-items:center;gap:.85rem;box-shadow:0 4px 12px #00000014;transition:all var(--transition-normal)}.btn-study-choice-card:hover{border-color:#b45309;background:#fff;transform:translateY(-2px);box-shadow:0 8px 24px #b4530947}.btn-study-choice-card.selected{background:#fffbeb;border-color:#b45309;box-shadow:0 0 0 2px #b45309}.choice-icon{font-size:1.7rem}.choice-info strong{display:block;font-size:clamp(.94rem,1.2vh,1.05rem);color:#1e1b18;margin-bottom:.2rem;font-weight:800;line-height:1.25}.choice-info span{font-size:clamp(.78rem,1.05vh,.86rem);color:#475569;font-weight:500;line-height:1.35}.notebook-action-footer{display:flex;align-items:center;justify-content:space-between;border-top:1px solid rgba(138,90,30,.22);padding-top:clamp(.85rem,1.5vh,1.25rem);gap:clamp(.4rem,.75vw,.65rem);flex-wrap:nowrap;width:100%;box-sizing:border-box;margin-top:auto}.notebook-action-footer button{display:inline-flex;align-items:center;justify-content:center;white-space:nowrap;height:clamp(2.45rem,3.6vh,2.75rem);min-height:clamp(2.45rem,3.6vh,2.75rem);box-sizing:border-box;border-radius:9px;font-family:inherit;font-weight:700;-webkit-user-select:none;user-select:none;transition:all var(--transition-fast)}.btn-close-notebook-shelf{background:#ffffffe6;border:1px solid rgba(30,27,24,.3);color:#2e1c12;font-size:clamp(.82rem,1.05vh,.88rem);padding:0 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