:root{--primary:#4f46e5;--primary-hover:#4338ca;--primary-light:#e0e7ff;--primary-gradient:linear-gradient(135deg,#6366f1,#4f46e5);--bg-main:#f8fafc;--surface:#fff;--text-main:#0f172a;--text-muted:#64748b;--border-light:#e2e8f0;--radius-sm:6px;--radius-md:12px;--radius-lg:18px;--shadow-sm:0 1px 3px rgba(0,0,0,0.05);--shadow-md:0 4px 12px -2px rgba(15,23,42,0.08);--shadow-lg:0 20px 25px -5px rgba(15,23,42,0.12),0 8px 10px -6px rgba(15,23,42,0.04);--font-family:"Plus Jakarta Sans",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif}*{box-sizing:border-box}body{font-family:var(--font-family);margin:0;padding:0;background-color:var(--bg-main);color:var(--text-main);-webkit-font-smoothing:antialiased}.app-header{position:sticky;top:0;z-index:900;background:hsla(0,0%,100%,.85);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border-light);box-shadow:var(--shadow-sm)}.header-content{max-width:680px;margin:0 auto;padding:16px 24px;display:flex;justify-content:space-between;align-items:center}.header-title{margin:0;font-size:1.25rem;font-weight:800;background:var(--primary-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;letter-spacing:-.02em}.header-right{grid-gap:16px;gap:16px}.header-right,.user-selector{display:flex;align-items:center}.user-selector{font-size:.875rem;font-weight:600;color:var(--text-muted);height:34px}.username-text{font-weight:700;margin-left:6px;margin-right:10px;padding:0 10px;background-color:var(--primary-light);border-radius:20px}.change-user-btn,.username-text{color:var(--primary);height:32px;display:inline-flex;align-items:center;box-sizing:border-box}.change-user-btn{padding:0 12px;justify-content:center;font-size:.8125rem;font-weight:600;background-color:var(--surface);border:1px solid var(--primary-light);border-radius:var(--radius-sm);transition:all .2s ease}.change-user-btn:hover{background-color:var(--primary-light);border-color:var(--primary)}.user-input{height:32px;padding:0 10px;margin-left:6px;box-sizing:border-box;border-radius:var(--radius-sm);border:1px solid var(--border-light);background-color:var(--surface);font-size:.875rem;font-weight:600;color:var(--primary);width:120px;transition:all .2s ease}.user-input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(99,102,241,.2)}.apply-user-btn{height:32px;padding:0 12px;margin-left:6px;display:inline-flex;align-items:center;justify-content:center;font-size:.8125rem;font-weight:600;background:var(--primary-gradient);color:#fff;border-radius:var(--radius-sm);box-sizing:border-box}.apply-user-btn:hover{opacity:.92}.cancel-user-btn{height:32px;padding:0 12px;margin-left:4px;display:inline-flex;align-items:center;justify-content:center;font-size:.8125rem;font-weight:600;background-color:#f1f5f9;color:var(--text-muted);border-radius:var(--radius-sm);box-sizing:border-box}.cancel-user-btn:hover{background-color:#e2e8f0}.private-books-badge{height:32px;display:inline-flex;align-items:center;box-sizing:border-box;background-color:var(--primary-light);color:var(--primary);padding:0 14px;border-radius:20px;font-size:.8125rem;font-weight:700}.main-content{padding:32px 20px}.books-container{max-width:680px;margin:0 auto;background:var(--surface);padding:32px;border-radius:var(--radius-lg);box-shadow:var(--shadow-md);border:1px solid var(--border-light)}.books-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.books-header h2{margin:0;font-size:1.5rem;font-weight:800;color:var(--text-main);letter-spacing:-.02em}.add-book-trigger-btn{background:var(--primary-gradient);color:#fff;font-weight:700;padding:10px 20px;border-radius:var(--radius-sm);font-size:.875rem;box-shadow:0 4px 10px rgba(99,102,241,.25);transition:transform .15s ease,box-shadow .15s ease}.add-book-trigger-btn:hover{transform:translateY(-1px);box-shadow:0 6px 14px rgba(99,102,241,.35)}.filter-tabs{display:flex;margin-bottom:24px;background-color:#f1f5f9;padding:4px;border-radius:var(--radius-sm);grid-gap:4px;gap:4px}.filter-btn{flex:1 1;padding:10px 16px;background:transparent;color:var(--text-muted);border:none;border-radius:6px;font-weight:600;font-size:.875rem;cursor:pointer;transition:all .2s ease}.filter-btn:hover{color:var(--text-main)}.filter-btn.active{background-color:var(--surface);color:var(--primary);font-weight:700;box-shadow:var(--shadow-sm)}.loading{padding:16px;color:var(--primary);font-weight:600;text-align:center;display:flex;align-items:center;justify-content:center;grid-gap:8px;gap:8px}.spinner{width:16px;height:16px;border:2px solid var(--primary-light);border-top-color:var(--primary);border-radius:50%;animation:spin .6s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}.error{padding:12px 16px;margin:16px 0;background-color:#fef2f2;color:#991b1b;border:1px solid #fecaca;border-radius:var(--radius-sm);font-size:.875rem;font-weight:600}.books-list{margin:20px 0;display:flex;flex-direction:column;grid-gap:12px;gap:12px}.book-item{padding:16px 20px;background-color:var(--surface);border:1px solid var(--border-light);border-radius:var(--radius-md);display:flex;justify-content:space-between;align-items:center}.book-info{display:flex;flex-direction:column;grid-gap:2px;gap:2px}.book-author{font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--primary)}.book-title{font-size:1rem;font-weight:700;color:var(--text-main)}.book-badge{font-size:.75rem;font-weight:700;padding:4px 10px;border-radius:20px}.book-badge.private{background-color:#fef3c7;color:#92400e}.book-badge.public{background-color:#f1f5f9;color:var(--text-muted)}.empty-state{padding:40px 20px;text-align:center;color:var(--text-muted);background-color:#f8fafc;border:2px dashed var(--border-light);border-radius:var(--radius-md);font-weight:500}button{cursor:pointer;padding:10px 18px;border-radius:var(--radius-sm);border:none;background-color:var(--primary);color:#fff;font-weight:600;font-family:var(--font-family);font-size:.875rem;transition:all .15s ease}button:hover{background-color:var(--primary-hover)}button.secondary{background-color:#f1f5f9;color:var(--text-main);border:1px solid var(--border-light)}button.secondary:hover{background-color:#e2e8f0}button:disabled{opacity:.6;cursor:not-allowed}.modal-overlay{position:fixed;top:0;left:0;width:100vw;height:100vh;background-color:rgba(15,23,42,.6);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:1000;animation:fadeIn .2s ease-out}.modal-content{background:var(--surface);padding:32px;border-radius:var(--radius-lg);width:100%;max-width:440px;box-shadow:var(--shadow-lg);border:1px solid var(--border-light);animation:modalScale .25s cubic-bezier(.16,1,.3,1)}.modal-content h3{margin-top:0;margin-bottom:20px;font-size:1.35rem;font-weight:800;color:var(--text-main);letter-spacing:-.02em}.form-group{margin-bottom:20px;text-align:left}.form-group label{display:block;margin-bottom:8px;font-weight:600;font-size:.875rem;color:var(--text-main)}.form-group input{width:100%;padding:10px 14px;box-sizing:border-box;border:1px solid var(--border-light);border-radius:var(--radius-sm);font-family:var(--font-family);font-size:.9375rem;color:var(--text-main);transition:all .2s ease}.form-group input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(99,102,241,.2)}.modal-actions{display:flex;justify-content:flex-end;grid-gap:8px;gap:8px;margin-top:24px}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes modalScale{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}@media (max-width:640px){.header-content{flex-direction:column;align-items:center;grid-gap:12px;gap:12px;padding:12px 16px}.header-title{text-align:center;font-size:1.125rem}.header-right{width:100%;flex-direction:column;align-items:center;grid-gap:10px;gap:10px}.user-selector{justify-content:center;flex-wrap:wrap;grid-gap:6px;gap:6px;height:auto;width:100%}.user-input{width:110px}.private-books-badge{margin-top:2px}}
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