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768px){.username{display:inline}}.admin-badge{background-color:var(--warning-color);color:#fff;padding:2px var(--spacing-sm);border-radius:var(--radius-full);font-size:var(--font-size-xs);font-weight:600}.btn-logout{background-color:var(--danger-color);color:#fff;padding:var(--spacing-sm) var(--spacing-md);border:none;border-radius:var(--radius-lg);cursor:pointer;font-size:var(--font-size-sm);font-weight:500;transition:all var(--transition-fast)}.btn-logout:hover{background-color:var(--danger-dark);transform:translateY(-2px)}@media (max-width: 768px){.header-container{padding:var(--spacing-md)}.username{display:none}}.sidebar{position:fixed;left:0;top:60px;height:calc(100vh - 60px);width:250px;background-color:var(--surface-color);border-right:1px solid var(--border-color);overflow-y:auto;transition:transform var(--transition-base);z-index:99}.sidebar.closed{transform:translate(-100%)}.sidebar-toggle{display:none;position:fixed;top:70px;left:var(--spacing-md);z-index:98;background-color:var(--primary-color);color:#fff;border:none;padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-lg);cursor:pointer;font-size:var(--font-size-lg);transition:all var(--transition-fast)}.sidebar-toggle:hover{background-color:var(--primary-dark)}@media (max-width: 768px){.sidebar-toggle{display:block}.sidebar{width:200px}}.sidebar-nav{display:flex;flex-direction:column;padding:var(--spacing-lg) 0}.nav-item{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md) var(--spacing-lg);color:var(--text-color);text-decoration:none;transition:all var(--transition-fast);border-left:3px solid 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768px){.toast-container{top:auto;bottom:var(--spacing-lg);left:var(--spacing-md);right:var(--spacing-md);max-width:100%}.toast{padding:var(--spacing-md)}}.layout{display:flex;flex-direction:column;min-height:100vh;background-color:var(--background-color)}.layout-container{display:flex;flex:1}.layout-content{flex:1;margin-left:250px;padding:var(--spacing-lg);overflow-y:auto;transition:margin-left var(--transition-base)}@media (max-width: 768px){.layout-content{margin-left:0;padding:var(--spacing-md)}}.layout-content>div{max-width:1400px;margin:0 auto;width:100%}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background-color:#00000080;display:flex;align-items:center;justify-content:center;z-index:var(--z-modal);animation:fadeIn var(--transition-fast)}.modal{background-color:var(--surface-color);border-radius:var(--radius-xl);box-shadow:var(--shadow-xl);max-height:90vh;overflow-y:auto;animation:slideUp var(--transition-base)}@keyframes 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768px){.modal-small,.modal-medium,.modal-large{width:95%;max-width:100%}.modal-header,.modal-body{padding:var(--spacing-md)}}.confirm-message{margin-bottom:var(--spacing-lg);color:var(--text-color);font-size:var(--font-size-base)}.confirm-buttons{display:flex;gap:var(--spacing-md);justify-content:flex-end}.confirm-buttons .btn{flex:1}@media (max-width: 768px){.confirm-buttons{flex-direction:column}}.book-card{display:grid;grid-template-columns:auto 1fr auto;gap:var(--spacing-lg);align-items:start;min-height:200px}.book-card.borrowed{border-left:4px solid var(--warning-color)}.book-cover{width:120px;height:160px;border-radius:var(--radius-lg);overflow:hidden;background-color:var(--background-color)}.book-cover 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.btn{flex:1;font-size:var(--font-size-xs);padding:var(--spacing-xs)}}.book-cover{width:120px;height:160px;border-radius:var(--radius-lg);overflow:hidden;background-color:var(--background-color);flex-shrink:0;display:flex;align-items:center;justify-content:center}.cover-image{width:100%;height:100%;object-fit:cover;display:block}.cover-placeholder{width:100%;height:100%;object-fit:contain;padding:8px;background:linear-gradient(135deg,#e5e7eb,#d1d5db)}@media (max-width: 480px){.book-cover{width:80px;height:110px}}@media (min-width: 768px) and (max-width: 1024px){.book-cover{width:100px;height:140px}}@media (min-width: 1400px){.book-cover{width:140px;height:190px}}.books-container.list .book-cover{width:80px;height:110px}@media (max-width: 768px){.books-container.list .book-cover{width:70px;height:100px}}.page{width:100%;max-width:1400px;margin:0 auto;animation:fadeIn .3s ease-in-out}@keyframes 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.btn{width:100%}.stats-bar{flex-direction:column;gap:var(--spacing-md)}.quick-stats{grid-template-columns:1fr}.home-header,.home-section,.login-card{padding:var(--spacing-lg)}}.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#3b82f6,#60a5fa);padding:var(--spacing-lg)}.login-container{width:100%;max-width:400px}.login-card{background-color:var(--surface-color);border-radius:var(--radius-xl);padding:var(--spacing-2xl);box-shadow:0 20px 60px #0000004d;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.login-header{text-align:center;margin-bottom:var(--spacing-2xl)}.login-icon{font-size:3rem;display:block;margin-bottom:var(--spacing-md);animation:bounce 2s infinite}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.login-header 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var(--spacing-md);background:none;border:none;text-align:left;color:var(--text-color);cursor:pointer;transition:all var(--transition-fast);font-size:var(--font-size-sm)}.dropdown-item:hover:not(:disabled){background-color:var(--background-color);color:var(--primary-color)}.dropdown-item:disabled{opacity:.5;cursor:not-allowed}.tags-selected{display:flex;flex-wrap:wrap;gap:var(--spacing-sm);margin-top:var(--spacing-sm)}.tag-badge{display:inline-flex;align-items:center;gap:var(--spacing-sm);background-color:var(--primary-color);color:#fff;padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--radius-full);font-size:var(--font-size-xs);font-weight:500}.tag-remove{background:none;border:none;color:#fff;cursor:pointer;font-size:var(--font-size-base);padding:0;margin:0;transition:opacity var(--transition-fast)}.tag-remove:hover{opacity:.8}.isbn-input-group{display:flex;gap:var(--spacing-sm)}.isbn-input-group .form-input{flex:1}.isbn-input-group .btn{white-space:nowrap}@media 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var(--warning-color);border-radius:var(--radius-md)}.detail-actions{display:flex;flex-wrap:wrap;gap:var(--spacing-md);padding-top:var(--spacing-lg);border-top:1px solid var(--border-color)}.detail-actions .btn{flex:1;min-width:150px}@media (max-width: 768px){.book-detail-container{grid-template-columns:1fr}.detail-cover{width:100%;height:auto;aspect-ratio:3 / 4;max-width:300px;margin:0 auto}.detail-actions{flex-direction:column}.detail-actions .btn{width:100%}.book-detail{padding:var(--spacing-md)}}#root{width:100%;height:100%}.app{width:100%;min-height:100vh}.loading-page{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;background-color:var(--background-color);gap:var(--spacing-lg)}.loading-page .spinner-ring{width:60px;height:60px}.loading-page p{font-size:var(--font-size-base);color:var(--text-light);margin-bottom:0}*{transition:background-color var(--transition-base),color var(--transition-base)}html{overflow-y:scroll}@media print{body{background-color:#fff}.header,.sidebar,.sidebar-toggle,.page-header .btn,.card-actions,.detail-actions{display:none!important}}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background-color:var(--background-color);color:var(--text-color);line-height:1.6;font-size:var(--font-size-base);transition:background-color var(--transition-base)}h1,h2,h3,h4,h5,h6{font-weight:600;line-height:1.2;margin-bottom:var(--spacing-md)}h1{font-size:var(--font-size-3xl)}h2{font-size:var(--font-size-2xl)}h3{font-size:var(--font-size-xl)}p{margin-bottom:var(--spacing-md);color:var(--text-light)}a{color:var(--primary-color);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--primary-dark)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);font-size:var(--font-size-sm);font-weight:500;border:none;border-radius:var(--radius-lg);cursor:pointer;transition:all var(--transition-fast);white-space:nowrap;-webkit-user-select:none;user-select:none}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-primary{background-color:var(--primary-color);color:#fff}.btn-primary:hover:not(:disabled){background-color:var(--primary-dark);transform:translateY(-2px);box-shadow:var(--shadow-md)}.btn-secondary{background-color:var(--secondary-color);color:#fff}.btn-secondary:hover:not(:disabled){background-color:var(--secondary-dark)}.btn-success{background-color:var(--success-color);color:#fff}.btn-success:hover:not(:disabled){background-color:var(--success-dark)}.btn-danger{background-color:var(--danger-color);color:#fff}.btn-danger:hover:not(:disabled){background-color:var(--danger-dark)}.btn-warning{background-color:var(--warning-color);color:#fff}.btn-warning:hover:not(:disabled){background-color:var(--warning-dark)}.btn-block{width:100%}.btn-sm{padding:var(--spacing-xs) var(--spacing-sm);font-size:var(--font-size-xs)}.btn-large{padding:var(--spacing-md) var(--spacing-lg);font-size:var(--font-size-base)}.form-input,.form-select{width:100%;padding:var(--spacing-sm) var(--spacing-md);font-size:var(--font-size-base);border:1px solid var(--border-color);border-radius:var(--radius-lg);background-color:var(--surface-color);color:var(--text-color);transition:all var(--transition-fast);font-family:inherit}.form-input:focus,.form-select:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #3b82f61a}.form-input.error{border-color:var(--danger-color);background-color:#ef44440d}.form-input.error:focus{box-shadow:0 0 0 3px #ef44441a}.form-input::placeholder{color:var(--text-light)}.form-input-large{padding:var(--spacing-md) var(--spacing-lg);font-size:var(--font-size-lg)}ul,ol{list-style-position:inside;margin-bottom:var(--spacing-lg)}li{margin-bottom:var(--spacing-sm)}.loading-page{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;gap:var(--spacing-lg)}.loading-container{display:flex;align-items:center;justify-content:center;min-height:400px;padding:var(--spacing-2xl)}.empty-state,.error-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--spacing-3xl) var(--spacing-lg);text-align:center}.empty-state .empty-icon,.error-state .error-icon{font-size:4rem;margin-bottom:var(--spacing-lg)}.empty-state h3,.error-state h2{margin-bottom:var(--spacing-md)}.empty-state p,.error-state p{color:var(--text-light);margin-bottom:var(--spacing-lg)}@media (max-width: 768px){h1{font-size:var(--font-size-2xl)}h2{font-size:var(--font-size-xl)}h3{font-size:var(--font-size-lg)}.btn{padding:var(--spacing-sm) var(--spacing-md);font-size:var(--font-size-xs)}.form-input,.form-select{padding:var(--spacing-sm) var(--spacing-md)}}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--background-color)}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--secondary-light)}::selection{background-color:var(--primary-color);color:#fff}:root{--primary-color: #3b82f6;--primary-dark: #2563eb;--primary-light: #60a5fa;--success-color: #10b981;--success-dark: #059669;--success-light: #34d399;--danger-color: #ef4444;--danger-dark: #dc2626;--danger-light: #f87171;--warning-color: #f59e0b;--warning-dark: #d97706;--warning-light: #fbbf24;--secondary-color: #6b7280;--secondary-dark: #4b5563;--secondary-light: #9ca3af;--background-color: #f9fafb;--surface-color: #ffffff;--border-color: #e5e7eb;--text-color: #1f2937;--text-light: #6b7280;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--font-size-xs: .75rem;--font-size-sm: .875rem;--font-size-base: 1rem;--font-size-lg: 1.125rem;--font-size-xl: 1.25rem;--font-size-2xl: 1.5rem;--font-size-3xl: 1.875rem;--font-size-4xl: 2.25rem;--radius-sm: .25rem;--radius-md: .375rem;--radius-lg: .5rem;--radius-xl: .75rem;--radius-full: 9999px;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1);--transition-fast: .15s ease-in-out;--transition-base: .3s ease-in-out;--transition-slow: .5s ease-in-out;--z-dropdown: 1000;--z-modal: 1050;--z-tooltip: 1100}@media (prefers-color-scheme: dark){:root{--background-color: #111827;--surface-color: #1f2937;--border-color: #374151;--text-color: #f3f4f6;--text-light: #d1d5db}}