:root{--color-primary: #3b82f6;--color-primary-dark: #2563eb;--color-secondary: #10b981;--color-danger: #ef4444;--color-warning: #f59e0b;--color-info: #06b6d4;--color-gray-50: #f9fafb;--color-gray-100: #f3f4f6;--color-gray-200: #e5e7eb;--color-gray-300: #d1d5db;--color-gray-400: #9ca3af;--color-gray-500: #6b7280;--color-gray-600: #4b5563;--color-gray-700: #374151;--color-gray-800: #1f2937;--color-gray-900: #111827;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--radius-sm: .25rem;--radius-md: .375rem;--radius-lg: .5rem;--radius-xl: .75rem;--radius-full: 9999px;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1)}*{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;background-color:var(--color-gray-50);color:var(--color-gray-900);line-height:1.5}#root{min-height:100vh;display:flex;flex-direction:column}h1,h2,h3,h4,h5,h6{font-weight:600;line-height:1.25;color:var(--color-gray-900)}h1{font-size:2.25rem}h2{font-size:1.875rem}h3{font-size:1.5rem}h4{font-size:1.25rem}h5{font-size:1.125rem}h6{font-size:1rem}a{color:var(--color-primary);text-decoration:none}a:hover{color:var(--color-primary-dark);text-decoration:underline}button{cursor:pointer;font-family:inherit;font-size:.875rem;font-weight:500;padding:var(--spacing-sm) var(--spacing-md);border:none;border-radius:var(--radius-md);transition:all .2s ease;display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-xs)}button:disabled{opacity:.5;cursor:not-allowed}input,select,textarea{font-family:inherit;font-size:.875rem;padding:var(--spacing-sm) var(--spacing-md);border:1px solid var(--color-gray-300);border-radius:var(--radius-md);background-color:#fff;transition:border-color .2s ease;width:100%}input:focus,select:focus,textarea:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px #3b82f61a}.container{width:100%;max-width:1280px;margin:0 auto;padding:0 var(--spacing-md)}.loading{display:flex;align-items:center;justify-content:center;min-height:200px}.spinner{width:2rem;height:2rem;border:2px solid var(--color-gray-200);border-top-color:var(--color-primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.error-message{background-color:#fef2f2;color:var(--color-danger);padding:var(--spacing-md);border-radius:var(--radius-md);border:1px solid #fee2e2;margin-bottom:var(--spacing-md);display:flex;align-items:center;justify-content:space-between}.success-message{background-color:#f0fdf4;color:var(--color-secondary);padding:var(--spacing-md);border-radius:var(--radius-md);border:1px solid #bbf7d0;margin-bottom:var(--spacing-md)}.dashboard{max-width:1200px;margin:0 auto}.dashboard-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-xl)}.dashboard-header h2{margin:0}.refresh-stats-button{background-color:var(--color-primary);color:#fff}.refresh-stats-button:hover{background-color:var(--color-primary-dark)}.summary-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:var(--spacing-lg);margin-bottom:var(--spacing-2xl)}.summary-card{background:#fff;border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-sm);display:flex;align-items:center;gap:var(--spacing-lg);transition:transform .2s,box-shadow .2s}.summary-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.summary-card.warning{background-color:#fef3c7;border:1px solid #fbbf24}.card-icon{font-size:2.5rem;line-height:1}.card-content h3{font-size:.875rem;font-weight:500;color:var(--color-gray-600);margin:0 0 var(--spacing-xs) 0}.card-value{font-size:2rem;font-weight:700;color:var(--color-gray-900);margin:0}.quick-stats{background:#fff;border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-sm);display:flex;justify-content:space-around;margin-bottom:var(--spacing-xl)}.stat-item{text-align:center}.stat-label{display:block;font-size:.875rem;color:var(--color-gray-600);margin-bottom:var(--spacing-xs)}.stat-value{display:block;font-size:1.5rem;font-weight:700;color:var(--color-gray-900)}.dashboard-section{background:#fff;border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-sm);margin-bottom:var(--spacing-lg)}.dashboard-section h3{margin:0 0 var(--spacing-md) 0;font-size:1.125rem}.warning-section{background-color:#fef3c7;border:1px solid #fbbf24}.status-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:var(--spacing-md)}.status-item{padding:var(--spacing-md);border-radius:var(--radius-md);text-align:center}.status-item.available{background-color:#d1fae5;color:#065f46}.status-item.borrowed{background-color:#dbeafe;color:#1e40af}.status-item.reserved{background-color:#e0e7ff;color:#3730a3}.status-item.lost{background-color:#fee2e2;color:#991b1b}.status-item.damaged{background-color:#fed7aa;color:#92400e}.status-label{display:block;font-size:.875rem;margin-bottom:var(--spacing-xs)}.status-count{display:block;font-size:1.5rem;font-weight:700}.bookshelf-list{display:flex;flex-direction:column;gap:var(--spacing-sm)}.bookshelf-item{display:flex;justify-content:space-between;align-items:center;padding:var(--spacing-sm) 0;border-bottom:1px solid var(--color-gray-200)}.bookshelf-item:last-child{border-bottom:none}.bookshelf-info{display:flex;align-items:center;gap:var(--spacing-sm)}.bookshelf-color{width:16px;height:16px;border-radius:var(--radius-sm);flex-shrink:0}.bookshelf-name{font-weight:500}.bookshelf-count{color:var(--color-gray-600)}.borrowers-list{display:flex;flex-direction:column;gap:var(--spacing-sm)}.borrower-item{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-sm) 0;border-bottom:1px solid var(--color-gray-200)}.borrower-item:last-child{border-bottom:none}.borrower-rank{background-color:var(--color-gray-100);color:var(--color-gray-700);width:28px;height:28px;border-radius:var(--radius-full);display:flex;align-items:center;justify-content:center;font-weight:600;font-size:.875rem}.borrower-name{flex:1;font-weight:500}.borrower-count{color:var(--color-gray-600)}.overdue-list{display:flex;flex-direction:column;gap:var(--spacing-md)}.overdue-item{padding:var(--spacing-md);background-color:#fff;border-radius:var(--radius-md);border:1px solid #fbbf24}.overdue-info{display:flex;flex-direction:column;gap:var(--spacing-xs);margin-bottom:var(--spacing-sm)}.borrower-info{color:var(--color-gray-600);font-size:.875rem}.overdue-dates{display:flex;gap:var(--spacing-md);font-size:.875rem}.due-date{color:var(--color-danger);font-weight:500}.recent-books{display:flex;flex-direction:column;gap:var(--spacing-sm)}.recent-book{display:flex;justify-content:space-between;align-items:center;padding:var(--spacing-sm) 0;border-bottom:1px solid var(--color-gray-200)}.recent-book:last-child{border-bottom:none}.book-author{color:var(--color-gray-600);font-size:.875rem}.book-date{color:var(--color-gray-500);font-size:.875rem}.bookshelf-manager{max-width:1200px;margin:0 auto}.bookshelf-form{background:#fff;border-radius:var(--radius-lg);padding:var(--spacing-xl);box-shadow:var(--shadow-md);margin-bottom:var(--spacing-xl)}.bookshelf-form h3{margin:0 0 var(--spacing-lg) 0}.form-group input[type=text],.form-group input[type=color],.form-group textarea{width:100%}.form-group input[type=checkbox]{width:auto;margin-right:var(--spacing-sm)}.save-button:hover{background-color:var(--color-primary-dark)}.bookshelves-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:var(--spacing-lg)}.bookshelf-card{background:#fff;border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-sm);transition:transform .2s,box-shadow .2s}.bookshelf-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.bookshelf-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:var(--spacing-md)}.bookshelf-title{display:flex;align-items:center;gap:var(--spacing-sm);flex:1}.bookshelf-title h3{margin:0;font-size:1.125rem}.bookshelf-icon{font-size:1.5rem}.default-badge{background-color:var(--color-info);color:#fff;font-size:.75rem;padding:.25rem .5rem;border-radius:var(--radius-sm);font-weight:500}.bookshelf-color-indicator{width:24px;height:24px;border-radius:var(--radius-md);flex-shrink:0}.bookshelf-description{color:var(--color-gray-600);font-size:.875rem;margin-bottom:var(--spacing-md);line-height:1.5}.bookshelf-meta{display:flex;gap:var(--spacing-md);margin-bottom:var(--spacing-md);flex-wrap:wrap}.meta-item{font-size:.875rem;color:var(--color-gray-600);display:flex;align-items:center;gap:var(--spacing-xs)}.bookshelf-actions{display:flex;gap:var(--spacing-sm);padding-top:var(--spacing-md);border-top:1px solid var(--color-gray-200)}.edit-button{background-color:var(--color-gray-100);color:var(--color-gray-700);flex:1}.edit-button:hover:not(:disabled){background-color:var(--color-gray-200)}.delete-button{background-color:#fee2e2;color:var(--color-danger);flex:1}.delete-button:hover:not(:disabled){background-color:#fecaca}.empty-state{text-align:center;padding:var(--spacing-2xl);color:var(--color-gray-600)}.empty-state p{margin-bottom:var(--spacing-lg);font-size:1.125rem}@media (max-width: 768px){.bookshelves-grid,.form-grid{grid-template-columns:1fr}}.book-manager{max-width:1200px;margin:0 auto}.header-stats{display:flex;gap:var(--spacing-lg);color:var(--color-gray-600);font-size:.875rem}.add-book-form{background:#fff;border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-sm);margin-bottom:var(--spacing-xl);display:flex;gap:var(--spacing-md);align-items:center}.add-book-form input[type=text]{flex:1;max-width:300px}.add-book-form select{min-width:150px}.add-button{background-color:var(--color-secondary);color:#fff;padding:var(--spacing-sm) var(--spacing-lg);font-weight:500;white-space:nowrap}.add-button:hover:not(:disabled){background-color:#059669}.books-table-container{background:#fff;border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);overflow:hidden}.books-table{width:100%;border-collapse:collapse}.books-table thead{background-color:var(--color-gray-50)}.books-table th{text-align:left;padding:var(--spacing-md) var(--spacing-lg);font-weight:600;color:var(--color-gray-700);font-size:.875rem;border-bottom:1px solid var(--color-gray-200)}.books-table td{padding:var(--spacing-md) var(--spacing-lg);border-bottom:1px solid var(--color-gray-100)}.books-table tbody tr:hover{background-color:var(--color-gray-50)}.books-table tbody tr:last-child td{border-bottom:none}.book-info{display:flex;flex-direction:column;gap:var(--spacing-xs)}.book-info strong{font-size:1rem;color:var(--color-gray-900)}.book-author{font-size:.875rem;color:var(--color-gray-600)}.book-isbn{font-size:.75rem;color:var(--color-gray-500);font-family:var(--font-mono)}.bookshelf-select{min-width:150px;font-size:.875rem}.status-select{min-width:120px;font-size:.875rem;padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--radius-md);font-weight:500}.status-select.status-available{background-color:#d1fae5;color:#065f46;border-color:#6ee7b7}.status-select.status-borrowed{background-color:#dbeafe;color:#1e40af;border-color:#93c5fd}.status-select.status-reserved{background-color:#e0e7ff;color:#3730a3;border-color:#a5b4fc}.status-select.status-lost{background-color:#fee2e2;color:#991b1b;border-color:#fca5a5}.status-select.status-damaged{background-color:#fed7aa;color:#92400e;border-color:#fdba74}.no-books{text-align:center;padding:var(--spacing-2xl);color:var(--color-gray-500);font-style:italic}@media (max-width: 768px){.manager-header{flex-direction:column;align-items:flex-start;gap:var(--spacing-md)}.add-book-form{flex-direction:column;align-items:stretch}.add-book-form input[type=text],.add-book-form select{max-width:none;width:100%}.filters-section{flex-direction:column}.search-input,.filter-select{width:100%}.books-table{font-size:.875rem}.books-table th,.books-table td{padding:var(--spacing-sm)}.bookshelf-select,.status-select{min-width:unset;width:100%}}.lending-manager{max-width:1200px;margin:0 auto}.manager-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-xl)}.manager-header h2{margin:0}.create-button{background-color:var(--color-secondary);color:#fff;padding:var(--spacing-sm) var(--spacing-lg);font-weight:500}.create-button:hover:not(:disabled){background-color:#059669}.lending-form{background:#fff;border-radius:var(--radius-lg);padding:var(--spacing-xl);box-shadow:var(--shadow-md);margin-bottom:var(--spacing-xl)}.lending-form h3{margin:0 0 var(--spacing-lg) 0}.form-section{margin-bottom:var(--spacing-xl)}.form-section h4{margin:0 0 var(--spacing-md) 0;font-size:1rem;color:var(--color-gray-700)}.book-search{display:flex;gap:var(--spacing-md);margin-bottom:var(--spacing-md)}.book-search input{flex:1}.search-button{background-color:var(--color-primary);color:#fff;padding:var(--spacing-sm) var(--spacing-lg);font-weight:500}.search-button:hover:not(:disabled){background-color:var(--color-primary-dark)}.search-results{max-height:300px;overflow-y:auto;border:1px solid var(--color-gray-200);border-radius:var(--radius-md);background:var(--color-gray-50)}.search-result{padding:var(--spacing-md);border-bottom:1px solid var(--color-gray-200);cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:background-color .2s}.search-result:hover{background-color:var(--color-gray-100)}.search-result.selected{background-color:#dbeafe;border-color:var(--color-primary)}.search-result:last-child{border-bottom:none}.selected-mark{color:var(--color-primary);font-size:1.25rem;font-weight:700}.form-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--spacing-lg);margin-bottom:var(--spacing-lg)}.form-group{display:flex;flex-direction:column;gap:var(--spacing-xs)}.form-group label{font-weight:500;font-size:.875rem;color:var(--color-gray-700)}.form-group input,.form-group textarea{width:100%}.form-actions{display:flex;gap:var(--spacing-md);justify-content:flex-end;margin-top:var(--spacing-lg)}.save-button{background-color:var(--color-primary);color:#fff}.save-button:hover:not(:disabled){background-color:var(--color-primary-dark)}.save-button:disabled{opacity:.5;cursor:not-allowed}.cancel-button{background-color:var(--color-gray-200);color:var(--color-gray-700)}.cancel-button:hover{background-color:var(--color-gray-300)}.filters-section{background:#fff;border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-sm);margin-bottom:var(--spacing-xl);display:flex;gap:var(--spacing-md);flex-wrap:wrap}.search-input{flex:1;min-width:250px}.filter-select{min-width:150px}.lendings-table-container{background:#fff;border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);overflow:hidden}.lendings-table{width:100%;border-collapse:collapse}.lendings-table thead{background-color:var(--color-gray-50)}.lendings-table th{text-align:left;padding:var(--spacing-md) var(--spacing-lg);font-weight:600;color:var(--color-gray-700);font-size:.875rem;border-bottom:1px solid var(--color-gray-200)}.lendings-table td{padding:var(--spacing-md) var(--spacing-lg);border-bottom:1px solid var(--color-gray-100)}.lendings-table tbody tr:hover{background-color:var(--color-gray-50)}.lendings-table tbody tr:last-child td{border-bottom:none}.overdue-row{background-color:#fef3c7}.overdue-row:hover{background-color:#fde68a!important}.book-info,.borrower-info{display:flex;flex-direction:column;gap:var(--spacing-xs)}.book-info strong,.borrower-info strong{font-size:.95rem;color:var(--color-gray-900)}.book-author,.book-shelf,.borrower-email{font-size:.875rem;color:var(--color-gray-600)}.book-shelf{font-size:.75rem;color:var(--color-gray-500)}.status-badge{display:inline-block;padding:.25rem .75rem;border-radius:var(--radius-full);font-size:.75rem;font-weight:600;text-transform:uppercase}.status-badge.active{background-color:#dbeafe;color:#1e40af}.status-badge.overdue{background-color:#fee2e2;color:#991b1b}.status-badge.returned{background-color:#d1fae5;color:#065f46}.overdue-date{color:var(--color-danger);font-weight:600}.action-buttons{display:flex;gap:var(--spacing-sm)}.return-button{background-color:#d1fae5;color:#065f46;padding:var(--spacing-xs) var(--spacing-sm);font-size:1rem;border-radius:var(--radius-md);transition:all .2s}.return-button:hover{background-color:#a7f3d0;transform:scale(1.05)}.extend-button{background-color:#dbeafe;color:#1e40af;padding:var(--spacing-xs) var(--spacing-sm);font-size:1rem;border-radius:var(--radius-md);transition:all .2s}.extend-button:hover{background-color:#bfdbfe;transform:scale(1.05)}.delete-button{background-color:#fee2e2;color:var(--color-danger);padding:var(--spacing-xs) var(--spacing-sm);font-size:1rem;border-radius:var(--radius-md);transition:all .2s}.delete-button:hover{background-color:#fecaca;transform:scale(1.05)}.no-lendings{text-align:center;padding:var(--spacing-2xl);color:var(--color-gray-500);font-style:italic}@media (max-width: 768px){.manager-header{flex-direction:column;align-items:flex-start;gap:var(--spacing-md)}.book-search{flex-direction:column}.form-grid{grid-template-columns:1fr}.filters-section{flex-direction:column}.search-input,.filter-select{width:100%}.lendings-table{font-size:.875rem}.lendings-table th,.lendings-table td{padding:var(--spacing-sm)}.action-buttons{flex-direction:column;gap:var(--spacing-xs)}}.admin-panel{min-height:100vh;background-color:var(--color-gray-50)}.admin-header{background-color:#fff;border-bottom:1px solid var(--color-gray-200);padding:var(--spacing-lg) var(--spacing-xl);display:flex;justify-content:space-between;align-items:center}.admin-header h1{font-size:1.5rem;font-weight:700;color:var(--color-gray-900);margin:0}.header-actions{display:flex;gap:var(--spacing-md);align-items:center}.refresh-button{background-color:var(--color-primary);color:#fff;padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-md);font-weight:500;transition:background-color .2s}.refresh-button:hover:not(:disabled){background-color:var(--color-primary-dark)}.refresh-button:disabled{background-color:var(--color-gray-400);cursor:not-allowed}.admin-nav{background-color:#fff;border-bottom:1px solid var(--color-gray-200);padding:0 var(--spacing-xl)}.tab-list{display:flex;gap:var(--spacing-lg)}.tab-button{background:none;border:none;padding:var(--spacing-md) var(--spacing-xs);display:flex;align-items:center;gap:var(--spacing-sm);color:var(--color-gray-600);font-weight:500;border-bottom:2px solid transparent;transition:all .2s;position:relative}.tab-button:hover{color:var(--color-gray-900)}.tab-button.active{color:var(--color-primary);border-bottom-color:var(--color-primary)}.tab-icon{font-size:1rem}.tab-badge{background-color:var(--color-danger);color:#fff;font-size:.75rem;font-weight:600;padding:.125rem .375rem;border-radius:var(--radius-full);min-width:1.25rem;text-align:center}.tab-button.active .tab-badge{background-color:var(--color-primary)}.admin-content{padding:var(--spacing-xl);max-width:1400px;margin:0 auto}.loading{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:400px;gap:var(--spacing-md);color:var(--color-gray-600)}.error-message{margin:var(--spacing-md) var(--spacing-xl);background-color:#fef2f2;color:var(--color-danger);padding:var(--spacing-md);border-radius:var(--radius-md);border:1px solid #fee2e2;display:flex;align-items:center;justify-content:space-between}.error-message button{background:none;color:var(--color-danger);padding:var(--spacing-xs);font-size:1.25rem;line-height:1}.error-message button:hover{opacity:.7}@media (max-width: 768px){.admin-header{padding:var(--spacing-md)}.admin-header h1{font-size:1.25rem}.tab-list{gap:var(--spacing-sm);overflow-x:auto;-webkit-overflow-scrolling:touch}.tab-button{flex-shrink:0;padding:var(--spacing-sm) var(--spacing-xs)}.tab-label{display:none}.admin-content{padding:var(--spacing-md)}}