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var(--transition);display:flex;align-items:center;gap:4px}.edit-btn{background:#3b82f6;color:#fff}.edit-btn:hover{background:#2563eb!important;color:#fff!important;transform:none!important;box-shadow:none!important}.delete-btn{background:#ef4444;color:#fff}.delete-btn:hover{background:#dc2626!important;color:#fff!important;transform:none!important;box-shadow:none!important}.edit-form{display:flex;align-items:center;gap:var(--spacing-sm);width:100%;padding:var(--spacing-md);background:var(--bg-tertiary);border-left:4px solid var(--primary-color);animation:highlight .3s ease-out}.edit-form input{flex:1;padding:var(--spacing-sm);border:2px solid var(--primary-color);border-radius:var(--border-radius);font-size:var(--font-size-base)}.edit-form input:focus{outline:none;box-shadow:0 0 0 2px #5e6ad233}.empty-state{text-align:center;padding:var(--spacing-xl);color:var(--text-secondary);background:var(--bg-tertiary);border-radius:var(--border-radius);margin-top:var(--spacing-md)}.empty-state-icon{font-size:3rem;margin-bottom:var(--spacing-md);opacity:.5}.empty-state p{margin:0;font-size:var(--font-size-base)}@keyframes slideIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes highlight{0%{background-color:#5e6ad21a}to{background-color:var(--bg-tertiary)}}@media(max-width:768px){.category-grid{grid-template-columns:1fr}.category-form,.category-list{grid-column:1}.category-content{padding:var(--spacing-lg)}.category-item{flex-direction:column;align-items:flex-start;gap:var(--spacing-sm)}.actions{align-self:flex-end}.edit-form{flex-direction:column;align-items:stretch}.edit-form input{width:100%}}@media(max-width:480px){.category-content{padding:var(--spacing-md)}.category-item{padding:var(--spacing-sm)}.action-btn{padding:var(--spacing-xs) var(--spacing-sm);font-size:var(--font-size-xs)}}:root{--bg-tertiary: #f8fafc;--text-primary: #1a202c;--text-secondary: #4a5568;--border-color: #e2e8f0;--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1)}.stats-page{padding:var(--spacing-xl) 0}.stats-content{max-width:1200px;margin:0 auto;padding:2rem;width:100%;display:flex;flex-direction:column;gap:2rem}.stats-overview{margin-bottom:var(--spacing-xl)}.stats-overview h3{margin-bottom:var(--spacing-lg);color:var(--text-primary);font-size:var(--font-size-lg);font-weight:600}.stats-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:var(--spacing-lg)}.stat-card{position:relative;background:var(--bg-secondary);padding:var(--spacing-lg);border-radius:var(--border-radius-lg);box-shadow:var(--shadow-md);transition:transform var(--transition),box-shadow var(--transition);overflow:hidden}.stat-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}.stat-card h4{margin:0 0 var(--spacing-sm) 0;color:var(--text-secondary);font-size:var(--font-size-sm);font-weight:500;text-transform:uppercase;letter-spacing:.5px}.stat-number{margin:0;font-size:2.5rem;font-weight:700;font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif}.stat-icon{font-size:2rem;margin-bottom:var(--spacing-sm)}.stat-bg-icon{position:absolute;bottom:10px;right:10px;font-size:3rem;opacity:.1;z-index:0}.total-borrows{background:linear-gradient(135deg,#60a5fa,#3b82f6);color:#fff}.total-returns{background:linear-gradient(135deg,#34d399,#10b981);color:#fff}.current-borrows{background:linear-gradient(135deg,#fbbf24,#f59e0b);color:#fff}.avg-days{background:linear-gradient(135deg,#a78bfa,#8b5cf6);color:#fff}.total-borrows h4,.total-returns h4,.current-borrows h4,.avg-days h4{color:#ffffffe6}.stats-grid{display:grid;grid-template-columns:1fr;gap:var(--spacing-lg);margin-bottom:var(--spacing-xl)}.stats-grid-item.popular-books-stats{min-height:400px}.monthly-stats{background:var(--bg-secondary);padding:var(--spacing-lg);border-radius:var(--border-radius-lg);box-shadow:var(--shadow-md)}.monthly-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-lg)}.monthly-header h3{margin:0;color:var(--text-primary);font-size:var(--font-size-lg);font-weight:600}.year-select{padding:var(--spacing-sm) var(--spacing-md);border:1px solid var(--border-color);border-radius:var(--border-radius);background:#fff;color:var(--text-primary);font-size:var(--font-size-sm);cursor:pointer;transition:border-color var(--transition);box-shadow:var(--shadow-sm)}.year-select:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 2px #5e6ad233}.monthly-chart{position:relative;display:flex;align-items:flex-end;height:300px;padding:var(--spacing-md) 0;background-image:linear-gradient(to top,transparent 98%,var(--border-color) 98%);background-size:100% 20%;background-position:0 0}.month-bar{flex:1;display:flex;flex-direction:column;align-items:center;margin:0 5px;position:relative}.bar{width:40px;background:linear-gradient(to top,#3b82f6,#60a5fa);border-top-left-radius:4px;border-top-right-radius:4px;transition:height 1s ease-out,background-color .3s ease;position:relative;margin-bottom:var(--spacing-sm);min-height:5px;width:100%;max-width:40px}.bar:hover{background:linear-gradient(to top,#2563eb,#3b82f6);transform:scaleY(1.05)}.bar:hover:after{content:attr(data-count);position:absolute;top:-25px;left:50%;transform:translate(-50%);background:var(--text-primary);color:#fff;padding:2px 8px;border-radius:4px;font-size:var(--font-size-xs);white-space:nowrap}.month-label{font-size:var(--font-size-xs);color:var(--text-secondary);margin-bottom:4px}.count-label{font-size:var(--font-size-sm);font-weight:600;color:var(--text-primary)}.monthly-chart-container{overflow-x:auto;margin:0 -var(--spacing-lg);padding:0 var(--spacing-lg)}.monthly-chart-new{display:flex;align-items:flex-end;height:300px;padding:var(--spacing-lg);background:var(--bg-tertiary);border-radius:var(--border-radius);position:relative;overflow:hidden;min-width:600px}.monthly-chart-container::-webkit-scrollbar{height:6px}.monthly-chart-container::-webkit-scrollbar-track{background:var(--bg-tertiary);border-radius:3px}.monthly-chart-container::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:3px}.monthly-chart-container::-webkit-scrollbar-thumb:hover{background:var(--text-light)}.monthly-chart-new:before{content:"";position:absolute;inset:0;background-image:linear-gradient(to top,transparent 95%,var(--border-color) 95%);background-size:100% 25%;pointer-events:none}.month-bar-new{flex:1;display:flex;flex-direction:column;align-items:center;margin:0 8px;position:relative;min-width:60px}.month-label-new{font-size:var(--font-size-sm);color:var(--text-secondary);margin-top:var(--spacing-sm);font-weight:500;text-align:center;white-space:nowrap;width:100%;height:24px;display:flex;align-items:center;justify-content:center}.bar-container{display:flex;align-items:flex-end;height:220px;width:100%;max-width:60px}.bar-new{width:100%;background:linear-gradient(to top,#3b82f6,#60a5fa);border-top-left-radius:8px;border-top-right-radius:8px;transition:all .5s ease;position:relative;box-shadow:0 2px 8px #3b82f64d}.bar-new:hover{background:linear-gradient(to top,#2563eb,#3b82f6);transform:scaleY(1.05);box-shadow:0 4px 12px #3b82f666}.bar-value{position:absolute;top:-25px;left:50%;transform:translate(-50%);color:var(--text-primary);font-size:12px;text-shadow:none;font-weight:600}.month-label-new{font-size:var(--font-size-sm);color:var(--text-secondary);margin-top:var(--spacing-sm);font-weight:500}.popular-books-stats{background:var(--bg-secondary);padding:var(--spacing-lg);border-radius:var(--border-radius-lg);box-shadow:var(--shadow-md)}.popular-books-stats h3{margin:0 0 var(--spacing-lg) 0;color:var(--text-primary);font-size:var(--font-size-lg);font-weight:600}.no-data{text-align:center;color:var(--text-secondary);padding:var(--spacing-xl)}.stats-table{width:100%;border-collapse:collapse}.table-header{display:grid;grid-template-columns:80px 1fr 1fr 120px;padding:var(--spacing-md);background:var(--bg-tertiary);border-radius:var(--border-radius) var(--border-radius) 0 0;font-weight:600;color:var(--text-primary);font-size:var(--font-size-sm)}.table-row{display:grid;grid-template-columns:80px 1fr 1fr 120px;padding:var(--spacing-md);border-bottom:1px solid var(--border-color);transition:background-color var(--transition)}.table-row:hover{background-color:var(--bg-tertiary)}.table-row:last-child{border-bottom:none;border-radius:0 0 var(--border-radius) var(--border-radius)}.table-cell{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;align-self:center}.table-cell:first-child,.table-cell:last-child{display:flex}.rank-badge{width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:var(--font-size-sm);background:var(--bg-tertiary);color:var(--text-secondary)}.rank-badge.rank-1{background:linear-gradient(135deg,gold,#ffed4e);color:#8b6914}.rank-badge.rank-2{background:linear-gradient(135deg,silver,#e8e8e8);color:#666}.rank-badge.rank-3{background:linear-gradient(135deg,#cd7f32,#e6a260);color:#8b4513}.borrow-count-container{display:flex;flex-direction:column;width:100%}.borrow-count{font-weight:600;margin-bottom:4px}.borrow-bar{height:6px;background:var(--bg-tertiary);border-radius:3px;overflow:hidden}.borrow-bar-fill{height:100%;background:linear-gradient(90deg,#3b82f6,#60a5fa);border-radius:3px;transition:width .5s ease;box-shadow:0 1px 3px #3b82f64d;animation:slideRight 1s ease-out}@keyframes slideRight{0%{width:0}}.skeleton{background:linear-gradient(90deg,#f0f0f0 25%,#e0e0e0,#f0f0f0 75%);background-size:200% 100%;animation:loading 1.5s infinite}.skeleton-icon{width:40px;height:40px;border-radius:50%;margin-bottom:var(--spacing-sm)}.skeleton-text{width:60%;height:16px;border-radius:4px;margin-bottom:var(--spacing-sm)}.skeleton-number{width:80%;height:40px;border-radius:4px}.skeleton-selector{width:120px;height:36px;border-radius:4px}.skeleton-label{width:30px;height:12px;border-radius:2px;margin-bottom:4px}.skeleton-label.small{width:20px;height:10px}.skeleton-table{width:100%}.skeleton-row{display:grid;grid-template-columns:80px 1fr 1fr 120px;padding:var(--spacing-md);align-items:center;border-bottom:1px solid var(--border-color)}.skeleton-cell{height:20px;border-radius:4px}.skeleton-cell.rank{width:32px;border-radius:50%}.skeleton-cell.title{width:80%}.skeleton-cell.author{width:60%}.skeleton-cell.count{width:40%}@keyframes loading{0%{background-position:200% 0}to{background-position:-200% 0}}.loading{display:flex;justify-content:center;align-items:center;min-height:400px;font-size:var(--font-size-lg);color:var(--text-secondary)}@media(max-width:768px){.stats-page{padding:var(--spacing-lg)}.stats-cards{grid-template-columns:1fr}.monthly-chart{height:200px}.bar{width:30px}.table-header,.table-row{grid-template-columns:60px 1fr 1fr 100px}.rank-badge{width:24px;height:24px;font-size:var(--font-size-xs)}}@media(max-width:480px){.monthly-header{flex-direction:column;align-items:flex-start;gap:var(--spacing-sm)}.monthly-chart{height:150px}.bar{width:20px}.month-label{font-size:10px}.count-label{font-size:var(--font-size-xs)}.table-header,.table-row{grid-template-columns:50px 1fr 1fr 80px;padding:var(--spacing-sm)}}.logs-page{padding:2rem;max-width:1200px;margin:0 auto;min-height:100vh;background-color:var(--bg-primary, #f8fafc);color:var(--text-primary, #1a202c)}.logs-page h2{margin-bottom:1.5rem;color:var(--text-primary, #1a202c);font-size:1.8rem;font-weight:600}.logs-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem;flex-wrap:wrap;gap:1rem;padding:1rem;background-color:var(--bg-secondary, #ffffff);border-radius:8px;box-shadow:0 2px 4px #0000001a}.filters{display:flex;gap:1rem;align-items:center;flex-wrap:wrap}.filter-group{display:flex;align-items:center;gap:.5rem}.filter-group label{font-size:.9rem;font-weight:500;color:var(--text-secondary, #4a5568)}.filter-group select{padding:.5rem 1rem;border:1px solid var(--border-color, #e2e8f0);border-radius:6px;background-color:var(--bg-secondary, #ffffff);color:var(--text-primary, #1a202c);font-size:.9rem;cursor:pointer;transition:all .2s ease}.filter-group select:hover{border-color:var(--primary-color, #3b82f6);box-shadow:0 0 0 3px #3b82f61a}.btn-danger{padding:.6rem 1.2rem;background-color:#ef4444;color:#fff;border:none;border-radius:6px;font-size:.9rem;font-weight:500;cursor:pointer;transition:background-color .2s ease}.btn-danger:hover:not(:disabled){background-color:#dc2626;color:#fff!important}.btn-danger:disabled{background-color:#fca5a5;cursor:not-allowed}.logs-list{background-color:var(--bg-secondary, #ffffff);border-radius:8px;box-shadow:0 2px 4px #0000001a;overflow:hidden;margin-bottom:1.5rem}.logs-table{width:100%;border-collapse:collapse;font-size:.9rem}.logs-table thead{position:sticky;top:0;background-color:var(--bg-tertiary, #f1f5f9);z-index:10}.logs-table th{padding:1rem;text-align:left;font-weight:600;color:var(--text-secondary, #4a5568);border-bottom:2px solid var(--border-color, #e2e8f0)}.logs-table tbody tr{border-bottom:1px solid var(--border-color, #e2e8f0);transition:background-color .2s ease}.logs-table tbody tr:nth-child(2n){background-color:var(--bg-tertiary, #f8fafc)}.logs-table tbody tr:hover{background-color:#3b82f60d}.logs-table td{padding:.75rem 1rem;vertical-align:top;line-height:1.4}.logs-table td:first-child,.logs-table td:last-child{font-family:Monaco,Consolas,Source Code Pro,monospace}.log-message{max-width:100%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;cursor:pointer;transition:all .2s ease}.log-message.expanded{white-space:normal;word-wrap:break-word}.log-level{display:inline-block;padding:.25rem .75rem;border-radius:9999px;font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em}.log-level.info{background-color:#dbeafe;color:#1e40af}.log-level.warning{background-color:#fef3c7;color:#92400e}.log-level.error{background-color:#fee2e2;color:#b91c1c}.log-module{display:inline-block;padding:.25rem .75rem;border-radius:9999px;font-size:.75rem;font-weight:600;background-color:var(--bg-tertiary, #f1f5f9);color:var(--text-secondary, #4a5568)}.logs-list p{padding:3rem;text-align:center;color:var(--text-secondary, #4a5568);font-size:1rem}.pagination{display:flex;justify-content:center;align-items:center;gap:1rem;padding:1rem;background-color:var(--bg-secondary, #ffffff);border-radius:8px;box-shadow:0 2px 4px #0000001a}.pagination button{padding:.5rem 1rem;border:1px solid var(--border-color, #e2e8f0);border-radius:6px;background-color:var(--bg-secondary, #ffffff);color:var(--text-primary, #1a202c);font-size:.9rem;cursor:pointer;transition:all .2s ease}.pagination button:hover:not(:disabled){background-color:var(--primary-color, #3b82f6);color:#fff;border-color:var(--primary-color, #3b82f6)}.pagination button:disabled{opacity:.5;cursor:not-allowed}.pagination span{font-size:.9rem;color:var(--text-secondary, #4a5568);min-width:150px;text-align:center}.modal-overlay{position:fixed;inset:0;background-color:#00000080;display:flex;justify-content:center;align-items:center;z-index:1000}.modal{background-color:var(--bg-secondary, #ffffff);border-radius:8px;padding:2rem;width:90%;max-width:500px;box-shadow:0 10px 25px #0003}.modal h3{margin-bottom:1.5rem;color:var(--text-primary, #1a202c);font-size:1.25rem;font-weight:600}.modal-buttons{display:flex;gap:1rem;justify-content:flex-end;margin-top:2rem}.modal-btn{padding:.6rem 1.2rem;border:1px solid var(--border-color, #e2e8f0);border-radius:6px;font-size:.9rem;font-weight:500;cursor:pointer;transition:all .2s ease}.modal-btn.cancel{background-color:var(--bg-secondary, #ffffff);color:var(--text-primary, #1a202c)}.modal-btn.confirm{background-color:#ef4444;color:#fff;border-color:#ef4444}.modal-btn:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 2px 4px #0000001a}.modal-btn:disabled{opacity:.5;cursor:not-allowed}.preset-options{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:1rem;margin-bottom:1.5rem}.preset-option{padding:1rem;border:2px solid var(--border-color, #e2e8f0);border-radius:8px;text-align:center;cursor:pointer;transition:all .2s ease;background-color:var(--bg-secondary, #ffffff);color:var(--text-primary, #1a202c)}.preset-option:hover{border-color:var(--primary-color, #3b82f6);background-color:#3b82f60d}.preset-option.selected{border-color:var(--primary-color, #3b82f6);background-color:#3b82f61a}.preset-option h4{margin-bottom:.25rem;font-size:.9rem;font-weight:600}.preset-option p{font-size:.8rem;color:var(--text-secondary, #4a5568);margin:0}.loading{display:flex;justify-content:center;align-items:center;height:50vh;font-size:1.2rem;color:var(--text-secondary, #4a5568)}@media(max-width:768px){.logs-page{padding:1rem}.logs-header,.filters,.filter-group{flex-direction:column;align-items:stretch}.filter-group label{margin-bottom:.25rem}.logs-table th:nth-child(3),.logs-table td:nth-child(3){display:none}.logs-table td:first-child{font-size:.8rem}.pagination{flex-wrap:wrap}.pagination span{order:-1;width:100%}}.logs-list{max-height:600px;overflow-y:auto}.logs-list::-webkit-scrollbar{width:8px}.logs-list::-webkit-scrollbar-track{background:var(--bg-tertiary, #f1f5f9);border-radius:4px}.logs-list::-webkit-scrollbar-thumb{background:var(--border-color, #e2e8f0);border-radius:4px}.logs-list::-webkit-scrollbar-thumb:hover{background:var(--text-secondary, #4a5568)}.reservations-page{padding:2rem}.reservations-page h2{margin-bottom:1.5rem;color:var(--text-primary);font-size:1.5rem;font-weight:600}.reservations-page table{width:100%;border-collapse:collapse;margin-top:1rem;box-shadow:0 2px 4px #0000001a;border-radius:8px;overflow:hidden}.reservations-page th{background-color:var(--bg-secondary);color:var(--text-primary);padding:1rem;text-align:left;font-weight:600;border-bottom:2px solid var(--border-color)}.reservations-page td{padding:1rem;border-bottom:1px solid var(--border-color)}.reservations-page tr:last-child td{border-bottom:none}.reservations-page tr:hover{background-color:var(--bg-tertiary);transition:background-color .2s ease}.status-active{color:var(--success-color);font-weight:500}.status-inactive{color:var(--text-secondary)}.empty-state,.loading{text-align:center;padding:3rem 0;color:var(--text-secondary)}.error-message{text-align:center;padding:2rem;background-color:var(--error-bg);color:var(--error-color);border-radius:8px;margin-bottom:1rem}@media(max-width:768px){.reservations-page{padding:1rem}.reservations-page table{font-size:.9rem}.reservations-page th,.reservations-page td{padding:.75rem}}@media(max-width:480px){.reservations-page table{font-size:.8rem}.reservations-page th,.reservations-page td{padding:.5rem}}.book-details-page{padding:2rem;max-width:1200px;margin:0 auto}.back-button{background:none;border:none;color:var(--primary-color);font-size:1rem;cursor:pointer;margin-bottom:1.5rem;display:flex;align-items:center;gap:.5rem;padding:.5rem 0;transition:color .2s ease}.back-button:hover{color:var(--primary-hover)}.book-details-container{display:grid;grid-template-columns:300px 1fr;gap:2rem;align-items:start}.book-cover-section{display:flex;flex-direction:column;gap:1rem}.book-cover{width:300px;height:450px;border-radius:8px;overflow:hidden;box-shadow:0 4px 8px #0000001a;background-color:var(--bg-tertiary);display:flex;align-items:center;justify-content:center}.book-cover img{width:100%;height:100%;object-fit:cover}.placeholder-cover{width:100%;height:100%;background-color:var(--primary-color);color:#fff;display:flex;align-items:center;justify-content:center;font-size:6rem;font-weight:700}.book-status{display:flex;flex-direction:column;gap:.5rem}.status-badge{padding:.5rem 1rem;border-radius:20px;font-size:.9rem;font-weight:500;text-align:center}.status-available{background-color:var(--success-bg);color:var(--success-color)}.status-borrowed{background-color:var(--error-bg);color:var(--error-color)}.status-reserved{background-color:var(--warning-bg);color:var(--warning-color)}.copies-info{display:flex;justify-content:space-between;font-size:.9rem;color:var(--text-secondary);padding:.5rem 0;border-top:1px solid var(--border-color)}.book-info-section{display:flex;flex-direction:column;gap:1.5rem}.book-info-section h1{font-size:2rem;font-weight:700;color:var(--text-primary);margin:0}.book-info-section h2{font-size:1.25rem;font-weight:500;color:var(--text-secondary);margin:0}.book-meta{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:1rem;padding:1rem;background-color:var(--bg-tertiary);border-radius:8px}.meta-item{display:flex;flex-direction:column;gap:.25rem}.meta-label{font-size:.8rem;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em}.meta-value{font-size:1rem;color:var(--text-primary);font-weight:500}.book-description{display:flex;flex-direction:column;gap:.75rem}.book-description h3{font-size:1.2rem;font-weight:600;color:var(--text-primary);margin:0}.book-description p{font-size:1rem;line-height:1.6;color:var(--text-primary);margin:0}.book-actions{display:flex;gap:1rem;margin-top:1rem}.borrow-button,.reserve-button{padding:1rem 2rem;border:none;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s ease;min-width:150px}.borrow-button{background-color:var(--primary-color);color:#fff}.borrow-button:hover{background-color:var(--primary-hover)}.reserve-button{background-color:var(--bg-secondary);color:var(--text-primary);border:1px solid var(--border-color)}.reserve-button:hover{background-color:var(--bg-tertiary)}.loading{text-align:center;padding:3rem 0;color:var(--text-secondary)}.error-message{text-align:center;padding:2rem;background-color:var(--error-bg);color:var(--error-color);border-radius:8px;margin-bottom:1rem;display:flex;flex-direction:column;gap:1rem;align-items:center}.error-message button{margin-top:1rem}@media(max-width:768px){.book-details-page{padding:1rem}.book-details-container{grid-template-columns:1fr}.book-cover{width:100%;max-width:300px;height:400px;margin:0 auto}.book-meta{grid-template-columns:1fr}.book-actions{flex-direction:column}.borrow-button,.reserve-button{width:100%}}@media(max-width:480px){.book-info-section h1{font-size:1.5rem}.book-info-section h2{font-size:1.1rem}.book-cover{height:350px}}:root{--primary-color: #5E6AD2;--primary-hover: #4A54C1;--secondary-color: #1F2937;--secondary-light: #374151;--success-color: #10B981;--success-hover: #059669;--warning-color: #F59E0B;--warning-hover: #D97706;--danger-color: #EF4444;--danger-hover: #DC2626;--info-color: #3B82F6;--info-hover: #2563EB;--text-primary: #111827;--text-secondary: #4B5563;--text-light: #9CA3AF;--text-white: #FFFFFF;--bg-primary: #F9FAFB;--bg-secondary: #FFFFFF;--bg-tertiary: #F3F4F6;--success-bg: #ECFDF5;--border-color: #E5E7EB;--border-light: #F3F4F6;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -1px rgba(0, 0, 0, .06);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -2px rgba(0, 0, 0, .05);--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--spacing-xl: 32px;--spacing-2xl: 48px;--border-radius: 6px;--border-radius-lg: 12px;--border-radius-xl: 16px;--transition: all .2s ease-in-out;--font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-size-xs: 12px;--font-size-sm: 14px;--font-size-md: 16px;--font-size-lg: 18px;--font-size-xl: 20px;--font-size-2xl: 24px;--sidebar-width: 280px;--sidebar-width-sm: 240px;--header-height: 64px;--main-content-max-width: 1200px}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%;margin:0;padding:0}body{font-family:var(--font-family);background-color:var(--bg-primary);color:var(--text-primary);line-height:1.65;font-size:var(--font-size-md);letter-spacing:.005em}p{margin-bottom:var(--spacing-md);line-height:1.7}h1,h2,h3,h4,h5,h6{line-height:1.2;letter-spacing:-.025em;font-weight:600}.container{max-width:var(--main-content-max-width);margin:0 auto;padding:var(--spacing-lg)}.app-container{display:flex;min-height:100vh;width:100vw}.main-content{flex:1;display:flex;flex-direction:column;margin-left:0;transition:var(--transition);background-color:#f5f7fa;min-height:100vh}.header{background-color:var(--bg-secondary);padding:var(--spacing-md) var(--spacing-lg);box-shadow:var(--shadow-sm);display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:100;max-width:1200px;margin:0 auto;width:100%}.header h1{margin:0;font-size:var(--font-size-lg);color:var(--text-primary);text-align:center;flex:1}.menu-btn{background:none;border:none;font-size:var(--font-size-xl);cursor:pointer;color:var(--text-primary);margin-right:var(--spacing-md);padding:var(--spacing-sm)}.menu-btn:hover{background-color:var(--bg-tertiary);border-radius:var(--border-radius);transform:none;box-shadow:none;color:var(--primary-color)}.user-menu{display:flex;align-items:center;gap:var(--spacing-md)}.user-menu span{font-size:var(--font-size-md);color:var(--text-primary)}.content{flex:1;padding:0 var(--spacing-lg) var(--spacing-lg);max-width:1200px;margin:0 auto;width:100%;display:flex;flex-direction:column;align-items:center}.card{background-color:var(--bg-secondary);padding:var(--spacing-lg);border:1px solid var(--border-color);border-radius:var(--border-radius-lg);box-shadow:0 4px 12px #00000014;margin-bottom:var(--spacing-lg);transition:var(--transition);max-width:1000px;margin-left:auto;margin-right:auto;width:100%}.card:hover{box-shadow:0 8px 24px #0000001f;transform:translateY(-2px)}.form-group{margin-bottom:var(--spacing-md);max-width:600px;margin-left:auto;margin-right:auto}table{width:100%;border-collapse:collapse;margin-top:var(--spacing-lg);background-color:var(--bg-secondary);border-radius:var(--border-radius);overflow:hidden;box-shadow:var(--shadow-sm);max-width:1000px;margin-left:auto;margin-right:auto}.action-bar{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-lg);gap:var(--spacing-md);max-width:1000px;margin-left:auto;margin-right:auto;width:100%}.action-buttons{display:flex;gap:var(--spacing-md);align-items:center}@media(max-width:768px){.action-bar{flex-direction:column;align-items:stretch}.action-bar .search-bar{width:100%}}.search-bar{margin-bottom:var(--spacing-lg);width:100%;max-width:600px;margin-left:auto;margin-right:auto}.search-input{width:100%;padding:var(--spacing-sm) var(--spacing-md);border:1px solid var(--border-color);border-radius:var(--border-radius);font-size:var(--font-size-md);transition:border-color .2s ease;background-color:var(--bg-secondary);color:var(--text-primary)}.search-input:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 2px #3b82f61a}.form-actions{display:flex;gap:var(--spacing-sm);margin-top:var(--spacing-md);justify-content:center}.section-title{text-align:center;margin-bottom:var(--spacing-xl);color:var(--secondary-color);font-size:var(--font-size-xl)}h1:not(.header h1){text-align:center;margin-bottom:var(--spacing-xl);color:var(--secondary-color);font-size:var(--font-size-xl)}h2{margin-bottom:var(--spacing-lg);color:var(--secondary-color);font-size:var(--font-size-lg)}h3{margin-bottom:var(--spacing-md);color:var(--secondary-color);font-size:var(--font-size-md)}.form-group{margin-bottom:var(--spacing-md)}.form-group label{display:block;margin-bottom:var(--spacing-xs);font-weight:700;color:var(--text-primary)}.form-group input,.form-group select,.form-group textarea{width:100%;padding:var(--spacing-sm);border:1px solid var(--border-color);border-radius:var(--border-radius);font-size:var(--font-size-md);transition:var(--transition)}.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 2px #3498db33}button{background-color:var(--primary-color);color:var(--text-white);border:none;padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--border-radius);cursor:pointer;font-size:var(--font-size-md);margin-right:var(--spacing-sm);transition:var(--transition);font-weight:500}button:hover{background-color:var(--primary-hover)!important;transform:none!important;box-shadow:none!important;border-color:transparent!important}button:active{transform:translateY(0)}button:disabled{background-color:var(--border-color);cursor:not-allowed;transform:none;box-shadow:none}button:disabled:hover{background-color:var(--border-color)}.btn-primary{background:linear-gradient(135deg,var(--primary-color),var(--primary-hover));transition:var(--transition);position:relative;overflow:hidden}.btn-primary:hover{transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-primary:active{transform:scale(.95);transition:transform .1s ease}.btn-success{background-color:var(--success-color)}.btn-success:hover{background-color:var(--success-hover)}.btn-warning{background-color:var(--warning-color)}.btn-warning:hover{background-color:var(--warning-hover)}.btn-danger{background-color:var(--danger-color)}.btn-danger:hover{background-color:var(--danger-hover)}.btn-info{background-color:var(--info-color)}.btn-info:hover{background-color:var(--info-hover)}.form-container{width:100%;max-width:600px;margin-bottom:var(--spacing-lg)}table{width:100%;border-collapse:collapse;margin-top:var(--spacing-lg);background-color:var(--bg-secondary);border-radius:var(--border-radius);overflow:hidden;box-shadow:var(--shadow-sm)}th,td{padding:var(--spacing-md);text-align:left;border-bottom:1px solid var(--border-color)}th{background-color:var(--bg-tertiary);font-weight:700;color:var(--text-primary);text-transform:uppercase;font-size:var(--font-size-sm);letter-spacing:.5px}tr:hover{background-color:var(--bg-tertiary);transition:var(--transition)}.status-available{color:var(--success-color);font-weight:700}.status-borrowed{color:var(--danger-color);font-weight:700}.status-returned{color:var(--info-color);font-weight:700}.loading{display:flex;justify-content:center;align-items:center;height:200px;font-size:var(--font-size-lg);color:var(--text-secondary)}@keyframes skeleton-loading{0%{background-position:200% 0}to{background-position:-200% 0}}.skeleton{background:linear-gradient(90deg,var(--bg-tertiary) 25%,var(--border-color) 50%,var(--bg-tertiary) 75%);background-size:200% 100%;animation:skeleton-loading 1.5s ease-in-out infinite;border-radius:var(--border-radius)}.skeleton-container{display:flex;flex-direction:column;gap:var(--spacing-md);padding:var(--spacing-lg)}.skeleton-item{display:flex;gap:var(--spacing-md);padding:var(--spacing-md);background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--border-radius-lg);box-shadow:var(--shadow-sm)}.skeleton-content{flex:1;display:flex;flex-direction:column;gap:var(--spacing-sm)}.skeleton-title{height:24px;width:70%;border-radius:var(--border-radius)}.skeleton-author{height:16px;width:50%;border-radius:var(--border-radius)}.skeleton-meta{height:14px;width:40%;border-radius:var(--border-radius)}.skeleton-actions{display:flex;gap:var(--spacing-sm);margin-top:var(--spacing-sm)}.skeleton-button{height:32px;width:80px;border-radius:var(--border-radius)}.error-message{background-color:#e74c3c1a;color:var(--danger-color);padding:var(--spacing-md);border-radius:var(--border-radius);margin-bottom:var(--spacing-lg);border-left:4px solid var(--danger-color)}.success-message{background-color:#27ae601a;color:var(--success-color);padding:var(--spacing-md);border-radius:var(--border-radius);margin-bottom:var(--spacing-lg);border-left:4px solid var(--success-color)}@media(max-width:768px){.container{padding:var(--spacing-md)}h1{font-size:var(--font-size-lg);margin-bottom:var(--spacing-lg)}h2{font-size:var(--font-size-md);margin-bottom:var(--spacing-md)}table{font-size:var(--font-size-sm)}th,td{padding:var(--spacing-sm)}button{padding:var(--spacing-xs) var(--spacing-sm);font-size:var(--font-size-sm)}}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:fadeIn .3s ease forwards}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-tertiary)}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--text-light)}.btn-secondary{background-color:var(--bg-tertiary);color:var(--text-primary)}.btn-secondary:hover{background-color:var(--border-color)}.app-container{display:flex;flex-direction:column;min-height:100vh}.app-footer{background-color:var(--background-color);border-top:1px solid var(--border-color);padding:var(--spacing-md) 0;margin-top:auto}.footer-content{max-width:var(--max-width);margin:0 auto;padding:0 var(--spacing-md);display:flex;flex-direction:column;align-items:center;gap:var(--spacing-sm)}.footer-content p{margin:0;font-size:var(--font-size-sm);color:var(--text-secondary)}.footer-content a{color:var(--primary-color);text-decoration:none;transition:var(--transition)}.footer-content a:hover{text-decoration:underline}.login-footer{margin-top:var(--spacing-lg);padding-top:var(--spacing-md);border-top:1px solid var(--border-color);text-align:center}.login-footer p{margin:var(--spacing-xs) 0;font-size:var(--font-size-sm);color:var(--text-secondary)}.login-footer a{color:var(--primary-color);text-decoration:none;transition:var(--transition)}.login-footer a:hover{text-decoration:underline}