:root {
            --primary: #2c3e50;
            --secondary: #3498db;
            --success: #27ae60;
            --danger: #e74c3c;
            --warning: #f39c12;
            --info: #9b59b6;
            --light: #f8f9fa;
            --dark: #343a40;
        }
        
        body {
            background-color: #f5f7fa;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            color: #333;
        }
        
        .navbar {
            background-color: var(--primary);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }
        
        .logo {
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, var(--secondary), #1e5799);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 20px;
            font-weight: bold;
            margin-right: 15px;
        }
        
        .logo-text {
            font-weight: 700;
            color: white;
            font-size: 1.5rem;
        }
        
        .nav-link {
            color: rgba(255, 255, 255, 0.85) !important;
            transition: all 0.3s;
            position: relative;
            padding: 10px 15px;
            font-weight: 500;
        }
        
        .nav-link:hover, .nav-link.active {
            color: white !important;
        }
        
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 0;
            width: 0;
            height: 3px;
            background-color: var(--secondary);
            transition: width 0.3s;
        }
        
        .nav-link:hover::after, .nav-link.active::after {
            width: 100%;
        }
        
        .search-container {
            background: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            padding: 25px;
            margin-top: 20px;
            margin-bottom: 30px;
        }
        
        .filters-section {
            background-color: #f8f9fa;
            border-radius: 10px;
            padding: 20px;
            margin-bottom: 20px;
            position: relative;
        }
        
        .filter-group {
            margin-bottom: 15px;
        }
        
        .filter-label {
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--primary);
        }
        
        .collapse-btn {
            position: absolute;
            top: 15px;
            right: 20px;
            background: none;
            border: none;
            color: var(--primary);
            font-size: 0.9rem;
        }
        
        .clear-filters {
            position: absolute;
            top: 15px;
            right: 120px;
        }
        
        .collapse-icon {
            transition: transform 0.3s;
        }
        
        .collapsed .collapse-icon {
            transform: rotate(180deg);
        }
        
        /* Table Styles */
        .table-container {
            background: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            padding: 25px;
            margin-top: 20px;
            overflow: hidden;
        }
        
        .results-table {
            width: 100%;
            border-collapse: separate;
            border-spacing: 0;
        }
        
        .results-table th {
            background: linear-gradient(135deg, #2c3e50, #374d64);
            color: white;
            padding: 12px 15px;
            text-align: left;
            position: sticky;
            top: 0;
            z-index: 10;
        }
        
        .results-table tr {
            transition: background-color 0.2s;
        }
        
        .results-table tr:nth-child(even) {
            background-color: #f9f9f9;
        }
        
        .results-table tr:hover {
            background-color: rgba(52, 152, 219, 0.05);
            cursor: pointer;
        }
        
        .results-table td {
            padding: 12px 15px;
            border-bottom: 1px solid #eee;
            vertical-align: middle;
        }
        
        .title-cell {
            font-weight: 500;
            color: var(--primary);
        }
        
        .badge-type {
            background-color: var(--secondary);
            font-weight: 500;
            padding: 4px 10px;
            border-radius: 12px;
            display: inline-flex;
            align-items: center;
        }
        
        .status-badge {
            padding: 4px 10px;
            border-radius: 12px;
            font-size: 0.85rem;
            font-weight: 500;
        }
        
        .status-available {
            background-color: rgba(46, 204, 113, 0.15);
            color: #27ae60;
        }
        
        .status-archived {
            background-color: rgba(231, 76, 60, 0.15);
            color: #e74c3c;
        }
        
        .action-cell {
            text-align: center;
            white-space: nowrap;
        }
        
        .action-btn {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-left: 5px;
            transition: all 0.3s;
        }
        
        .action-btn:hover {
            transform: scale(1.1);
        }
        
        .btn-edit {
            background-color: rgba(52, 152, 219, 0.1);
            color: #3498db;
        }
        
        .btn-delete {
            background-color: rgba(231, 76, 60, 0.1);
            color: #e74c3c;
        }
        
        .btn-request {
            background-color: rgba(241, 196, 15, 0.1);
            color: #f39c12;
        }
        
        .material-icon {
            font-size: 1.2rem;
            margin-right: 5px;
        }
        
        .material-book { color: #3498db; }
        .material-magazine { color: #e74c3c; }
        .material-newspaper { color: #27ae60; }
        .material-journal { color: #9b59b6; }
        .material-manuscript { color: #f39c12; }
        
        /* Modal Styles */
        .modal-content {
            border-radius: 15px;
            overflow: hidden;
        }
        
        .modal-header {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: white;
            padding: 15px 20px;
        }
        
        .modal-title {
            font-weight: 600;
        }
        
        .detail-item {
            display: flex;
            margin-bottom: 12px;
            align-items: flex-start;
        }
        
        .detail-label {
            font-weight: 600;
            color: var(--primary);
            min-width: 120px;
        }
        
        .detail-content {
            flex: 1;
        }
        
        .authors-list {
            display: flex;
            flex-wrap: wrap;
            gap: 5px;
        }
        
        .author-badge {
            background-color: #e0f7fa;
            color: #006064;
            border-radius: 12px;
            padding: 2px 10px;
            font-size: 0.85rem;
        }
        
        .pagination-controls {
            display: flex;
            justify-content: center;
            margin-top: 20px;
        }
        
        .page-item.active .page-link {
            background-color: var(--primary);
            border-color: var(--primary);
        }
        
        .page-link {
            color: var(--primary);
        }
        
        .results-count {
            font-size: 0.9rem;
            color: #6c757d;
            margin-bottom: 10px;
        }
        
        .pagination-info {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 15px;
            padding: 10px 15px;
            background-color: #f8f9fa;
            border-radius: 8px;
        }
        
        .book-cover {
            width: 100px;
            height: 150px;
            background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
            border-radius: 5px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 2rem;
            margin: 0 auto 15px;
        }
        
        .footer {
            background-color: var(--primary);
            color: white;
            padding: 30px 0;
            margin-top: 40px;
        }
        
        .footer a {
            color: #ddd;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer a:hover {
            color: white;
            text-decoration: underline;
        }
        
        .footer-logo {
            font-size: 24px;
            font-weight: bold;
            margin-bottom: 15px;
            display: flex;
            align-items: center;
        }
        
        .footer-logo i {
            margin-right: 10px;
        }
        
        .social-icons {
            display: flex;
            gap: 15px;
            margin-top: 20px;
        }
        
        .social-icons a {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: rgba(255, 255, 255, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            transition: background-color 0.3s;
        }
        
        .social-icons a:hover {
            background-color: var(--secondary);
        }