:root {
            --primary-color: #4361ee;
            --secondary-color: #f8f9fa;
            --accent-color: #3f37c9;
            --text-color: #212529;
            --light-gray: #e9ecef;
            --border-color: #dee2e6;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: #f5f7fb;
            color: var(--text-color);
            padding-top: 20px;
            padding-bottom: 60px;
        }
        
        .header-container {
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            color: white;
            padding: 15px 0;
            border-radius: 10px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            margin-bottom: 25px;
        }
        
        .logo img {
            height: 40px;
            filter: brightness(0) invert(1);
        }
        
        .nav-top ul {
            display: flex;
            list-style: none;
            padding: 0;
            margin: 0;
        }
        
        .nav-top li {
            margin-right: 25px;
        }
        
        .nav-top a {
            color: rgba(255,255,255,0.85);
            text-decoration: none;
            font-weight: 500;
            padding: 8px 0;
            transition: color 0.3s;
            border-bottom: 2px solid transparent;
        }
        
        .nav-top a:hover, .nav-top a.active {
            color: white;
            border-bottom: 2px solid white;
        }
        
        .user-info {
            display: flex;
            align-items: center;
            gap: 15px;
        }
        
        .user-info a {
            color: rgba(255,255,255,0.85);
            font-size: 1.2rem;
            transition: color 0.3s;
        }
        
        .user-info a:hover {
            color: white;
        }
        
        .sidebar {
            background: white;
            border-radius: 10px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.05);
            padding: 0;
            height: fit-content;
        }
        
        .sidebar h2 {
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            color: white;
            padding: 15px;
            margin: 0;
            border-radius: 10px 10px 0 0;
            font-weight: 600;
        }
        
        .sidebar ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        
        .sidebar li {
            border-bottom: 1px solid var(--light-gray);
        }
        
        .sidebar a {
            display: block;
            padding: 12px 20px;
            color: var(--text-color);
            text-decoration: none;
            transition: all 0.3s;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .sidebar a:hover {
            background-color: var(--secondary-color);
            color: var(--primary-color);
            transform: translateX(5px);
        }
        
        .main-content {
            background: white;
            border-radius: 10px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.05);
            padding: 25px;
        }
        
        .breadcrumb {
            background: none;
            padding: 0;
            margin-bottom: 20px;
            font-size: 0.9rem;
        }
        
        .breadcrumb-item a {
            color: var(--primary-color);
            text-decoration: none;
        }
        
        .content-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 25px;
            flex-wrap: wrap;
            gap: 15px;
        }
        
        .content-title {
            font-weight: 600;
            color: var(--text-color);
            margin: 0;
        }
        
        .btn-add {
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            border: none;
            color: white;
            padding: 8px 20px;
            border-radius: 6px;
            transition: all 0.3s;
        }
        
        .btn-add:hover {
            opacity: 0.9;
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(67, 97, 238, 0.3);
        }
        
        .table {
            border-collapse: separate;
            border-spacing: 0;
            width: 100%;
        }
        
        .table th {
            background-color: var(--secondary-color);
            font-weight: 600;
            color: var(--text-color);
            border-top: none;
            border-bottom: 2px solid var(--border-color);
        }
        
        .table th, .table td {
            padding: 12px 15px;
            vertical-align: middle;
        }
        
        .table tbody tr {
            border-bottom: 1px solid var(--light-gray);
            transition: background-color 0.2s;
        }
        
        .table tbody tr:hover {
            background-color: rgba(67, 97, 238, 0.03);
        }
        
        .action-btn {
            padding: 6px 12px;
            font-size: 0.85rem;
            margin: 0 2px;
        }
        
        .btn-edit {
            background: #4cc9f0;
            border: none;
            color: white;
        }
        
        .btn-delete {
            background: #f72585;
            border: none;
            color: white;
        }
        
        .footer {
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            color: white;
            padding: 40px 0 20px;
            margin-top: 50px;
            border-radius: 15px 15px 0 0;
        }
        
        .footer h5 {
            color: rgba(255,255,255,0.9);
            font-weight: 600;
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 10px;
        }
        
        .footer h5::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 50px;
            height: 2px;
            background: rgba(255,255,255,0.5);
        }
        
        .footer p {
            color: rgba(255,255,255,0.8);
            margin-bottom: 10px;
            font-size: 0.9rem;
        }
        
        .footer-links {
            list-style: none;
            padding: 0;
        }
        
        .footer-links li {
            margin-bottom: 10px;
        }
        
        .footer-links a {
            color: rgba(255,255,255,0.8);
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-links a:hover {
            color: white;
        }
        
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 20px;
            margin-top: 30px;
            text-align: center;
            color: rgba(255,255,255,0.7);
            font-size: 0.85rem;
        }
        
        @media (max-width: 992px) {
            .nav-top ul {
                flex-wrap: wrap;
                gap: 10px;
            }
            
            .nav-top li {
                margin-right: 15px;
            }
            
            .content-header {
                flex-direction: column;
                align-items: flex-start;
            }
            
            .footer {
                padding: 30px 0 15px;
            }
        }