:root {
            --primary: #6a0dad;
            --primary-dark: #4b0082;
            --primary-light: #9b59b6;
            --success: #4cc9a0;
            --danger: #f72585;
            --warning: #f8961e;
            --info: #4895ef;
            --light: #f8f9fa;
            --dark: #212529;
            --gray: #6c757d;
            --light-gray: #e9ecef;
            --white: #ffffff;
            --border-radius: 0.375rem;
            --box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;

            --sidebar-width: 280px;
            --sidebar-width-collapsed: 80px;
            --header-height: 80px;
            --transition-speed: 0.3s;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Poppins', sans-serif;
            background-color: #f5f7fb;
            color: var(--dark);
            line-height: 1.6;
            min-height: 100vh;
        }

        /* Main Content */
        .main-content {
            flex: 1;
            margin-left: var(--sidebar-width);
            transition: margin-left var(--transition-speed) ease;
            padding: 2rem;
            min-height: 100vh;
        }

        .sidebar.collapsed ~ .main-content {
            margin-left: var(--sidebar-width-collapsed);
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
        }

        /* Header */
        .header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1.5rem;
            margin-bottom: 1.5rem;
            background-color: var(--white);
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            position: sticky;
            top: 0;
            z-index: 10;
        }

        .header-content {
            display: flex;
            align-items: center;
            gap: 1rem;
            width: 100%;
        }

        .page-title {
            font-size: 1.75rem;
            font-weight: 600;
            color: var(--dark);
            display: flex;
            align-items: center;
            gap: 0.75rem;
            white-space: nowrap;
        }

        .page-title i {
            color: var(--primary);
            font-size: 1.5rem;
        }

        /* Search Box */
        .search-box {
            position: relative;
            max-width: 400px;
            width: 100%;
            margin-left: auto;
        }

        .search-box input {
            width: 100%;
            padding: 0.75rem 1rem 0.75rem 2.5rem;
            border: 1px solid var(--light-gray);
            border-radius: var(--border-radius);
            font-size: 0.9rem;
            transition: var(--transition);
            background-color: var(--white);
            box-shadow: 0 1px 2px rgba(0,0,0,0.05);
        }

        .search-box input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.15);
        }

        .search-box i {
            position: absolute;
            left: 1rem;
            top: 50%;
            transform: translateY(-50%);
            color: var(--gray);
        }

        /* Card */
        .card {
            background: var(--white);
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            margin-bottom: 2rem;
            overflow: hidden;
            border: none;
        }

        .card-header {
            padding: 1.25rem 1.5rem;
            border-bottom: 1px solid var(--light-gray);
            display: flex;
            justify-content: space-between;
            align-items: center;
            background-color: var(--white);
        }

        .card-title {
            font-size: 1.25rem;
            font-weight: 600;
            color: var(--dark);
        }

        .card-body {
            padding: 1.5rem;
        }

        /* Table */
        .table-responsive {
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            border-radius: var(--border-radius);
        }

        table {
            width: 100%;
            border-collapse: collapse;
            min-width: 600px;
        }

        th, td {
            padding: 1rem 1.25rem;
            text-align: left;
            vertical-align: middle;
        }

        thead th {
            background-color: var(--primary);
            color: var(--white);
            font-weight: 500;
            text-transform: uppercase;
            font-size: 0.75rem;
            letter-spacing: 0.5px;
            border-bottom: none;
        }

        thead th:first-child {
            border-top-left-radius: var(--border-radius);
        }

        thead th:last-child {
            border-top-right-radius: var(--border-radius);
        }

        tbody tr {
            border-bottom: 1px solid var(--light-gray);
            transition: var(--transition);
        }

        tbody tr:last-child {
            border-bottom: none;
        }

        tbody tr:hover {
            background-color: rgba(67, 97, 238, 0.05);
        }

        /* Student Info */
        .student-info {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: var(--primary);
            color: var(--white);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 600;
            flex-shrink: 0;
        }

        .student-details {
            line-height: 1.4;
        }

        .student-name {
            font-weight: 500;
            color: var(--dark);
        }

        .student-email {
            font-size: 0.8rem;
            color: var(--gray);
        }

        /* Badges */
        .badge {
            display: inline-block;
            padding: 0.35rem 0.75rem;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .badge-success {
            background-color: rgba(76, 201, 160, 0.1);
            color: var(--success);
        }

        .badge-danger {
            background-color: rgba(247, 37, 133, 0.1);
            color: var(--danger);
        }

        .badge-primary {
            background-color: rgba(67, 97, 238, 0.1);
            color: var(--primary-dark);
        }

        /* Action Buttons */
        .action-btns {
            display: flex;
            gap: 0.5rem;
        }

        .action-btn {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            border: none;
            background: transparent;
            color: var(--gray);
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .action-btn:hover {
            background: var(--light-gray);
            transform: translateY(-2px);
        }

        .btn-edit:hover {
            color: var(--info);
        }

        .btn-delete:hover {
            color: var(--danger);
        }

        /* Empty State */
        .empty-state {
            text-align: center;
            padding: 3rem 1rem;
            color: var(--gray);
        }

        .empty-state i {
            font-size: 3rem;
            margin-bottom: 1rem;
            color: var(--light-gray);
        }

        .empty-state h3 {
            font-weight: 500;
            margin-bottom: 0.5rem;
            color: var(--dark);
        }

        /* Pagination */
        .pagination {
            display: flex;
            justify-content: center;
            padding: 1.5rem 0;
            gap: 0.5rem;
        }

        .page-link {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            border: 1px solid var(--light-gray);
            color: var(--dark);
            text-decoration: none;
            transition: var(--transition);
        }

        .page-link:hover {
            background-color: var(--light-gray);
        }

        .page-link.active {
            background-color: var(--primary);
            color: var(--white);
            border-color: var(--primary);
        }

        /* Alert */
        .alert {
            padding: 1rem;
            margin-bottom: 1.5rem;
            border-radius: var(--border-radius);
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }

        .alert-danger {
            background-color: rgba(247, 37, 133, 0.1);
            color: var(--danger);
            border: 1px solid rgba(247, 37, 133, 0.2);
        }

        /* Responsive Styles */
        @media (max-width: 1200px) {
            .main-content {
                padding: 1.5rem;
            }
        }

        @media (max-width: 992px) {
            .header {
                flex-direction: column;
                align-items: stretch;
                gap: 1rem;
                padding: 1rem;
            }
            
            .search-box {
                max-width: 100%;
                margin-left: 0;
            }
            
            .page-title {
                font-size: 1.5rem;
            }
        }
        
        @media (max-width: 768px) {
            .main-content {
                padding: 1rem;
            }
            
            .page-title {
                font-size: 1.4rem;
            }
            
            .card-header {
                flex-direction: column;
                align-items: flex-start;
                gap: 1rem;
                padding: 1rem;
            }
            
            .card-body {
                padding: 1rem;
            }
            
            th, td {
                padding: 0.75rem;
            }
        }
        
        @media (max-width: 576px) {
            .page-title {
                font-size: 1.25rem;
            }
            
            .pagination {
                flex-wrap: wrap;
            }
        }