    <style>
        :root {
            --primary-color: #007bff;
            --secondary-color: #6c757d;
            --success-color: #28a745;
            --warning-color: #ffc107;
            --danger-color: #dc3545;
            --light-bg: #f8f9fa;
            --dark-bg: #343a40;
        }
        
        body {
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            min-height: 100vh;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        .admin-header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border-radius: 20px;
            margin-bottom: 2rem;
            overflow: hidden;
            box-shadow: 0 8px 32px rgba(102, 126, 234, 0.3);
        }
        
        .stats-card {
            background: white;
            border-radius: 15px;
            padding: 1.5rem;
            margin-bottom: 1.5rem;
            box-shadow: 0 4px 15px rgba(0,0,0,0.06);
            transition: all 0.3s ease;
            border: 1px solid #e9ecef;
        }
        
        .stats-card:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(0,0,0,0.1);
        }
        
        .stat-number {
            font-size: 2rem;
            font-weight: bold;
            display: block;
            margin-bottom: 0.5rem;
        }
        
        .stat-label {
            font-size: 0.9rem;
            color: var(--secondary-color);
        }
        
        .app-card {
            background: white;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 6px 20px rgba(0,0,0,0.08);
            margin-bottom: 1.5rem;
            transition: all 0.3s ease;
            border: 1px solid #e9ecef;
        }
        
        .app-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 30px rgba(0,0,0,0.15);
            border-color: #dee2e6;
        }
        
        .app-icon {
            width: 80px;
            height: 80px;
            object-fit: cover;
            border-radius: 16px;
            border: 2px solid #f1f3f4;
            transition: all 0.3s ease;
        }
        
        .app-card:hover .app-icon {
            transform: scale(1.05);
            border-color: #dee2e6;
        }
        
        .app-info h5 {
            margin: 0;
            color: #333;
            font-weight: 600;
        }
        
        .app-info p {
            margin: 4px 0;
            color: #666;
            font-size: 0.9em;
        }
        
        .btn-add {
            background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
            color: white;
            border: none;
            padding: 12px 24px;
            border-radius: 25px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        
        .btn-add:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(40, 167, 69, 0.3);
            color: white;
        }
        
        .category-badge {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-right: 6px;
            margin-bottom: 4px;
            transition: all 0.2s ease;
        }
        
        .category-badge:hover {
            transform: translateY(-1px);
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
        }
        
        .action-buttons .btn {
            margin-right: 0.5rem;
            margin-bottom: 0.5rem;
        }
        
        .upload-modal .modal-content {
            border-radius: 20px;
            overflow: hidden;
            border: none;
        }
        
        .upload-zone {
            border: 2px dashed #dee2e6;
            border-radius: 15px;
            padding: 3rem;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s ease;
            background: #f8f9fa;
        }
        
        .upload-zone:hover,
        .upload-zone.dragover {
            border-color: var(--primary-color);
            background: #e7f3ff;
        }
        
        .upload-icon {
            font-size: 3rem;
            color: #adb5bd;
            margin-bottom: 1rem;
        }
        
        .upload-zone:hover .upload-icon {
            color: var(--primary-color);
        }
        
        .app-preview {
            background: white;
            border-radius: 15px;
            padding: 1.5rem;
            margin-top: 1.5rem;
            box-shadow: 0 4px 15px rgba(0,0,0,0.06);
        }
        
        .progress-container {
            background: #f8f9fa;
            border-radius: 10px;
            height: 8px;
            overflow: hidden;
            margin: 1rem 0;
        }
        
        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
            width: 0%;
            transition: width 0.3s ease;
        }
        
        .sidebar {
            background: white;
            border-radius: 15px;
            padding: 1.5rem;
            box-shadow: 0 4px 15px rgba(0,0,0,0.06);
            height: fit-content;
        }
        
        .sidebar-nav {
            display: flex;
            flex-direction: column;
        }
        
        .sidebar-nav .nav-link {
            border-radius: 10px;
            padding: 0.75rem 1rem;
            margin-bottom: 0.5rem;
            color: var(--secondary-color);
            transition: all 0.2s ease;
            font-weight: 500;
        }
        
        .sidebar-nav .nav-link.active,
        .sidebar-nav .nav-link:hover {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            transform: translateX(4px);
        }
        
        .chart-container {
            background: white;
            border-radius: 15px;
            padding: 1.5rem;
            margin-bottom: 1.5rem;
            box-shadow: 0 4px 15px rgba(0,0,0,0.06);
        }
        
        .recent-apps {
            background: white;
            border-radius: 15px;
            padding: 1.5rem;
            box-shadow: 0 4px 15px rgba(0,0,0,0.06);
        }
        
        .recent-app-item {
            display: flex;
            align-items: center;
            padding: 0.75rem 0;
            border-bottom: 1px solid #e9ecef;
        }
        
        .recent-app-item:last-child {
            border-bottom: none;
        }
        
        .recent-app-icon {
            width: 40px;
            height: 40px;
            object-fit: cover;
            border-radius: 10px;
            margin-right: 1rem;
        }
        
        .recent-app-info {
            flex-grow: 1;
        }
        
        .recent-app-name {
            font-weight: 600;
            margin-bottom: 0.25rem;
        }
        
        .recent-app-date {
            font-size: 0.8rem;
            color: var(--secondary-color);
        }
        
        .app-rating {
            color: #ffc107;
            font-size: 0.9rem;
        }
        
        .app-stats {
            background: #f8f9fa;
            border-radius: 10px;
            padding: 0.5rem 1rem;
            font-size: 0.85rem;
            margin-top: 0.5rem;
        }
        
        @media (max-width: 768px) {
            .app-icon { 
                width: 70px; 
                height: 70px; 
            }
            .stat-number {
                font-size: 1.5rem;
            }
        }
    </style>