* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
        }
        
        .twv-admin-container {
            max-width: 1200px;
            margin: 0 auto;
            background: white;
            border-radius: 16px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
            overflow: hidden;
            animation: twv-slideIn 0.6s ease-out;
        }
        
        @keyframes twv-slideIn {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .twv-header {
            background: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);
            color: white;
            padding: 25px;
            position: relative;
            overflow: hidden;
        }
        
        .twv-header::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, #ff0000 0%, #ffffff 33%, #000000 66%, #ffffff 100%);
        }
        
        .twv-header h1 {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 24px;
            font-weight: 600;
        }
        
        .twv-header .twv-logo {
            width: 40px;
            height: 40px;
            background: white;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #2c3e50;
        }
        
        .twv-content {
            padding: 30px;
        }
        
        .twv-form-group {
            margin-bottom: 25px;
        }
        
        .twv-form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #2c3e50;
        }
        
        .twv-select, .twv-textarea {
            width: 100%;
            padding: 12px 16px;
            border: 2px solid #e9ecef;
            border-radius: 8px;
            font-size: 14px;
            transition: all 0.3s ease;
            font-family: inherit;
        }
        
        .twv-select:focus, .twv-textarea:focus {
            outline: none;
            border-color: #3498db;
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
        }
        
        .twv-textarea {
            resize: vertical;
            min-height: 120px;
        }
        
        .twv-users-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 15px;
            max-height: 400px;
            overflow-y: auto;
            padding: 15px;
            background: #f8f9fa;
            border-radius: 8px;
            border: 2px solid #e9ecef;
        }
        
        .twv-user-card {
            background: white;
            padding: 15px;
            border-radius: 8px;
            border: 1px solid #e9ecef;
            transition: all 0.3s ease;
            cursor: pointer;
        }
        
        .twv-user-card:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        
        .twv-user-card input[type="checkbox"] {
            margin-right: 10px;
            transform: scale(1.2);
        }
        
        .twv-user-info {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .twv-user-avatar {
            width: 35px;
            height: 35px;
            border-radius: 50%;
            background: linear-gradient(135deg, #3498db, #2980b9);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: 600;
            font-size: 14px;
        }
        
        .twv-user-details h4 {
            margin: 0 0 4px 0;
            font-size: 14px;
            color: #2c3e50;
        }
        
        .twv-user-details p {
            margin: 0;
            font-size: 12px;
            color: #6c757d;
        }
        
        .twv-status-badge {
            display: inline-block;
            padding: 2px 8px;
            border-radius: 12px;
            font-size: 11px;
            font-weight: 500;
            margin-left: 8px;
        }
        
        .twv-status-active {
            background: #d4edda;
            color: #155724;
        }
        
        .twv-status-pending {
            background: #fff3cd;
            color: #856404;
        }
        
        .twv-btn {
            background: linear-gradient(135deg, #3498db, #2980b9);
            color: white;
            border: none;
            padding: 12px 24px;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        
        .twv-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(52, 152, 219, 0.3);
        }
        
        .twv-btn:active {
            transform: translateY(0);
        }
        
        .twv-alert {
            padding: 15px;
            border-radius: 8px;
            margin-bottom: 20px;
            font-weight: 500;
            animation: twv-fadeIn 0.5s ease-out;
        }
        
        @keyframes twv-fadeIn {
            from { opacity: 0; transform: translateY(-10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .twv-alert-success {
            background: #d4edda;
            color: #155724;
            border: 1px solid #c3e6cb;
        }
        
        .twv-alert-error {
            background: #f8d7da;
            color: #721c24;
            border: 1px solid #f5c6cb;
        }
        
        .twv-select-all {
            margin-bottom: 15px;
            padding: 12px;
            background: #e9ecef;
            border-radius: 8px;
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 500;
        }
        
        .twv-select-all input[type="checkbox"] {
            transform: scale(1.2);
        }
        
        .twv-email-preview {
            margin-top: 20px;
            padding: 20px;
            background: #f8f9fa;
            border-radius: 8px;
            border: 1px solid #e9ecef;
        }
        
        .twv-email-preview h3 {
            margin-bottom: 15px;
            color: #2c3e50;
        }
        
        .twv-email-preview .twv-preview-content {
            background: white;
            padding: 15px;
            border-radius: 8px;
            font-size: 14px;
            line-height: 1.5;
        }
        
        @media (max-width: 768px) {
            .twv-users-grid {
                grid-template-columns: 1fr;
            }
        }