body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f4;
            padding: 40px 20px;
            display: flex;
            justify-content: center;
        }
        .container-checkout {
            background: white;
            padding: 30px;
            border-radius: 8px;
            box-shadow: 0 4px 10px rgba(0,0,0,0.1);
            width: 100%;
            max-width: 500px;
        }
        .resumo-produto {
            background-color: #e9ecef;
            padding: 15px;
            border-radius: 6px;
            margin-bottom: 20px;
            border-left: 5px solid #28a745;
        }
        .campo-grupo {
            margin-bottom: 15px;
        }
        label {
            display: block;
            margin-bottom: 5px;
            font-weight: bold;
        }
        input[type="text"], textarea {
            width: 100%;
            padding: 10px;
            border: 1px solid #ccc;
            border-radius: 4px;
            box-sizing: border-box;
        }
        .btn-finalizar {
            background-color: #007bff;
            color: white;
            border: none;
            padding: 12px;
            width: 100%;
            border-radius: 4px;
            font-size: 16px;
            cursor: pointer;
            font-weight: bold;
        }
        .btn-finalizar:hover {
            background-color: #0056b3;
        }
        .alerta-sucesso {
            background-color: #d4edda;
            color: #155724;
            padding: 15px;
            border-radius: 4px;
            margin-bottom: 20px;
            text-align: center;
        }
        .btn-voltar {
            display: inline-block;
            margin-top: 15px;
            color: #007bff;
            text-decoration: none;
        }