.container {
            background-color: #fff;
            padding: 20px;
            border-radius: 4px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
            max-width: 500px;
            width: 100%;
            box-sizing: border-box;
            margin-top: 20px;
        }
        h2, h3 {
            text-align: center;
            margin-bottom: 10px;
            margin-top: 5px;
        }
        label {
            display: block;
            margin-bottom: 5px;
            font-weight: bold;
        }
        input, select, textarea {
            width: 100%;
            padding: 10px;
            margin-bottom: 10px;
            border: 1px solid #ccc;
            border-radius: 4px;
            box-sizing: border-box;
        }
        input[type="radio"], input[type="checkbox"] {
            width: auto;
            margin-right: 10px;
        }
        .radio-group, .checkbox-group {
            display: flex;
            align-items: center;
            margin-bottom: 10px;
            flex-wrap: wrap;
        }
        .radio-group label, .checkbox-group label {
            margin-right: 20px;
        }
        button {
            padding: 12px;
            background-color: #1e90ff;
            color: #fff;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 16px;
        }
        button:hover {
            background-color: #32cd32;
        }
        .section {
            display: none;
        }
        .section.active {
            display: block;
        }
        .buttons {
            display: flex;
            justify-content: space-between;
        }
        .message {
            display: none;
            text-align: center;
            margin-top: 10px;
        }
        .message.success {
            color: green;
        }
        .message.error {
            color: red;
        }
        @media (max-width: 600px) {
            .container {
                padding: 15px;
            }
            input, select, textarea {
                padding: 8px;
            }
            button {
                padding: 8px;
                font-size: 14px;
            }
        }