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    <form action="">
        <form action="">
          <legend><span>1</span>Основная информация</legend>
            <label for="name">Имя:</label>
            <input type="text" name="name">

            <label for="email">e-mail:</label>
            <input type="email" name="email">
            <label for="password">Пароль:</label>
            <input type="password" name="password">
            <input type="radio" name="age" value="under_18">
            <label class="light" for="under_18">Меньше 18</label>

            <input type="radio" name="age" value="over_18">
            <label class="light" for="over_18">Больше 18</label>
            <legend><span class="section">2</span>Ваш профиль</legend>

            <label for="bio">БИО:</label>
            <textarea name="bio" placeholder="Расскажите о себе"></textarea>

            <label for="job">Ваша профессия</label>
            <select name="job">
                    <option value="" selected="selected" disabled="disabled"></option>
                <optgroup label="Веб-разработка">
                    <option value="frontend_developer">Фронтенд разработчик</option>
                    <option value="php_developer">PHP разработчик</option>
                    <option value="python_developer">Python разработчик</option>
                    <option value="java_developer">Java разработчик</option>
                    <option value="web_designer">Веб-дизайнер</option>
                    <option value="wordpress_developer">Wordpress разработчик</option>
                <optgroup label="Мобильная разработка">
                        <option value="android_developer">Андроид разработчик</option>
                        <option value="ios_developer">iOS разработчик</option>
                        <option value="mobile_developer">Разработчик моб. приложений</option>
                <optgroup label="Бизнес">
                    <option value="business_owner">Свой бизнес</option>
                    <option value="freelancer">Фрилансер</option>
                    <option value="youtube_creator">Ютубер</option>


            <label class="light">Разработка
            <input type="checkbox" value="interest_development" name="user_interest">

            <label class="light">Веб-дизайн
            <input type="checkbox" value="interest_designer" name="user_interest">

            <label class="light">
            <input type="checkbox" value="interest_business" name="user_interest">

<button type="submit">Отпрвать</button>