Abfrage

<style>
.form-container{
max-width:600px;
margin:auto;
padding:25px;
background:#f9f9f9;
border-radius:8px;
box-shadow:0 4px 10px rgba(0,0,0,0.1);
font-family:Arial, sans-serif;
}

.form-container h2{
text-align:center;
margin-bottom:20px;
}

.form-group{
margin-bottom:15px;
}

.form-group label{
font-weight:bold;
display:block;
margin-bottom:5px;
}

.form-control{
width:100%;
padding:10px;
border:1px solid #ccc;
border-radius:4px;
}

.radio-group{
margin-top:5px;
}

.radio-group label{
margin-right:15px;
}

.btn-submit{
background:#2c7be5;
color:white;
border:none;
padding:12px 20px;
border-radius:5px;
cursor:pointer;
width:100%;
font-size:16px;
}

.btn-submit:hover{
background:#1a5fc1;
}

#helptext{
display:none;
}
</style>

<div class="form-container">

<h2>Teilnahme Formular</h2>

<form action="send.php" method="post">

<div class="form-group">
<label>Titel</label>
<input type="text" name="titel" class="form-control">
</div>

<div class="form-group">
<label>Vorname *</label>
<input type="text" name="vorname" class="form-control" required>
</div>

<div class="form-group">
<label>Name *</label>
<input type="text" name="name" class="form-control" required>
</div>

<div class="form-group">
<label>E-Mail *</label>
<input type="email" name="email" class="form-control" required>
</div>

<div class="form-group">
<label>Telefonnummer</label>
<input type="text" name="telefon" class="form-control">
</div>

<div class="form-group">
<label>Teilnahme</label>
<div class="radio-group">
<label><input type="radio" name="teilnahme" value="Ja" required> Ja</label>
<label><input type="radio" name="teilnahme" value="Nein"> Nein</label>
</div>
</div>

<div class="form-group">
<label>Mithilfe</label>
<div class="radio-group">
<label><input type="radio" name="mithilfe" value="Ja" onclick="toggleHelp(true)"> Ja</label>
<label><input type="radio" name="mithilfe" value="Nein" onclick="toggleHelp(false)"> Nein</label>
</div>
</div>

<div class="form-group" id="helptext">
<label>Ich kann helfen bei:</label>
<textarea name="helfen" class="form-control" rows="4"></textarea>
</div>

<button type="submit" class="btn-submit">Absenden</button>

</form>

</div>

<script>
function toggleHelp(show){
var field = document.getElementById("helptext");
if(show){
field.style.display="block";
}else{
field.style.display="none";
}
}
</script>