body {
    background-color: #1a1a1a;
    color: #f0f0f0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
}

.form-container {
    background-color: #2b2b2b;
    padding: 30px 40px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.3);
    width: 100%;
    max-width: 700px;
}

h1 {
    color: #ffffff;
    border-bottom: 2px solid #007bff;
    padding-bottom: 10px;
    margin-top: 0;
}

fieldset {
    border: 1px solid #444;
    border-radius: 8px;
    margin-bottom: 25px;
    padding: 20px;
}

legend {
    padding: 0 10px;
    font-weight: bold;
    color: #00aaff;
}

.options-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

label {
    display: flex;
    align-items: center;
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: background-color 0.2s;
}

label:hover {
    background-color: #3c3c3c;
}

input[type="radio"] {
    margin-right: 12px;
}

button {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 6px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    width: 100%;
    transition: background-color 0.2s;
}

button:hover {
    background-color: #0056b3;
}

button:disabled {
    background-color: #555;
    cursor: not-allowed;
}

#status-message {
    margin-top: 15px;
    text-align: center;
    font-weight: bold;
}