body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    text-align: center;
    padding: 50px;
    margin: 0;
}

.container {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);
    max-width: 400px;
    margin: auto;
}

h1 {
    color: #333;
}

p {
    font-size: 16px;
    color: #555;
}

button {
    padding: 12px 20px;
    font-size: 16px;
    border: none;
    cursor: pointer;
    margin: 10px;
    border-radius: 5px;
    transition: 0.3s;
}

#start-conversation {
    background-color: #28a745;
    color: white;
}

#start-conversation:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

#leave-call {
    background-color: #dc3545;
    color: white;
}

#leave-call:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

#error-message {
    color: red;
    margin-top: 15px;
    font-weight: bold;
}

.hidden {
    display: none;
}