body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
    background-color: #f5f5f5;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: #555;
}

input[type="text"] {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
    box-sizing: border-box;
}

button {
    background-color: #4CAF50;
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    width: 100%;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #45a049;
}

#responseMessage {
    margin-top: 20px;
    padding: 10px;
    border-radius: 4px;
    text-align: center;
}

.success {
    background-color: #dff0d8;
    color: #3c763d;
    padding: 10px;
    border-radius: 4px;
}

.error {
    background-color: #f2dede;
    color: #a94442;
    padding: 10px;
    border-radius: 4px;
}

.info {
    background-color: #d9edf7;
    color: #31708f;
    padding: 10px;
    border-radius: 4px;
    margin-top: 15px;
}

@media (max-width: 600px) {
    .container {
        padding: 15px;
    }
    
    h1 {
        font-size: 24px;
    }
}