body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
    color: #333;
}

.container {
    max-width: 600px;
    margin: 50px auto;
    padding: 30px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 20px;
}

p {
    text-align: center;
    margin-bottom: 30px;
    color: #7f8c8d;
}

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

label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: #2c3e50;
}

input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
    box-sizing: border-box;
}

input[readonly] {
    background-color: #f9f9f9;
    color: #777;
}

button {
    width: 100%;
    padding: 14px;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #2980b9;
}

button:disabled {
    background-color: #95a5a6;
    cursor: not-allowed;
}

#message {
    margin-top: 20px;
    padding: 10px;
    border-radius: 4px;
}

.success {
    background-color: #d4edda;
    color: #155724;
    padding: 10px;
    border-radius: 4px;
}

.error {
    background-color: #f8d7da;
    color: #721c24;
    padding: 10px;
    border-radius: 4px;
}

@media (max-width: 768px) {
    .container {
        margin: 20px;
        padding: 20px;
    }
}