body {
    font-family: Arial, sans-serif;
    background: #f4f4f4;
    margin: 0;
    padding: 0;
}
.container {
    max-width: 400px;
    margin: 60px auto;
    background: #fff;
    padding: 32px 24px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
h1 {
    text-align: center;
    color: #333;
}
form {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
input[type="text"] {
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 16px;
}
button {
    padding: 10px;
    background: #007bff;
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.2s;
}
button:hover {
    background: #0056b3;
}
#result {
    margin-top: 16px;
    text-align: center;
    color: #28a745;
    font-weight: bold;
}