body {
    font-family: Arial, sans-serif;
    background: #f2f4f8;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    background: #ffffff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
    text-align: center;
    width: 400px;
}

h2 {
    margin-bottom: 20px;
    color: #333;
}

input[type="text"] {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border-radius: 8px;
    border: 1px solid #ccc;
    font-size: 16px;
}

button {
    padding: 10px 20px;
    border: none;
    background-color: #0066ff;
    color: white;
    font-size: 16px;
    border-radius: 8px;
    cursor: pointer;
}

button:hover {
    background-color: #0050cc;
}

#result {
    margin-top: 20px;
    font-size: 16px;
}

.output {
    background: #e8f5e9;
    color: #2e7d32;
    padding: 15px;
    border-radius: 8px;
}

.output.error {
    background: #ffebee;
    color: #c62828;
}