/* Reset default styles and use border-box for easier sizing */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Basic body styling and centering content */
body {
    font-family: 'Poppins', sans-serif;
    background-color: #f0f0f0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

/* Main container styling */
.container {
    background-color: #ffffff;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
    padding: 2rem;
    width: 90%;
    max-width: 400px;
    text-align: center;
}

/* Header styling */
header {
    margin-bottom: 2rem;
}

h1 {
    color: #4a4a4a;
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

/* Form layout */
.input-group {
    margin-bottom: 1rem;
}

/* Label styling */
label {
    display: block;
    color: #4a4a4a;
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

/* Input field styling */
input {
    width: 100%;
    padding: 0.8rem;
    font-size: 1.2rem;
    border: 2px solid #ddd;
    border-radius: 5px;
    text-align: center;
    transition: border-color 0.3s ease;
}

input:focus {
    outline: none;
    border-color: #4CAF50;
}

/* Button styling */
button {
    background-color: #4CAF50;
    color: white;
    border: none;
    padding: 0.8rem 2rem;
    font-size: 1.2rem;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

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

/* Result display styling */
#result {
    margin-top: 1rem;
    font-size: 1.2rem;
    font-weight: bold;
    padding: 1rem;
    border-radius: 5px;
}

/* Utility class to hide elements */
.hidden {
    display: none;
}

/* Media query for responsive design on smaller screens */
@media (max-width: 480px) {
    .container {
        width: 95%;
        padding: 1.5rem;
    }

    h1 {
        font-size: 2rem;
    }

    input, button {
        font-size: 1rem;
    }
}