:root {
    --primary-color: aqua;
    --hover-color: rgb(6, 216, 216);
    --bg-color: lightgreen;
    --card-bg-color: white;
    --shadow-color: gray;
    --font-family: 'Arial', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    height: 100vh;
    background-color: var(--bg-color);
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: var(--font-family);
}

main {
    background-color: var(--card-bg-color);
    border-radius: 15px;
    padding: 20px;
    text-align: center;
    max-width: 90vw;
    width: 400px;
    box-shadow: 0px 0px 10px var(--shadow-color);
}

h1 {
    margin-bottom: 15px;
    font-size: 2rem;
    color: #333;
}

button {
    width: 100%;
    background-color: var(--primary-color);
    border: none;
    border-radius: 5px;
    padding: 12px;
    margin-bottom: 15px;
    font-weight: bold;
    font-size: 1.25rem;
    color: #fff;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
    box-shadow: 0px 0px 5px var(--shadow-color);
}

button:hover {
    background-color: var(--hover-color);
}

button:active {
    transform: scale(0.97);
}

input[type="radio"] {
    margin: 0 10px 0 0;
}

label {
    font-size: 1rem;
    color: #555;
    margin-right: 20px;
    cursor: pointer;
}

output {
    display: none;
    font-size: 1.25rem;
    color: #333;
    margin-top: 20px;
    padding: 10px;
    background-color: #f9f9f9;
    border-radius: 8px;
    min-height: 50px;
    box-shadow: 0px 0px 5px var(--shadow-color);
}

@media (max-width: 500px) {
    main {
        width: 90%;
        padding: 15px;
    }
    
    h1 {
        font-size: 1.8rem;
    }

    button {
        font-size: 1.1rem;
        padding: 10px;
    }
}