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

body {
    font-family: 'Arial', sans-serif;
    background: #f4f4f9;
    color: #333;
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 600px;
    margin: 50px auto;
    background: #ffffff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    font-size: 2.5rem;
    color: #4CAF50;
    margin-bottom: 20px;
}

form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

input[type="number"],
select,
button {
    padding: 10px;
    border: 2px solid #ddd;
    border-radius: 6px;
    font-size: 1rem;
}

input[type="number"],
select {
    width: 100%;
}

button {
    background: #4CAF50;
    color: white;
    cursor: pointer;
    transition: background 0.3s ease;
    border: none;
}

button:hover {
    background: #45a049;
}

/* Result */
#result {
    margin-top: 20px;
    padding: 15px;
    background: #f1f1f1;
    border-radius: 6px;
    text-align: center;
    font-size: 1.1rem;
}

@media screen and (max-width: 600px) {
    .container {
        width: 95%;
    }

    h1 {
        font-size: 2rem;
    }

    input[type="number"],
    select,
    button {
        font-size: 0.9rem;
    }
}