body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    padding: 20px;
    text-align: center;
}

.container {
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0px 0px 10px gray;
    display: inline-block;
    width: 50%;
    text-align: left;
}

.form-group {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 10px 0;
}

input, select {
    padding: 10px;
    flex: 1;
    margin: 5px;
}

.small-select {
    width: 60px;
    padding: 5px;
}

button {
    padding: 10px;
    margin-top: 10px;
    display: block;
    margin-left: auto;
    margin-right: auto;
    font-size: 16px;
    font-weight: bold;
}

canvas {
    margin-top: 20px;
}

.result {
    font-size: 20px;
    font-weight: bold;
    color: #333;
}

footer {
    margin-top: 20px;
    font-size: 14px;
    color: gray;
}

h2 {
    text-align: center;
    font-size: 24px;
    font-weight: bold;
}

/* 🔥 Responsive styling starts here */
@media (max-width: 768px) {
    .container {
        width: 90%;
        padding: 15px;
    }

    .form-group {
        flex-direction: column;
        align-items: flex-start;
    }

    input, select {
        width: 100%;
        margin: 5px 0;
    }

    .small-select {
        width: 100%;
    }

    h2 {
        font-size: 22px;
    }

    button {
        width: 100%;
    }
}