/* Base Styling */
body {
    text-align: center;
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

h1, h2, p, #start {
    margin: 10px;
}

/* Box Container */
.box {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* Button Rows */
.line1, .line2 {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

/* Color Buttons */
.btn {
    height: 35vw; /* responsive size based on viewport width */
    width: 35vw;
    max-width: 200px;
    max-height: 200px;
    min-width: 100px;
    min-height: 100px;
    border-radius: 50%;
    border: 5px solid black;
    margin: 10px;
    box-sizing: border-box;
    transition: 0.2s ease-in-out;
}

/* Color Classes */
.red {
    background-color: deeppink;
}
.green {
    background-color: lightseagreen;
}
.yellow {
    background-color: burlywood;
}
.blue {
    background-color: cornflowerblue;
}

/* Flash Animation */
.flash {
    background-color: white !important;
}

/* Responsive Typography */
h1 {
    font-size: 6vw;
    max-font-size: 40px;
}

h2 {
    font-size: 4vw;
    max-font-size: 24px;
}

p, #start {
    font-size: 3.5vw;
    max-font-size: 20px;
}

/* Media Query for Tablets and Up */
@media screen and (min-width: 768px) {
    .box {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .line1, .line2 {
        flex: 1 1 50%;
    }

    h1 {
        font-size: 36px;
    }

    h2 {
        font-size: 24px;
    }

    p, #start {
        font-size: 18px;
    }
}

/* Media Query for Desktops */
@media screen and (min-width: 1024px) {
    .btn {
        width: 180px;
        height: 180px;
    }
}