:root {
    --black: #222222;
    --white: #dddddd;
    --red: red;
}

body {
    max-width: 100vw;
    width: fit-content;
    height: 100vh;
    margin: 0 auto;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    flex-wrap: nowrap;
    align-content: center;
    justify-content: space-evenly;
    align-items: center;
    font-size: 5vmin;
    background-color: var(--white);
    color: var(--black);
}

#setup {
    width: 100%;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
}
#setup > div {
    margin: 0 10vmin;
}

#board {
    height: max-content;
    font-size: 18vmin
}
#board table {
    border-collapse: collapse;
    border-style: hidden;
}
#board table td {
    width: 25vmin;
    height: 25vmin;
    border: 0.6vmin solid var(--black);
    text-align: center;
    cursor: pointer;
}

#board table td[data-winning-animation] {
    animation-name: winning-animation;
    animation-duration: 1s;
    color: var(--red);
}

@keyframes winning-animation {
    0% {
        font-size: 18vmin;
        color: var(--black);
    }
    90% {
        font-size: 5vmin;
        color: var(--red);
    }
    100% {
        font-size: 18vmin;
        color: var(--black);
    }
}

dialog[open] {
    border: transparent;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--black);
    background-color: var(--white);
    font-size: 18vmin
}
dialog::backdrop {
    background-color: var(--white);
}
dialog button {
    background-color: var(--white);
    outline: none;
    border: 0.6vmin solid var(--black);
    border-radius: 9vmin;
    padding: 3vmin;
    font-size: 6vmin;
    color: var(--black);
    cursor: pointer;
    margin-top: 6vmin;
}
dialog span {
    text-align: center;
}


@media (prefers-color-scheme: dark) {
    :root {
        --black: #dddddd;
        --white: #222222;
        --red: darkred;
    }
}