:root {
  font-family: sans-serif;
  --board-size: 19;
  --board-image: url("/static/board19.svg");
  --board-image-dark: url("/static/board19.svg");
}

body {
  margin: 0;
}

#create-form {
  margin: 8px auto;
  border-style: solid;
  border-radius: 8px;
  padding: 16px;
  width: fit-content;
}

#create-form > * {
  margin-top: 4px;
}

#create-form > button {
  width: 100%;
}

dialog {
  margin-top: 20vh;
}

dialog form {
  text-align: right;
}

dialog button {
  padding-left: 8px;
  padding-right: 8px;
}

#board {
  display: grid;
  grid-template-columns: repeat(var(--board-size), 1fr);
  grid-template-rows: repeat(var(--board-size), 1fr);
  width: 90vmin;
  height: 90vmin;
  margin: 5vmin auto;
  background-size: 100%;
  background-repeat: no-repeat;
  background-position: center;
  border-radius: 16px;
}

@media (prefers-color-scheme: light) {
  #board {
    background-image: var(--board-image);
  }
}

@media (prefers-color-scheme: dark) {
  #board {
    background-image: var(--board-image-dark);
  }
}

#board button {
  background-color: transparent;
  border: none;
  padding: 0;
}

#board button:hover {
  background-color: #fff4;
}
#board button:active {
  background-color: #fff4;
  border: 1px solid #fff8;
}

#board span {
  margin: 5% 5%;
  border-radius: 50% 50%;
}

#board span.black {
  background-color: black;
}

#board span.white {
  background-color: white;
}