@import url('https://fonts.googleapis.com/css?family=Montserrat:900');

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  user-select: none;
  -webkit-user-drag: none;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}

:root {
  --main-bg-color: #ffffff;
  --main-grey-color: #e0e0e0;
  --main-fg-color: #222222;
  --chessboard-white: #ffffff;
  --chessboard-border: #ffffff;
  --chessboard-black: #e0e0e0;
  --accent-selected: #448aff;
  --accent-hint: #83b9ff;
  --accent-opponent: #ff4081;
  --accent-menu: #448aff;
}

[data-theme="dark"] {
  --main-bg-color: #424242;
  --main-grey-color: #616161;
  --main-fg-color: #e0e0e0;
  --chessboard-white: #9e9e9e;
  --chessboard-border: #9e9e9e;
  --chessboard-black: #424242;
  --accent-selected: #3949AB;
  --accent-opponent: #ff4081;
  --accent-hint: #0D47A1;
  --accent-menu: #448aff;
}

body {
  font-family: sans-serif;
  font-weight: 700;
  font-size: 3vmin;
  background-color: var(--main-bg-color);
}
h1 {
  font-family: 'Montserrat';
  font-weight: 900;
  font-size: 7vh;
  line-height: 1.25;
  color: var(--main-fg-color);
}
a {
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  color: var(--main-fg-color);
}
a:hover,
a:active,
a.underline {
  box-shadow: inset 0 -1vmin 0 var(--accent-menu);
}
small {
  font-size: 4vmin;
  color: var(--main-grey-color);
}

.container {
  display: flex;
  width: 100vw;
  height: 100vh;
  max-height: 100%;
}

.hamburger {
  z-index: 2;
  position: fixed;
  width: 15vmin;
  height: 15vmin;
  max-width: 96px;
  max-height: 96px;
  cursor: pointer;
}
.hamburger div {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  transition: transform 0.2s ease;
}
.hamburger div:before {
  content: '';
  width: 50%;
  height: 12.5%;
  background: var(--main-fg-color);
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  margin: auto;
}
.hamburger .line-1 {
  transform: translateY(-12.5%);
}
.hamburger .line-2 {
  transform: translateY(12.5%);
}
.hamburger.open div:before {
  outline: 0 solid transparent;
}
.hamburger.open .line-1 {
  transform: rotate(225deg);
}
.hamburger.open .line-2 {
  transform: rotate(-225deg);
}

.board-container {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
}

.board {
  max-width: 768px;
  max-height: 768px;
  width: 100vmin;
  height: 100vmin;
}

@media (max-aspect-ratio: 125/100) and (min-aspect-ratio: 8/10) {
  .board {
    width: 80vmin;
    height: 80vmin;
  }
}
.board.flipped,
.board.flipped .square {
  transform: rotate(180deg);
}

.board .square {
  position: relative;
  width: 12.5%;
  height: 12.5%;
  float: left;
  background-color: var(--chessboard-white);
}
.board .black {
  background-color: var(--chessboard-black);
}
.board .square img {
  position: absolute;
  width: 100%;
  height: auto;
}
.board .square .highlight {
  position: absolute;
  width: 100%;
  height: 100%;
}
.board .square .dot {
  position: absolute;
  margin: 30%;
  width: 40%;
  height: 40%;
  border-radius: 50%;
  border: 0.6vmin solid var(--chessboard-border);
}
.color-selected {
  background-color: var(--accent-selected);
}
.color-opponent {
  background-color: var(--accent-opponent);
}
.color-hint {
  background-color: var(--accent-hint);
}
.color-menu {
  background-color: var(--accent-menu);
}

.menu {
  pointer-events: all;
  position: fixed;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  opacity: 1;
  transition: opacity 0.1s ease;
  z-index: 1;
  background-color: var(--main-bg-color);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.menu.hidden {
  pointer-events: none;
  opacity: 0;
}
.menu a img {
  padding: 1vh;
  width: 8vh;
  height: auto;
}

.dialog {
  pointer-events: all;
  position: fixed;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  padding: 2rem;
  opacity: 1;
  transition: opacity 0.1s ease;
  z-index: 1000;
  background-color: var(--main-bg-color);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.dialog.hidden {
  pointer-events: none;
  opacity: 0;
}
.dialog .dialog-content {
  display: grid;
  grid-template-rows: auto;
  grid-template-columns: auto 1fr auto;
  grid-template-areas: 'message message message' 'action-1 . action-2';
}
@media (max-width: 480px) {
  .dialog .dialog-content {
    grid-template-areas: 'message message message' 'action-1 . .' 'action-2 . .';
  }
}
.dialog-content h1 {
  grid-area: message;
}
.dialog-content a {
  box-shadow: inset 0 -1vmin 0 var(--accent-menu);
}
.dialog-content a:nth-child(1) {
  grid-area: action-1;
}
.dialog-content a:nth-child(2) {
  grid-area: action-2;
}