@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: #757575;
  --main-fg-color: #222222;
  --accent-selected: #448aff;
  --accent-hint: #83b9ff;
  --accent-opponent: #ff4081;
  --accent-menu: #448aff;
  --square-highlight-selected: rgba(68, 138, 255, 0.35);
  --square-highlight-opponent: rgba(255, 64, 129, 0.30);
  --square-highlight-hint: rgba(131, 185, 255, 0.25);
}

[data-theme="dark"] {
  --main-bg-color: #222222;
  --main-grey-color: #616161;
  --main-fg-color: #cccccc;
  --accent-selected: #448aff;
  --accent-opponent: #ff4081;
  --accent-hint: #83b9ff;
  --accent-menu: #ff4081;
  --square-highlight-selected: rgba(68, 138, 255, 0.35);
  --square-highlight-opponent: rgba(255, 64, 129, 0.30);
  --square-highlight-hint: rgba(131, 185, 255, 0.25);
}

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-wrapper {
  position: relative;
  width: 88vmin;
  height: 98vmin;
  max-width: 704px;
  max-height: 784px;
}

.board-lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}
.board-lines .grid-line {
  stroke: var(--main-fg-color);
  stroke-width: 2;
  fill: none;
  opacity: 0.6;
}
.board-lines .palace-line {
  stroke: var(--main-fg-color);
  stroke-width: 1.5;
  fill: none;
  opacity: 0.6;
}
.board-lines .board-label {
  fill: var(--main-fg-color);
  opacity: 0.3;
}

.piece-cell {
  position: absolute;
  z-index: 1;
  transform: translate(-50%, -50%);
  width: 12%;
  height: 12%;
  cursor: pointer;
}

.piece-cell .highlight {
  position: absolute;
  inset: -15%;
  border-radius: 8px;
  z-index: -1;
}

.piece-cell .highlight.color-selected {
  background: var(--square-highlight-selected);
}
.piece-cell .highlight.color-opponent {
  background: var(--square-highlight-opponent);
}
.piece-cell .highlight.color-hint {
  background: var(--square-highlight-hint);
}

.piece-cell .dot {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 40%;
  height: 40%;
  border-radius: 50%;
  z-index: 2;
}
.dot.color-selected {
  background: var(--accent-selected);
  opacity: 0.6;
}
.dot.color-opponent {
  background: var(--accent-opponent);
  opacity: 0.6;
}
.dot.color-hint {
  background: var(--accent-hint);
  opacity: 0.6;
}

.piece-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
}
.piece-disc.side-a {
  fill: var(--main-bg-color);
  stroke: var(--main-fg-color);
  stroke-width: 2;
}
.piece-disc.side-b {
  fill: var(--main-fg-color);
  stroke: var(--main-bg-color);
  stroke-width: 2;
}
.piece-glyph {
  font-size: 18px;
  font-weight: bold;
  font-family: serif;
}
.piece-glyph.side-a {
  fill: var(--main-fg-color);
}
.piece-glyph.side-b {
  fill: var(--main-bg-color);
}

.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;
}
.level-icon {
  padding: 1vh;
  width: 8vh;
  height: auto;
}
.level-icon.active {
  background-color: var(--accent-menu);
  border-radius: 4px;
}
.menu .controls-bar {
  position: fixed;
  top: 0;
  right: 0;
  display: flex;
  align-items: center;
  gap: 1vmin;
  padding-right: 2vmin;
}
.menu .lang-select {
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  border: 1.5px solid var(--main-grey-color);
  border-radius: 6px;
  color: var(--main-fg-color);
  font-family: inherit;
  font-weight: 700;
  font-size: 0.85rem;
  padding: 0.3em 0.5em;
  cursor: pointer;
}
.menu .lang-select option {
  background: var(--main-bg-color);
  color: var(--main-fg-color);
}
.menu .dark-mode-switch {
  width: 15vmin;
  height: 15vmin;
  max-width: 96px;
  max-height: 96px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.switch {
  position: relative;
  background: transparent;
  border: 0;
  width: 30px;
  height: 30px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.switch .mode {
  position: relative;
  width: 20px;
  height: 20px;
  transition: transform 0.45s ease;
  border-radius: 50%;
  background: #1a202c;   
}

.switch .mode::before {
  content: "";
  position: absolute;
  width: 6px;
  height: 6px;
  left: 50%;
  top: 50%;
  transform: translateX(-50%) translateY(-50%);
  border-radius: 50%;
  background: inherit;
  z-index: -1;
  opacity: 0;
  transition: box-shadow 0.4s 0s ease;
}

.switch .mode::after {
  content: "";
  position: absolute;
  width: 90%;
  height: 90%;
  top: -20%;
  left: 30%;
  border-radius: 50%;
  background: white;
  transition: transform 0.45s ease;
}

.dark .switch .mode {
  transform: scale(0.5);
  background: white;
}

.dark .switch .mode::before {
  opacity: 1;
  box-shadow: 0 -20px 0 0 white, 0 20px 0 0 white, -20px 0 0 0 white,
  20px 0 0 0 white, 15px 15px 0 0 white, 15px -15px 0 0 white,
  -15px 15px 0 0 white, -15px -15px 0 0 white;
}

.dark .switch .mode::after {
  opacity: 0;
  transition: background 0.45s ease;
  transform: translateX(50%) translateY(-50%);
}

.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;
}