@keyframes spin {
  0% {
    transform: rotateZ(0deg);
  }
  100% {
    transform: rotateZ(360deg);
  }
}

/* bottom buttons */

#btn-flip-board {
  background-image: url('../img/icons/switch-enabled.svg');
}
#btn-flip-board.disabled {
  background-image: url('../img/icons/switch-disabled.svg');
}

#btn-switch-sides {
  background-image: url('../img/icons/switch-sides.svg');
}

#btn-save-pgn {
  background-image: url('../img/icons/save-pgn-enabled.svg');
}
#btn-save-pgn:hover {
}
#btn-save-pgn.disabled {
  background-image: url('../img/icons/save-pgn-disabled.svg');
}

#btn-show-hint .icon {
  background-image: url('../img/icons/hint-enabled.svg');
}
#btn-show-hint.disabled .icon {
  background-image: url('../img/icons/hint-disabled.svg');
}
#btn-show-hint.loading .icon {
  background-image: url('../img/icons/loading.svg');
  animation: spin 5s linear infinite;
}

#btn-engine-disable .active {
  text-decoration: line-through;
}

#btn-take-back {
  background-image: url('../img/icons/takeback-enabled.svg');
}
#btn-take-back.disabled {
  background-image: url('../img/icons/takeback-disabled.svg');
}

/* side buttons */

#btn-analyze .icon {
  background-image: url('../img/icons/analyze.svg');
}
#btn-analyze.loading .icon {
  background-image: url('../img/icons/loading.svg');
  animation: spin 5s linear infinite;
}

#btn-new-game .icon {
  background-image: url('../img/icons/new-game.svg');
}

#btn-resign {
  background-image: url('../img/icons/resign.svg');
}

#btn-settings {
  background-image: url('../img/icons/settings.svg');
}

/* main styles */

.buttons > button {
  background-color: #ffffff;
}

.chess-area {
  display: flex;
  display: -webkit-flex;
  justify-content: space-around;
  -webkit-justify-content: space-around;
  width: 100%;
  max-width: 810px;
  margin: 0 auto;
}

.chess-area .board-table {
  width: 100%;
  max-width: 480px;
}
.chess-area .board-table .board {
  width: 98%;
  margin: 9px 9px 9px 9px;
}
.chess-area .board-table .board.locked {
  position: relative;
  z-index: -1;
}
.chess-area .board-table .promotion {
  position: absolute;
  z-index: 1;
  top: 155px;
  height: 80px;
  width: 310px;
  display: flex;
  display: -webkit-flex;
  align-items: center;
  -webkit-align-items: center;
  justify-content: center;
  -webkit-justify-content: center;
  background: rgba(255, 255, 255, 0.9);
  border-radius: 4px;
}
.chess-area .board-table .promotion span {
  width: 70px;
  height: 70px;
  margin: 3px;
  display: flex;
  display: -webkit-flex;
  align-items: center;
  -webkit-align-items: center;
  justify-content: center;
  -webkit-justify-content: center;
  background: #fff;
  color: #333;
  font-weight: bold;
}
.chess-area .board-table .promotion span:hover {
  cursor: pointer;
  opacity: 0.8;
  text-decoration: underline;
}
.chess-area .board-table .promotion span.active {
  background: #dcdcdc;
}
.chess-area .board-table .promotion.hidden {
  display: none;
}
.chess-area .board-table .controls {
  display: flex;
  justify-content: space-between;
  width: 100%;
  margin: 15px 0 0 0;
  font-family: Arial;
  font-size: 12px;
  text-align: center;
  color: #ffffff;
}
.chess-area .board-table .controls .buttons {
  display: flex;
}
.chess-area .board-table .controls .messages {
  width: 100%;
  text-align: right;
}
.chess-area .board-table .top-controls {
  position: relative;
  display: flex;
  display: -webkit-flex;
  justify-content: center;
  -webkit-justify-content: center;
  font-family: Arial;
  font-size: 12px;
  text-align: center;
}
.chess-area .board-table .popup {
  position: absolute;
  box-sizing: border-box;
  z-index: 1;
  top: 155px;
  height: 140px;
  width: 310px;
  padding: 11px;
  display: flex;
  display: -webkit-flex;
  flex-direction: column;
  -webkit-flex-direction: column;
  align-items: center;
  -webkit-align-items: center;
  justify-content: center;
  -webkit-justify-content: center;
  background: #d5d5d5;
  border-radius: 2px;
}
.chess-area .board-table .popup.large {
  height: 250px;
  width: 310px;
}
.chess-area .board-table .popup label {
  width: 100%;
  margin: -5px 0 5px 0;
  font: bold 14px Arial;
  text-align: left;
}
.chess-area .board-table .popup textarea {
  width: 100%;
  height: calc(100% - 50px);
  box-sizing: border-box;
  padding: 5px 5px;
  font: normal 13px Arial;
}
.chess-area .board-table .popup button {
  width: 100%;
  height: 30px;
  margin: 2px 0 0 0;
  font: bold 13px Arial;
}
.chess-area .board-table .popup button:hover {
  cursor: pointer;
  opacity: 0.7;
}

.chess-area .board-table .controls button {
  display: block;
  width: 50px;
  height: 50px;
  margin: 3px 5px 0 8px;
  font-family: Arial;
  font-size: 12px;
  font-weight: bold;
  background-size: 50%;
  background-position: center;
  background-repeat: no-repeat;
  border-radius: 5px;
  border: 1px solid #bfbfbf;
  box-shadow: 1px 1px 3px -2px #888;
}

.chess-area .board-table .controls button:focus {
  outline: 0;
}

.chess-area .board-table .controls button:hover {
  cursor: pointer;
  opacity: 0.7;
  box-shadow: 0px 0px 3px -2px #888;
}

.chess-area .board-table .controls button.disabled {
  opacity: 0.5;
}

.chess-area .board-table .controls button.disabled:hover {
  cursor: initial;
}

.chess-area .board-table .controls button .icon {
  display: block;
  width: 100%;
  height: 100%;
  background-size: 50%;
  background-position: center;
  background-repeat: no-repeat;
}

.chess-area .board-table .popup .close {
  position: absolute;
  width: 18px;
  height: 18px;
  right: 8px;
  top: 5px;
  background-color: silver;
  border-radius: 100%;
  background-image: url('../img/icons/close.svg');
  background-repeat: no-repeat;
  background-position: center;
  background-size: 70%;
}
.chess-area .board-table .popup .close:hover {
  cursor: pointer;
  opacity: 0.8;
}

.chess-area .board-settings {
  box-sizing: border-box;
  display: flex;
  display: -webkit-flex;
  width: 100%;
  height: 482px;
  max-width: 280px;
  flex-direction: column;
  -webkit-flex-direction: column;
  align-items: center;
  -webkit-align-items: center;
}
.chess-area .board-settings .apex {
  box-sizing: border-box;
  width: 100%;
  min-height: 40px;
  display: flex;
  display: -webkit-flex;
  align-items: center;
  -webkit-align-items: center;
  justify-content: space-around;
  -webkit-justify-content: space-around;
  background-color: #d5d5d5;
}
.chess-area .board-settings .apex .label-history {
  font: bold 16px Arial;
  color: #2e2f30;
}
.chess-area .board-settings .apex .game-level {
  display: flex;
  display: -webkit-flex;
  align-items: center;
  -webkit-align-items: center;
  justify-content: space-between;
  -webkit-justify-content: space-between;
  width: 80px;
}
.chess-area .board-settings .apex .label {
  font: normal 16px Arial;
  color: #666666;
  text-decoration: underline;
  cursor: pointer;
}
.chess-area .board-settings .apex .label:hover {
  opacity: 0.8;
}
.chess-area .board-settings .apex .value {
  box-sizing: border-box;
  display: flex;
  display: -webkit-flex;
  justify-content: center;
  -webkit-justify-content: center;
  width: 31px;
  height: 28px;
  padding: 5px 0 0 0;
  background-image: url(../img/icons/monitor.svg);
  background-repeat: no-repeat;
  background-position: 0px 2px;
  font: bold 13px Arial;
  color: #666666;
  text-decoration: none;
}
.chess-area .board-settings .game-difficulty {
  display: flex;
  display: -webkit-flex;
  flex-direction: row;
  -webkit-flex-direction: row;
  justify-content: center;
  -webkit-justify-content: center;
  flex-wrap: wrap;
  -webkit-flex-wrap: wrap;
  box-sizing: border-box;
  width: calc(100% - 2px);
  min-height: 150px;
  margin: 0;
  background: #fff;
  border-bottom: 2px solid #d5d5d5;
}
.chess-area .board-settings .game-difficulty .label {
  box-sizing: border-box;
  width: calc(100% - 25px);
  padding: 6px 6px 3px 8px;
  font: bold 13px Arial;
}
.chess-area .board-settings .game-difficulty .close {
  display: block;
  width: 25px;
  height: 25px;
  margin: 0;
  background-size: 40%;
  background-position: center;
  background-repeat: no-repeat;
  background-image: url('../img/icons/close.svg');
}
.chess-area .board-settings .game-difficulty .close:hover {
  cursor: pointer;
  opacity: 0.7;
}
.chess-area .board-settings .game-difficulty .values {
  display: flex;
  display: -webkit-flex;
  flex-wrap: wrap;
  -webkit-flex-wrap: wrap;
  justify-content: center;
  -webkit-justify-content: center;
  padding: 3px;
}
.chess-area .board-settings .game-difficulty .values span {
  display: flex;
  display: -webkit-flex;
  align-items: center;
  -webkit-align-items: center;
  justify-content: center;
  -webkit-justify-content: center;
  box-sizing: border-box;
  width: 22px;
  height: 22px;
  margin: 3px;
  padding: 3px;
  border-radius: 12px;
  background: silver;
  font: normal 12px Arial;
  color: #333;
}
.chess-area .board-settings .game-difficulty .values span:hover {
  cursor: pointer;
  opacity: 0.7;
}
.chess-area .board-settings .game-difficulty .values span.selected {
  color: #333;
  background: #fff;
  border: 1px solid silver;
}
.chess-area .board-settings .game-difficulty select {
  width: 95%;
  margin: 5px;
  cursor: pointer;
  font-size: 100%;
}
.chess-area .board-settings .turns-history {
  width: 100%;
  flex-grow: 1;
  -webkit-flex-grow: 1;
  overflow-y: scroll;
  background: #fff;
  border: 1px solid #f5f5f5;
}
.chess-area .board-settings .turns-history ol {
  margin: 15px 0 10px 25px;
  padding: 0;
}
.chess-area .board-settings .turns-history ol li {
  position: relative;
  z-index: 0;
  margin: 0;
  padding: 5px;
  font: normal 13px Arial;
}
.chess-area .board-settings .turns-history ol li:nth-child(2n + 2) {
  background: #f3f3f3;
}

.chess-area .board-settings .turns-history ol li:before {
  display: block;
  content: '';
  position: absolute;
  height: 100%;
  width: 25px;
  left: -25px;
  top: 0;
  z-index: -1;
}

.chess-area .board-settings .turns-history ol li:nth-child(odd):before {
  background: transparent;
}

.chess-area .board-settings .turns-history ol li:nth-child(even):before {
  background: #f3f3f3;
}

.chess-area .board-settings .turns-history ol li:hover {
  background: #ffffc7;
  cursor: pointer;
}
.chess-area .board-settings .turns-history ol li:hover:before {
  background: #ffffc7;
}
.chess-area .board-settings .turns-history ol li span {
  display: inline-block;
  width: 50px;
  margin: 0 15px 0 6px;
}
.chess-area .board-settings .turns-history ol li span:hover {
  text-decoration: underline;
  background-color: silver;
}
.chess-area .board-settings .game-analyze {
  width: 100%;
  box-sizing: border-box;
  padding: 6px 0px 5px 7px;
  font: normal 12px Arial;
  color: #333;
  text-align: left;
  background-color: #f1f1f1;
  border-top: 1px solid silver;
}

.chess-area .board-settings .game-menu {
  box-sizing: border-box;
  display: flex;
  display: -webkit-flex;
  flex-wrap: wrap;
  -webkit-flex-wrap: wrap;
  width: 100%;
  min-height: 105px;
  padding: 5px 0 10px 5px;
  border-top: 2px solid #f1f1f1;
  background: #fff;
}
.chess-area .board-settings .game-menu .label-choose-side {
  width: 100%;
  margin: 5px;
  font: bold 14px Arial;
}
.chess-area .board-settings .game-menu .btn {
  display: block;
  width: 105px;
  height: 51px;
  margin: 5px 5px 0px 5px;
  border: 3px solid #fff;
  border-radius: 5px;
  background-size: 30%;
  background-repeat: no-repeat;
  background-position: center;
}
.chess-area .board-settings .game-menu .game-white-side {
  background-color: #dbdbdb;
}
.chess-area .board-settings .game-menu .game-black-side {
  background-color: #444546;
}
.chess-area .board-settings .game-menu .btn:hover {
  cursor: pointer;
  opacity: 0.8;
}
.chess-area .board-settings .game-menu .btn.selected {
  border: 3px solid #68ba3a;
}
.chess-area .board-settings .game-menu .btn.locked {
  opacity: 0.5;
  cursor: default;
}
.chess-area .board-settings .game-menu .game-black-side {
  background-image: url('../img/icons/choose-black.svg');
}
.chess-area .board-settings .game-menu .game-white-side {
  background-image: url('../img/icons/choose-white.svg');
}
.chess-area .board-settings .tunes {
  width: 100%;
  min-height: 65px;
  margin: 0;
  padding: 0;
  display: flex;
  display: -webkit-flex;
  justify-content: center;
  -webkit-justify-content: center;
  align-items: center;
  -webkit-align-items: center;
  background-color: #f5f5f5;
}

.chess-area .board-settings .btn-new-game {
  display: flex;
  display: -webkit-flex;
  align-items: center;
  -webkit-align-items: center;
  width: 92px;
  height: 51px;
  margin: 0 3px 0 2px;
  border: none;
  border-radius: 3px;
  background: #d41c3b;
  font-size: 14px;
  line-height: 100%;
  text-transform: none;
  color: #fff;
}
.chess-area .board-settings .btn-new-game:hover {
  opacity: 0.8;
  cursor: pointer;
}
.chess-area .board-settings .btn-new-game .icon {
  display: block;
  min-width: 30px;
  width: 30px;
  min-height: 30px;
  height: 30px;
  margin: 0 7px;
  background-position: center;
  background-repeat: no-repeat;
  background-size: contain;
}
.chess-area .board-settings .btn-new-game .label {
  font-family: Arial;
  font-size: 14px;
  line-height: 100%;
  text-transform: none;
  color: #fff;
}
.chess-area .board-settings .tunes .btn {
  display: block;
  width: 49px;
  height: 49px;
  margin: 0 3px;
  background-color: #d4d4d4;
  border: 1px solid #bfbfbf;
  border-radius: 3px;
  background-size: 50%;
  background-position: center;
  background-repeat: no-repeat;
  box-shadow: 1px 1px 3px -2px #888;
}
.chess-area .board-settings .tunes .btn:hover {
  cursor: pointer;
  opacity: 0.8;
  box-shadow: 0px 0px 3px -2px #888;
}
.chess-area .board-settings .tunes .btn.disabled {
  opacity: 0.4;
  color: #999;
}
.chess-area .board-settings .tunes .btn .icon {
  display: block;
  width: 100%;
  height: 100%;
  background-size: 50%;
  background-position: center;
  background-repeat: no-repeat;
}
.chess-area .board-settings .params {
  width: 100%;
}
.chess-area .board-settings .params .cell.locked {
  opacity: 0.5;
}
.chess-area .board-settings .params .cell {
  display: flex;
  display: -webkit-flex;
  width: 100%;
  height: 25px;
  margin: 0 0 7px 0;
  font: bold 14px Arial;
}
.chess-area .board-settings .params .cell label {
  display: flex;
  display: -webkit-flex;
  align-items: center;
  -webkit-align-items: center;
  width: 70px;
  margin: 0 7px 0 0;
}
.chess-area .board-settings .params .cell select {
  margin: 4px 0 0 5px;
}
.chess-area .board-settings .cell span {
  display: flex;
  display: -webkit-flex;
  align-items: center;
  -webkit-align-items: center;
  width: 58px;
  margin: 0 5px;
  padding: 3px 7px;
  font: normal 13px Arial;
  background: #fafafa;
  border-radius: 2px;
}
.chess-area .board-settings .cell span.active {
  background: silver;
  color: #fff;
}
.chess-area .board-settings .cell span:hover {
  cursor: pointer;
  opacity: 0.7;
}
.chess-area .board-settings .sides {
}
.chess-area .board-settings .castling {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 10px 0;
}
.chess-area .board-settings .castling .caption {
  margin: 10px 0 10px 0;
  font-size: 15px;
  font-weight: bold;
}
.chess-area .board-settings .castling .opts {
  display: flex;
  font-size: 12px;
}
.chess-area .board-settings .castling .opts label {
}
.chess-area .board-settings .castling .opts label:hover {
  cursor: pointer;
  opacity: 0.7;
}
.chess-area .board-settings .castling .opts input {
}
.chess-area .board-settings .buttons {
  width: 100%;
  display: flex;
  flex-direction: column;
  -webkit-flex-direction: column;
  align-items: flex-end;
  -webkit-align-items: flex-end;
}

.chess-area .board-settings button {
  box-sizing: border-box;
  width: 100%;
  height: 100%;
  height: 50px;
  margin: 5px 0;
  border: 2px solid #90a7e8;
  background-color: #fff;
  text-transform: uppercase;
  font-size: 13px;
  text-align: left;
  text-indent: 51px;
}
.chess-area .board-settings button:hover {
  cursor: pointer;
  opacity: 0.7;
}
.chess-area .board-settings button.disabled {
  opacity: 0.6;
  color: #999;
}

.chess-area .board-settings .socials {
  display: flex;
  justify-content: flex-end;
  width: 100%;
  padding: 10px 0 0 0;
}

@media (max-width: 810px) {
  .chess-area {
    align-items: center;
    -webkit-align-items: center;
    flex-direction: column;
    -webkit-flex-direction: column;
    width: auto;
  }

  .chess-area .board-table {
    display: flex;
    display: -webkit-flex;
    flex-direction: column;
    -webkti-flex-direction: column;
    justify-content: center;
    -webkit-justify-content: center;
    align-items: center;
    -webkit-align-items: center;
  }

  .chess-area .board-settings {
    max-width: 450px;
    margin: 20px 0 30px 0;
    padding: 2px;
  }

  .chess-area .board-settings .buttons {
    align-items: center;
    -webkit-align-items: center;
  }

  .chess-area .board-table .controls .messages {
    width: 100%;
  }

  .chess-area .board-table .controls .status {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-grow: 1;
    font-size: 120%;
    font-weight: bold;
    color: #696868;
  }
}

@media (max-width: 768px) {
  .chess-area .board-table .controls .buttons {
    justify-content: space-between;
  }
  .chess-area .board-table .controls {
    flex-direction: column-reverse;
  }
  .chess-area .board-table .controls .status {
    margin: 0 0 10px 0;
  }
}

.hidden {
  display: none !important;
}

.chess-log {
  width: 100%;
  max-width: 780px;
  margin: 30px auto 40px auto;
  font: normal 12px/18px Arial;
}