.shudan-goban {
    --shudan-board-border-width: .15em;
    --shudan-board-border-color: #CA933A;

    --shudan-board-background-color: #F1B458;
    --shudan-board-foreground-color: #5E2E0C;

    --shudan-black-background-color: #222;
    --shudan-black-foreground-color: #eee;

    --shudan-white-background-color: #eee;
    --shudan-white-foreground-color: #222;

    position: relative;
    border: var(--shudan-board-border-width) solid var(--shudan-board-border-color);
    color: var(--shudan-board-foreground-color);
  }
  .shudan-goban:not(.shudan-coordinates) {
    padding: .25em;
  }
  .shudan-goban-image {
    background: url('./board.png') var(--shudan-board-background-color);
}

.shudan-coordx span, .shudan-coordy span {
  font-size: .6em;
}

.shudan-vertex div {
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
}

/* Board gradient */

.shudan-goban::after {
  content: '';
  position: absolute;
  top: calc(-1 * var(--shudan-board-border-width));
  left: calc(-1 * var(--shudan-board-border-width));
  bottom: calc(-1 * var(--shudan-board-border-width));
  right: calc(-1 * var(--shudan-board-border-width));
  background: linear-gradient(to bottom, rgba(234, 220, 192, .1), transparent),
    linear-gradient(to bottom, transparent, rgba(23, 10, 2, .05));
  pointer-events: none;
  z-index: 3;
}

/* Busy screen */

.shudan-goban.shudan-busy::after {
  animation: 2s linear -.5s shudan-busy infinite;
  background-color: rgba(23, 10, 2, .1);
  background-image: linear-gradient(to right, transparent 30%, rgba(255, 255, 255, .2) 50%, transparent 70%);
  background-size: 19em 100%;
  background-repeat: no-repeat;
  pointer-events: all;
}

@keyframes shudan-busy {
  from {
    background-position: -19em 0;
  }
  to {
    background-position: calc(100% + 19em) 0;
  }
}

/* Board grid */

.shudan-gridline, .shudan-hoshi {
  fill: var(--shudan-board-foreground-color);
}

/* Stone render */

.shudan-vertex .shudan-stone {
    top: .04em;
    left: .04em;
    width: calc(100% - .08em);
    height: calc(100% - .08em);
  }
  .shudan-vertex.shudan-sign_0 .shudan-stone {
    pointer-events: none;
  }
  .shudan-vertex .shudan-shadow {
    border-radius: 50%;
  }
  .shudan-vertex .shudan-inner {
    text-indent: -9999rem;
  }
  .shudan-vertex:not(.shudan-sign_0).shudan-dimmed .shudan-stone {
    opacity: .6;
  }
  .shudan-vertex:not(.shudan-sign_0) .shudan-shadow {
    background: rgba(23, 10, 2, .4);
    box-shadow: 0 .1em .2em rgba(23, 10, 2, .4);
  }
  .shudan-stone-image {
    background-repeat: no-repeat;
    background-size: 100% 100%;
  }
  .shudan-stone-image.shudan-sign_1 {
    background-image: url('./stone_1.svg');
  }
  .shudan-stone-image.shudan-sign_-1 {
    background-image: url('./stone_-1.svg');
}

/* Fuzzy stone placement */

.shudan-vertex:not(.shudan-sign_0).shudan-animate .shudan-stone {
    transition: transform .2s;
  }
  .shudan-vertex:not(.shudan-sign_0).shudan-shift_1 .shudan-stone {
    transform: translate(-.07em, 0);
  }
  .shudan-vertex:not(.shudan-sign_0).shudan-shift_2 .shudan-stone {
    transform: translate(0, -.07em);
  }
  .shudan-vertex:not(.shudan-sign_0).shudan-shift_3 .shudan-stone {
    transform: translate(.07em, 0);
  }
  .shudan-vertex:not(.shudan-sign_0).shudan-shift_4 .shudan-stone {
    transform: translate(0, .07em);
  }
  .shudan-vertex:not(.shudan-sign_0).shudan-shift_5 .shudan-stone {
    transform: translate(-.04em, -.04em);
  }
  .shudan-vertex:not(.shudan-sign_0).shudan-shift_6 .shudan-stone {
    transform: translate(.04em, -.04em);
  }
  .shudan-vertex:not(.shudan-sign_0).shudan-shift_7 .shudan-stone {
    transform: translate(.04em, .04em);
  }
  .shudan-vertex:not(.shudan-sign_0).shudan-shift_8 .shudan-stone {
    transform: translate(-.04em, .04em);
}

/* Markers */

.shudan-vertex .shudan-marker {
    left: .04em;
    top: .04em;
    width: calc(100% - .08em);
    height: calc(100% - .08em);
    text-align: center;
    fill: var(--shudan-board-background-color);
    stroke: var(--shudan-board-foreground-color);
    stroke-width: .07em;
    pointer-events: none;
  }
  .shudan-vertex.shudan-sign_1 .shudan-marker,
  .shudan-vertex.shudan-sign_-1 .shudan-marker {
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    fill: none;
  }
  .shudan-vertex.shudan-sign_1 .shudan-marker {
    stroke: var(--shudan-black-foreground-color);
  }
  .shudan-vertex.shudan-sign_-1 .shudan-marker {
    stroke: var(--shudan-white-foreground-color);
}

.shudan-vertex.shudan-marker_point .shudan-marker {
    stroke: none;
    fill: var(--shudan-board-foreground-color);
  }
  .shudan-vertex.shudan-marker_point.shudan-sign_1 .shudan-marker {
    fill: var(--shudan-black-foreground-color);
  }
  .shudan-vertex.shudan-marker_point.shudan-sign_-1 .shudan-marker {
    fill: var(--shudan-white-foreground-color);
}

.shudan-vertex.shudan-marker_loader .shudan-marker {
  stroke-dasharray: 1em;
  animation: 1.5s linear 0s shudan-rotation infinite;
}

@keyframes shudan-rotation {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.shudan-vertex.shudan-marker_label .shudan-marker {
    display: inline-block;
    width: auto;
    height: auto;
    left: 50%;
    top: 50%;
    max-width: 1.67em;
    max-height: 1.67em;
    overflow: hidden;
    background: var(--shudan-board-background-color);
    color: var(--shudan-board-foreground-color);
    font-size: .6em;
    line-height: 1.26;
    text-align: center;
    text-overflow: ellipsis;
    white-space: pre;
    transform: translate(-50%, -50%);
  }
  .shudan-vertex.shudan-marker_label.shudan-sign_1 .shudan-marker {
    background: transparent;
    color: var(--shudan-black-foreground-color);
  }
  .shudan-vertex.shudan-marker_label.shudan-sign_-1 .shudan-marker {
    background: transparent;
    color: var(--shudan-white-foreground-color);
  }
  .shudan-vertex.shudan-smalllabel .shudan-marker {
    max-height: 2.7em;
    max-width: 2.7em;
    font-size: .36em;
}

/* Ghost stones */

.shudan-vertex .shudan-ghost {
    left: 50%;
    top: 50%;
    width: .4em;
    height: .4em;
    opacity: .5;
    transform: translate(calc(-50% + .5px), calc(-50% + .5px));
  }
  .shudan-vertex .shudan-ghost::before {
    content: '';
    box-sizing: border-box;
    display: none;
    position: absolute;
    left: 50%;
    top: 50%;
    width: .4em;
    height: .4em;
    border-radius: 50%;
    transform: translate(-50%, -50%);
  }
  .shudan-vertex.shudan-ghost_faint .shudan-ghost {
    opacity: .3;
  }
  .shudan-vertex.shudan-sign_0.shudan-ghost_1 .shudan-ghost::before,
  .shudan-vertex.shudan-sign_0.shudan-ghost_-1 .shudan-ghost::before {
    display: block;
  }
  .shudan-vertex.shudan-ghost_1 .shudan-ghost::before {
    background: rgba(0, 0, 0, .8);
  }
  .shudan-vertex.shudan-ghost_-1 .shudan-ghost::before {
    background: white;
  }
  .shudan-vertex.shudan-ghost_good .shudan-ghost::before {
    background: #59A80F;
  }
  .shudan-vertex.shudan-ghost_interesting .shudan-ghost::before {
    background: #4886D5;
  }
  .shudan-vertex.shudan-ghost_doubtful .shudan-ghost::before {
    background: #92278F;
  }
  .shudan-vertex.shudan-ghost_bad .shudan-ghost::before {
    background: #F02311;
}

/* Paint map */

.shudan-vertex .shudan-paint {
    overflow: hidden;
  }
  .shudan-vertex .shudan-paint .shudan-inner {
    background: transparent;
    border-radius: .2em;
  }
  .shudan-vertex.shudan-paint_1 .shudan-paint .shudan-inner {
    background: var(--shudan-black-background-color);
  }
  .shudan-vertex.shudan-paint_-1 .shudan-paint .shudan-inner {
    background: var(--shudan-white-background-color);
  }
  .shudan-vertex.shudan-paintedleft .shudan-paint .shudan-inner {
    border-left: none;
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
  }
  .shudan-vertex.shudan-paintedright .shudan-paint .shudan-inner {
    border-right: none;
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
  }
  .shudan-vertex.shudan-paintedtop .shudan-paint .shudan-inner {
    border-top: none;
    border-top-left-radius: 0;
    border-top-right-radius: 0;
  }
  .shudan-vertex.shudan-paintedbottom .shudan-paint .shudan-inner {
    border-bottom: none;
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
}

/* Heat map */

.shudan-vertex .shudan-heat {
    top: 50%;
    left: 50%;
    margin-left: -1px;
    margin-top: -1px;
    border-radius: 50%;
    width: 1px;
    height: 1px;
    opacity: 0;
    pointer-events: none;
    transition: opacity .5s, box-shadow .5s;
  }
  .shudan-vertex.shudan-heat_9 .shudan-heat {
    background: #59A80F;
    box-shadow: 0 0 1em 1em #59A80F;
    opacity: .8;
  }
  .shudan-vertex.shudan-heat_8 .shudan-heat {
    background: #59A80F;
    box-shadow: 0 0 1em .9em #59A80F;
    opacity: .7;
  }
  .shudan-vertex.shudan-heat_7 .shudan-heat {
    background: #4886D5;
    box-shadow: 0 0 1em .75em #4886D5;
    opacity: .8;
  }
  .shudan-vertex.shudan-heat_6 .shudan-heat {
    background: #4886D5;
    box-shadow: 0 0 1em .6em #4886D5;
    opacity: .8;
  }
  .shudan-vertex.shudan-heat_5 .shudan-heat {
    background: #4886D5;
    box-shadow: 0 0 .9em .55em #4886D5;
    opacity: .7;
  }
  .shudan-vertex.shudan-heat_4 .shudan-heat {
    background: #92278F;
    box-shadow: 0 0 .85em .5em #92278F;
    opacity: .8;
  }
  .shudan-vertex.shudan-heat_3 .shudan-heat {
    background: #92278F;
    box-shadow: 0 0 .8em .45em #92278F;
    opacity: .7;
  }
  .shudan-vertex.shudan-heat_2 .shudan-heat {
    background: #F02311;
    box-shadow: 0 0 .75em .4em #F02311;
    opacity: .8;
  }
  .shudan-vertex.shudan-heat_1 .shudan-heat {
    background: #F02311;
    box-shadow: 0 0 .75em .4em #F02311;
    opacity: .7;
}

.shudan-vertex .shudan-heatlabel {
  display: inline-block;
  height: auto;
  top: 50%;
  left: 50%;
  overflow: hidden;
  color: white;
  font-size: .36em;
  line-height: 1.26;
  text-align: center;
  text-overflow: ellipsis;
  text-shadow: 0 .1em .3em black;
  white-space: pre;
  opacity: .9;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

/* Selection */

.shudan-vertex .shudan-selection {
    box-sizing: border-box;
    border: .1em solid #0082F0;
    border-radius: .2em;
    background: rgba(0, 130, 240, .2);
  }
  .shudan-vertex.shudan-selectedleft .shudan-selection {
    border-left: none;
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
  }
  .shudan-vertex.shudan-selectedright .shudan-selection {
    border-right: none;
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
  }
  .shudan-vertex.shudan-selectedtop .shudan-selection {
    border-top: none;
    border-top-left-radius: 0;
    border-top-right-radius: 0;
  }
  .shudan-vertex.shudan-selectedbottom .shudan-selection {
    border-bottom: none;
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
}

/* Lines & arrows */

.shudan-line,
.shudan-arrow {
  fill: none;
  stroke: var(--shudan-board-foreground-color);
  stroke-width: .11em;
}