:root {
  font-family: system-ui, "Microsoft YaHei", sans-serif;
  color: #203a30;
  background: #f2f4ef;
  line-height: 1.55;
  --green: #196344;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
}
main {
  max-width: 1220px;
  margin: auto;
  padding: 30px 28px;
}
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 26px;
}
h1 {
  font-size: 27px;
  letter-spacing: -0.5px;
  margin: 4px 0;
}
h2 {
  font-size: 16px;
  margin: 0 0 16px;
}
p {
  margin: 5px 0;
}
.eyebrow {
  font-size: 11px;
  letter-spacing: 2px;
  color: #698273;
}
header p {
  color: #64776e;
  font-size: 14px;
}
.badge {
  border: 1px solid #d1ddd4;
  border-radius: 20px;
  padding: 8px 14px;
  font-size: 12px;
  white-space: nowrap;
  background: #fff;
}
.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 24px;
  align-items: start;
}
.play-panel {
  position: sticky;
  top: 18px;
  min-width: 0;
  background: #fff;
  border: 1px solid #dce3da;
  border-radius: 18px;
  padding: 20px;
}
.board-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  gap: 10px;
}
.board-heading strong {
  font-size: 17px;
}
button,
input,
select {
  font: inherit;
  -webkit-tap-highlight-color: transparent;
}
button {
  cursor: pointer;
  border: 0;
  border-radius: 9px;
  background: var(--green);
  color: white;
  padding: 10px 18px;
  font-size: 14px;
  min-height: 42px;
}
button:disabled {
  opacity: 0.5;
  cursor: default;
}
button:hover:not(:disabled) {
  filter: brightness(0.96);
}
button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 3px solid #52a27c;
  outline-offset: 2px;
}
.secondary {
  background: #eaf0e9;
  color: #274b38;
}
.subtle {
  background: transparent;
  color: #37644e;
  padding: 5px 8px;
}
.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 17px;
}
#board-scroll {
  --rows: 15;
  --cols: 15;
  --board-pad: 8px;
  width: min(100%, calc((min(72vh, 900px) - 3px - 2 * var(--board-pad)) * var(--cols) / var(--rows) + 2 * var(--board-pad) + 2px));
  margin-inline: auto;
  overflow: auto;
  border-radius: 8px;
  border: 1px solid #bc9c71;
  background: #dfbd8c;
  overscroll-behavior: contain;
  max-height: min(72vh, 900px);
}
#board-scroll.zoomed {
  width: 100%;
}
#board {
  display: grid;
  grid-template-columns: repeat(var(--cols), minmax(0, 1fr));
  width: 100%;
  margin-inline: auto;
  padding: var(--board-pad);
  background: #efd3a8;
  gap: 0;
}
#board.zoomed {
  width: max(100%, calc(var(--cols) * 44px + 2 * var(--board-pad)));
}
.cell {
  position: relative;
  min-width: 0;
  min-height: 0;
  padding: 0;
  aspect-ratio: 1;
  border-radius: 0;
  background: var(--heat, #f4dab3);
  border: 0;
  color: #293d33;
  touch-action: manipulation;
}
.cell::before,
.cell::after {
  content: "";
  position: absolute;
  pointer-events: none;
}
.cell::before {
  height: 1px;
  width: 100%;
  background: #896c4d88;
  left: 0;
  top: 50%;
}
.cell::after {
  width: 1px;
  height: 100%;
  background: #896c4d88;
  left: 50%;
  top: 0;
}
.star-point {
  position: absolute;
  z-index: 1;
  pointer-events: none;
  width: clamp(4px, 16%, 8px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: #61482f;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
.stone {
  position: absolute;
  z-index: 2;
  border-radius: 50%;
  inset: 8%;
  box-shadow: 0 1px 3px #0005;
}
.stone.black {
  background: radial-gradient(circle at 32% 28%, #454945, #111612 65%);
}
.stone.white {
  background: radial-gradient(circle at 30% 25%, #fff, #e5e8e1);
  border: 1px solid #8f978a;
}
.stone.last {
  outline: 2px solid #d27d30;
  outline-offset: 1px;
}
.cell.forbidden {
  background: #b6b9b3;
}
.cell.forbidden::before {
  transform: rotate(45deg);
  width: 45%;
  left: 28%;
  background: #777e73;
}
.cell.forbidden::after {
  transform: rotate(45deg);
  height: 45%;
  top: 28%;
  background: #777e73;
}
.cell.recommended {
  box-shadow: inset 0 0 0 2px #168253;
}
.legend {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: center;
  color: #627469;
  font-size: 12px;
  margin-top: 14px;
}
.legend span {
  display: flex;
  align-items: center;
  gap: 5px;
}
.legend i {
  width: 12px;
  height: 12px;
  display: inline-block;
  border-radius: 50%;
}
.legend .black {
  background: #232c26;
}
.legend .white {
  background: white;
  border: 1px solid #9dada0;
}
.legend .gray {
  background: #969c91;
  border-radius: 2px;
}
#message {
  font-size: 14px;
  min-height: 44px;
  margin-top: 14px;
  color: #43624f;
}
aside {
  display: grid;
  gap: 16px;
}
.card {
  border: 1px solid #dce3da;
  border-radius: 14px;
  background: #fff;
  padding: 20px;
}
.card label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  margin: 14px 0;
}
.field {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: #687e6e;
}
input[type="number"] {
  width: 72px;
}
input,
select {
  max-width: 175px;
  border: 1px solid #d2ddd1;
  background: #fafcf8;
  border-radius: 7px;
  padding: 8px;
  color: #2c4736;
  font-size: 13px;
}
.presets {
  display: flex;
  gap: 5px;
}
.presets button {
  flex: 1;
  min-height: 34px;
  padding: 5px;
  font-size: 12px;
  background: #edf3e9;
  color: #365a41;
}
.hint {
  font-size: 11px;
  color: #7a887b;
  line-height: 1.7;
}
.toggle {
  justify-content: flex-start !important;
}
.toggle input {
  margin: 0;
}
.scale {
  display: flex;
  height: 9px;
  overflow: hidden;
  border-radius: 4px;
  margin: 14px 0 8px;
}
.scale i {
  flex: 1;
}
dl {
  margin: 18px 0 12px;
  font-size: 12px;
}
dl div {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px solid #edf1e9;
  padding: 8px 0;
  gap: 12px;
}
dt {
  color: #72826f;
}
dd {
  margin: 0;
  text-align: right;
}
.compact p {
  font-size: 12px;
  color: #71806d;
  margin: 10px 0;
}
.compact button {
  width: 100%;
  margin-top: 8px;
}
footer {
  text-align: center;
  font-size: 11px;
  color: #82907e;
  margin-top: 26px;
}
@media (max-width: 850px) {
  main {
    padding: 20px 16px;
  }
  .layout {
    grid-template-columns: 1fr;
  }
  .play-panel {
    position: static;
  }
  aside {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .compact {
    grid-column: 1/-1;
  }
}
@media (max-width: 520px) {
  main {
    padding: 16px 10px;
  }
  header {
    align-items: flex-start;
    margin-bottom: 18px;
  }
  h1 {
    font-size: 21px;
  }
  .badge {
    font-size: 10px;
    padding: 6px 9px;
    max-width: 122px;
    white-space: normal;
    text-align: center;
  }
  .eyebrow {
    font-size: 9px;
  }
  .play-panel {
    padding: 12px;
    border-radius: 12px;
  }
  .board-heading {
    margin-bottom: 10px;
  }
  #board-scroll {
    --board-pad: 5px;
  }
  aside {
    grid-template-columns: 1fr;
  }
  .card {
    padding: 17px;
  }
  .legend {
    gap: 11px;
  }
  .actions button {
    flex: 1;
    padding: 9px 12px;
  }
  header p {
    font-size: 12px;
  }
  .stone.last {
    outline-width: 1px;
  }
  .cell.recommended {
    box-shadow: inset 0 0 0 1px #168253;
  }
}