.board {
  container-type: inline-size;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  width: 100%;
  max-width: var(--board-max);
  margin-inline: auto;
  aspect-ratio: 1;
  overflow: hidden;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  user-select: none;
}

.square {
  --tone: var(--board-light);
  --coord: var(--coord-on-light);
  position: relative;
  display: grid;
  place-items: center;
  min-width: 0;
  min-height: 0;
  background-color: var(--tone);
  background-image: var(--hover, none), var(--tint, none), var(--mark, none);
}

.square[data-tone="dark"] {
  --tone: var(--board-dark);
  --coord: var(--coord-on-dark);
}

.square[data-file]::after {
  content: attr(data-file);
  position: absolute;
  right: 5%;
  bottom: 3%;
  color: var(--coord);
  font-size: 2.2cqw;
  font-weight: 700;
  line-height: 1;
}

.square[data-rank]::before {
  content: attr(data-rank);
  position: absolute;
  top: 4%;
  left: 5%;
  color: var(--coord);
  font-size: 2.2cqw;
  font-weight: 700;
  line-height: 1;
}

.square.is-last-move {
  --tint: linear-gradient(var(--board-last-move), var(--board-last-move));
}

.square.is-selected {
  --tint: linear-gradient(var(--board-selected), var(--board-selected));
}

.square.is-target {
  --mark: radial-gradient(circle, var(--board-target) 0 19%, transparent 20%);
  cursor: pointer;
}

.square.is-capture {
  --mark: radial-gradient(circle, transparent 0 54%, var(--board-target) 55% 68%, transparent 69%);
  cursor: pointer;
}

.square.is-check {
  --mark: radial-gradient(circle, var(--board-check) 0, rgb(239 68 68 / 0) 72%);
}

.square.is-clickable {
  cursor: pointer;
}

.square.is-clickable:hover {
  --hover: linear-gradient(rgb(255 255 255 / 0.3), rgb(255 255 255 / 0.3));
}

.square.is-drop {
  box-shadow: inset 0 0 0 0.7cqw var(--accent);
}

.square:focus-visible {
  outline: 0.7cqw solid var(--accent);
  outline-offset: -0.7cqw;
}

.piece.is-draggable {
  cursor: grab;
}

.piece.is-dragging {
  cursor: grabbing;
  filter: drop-shadow(0 1cqw 1cqw rgb(0 0 0 / 0.4));
  opacity: 0.85;
  transform: scale(1.14);
}

.piece,
.piece-icon {
  --glyph: "";
  font-family: var(--font-pieces);
  line-height: 1;
  color: var(--piece-fill);
  -webkit-text-stroke: 0.07em var(--piece-edge);
  paint-order: stroke fill;
}

.piece::before,
.piece-icon::before {
  content: var(--glyph);
}

.piece {
  display: block;
  font-size: 10.4cqw;
  text-shadow: 0 0.04em 0.06em rgb(0 0 0 / 0.3);
}

.piece-icon {
  display: inline-block;
  font-size: 1.6rem;
  vertical-align: middle;
}

:is(.piece, .piece-icon)[data-piece^="w"] {
  --piece-fill: var(--piece-white);
  --piece-edge: var(--piece-white-edge);
}

:is(.piece, .piece-icon)[data-piece^="b"] {
  --piece-fill: var(--piece-black);
  --piece-edge: var(--piece-black-edge);
}

:is(.piece, .piece-icon)[data-piece$="k"] {
  --glyph: "\265A\FE0E";
}

:is(.piece, .piece-icon)[data-piece$="q"] {
  --glyph: "\265B\FE0E";
}

:is(.piece, .piece-icon)[data-piece$="r"] {
  --glyph: "\265C\FE0E";
}

:is(.piece, .piece-icon)[data-piece$="b"] {
  --glyph: "\265D\FE0E";
}

:is(.piece, .piece-icon)[data-piece$="n"] {
  --glyph: "\265E\FE0E";
}

:is(.piece, .piece-icon)[data-piece$="p"] {
  --glyph: "\265F\FE0E";
}

.die {
  --pip-r: calc(var(--die-size, 72px) * 0.085);
  --tl: radial-gradient(circle at 26% 26%, var(--die-pip) var(--pip-r), transparent calc(var(--pip-r) + 0.6px));
  --tr: radial-gradient(circle at 74% 26%, var(--die-pip) var(--pip-r), transparent calc(var(--pip-r) + 0.6px));
  --ml: radial-gradient(circle at 26% 50%, var(--die-pip) var(--pip-r), transparent calc(var(--pip-r) + 0.6px));
  --mc: radial-gradient(circle at 50% 50%, var(--die-pip) var(--pip-r), transparent calc(var(--pip-r) + 0.6px));
  --mr: radial-gradient(circle at 74% 50%, var(--die-pip) var(--pip-r), transparent calc(var(--pip-r) + 0.6px));
  --bl: radial-gradient(circle at 26% 74%, var(--die-pip) var(--pip-r), transparent calc(var(--pip-r) + 0.6px));
  --br: radial-gradient(circle at 74% 74%, var(--die-pip) var(--pip-r), transparent calc(var(--pip-r) + 0.6px));
  display: block;
  flex: none;
  width: var(--die-size, 72px);
  height: var(--die-size, 72px);
  padding: 0;
  background-color: var(--die-face);
  background-repeat: no-repeat;
  border: 2px solid var(--die-edge);
  border-radius: 20%;
  box-shadow: var(--die-shadow);
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
}

button.die {
  cursor: pointer;
}

button.die:hover:not(:disabled) {
  transform: translateY(-2px);
}

.die[data-value="1"] {
  background-image: var(--mc);
}

.die[data-value="2"] {
  background-image: var(--tl), var(--br);
}

.die[data-value="3"] {
  background-image: var(--tl), var(--mc), var(--br);
}

.die[data-value="4"] {
  background-image: var(--tl), var(--tr), var(--bl), var(--br);
}

.die[data-value="5"] {
  background-image: var(--tl), var(--tr), var(--mc), var(--bl), var(--br);
}

.die[data-value="6"] {
  background-image: var(--tl), var(--tr), var(--ml), var(--mr), var(--bl), var(--br);
}

.die.is-selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--ring), var(--die-shadow);
  transform: translateY(-4px);
}

.die.is-blocked,
.die:disabled {
  opacity: 0.4;
  filter: grayscale(0.5);
  box-shadow: none;
  cursor: not-allowed;
}

.die.is-rolling {
  animation: die-roll 0.5s ease-in-out infinite;
}

.die-sm {
  --die-size: 24px;
  border-width: 1px;
  box-shadow: none;
}

@keyframes die-roll {
  0% {
    transform: rotate(0deg) scale(1);
  }

  25% {
    transform: rotate(-14deg) translateY(-6px) scale(1.04);
  }

  50% {
    transform: rotate(10deg) translateY(0) scale(1);
  }

  75% {
    transform: rotate(-8deg) translateY(-4px) scale(1.03);
  }

  100% {
    transform: rotate(0deg) scale(1);
  }
}

.dice-tray {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  padding: var(--space-5) var(--space-4);
  background: var(--surface-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.die-slot {
  display: grid;
  justify-items: center;
  gap: var(--space-2);
}

.die-caption {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-size: var(--text-sm);
}

.die-caption .piece-icon {
  font-size: 1.3rem;
}

.player-panel {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.player-panel.is-active {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--ring);
}

.player-info {
  display: grid;
  flex: 1;
  min-width: 0;
}

.player-name {
  overflow: hidden;
  font-weight: 600;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.player-meta {
  color: var(--muted);
  font-size: var(--text-sm);
}

.captured {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
}

.captured .piece-icon {
  margin-right: -0.35em;
  font-size: 1.3rem;
}

.clock {
  padding: 4px 12px;
  background: var(--surface-muted);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

.clock.is-running {
  background: var(--accent);
  color: var(--accent-text);
}

.clock.is-low {
  background: var(--danger);
  color: var(--danger-text);
}

.moves-panel {
  max-height: min(340px, 40vh);
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.moves-title {
  margin: 0;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border);
  font-size: var(--text-base);
}

.move-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.move-row {
  display: grid;
  grid-template-columns: 2.5rem 1fr 1fr;
  align-items: center;
  padding: 4px var(--space-3);
}

.move-row:nth-child(even) {
  background: var(--surface-muted);
}

.move-no {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.move {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 6px;
  border-radius: 6px;
  font-weight: 600;
}

.move.is-current {
  background: var(--accent);
  color: var(--accent-text);
}

.game {
  --board-size: min(var(--board-max), max(18rem, calc(100vh - 16.5rem)));
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: var(--space-5);
  align-items: start;
}

.game.has-dice {
  grid-template-columns: 140px minmax(0, 1fr) 320px;
}

.game-main,
.game-side,
.game-dice {
  display: grid;
  gap: var(--space-4);
  min-width: 0;
}

.game-main {
  width: 100%;
  max-width: var(--board-size);
  margin-inline: auto;
}

.game-dice {
  align-self: center;
}

.game-dice .dice-tray {
  flex-direction: column;
  align-items: center;
  gap: var(--space-5);
  padding: var(--space-4) var(--space-2);
}

.game-main > .board {
  margin-block: calc(var(--space-1) * -1);
}

.game-controls {
  display: flex;
  gap: var(--space-3);
}

.game-controls .btn {
  flex: 1;
}

.promotion {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.promotion-choice {
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  padding: 0;
  background: var(--board-light);
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color 0.15s, transform 0.15s;
}

.promotion-choice:nth-child(even) {
  background: var(--board-dark);
}

.promotion-choice:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.promotion-choice .piece-icon {
  font-size: 3rem;
}

.result {
  display: grid;
  justify-items: center;
  gap: var(--space-2);
  text-align: center;
}

.result-title {
  margin: 0;
  font-size: var(--text-2xl);
  font-weight: 800;
  line-height: 1.2;
}

.result-reason {
  margin: 0 0 var(--space-2);
  color: var(--muted);
}

.result-win .result-title {
  color: var(--success-text);
}

.result-loss .result-title {
  color: var(--error-text);
}

.result-draw .result-title {
  color: var(--warning-text);
}

.game-list {
  display: grid;
  gap: var(--space-3);
}

.game-card {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3) var(--space-4);
  padding: var(--space-4);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.game-card-players {
  display: grid;
  flex: 1 1 200px;
  gap: var(--space-2);
  min-width: 0;
}

.game-card-player {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 600;
}

.game-card-player .piece-icon {
  font-size: 1.1rem;
}

.game-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

@media (max-width: 860px) {
  .game,
  .game.has-dice {
    grid-template-columns: minmax(0, 1fr);
  }

  .game-main {
    max-width: var(--board-max);
  }

  .game-dice {
    order: 2;
    align-self: stretch;
  }

  .game-side {
    order: 3;
  }

  .game-dice .dice-tray {
    flex-direction: row;
    justify-content: center;
    gap: var(--space-6);
    padding: var(--space-5) var(--space-4);
  }
}

@media (max-width: 480px) {
  .dice-tray {
    gap: var(--space-5);
  }

  .clock {
    font-size: var(--text-lg);
  }
}

.square-hit,
.square-form {
  position: absolute;
  inset: 0;
  z-index: 1;
  margin: 0;
}

.square-hit {
  display: block;
  width: 100%;
  height: 100%;
  padding: 0;
  background: transparent;
  border: 0;
  cursor: pointer;
}

.die-form {
  margin: 0;
}

.game-side .dialog {
  position: static;
  width: auto;
  margin: 0;
}

.game-controls form {
  display: contents;
}

.lobby {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: var(--space-5);
  align-items: start;
}

.lobby-main,
.lobby-section {
  display: grid;
  gap: var(--space-4);
  min-width: 0;
}

.lobby-title {
  margin: 0;
  font-size: var(--text-lg);
}

@media (max-width: 860px) {
  .lobby {
    grid-template-columns: minmax(0, 1fr);
  }
}

.player-link {
  color: inherit;
  text-decoration: none;
}

.player-link:hover {
  color: var(--accent);
  text-decoration: underline;
}

.main.main-tight {
  padding-block: var(--space-4);
}