.game-screen {
  width: 100%;
  align-self: stretch;
}

.game-header {
  min-height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 12px !important;
  border-bottom: 1px solid var(--line);
}

.brand--compact .brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 12px;
}

.game-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-button {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--ink);
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  transition: color 150ms ease, border-color 150ms ease, background 150ms ease, transform 150ms ease;
}

.icon-button:hover {
  color: var(--blue);
  border-color: var(--blue);
  background: var(--color-secondary-soft);
  transform: translateY(-1px);
}

.icon-button svg {
  width: 20px;
  height: 20px;
}

.match-bar {
  width: min(700px, 100%);
  display: grid;
  grid-template-columns: minmax(170px, 1fr) minmax(150px, auto) minmax(170px, 1fr);
  align-items: stretch;
  gap: 10px;
  margin: 14px auto 10px;
}

.player-card,
.turn-status {
  min-height: 62px;
  display: flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: color-mix(in srgb, var(--paper) 82%, transparent);
}

.player-card {
  gap: 10px;
  padding: 8px 11px;
  opacity: 0.62;
  transition: opacity 160ms ease, border-color 160ms ease, background 160ms ease, transform 160ms ease;
}

.player-card--white {
  justify-content: flex-end;
  text-align: right;
}

.player-card.is-active {
  opacity: 1;
  border-color: color-mix(in srgb, var(--player-color) 58%, transparent);
  background: color-mix(in srgb, var(--player-color) 8%, var(--paper));
  transform: translateY(-1px);
}

.player-card--black {
  --player-color: var(--ink);
}

.player-card--white {
  --player-color: var(--blue);
}

.score-disc {
  width: 28px;
  aspect-ratio: 1;
  flex: none;
  border-radius: 50%;
}

.score-disc--black {
  background: var(--ink);
  box-shadow: inset 0 0 0 2px color-mix(in srgb, white 12%, transparent);
}

.score-disc--white {
  border: 2px solid var(--ink);
  background: var(--paper-raised);
}

.player-card span,
.player-card small,
.player-card strong {
  display: block;
}

.player-card small {
  color: var(--ink-muted);
  font-size: 0.56rem;
  font-weight: 850;
  letter-spacing: 0.11em;
}

.player-card strong {
  margin-top: 1px;
  font-size: 0.75rem;
}

.player-card b {
  margin-left: auto;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.8rem;
  font-weight: 500;
}

.player-card--white b {
  margin-right: auto;
  margin-left: 0;
}

.turn-status {
  min-width: 150px;
  flex-direction: column;
  justify-content: center;
  position: relative;
  padding: 8px 16px;
  text-align: center;
}

.turn-status__dot {
  position: absolute;
  top: 8px;
  left: 9px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ink);
}

.turn-status.is-white .turn-status__dot {
  border: 1px solid var(--ink);
  background: var(--paper-raised);
}

.turn-status.is-thinking .turn-status__dot {
  animation: pulse 900ms ease-in-out infinite;
}

.turn-status strong {
  font-size: 0.75rem;
}

.turn-status small {
  margin-top: 3px;
  color: var(--ink-muted);
  font-size: 0.58rem;
}

.board-stage {
  width: min(600px, 100%);
  margin: 0 auto;
  padding: 10px 14px 14px 10px;
  border: 1px solid var(--line);
  border-radius: clamp(20px, 3vw, 28px);
  background: color-mix(in srgb, var(--paper-raised) 87%, transparent);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(8px);
}

.board-row {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 4px;
}

.board-coordinates {
  color: var(--ink-muted);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.56rem;
  font-weight: 700;
}

.board-coordinates--top {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  margin: 0 0 4px 22px;
  text-align: center;
}

.board-coordinates--side {
  display: grid;
  grid-template-rows: repeat(8, 1fr);
  align-items: center;
  text-align: center;
}

.reversi-board {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  width: 100%;
  aspect-ratio: 1;
  overflow: hidden;
  border: 4px solid var(--ink);
  border-radius: 17px;
  background: color-mix(in srgb, var(--lime) 62%, var(--color-canvas));
  box-shadow:
    inset 0 0 0 1px color-mix(in srgb, white 35%, transparent),
    0 14px 30px color-mix(in srgb, var(--ink) 17%, transparent);
  touch-action: manipulation;
}

.board-cell {
  position: relative;
  min-width: 0;
  min-height: 0;
  display: grid;
  place-items: center;
  padding: 9%;
  border: 0;
  border-right: 1px solid color-mix(in srgb, var(--ink) 24%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--ink) 24%, transparent);
  border-radius: 0;
  color: var(--ink);
  background: transparent;
}

.board-cell:nth-child(8n) {
  border-right: 0;
}

.board-cell:nth-last-child(-n + 8) {
  border-bottom: 0;
}

.board-cell:not(:disabled) {
  cursor: pointer;
}

.board-cell:not(:disabled):hover {
  background: color-mix(in srgb, white 22%, transparent);
}

.board-cell:focus-visible {
  z-index: 3;
  outline: 3px solid var(--blue);
  outline-offset: -4px;
}

.move-marker {
  width: 24%;
  aspect-ratio: 1;
  border: 2px solid color-mix(in srgb, var(--blue) 85%, var(--ink));
  border-radius: 50%;
  background: color-mix(in srgb, var(--blue) 15%, transparent);
  box-shadow: 0 0 0 3px color-mix(in srgb, white 22%, transparent);
  transition: transform 120ms ease, background 120ms ease;
}

.board-cell:not(:disabled):hover .move-marker,
.board-cell:focus-visible .move-marker {
  background: var(--blue);
  transform: scale(1.25);
}

.disc {
  width: 84%;
  aspect-ratio: 1;
  display: block;
  border-radius: 50%;
  transform-origin: center;
}

.disc--black {
  border: 2px solid color-mix(in srgb, white 12%, var(--ink));
  background:
    radial-gradient(circle at 36% 28%, color-mix(in srgb, white 20%, var(--ink)), var(--ink) 58%);
  box-shadow:
    inset -4px -5px 9px color-mix(in srgb, black 26%, transparent),
    0 5px 8px color-mix(in srgb, var(--ink) 27%, transparent);
}

.disc--white {
  border: 2px solid color-mix(in srgb, var(--ink) 62%, transparent);
  background:
    radial-gradient(circle at 35% 28%, white, color-mix(in srgb, var(--color-canvas) 74%, var(--blue)) 88%);
  box-shadow:
    inset -4px -5px 9px color-mix(in srgb, var(--blue) 13%, transparent),
    0 5px 8px color-mix(in srgb, var(--ink) 19%, transparent);
}

.board-cell.is-last::after {
  content: "";
  position: absolute;
  width: 12%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 0 0 2px color-mix(in srgb, white 64%, transparent);
}

.disc.is-new {
  animation: flip-disc 380ms cubic-bezier(0.2, 0.78, 0.3, 1.15) both;
}

.reversi-board.is-locked .board-cell:not(:disabled) {
  cursor: wait;
}

.game-footer {
  width: min(600px, 100%);
  min-height: 38px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin: 7px auto 0;
}

.game-footer p {
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.68rem;
}

.text-button {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 8px;
  border: 0;
  color: var(--ink-muted);
  background: transparent;
  font-size: 0.7rem;
  font-weight: 800;
}

.text-button:hover {
  color: var(--coral);
}

.text-button svg {
  width: 17px;
  height: 17px;
}

@keyframes flip-disc {
  0% { opacity: 0.35; transform: perspective(300px) rotateY(90deg) scale(0.78); }
  100% { opacity: 1; transform: perspective(300px) rotateY(0) scale(1); }
}

@keyframes pulse {
  0%, 100% { opacity: 0.35; transform: scale(0.75); }
  50% { opacity: 1; transform: scale(1.15); }
}