.play-shell {
  background:
    linear-gradient(135deg, rgba(63, 180, 214, 0.12), transparent 38%),
    linear-gradient(225deg, rgba(81, 214, 182, 0.12), transparent 42%),
    var(--bg);
}

.play-stage {
  display: grid;
  gap: 20px;
  margin: 0 auto;
  max-width: 1120px;
  padding: 32px clamp(14px, 4vw, 28px) 72px;
}

.play-header {
  display: grid;
  gap: 14px;
  max-width: 820px;
}

.play-header h1 {
  font-size: clamp(42px, 8vw, 88px);
}

.play-toolbar {
  align-items: end;
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(180px, 1fr) repeat(2, auto);
}

.play-field {
  display: grid;
  gap: 7px;
}

.play-field label,
.panel-title {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.play-field select,
.play-button {
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
  min-height: 44px;
}

.play-field select {
  appearance: none;
  background: #eef6ff;
  color: #0b1622;
  padding: 0 38px 0 14px;
}

.play-button {
  background: #eef6ff;
  color: #0b1622;
  cursor: pointer;
  font-weight: 850;
  padding: 0 14px;
}

.play-button.primary {
  background: linear-gradient(135deg, var(--teal), var(--mint));
  border-color: rgba(63, 180, 214, 0.72);
}

.play-button:hover,
.disk-cell.legal:hover {
  transform: translateY(-1px);
}

.game-layout {
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(280px, 0.95fr) minmax(250px, 0.48fr);
}

.board-panel,
.side-panel {
  background: rgba(15, 22, 34, 0.94);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.24);
}

.board-panel {
  display: grid;
  gap: 16px;
  padding: clamp(14px, 3vw, 22px);
}

.board-strip {
  align-items: center;
  display: flex;
  gap: 12px;
  justify-content: space-between;
  flex-wrap: wrap;
}

#level-title {
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  margin: 0;
}

.scoreboard {
  display: flex;
  gap: 10px;
}

.score {
  align-items: center;
  background: rgba(238, 246, 255, 0.06);
  border: 1px solid var(--line);
  border-radius: 999px;
  display: flex;
  gap: 8px;
  padding: 4px 12px 4px 4px;
}

.score .pip {
  border-radius: 50%;
  height: 22px;
  width: 22px;
}

.score.player .pip {
  background: radial-gradient(circle at 32% 30%, #ffffff, #d7e6f5 64%, #b6c9dd);
}

.score.opponent .pip {
  background: radial-gradient(circle at 32% 30%, #3c4a5e, #1a2433 70%, #0d141f);
}

.score strong {
  font-size: 1.1rem;
  min-width: 1.3ch;
  text-align: right;
}

#status {
  background: rgba(238, 246, 255, 0.08);
  border: 1px solid rgba(63, 180, 214, 0.22);
  border-radius: 8px;
  color: var(--muted);
  margin: 0;
  min-height: 42px;
  padding: 10px 12px;
}

#disk-board {
  --board-size: 8;
  aspect-ratio: 1 / 1;
  background: rgba(31, 56, 47, 0.55);
  border: 1px solid rgba(81, 214, 182, 0.22);
  border-radius: 10px;
  display: grid;
  gap: clamp(3px, 1vw, 7px);
  grid-template-columns: repeat(var(--board-size), minmax(0, 1fr));
  grid-template-rows: repeat(var(--board-size), minmax(0, 1fr));
  margin: 0 auto;
  max-width: min(620px, 100%);
  padding: clamp(5px, 1.4vw, 10px);
  width: 100%;
}

.disk-cell {
  align-items: center;
  background: rgba(63, 180, 214, 0.08);
  border: 1px solid rgba(238, 246, 255, 0.08);
  border-radius: 6px;
  display: grid;
  justify-items: center;
  min-width: 0;
  padding: 0;
  position: relative;
}

button.disk-cell {
  appearance: none;
  cursor: pointer;
  font: inherit;
}

.disk-cell.legal {
  background: rgba(81, 214, 182, 0.16);
  border-color: rgba(81, 214, 182, 0.5);
}

.hint-dot {
  background: rgba(81, 214, 182, 0.7);
  border-radius: 50%;
  height: 26%;
  width: 26%;
}

.disk {
  border-radius: 50%;
  height: 78%;
  width: 78%;
}

.disk.player {
  background: radial-gradient(circle at 32% 30%, #ffffff, #d7e6f5 64%, #b6c9dd);
  box-shadow: inset 0 -2px 5px rgba(0, 0, 0, 0.28), 0 2px 4px rgba(0, 0, 0, 0.3);
}

.disk.opponent {
  background: radial-gradient(circle at 32% 30%, #3c4a5e, #1a2433 70%, #0d141f);
  box-shadow: inset 0 2px 5px rgba(255, 255, 255, 0.14), 0 2px 4px rgba(0, 0, 0, 0.3);
}

.disk.just-flipped {
  outline: 2px solid rgba(255, 207, 98, 0.85);
  outline-offset: 1px;
}

#disk-board[data-result="playerWin"] {
  border-color: rgba(81, 214, 182, 0.6);
}

#disk-board[data-result="opponentWin"] {
  border-color: rgba(240, 121, 90, 0.6);
}

.side-panel {
  align-content: start;
  display: grid;
  gap: 18px;
  padding: 16px;
}

#move-list {
  display: grid;
  gap: 8px;
  list-style: none;
  margin: 0;
  max-height: 320px;
  overflow-y: auto;
  padding: 0;
}

#move-list li {
  align-items: center;
  background: rgba(238, 246, 255, 0.06);
  border: 1px solid rgba(63, 180, 214, 0.16);
  border-radius: 8px;
  color: var(--muted);
  display: flex;
  gap: 10px;
  justify-content: space-between;
  min-height: 38px;
  padding: 6px 10px;
}

#move-list li strong {
  color: var(--mint);
}

.how-to {
  display: grid;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.how-to li {
  border-left: 3px solid var(--teal);
  color: var(--muted);
  font-size: 0.9rem;
  padding: 4px 0 4px 12px;
}

@media (max-width: 860px) {
  .play-toolbar,
  .game-layout {
    grid-template-columns: 1fr;
  }

  .play-button {
    width: 100%;
  }
}

@media (max-width: 520px) {
  .play-stage {
    padding-top: 20px;
  }

  .board-panel,
  .side-panel {
    padding: 12px;
  }

  .board-strip {
    align-items: flex-start;
    flex-direction: column;
  }
}