.play-shell {
  background:
    linear-gradient(135deg, rgba(255, 207, 98, 0.12), transparent 38%),
    linear-gradient(225deg, rgba(93, 214, 200, 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) auto repeat(3, 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: #f7fff1;
  color: #101716;
  padding: 0 38px 0 14px;
}

.play-button {
  background: #f7fff1;
  color: #101716;
  cursor: pointer;
  font-weight: 850;
  padding: 0 14px;
}

.play-button.primary {
  background: linear-gradient(135deg, var(--amber), var(--grass));
  border-color: rgba(255, 207, 98, 0.72);
}

.play-button:hover:not(:disabled),
.nim-pile:hover:not(:disabled),
.pile-button:hover:not(:disabled) {
  transform: translateY(-1px);
}

.play-field input[type="number"] {
  appearance: textfield;
  background: #f7fff1;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: #101716;
  font: inherit;
  min-height: 44px;
  padding: 0 12px;
  width: 88px;
}

.play-button:disabled,
.nim-pile:disabled,
.pile-button:disabled {
  cursor: default;
  opacity: 0.55;
}

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

.board-panel,
.side-panel {
  background: rgba(23, 35, 31, 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;
}

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

#status {
  background: rgba(247, 255, 241, 0.08);
  border: 1px solid rgba(93, 214, 200, 0.22);
  border-radius: 8px;
  color: var(--muted);
  margin: 0;
  min-height: 42px;
  padding: 10px 12px;
}

#nim-board {
  display: grid;
  gap: clamp(10px, 2vw, 16px);
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  margin: 0 auto;
  max-width: min(680px, 100%);
  width: 100%;
}

.nim-pile {
  align-content: end;
  appearance: none;
  background: rgba(247, 255, 241, 0.06);
  border: 1px solid rgba(247, 255, 241, 0.16);
  border-radius: 10px;
  color: var(--ink);
  cursor: pointer;
  display: grid;
  gap: 8px;
  justify-items: center;
  min-height: 180px;
  padding: 14px 10px 12px;
  position: relative;
}

.nim-pile:focus-visible {
  outline: 2px solid var(--pile-color);
  outline-offset: 2px;
}

.pile-count {
  color: var(--pile-color);
  font-size: clamp(1.6rem, 5vw, 2.3rem);
  font-weight: 950;
  line-height: 1;
}

.pile-sticks {
  align-items: flex-end;
  display: flex;
  flex-wrap: wrap-reverse;
  gap: 4px;
  justify-content: center;
  min-height: 92px;
}

.stick {
  background: var(--pile-color);
  border-radius: 3px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
  display: block;
  height: clamp(46px, 11vw, 84px);
  width: 7px;
}

.stick::after {
  background: #f06d55;
  border-radius: 50%;
  content: "";
  display: block;
  height: 9px;
  margin: -4px 0 0 -1px;
  width: 9px;
}

.pile-tag {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

#nim-board[data-over="true"] .nim-pile {
  border-color: rgba(165, 232, 109, 0.34);
}

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

#pile-list,
#move-list {
  display: grid;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

#pile-list li,
#move-list li {
  align-items: center;
  background: rgba(247, 255, 241, 0.08);
  border: 1px solid rgba(93, 214, 200, 0.16);
  border-radius: 8px;
  color: var(--muted);
  display: flex;
  gap: 10px;
  justify-content: space-between;
  min-height: 42px;
  padding: 8px 10px;
}

.pile-button {
  background: rgba(247, 255, 241, 0.94);
  border: 0;
  border-radius: 8px;
  color: #101716;
  cursor: pointer;
  font: inherit;
  font-size: 0.82rem;
  font-weight: 900;
  min-height: 32px;
  padding: 0 10px;
}

@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;
  }
}