.game-board.playing-board {
  --shiritori-warm-edge: #e4cfa9;
  --shiritori-accent: #b57427;
  align-items: stretch;
  min-height: 0;
}

.game-area.game-shiritori-chain {
  border-radius: 14px;
  background: linear-gradient(180deg, #fffdf7, #fbf7ed);
}

.game-area.game-shiritori-chain {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  gap: 0.55rem;
  width: 100%;
  max-width: 100%;
  min-height: 0;
  padding: 0.15rem 0 0;
  overflow-x: hidden;
}

.shiritori-chain-panel {
  width: 100%;
  padding: 0.65rem 0.7rem;
  border: 1px solid var(--shiritori-warm-edge);
  border-radius: 12px;
  background: #fbf1dc;
}

.shiritori-panel-label,
.shiritori-instruction {
  margin: 0;
  color: var(--muted);
  text-align: center;
  font-size: 0.85rem;
  font-weight: 700;
}

.shiritori-praise {
  min-height: 1.45rem;
  margin: 0;
  color: #9b601b;
  text-align: center;
  font-size: 0.9rem;
  font-weight: 800;
  line-height: 1.45rem;
}
.shiritori-praise .brain-praise { margin: 0; color: inherit; }

.shiritori-answer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  min-height: 2.6rem;
  margin-top: 0.35rem;
}

.shiritori-answer-word {
  padding: 0.32rem 0.5rem;
  border-radius: 8px;
  background: #fffaf0;
  border: 1px solid var(--shiritori-warm-edge);
  color: var(--ink);
  font-size: clamp(0.95rem, 3.4vw, 1.2rem);
  font-weight: 800;
  line-height: 1.2;
  overflow-wrap: anywhere;
}

.shiritori-arrow {
  color: var(--shiritori-accent);
  font-weight: 900;
}

.shiritori-empty {
  color: var(--muted);
  font-size: 0.9rem;
}

.shiritori-choices {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.55rem;
  width: 100%;
}

.shiritori-word-btn {
  min-height: 3.2rem;
  width: 100%;
  padding: 0.7rem 0.4rem;
  border: 1px solid var(--shiritori-warm-edge);
  border-radius: 11px;
  background: linear-gradient(180deg, #fffdf7, #fff8ea);
  box-shadow: 0 1px 3px rgba(105, 68, 28, 0.065);
  color: var(--ink);
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  font-family: inherit;
  font-size: clamp(1rem, 3.6vw, 1.25rem);
  font-weight: 800;
  line-height: 1.2;
  overflow-wrap: anywhere;
  transition: background-color 120ms, border-color 120ms, transform 120ms;
}

.shiritori-word-btn:hover:not(:disabled) {
  border-color: var(--shiritori-accent);
}

.shiritori-word-btn:active:not(:disabled) { transform: scale(0.985); }

.shiritori-word-btn:disabled {
  cursor: default;
}

.shiritori-word-btn.shiritori-word-selected,
.shiritori-word-btn.selected-correct {
  opacity: 1;
  border-color: #a8641f;
  background: #f5dca9;
  color: #604014;
  box-shadow: inset 0 0 0 1px rgba(168, 100, 31, 0.3);
}

.shiritori-word-btn.shiritori-word-wrong {
  border-color: #b42318;
  background: rgba(220, 38, 38, 0.16);
  color: #b42318;
  animation: shiritori-wrong-shake 0.18s linear 1;
}

@keyframes shiritori-wrong-shake {
  0%, 100% { transform: translateX(0); }
  35% { transform: translateX(-4px); }
  70% { transform: translateX(4px); }
}

@media (prefers-reduced-motion: reduce) {
  .shiritori-word-btn { transition: none; }
  .shiritori-word-btn.shiritori-word-wrong { animation: none; }
}

@media (max-width: 640px) {
  .game-area.game-shiritori-chain {
    gap: 0.45rem;
    padding: 0;
  }

  .shiritori-chain-panel {
    padding: 0.55rem 0.5rem;
  }

  .shiritori-choices {
    gap: 0.5rem;
  }

  .shiritori-word-btn {
    min-height: 3.4rem;
    padding: 0.85rem 0.4rem;
  }
}

@media (max-width: 430px) {
  .shiritori-word-btn {
    min-height: 44px;
  }
}

@media (max-height: 760px) and (min-width: 431px) {
  .game-area.game-shiritori-chain {
    gap: 0.35rem;
  }
  .shiritori-chain-panel {
    padding: 0.45rem 0.55rem;
  }
  .shiritori-answer {
    min-height: 2.1rem;
    margin-top: 0.2rem;
  }
  .shiritori-word-btn {
    min-height: 2.7rem;
    padding: 0.45rem 0.35rem;
    font-size: clamp(0.95rem, 2.4vw, 1.1rem);
  }
}