body {
  min-height: 100vh;
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 20px;
}

.input-container {
  margin-bottom: 20px;
  text-align: center;
}

.input-container label {
  display: block;
  margin-bottom: 8px;
  font-weight: bold;
}

.input-container input,
.input-container textarea {
  width: 600px;
  padding: 8px;
  border: 2px solid #ddd;
  border-radius: 5px;
  font-size: 14px;
  margin-right: 10px;
  font-family: monospace;
}

.input-container textarea {
  resize: vertical;
  min-height: 120px;
}

.input-container button {
  padding: 8px 16px;
  background: #007acc;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 14px;
}

.input-container button:hover {
  background: #005a99;
}

.boards-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  max-width: 100%;
  overflow-x: auto;
}

.board-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.board-title {
  font-size: 16px;
  font-weight: bold;
  color: #333;
  text-align: center;
}

.arrow-container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 50px;
}

.arrow-down {
  font-size: 30px;
  color: #007acc;
  font-weight: bold;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%,
  20%,
  50%,
  80%,
  100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-10px);
  }
  60% {
    transform: translateY(-5px);
  }
}

.board {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 7px;
  padding: 10px;
  border: 1px solid #ccc;
}

.col {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.cell {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: bold;
  font-size: 20px;
  border: 2px solid #eee;
  box-sizing: border-box;
  transition: background 0.2s;
  background: #ccc;
  box-shadow: 0 2px 7px #0001;
  z-index: 9999;
  user-select: none; /* 防止文字被選取 */
  -webkit-user-select: none; /* Safari 支援 */
  -moz-user-select: none; /* Firefox 支援 */
  -ms-user-select: none; /* IE/Edge 支援 */
}

.cell.blink {
  animation: cellBlink 1s infinite;
  cursor: pointer; /* 添加指針游標提示可點擊 */
}

.cell.blink-hidden {
  opacity: 0; /* 完全透明但仍可點擊 */
  animation: none; /* 停止動畫 */
  cursor: pointer; /* 保持可點擊的游標提示 */
}

@keyframes cellBlink {
  0%,
  50% {
    opacity: 1;
    transform: scale(1);
  }
  25% {
    opacity: 0.9;
    transform: scale(1.03);
  }
  75% {
    opacity: 0.95;
    transform: scale(0.97);
  }
}

/* 添加點擊後的淡出效果 */
.cell.fade-out {
  animation: fadeOut 0.5s ease-out forwards;
}

@keyframes fadeOut {
  from {
    opacity: 1;
    transform: scale(1);
  }
  to {
    opacity: 0.3;
    transform: scale(0.95);
  }
}

.border-overlay {
  position: absolute;
  border: 2px solid #c9c8c8;
  border-radius: 15px;
  pointer-events: none; /* 不阻擋點擊事件 */
  z-index: 10;
}

.border-overlay-silver {
  border: 3px solid #929292;
  background: rgba(192, 192, 192, 0.15);
  box-shadow: 0 0 15px rgba(192, 192, 192, 0.4);
  background: #929292;
}

.border-overlay-gold {
  border: 3px solid #ffd700;
  background: rgba(255, 215, 0, 0.15);
  box-shadow: 0 0 15px rgba(255, 215, 0, 0.4);
  background: #ffd700;
}

.cell.bordered {
  border: 3px solid #ff0000;
  box-shadow: 0 0 10px rgba(255, 0, 0, 0.5);
}
.empty {
  visibility: hidden;
}