body {
  font-family: Arial, sans-serif;
  background-color: #faf8ef;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  box-sizing: border-box;
  overscroll-behavior: none;  /* 添加这行 */
  touch-action: none;         /* 添加这行 */
}

.container {
  width: 100%;
  max-width: 500px;
  text-align: center;
  padding: 10px;
}

h1 {
  font-size: clamp(2rem, 8vw, 3rem);
  color: #776e65;
  margin: 10px 0;
}

.score, .high-score {
  font-size: clamp(1.2rem, 4vw, 1.5rem);
  margin: 10px 0;
  color: #776e65;
}

.grid {
  background-color: #bbada0;
  border-radius: 6px;
  position: relative;
  width: 100%;
  margin: 0 auto;
}

/* 使grid保持正方形 */
.grid::before {
  content: "";
  display: block;
  padding-top: 100%;
}

.grid .cell {
  position: absolute;
  width: calc(25% - 10px);
  height: calc(25% - 10px);
  margin: 5px;
  background-color: #cdc1b4;
  border-radius: 3px;
}

/* 设置网格布局 */
.grid .cell:nth-child(1) { top: 0; left: 0; }
.grid .cell:nth-child(2) { top: 0; left: 25%; }
.grid .cell:nth-child(3) { top: 0; left: 50%; }
.grid .cell:nth-child(4) { top: 0; left: 75%; }
.grid .cell:nth-child(5) { top: 25%; left: 0; }
.grid .cell:nth-child(6) { top: 25%; left: 25%; }
.grid .cell:nth-child(7) { top: 25%; left: 50%; }
.grid .cell:nth-child(8) { top: 25%; left: 75%; }
.grid .cell:nth-child(9) { top: 50%; left: 0; }
.grid .cell:nth-child(10) { top: 50%; left: 25%; }
.grid .cell:nth-child(11) { top: 50%; left: 50%; }
.grid .cell:nth-child(12) { top: 50%; left: 75%; }
.grid .cell:nth-child(13) { top: 75%; left: 0; }
.grid .cell:nth-child(14) { top: 75%; left: 25%; }
.grid .cell:nth-child(15) { top: 75%; left: 50%; }
.grid .cell:nth-child(16) { top: 75%; left: 75%; }

.tile {
  position: absolute;
  width: calc(25% - 10px);
  height: calc(25% - 10px);
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: clamp(1.5rem, 6vw, 2rem);
  font-weight: bold;
  border-radius: 3px;
  transition: all 0.15s ease-in-out;
  z-index: 1;
  margin: 5px;
}

/* 数字方块的颜色 */
.tile[data-value="2"] { background-color: #eee4da; color: #776e65; }
.tile[data-value="4"] { background-color: #ede0c8; color: #776e65; }
.tile[data-value="8"] { background-color: #f2b179; color: #f9f6f2; }
.tile[data-value="16"] { background-color: #f59563; color: #f9f6f2; }
.tile[data-value="32"] { background-color: #f67c5f; color: #f9f6f2; }
.tile[data-value="64"] { background-color: #f65e3b; color: #f9f6f2; }
.tile[data-value="128"] { background-color: #edcf72; color: #f9f6f2; font-size: clamp(1.2rem, 5vw, 1.8rem); }
.tile[data-value="256"] { background-color: #edcc61; color: #f9f6f2; font-size: clamp(1.2rem, 5vw, 1.8rem); }
.tile[data-value="512"] { background-color: #edc850; color: #f9f6f2; font-size: clamp(1.2rem, 5vw, 1.8rem); }
.tile[data-value="1024"] { background-color: #edc53f; color: #f9f6f2; font-size: clamp(1rem, 4vw, 1.6rem); }
.tile[data-value="2048"] { background-color: #edc22e; color: #f9f6f2; font-size: clamp(1rem, 4vw, 1.6rem); }

.tile.merged {
  animation: pop 0.15s ease-in-out;
}

@keyframes pop {
  0% { transform: scale(1); }
  50% { transform: scale(1.2); }
  100% { transform: scale(1); }
}

#new-game {
  margin-top: 20px;
  padding: 10px 20px;
  font-size: clamp(0.9rem, 3vw, 1rem);
  color: #f9f6f2;
  background-color: #8f7a66;
  border: none;
  border-radius: 3px;
  cursor: pointer;
  transition: background-color 0.15s ease-in-out;
}

#new-game:hover {
  background-color: #9c8a77;
}