body {
     margin: 0;
     background: #121212;
     color: #fff;
     font-family: "Microsoft YaHei", sans-serif;
     display: flex;
     flex-direction: row;
     align-items: center;
     justify-content: center;
     height: 100vh;
     user-select: none;
   }

   #game-container {
     position: relative;
     border: 4px solid #444;
     box-shadow: 0 0 50px rgba(0, 0, 0, 0.8);
     background: #1a1a1a;
   }

   /* 图例样式 */
   #legend-container {
     margin-top: 10px;
     background: #222;
     padding: 10px;
     border-radius: 8px;
     border: 1px solid #444;
     display: grid;
     grid-template-columns: repeat(7, 1fr);
     gap: 10px 15px;
     width: 900px;
   }

   .legend-item {
     display: flex;
     align-items: center;
     font-size: 12px;
     color: #ccc;
   }

   .icon {
     width: 24px;
     height: 24px;
     margin-right: 8px;
     display: inline-block;
     position: relative;
   }

   /* 操作说明 */
   #controls {
     margin-top: 10px;
     font-size: 13px;
     color: #888;
     text-align: center;
   }

   .key {
     background: #ddd;
     color: #111;
     padding: 2px 6px;
     border-radius: 4px;
     font-weight: bold;
     border-bottom: 2px solid #999;
   }