body {
    background: #f9f9f9;
    font-family: 'Segoe UI', sans-serif;
  }
  
  .card {
    border-radius: 16px;
  }
  
  .card-title {
    font-weight: bold;
  }
  
  footer {
    position: relative;
    bottom: 0;
    width: 100%;
  }
  
  .piece-3d {
    /* Removed text-shadow and drop-shadow for classic look */
  }
  
  .piece-img {
    width: 90%;
    height: 90%;
    object-fit: contain;
    pointer-events: none;
    user-select: none;
    display: block;
    margin: auto;
  }
  
  .chess-square {
    width: 100%;
    height: 100%;
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    min-height: 36px;
    min-width: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    user-select: none;
    transition: background 0.2s;
    position: relative;
    overflow: hidden;
    padding: 0;
  }
  
  .piece-css {
    width: auto;
    height: auto;
    font-size: 4vw;
    line-height: 1;
    padding: 0;
    margin: 0;
    display: block;
  }
  
  .piece-w {
    color: #fff;
    font-weight: 900;
    text-shadow: 0 1px 0 #bbb, 0 2px 2px #0003, 0 0 2px #fff, 0 0 6px #fff;
    font-size: inherit;
  }
  
  .piece-b {
    color: #222;
    font-weight: 700;
    text-shadow: 0 1px 0 #888, 0 2px 2px #0006;
    font-size: inherit;
  }