body {
    margin: 0;
    overflow: hidden;
    background: black;
    font-family: sans-serif;
    color: white;
  }
  
  .navbar {
    position: fixed;
    top: 0;
    width: 100%;
    height: 60px;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    padding: 0 20px;
    z-index: 10000;
  }
  
  .navbar ul {
    display: flex;
    align-items: center;
    justify-content: center; /* ✅ 水平居中对齐 */
    list-style: none;
    margin: 0;
    padding: 0;
    width: 100%;
  }
  
  .navbar li {
    margin: 0 15px;
  }
  
  .navbar ul li a {
    text-decoration: none;
    color: white;
    font-size: 1.2rem;
    font-weight: bold;
    transition: color 0.3s ease;
  }
  
  .nav-logo {
    margin-right: auto;
  }
  
  .logo-img {
    height: 40px;
    width: auto;
  }
  
  /* Camera */
  video {
    position: fixed;
    top: 70px;
    right: 10px;
    width: 160px;
    height: 120px;
    transform: scaleX(-1);
    z-index: 500;
    border: 2px solid white;
  }
  
  /* Canvas */
  canvas {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 9999;
    pointer-events: none;
  }
  
  /* Images */
  .img {
    position: fixed;
    width: 120px;
    height: 120px;
    opacity: 0;
    transition: opacity 0.5s ease;
    pointer-events: none;
    z-index: 10;
  }
  .img.show {
    opacity: 1;
  }
  #img0 { width: 200px; height: 200px; left: 50%; top: 50%; transform: translate(-50%, -50%); }
  #img1 { top: 20%; left: 30%; }
  #img2 { top: 20%; right: 30%; }
  #img3 { bottom: 20%; left: 25%; }
  #img4 { bottom: 20%; right: 25%; }