body {
  font-family: 'Quicksand', sans-serif;
  margin: 0;
  min-height: 100vh;
  background-color: #e493d0;
  background-image: 
    radial-gradient(closest-side, rgba(235, 105, 78, 1), rgba(235, 105, 78, 0)),
    radial-gradient(closest-side, rgb(231, 100, 187), rgba(243, 11, 164, 0)),
    radial-gradient(closest-side, rgba(254, 234, 131, 1), rgba(254, 234, 131, 0)),
    radial-gradient(closest-side, rgba(170, 142, 245, 1), rgba(170, 142, 245, 0)),
    radial-gradient(closest-side, rgba(248, 192, 147, 1), rgba(248, 192, 147, 0));
  background-size: 
    130vmax 130vmax,
    80vmax 80vmax,
    90vmax 90vmax,
    110vmax 110vmax,
    90vmax 90vmax;
  background-position:
    -80vmax -80vmax,
    60vmax -30vmax,
    10vmax 10vmax,
    -30vmax -10vmax,
    50vmax 50vmax;
  background-repeat: no-repeat;
  animation: 10s movement linear infinite;
}
body::after {
  content: '';
  display: block;
  position: fixed;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  pointer-events: none;
  z-index: -1;
}

@keyframes movement {
  0%, 100% {
    background-size: 
      130vmax 130vmax,
      80vmax 80vmax,
      90vmax 90vmax,
      110vmax 110vmax,
      90vmax 90vmax;
    background-position:
      -80vmax -80vmax,
      60vmax -30vmax,
      10vmax 10vmax,
      -30vmax -10vmax,
      50vmax 50vmax;
  }
  25% {
    background-size: 
      100vmax 100vmax,
      90vmax 90vmax,
      100vmax 100vmax,
      90vmax 90vmax,
      60vmax 60vmax;
    background-position:
      -60vmax -90vmax,
      50vmax -40vmax,
      0vmax -20vmax,
      -40vmax -20vmax,
      40vmax 60vmax;
  }
  50% {
    background-size: 
      80vmax 80vmax,
      110vmax 110vmax,
      80vmax 80vmax,
      60vmax 60vmax,
      80vmax 80vmax;
    background-position:
      -50vmax -70vmax,
      40vmax -30vmax,
      10vmax 0vmax,
      20vmax 10vmax,
      30vmax 70vmax;
  }
  75% {
    background-size: 
      90vmax 90vmax,
      90vmax 90vmax,
      100vmax 100vmax,
      90vmax 90vmax,
      70vmax 70vmax;
    background-position:
      -50vmax -40vmax,
      50vmax -30vmax,
      20vmax 0vmax,
      -10vmax 10vmax,
      40vmax 60vmax;
  }
}

    .nav-active {
      color: #fff;
      background-color: #007bff;
      font-weight: bold;
    }

        /* 加载动画样式 */
        .loader {
            position: fixed;
            top: 0;
            left: 0;
            width: 100vw;
            height: 100vh;
            background: rgba(255, 255, 255, 0.9); /* 半透明背景 */
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 9999; /* 覆盖层 */
            transition: opacity 0.5s ease;
        }

        .spinner {
            width: 50px;
            height: 50px;
            border: 6px solid #f3f3f3;
            border-top: 6px solid #3498db;
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        /* 页面内容样式 */
        #content {
            padding: 20px;
            text-align: center;
        }