html, body {
      # overflow: hidden;
      height: 100%;
      margin: 0;
      padding: 0;
      position: relative;
      background: linear-gradient(to bottom right, #e0f7ff, #f3e5f5);
      min-height: 100vh;
      font-family: "Segoe UI", "Helvetica Neue", sans-serif;
      color: #333;
    }
body {
      max-width: 720px;
      margin: 0 auto;
      # padding: 2rem;

      z-index: 1;
    }

.logo {
    position: absolute;
    top: 0;
    left: 0;
    width: 300px; /* 根据需要调整大小 */
    height: auto; /* 保持图片比例 */
  }

    /* 右下角大镰刀锤子图片 */
html::before {
      content: "";
      position: fixed;
      bottom: 0;
      right: 0;
      width: 25vw;
      height: 25vw;
      max-width: 500px;
      max-height: 500px;
      background: url('./image/background.png') no-repeat center center;
      background-size: contain;
      opacity: 0.25;
      pointer-events: none;
      z-index: 0;
    }

h1 {
      text-align: center;
      font-size: 2rem;
      color: #4a148c;
      margin-bottom: 2rem;
    }

.folder {
      margin-bottom: 1.5rem;
      border: 1px solid #ccc;
      border-radius: 8px;
      background: #ffffffcc;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
      transition: box-shadow 0.3s ease;
      max-width: 700px;
      margin-left: auto;
      margin-right: auto;
      position: relative;
      z-index: 1;
    }

.folder:hover {
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    }

.folder-name {
      font-size: 1.2rem;
      padding: 0.75rem 1rem;
      cursor: pointer;
      background: linear-gradient(to right, #64b5f6, #ba68c8);
      color: white;
      border-radius: 8px 8px 0 0;
      user-select: none;
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 700px;
      margin-left: auto;
      margin-right: auto;
      position: relative;
      z-index: 1;
    }

.folder-name:hover {
      filter: brightness(1.1);
    }

    .arrow {
      transition: transform 0.3s;
    }

    .arrow.open {
      transform: rotate(90deg);
    }

    .file-list {
      display: none;
      padding: 0.5rem 1.5rem 1rem 1.5rem;
      list-style: none;
      margin: 0;
      position: relative;
      z-index: 1;
    }

    .file-list li {
      margin: 0.5rem 0;
      font-size: 1rem;
    }

    .file-list a {
      text-decoration: none;
      color: #3949ab;
      margin: 0 0.3rem;
    }

    .file-list a:hover {
      text-decoration: underline;
    }

    .note {
      text-align: center;
      margin-top: 2rem;
      color: #666;
      font-size: 0.9rem;
      position: relative;
      z-index: 1;
    }