:root {
      --primary-color: #8975ff; /* 主色调 */
      --primary-dark: #7360df;  /* 深色（悬停态） */
      --primary-light: #f7f5ff; /* 浅色背景 */
      --bg-color: #ffffff;
      --text-color: #333333;
      --header-text: #666666;
      --border-color: #e5e5e5;
      --hover-bg: #f8f7ff;
      --icon-color: #666;
    }

    html, body {
      height: 100%;
      margin: 0;
      display: flex;
      flex-direction: column;
      font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
      background-color: #f5f7fa;
      color: #444;
      line-height: 1.6;
    }

    #content {
      flex: 1;
      display: flex;
      flex-direction: column;
    }

    /* --- Header 样式优化 --- */
    header {
      background: linear-gradient(135deg, #8975ff 0%, #a08eff 100%);
      color: white;
      padding: 15px 0;
      box-shadow: 0 2px 10px rgba(137, 117, 255, 0.2);
    }

    nav ul {
      list-style-type: none;
      padding: 0;
      margin: 0;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    nav ul li {
      margin: 0 20px;
    }

    nav ul li a {
      color: white;
      text-decoration: none;
      font-size: 15px;
      font-weight: 500;
      transition: opacity 0.2s;
    }
    
    nav ul li a:hover {
      opacity: 0.8;
    }

    /* --- Hero 区域 --- */
    #hero {
      background-color: var(--primary-light);
      color: #333;
      text-align: center;
      padding: 40px 20px;
      border-bottom: 1px solid #eee;
    }

    #hero h1 {
      margin: 0 0 10px 0;
      font-size: 1.8em;
      font-weight: 700;
      color: #2c3e50;
    }

    #hero p {
      font-size: 1em;
      color: #666;
      max-width: 800px;
      margin: 0 auto;
    }

    /* --- 布局容器 --- */
    .container {
      max-width: 1000px;
      margin: 0 auto;
    }

    .flex {
      display: flex;
      justify-content: center;
      align-items: center;
      flex-wrap: wrap;
    }

    #features, #software-share {
      padding: 30px 20px;
      text-align: center;
      margin-bottom: 100px;
      max-width: 1200px;
      width: 1200px;
    }

    /* --- 模拟文件列表样式 (核心部分) --- */
    .img-box {
      background: #fff;
      min-height: 450px;
      width: 100%;
      max-width: 800px;
      border-radius: 12px;
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.05);
      padding: 20px;
      margin-bottom: 30px;
      box-sizing: border-box;
    }

    .top-bar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 20px;
      border-bottom: 1px solid #f0f0f0;
      padding-bottom: 15px;
    }

    .breadcrumb {
      font-size: 16px;
      font-weight: 600;
      color: #333;
    }

    .view-switchers {
      display: flex;
      gap: 8px;
    }

    .btn-icon {
      width: 32px;
      height: 32px;
      border: 1px solid #eee;
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      background: #fff;
      transition: all 0.2s;
    }

    .btn-icon:hover {
      background-color: var(--hover-bg);
      border-color: var(--primary-color);
    }

    .btn-icon svg {
      width: 18px;
      height: 18px;
      fill: #888;
    }
    
    .btn-icon:hover svg {
      fill: var(--primary-color);
    }

    /* 表头 */
    .file-list-header {
      display: grid;
      grid-template-columns: 40px 1fr 100px 180px;
      padding: 10px 10px;
      font-size: 13px;
      color: #888;
      border-bottom: 1px solid transparent;
    }

    .col-checkbox, .col-name {
      display: flex;
      align-items: center;
    }
    
    .col-name { cursor: pointer; }
    .col-name span { margin-right: 4px; }

    /* 文件项 */
    .file-item {
      display: grid;
      grid-template-columns: 40px 1fr 100px 180px;
      padding: 12px 10px;
      align-items: center;
      border-radius: 8px;
      background-color: #fbfbfb;
      font-size: 14px;
      color: #333;
      transition: all 0.2s;
      margin-bottom: 8px;
      border: 1px solid transparent;
    }

    .file-item:hover {
      background-color: var(--primary-light);
      border-color: rgba(137, 117, 255, 0.3);
    }

    /* 模拟选中框 */
    .checkbox {
      width: 16px;
      height: 16px;
      border: 1px solid #ccc;
      border-radius: 4px;
      display: flex;
      align-items: center;
      justify-content: center;
      background-color: var(--primary-color); /* 选中变成主色 */
      cursor: pointer;
    }

    .checkbox::after {
      content: "✓";
      color: white;
      font-size: 12px;
    }

    /* 图标颜色调整 */
    .file-info { display: flex; align-items: center; gap: 12px; }

    .file-icon {
      width: 36px;
      height: 36px;
      background-color: #ece9ff; /* 浅紫底 */
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-color);
      overflow: hidden;
      flex: 1;
    }
    .file-icon img { width: 100%; height: 100%; object-fit: cover; }

    .file-actions {
      display: flex;
      gap: 12px;
      justify-self: end;
      margin-right: 10px;
    }

    .action-icon {
      cursor: pointer;
      width: 18px;
      height: 18px;
      fill: #999;
      transition: fill 0.2s;
    }
    
    .file-item:hover .action-icon {
      fill: var(--primary-color); /* 悬停变成主色 */
    }

    /* --- 功能列表与下载按钮 --- */
    .features-list-box {
      max-width: 300px;
      margin: 0 auto;
      text-align: left;
    }

    .features-list-box h2 {
      font-size: 20px;
      color: #333;
      border-left: 4px solid var(--primary-color);
      padding-left: 12px;
      margin-bottom: 20px;
    }

    .features-list-box ul {
      list-style-type: none;
      padding: 0;
      margin-bottom: 30px;
    }

    .features-list-box ul li {
      font-size: 14px;
      margin: 10px 0;
      background: #fff;
      padding: 12px 15px;
      border-radius: 6px;
      box-shadow: 0 2px 5px rgba(0,0,0,0.03);
      border: 1px solid #eee;
      display: flex;
      align-items: center;
    }

    .features-list-box ul li::before {
      content: "•";
      color: var(--primary-color);
      font-size: 20px;
      margin-right: 10px;
      line-height: 1;
    }

    #download-btns {
      text-align: center;
      margin-top: 30px;
    }

    .download-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background-color: var(--primary-color);
      color: white;
      padding: 12px 30px;
      text-decoration: none;
      font-size: 15px;
      font-weight: 600;
      margin: 0 10px;
      border-radius: 50px; /* 圆角按钮 */
      border: none;
      transition: all 0.3s;
      box-shadow: 0 4px 12px rgba(137, 117, 255, 0.4);
    }

    .download-btn:hover {
      background-color: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 6px 15px rgba(137, 117, 255, 0.5);
    }
    
    /* 第二个按钮作为次级按钮 */
    .download-btn + .download-btn {
      background-color: #fff;
      color: var(--primary-color);
      border: 1px solid var(--primary-color);
      box-shadow: none;
    }
    
    .download-btn + .download-btn:hover {
      background-color: var(--primary-light);
    }

    /* --- Footer --- */
    footer {
      background-color: #2a2a2a;
      border-top: 3px solid var(--primary-color);
      color: #aaa;
      text-align: center;
      padding: 20px 10px;
      font-size: 12px;
      position: fixed;
      bottom: 0;
      width: 100%;
    }

    /* --- 移动端响应式 --- */
    @media screen and (max-width: 768px) {
      .file-list-header, .file-item {
        grid-template-columns: 40px 1fr; /* 手机上隐藏日期和大小 */
      }
      .col-size, .col-date, .file-size, .file-date {
        display: none;
      }
      .btn-icon { display: none; }
      #hero h1 { font-size: 1.4em; }
    }

    .file-name-container{
      display: flex;
      align-items: center;
      justify-content: space-between;

    }

    /* --- 广告位样式 (保持原逻辑) --- */
    .ad-sidebar {
      position: fixed;
      top: 50%;
      transform: translateY(-50%);
      width: 120px;
      z-index: 9999;
      display: none;
    }
    .ad-sidebar img {
      width: 100%;
      border-radius: 4px;
      box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    }
    .ad-left { left: 10px; }
    .ad-right { right: 10px; }
    @media screen and (min-width: 1300px) {
      .ad-sidebar { display: block; }
    }