* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    }
        /* 焦点（Focus） */
        a:focus {
          outline: 2px solid #3A7BBD; /* 主蓝色 */
          outline-offset: 2px;       /* 与元素保持一点距离 */
        }
        
        a:focus-visible {
          outline: 2px solid #3A7BBD; /* 键盘导航时显示 */
        }

        /* 顶部黑色导航栏 */
        .top-nav {
            background: linear-gradient(90deg, #1e3a5f 0%, #0d2b4e 100%);
            padding: 10px 0;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }
        .top-nav-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 25px;
            padding: 0 20px;
        }
        .top-nav a {
            color: #CBD5E0;
            text-decoration: none;
            font-size: 13px;
            font-weight: 500;
            transition: color 0.3s;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .top-nav a:hover {
            color: #fff;
        }



        /* 白色主导航栏 */
        .main-nav {

            background-color: #ffffff;
            border-bottom: 1px solid #E2E8F0;
            padding: 0;
            height: 67px;
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.05);
        }
        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            height: 100%;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo-section {
            display: flex;
            align-items: center;
            gap: 30px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 22px;
            font-weight: 700;
            color: #3A7BBD;
            text-decoration: none;
        }


        

        .main-menu {
          display: flex;
          gap: 25px;
          align-items: center;
          /* 固定高度，防止任何波动 */
          height: 36px;
          /* 或者用 min-height，避免内容溢出 */
      }

      /* 将每个链接包裹在 div 中（可选，但更稳定） */
      .main-menu a {
          color: #4A5568;
          text-decoration: none;
          font-size: 14px;
          font-weight: 500;
          line-height: 1.5;
          transition: color 0.3s ease;
          /* 关键：不再依赖 inline-block，改为 flex 子项自然排列 */
          position: relative;
          padding: 5px 0;
          /* 不设置 display: inline-block */
      }

      /* 使用 ::after 统一处理所有下划线效果 */
      .main-menu a::after {
          content: '';
          position: absolute;
          bottom: 0;
          left: 0;
          width: 0;
          height: 2px;
          background: #FF7A59;
          /* 默认隐藏，但存在 */
          visibility: hidden;
          transition: 
              width 0.4s cubic-bezier(0.4, 0, 0.2, 1),
              background 0.3s ease;
      }

      /* 默认 active 状态 */
      .main-menu a.active::after {
          visibility: visible;
          width: 100%;
          background: #FF7A59;
          transition: none; /* 初始状态无动画 */
      }

      /* hover 状态 */
      .main-menu a:hover::after {
          visibility: visible;
          width: 100%;
          background: linear-gradient(90deg, #FF7A59, #FF5E5E);
      }

      .main-menu a:hover {
          color: #2D3748;
      }

      /* 鼠标进入菜单：隐藏 active 下划线 */
      .main-menu:hover a.active::after {
          visibility: hidden;
      }

        .nav-right {
            display: flex;
            align-items: center;
            gap: 20px;
        }


        .my-files {
            background: linear-gradient(135deg, #3A7BBD 0%, #2a6ca9 100%);
            color: white;
            padding: 8px 16px;
            border-radius: 6px;
            font-size: 13px;
            display: flex;
            align-items: center;
            gap: 8px;
            text-decoration: none;
            font-weight: 500;
            box-shadow: 0 2px 8px rgba(58, 123, 189, 0.3);
            transition: all 0.3s ease;
        }
        .my-files:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(58, 123, 189, 0.4);
        }
        .file-count-badge {
            background-color: rgba(255, 255, 255, 0.25);
            padding: 2px 8px;
            border-radius: 6px;
            font-size: 11px;
            font-weight: bold;
        }
        .auth-buttons {
            display: flex;
            gap: 15px;
            align-items: center;
        }
        .auth-buttons a {
            color: #4A5568;
            text-decoration: none;
            font-size: 13px;
            font-weight: 500;
            transition: all 0.3s;
        }
        .login-btn:hover {
            color: #2D3748;
        }
        .common-btn {
            background: linear-gradient(135deg, #2ECC71 0%, #1ABC9C 100%);
            color: white !important;
            padding: 8px 18px;
            border-radius: 6px;
            transition: all 0.3s ease;
            box-shadow: 0 2px 8px rgba(46, 204, 113, 0.3);
            border: none !important;
           outline: none !important;
        }
        .common-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(46, 204, 113, 0.4);
        }
        /* 主内容区域 */
        .main-content-convert {
         /*    min-height: calc(100vh - 135px);*/
            min-height: 400px;
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 60px 20px 20px;
        }
        .page-title {
            font-size: 46px;
            font-weight: 700;
            background: linear-gradient(135deg, #3A7BBD 0%, #2a6ca9 100%);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            margin-bottom: 12px;
            text-align: center;
            letter-spacing: -0.5px;
        }
        .page-subtitle {
            font-size: 18px;
            color: #4A5568;
            margin-bottom: 50px;
            text-align: center;
            font-weight: 400;
            max-width: 600px;
            line-height: 1.6;
        }

    /* 默认隐藏 mobile-menu */
    .mobile-menu {
      display: none;
      padding: 8px 0;

    }

    .mobile-menu {
      display: flex;
      justify-content: center;
      gap: 20px;
      flex-wrap: wrap;
       padding: 10px 20px 10px;

    }

    .mobile-menu a {
      color: #333;
      text-decoration: none;
      font-size: 13px;
      white-space: nowrap;
    }

    
 
  /*原网页内置结束*/
    




 
body {
  background: linear-gradient(135deg, #f0f5ff 0%, #e6f0ff 100%);

  display: flex;
  flex-direction: column;

  font-family: 'Segoe UI', 'SF Pro Display', -apple-system, BlinkMacSystemFont, Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: #F9FAFB;
  min-height: 100vh;
  color: #4A5568;
    
}

.container {
  width: 100%;
  max-width: 1400px;
  background: white;
  border-radius: 10px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
  overflow: hidden;
  position: relative;
}

.header-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 180px;
  background: linear-gradient(135deg, #3A7BBD 0%, #2a6ca9 100%); /* 更深的蓝色渐变 */
  z-index: 0;
  border-radius: 0 0 10% 10%;
  transform: scale(1.5);
}

header {
  position: relative;
  z-index: 1;
  color: white;
  padding: 0;
  text-align: center;
}

header h1 {
  font-size: 1.8rem;
  margin-bottom: 10px;
  font-weight: 700;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

header p {
  font-size: 0.9rem;
  opacity: 0.9;
  max-width: 800px;
  margin: 0 auto;
  font-weight: 300;
  line-height: 1.5;
}

.main-content {
  display: flex;
  flex-direction: column;
  padding: 0;
  position: relative;
  z-index: 1;
}

.top-section {
  display: flex;
  padding: 0;
  min-height: 300px;
}

.left-section {
  flex: 0 0 28.2%;   /* 调整左侧部分的宽度 */
  padding: 5px 25px 5px 25px;
  background: #F8F9FA; /* 更亮的背景 */
  border-right: 1px solid #E9ECEF;
}

.right-section {
  flex: 1;         /* 右侧部分占据剩余空间 */
  padding: 1px;
  background: #ffffff;
  display: flex;
  flex-direction: column;
}

.bottom-section {
  width: 100%;
  padding: 10px 25px 15px 25px;
  background: #F8F9FA; /* 更亮的背景 */
  border-top: 1px solid #E9ECEF;
}

.section-title {
  font-size: 1.2rem;
  padding: 10px 25px 10px 25px;
  margin-bottom: 5px;
  color: #2C3E50; /* 更深的标题颜色 */
  font-weight: 600;
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: 10px;
   /* 可选：防止换行 */
  white-space: nowrap;
}

.section-title i {
  color: #3A7BBD; /* 主蓝色 */
  background: #EBF4FF;
  width: 24px;
  height: 24px;
  border-radius: 10%;
  display: flex;
  align-items: center;
  justify-content: left;
  box-shadow: 0 3px 8px rgba(58, 123, 189, 0.2);
}

/* 文件选择区域 */
.file-options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 5px;
}

.file-option {
  background: white;
  border: 2px solid #E2E8F0;
  border-radius: 10px;
  padding: 15px 8px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  min-height: 130px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.file-option:hover {
  transform: translateY(-4px);
  border-color: #FF7A59;/* 主蓝色 #3A7BBD; */
  box-shadow: 0 6px 16px rgba(58, 123, 189, 0.2);
}

.file-option i {
  font-size: 2.2rem;
  margin-bottom: 5px;
  color: #3A7BBD; /* 主蓝色 */
  background: linear-gradient(135deg, #3A7BBD, #4A90E2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.file-option h3 {
  font-size: 1.05rem;
  margin-bottom: 5px;
  color: #2C3E50; /* 更深的标题颜色 */
}

.file-option p {
  font-size: 0.85rem;
  color: #6C757D; /* 中灰色文字 */
}

/* 文件转换区域 */
.format-selector {
  margin-bottom: 5px;
  background: #F8F9FA; /* 更亮的背景 */
  padding: 5px 25px 5px 25px;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
}

.pc-only {
  display: block;
}

.small-screen-only {
  display: none;
}

.format-category {
  margin-bottom: 10px;
  position: relative;
}

.format-category label {
  display: block;
  margin-bottom: 10px;
  font-weight: 600;
  color: #2C3E50; /* 更深的标题颜色 */
  font-size: 1rem;
}

.format-buttons {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.format-btn {
  background: #E9ECEF;
  border: none;
  border-radius: 4px;
  padding: 4px 9px;
  color: #495057;
  cursor: pointer;
  font-weight: 400;
  transition: all 0.2s;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
  font-size: 0.9rem;

}

.format-btn.active {
  background: #3A7BBD; /* 主蓝色 */
  color: white;
  box-shadow: 0 4px 12px rgba(58, 123, 189, 0.3);


}

.sub-format {
  margin-top: 7px;
}

.sub-format label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: #495057;
  font-size: 0.95rem;
}

.format-search {
  flex-grow: 1;
  min-width: 200px;
  position: relative;
  padding: 10px 0px 10px 0px;
}

.search-top {
  display: flex;
  flex-direction: row;
}

.format-search input {
  flex: 1;
  width: 100%;
  padding: 10px 15px 10px 40px;
  border-radius: 6px;
  border: 2px solid #E2E8F0;
  font-size: 0.8rem;
  transition: all 0.3s;
  background: white;
  color: #495057;
}

.format-search input:focus {
  outline: none;
  border-color: #3A7BBD; /* 主蓝色 */
  box-shadow: 0 0 0 3px rgba(58, 123, 189, 0.2);
}

.format-search span {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%) !important;
  color: #6C757D;
  font-size: 0.9rem;
}

.format-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: 10px;
  height: 180px;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 12px;
  background: white;
  border-radius: 10px;
  border: 2px solid #E2E8F0;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
   
  /* 可选：防止内容被裁剪时闪烁 */
  contain: layout;
}

/* 自定义滚动条 - 美观现代风格（仅在出现时显示） */
.format-grid::-webkit-scrollbar {
  width: 6px; /* 细长滚动条，不抢戏 */
}

.format-grid::-webkit-scrollbar-track {
  background: transparent; /* 轨道透明，不占视觉空间 */
  margin-block: 4px; /* 上下留白，避免贴边 */
}

.format-grid::-webkit-scrollbar-thumb {
  background-color: #CBD5E0; /* 灰蓝色，与整体设计协调 */
  border-radius: 8px;
  border: 2px solid transparent;
  background-clip: content-box;
  transition: background-color 0.2s ease;
}

.format-grid::-webkit-scrollbar-thumb:hover {
  background-color: #94A3B8; /* 悬停时加深 */
  transition: background-color 0.2s ease;
}
   

/* Firefox 支持 */
@supports (scrollbar-width: auto) {
  .format-grid {
    scrollbar-width: thin; /* "thin" 滚动条更优雅 */
    scrollbar-color: #CBD5E0 transparent; /* 滑块颜色 | 轨道颜色（透明） */
  }
}


  
 
.format-grid::-webkit-scrollbar {
  width: 8px;
}

.format-grid::-webkit-scrollbar-track {
  background: #F1F5F9;
  border-radius: 4px;
}

.format-grid::-webkit-scrollbar-thumb {
  background: #CBD5E0;
  border-radius: 4px;
}

/* 格式列表*/
.format-item {
  height: 72px;
  padding: 12px 8px;
  border-radius: 6px;
  background: #F8F9FA;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  border: 2px solid transparent;
  /* 新增 上下排列样式*/
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;

  /* 防止内容撑开容器 */
  overflow: hidden;
  white-space: nowrap;

}

.format-item:hover {
 /* background: #EBF4FF;*/
  border-color: #FF7A59;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(58, 123, 189, 0.2);
}
/* 格式列表中选中 */
.format-item.active {


 /* background: linear-gradient(135deg, #3A7BBD 0%, #2a6ca9 100%);*/
 /* color: white;*/
  border-color: #FF7A59;
   border-radius: 6px;
  box-shadow: 0 4px 12px rgba(58, 123, 189, 0.3);
}

.format-item span {
  font-size: 1.5rem;
  margin-bottom: 1px;
  display: block;
}

.format-item.active span {
  color: #FF7A59;
}

.format-name {
  font-size: 0.8rem;
  font-weight: 500;
}

.convert-btn {
  background: linear-gradient(120deg, #FF7A59, #FF6B6B); /* 珊瑚橙色渐变 */
  color: white;
  border: none;
  border-radius: 6px;
  padding: 15px 25px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
  margin: 10px 0;
  transition: all 0.3s;
  box-shadow: 0 5px 15px rgba(255, 122, 89, 0.4);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 5px;
}

.convert-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 7px 20px rgba(255, 122, 89, 0.5);
  background: linear-gradient(120deg, #FF6B6B, #FF7A59);
}

.convert-btn:disabled {
  background: #CBD5E0;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

/* 合并后的文件列表 */
.file-management {
  display: flex;
  flex-direction: column;
  gap: 25px;
}

.file-panel {
  background: white;
  border-radius: 8px;
  padding: 20px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
  display: flex;
  flex-direction: column;
}

.file-panel h3 {
  font-size: 1.05rem;
  margin-bottom: 15px;
  color: #2C3E50; /* 更深的标题颜色 */
  display: flex;
  align-items: center;
  gap: 10px;
}

.file-panel h3 i {
  color: #3A7BBD; /* 主蓝色 */
  background: #EBF4FF;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 3px 8px rgba(58, 123, 189, 0.2);
}

.combined-list {
  flex: 1;
  overflow-y: auto;
  max-height: 320px;
  padding-right: 8px;
}

.combined-list::-webkit-scrollbar {
  width: 6px;
}

.combined-list::-webkit-scrollbar-thumb {
  background: #CBD5E0;
  border-radius: 3px;
}

/* 统一文件队列项布局 */
.combined-item {
  padding: 10px 12px;
  background: #F8F9FA;
  border-radius: 6px;
  margin-bottom: 10px;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 12px;
  position: relative;
}

.combined-item:hover {
  transform: translateX(3px);
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.1);
  background: #EBF4FF;
}

.combined-item:last-child {
  margin-bottom: 0;
}

.combined-icon {
  width: 32px;
  height: 32px;
  background: #EBF4FF;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #3A7BBD; /* 主蓝色 */
  font-size: 1rem;
  flex-shrink: 0;
}

/* 文件信息区域 */
.file-info-main {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 0;
  flex-wrap: wrap;
}

.file-name-container {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  max-width: 30%;
}

.original-name {
  font-weight: 600;
  font-size: 0.9rem;
  color: #2C3E50; /* 更深的标题颜色 */
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 180px;
}

.conversion-arrow {
  color: #6C757D;
  font-size: 0.8rem;
  flex-shrink: 0;
}

.converted-file {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.converted-name {
  font-weight: 600;
  font-size: 0.9rem;
  color: #28A745; /* 成功绿色 */
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 150px;
}

.download-link {
  
  color: #3A7BBD; /* 主蓝色 */
  text-decoration: none;
  font-size: 0.7rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: all 0.2s;
  flex-shrink: 0;
}

.download-link:hover {
  text-decoration: underline;
  color: #2C5282;
}

.file-meta-container {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  margin-left: 10px;
}

.file-size {
  font-size: 0.75rem;
  color: #6C757D;
  font-weight: 500;
  background: #F8F9FA;
  padding: 2px 6px;
  border-radius: 6px;
  white-space: nowrap;
}

.file-format {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 6px;
  background: #EBF4FF;
  color: #3A7BBD; /* 主蓝色 */
  display: flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
}

.file-format.unknown {
  background: #FEF9E7;
  color: #D69E2E;
}

/* 状态和进度条容器 */
.status-progress-container {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  margin-left: auto;
}

.file-progress {
  width: 80px;
  flex-shrink: 0;
}

.progress-container {
  height: 6px;
  background: #E9ECEF;
  border-radius: 3px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, #3A7BBD, #4A90E2); /* 蓝色渐变 */
  border-radius: 3px;
  width: 0%;
  transition: width 0.4s ease;
  max-width: 100%;
}

.file-status {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
  white-space: nowrap;
  flex-shrink: 0;
}

.status-indicator {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 50px;
  min-width: 60px;
  text-align: center;
}

.status-queued {
  background: #FEF9E7;
  color: #D69E2E;
}

.status-processing {
  background: #EBF8FF;
  color: #3182CE;
}

.status-completed {
  background: #F0FFF4;
  color: #28A745; /* 成功绿色 */
}

.download-completed {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 50px;
  min-width: 60px;
  text-align: center;
}
 
.file-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.remove-btn {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  background: #FED7D7;
  border: none;
  color: #E53E3E;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  font-size: 0.8rem;
}

.remove-btn:hover {
  background: #E53E3E;
  color: white;
  transform: rotate(90deg);
}

.empty-message {
  text-align: center;
  padding: 25px;
  color: #6C757D;
  font-style: italic;
}

.footer-content{
   display: flex;
   font-size: 0.7rem;
   justify-content: center;     /* 改为居中对齐 */
   align-items: center;         /* 保持垂直居中 */
   padding: 10px 20px;
}

.footer-text {
  font-size: 0.8rem;
  color: #6C757D;
}


 
      /* 特性介绍  6个特性*/
    /*  
    .card-container {
      max-width: 1200px;
      width: 100%;
      margin: 0 auto;
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
       background: #F8F9FA;  
      border-top: 1px solid #E9ECEF; 
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.5rem;
    }

    .card {
      padding: 1.6rem 1.4rem;
        background: white;  
      border-radius: 6px;
      text-align: center;
      box-shadow: 0 2px 10px rgba(0,0,0,0.05);
      transition: transform 0.2s ease;
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: 0 6px 16px rgba(0,0,0,0.08);
    }

    .icon {
      font-size: 2rem;
      margin-bottom: 0.8rem;
    }

    .card h3 {
      font-size: 1.15rem;
      color: #1a1a1a;
      margin-bottom: 0.7rem;
    }

    .card p {
      font-size: 0.95rem;
      color: #666;
    }  */

/**转换器列表*/
.convert-container-list {
           max-width: 1400px;
          
            width: 100%;
            margin: 100px 0 1px;
            text-align: center;
            
}
 .list-header {
             
            width: 100%;
            margin: 0px 0 40px;
            text-align: center;
            color: #3A7BBD;
            font-size: 14px;
        }

 .convert-container {
            
            width: 100%;
            margin: 0px;
            background-color: #F9FAFB;
            border-radius: 6px;
            overflow: hidden;
            box-shadow: 0 8px 24px var(--shadow-color);
        }

        .convert-header {
            display: flex;
            width: 100%;
            font-weight: 300;
            padding: 16px 24px;
            font-size: 0.8em;
            border-bottom: 1px solid #e0e0e0;
            background-color: rgba(0, 0, 0, 0.02);
        }

        .col-header-hot, .col-hot {
            flex-basis: 8%;
            flex-shrink: 0;
            
            text-align: center;
            
        }
        
        .col-header-name, .col-name {
            flex-basis: 12%;
            flex-shrink: 0;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .col-header-category, .col-category {
            flex-basis: 12%;
            flex-shrink: 0;
            text-align: center;
        }

        .col-header-desc, .col-desc {
            flex-basis: 58%;
            flex-grow: 1;
            text-align: center;
        }

        .col-header-convert, .col-convert {
            flex-basis: 10%;
            flex-shrink: 0;
            text-align: center;
        }

        .convert-list-item {
            display: flex;
            align-items: center;
            padding: 18px 24px;
            border-bottom: 1px solid #f0f0f0;
            transition: background-color 0.2s ease-in-out;
 
             
            
        }
        
        #convert-list .convert-list-item:last-child {
            border-bottom: none;
        }
        
        .convert-list-item:hover {
            background-color: var(--bg-hover);
        }

        .hot-icon-group {
            display: flex;
            align-items: center;
            justify-content: center;
            line-height: 1;
        }

        .hot-icon-group svg {
            width: 16px;
            height: 16px;
            fill: #3A7BBD;
            margin: 0 1px;
        }

        .col-name h3 {
            font-size: 1.05em;
            font-weight: 400;
            color: inherit;
            margin: 0;
            padding: 0;
            display: inline-block;
            white-space: nowrap;
            text-align: right;
        }

        .convert-icon {
            width: 24px;
            height: 24px;
            margin-right: 12px;
            flex-shrink: 0;
            opacity: 0.8;
        }

        .category-tag {
            font-size: 0.8em;
            font-weight: 400;
            padding: 4px 8px;
            border-radius: 4px;
            white-space: nowrap;
            display: inline-block;
        }

        .tag-default {
            background-color: var(--tag-bg-default);
            color: var(--tag-text-default);
        }

        .tag-hot {
            background-color: var(--tag-bg-hot);
            color: var(--tag-text-hot);
        }

        .col-desc {
            color: var(--text-secondary);
            font-size: 0.8em;
        }

        .col-convert a {
            text-decoration: none;
            color: var(--brand-color);
            font-size: 0.8em;
            font-weight: 400;
            transition: color 0.2s ease-in-out;
            display: inline-flex;
            align-items: center;
        }
        
        .col-convert a::after {
           content: '→';
            color: #FF7A59;
            margin-left: 6px;
            transition: transform 0.2s ease;
            transform: scale(1.2);
            font-weight: bold;
        }
        
        .convert-list-item:hover .col-convert a::after {
            transform: translateX(3px);
        }

        /* 更多工具*/
        .tools-collapsible .tools-list-grid ul {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); /* 自动填充，每列至少180px */
            gap: 12px 20px; /* 行间距12px，列间距20px */
            margin: 0;
            padding: 20px 0 0 0; 
            list-style: none; /* 移除列表默认圆点 */
          }

          .tools-collapsible .tools-list-grid li {
            margin-bottom: 0; /* 因为用gap控制间距，这里设为0 */
          }

          .tools-collapsible .tools-list-grid a {
            display: block;
            padding: 10px 12px;
            background-color: #F9FAFB;
            border: 1px solid #e1e5eb;
            border-radius: 6px;
            text-decoration: none;
            color: #2d3748;
            font-size: 0.8em;
            transition: all 0.2s ease;
          }

          .tools-collapsible .tools-list-grid a:hover {
            background-color: #edf2f7;
            border-color: #cbd5e0;
            transform: translateY(-2px);
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
          }
        
        /* 底部信息栏样式 */
        .footer {
             
            border-top: 1px solid #e4e4e4;
            padding: 20px 0;
            margin-top: auto;
            text-align: center;
        }
        
        .footer-content {
          
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
        }
        
        .footer-links {
           
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            margin-bottom: 10px;
            gap: 10px;
        }
        
        .footer-links a {
            color: #c8c7c7;
            text-decoration: none;
            font-size: 12px;
            line-height: 1.8;
        }

        .footer-links span {
            color: #c8c7c7;
            text-decoration: none;
            font-size: 12px;
            line-height: 1.8;
        }
        
        .footer-links a:hover {
            color: #3A7BBD;
        }
        
        .footer-info {
           
            font-size: 12px;
            line-height: 1.5;
        }


/* 响应式设计 */
/* @media (max-width: 1200px) {
  .format-grid {
    grid-template-columns: repeat(6, 1fr);
  }

  .file-name-container {
    max-width: 35%;
  }

  .original-name {
    max-width: 140px;
  }

  .converted-name {
    max-width: 120px;
  }
} */
/* 
@media (max-width: 1000px) {
  .file-options {
    grid-template-columns: repeat(2, 1fr);
  }

  .format-grid {
    grid-template-columns: repeat(6, 1fr);
  }

  .file-info-main {
    flex-wrap: wrap;
    gap: 8px;
  }

  .file-meta-container {
    margin-left: 0;
  }
} */

@media (max-width: 1200px) {
    .file-options {
           display: grid;
           grid-template-columns: repeat(4, 1fr);
           gap: 5px;
           margin-bottom: 5px;
         }
  .top-section {
    flex-direction: column;
  }

  .left-section {
    border-right: none;
    border-bottom: 1px solid #E9ECEF;
  }

  .format-grid {
           grid-template-columns: repeat(9, 1fr);
           grid-template-rows: repeat(2, 1fr);
    }

  header h1 {
    font-size: 1.6rem;
  }

  .combined-item {
    flex-wrap: wrap;
    gap: 8px;
  }
 
  .file-info-main {
    width: 100%;
  }

   /**转换器列表*/
         .convert-container {
                margin: 0 20px 40px;
                border-radius: 8px;
            }
            
            .col-header-hot, .col-hot, .col-header-category, .col-category, .col-header-desc, .col-desc {
                display: none;
            }

            .col-header-name, .col-name {
                flex-basis: 50%;
            }
            
            .col-header-convert, .col-convert {
                flex-basis: 50%;
            }
            
            .convert-header, .convert-list-item {
                padding: 16px;
            }
}

@media (max-width: 700px) {
        .pc-only {
           display: none;
         }

         .small-screen-only {
           display: block;
         }

          .main-nav {
          width: 100%;
          padding: 0 20px; 
          display: flex;
          flex-wrap: nowrap;
          justify-content: space-between;  
       }

         .file-options {
           display: grid;
           grid-template-columns: repeat(4, 1fr);
           gap: 5px;
           margin-bottom: 5px;
         }

         .file-option {
           background: white;
           border: 2px solid #E2E8F0;
           border-radius: 6px;
           padding: 12px 6px;
           text-align: center;
           cursor: pointer;
           transition: all 0.3s ease;
           box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
           min-height: 60px;
           display: flex;
           flex-direction: column;
           justify-content: center;
           align-items: center;
         }

         .format-grid {
           grid-template-columns: repeat(9, 1fr);
           grid-template-rows: repeat(2, 1fr);
         }

         .format-buttons {
           display: flex;
           flex-wrap: wrap;
           flex-grow: 1;
           gap: 10px;
         }

         .format-btn {
           background: #E9ECEF;
           border: none;
           border-radius: 4px;
           padding: 5px 10px;
           color: #495057;
           cursor: pointer;
           font-weight: 400;
           transition: all 0.2s;
           box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
           font-size: 0.8rem;
         }

         /* 移动端文件队列布局优化 */
         .combined-item {
           padding: 12px;
           display: flex;
           flex-direction: column;
           gap: 8px;
           align-items: stretch;
           background: #F8F9FA;
         }

         /* 第一行：文件图标 + 原文件名 → 转换后文件名 */
         .mobile-file-row {
           display: flex;
           align-items: center;
           justify-content: space-between;
           gap: 8px;
         }

         .file-name-section {
           display: flex;
           align-items: center;
           gap: 6px;
           flex: 1;
           min-width: 0;
         }

         .original-name {
           font-weight: 600;
           font-size: 0.85rem;
           color: #2C3E50; /* 更深的标题颜色 */
           white-space: nowrap;
           overflow: hidden;
           text-overflow: ellipsis;
           max-width: 100px;
         }

         .conversion-arrow {
           color: #6C757D;
           font-size: 0.7rem;
           flex-shrink: 0;
         }

         .converted-name {
           font-weight: 600;
           font-size: 0.85rem;
           color: #28A745; /* 成功绿色 */
           white-space: nowrap;
           overflow: hidden;
           text-overflow: ellipsis;
           max-width: 100px;
         }

         /* 第二行：文件大小 + 格式 */
         .mobile-meta-row {
           display: flex;
           align-items: center;
           justify-content: space-between;
           gap: 10px;
         }

         .file-size {
           font-size: 0.7rem;
           color: #6C757D;
           font-weight: 500;
           background: #F8F9FA;
           padding: 2px 6px;
           border-radius: 6px;
           white-space: nowrap;
           background: #E9ECEF;
         }

         .file-format {
           font-size: 0.7rem;
           font-weight: 600;
           padding: 2px 6px;
           border-radius: 6px;
           background: #EBF4FF;
           color: #3A7BBD; /* 主蓝色 */
           display: flex;
           align-items: center;
           gap: 3px;
           white-space: nowrap;
         }

         /* 第三行：进度条独立显示 */
         .mobile-progress-row {
           display: flex;
           align-items: center;
           gap: 10px;
         }

         .file-progress {
           flex: 1;
         }

         .progress-container {
           height: 6px;
           background: #E9ECEF;
           border-radius: 3px;
           overflow: hidden;
         }

         .progress-bar {
           height: 100%;
           background: linear-gradient(90deg, #3A7BBD, #4A90E2); /* 蓝色渐变 */
           border-radius: 3px;
           width: 0%;
           transition: width 0.4s ease;
         }

         /* 第四行：状态 + 下载按钮 */
         .mobile-status-row {
           display: flex;
           align-items: center;
           justify-content: space-between;
           gap: 10px;
         }

         .status-indicator {
           font-size: 0.7rem;
           font-weight: 600;
           padding: 3px 8px;
           border-radius: 50px;
           text-align: center;
           flex: 1;
         }

         .download-link {
          display: flex;
        align-items: center;
        justify-content: center;
        gap: 4px;
        padding: 4px 8px;
        background-color: #3182CE;
        color: white;
        border-radius: 4px;
        text-decoration: none;
        font-size: 0.8rem;
        text-align: center;
           /* color: #3A7BBD;  
           text-decoration: none;
           font-size: 0.75rem;
           display: flex;
           align-items: center;
           gap: 4px;
           flex-shrink: 0;
           padding: 3px 8px;
           border-radius: 6px;
           background: #EBF4FF;
           transition: all 0.2s; */
         }

         .download-link:hover {
           background: #3A7BBD; /* 主蓝色 */
           color: white;
         }

         .remove-btn {
           position: absolute;
           top: 8px;
           right: 8px;
           width: 20px;
           height: 20px;
           border-radius: 50%;
           background: #FED7D7;
           border: none;
           color: #E53E3E;
           cursor: pointer;
           display: flex;
           align-items: center;
           justify-content: center;
           transition: all 0.2s;
           font-size: 0.7rem;
         }

         .remove-btn:hover {
           background: #E53E3E;
           color: white;
           transform: rotate(90deg);
         }

         

      .nav-container {
          flex-wrap: wrap; /* 允许子元素换行 */
          justify-content: center; /* 换行后居中对齐 */
          padding: 0 2px; /* 增加左右内边距防止贴边 */
        }

          /* .card-container {
        grid-template-columns: repeat(2, 1fr);
      } */

        .tools-collapsible .tools-list-grid ul {
          /* 布局优化：每行2列，间距更紧凑 */
          grid-template-columns: repeat(2, 1fr); /* 固定2列 */
          gap: 10px; /* 统一间距 */
          padding: 15px; /* 增加容器内边距 */
        }
        
        .tools-collapsible .tools-list-grid a {
          /* 触控优化：增大点击区域，简化样式 */
          padding: 12px 8px; /* 增加上下内边距 */
          min-height: 44px; /* 确保触控区域不小于44x44px */
          font-size: 0.85em; /* 略微缩小字体 */
          border-radius: 8px; /* 稍大的圆角更适合手指 */
          
          /* 简化悬停效果（手机上不明显） */
          transform: none;
          box-shadow: none;
        }
          
 

/* 修改500px以下的移动端样式 */
@media (max-width: 500px) {
       .pc-only {
         display: none;
       }

       .small-screen-only {
         display: block;
       }




     .nav-container {
         display: flex;
          flex-wrap: nowrap;
         justify-content: space-between;

         width: 100%;
         padding: 0 10px;
         }
     .logo-section {
            display: flex;
            align-items: center;
            gap: 10px;
        }
      .logo {
        gap: 2px;
        font-size: 16px;
        font-weight: 600;

        }
     .nav-right {
            display: flex;
            align-items: center;
            justify-content: flex-end;
            flex: 1;
            gap: 4px; /* 推荐使用 gap 而不是 margin */
            padding: 0 4px;
            min-width: 0; /* 防止 flex 容器溢出 */
        }
      .user-info {
              display: flex;
              align-items: center;
              gap: 2px;
          }
      .my-files {
              display: flex;
              align-items: center;
              padding: 6px 12px;
              font-size: 12px;
              white-space: nowrap; /* 防止“我的文件”换行 */
              gap: 4px;
              }
      .my-files svg {
      flex-shrink: 0;
      } 
       .file-count-badge {

            padding: 2px 6px;

        }
       .file-options {
         display: grid;
         grid-template-columns: repeat(4, 1fr);
         gap: 5px;
         margin-bottom: 5px;
       }

       .file-option {
         background: white;
         border: 2px solid #E2E8F0;
         border-radius: 6px;
         padding: 12px 6px;
         text-align: center;
         cursor: pointer;
         transition: all 0.3s ease;
         box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
         min-height: 60px;
         display: flex;
         flex-direction: column;
         justify-content: center;
         align-items: center;
       }
      .auth-buttons {
                padding: 0px 0px 0px 8px;

                gap: 8px;
                white-space: nowrap;
        }
      
        .common-btn {
            background: linear-gradient(135deg, #2ECC71 0%, #1ABC9C 100%);
            color: white !important;
             padding: 6px 12px;
            font-size: 12px;
            border-radius: 6px;
            transition: all 0.3s ease;
            box-shadow: 0 2px 8px rgba(46, 204, 113, 0.3);
            border: none !important;
            outline: none !important;
            white-space: nowrap;
        }


         .mobile-menu {
            display: flex; /* 小屏下显示 */
          }

          /* 可选：让 sub-nav 可横向滚动（适合超多菜单） */
          .mobile-menu {
            overflow-x: auto;
            justify-content: center;
            gap: 16px;
            padding: 8px 16px;

          }

          .mobile-menu a {
            flex: 0 0 auto;
          }


       .format-grid {
         grid-template-columns: repeat(4, 1fr);
         grid-template-rows: repeat(2, 1fr);
       }

       .format-buttons {
         display: flex;
         flex-wrap: wrap;
         flex-grow: 1;
         gap: 10px;
       }

       .format-btn {
         background: #E9ECEF;
         border: none;
         border-radius: 4px;
         padding: 5px 10px;
         color: #495057;
         cursor: pointer;
         font-weight: 400;
         transition: all 0.2s;
         box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
         font-size: 0.8rem;
       }

       /* 移动端文件队列布局优化 */
       .combined-item {
         padding: 12px;
         display: flex;
         flex-direction: column;
         gap: 8px;
         align-items: stretch;
         background: #F8F9FA;
       }

       /* 第一行：文件图标 + 原文件名 → 转换后文件名 */
       .mobile-file-row {
         display: flex;
         align-items: center;
         justify-content: space-between;
         gap: 8px;
       }

       .file-name-section {
         display: flex;
         align-items: center;
         gap: 6px;
         flex: 1;
         min-width: 0;
       }

       .original-name {
         font-weight: 600;
         font-size: 0.85rem;
         color: #2C3E50; /* 更深的标题颜色 */
         white-space: nowrap;
         overflow: hidden;
         text-overflow: ellipsis;
         max-width: 100px;
       }

       .conversion-arrow {
         color: #6C757D;
         font-size: 0.7rem;
         flex-shrink: 0;
       }

       .converted-name {
         font-weight: 600;
         font-size: 0.85rem;
         color: #28A745; /* 成功绿色 */
         white-space: nowrap;
         overflow: hidden;
         text-overflow: ellipsis;
         max-width: 100px;
       }

       /* 第二行：文件大小 + 格式 */
       .mobile-meta-row {
         display: flex;
         align-items: center;
         justify-content: space-between;
         gap: 10px;
       }

       .file-size {
         font-size: 0.7rem;
         color: #6C757D;
         font-weight: 500;
         background: #F8F9FA;
         padding: 2px 6px;
         border-radius: 6px;
         white-space: nowrap;
         background: #E9ECEF;
       }

       .file-format {
         font-size: 0.7rem;
         font-weight: 600;
         padding: 2px 6px;
         border-radius: 6px;
         background: #EBF4FF;
         color: #3A7BBD; /* 主蓝色 */
         display: flex;
         align-items: center;
         gap: 3px;
         white-space: nowrap;
       }

       /* 第三行：进度条独立显示 */
       .mobile-progress-row {
         display: flex;
         align-items: center;
         gap: 10px;
       }

       .file-progress {
         flex: 1;
       }

       .progress-container {
         height: 6px;
         background: #E9ECEF;
         border-radius: 3px;
         overflow: hidden;
       }

       .progress-bar {
         height: 100%;
         background: linear-gradient(90deg, #3A7BBD, #4A90E2); /* 蓝色渐变 */
         border-radius: 3px;
         width: 0%;
         transition: width 0.4s ease;
       }

       /* 第四行：状态 + 下载按钮 */
       .mobile-status-row {
         display: flex;
         align-items: center;
         justify-content: space-between;
         gap: 10px;
       }

       .status-indicator {
         font-size: 0.7rem;
         font-weight: 600;
         padding: 3px 8px;
         border-radius: 50px;
         text-align: center;
         flex: 1;
       }

       .download-link {
         color: #3A7BBD; /* 主蓝色 */
         text-decoration: none;
         font-size: 0.75rem;
         display: flex;
         align-items: center;
         gap: 4px;
         flex-shrink: 0;
         padding: 3px 8px;
         border-radius: 6px;
         background: #EBF4FF;
         transition: all 0.2s;
       }

       .download-link:hover {
         background: #3A7BBD; /* 主蓝色 */
         color: white;
       }

       .remove-btn {
         position: absolute;
         top: 8px;
         right: 8px;
         width: 20px;
         height: 20px;
         border-radius: 50%;
         background: #FED7D7;
         border: none;
         color: #E53E3E;
         cursor: pointer;
         display: flex;
         align-items: center;
         justify-content: center;
         transition: all 0.2s;
         font-size: 0.7rem;
       }

       .remove-btn:hover {
         background: #E53E3E;
         color: white;
         transform: rotate(90deg);
       }

       /* 隐藏原有的复杂布局 */
       .file-info-main,
       .file-meta-container,
       .status-progress-container,
       .file-status,
       .file-actions {
         display: none;
       }

    .nav-container {
        flex-wrap: wrap; /* 允许子元素换行 */
        justify-content: center; /* 换行后居中对齐 */
        padding: 0 2px; /* 增加左右内边距防止贴边 */
      }

       .main-content-convert {
           padding: 0px 20px 10px;
         }

   }