* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --primary-color: #2563eb;
            --secondary-color: #64748b;
            --bg-color: #f8fafc;
            --card-bg: #ffffff;
            --border-color: #e2e8f0;
            --text-color: #334155;
            --text-secondary: #64748b;
            --success-color: #10b981;
            --warning-color: #f59e0b;
            --error-color: #ef4444;
            --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            background-color: var(--bg-color);
            color: var(--text-color);
            line-height: 1.6;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }

        /* 头部样式 */
        .header {
            background: var(--card-bg);
            border-radius: 12px;
            padding: 20px;
            margin-bottom: 24px;
            box-shadow: var(--shadow);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .header h1 {
            font-size: 24px;
            color: var(--primary-color);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .user-info {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            overflow: hidden;
            border: 2px solid var(--border-color);
        }

        .avatar img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .username {
            font-weight: 500;
        }

        .login-prompt {
            background: var(--warning-color);
            color: white;
            padding: 10px 16px;
            border-radius: 8px;
            font-weight: 500;
        }

        /* 面包屑导航 */
        .breadcrumb {
            background: var(--card-bg);
            border-radius: 12px;
            padding: 16px 20px;
            margin-bottom: 24px;
            box-shadow: var(--shadow);
        }

        .breadcrumb ol {
            list-style: none;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .breadcrumb li {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .breadcrumb a {
            color: var(--secondary-color);
            text-decoration: none;
            transition: color 0.2s;
        }

        .breadcrumb a:hover {
            color: var(--primary-color);
        }

        .breadcrumb .separator {
            color: var(--text-secondary);
            font-size: 12px;
        }

        /* 文件列表容器 */
        .file-list-container {
            background: var(--card-bg);
            border-radius: 12px;
            padding: 24px;
            box-shadow: var(--shadow);
            margin-bottom: 24px;
        }

        .file-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
            padding-bottom: 16px;
            border-bottom: 1px solid var(--border-color);
        }

        .file-header h2 {
            font-size: 18px;
            color: var(--text-color);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .sort-options {
            display: flex;
            gap: 12px;
        }

        .sort-btn {
            padding: 8px 16px;
            background: var(--bg-color);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            color: var(--text-secondary);
            cursor: pointer;
            font-size: 14px;
            transition: all 0.2s;
        }

        .sort-btn.active {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }

        .sort-btn:hover {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }

        /* 文件列表 */
        .file-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
            gap: 16px;
        }

        .file-item {
            background: var(--bg-color);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 16px;
            transition: all 0.2s;
            cursor: pointer;
            position: relative;
        }

        .file-item:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary-color);
        }

        .file-icon {
            width: 48px;
            height: 48px;
            margin: 0 auto 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            border-radius: 12px;
            color: white;
            font-size: 24px;
        }

        .file-icon.folder {
            background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
        }

        .file-name {
            font-weight: 500;
            margin-bottom: 8px;
            text-align: center;
            word-break: break-word;
            line-height: 1.4;
        }

        .file-meta {
            display: flex;
            justify-content: space-between;
            font-size: 12px;
            color: var(--text-secondary);
        }

        .file-size {
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        .file-date {
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        .file-actions {
            position: absolute;
            top: 8px;
            right: 8px;
            display: none;
        }

        .file-item:hover .file-actions {
            display: flex;
            gap: 4px;
        }

        .action-btn {
            width: 28px;
            height: 28px;
            border-radius: 6px;
            background: white;
            border: 1px solid var(--border-color);
            color: var(--text-secondary);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.2s;
        }

        .action-btn:hover {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }

        /* 加载状态 */
        .loading {
            text-align: center;
            padding: 40px;
            color: var(--text-secondary);
        }

        .loading-spinner {
            width: 40px;
            height: 40px;
            border: 3px solid var(--border-color);
            border-top-color: var(--primary-color);
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin: 0 auto 16px;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        /* 下载托盘 */
        .download-tray {
            position: fixed;
            bottom: 20px;
            right: 20px;
            width: 300px;
            background: var(--card-bg);
            border-radius: 12px;
            box-shadow: var(--shadow-lg);
            border: 1px solid var(--border-color);
            overflow: hidden;
            z-index: 1000;
            display: none;
        }

        .tray-header {
            background: var(--primary-color);
            color: white;
            padding: 12px 16px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
        }

        .tray-header h3 {
            font-size: 14px;
            font-weight: 500;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .tray-count {
            background: white;
            color: var(--primary-color);
            width: 20px;
            height: 20px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 12px;
            font-weight: 600;
        }

        .tray-toggle {
            background: none;
            border: none;
            color: white;
            cursor: pointer;
            padding: 4px;
        }

        .tray-content {
            max-height: 400px;
            overflow-y: auto;
            padding: 0;
        }

        .download-item {
            padding: 12px 16px;
            border-bottom: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .download-item:last-child {
            border-bottom: none;
        }

        .download-icon {
            width: 32px;
            height: 32px;
            background: var(--bg-color);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary-color);
        }

        .download-info {
            flex: 1;
            min-width: 0;
        }

        .download-name {
            font-weight: 500;
            font-size: 14px;
            margin-bottom: 2px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .download-progress {
            font-size: 12px;
            color: var(--text-secondary);
        }

        .download-status {
            width: 16px;
            height: 16px;
            border-radius: 50%;
        }

        .download-status.pending {
            background: var(--warning-color);
            animation: pulse 1.5s infinite;
        }

        .download-status.downloading {
            background: var(--primary-color);
            animation: spin 1s linear infinite;
        }

        .download-status.success {
            background: var(--success-color);
        }

        .download-status.error {
            background: var(--error-color);
        }

        @keyframes pulse {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.5; }
        }

        /* 空状态 */
        .empty-state {
            text-align: center;
            padding: 40px 20px;
            color: var(--text-secondary);
        }

        .empty-icon {
            font-size: 48px;
            margin-bottom: 16px;
            color: var(--border-color);
        }

        /* 响应式设计 */
        @media (max-width: 768px) {
            .container {
                padding: 12px;
            }
            
            .header {
                flex-direction: column;
                gap: 16px;
                text-align: center;
            }
            
            .file-list {
                grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
            }
            
            .download-tray {
                width: calc(100% - 40px);
                right: 20px;
                left: 20px;
            }
        }

        /* 工具提示 */
        .tooltip {
            position: relative;
            display: inline-block;
        }

        .tooltip .tooltiptext {
            visibility: hidden;
            width: 120px;
            background-color: var(--text-color);
            color: white;
            text-align: center;
            border-radius: 6px;
            padding: 5px;
            position: absolute;
            z-index: 1;
            bottom: 125%;
            left: 50%;
            margin-left: -60px;
            opacity: 0;
            transition: opacity 0.3s;
            font-size: 12px;
        }

        .tooltip:hover .tooltiptext {
            visibility: visible;
            opacity: 1;
        }