0deg); }
            100% { transform: rotate(360deg); }
        }
        
        .loading-text {
            color: #606266;
            font-size: 16px;
        }
    </style>
</head>
<body>
    <div id="app">
        <div class="loading">
            <div class="spinner"></div>
            <div class="loading-text">正在加载PDF预览...</div>
        </div>
    </div>
    
    <script>
        // 获取URL参数
        function getUrlParam(name) {
            const urlParams = new URLSearchParams(w