/* 下载按钮样式 */
        .download-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background-color: #014998;
            color: white;
            padding: 15px 35px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 18px;
            cursor: pointer;
            transition: all 0.3s ease;
            text-decoration: none;
            border: none;
            outline: none;
            position: relative;
            overflow: hidden;
            box-shadow: 0 4px 0 #1a277a;
            margin-bottom: 30px;
        }
        
        .download-btn:hover {
            background-color: #2980b9;
            transform: translateY(-3px);
            box-shadow: 0 6px 0 #2472a4;
        }
        
        .download-btn:active {
            transform: translateY(1px);
            box-shadow: 0 2px 0 #2472a4;
        }
        
        .download-btn i {
            margin-right: 12px;
            font-size: 22px;
        }
        
        /* 下载指示器 */
        .download-indicator {
            display: none;
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(255, 255, 255, 0.95);
            border-radius: 8px;
            align-items: center;
            justify-content: center;
            flex-direction: column;
        }
        
        .spinner {
            width: 30px;
            height: 30px;
            border: 3px solid rgba(52, 152, 219, 0.3);
            border-radius: 50%;
            border-top-color: #3498db;
            animation: spin 1s ease-in-out infinite;
            margin-bottom: 10px;
        }
        
        @keyframes spin {
            to { transform: rotate(360deg); }
        }
        
      
        
        /* 下载完成提示 */
        .download-complete {
            display: none;
            background-color: #2ecc71;
            color: white;
            padding: 12px 20px;
            border-radius: 6px;
            margin-top: 20px;
            animation: fadeIn 0.5s;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(-10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .download-complete i {
            margin-right: 8px;
        }
        
        /* 响应式调整 */
        @media (max-width: 600px) {
            .container {
                padding: 30px 20px;
            }
            
            h1 {
                font-size: 1.7rem;
            }
            
            .download-btn {
                padding: 14px 28px;
                font-size: 16px;
            }
        }