/* PDF下载容器样式 */
        .pdf-container {
            display: flex;
            flex-direction: column;
            align-items: center;
            max-width: 800px;
            margin: 0 auto;
            padding-top: 25px;
            perspective: 1000px;
        }
        
        .pdf-preview {
            position: relative;
            width: 100%;
            max-width: 500px;
            height: 300px;
            margin-bottom: 30px;
            border-radius: 20px;
            overflow: hidden;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
            transform-style: preserve-3d;
            transition: transform 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275);
        }
        
        .pdf-preview:hover {
            transform: translateY(-10px) rotateX(5deg);
        }
        
        .pdf-preview img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s;
        }
        
        .pdf-preview:hover img {
            transform: scale(1.05);
        }
        
        .pdf-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(to bottom, rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0.7));
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            transition: opacity 0.5s;
        }
        
        .pdf-preview:hover .pdf-overlay {
            opacity: 1;
        }
        
        .preview-text {
            font-size: 1.8rem;
            font-weight: bold;
            color: white;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
        }
        
        .pdf-download {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 100%;
            max-width: 500px;
            padding: 20px 30px;
            background: linear-gradient(90deg, #0c2461, #1e3799);
            border-radius: 15px;
            text-decoration: none;
            box-shadow: 0 10px 25px rgba(28, 55, 153, 0.4);
            transition: all 0.4s ease;
            position: relative;
            overflow: hidden;
        }
        
        .pdf-download::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
            transition: left 0.7s;
        }
        
        .pdf-download:hover::before {
            left: 100%;
        }
        
        .pdf-download:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(28, 55, 153, 0.6);
            background: linear-gradient(90deg, #0c2461, #273c75);
        }
        
        .pdf-download:active {
            transform: translateY(0);
            box-shadow: 0 5px 15px rgba(28, 55, 153, 0.4);
        }
        
        .pdf-icon {
            font-size: 2.5rem;
            margin-right: 20px;
            color: #ff9f43;
            filter: drop-shadow(0 2px 5px rgba(0, 0, 0, 0.3));
        }
        
        .pdf-info {
            flex: 1;
        }
        
        .pdf-title {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 5px;
            color: white;
        }
        
        .pdf-subtitle {
            font-size: 0.95rem;
            color: #d1d8e0;
            opacity: 0.9;
        }
        
        .download-btn {
            background: linear-gradient(90deg, #ff9f43, #ffaf60);
            color: #fff;
            border: none;
            padding: 12px 25px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1.1rem;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 5px 15px rgba(255, 159, 67, 0.4);
            transition: all 0.3s;
        }
        
        .download-btn i {
            margin-right: 8px;
            font-size: 1.2rem;
        }
        
        .download-btn:hover {
            background: linear-gradient(90deg, #ffaf60, #ff9f43);
            box-shadow: 0 8px 20px rgba(255, 159, 67, 0.6);
            transform: scale(1.05);
        }
        
        /* 动画效果 */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .pdf-container {
            animation: fadeInUp 0.8s ease-out 0.3s both;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            h1 {
                font-size: 2rem;
            }
            
            .pdf-preview {
                height: 250px;
            }
            
            .pdf-download {
                flex-direction: column;
                text-align: center;
                padding: 25px 20px;
            }
            
            .pdf-icon {
                margin-right: 0;
                margin-bottom: 15px;
                font-size: 3rem;
            }
            
            .pdf-info {
                margin-bottom: 20px;
            }
            
            .pdf-title {
                font-size: 1.4rem;
            }
            
            .preview-text {
                font-size: 1.5rem;
            }
        }
        
        @media (max-width: 480px) {
            h1 {
                font-size: 1.8rem;
            }
            
            .pdf-preview {
                height: 200px;
                border-radius: 15px;
            }
            
            .pdf-download {
                padding: 20px 15px;
            }
            
            .pdf-title {
                font-size: 1.3rem;
            }
            
            .download-btn {
                padding: 10px 20px;
                font-size: 1rem;
            }
        }
        
        /* 额外样式：下载计数器 */
        .download-stats {
            display: flex;
            justify-content: center;
            margin-top: 30px;
            color: #a0a0c0;
            font-size: 0.9rem;
        }
        
        .download-count {
            margin-left: 5px;
            font-weight: bold;
            color: #ff9f43;
        }
        
        /* 加载动画 */
        .loader {
            display: none;
            width: 50px;
            height: 50px;
            border: 5px solid rgba(255, 255, 255, 0.2);
            border-radius: 50%;
            border-top-color: #ff9f43;
            animation: spin 1s linear infinite;
            margin: 20px auto;
        }
        
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }