* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
            background: #fff;
            color: #333;
            line-height: 1.6;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        
        /* 隐藏滚动条 */
        body::-webkit-scrollbar {
            display: none;
        }
        
        body {
            -ms-overflow-style: none;
            scrollbar-width: none;
        }
        
        /* 导航栏 */
        .ht-pdf-nav {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            padding: 0 5%;
            height: 70px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
        }
        
        .ht-pdf-logo {
            font-size: 1.5rem;
            font-weight: 700;
            color: #a41626;
            cursor: pointer;
        }
        
        .ht-pdf-nav-links {
            display: flex;
            gap: 40px;
        }
        
        .ht-pdf-nav-link {
            color: #333;
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s ease;
        }
        
        .ht-pdf-nav-link:hover {
            color: #a41626;
        }
        
        .ht-pdf-mobile-menu {
            display: none;
            font-size: 1.5rem;
            cursor: pointer;
        }
        
        /* 主要内容区域 */
        .ht-pdf-main {
            flex: 1;
            margin-top: 70px; /* 为固定导航栏留出空间 */
            display: flex;
            flex-direction: column;
            min-height: calc(100vh - 70px); /* 减去导航栏高度 */
        }
        
        /* PDF全屏显示 */
        .ht-pdf-fullscreen {
            width: 100%;
            flex: 1;
            background: #fff;
            display: flex;
            flex-direction: column;
        }
        
        .ht-pdf-fullscreen-header {
            background: #fff;
            padding: 15px 20px;
            border-bottom: 1px solid #eaeaea;
            display: flex;
            justify-content: space-between;
            align-items: center;
            min-height: 70px;
        }
        
        .ht-pdf-fullscreen-title {
            font-size: 1.2rem;
            font-weight: 600;
            color: #1a2438;
        }
        
        .ht-pdf-controls {
            display: flex;
            gap: 15px;
        }
        
        .ht-pdf-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #a41626;
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 25px;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all 0.3s ease;
            text-decoration: none;
        }
        
        .ht-pdf-btn:hover {
            background: #c21827;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(164, 22, 38, 0.3);
        }
        
        .ht-pdf-btn.secondary {
            background: #fff;
            color: #a41626;
            border: 2px solid #a41626;
        }
        
        .ht-pdf-btn.secondary:hover {
            background: #a41626;
            color: white;
        }
        
        .ht-pdf-fullscreen-viewer {
            flex: 1;
            width: 100%;
            border: none;
            background: #fff;
            min-height: calc(100vh - 140px - 200px); /* 减去头部和footer的预估高度 */
        }
        
        /* Footer样式 - 固定在底部但不遮挡内容 */
        .ht-pdf-footer {
            background: #1a2438;
            color: white;
            padding: 40px 5%;
            width: 100%;
            /* 移除固定定位，让它在文档流中 */
        }
        
        .ht-pdf-footer-content {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
        }
        
        .ht-pdf-footer-section h3 {
            font-size: 1.2rem;
            margin-bottom: 20px;
            color: #fff;
        }
        
        .ht-pdf-footer-section p, 
        .ht-pdf-footer-section a {
            color: #b0b7c3;
            margin-bottom: 10px;
            display: block;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        
        .ht-pdf-footer-section a:hover {
            color: #a41626;
        }
        
        .ht-pdf-footer-bottom {
            max-width: 1200px;
            margin: 30px auto 0;
            padding-top: 20px;
            border-top: 1px solid #2d3748;
            text-align: center;
            color: #b0b7c3;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .ht-pdf-nav {
                padding: 0 20px;
            }
            
            .ht-pdf-nav-links {
                display: none;
            }
            
            .ht-pdf-mobile-menu {
                display: block;
            }
            
            .ht-pdf-controls {
                gap: 10px;
            }
            
            .ht-pdf-btn {
                padding: 8px 15px;
                font-size: 0.8rem;
            }
            
            .ht-pdf-footer-content {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            
            .ht-pdf-fullscreen-viewer {
                min-height: calc(100vh - 140px - 250px); /* 移动端调整高度 */
            }
        }
        
        @media (max-width: 480px) {
            .ht-pdf-fullscreen-title {
                font-size: 1rem;
            }
            
            .ht-pdf-btn {
                padding: 6px 12px;
                font-size: 0.75rem;
            }
            
            .ht-pdf-controls {
                flex-direction: column;
                gap: 5px;
            }
            
            .ht-pdf-footer {
                padding: 30px 20px;
            }
            
            .ht-pdf-fullscreen-viewer {
                min-height: calc(100vh - 140px - 280px); /* 小屏幕调整高度 */
            }
        }