* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
            background: #f8fafc;
            color: #333;
            line-height: 1.6;
        }
        
        /* 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;
        }
        
        .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;
        }
        
        /* 顶部大图 */
        .ht-pdf-hero {
            height: 400px;
            background: linear-gradient(135deg, #0a0e17 0%, #1a2438 100%);
            margin-top: 70px;
            position: relative;
            overflow: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .ht-pdf-hero-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('https://images.unsplash.com/photo-1551288049-bebda4e38f71?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover;
            opacity: 0.3;
        }
        
        .ht-pdf-hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            color: white;
            max-width: 800px;
            padding: 0 20px;
        }
        
        .ht-pdf-hero-title {
            font-size: 3rem;
            font-weight: 300;
            margin-bottom: 20px;
            background: linear-gradient(135deg, #fff 0%, #ff6b7a 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        
        .ht-pdf-hero-subtitle {
            font-size: 1.1rem;
            color: #b0b7c3;
            margin-bottom: 30px;
        }
        
        /* PDF样册列表 */
        .ht-pdf-sample-list {
            padding: 60px 5%;
            background: #fff;
        }
        
        .ht-pdf-section-title {
            font-size: 2rem;
            font-weight: 300;
            text-align: center;
            margin-bottom: 40px;
            color: #1a2438;
        }
        
        .ht-pdf-samples-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
            gap: 30px;
            max-width: 1400px;
            margin: 0 auto;
        }
        
        .ht-pdf-sample-item {
            background: #fff;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            transition: all 0.4s ease;
            cursor: pointer;
            opacity: 0;
            transform: translateY(20px);
            animation: ht-pdf-fadeInUp 0.6s ease forwards;
            border: 1px solid #f0f0f0;
            position: relative;
        }
        
        .ht-pdf-sample-item::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(8px);
            opacity: 0;
            transition: opacity 0.3s ease;
            z-index: 2;
            pointer-events: none;
            border-radius: 15px;
        }
        
        .ht-pdf-sample-item:hover {
            transform: translateY(-8px) scale(1.02);
            box-shadow: 0 20px 40px rgba(164, 22, 38, 0.15);
            border-color: rgba(164, 22, 38, 0.2);
        }
        
        .ht-pdf-sample-item:hover::before {
            opacity: 1;
        }
        
        .ht-pdf-sample-item:hover .ht-pdf-sample-title {
            color: #a41626;
            transform: translateY(-3px);
        }
        
        .ht-pdf-sample-image {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-bottom: 1px solid #f0f0f0;
            transition: transform 0.4s ease;
        }
        
        .ht-pdf-sample-item:hover .ht-pdf-sample-image {
            transform: scale(1.05);
        }
        
        .ht-pdf-sample-content {
            padding: 25px;
            position: relative;
            z-index: 3;
        }
        
        .ht-pdf-sample-title {
            font-size: 1.3rem;
            font-weight: 600;
            color: #1a2438;
            margin-bottom: 12px;
            transition: all 0.3s ease;
            line-height: 1.4;
        }
        
        .ht-pdf-sample-desc {
            color: #666;
            font-size: 0.95rem;
            line-height: 1.5;
            margin-bottom: 15px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        
        .ht-pdf-sample-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 15px;
            padding-top: 15px;
            border-top: 1px solid #f0f0f0;
        }
        
        .ht-pdf-sample-date {
            color: #888;
            font-size: 0.85rem;
        }
        
        .ht-pdf-sample-size {
            color: #ff6b7a;
            font-size: 0.85rem;
            font-weight: 600;
        }
        
        .ht-pdf-sample-category {
            display: inline-block;
            background: rgba(164, 22, 38, 0.1);
            color: #a41626;
            padding: 4px 12px;
            border-radius: 15px;
            font-size: 0.8rem;
            margin-bottom: 10px;
        }
        
        /* 加载动画 */
        @keyframes ht-pdf-fadeInUp {
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        /* 响应式设计 */
        @media (max-width: 1024px) {
            .ht-pdf-hero-title {
                font-size: 2.5rem;
            }
            
            .ht-pdf-samples-grid {
                grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            }
        }
        
        @media (max-width: 768px) {
            .ht-pdf-nav {
                padding: 0 20px;
            }
            
            .ht-pdf-nav-links {
                display: none;
            }
            
            .ht-pdf-mobile-menu {
                display: block;
            }
            
            .ht-pdf-hero {
                height: 300px;
            }
            
            .ht-pdf-hero-title {
                font-size: 2rem;
            }
            
            .ht-pdf-section-title {
                font-size: 1.7rem;
            }
            
            .ht-pdf-samples-grid {
                grid-template-columns: 1fr;
            }
        }
        
        @media (max-width: 480px) {
            .ht-pdf-hero {
                height: 250px;
            }
            
            .ht-pdf-hero-title {
                font-size: 1.8rem;
            }
            
            .ht-pdf-sample-content {
                padding: 20px;
            }
        }