*{margin:0;padding:0;box-sizing:border-box}html{overflow-x:hidden;width:100%}body{font-family:Noto Sans SC,Microsoft YaHei,sans-serif;line-height:1.6;color:#333;background-color:#f5f7fa;width:100%;overflow-x:hidden}.top-nav{background:#fff;border-bottom:1px solid #e9ecef;position:sticky;top:0;z-index:100;box-shadow:0 2px 10px #0000000d}.nav-container{max-width:1200px;margin:0 auto;padding:0 20px;display:flex;justify-content:space-between;align-items:center;height:60px}.nav-logo{font-size:1.1rem;font-weight:700;color:#3498db;text-decoration:none}.nav-links{display:flex;gap:20px}.nav-link{color:#7f8c8d;text-decoration:none;font-size:.95rem;transition:color .3s;padding:8px 0;border-bottom:2px solid transparent}.nav-link:hover,.nav-link.active{color:#3498db;border-bottom-color:#3498db}.nav-toggle{display:none;flex-direction:column;justify-content:space-between;width:28px;height:20px;cursor:pointer;padding:0}.nav-toggle 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#3498db33}.search-box::placeholder{color:#95a5a6}.search-icon{position:absolute;left:25px;top:50%;transform:translateY(-50%);font-size:1.3rem}.stats{display:flex;justify-content:center;gap:40px;margin-bottom:40px;flex-wrap:wrap}.stat-item{text-align:center;padding:20px 35px;background:#fff;border-radius:15px;box-shadow:0 4px 15px #00000014}.stat-value{font-size:2.5rem;font-weight:700;color:#3498db}.stat-label{font-size:.9rem;color:#7f8c8d;margin-top:5px}.virtual-scroll-container{height:calc(100vh - 300px);overflow-y:auto;position:relative;max-width:1400px;margin:0 auto;width:100%;overflow-x:hidden}.virtual-scroll-spacer{position:relative}.book-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:25px;padding:0 20px 40px;box-sizing:border-box}.book-card{background:#fff;border-radius:20px;padding:25px;cursor:pointer;transition:transform .2s ease,box-shadow .2s ease;border:1px solid #e9ecef;height:160px;box-sizing:border-box;box-shadow:0 4px 15px #00000014;position:relative}.book-card:hover{transform:translateY(-5px);box-shadow:0 8px 25px #0000001f}.book-title-zh{font-size:1.15rem;font-weight:600;margin-bottom:8px;color:#2c3e50;line-height:1.3;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}.book-title-en{font-size:.9rem;color:#7f8c8d;margin-bottom:15px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.book-meta{display:flex;justify-content:space-between;align-items:center;margin-top:auto}.book-duration{display:flex;align-items:center;gap:8px;color:#95a5a6;font-size:.85rem}.book-duration-icon{font-size:1rem}.book-price{font-size:1.3rem;font-weight:700;color:#3498db}.book-price span{font-size:.85rem;font-weight:400;color:#7f8c8d}.book-qq{position:absolute;top:15px;right:15px;padding:5px 10px;background:#12b7f5;color:#fff;border-radius:5px;font-size:.8rem;font-weight:600;cursor:pointer;transition:transform .2s,background 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#00000014;text-align:center}.qrcode-section h2{font-size:1.5rem;color:#2c3e50;margin-bottom:25px}.qrcode-img{width:220px;height:220px;border-radius:15px;box-shadow:0 8px 30px #0000001f;margin-bottom:20px;object-fit:cover}.qrcode-tip{color:#7f8c8d;font-size:.95rem}.contact-list{background:#fff;border-radius:20px;padding:35px;box-shadow:0 10px 40px #00000014}.contact-list h2{font-size:1.5rem;color:#2c3e50;margin-bottom:30px;text-align:center}.contact-item{display:flex;align-items:center;gap:20px;padding:20px 0;border-bottom:1px solid #f0f0f0}.contact-item:last-child{border-bottom:none}.contact-icon{width:50px;height:50px;background:linear-gradient(135deg,#3498db,#2980b9);border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.3rem;flex-shrink:0}.contact-info h3{font-size:1rem;color:#2c3e50;margin-bottom:5px}.contact-info p{color:#7f8c8d;font-size:.95rem}.contact-info a{color:#3498db;text-decoration:none;transition:color .3s}.contact-info a:hover{color:#2980b9;text-decoration:underline}.pricing-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:30px;margin-bottom:60px}.pricing-card{background:#fff;border-radius:20px;padding:35px;box-shadow:0 10px 40px #00000014;text-align:center;transition:transform .3s,box-shadow .3s;position:relative;overflow:hidden}.pricing-card:hover{transform:translateY(-5px);box-shadow:0 15px 50px #0000001f}.pricing-card.featured{border:2px solid #3498db}.pricing-card.featured:before{content:"推荐";position:absolute;top:15px;right:-30px;background:#3498db;color:#fff;padding:5px 40px;font-size:.8rem;transform:rotate(45deg)}.pricing-badge{display:inline-block;padding:6px 15px;border-radius:20px;font-size:.85rem;font-weight:600;margin-bottom:20px}.badge-pdf-us{background:#e8f4fd;color:#3498db}.badge-pdf-uk{background:#fef5e7;color:#f39c12}.badge-pdf-300{background:#e8fce8;color:#27ae60}.badge-bundle{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.pricing-card h3{font-size:1.4rem;color:#2c3e50;margin-bottom:15px}.pricing-card .description{color:#7f8c8d;font-size:.95rem;margin-bottom:25px;min-height:50px}.price{font-size:2.8rem;font-weight:700;color:#2c3e50;margin-bottom:5px}.price-note{font-size:.9rem;color:#95a5a6;margin-bottom:25px}.pricing-btn{display:inline-block;padding:12px 30px;background:#3498db;color:#fff;text-decoration:none;border-radius:25px;font-weight:600;transition:background .3s,transform .2s}.pricing-btn:hover{background:#2980b9;transform:translateY(-2px)}.pricing-btn.qq{background:#12b7f5}.pricing-btn.qq:hover{background:#0fa3e8}.features-section{background:#fff;border-radius:20px;padding:50px;box-shadow:0 10px 40px #00000014}.features-section h2{font-size:2rem;color:#2c3e50;text-align:center;margin-bottom:40px}.features-section .features-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:30px}.features-section .feature-item{display:flex;align-items:flex-start;gap:15px;text-align:left;padding:0}.features-section .feature-icon{width:50px;height:50px;background:linear-gradient(135deg,#3498db,#2980b9);border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.5rem;flex-shrink:0;margin-bottom:0}.features-section .feature-text h4{font-size:1.1rem;color:#2c3e50;margin-bottom:5px}.features-section .feature-text p{color:#7f8c8d;font-size:.9rem}.tips-section{background:#fff;border-radius:20px;padding:35px;box-shadow:0 10px 40px #00000014;margin-bottom:30px}.tips-section h2{font-size:1.4rem;color:#2c3e50;margin-bottom:20px;padding-bottom:10px;border-bottom:2px solid #3498db}.tips-section h3{font-size:1.1rem;color:#e74c3c;margin:20px 0 10px}.tips-section p,.tips-section li{color:#555;font-size:.95rem;line-height:1.8}.tips-section ul{padding-left:25px;margin:10px 0}.tips-section li{margin-bottom:8px}.example-box{background:#f8f9fa;border-left:4px solid #3498db;padding:15px 20px;margin:15px 0;border-radius:0 10px 10px 0}.example-box p{margin-bottom:5px}.warning-box{background:#fff3cd;border:1px solid #ffc107;border-radius:10px;padding:20px;margin:20px 0}.warning-box h4{color:#856404;margin-bottom:10px}.pricing-section{background:#fff;border-radius:20px;padding:35px;box-shadow:0 10px 40px #00000014;margin-bottom:30px}.pricing-section h2{font-size:1.4rem;color:#2c3e50;margin-bottom:25px;padding-bottom:10px;border-bottom:2px solid #3498db}.pricing-table{width:100%;border-collapse:collapse}.pricing-table th,.pricing-table td{padding:15px 20px;text-align:left;border-bottom:1px solid #e9ecef}.pricing-table th{background:#f8f9fa;font-weight:600;color:#2c3e50}.pricing-table tr:hover{background:#f8f9fa}.price-tag{font-weight:700;color:#e74c3c;font-size:1.1rem}.discount-box{background:linear-gradient(135deg,#27ae60,#2ecc71);border-radius:15px;padding:25px;color:#fff;margin-top:25px}.discount-box h3{font-size:1.2rem;margin-bottom:15px;color:#fff}.discount-box ul{list-style:none;padding:0}.discount-box li{padding:8px 0;font-size:.95rem;color:#fff}.calculator-section{background:#fff;border-radius:20px;padding:35px;box-shadow:0 10px 40px #00000014;margin-bottom:30px}.calculator-section h2{font-size:1.4rem;color:#2c3e50;margin-bottom:25px;padding-bottom:10px;border-bottom:2px solid #3498db}.form-group{margin-bottom:25px}.form-group label{display:block;font-weight:600;color:#2c3e50;margin-bottom:10px}.form-group input[type=number]{width:100%;max-width:300px;padding:12px 15px;border:2px solid #e9ecef;border-radius:10px;font-size:1rem;transition:border-color .3s}.form-group input[type=number]:focus{outline:none;border-color:#3498db}.checkbox-group{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:15px}.checkbox-item{display:flex;align-items:center;gap:10px;padding:15px;background:#f8f9fa;border-radius:10px;cursor:pointer;transition:background .3s}.checkbox-item:hover{background:#e9ecef}.checkbox-item input[type=checkbox]{width:20px;height:20px;cursor:pointer}.checkbox-item span{color:#2c3e50}.result-box{background:linear-gradient(135deg,#3498db,#2980b9);border-radius:15px;padding:30px;text-align:center;color:#fff;margin-top:30px;display:none}.result-box.visible{display:block}.result-box h3{font-size:1.2rem;margin-bottom:15px}.result-price{font-size:3rem;font-weight:700}.result-note{font-size:.9rem;opacity:.9;margin-top:10px}.result-discount{background:#27ae60;border-radius:10px;padding:10px 20px;margin-top:15px;display:inline-block}.contact-section{background:#fff;border-radius:20px;padding:35px;box-shadow:0 10px 40px #00000014;text-align:center}.contact-section h2{font-size:1.4rem;color:#2c3e50;margin-bottom:20px}.contact-section p{color:#7f8c8d;margin-bottom:25px}.contact-btn{display:inline-block;padding:15px 40px;background:#12b7f5;color:#fff;text-decoration:none;border-radius:30px;font-weight:600;font-size:1.1rem;transition:background .3s,transform .2s}.contact-btn:hover{background:#0fa3e8;transform:translateY(-2px)}@media (max-width: 768px){.nav-links{display:none;position:absolute;top:60px;left:0;right:0;background:#fff;flex-direction:column;gap:0;box-shadow:0 4px 10px #0000001a;z-index:99}.nav-links.active{display:flex}.nav-link{padding:12px 20px;border-bottom:1px solid #e9ecef;border-bottom-color:transparent}.nav-link:hover,.nav-link.active{border-bottom-color:transparent;background:#f5f7fa}.nav-toggle{display:flex}.header h1{font-size:2.2rem}.header p{font-size:1.1rem}.resources h2,.features h2,.philosophy h2{font-size:1.8rem}.resources,.features,.philosophy{padding:60px 20px}.resource-card,.feature-item{padding:25px 15px}.resources-grid{grid-template-columns:1fr;max-width:100%}.book-grid{grid-template-columns:1fr}.virtual-scroll-container{height:calc(100vh - 280px)}.page-header h1{font-size:1.8rem}.stats{display:none}.modal{max-width:95%}.modal-title-zh{font-size:1.3rem}.contact-wrapper{grid-template-columns:1fr}.qrcode-section,.contact-list{padding:30px 20px}.qrcode-img{width:180px;height:180px}.pricing-card{padding:25px}.features-section{padding:30px 20px}.pricing-section,.calculator-section,.contact-section,.tips-section{padding:25px 20px}.pricing-table th,.pricing-table td{padding:10px 12px;font-size:.9rem}}@media (max-width: 480px){.header h1{font-size:1.8rem}.header p{font-size:1rem}.btn{padding:12px 24px;font-size:1rem}.resource-badge{margin:15px 0 10px 15px}.resource-content{padding:0 15px 20px}.page-header h1{font-size:1.5rem}.book-card{padding:15px;height:150px}.book-title-zh{font-size:1rem}.modal-title-zh{font-size:1.1rem}.contact-item{padding:15px 0}.contact-icon{width:45px;height:45px;font-size:1.1rem}.price{font-size:2.2rem}}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:#f5f7fa}::-webkit-scrollbar-thumb{background:#ccc;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#aaa}