.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}:root{--amazon-orange:#FF9900;--amazon-orange-dark:#E88B00;--amazon-dark:#131921;--amazon-dark-light:#232F3E;--amazon-gray:#37475A;--amazon-light:#EAEDED;--amazon-white:#FFFFFF;--text-dark:#0F1111;--text-gray:#565959;--text-muted:#6b7280;--text-link:#007185;--border-color:#DDD;--border-light:#e5e7eb;--success-color:#067D62;--error-color:#C7511F;--sidebar-width:280px;--card-bg:#FFFFFF;--card-shadow:0 1px 3px rgba(0,0,0,0.08);--card-shadow-hover:0 4px 12px rgba(0,0,0,0.12);--radius-sm:4px;--radius-md:8px;--radius-lg:12px;--font-xs:11px;--font-sm:13px;--font-base:15px;--font-md:17px;--font-lg:20px;--font-xl:24px;--font-2xl:28px;--font-3xl:32px;--weight-normal:400;--weight-medium:500;--weight-semibold:600;--weight-bold:700;--weight-extrabold:800;--spacing-xs:4px;--spacing-sm:8px;--spacing-md:16px;--spacing-lg:24px;--spacing-xl:32px;--spacing-2xl:48px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;background-color:var(--amazon-light);color:var(--text-dark);line-height:1.6;font-size:var(--font-base);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.skip-link{position:absolute;top:-100px;left:50%;transform:translateX(-50%);background:var(--amazon-dark);color:var(--amazon-orange);padding:12px 24px;border-radius:0 0 var(--radius-md) var(--radius-md);text-decoration:none;font-weight:var(--weight-semibold);z-index:10000;transition:top 0.2s ease;box-shadow:0 2px 8px rgba(0,0,0,0.3)}.skip-link:focus{top:0;outline:3px solid var(--amazon-orange);outline-offset:2px}:focus-visible{outline:3px solid var(--amazon-orange);outline-offset:2px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--amazon-orange);outline-offset:2px}h1,h2,h3,h4,h5,h6{font-weight:var(--weight-bold);line-height:1.3;color:var(--text-dark)}h1{font-size:var(--font-2xl)}h2{font-size:var(--font-xl)}h3{font-size:var(--font-lg)}h4{font-size:var(--font-md)}p{margin-bottom:var(--spacing-md);color:var(--text-gray)}a{color:var(--text-link);text-decoration:none}a:hover{color:var(--amazon-orange)}p a:hover,.prose a:hover,article a:hover,.blog-content a:hover{text-decoration:underline}.container{max-width:1500px;margin:0 auto;padding:0 15px}header.main-header{background:linear-gradient(to bottom,var(--amazon-dark),var(--amazon-dark-light));color:var(--amazon-white);padding:10px 0;position:sticky;top:0;z-index:1000}.header-content{display:flex;align-items:center;gap:20px;max-width:1500px;margin:0 auto;padding:0 15px}.logo{font-size:28px;font-weight:bold;color:var(--amazon-white);text-decoration:none}.logo:hover{color:var(--amazon-orange);text-decoration:none}.search-container{flex:1;max-width:700px}.search-form{display:flex;border-radius:4px;overflow:hidden}.search-form input{flex:1;padding:10px 15px;border:none;font-size:15px;outline:none}.search-form button{background-color:var(--amazon-orange);border:none;padding:0 20px;cursor:pointer;transition:background-color 0.2s}.search-form button:hover{background-color:var(--amazon-orange-dark)}.search-form button svg{width:22px;height:22px;fill:var(--amazon-dark)}.header-nav{display:flex;gap:20px}.header-nav a{color:var(--amazon-white);font-size:14px;padding:8px 12px;border-radius:3px;border:1px solid transparent;white-space:nowrap}.header-nav a:hover{border-color:var(--amazon-white);text-decoration:none}.cart-link{position:relative;display:flex;align-items:center}.cart-badge{position:absolute;top:-4px;right:-4px;min-width:18px;height:18px;background:var(--amazon-orange);color:var(--amazon-dark);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;padding:0 4px}.wishlist-link{position:relative;display:flex;align-items:center}.wishlist-badge{position:absolute;top:-4px;right:-4px;min-width:18px;height:18px;background:var(--amazon-orange);color:var(--amazon-dark);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;padding:0 4px}.bundle-link{position:relative;display:flex;align-items:center}.bundle-badge{position:absolute;top:-4px;right:-4px;min-width:18px;height:18px;background:#10b981;color:white;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;padding:0 4px}.account-link{display:flex;align-items:center;gap:6px}.account-link .account-name{font-size:13px}.login-link{background:var(--amazon-orange);color:var(--amazon-dark) !important;font-weight:600;padding:8px 16px !important;border-radius:4px}.login-link:hover{background:var(--amazon-orange-dark)}.main-layout{display:flex;min-height:calc(100vh - 130px);align-items:stretch}.sidebar{width:var(--sidebar-width);background:var(--amazon-white);border-right:1px solid var(--border-color);padding:20px;flex-shrink:0;display:flex;flex-direction:column;min-height:calc(100vh - 180px)}.sidebar h3{font-size:18px;color:var(--amazon-dark);margin-bottom:15px;padding-bottom:10px;border-bottom:2px solid var(--amazon-orange)}.promo-bar{background:linear-gradient(90deg,#232f3e 0%,#37475a 50%,#232f3e 100%);padding:10px 20px;text-align:center}.promo-bar-link{display:inline-flex;align-items:center;gap:12px;color:#fff;text-decoration:none;font-size:14px;transition:opacity 0.2s}.promo-bar-link:hover{opacity:0.9;text-decoration:none}.promo-bar-icon{font-size:18px}.promo-bar-text{color:#fff}.promo-bar-text strong{color:var(--amazon-orange)}.promo-bar-cta{background:var(--amazon-orange);color:#000;padding:6px 14px;border-radius:4px;font-weight:600;font-size:13px;transition:background 0.2s}.promo-bar-link:hover .promo-bar-cta{background:var(--amazon-orange-dark)}@media (max-width:768px){.promo-bar{padding:6px 12px}.promo-bar-link{flex-wrap:nowrap;justify-content:center;gap:6px;font-size:12px;line-height:1.3}.promo-bar-icon{font-size:14px;flex-shrink:0}.promo-bar-text{font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0}.promo-bar-cta{padding:3px 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var(--border-color)}.books-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:20px}.section-subtitle{color:var(--text-gray);font-size:15px;margin-top:-15px;margin-bottom:20px}.bundles-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:20px}.bundle-card{background:var(--amazon-white);border-radius:12px;overflow:hidden;box-shadow:0 2px 8px rgba(0,0,0,0.08);transition:all 0.3s;position:relative}.bundle-card:hover{box-shadow:0 8px 24px rgba(0,0,0,0.12);transform:translateY(-4px)}.bundle-card-link{display:block;text-decoration:none;color:inherit}.bundle-card .discount-badge{position:absolute;top:12px;left:12px;background:#dc2626;color:#fff;font-size:12px;font-weight:700;padding:4px 10px;border-radius:4px;z-index:2}.bundle-cover{height:180px;background:linear-gradient(135deg,var(--amazon-dark) 0%,var(--amazon-dark-light) 100%);display:flex;align-items:center;justify-content:center;overflow:hidden}.bundle-cover img{width:100%;height:100%;object-fit:contain;object-position:center}.bundle-cover .no-cover{display:flex;flex-direction:column;align-items:center;gap:8px;color:#fff}.bundle-cover .bundle-icon{font-size:48px}.bundle-cover .no-cover span:last-child{font-size:14px;opacity:0.8}.bundle-info{padding:16px}.bundle-title{font-size:17px;font-weight:700;color:var(--amazon-dark);margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.bundle-description{font-size:13px;color:var(--text-gray);margin-bottom:10px;line-height:1.4}.bundle-meta{margin-bottom:12px}.bundle-meta .book-count{font-size:13px;color:var(--amazon-orange);font-weight:600}.bundle-pricing{display:flex;align-items:center;gap:10px}.bundle-pricing .original-price{font-size:14px;color:var(--text-gray);text-decoration:line-through}.bundle-pricing .current-price{font-size:20px;font-weight:700;color:#dc2626}.bundle-savings{margin-top:8px;font-size:12px;color:#16a34a;font-weight:600}.view-all-btn{display:inline-block;padding:12px 28px;background:var(--amazon-orange);color:#000;font-weight:600;border-radius:6px;text-decoration:none;transition:background 0.2s}.view-all-btn:hover{background:var(--amazon-orange-dark);text-decoration:none}@media (max-width:768px){.bundles-grid{grid-template-columns:1fr}}.book-card{background:var(--amazon-white);border-radius:8px;overflow:hidden;box-shadow:0 2px 5px rgba(0,0,0,0.1);transition:all 0.3s;display:flex;flex-direction:column}.book-card:hover{box-shadow:0 5px 20px rgba(0,0,0,0.15);transform:translateY(-3px)}.book-card-image{width:100%;height:auto;aspect-ratio:2 / 3;object-fit:contain;background-color:#121d37}.book-card-content{padding:15px;display:flex;flex-direction:column;flex:1}.book-card-title{font-size:16px;font-weight:600;color:var(--text-dark);margin-bottom:5px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.book-card-title a{color:var(--text-dark)}.book-card-title a:hover{color:var(--amazon-orange);text-decoration:none}.book-card-subtitle{font-size:12px;color:var(--text-muted);margin:2px 0 4px 0;line-height:1.3;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}.book-card-author{font-size:14px;color:var(--text-gray);margin-bottom:5px}.book-card-views{display:flex;align-items:center;gap:5px;font-size:12px;color:var(--text-muted);margin-bottom:8px}.book-card-views svg{opacity:0.7}.book-card-price{font-size:20px;font-weight:bold;color:var(--error-color)}.book-card-price .currency{font-size:12px;vertical-align:top}.book-card-image-link{position:relative;display:block}.book-card-discount{position:absolute;top:10px;left:10px;background:#B12704;color:white;padding:4px 8px;border-radius:4px;font-size:12px;font-weight:bold;z-index:1}.book-card-lang{position:absolute !important;top:10px !important;right:10px !important;left:auto !important;font-size:22px;line-height:1;z-index:4;filter:drop-shadow(0 2px 4px rgba(0,0,0,0.6))}.book-card-updated{position:absolute;top:10px;left:10px;background:linear-gradient(135deg,#FF9900,#e68a00);color:#fff;padding:3px 8px;border-radius:4px;font-size:10px;font-weight:700;z-index:2;letter-spacing:0.02em;box-shadow:0 2px 4px rgba(0,0,0,0.15);text-transform:uppercase}.book-card-new{position:absolute;top:10px;left:10px;background:linear-gradient(135deg,#067D62,#045c48);color:#fff;padding:3px 8px;border-radius:4px;font-size:10px;font-weight:700;z-index:2;letter-spacing:0.04em;box-shadow:0 2px 4px rgba(0,0,0,0.15);text-transform:uppercase}.book-detail-image-container{position:relative}.book-detail-updated-badge{position:absolute;top:12px;left:12px;background:linear-gradient(135deg,#FF9900,#e68a00);color:#fff;padding:6px 14px;border-radius:6px;font-size:13px;font-weight:700;z-index:2;letter-spacing:0.02em;box-shadow:0 2px 6px rgba(0,0,0,0.2)}.book-card-bestseller{position:absolute;top:10px;right:10px;background:linear-gradient(135deg,#FFD700,#FFA500);color:#000;padding:4px 8px;border-radius:4px;font-size:11px;font-weight:bold;z-index:1;display:flex;align-items:center;gap:4px;box-shadow:0 2px 4px rgba(0,0,0,0.2)}.book-card-no-cover{display:flex;align-items:center;justify-content:center;color:#999;font-size:14px}.book-card-original-price{text-decoration:line-through;color:#888;font-size:13px;margin-right:6px}.book-card-sale-price{color:#067D62;font-weight:700}.book-card-current-price{color:#067D62;font-weight:700}.book-card-free{color:#067D62 !important}.book-card-actions{display:flex;gap:6px;margin-top:auto;padding-top:12px;align-items:center}.book-card-btn{display:inline-flex;align-items:center;justify-content:center;gap:4px;padding:8px 12px;border-radius:6px;font-size:12px;font-weight:600;text-decoration:none;border:none;cursor:pointer;transition:all 0.2s;line-height:1;min-height:34px;box-sizing:border-box}.book-card-btn-buy{flex:1;min-width:0;background:linear-gradient(to bottom,#FF9900,#e68a00);color:#131921;font-weight:700;white-space:nowrap;padding:8px 10px}.book-card-btn-buy:hover{background:linear-gradient(to bottom,#e68a00,#cc7a00);color:#131921;text-decoration:none}.book-card-btn-cart,.book-card-btn-compare{background:#f3f4f6;color:#374151;padding:0;flex-shrink:0;width:34px;height:34px}.book-card-btn-cart:hover{background:#e5e7eb;color:#131921}.book-card-btn-cart.added{background:#10B981;color:white}.book-card-btn-compare:hover{background:#dbeafe;color:#1d4ed8}.book-card-btn-compare.active{background:#3b82f6;color:white}body.dark .book-card{background:#161b22 !important;box-shadow:0 2px 5px rgba(0,0,0,0.3) !important}body.dark .book-card:hover{box-shadow:0 5px 20px rgba(0,0,0,0.4) !important}body.dark .book-card-content{background:#161b22 !important}body.dark .book-card-title,body.dark .book-card-title a{color:#e6edf3 !important}body.dark .book-card-title a:hover{color:#FF9900 !important}body.dark .book-card-subtitle{color:#8b949e !important}body.dark .book-card-author{color:#8b949e !important}body.dark .book-card-views{color:#6e7681 !important}body.dark .book-card-original-price{color:#6e7681 !important}body.dark .book-card-current-price,body.dark .book-card-sale-price{color:#3fb950 !important}body.dark .book-card-btn-buy{color:#fff !important}body.dark .book-card-btn-buy:hover{color:#fff !important}body.dark .book-card-btn-cart,body.dark .book-card-btn-compare{background:#21262d !important;color:#c9d1d9 !important}body.dark .book-card-btn-cart:hover{background:#30363d !important;color:#e6edf3 !important}body.dark .book-card-btn-compare:hover{background:#1c3a5f !important;color:#58a6ff !important}body.dark .book-card-no-cover{color:#6e7681 !important}.book-detail{background:var(--amazon-white);border-radius:8px;padding:30px;box-shadow:0 2px 5px rgba(0,0,0,0.1)}.book-detail-header{display:grid;grid-template-columns:300px 1fr;gap:40px;margin-bottom:40px}.book-detail-image{width:100%;height:auto;object-fit:contain;border-radius:8px;box-shadow:0 5px 15px rgba(0,0,0,0.2)}.book-detail-info h1{font-size:28px;color:var(--amazon-dark);margin-bottom:10px}.book-detail-author{font-size:18px;color:var(--text-gray);margin-bottom:20px}.book-detail-meta{display:flex;flex-wrap:wrap;gap:20px;margin-bottom:20px;padding:15px;background:var(--amazon-light);border-radius:5px}.book-detail-meta-item{font-size:14px}.book-detail-meta-item strong{color:var(--text-dark)}.book-detail-price{font-size:32px;font-weight:bold;color:var(--error-color);margin-bottom:20px}.btn{display:inline-block;padding:12px 25px;font-size:16px;font-weight:600;text-align:center;border-radius:30px;cursor:pointer;transition:all 0.3s;border:none;text-decoration:none}.btn-primary{background:linear-gradient(to bottom,#f7dfa5,#f0c14b);color:var(--text-dark);border:1px solid #a88734}.btn-primary:hover{background:linear-gradient(to bottom,#f5d78e,#eeb933);text-decoration:none;color:var(--text-dark)}.btn-secondary{background:var(--amazon-white);color:var(--text-dark);border:1px solid var(--border-color)}.btn-secondary:hover{background:var(--amazon-light);text-decoration:none}.btn-buy{background:linear-gradient(to bottom,#22c55e,#16a34a);color:#fff;font-size:16px;font-weight:700;padding:14px 32px;border-radius:8px;display:inline-flex;align-items:center;gap:10px;box-shadow:0 3px 8px rgba(34,197,94,0.35);text-transform:uppercase;letter-spacing:0.5px}.btn-buy:hover{background:linear-gradient(to bottom,#16a34a,#15803d);color:#fff;text-decoration:none;transform:translateY(-2px);box-shadow:0 6px 12px rgba(34,197,94,0.4)}.btn-add-cart{background:linear-gradient(to bottom,#37475A,#2d3a47);color:var(--amazon-white);font-size:15px;font-weight:600;padding:12px 24px;border:none;cursor:pointer;display:inline-flex;align-items:center;gap:8px;border-radius:8px;transition:all 0.2s}.btn-add-cart:hover{background:linear-gradient(to 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h2{font-size:24px;margin-bottom:25px;padding-bottom:15px;border-bottom:2px solid var(--amazon-orange)}@media (max-width:768px){.book-detail-header{grid-template-columns:1fr}.book-detail-image-container{max-width:300px;margin:0 auto}.book-detail-actions{flex-direction:column}.book-detail-actions .btn{width:100%;justify-content:center}}.cart-page{padding:var(--spacing-xl) 0;min-height:60vh}.page-title{display:flex;align-items:center;gap:var(--spacing-sm);font-size:var(--font-2xl);color:var(--text-dark);margin-bottom:var(--spacing-xl)}.page-title svg{color:var(--amazon-orange)}.cart-count{font-weight:var(--weight-normal);color:var(--text-muted);font-size:var(--font-lg)}.cart-empty{text-align:center;padding:var(--spacing-2xl) var(--spacing-md);background:var(--card-bg);border-radius:var(--radius-lg);box-shadow:var(--card-shadow)}.empty-icon{width:120px;height:120px;background:var(--amazon-light);border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 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svg{width:18px;height:18px}.mobile-menu{width:85%;max-width:300px}}.error-page{min-height:60vh;display:flex;align-items:center;justify-content:center;padding:40px 20px;position:relative;overflow:hidden}.error-container{text-align:center;max-width:600px;position:relative;z-index:2}.error-icon-wrapper{display:inline-flex;align-items:center;justify-content:center;width:140px;height:140px;background:linear-gradient(135deg,#f3f4f6 0%,#e5e7eb 100%);border-radius:50%;margin-bottom:24px;color:var(--amazon-dark);animation:pulse-soft 2s ease-in-out infinite}@keyframes pulse-soft{0%,100%{transform:scale(1)}50%{transform:scale(1.05)}}.error-code{font-size:120px;font-weight:800;line-height:1;background:linear-gradient(135deg,var(--amazon-dark) 0%,var(--amazon-dark-light) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:16px;letter-spacing:-4px}.error-title{font-size:28px;font-weight:700;color:var(--amazon-dark);margin-bottom:12px}.error-message{font-size:17px;color:var(--text-gray);line-height:1.6;margin-bottom:32px}.error-actions{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-bottom:40px}.error-btn{display:inline-flex;align-items:center;gap:8px;padding:14px 24px;border-radius:8px;font-size:15px;font-weight:600;text-decoration:none;transition:all 0.2s}.error-btn-primary{background:var(--amazon-orange);color:#000}.error-btn-primary:hover{background:var(--amazon-orange-dark);transform:translateY(-2px);box-shadow:0 4px 12px rgba(255,153,0,0.3);text-decoration:none}.error-btn-secondary{background:#f3f4f6;color:var(--amazon-dark);border:1px solid #e5e7eb}.error-btn-secondary:hover{background:#e5e7eb;transform:translateY(-2px);text-decoration:none}.error-search{padding:24px;background:#f9fafb;border-radius:12px;margin-bottom:24px}.error-search p{font-size:14px;color:var(--text-gray);margin-bottom:12px}.error-search-form{display:flex;gap:0;max-width:400px;margin:0 auto}.error-search-form input{flex:1;padding:12px 16px;border:2px solid #e5e7eb;border-right:none;border-radius:8px 0 0 8px;font-size:15px;outline:none;transition:border-color 0.2s}.error-search-form input:focus{border-color:var(--amazon-orange)}.error-search-form button{padding:12px 18px;background:var(--amazon-orange);border:none;border-radius:0 8px 8px 0;color:#000;cursor:pointer;transition:background 0.2s}.error-search-form button:hover{background:var(--amazon-orange-dark)}.error-help{background:#fef3c7;border:1px solid #fcd34d;border-radius:8px;padding:16px 20px;margin-bottom:24px;font-size:14px;color:#92400e}.error-help p{margin:0}.error-footer{font-size:14px;color:var(--text-gray)}.error-footer a{color:var(--amazon-orange);font-weight:600}.error-footer a:hover{text-decoration:underline}.error-decoration{position:absolute;top:0;left:0;right:0;bottom:0;pointer-events:none;overflow:hidden;z-index:1}.error-circle{position:absolute;border-radius:50%;opacity:0.05}.error-circle-1{width:400px;height:400px;background:var(--amazon-orange);top:-100px;right:-100px;animation:float 8s ease-in-out infinite}.error-circle-2{width:300px;height:300px;background:var(--amazon-dark);bottom:-50px;left:-50px;animation:float 10s ease-in-out infinite reverse}.error-circle-3{width:200px;height:200px;background:var(--amazon-orange);top:50%;left:20%;animation:float 6s ease-in-out infinite}@keyframes float{0%,100%{transform:translate(0,0)}50%{transform:translate(20px,20px)}}@media (max-width:768px){.error-code{font-size:80px;letter-spacing:-2px}.error-title{font-size:22px}.error-message{font-size:15px}.error-icon-wrapper{width:100px;height:100px}.error-icon-wrapper svg{width:50px;height:50px}.error-actions{flex-direction:column}.error-btn{width:100%;justify-content:center}.error-search-form{flex-direction:column;gap:8px}.error-search-form input{border-right:2px solid #e5e7eb;border-radius:8px}.error-search-form button{border-radius:8px}}.book-sample-preview{margin-top:16px}.sample-toggle-btn{display:flex;align-items:center;width:100%;padding:12px 16px;background:#131921;border:none;border-radius:8px;cursor:pointer;transition:all 0.2s ease;gap:10px}.sample-toggle-btn:hover{background:#232f3e}.sample-toggle-btn.active{border-radius:8px 8px 0 0}.sample-toggle-icon{display:flex;align-items:center;justify-content:center;width:32px;height:32px;background:#FF9900;border-radius:6px;flex-shrink:0}.sample-toggle-icon svg{color:white}.sample-toggle-text{font-size:14px;font-weight:600;color:white;letter-spacing:0.2px}.sample-toggle-arrow{display:flex;align-items:center;justify-content:center;margin-left:auto;color:rgba(255,255,255,0.6);transition:transform 0.25s ease}.sample-toggle-arrow.rotated{transform:rotate(180deg)}.sample-reader-body{border:1px solid #e5e7eb;border-top:none;border-radius:0 0 8px 8px;overflow:hidden;animation:sampleSlideIn 0.25s ease}@keyframes sampleSlideIn{from{opacity:0;max-height:0}to{opacity:1;max-height:800px}}.sample-pdf-viewer{background:linear-gradient(180deg,#4a4d50 0%,#3a3d40 100%)}.pdf-controls{display:flex;align-items:center;justify-content:center;gap:6px;padding:12px 20px;background:linear-gradient(180deg,#2d2f31 0%,#232527 100%);border-bottom:1px solid rgba(255,255,255,0.05)}.pdf-controls button{width:38px;height:38px;border:1px solid rgba(255,255,255,0.15);background:rgba(255,255,255,0.08);color:white;border-radius:var(--radius-sm);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all 0.2s ease}.pdf-controls button:hover:not(:disabled){background:var(--amazon-orange);border-color:var(--amazon-orange);transform:translateY(-1px);box-shadow:0 3px 8px rgba(255,153,0,0.3)}.pdf-controls button:disabled{opacity:0.35;cursor:not-allowed}.pdf-page-info{color:white;font-size:var(--font-sm);padding:0 16px;min-width:120px;text-align:center;font-weight:var(--weight-medium);background:rgba(0,0,0,0.2);border-radius:20px;height:38px;display:flex;align-items:center;justify-content:center}.pdf-controls .zoom-btn{margin-left:6px}.download-sample-btn{display:flex;align-items:center;gap:6px;padding:10px 18px;background:linear-gradient(180deg,var(--amazon-orange) 0%,var(--amazon-orange-dark) 100%);color:white;text-decoration:none;border-radius:var(--radius-sm);font-size:var(--font-sm);font-weight:var(--weight-semibold);margin-left:12px;transition:all 0.2s ease;border:none;box-shadow:0 2px 6px rgba(255,153,0,0.25)}.download-sample-btn:hover{background:linear-gradient(180deg,#ffaa22 0%,var(--amazon-orange) 100%);color:white;transform:translateY(-1px);box-shadow:0 4px 12px rgba(255,153,0,0.4)}.pdf-canvas-container{position:relative;display:flex;justify-content:center;overflow:auto;max-height:650px;padding:24px;background:linear-gradient(180deg,#505356 0%,#404346 100%)}#pdfCanvas{box-shadow:0 8px 32px rgba(0,0,0,0.4),0 2px 8px rgba(0,0,0,0.2);background:white;border-radius:2px}.pdf-loading{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);display:flex;flex-direction:column;align-items:center;gap:16px;color:white;font-size:var(--font-sm);font-weight:var(--weight-medium)}.loading-spinner{width:44px;height:44px;border:3px solid rgba(255,255,255,0.15);border-top-color:var(--amazon-orange);border-radius:50%;animation:spin 0.8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media (max-width:768px){.sample-reader-header{padding:12px 14px}.sample-reader-title{font-size:var(--font-sm)}.pdf-controls{gap:4px;padding:10px 12px;flex-wrap:wrap}.pdf-controls button{width:34px;height:34px}.pdf-page-info{font-size:var(--font-xs);min-width:100px;padding:0 12px;height:34px;order:-1;width:100%;margin-bottom:8px}.download-sample-btn{padding:8px 12px;font-size:var(--font-xs);margin-left:6px}.pdf-canvas-container{max-height:450px;padding:16px}}@media (max-width:480px){.pdf-controls{padding:8px 10px}.download-sample-btn span{display:none}.download-sample-btn{padding:8px;margin-left:4px}.pdf-canvas-container{max-height:350px;padding:12px}}.exit-intent-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,0.85);z-index:99999;display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;transition:opacity 0.3s ease,visibility 0.3s ease;backdrop-filter:blur(4px)}.exit-intent-overlay.active{opacity:1;visibility:visible}.exit-intent-popup{background:linear-gradient(145deg,#1a1a2e,#16213e);border-radius:20px;padding:3rem 2.5rem;max-width:480px;width:90%;text-align:center;position:relative;transform:scale(0.8) translateY(20px);transition:transform 0.4s cubic-bezier(0.175,0.885,0.32,1.275);box-shadow:0 25px 80px rgba(0,0,0,0.5),0 0 60px rgba(255,153,0,0.15);border:1px solid rgba(255,255,255,0.1)}.exit-intent-overlay.active .exit-intent-popup{transform:scale(1) translateY(0)}.exit-intent-close{position:absolute;top:1rem;right:1rem;background:rgba(255,255,255,0.1);border:none;color:#999;font-size:1.5rem;width:36px;height:36px;border-radius:50%;cursor:pointer;transition:all 0.2s ease;display:flex;align-items:center;justify-content:center}.exit-intent-close:hover{background:rgba(255,255,255,0.2);color:#fff}.exit-intent-icon{font-size:4rem;margin-bottom:1rem;animation:bounce 1s ease infinite}@keyframes bounce{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}.exit-intent-headline{color:#fff;font-size:1.75rem;font-weight:700;margin-bottom:0.5rem;line-height:1.3}.exit-intent-subheadline{color:#aaa;font-size:1rem;margin-bottom:1.5rem}.exit-intent-discount{background:linear-gradient(135deg,var(--amazon-orange),#ff7b00);padding:1.25rem 2rem;border-radius:12px;font-size:2.5rem;font-weight:800;color:#000;margin-bottom:1rem;text-shadow:0 1px 2px rgba(255,255,255,0.2);box-shadow:0 4px 20px rgba(255,153,0,0.4)}.exit-intent-code{background:rgba(255,255,255,0.1);border:2px dashed rgba(255,153,0,0.5);padding:1rem;border-radius:10px;font-family:'Courier New',monospace;font-size:1.5rem;font-weight:700;color:var(--amazon-orange);letter-spacing:3px;margin-bottom:1.5rem;cursor:pointer;transition:all 0.2s ease;position:relative}.exit-intent-code:hover{background:rgba(255,153,0,0.1);border-color:var(--amazon-orange)}.exit-intent-code::after{content:'Click to copy';position:absolute;bottom:-20px;left:50%;transform:translateX(-50%);font-size:0.7rem;color:#888;font-family:sans-serif;letter-spacing:normal}.exit-intent-code.copied::after{content:'Copied!';color:#10b981}.exit-intent-cta{background:var(--amazon-orange);color:#000;border:none;padding:1rem 2.5rem;border-radius:10px;font-size:1.1rem;font-weight:700;cursor:pointer;width:100%;transition:all 0.2s ease;text-transform:uppercase;letter-spacing:1px}.exit-intent-cta:hover{background:var(--amazon-orange-dark);transform:translateY(-2px);box-shadow:0 4px 15px rgba(255,153,0,0.4)}.exit-intent-email-form{margin:1rem 0 0.5rem}.exit-intent-email-input{width:100%;padding:0.75rem 1rem;border:2px solid #ddd;border-radius:10px;font-size:1rem;margin-bottom:0.75rem;box-sizing:border-box;transition:border-color 0.2s}.exit-intent-email-input:focus{border-color:var(--amazon-orange);outline:none;box-shadow:0 0 0 3px rgba(255,153,0,0.15)}.exit-intent-success{margin-top:1rem}.exit-intent-dismiss{background:none;border:none;color:#666;font-size:0.85rem;margin-top:1rem;cursor:pointer;text-decoration:underline}.exit-intent-dismiss:hover{color:#999}.exit-intent-timer{color:#ff6b6b;font-size:0.9rem;margin-top:0.75rem;font-weight:500}@media (max-width:480px){.exit-intent-popup{padding:2rem 1.5rem}.exit-intent-icon{font-size:3rem}.exit-intent-headline{font-size:1.4rem}.exit-intent-discount{font-size:2rem;padding:1rem}.exit-intent-code{font-size:1.2rem}}.upsell-section{background:linear-gradient(135deg,#fff9e6 0%,#fff5d6 100%);border:2px solid #FF9900;border-radius:12px;padding:1.5rem;margin-top:1.5rem}.upsell-header{margin-bottom:1rem}.upsell-header h3{display:flex;align-items:center;gap:0.5rem;font-size:1.1rem;color:#131921;margin:0 0 0.25rem 0}.upsell-header h3 svg{color:#FF9900}.upsell-subtitle{color:#666;font-size:0.9rem}.upsell-items{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem}.upsell-item{background:white;border-radius:8px;padding:1rem;display:flex;gap:1rem;box-shadow:0 2px 8px rgba(0,0,0,0.08);transition:transform 0.2s,box-shadow 0.2s}.upsell-item:hover{transform:translateY(-2px);box-shadow:0 4px 12px rgba(0,0,0,0.12)}.upsell-cover{position:relative;flex-shrink:0}.upsell-cover img{width:60px;height:80px;object-fit:cover;border-radius:4px}.upsell-badge{position:absolute;top:-5px;right:-5px;background:#e53e3e;color:white;font-size:0.65rem;font-weight:bold;padding:2px 5px;border-radius:3px}.upsell-info{flex:1;display:flex;flex-direction:column;gap:0.5rem}.upsell-title{font-size:0.9rem;font-weight:600;color:#131921;text-decoration:none;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.upsell-title:hover{color:#FF9900}.upsell-price{display:flex;align-items:center;gap:0.5rem}.upsell-price .price-was{color:#999;text-decoration:line-through;font-size:0.85rem}.upsell-price .price-now{color:#e53e3e;font-weight:bold;font-size:1rem}.upsell-add-btn{display:inline-flex;align-items:center;justify-content:center;gap:0.35rem;background:#FF9900;color:#131921;border:none;border-radius:6px;padding:0.5rem 0.75rem;font-size:0.8rem;font-weight:600;cursor:pointer;transition:background 0.2s,transform 0.2s;margin-top:auto}.upsell-add-btn:hover{background:#e88a00;transform:scale(1.02)}.upsell-add-btn.added{background:#10b981;color:white}@media (max-width:768px){.upsell-items{grid-template-columns:1fr}}.recently-viewed-section{margin:40px 0;padding:24px;background:#f8f9fa;border-radius:12px;max-width:100%;overflow:hidden}.recently-viewed-section h2{display:flex;align-items:center;gap:10px;font-size:1.3rem;color:#131921;margin:0 0 5px 0}.recently-viewed-section .section-subtitle{color:#666;font-size:0.9rem;margin:0 0 20px 0}.recently-viewed-scroll{display:flex;gap:16px;overflow-x:auto;overflow-y:hidden;padding-bottom:10px;scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch;max-height:280px}.recently-viewed-scroll::-webkit-scrollbar{height:6px}.recently-viewed-scroll::-webkit-scrollbar-track{background:#e5e5e5;border-radius:3px}.recently-viewed-scroll::-webkit-scrollbar-thumb{background:#ccc;border-radius:3px}.recent-book-card{flex:0 0 140px;width:140px;max-width:140px;text-decoration:none;scroll-snap-align:start;transition:transform 0.2s}.recent-book-card:hover{transform:translateY(-4px)}.recent-book-cover{width:140px;height:210px;border-radius:8px;overflow:hidden;box-shadow:0 4px 12px rgba(0,0,0,0.15);margin-bottom:10px;background:#121d37;display:flex;align-items:center;justify-content:center}.recent-book-cover img{max-width:100%;max-height:100%;width:auto;height:auto;object-fit:contain}.recent-book-info{display:flex;flex-direction:column;gap:4px}.recent-book-title{font-size:0.85rem;font-weight:600;color:#131921;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.3}.recent-book-price{font-size:0.9rem;font-weight:bold;color:#e53e3e}@media (max-width:768px){.recent-book-card{width:120px}.recent-book-cover{height:150px}}.price-alert-wrapper{margin-top:16px;background:linear-gradient(135deg,#fffbeb 0%,#fef3c7 100%);border:2px solid #f59e0b;border-radius:10px;padding:14px 16px}.price-alert-toggle-btn{display:flex;align-items:center;gap:8px;background:none;border:none;color:#92400e;font-weight:600;font-size:0.95rem;cursor:pointer;padding:0;width:100%}.price-alert-toggle-btn svg{color:#f59e0b;flex-shrink:0}.price-alert-toggle-btn:hover{color:#78350f}.price-alert-dropdown{display:none;margin-top:12px;padding-top:12px;border-top:1px solid #fcd34d}.price-alert-dropdown.active{display:block}.price-alert-content{display:flex;gap:10px}.price-alert-email{flex:1;padding:10px 14px;border:2px solid #fcd34d;border-radius:6px;font-size:0.95rem;background:white}.price-alert-email:focus{outline:none;border-color:#f59e0b}.price-alert-submit{padding:10px 18px;background:linear-gradient(135deg,#f59e0b 0%,#d97706 100%);color:white;border:none;border-radius:6px;font-weight:600;font-size:0.9rem;cursor:pointer;white-space:nowrap;transition:all 0.2s}.price-alert-submit:hover{background:linear-gradient(135deg,#d97706 0%,#b45309 100%)}.price-alert-submit.success{background:#10b981}.price-alert-info{font-size:0.8rem;color:#78716c;margin:8px 0 0 0}.price-alert-msg{margin-top:8px;padding:8px 12px;border-radius:5px;font-size:0.85rem;display:none}.price-alert-msg.success{display:block;background:#d1fae5;color:#065f46}.price-alert-msg.error{display:block;background:#fee2e2;color:#b91c1c}@media (max-width:480px){.price-alert-content{flex-direction:column}}.recently-viewed-container{margin-top:12px;background:#fff;border-radius:var(--radius-md);padding:12px;border:1px solid var(--border-light);box-shadow:0 1px 3px rgba(0,0,0,0.05)}.recently-viewed-heading{font-size:13px;font-weight:700;color:var(--amazon-dark);margin:0 0 10px 0;padding:0 0 8px 0;border-bottom:1px solid var(--border-light);text-transform:uppercase;letter-spacing:0.5px}.recently-viewed-list{display:flex;flex-direction:column;gap:6px}.recently-viewed-item{display:flex !important;flex-direction:row !important;align-items:center !important;gap:10px !important;padding:6px !important;background:#fafafa !important;border-radius:var(--radius-sm) !important;text-decoration:none !important;transition:all 0.2s ease !important;border:1px solid transparent !important}.recently-viewed-item:hover{background:#fff7ed !important;border-color:var(--amazon-orange) !important;transform:translateX(2px)}.recently-viewed-item img{width:36px !important;height:52px !important;min-width:36px !important;max-width:36px !important;object-fit:cover !important;border-radius:2px !important;flex-shrink:0 !important;box-shadow:0 1px 2px rgba(0,0,0,0.1)}.recently-viewed-info{display:flex !important;flex-direction:column !important;gap:2px !important;min-width:0 !important;flex:1 !important}.recently-viewed-title{font-size:11px !important;font-weight:500 !important;color:var(--text-dark) !important;line-height:1.25 !important;display:-webkit-box !important;-webkit-line-clamp:2 !important;-webkit-box-orient:vertical !important;overflow:hidden 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