:root{--bg: #fafafa;--bg-card: #ffffff;--bg-footer: #111827;--bg-alt: #f3f4f6;--text: #1f2937;--text-muted: #6b7280;--text-light: #9ca3af;--border: #e5e7eb;--accent: #2563eb;--accent-hover: #1d4ed8;--accent-light: #dbeafe;--accent-dark: #1e40af;--green: #059669;--orange: #d97706;--red: #dc2626;--star: #f59e0b;--radius: 8px;--radius-lg: 12px;--shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);--shadow-md: 0 4px 6px rgba(0,0,0,.06), 0 2px 4px rgba(0,0,0,.04);--shadow-lg: 0 10px 25px rgba(0,0,0,.08), 0 4px 10px rgba(0,0,0,.04)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.container{max-width:1200px;margin:0 auto;padding:0 24px}.container-narrow{max-width:800px;margin:0 auto;padding:0 24px}.topbar{background:var(--accent-dark);color:#dbeafe;font-size:12px;padding:6px 0}.topbar-inner{display:flex;justify-content:space-between;align-items:center}.topbar-links{display:flex;gap:16px}.topbar-links a{color:#93c5fd;font-size:12px}.topbar-links a:hover{color:#fff;text-decoration:none}.header{background:var(--bg-card);border-bottom:1px solid var(--border);padding:12px 0;position:sticky;top:0;z-index:100;box-shadow:0 1px 3px #0000000a}.header-inner{display:flex;align-items:center;gap:24px}.header-logo{display:flex;align-items:center;gap:10px;text-decoration:none;flex-shrink:0}.header-logo:hover{text-decoration:none}.logo-icon{width:36px;height:36px;background:var(--accent);color:#fff;font-weight:800;font-size:20px;display:flex;align-items:center;justify-content:center;border-radius:8px}.logo-text{font-size:18px;font-weight:700;color:var(--text)}.header-search{flex:1;max-width:520px;position:relative;display:flex}.header-search-input{width:100%;padding:10px 44px 10px 16px;border:2px solid var(--border);border-radius:var(--radius);font-size:14px;outline:none;transition:border-color .15s}.header-search-input:focus{border-color:var(--accent)}.header-search-btn{position:absolute;right:4px;top:4px;bottom:4px;width:36px;background:var(--accent);color:#fff;border:none;border-radius:6px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .15s}.header-search-btn:hover{background:var(--accent-hover)}.header-nav{display:flex;align-items:center;gap:20px;flex-shrink:0}.nav-link-store{color:var(--text-muted)!important;font-size:14px;font-weight:500;text-decoration:none!important;transition:color .15s}.nav-link-store:hover{color:var(--text)!important;text-decoration:none!important}.cart-link{position:relative}.mobile-menu-btn{display:none;background:none;border:none;cursor:pointer;color:var(--text);padding:4px}.mobile-nav{display:none;border-top:1px solid var(--border);background:var(--bg-card)}.mobile-nav-link{display:block;padding:12px 16px;color:var(--text)!important;font-size:15px;font-weight:500;border-bottom:1px solid var(--border);text-decoration:none!important}.mobile-nav-link:hover{background:var(--bg-alt);text-decoration:none!important}.hero{background:linear-gradient(135deg,#1e3a8a,#2563eb,#3b82f6);color:#fff;padding:80px 0 64px;text-align:center}.hero-content{max-width:680px;margin:0 auto}.hero-title{font-size:48px;font-weight:800;line-height:1.1;margin-bottom:16px;letter-spacing:-.5px}.hero-subtitle{font-size:18px;color:#bfdbfe;margin-bottom:32px;line-height:1.6}.hero-search{display:flex;max-width:520px;margin:0 auto 40px;box-shadow:0 4px 16px #0003;border-radius:var(--radius-lg);overflow:hidden}.hero-search-input{flex:1;padding:16px 20px;font-size:16px;border:none;outline:none}.hero-search-btn{border-radius:0;padding:16px 28px;font-size:15px}.hero-stats{display:flex;justify-content:center;gap:48px}.hero-stat{display:flex;flex-direction:column;align-items:center}.hero-stat strong{font-size:24px;font-weight:700}.hero-stat span{font-size:13px;color:#93c5fd}.section{padding:56px 0}.section-alt{background:var(--bg-alt)}.section-title{font-size:24px;font-weight:700;margin-bottom:24px}.section-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.section-header .section-title{margin-bottom:0}.section-link{font-size:14px;font-weight:600;color:var(--accent)!important}.product-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}.product-card-link{text-decoration:none!important;color:inherit!important}.product-card{transition:transform .2s,box-shadow .2s}.product-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}.product-card-rating{margin-bottom:8px;display:flex;align-items:center;gap:6px}.rating-count{font-size:12px;color:var(--text-muted)}.placeholder-cover{display:flex;align-items:center;justify-content:center;font-size:40px;color:var(--text-light);background:var(--bg-alt)}.category-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.category-card{background:var(--bg-card);border:2px solid var(--border);border-radius:var(--radius-lg);padding:24px;text-align:center;text-decoration:none!important;color:var(--text)!important;transition:all .2s;display:flex;flex-direction:column;align-items:center;gap:4px}.category-card:hover{border-color:var(--accent);box-shadow:var(--shadow-md);text-decoration:none!important}.category-card.coming-soon{opacity:.6;cursor:default}.category-card.coming-soon:hover{border-color:var(--border);box-shadow:none}.category-icon{font-size:36px;margin-bottom:4px}.category-label{font-size:15px;font-weight:600}.category-desc{font-size:12px;color:var(--text-muted)}.value-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}.value-card{text-align:center;padding:24px 16px}.value-icon{font-size:32px;margin-bottom:12px}.value-card h3{font-size:16px;font-weight:600;margin-bottom:8px}.value-card p{font-size:13px;color:var(--text-muted);line-height:1.5}.newsletter-section{padding:56px 0;background:var(--bg-alt)}.newsletter-inner{max-width:500px;margin:0 auto;text-align:center}.newsletter-inner h2{font-size:24px;font-weight:700;margin-bottom:8px}.newsletter-inner p{font-size:14px;color:var(--text-muted);margin-bottom:20px}.newsletter-form{display:flex;gap:8px;max-width:420px;margin:0 auto}.newsletter-input{flex:1;padding:12px 16px;border:2px solid var(--border);border-radius:var(--radius);font-size:14px;outline:none}.newsletter-input:focus{border-color:var(--accent)}.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 20px;border-radius:var(--radius);font-size:14px;font-weight:600;cursor:pointer;border:none;transition:all .15s}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover)}.btn-outline{background:transparent;color:var(--accent);border:1px solid var(--accent)}.btn-outline:hover{background:var(--accent-light)}.btn-lg{padding:14px 28px;font-size:16px}.btn-sm{padding:6px 14px;font-size:13px}.btn:disabled{opacity:.5;cursor:not-allowed}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}.book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}.book-card-cover{width:100%;aspect-ratio:3/4;object-fit:cover;background:var(--border)}.book-card-body{padding:16px}.book-card-title{font-size:15px;font-weight:600;margin-bottom:4px;line-height:1.3;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.book-card-author{font-size:13px;color:var(--text-muted);margin-bottom:8px}.book-card-price{font-size:18px;font-weight:700;color:var(--accent)}.stars{color:var(--star);font-size:14px;letter-spacing:1px}.badge{display:inline-block;padding:2px 8px;border-radius:4px;font-size:11px;font-weight:600;text-transform:uppercase}.badge-new{background:var(--accent-light);color:var(--accent)}.badge-bestseller{background:#fef3c7;color:var(--orange)}.footer{background:var(--bg-footer);color:#d1d5db;padding:56px 0 24px;margin-top:0}.footer a{color:#9ca3af;display:block;padding:3px 0;font-size:13px}.footer a:hover{color:#fff;text-decoration:none}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding-bottom:40px;border-bottom:1px solid #374151}.footer-brand p{font-size:13px;line-height:1.6;margin-top:8px;max-width:300px}.footer-logo{font-size:18px;font-weight:700;color:#fff}.footer-heading{font-size:12px;font-weight:600;text-transform:uppercase;color:#9ca3af;margin-bottom:12px;letter-spacing:.5px}.footer-col{display:flex;flex-direction:column}.footer-bottom{display:flex;justify-content:space-between;align-items:center;padding-top:20px;font-size:12px;color:#6b7280}.footer-payment{display:flex;align-items:center;gap:6px}.footer-payment strong{color:#9ca3af}.product-detail-grid{display:grid;grid-template-columns:1fr 1.5fr;gap:40px;padding:40px 0}.product-detail-cover{width:100%;border-radius:var(--radius);box-shadow:var(--shadow-lg)}.product-detail-title{font-size:28px;font-weight:700;line-height:1.2;margin-bottom:8px}.product-detail-author{font-size:16px;color:var(--text-muted);margin-bottom:16px}.product-detail-price{font-size:24px;font-weight:700;color:var(--accent);margin-bottom:20px}.product-detail-desc{font-size:15px;color:var(--text);line-height:1.7;margin-bottom:24px}.review-card{padding:16px 0;border-bottom:1px solid var(--border)}.review-header{display:flex;align-items:center;gap:12px;margin-bottom:8px}.review-author{font-weight:600;font-size:14px}.review-date{font-size:12px;color:var(--text-light)}.review-body{font-size:14px;line-height:1.6}.verified-badge{font-size:11px;color:var(--green);font-weight:600}.download-card{background:var(--bg-card);border:2px solid var(--green);border-radius:12px;padding:32px;text-align:center;max-width:500px;margin:40px auto}@media (max-width: 1024px){.product-grid{grid-template-columns:repeat(3,1fr)}.category-grid,.value-grid{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:1fr 1fr;gap:32px}}@media (max-width: 768px){.topbar,.header-search,.header-nav{display:none}.mobile-menu-btn,.mobile-nav{display:block}.hero{padding:48px 0 40px}.hero-title{font-size:32px}.hero-subtitle{font-size:15px}.hero-search{flex-direction:column;border-radius:var(--radius)}.hero-search-btn{border-radius:0 0 var(--radius) var(--radius)}.hero-stats{gap:24px}.hero-stat strong{font-size:20px}.product-grid{grid-template-columns:repeat(2,1fr);gap:12px}.category-grid{grid-template-columns:repeat(2,1fr)}.value-grid{grid-template-columns:1fr 1fr;gap:16px}.product-detail-grid{grid-template-columns:1fr;gap:24px}.book-grid{grid-template-columns:repeat(auto-fill,minmax(200px,1fr))}.container{padding:0 16px}.section{padding:40px 0}.footer-grid{grid-template-columns:1fr;gap:24px}.footer-bottom{flex-direction:column;gap:8px;text-align:center}.newsletter-form{flex-direction:column}}@media (max-width: 480px){.product-grid{grid-template-columns:1fr}.hero-title{font-size:28px}}