:root{--color-bg: #030014;--color-surface: #0f0c29;--color-surface-translucent: rgba(15, 12, 41, .7);--color-primary: #a855f7;--color-primary-glow: rgba(168, 85, 247, .5);--color-secondary: #06b6d4;--color-text-main: #ffffff;--color-text-muted: #94a3b8;--color-border: rgba(255, 255, 255, .1);--font-main: "Outfit", system-ui, sans-serif;--gradient-main: linear-gradient(135deg, #a855f7 0%, #06b6d4 100%);--gradient-text: linear-gradient(to right, #c084fc, #67e8f9);--shadow-card: 0 8px 32px 0 rgba(0, 0, 0, .37)}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:var(--font-main);background-color:var(--color-bg);background-image:radial-gradient(circle at 15% 50%,rgba(168,85,247,.08) 0%,transparent 25%),radial-gradient(circle at 85% 30%,rgba(6,182,212,.08) 0%,transparent 25%);color:var(--color-text-main);line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased}a{text-decoration:none;color:inherit;transition:opacity 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3rem;font-size:1.2rem}.navbar{display:flex;justify-content:space-between;align-items:center;padding:1.5rem 2rem;position:fixed;top:0;width:100%;z-index:1000;background:#030014cc;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--color-border)}.logo{display:flex;align-items:center}.logo-desktop{height:40px;width:auto;object-fit:contain;display:block}.logo-mobile{height:32px;width:auto;object-fit:contain;display:none}.nav-links{display:flex;gap:2rem;align-items:center}.nav-links a:hover{color:var(--color-secondary)}.btn-nav{background:var(--color-primary);padding:.5rem 1.5rem;border-radius:20px;font-size:.9rem}.mobile-menu-btn{display:none;background:none;border:none;cursor:pointer;flex-direction:column;gap:6px}.mobile-menu-btn 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.highlight{color:transparent;background:var(--gradient-text);-webkit-background-clip:text;background-clip:text}.hero-description{font-size:1.25rem;color:var(--color-text-muted);margin-bottom:2.5rem;line-height:1.6}.cta-group{justify-content:flex-start}.hero-visual{display:flex;justify-content:center;align-items:center;perspective:1000px}.flashcard-scene{position:relative;width:320px;height:480px;transform-style:preserve-3d}.flashcard-stack{position:relative;width:100%;height:100%;transform-style:preserve-3d;animation:floatingCards 6s ease-in-out infinite}.flashcard{position:absolute;width:100%;height:100%;border-radius:20px;background:#0f0c29f2;border:1px solid rgba(255,255,255,.1);box-shadow:0 15px 35px #00000080;display:flex;flex-direction:column;overflow:hidden;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);transition:all .5s ease}.card-1{z-index:3;transform:rotateY(-10deg) rotate(-2deg);background:linear-gradient(145deg,#1e1b4b,#0f0c29);border:1px solid 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rotate(20deg);opacity:.6}.card-header{margin-bottom:2rem;font-size:.9rem;color:var(--color-primary);font-weight:600;text-transform:uppercase;letter-spacing:1px}.main-content{flex-grow:1;display:flex;flex-direction:column;justify-content:center}.term{font-size:2.5rem;font-weight:700;margin-bottom:.5rem;color:#fff}.phonetic{font-family:monospace;color:var(--color-text-muted);font-size:1.2rem;margin-bottom:1.5rem}.definition{font-size:1.1rem;line-height:1.5;margin-bottom:1.5rem;color:#e2e8f0}.example{background:#ffffff0d;padding:1rem;border-radius:8px;font-style:italic;color:var(--color-secondary);border-left:3px solid var(--color-secondary)}.card-footer{padding-top:1.5rem;border-top:1px solid rgba(255,255,255,.1);margin-top:auto}.mastery-level{display:flex;align-items:center;justify-content:space-between;font-size:.8rem;color:var(--color-text-muted)}.progress-bar{width:60px;height:6px;background:#ffffff1a;border-radius:3px;overflow:hidden}.progress-bar 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p{color:var(--color-text-muted);font-size:.9rem}.center-cta{text-align:center}.audience-list{max-width:800px;margin:0 auto;display:grid;gap:1rem}.audience-list li{background:#ffffff08;padding:1rem 1.5rem;border-radius:8px;display:flex;align-items:center;gap:1rem;border-left:3px solid var(--color-secondary)}.check{color:var(--color-secondary);font-weight:700}.expect-grid{display:flex;flex-wrap:wrap;justify-content:center;gap:1rem}.expect-item{background:#a855f71a;border:1px solid rgba(168,85,247,.2);padding:.8rem 1.5rem;border-radius:50px;font-size:.95rem;color:#e9d5ff}.testimonials-section{background:#ffffff05}.testimonials-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem}.testimonial-card{background:var(--color-surface);padding:2rem;border-radius:16px;position:relative;border:1px solid var(--color-border)}.testimonial-card p{font-style:italic;margin-bottom:1.5rem;color:#e2e8f0}.testimonial-card .author{font-weight:600;color:var(--color-primary)}.download-section{padding:8rem 0;background:radial-gradient(circle at center,rgba(168,85,247,.1) 0%,transparent 60%)}.download-section h2{font-size:3rem;margin-bottom:1rem}.download-section p{color:var(--color-text-muted);margin-bottom:2rem;font-size:1.2rem}.cta-pulse{animation:pulse 2s infinite}@keyframes pulse{0%{box-shadow:0 0 #a855f766}70%{box-shadow:0 0 0 15px #a855f700}to{box-shadow:0 0 #a855f700}}.newsletter-form{max-width:500px;margin:2rem auto 0;display:flex;gap:.5rem}.newsletter-form input{flex:1;padding:1rem;border-radius:50px;border:1px solid var(--color-border);background:#ffffff0d;color:#fff;outline:none}.newsletter-form input:focus{border-color:var(--color-primary)}.footer{border-top:1px solid var(--color-border);padding:4rem 0 2rem;background:#02000d}.footer-content{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem;flex-wrap:wrap;gap:2rem}.footer-brand{font-size:1.5rem;font-weight:700}.footer-social{display:flex;gap:1.5rem}.footer-social a:hover{color:var(--color-primary)}.footer-bottom{text-align:center;color:var(--color-text-muted);font-size:.9rem}.fade-in{opacity:0;transform:translateY(20px);transition:opacity .6s ease-out,transform .6s ease-out}.fade-in.visible{opacity:1;transform:translateY(0)}.fade-in-up{animation:fadeInUp 1s ease-out forwards}@keyframes fadeInUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}@media(max-width:900px){.hero-split{grid-template-columns:1fr;text-align:center;gap:3rem}.hero-text{max-width:100%;text-align:center;order:1}.hero-visual{order:2;transform:scale(.9)}.cta-group{justify-content:center}}@media(max-width:768px){.hero-title{font-size:2.5rem}.logo-desktop{display:none}.logo-mobile{display:block}.nav-links{display:none}.mobile-menu-btn{display:flex}.cta-group{flex-direction:column;align-items:center}.btn{width:100%;max-width:300px;text-align:center}.newsletter-form{flex-direction:column}.newsletter-form button{width:100%}.container{padding:0 1.5rem}}.hidden{display:none}.ebooks-list{animation:fadeIn .5s ease-out}.list-header{display:flex;align-items:center;gap:2rem;margin-bottom:2rem}.list-header h3{font-size:2rem;background:var(--gradient-text);-webkit-background-clip:text;background-clip:text;color:transparent}.products-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:2rem}.product-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:12px;padding:1.5rem;transition:transform .3s;display:flex;flex-direction:column;height:100%}.product-card:hover{transform:translateY(-5px);border-color:var(--color-primary);box-shadow:0 10px 30px #0000004d}.product-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:.5rem}.product-header h4{font-size:1.2rem;color:#fff;margin-right:1rem}.price{color:var(--color-secondary);font-weight:700;font-size:1.1rem}.product-card .author{color:var(--color-text-muted);font-size:.9rem;margin-bottom:1rem}.prod-desc{font-size:.95rem;margin-bottom:1.5rem;flex-grow:1;text-align:justify}.tags{display:flex;gap:.5rem;margin-bottom:1.5rem;flex-wrap:wrap}.tag{background:#a855f71a;color:#d8b4fe;padding:.25rem .75rem;border-radius:20px;font-size:.8rem}.btn-full{width:100%;text-align:center;margin-top:auto}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.product-detail-container{padding-top:120px;min-height:80vh;margin-bottom:5rem}.back-link{display:inline-block;margin-bottom:2rem;color:var(--color-text-muted);font-weight:500}.back-link:hover{color:var(--color-primary);transform:translate(-5px)}.product-wrapper{display:grid;grid-template-columns:1fr 1fr;gap:4rem;align-items:center}.product-image{background:radial-gradient(circle at center,rgba(168,85,247,.1) 0%,transparent 70%);padding:3rem;border-radius:20px;display:flex;justify-content:center;perspective:1000px}.mockup-cover{width:300px;height:450px;background:linear-gradient(135deg,#1e1b4b,#312e81);border-radius:8px 16px 16px 8px;box-shadow:-10px 10px 20px #00000080,inset 2px 0 5px #ffffff1a;position:relative;display:flex;align-items:center;justify-content:center;font-size:1.5rem;font-weight:700;color:#fff3;transform:rotateY(-15deg) rotateX(5deg);transition:transform .5s ease}.mockup-cover:hover{transform:rotateY(0) rotateX(0)}.mockup-spine{position:absolute;left:0;top:0;bottom:0;width:15px;background:#ffffff1a;border-radius:8px 0 0 8px}.product-info{display:flex;flex-direction:column;gap:1.5rem}.badge{background:var(--color-secondary);color:#000;padding:.3rem .8rem;border-radius:50px;font-size:.8rem;font-weight:700;align-self:flex-start;text-transform:uppercase}.product-title{font-size:3rem;line-height:1.1}.product-author{color:var(--color-text-muted);font-size:1.1rem}.product-price-box{display:flex;align-items:baseline;gap:1rem}.product-card-thumb{width:100%;height:200px;object-fit:cover;border-radius:8px;margin-bottom:1rem}.book-cover-detail{width:100%;max-width:400px;border-radius:12px;box-shadow:0 20px 50px #00000080;transition:transform .3s ease}.book-cover-detail:hover{transform:scale(1.02)}.current-price{font-size:2.5rem;font-weight:700;color:var(--color-primary)}.original-price{font-size:1.2rem;color:var(--color-text-muted);text-decoration:line-through}.product-description{color:#e2e8f0;line-height:1.8}.product-specs{background:#ffffff08;padding:1.5rem;border-radius:12px;border:1px solid var(--color-border)}.product-specs h3{margin-bottom:1rem;font-size:1.1rem}.product-specs ul li{margin-bottom:.5rem;color:var(--color-text-muted)}.product-specs strong{color:#fff}.action-buttons{display:flex;gap:1rem;margin-top:1rem}.guarantee{display:flex;gap:1.5rem;margin-top:1rem;font-size:.9rem;color:var(--color-text-muted)}@media(max-width:850px){.product-wrapper{grid-template-columns:1fr;text-align:center}.product-image{padding:1rem}.badge,.product-price-box,.product-specs{align-self:center;justify-content:center;text-align:left}.action-buttons{justify-content:center;flex-wrap:wrap}.guarantee{justify-content:center}}.category-section{margin-bottom:4rem}.category-header-title{font-size:2rem;margin-bottom:2rem;display:inline-block}