:root{--bg-color: #0d0d0d;--card-bg: rgba(255, 255, 255, .03);--card-border: rgba(255, 255, 255, .1);--accent-color: #00f2fe;--accent-secondary: #4facfe;--text-primary: #ffffff;--text-secondary: #a0a0a0;--glass-bg: rgba(255, 255, 255, .05);--glass-blur: blur(20px);--transition-smooth: all .4s cubic-bezier(.4, 0, .2, 1);--font-main: "Inter", sans-serif;--font-heading: "Inter", sans-serif;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--space-16: 4rem;--space-20: 5rem}*{margin:0;padding:0;box-sizing:border-box}@media(max-width:768px){*{line-height:1.4!important}}body{background-color:var(--bg-color);color:var(--text-primary);font-family:var(--font-main);line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:var(--bg-color)}::-webkit-scrollbar-thumb{background:var(--card-border);border-radius:10px}::-webkit-scrollbar-thumb:hover{background:var(--accent-color)}.app-container{min-height:100vh;padding:var(--space-8);max-width:1400px;margin:0 auto;position:relative}@media(max-width:768px){.app-container{padding:var(--space-6)}}h1{font-family:var(--font-heading);font-size:clamp(2.5rem,8vw,4.5rem);font-weight:800;letter-spacing:-.04em;line-height:1.25;text-align:center;margin-bottom:var(--space-2);background:linear-gradient(to right,var(--accent-color),var(--accent-secondary));background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent}.subtitle{text-align:center;color:var(--text-secondary);font-size:1.1rem;margin:var(--space-2) auto var(--space-8) auto;font-weight:300;max-width:800px;line-height:1.6}@media(max-width:768px){.subtitle{font-size:1rem;margin-bottom:var(--space-6);padding:0 var(--space-2)}}.glass-effect{background:var(--glass-bg);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:1px solid var(--card-border)}.skip-link{position:absolute;top:-100px;left:0;background:var(--accent-color);color:var(--bg-color);padding:1rem;z-index:1000;transition:top .3s;font-weight:700;text-decoration:none;border-radius:0 0 12px}.skip-link:focus{top:0}@keyframes fadeInScale{0%{opacity:0;transform:scale(.95) translateY(10px)}to{opacity:1;transform:scale(1) translateY(0)}}.animate-in{animation:fadeInScale .6s cubic-bezier(.2,.8,.2,1) forwards}.delay-1{animation-delay:.1s}.delay-2{animation-delay:.2s}.delay-3{animation-delay:.3s}.delay-4{animation-delay:.4s}@media(prefers-reduced-motion:reduce){.animate-in{animation:none;opacity:1;transform:none}}@keyframes wiggle{0%,to{transform:translate(0)}15%{transform:translate(-4px)}30%{transform:translate(4px)}45%{transform:translate(-4px)}60%{transform:translate(4px)}75%{transform:translate(-2px)}85%{transform:translate(2px)}}.wiggle{animation:wiggle .5s ease-in-out;animation-delay:1.5s}@media(prefers-reduced-motion:reduce){.wiggle{animation:none}}@keyframes butterflywandering{0%{opacity:0;transform:scale(1) translate(0) rotate(0)}15%{opacity:1;transform:scale(1.3) translate(30px,-50px) rotate(15deg)}40%{transform:scale(1.1) translate(-40px,-110px) rotate(-15deg)}70%{opacity:1;transform:scale(.9) translate(60px,-200px) rotate(20deg)}90%{transform:scale(.8) translate(-20px,-300px) rotate(-10deg)}to{opacity:0;transform:scale(.8) translate(120px,-450px) rotate(25deg)}}@keyframes heartFold{0%{opacity:1;transform:scale(1) rotateY(0)}60%{opacity:1;transform:scale(1.2) rotateY(0)}to{opacity:0;transform:scale(.8) rotateY(90deg)}}@keyframes leftWingFlap{0%{opacity:0;transform:rotateY(90deg)}20%{opacity:1;transform:rotateY(90deg)}40%,60%,80%,to{transform:rotateY(-110deg)}50%,70%,90%{transform:rotateY(0)}}@keyframes rightWingFlap{0%{opacity:0;transform:rotateY(-90deg)}20%{opacity:1;transform:rotateY(-90deg)}40%,60%,80%,to{transform:rotateY(110deg)}50%,70%,90%{transform:rotateY(0)}}.butterfly-wandering{animation:butterflywandering 4s ease-in-out forwards}.heart-fold{animation:heartFold .8s ease-in-out forwards;animation-delay:.5s}.left-wing-flap{animation:leftWingFlap .4s ease-in-out infinite;animation-delay:.8s}.right-wing-flap{animation:rightWingFlap .4s ease-in-out infinite;animation-delay:.8s}.header-section{margin-bottom:var(--space-8);position:relative}@media(max-width:768px){.header-section{margin-bottom:var(--space-6);padding-top:var(--space-12)}}.header-section:before{content:"";position:absolute;top:-100px;left:50%;transform:translate(-50%);width:300px;height:300px;background:radial-gradient(circle,var(--accent-color) 0%,transparent 70%);opacity:.15;filter:blur(60px);z-index:-1}.category-bar-wrapper{position:sticky;top:var(--space-4);z-index:100;margin-bottom:var(--space-8);display:flex;justify-content:center}@media(max-width:768px){.category-bar-wrapper{top:var(--space-2);margin-bottom:var(--space-4)}}.category-bar{padding:var(--space-3) var(--space-8);border-radius:50px;display:flex;gap:var(--space-2);overflow-x:auto;max-width:90vw;scrollbar-width:none;-ms-overflow-style:none;-webkit-overflow-scrolling:touch;background:var(--bg-color);border:1px solid var(--card-border)}.category-bar::-webkit-scrollbar{display:none}.category-btn{padding:var(--space-3) var(--space-6);border-radius:40px;border:none;background:transparent;color:var(--text-secondary);font-family:var(--font-main);font-size:.9rem;font-weight:500;cursor:pointer;white-space:nowrap;transition:var(--transition-smooth);flex-shrink:0}@media(max-width:768px){.category-btn{padding:var(--space-2) var(--space-4);font-size:.85rem}}.category-btn.active{background:var(--text-primary);color:var(--bg-color);box-shadow:0 4px 15px #fff3}.category-btn:hover:not(.active){color:var(--text-primary);background:#ffffff0d}.category-summary{text-align:center;max-width:700px;margin:var(--space-6) auto;color:var(--text-secondary);font-size:1rem;line-height:1.6;padding:0 var(--space-4)}@media(max-width:768px){.category-summary{margin:var(--space-4) auto;font-size:.9rem;padding:0 var(--space-2)}}.books-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:var(--space-8);padding:var(--space-4) 0;justify-content:center}@media(max-width:768px){.books-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:var(--space-6)}}@media(max-width:480px){.books-grid{grid-template-columns:1fr}}.book-card{border-radius:24px;padding:0;display:flex;flex-direction:column;transition:var(--transition-smooth);height:100%;position:relative;overflow:visible;perspective:1000px;margin:0 auto;width:100%}.book-card:hover{transform:translateY(-10px);border-color:var(--accent-color);box-shadow:0 20px 40px #0006}.book-image-container{width:90%;margin:0 auto var(--space-4) auto;aspect-ratio:3/4;border-radius:12px;overflow:hidden;background:#ffffff08;display:flex;align-items:center;justify-content:center}.book-image{width:100%;height:100%;object-fit:contain;transition:transform .6s cubic-bezier(.33,1,.68,1)}.book-card:hover .book-image{transform:scale(1.05)}.book-info{flex-grow:1;display:flex;flex-direction:column;margin-top:var(--space-2)}.book-category{font-size:.75rem;text-transform:uppercase;letter-spacing:1px;color:var(--accent-color);margin-bottom:var(--space-2);font-weight:600}.book-title{font-size:1.1rem;font-weight:600;margin-bottom:var(--space-6);display:-webkit-box;-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:3.2rem}@media(max-width:768px){.book-title{margin-bottom:var(--space-4);font-size:1rem;min-height:2.8rem}}.buy-button{width:100%;padding:var(--space-4);border-radius:12px;border:1px solid var(--accent-color);background:transparent;color:var(--accent-color);font-family:var(--font-main);font-size:.95rem;font-weight:600;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:var(--space-2);text-decoration:none;transition:var(--transition-smooth)}.buy-button:hover{background:var(--accent-color);color:var(--bg-color)}.book-card-link{padding:var(--space-5);padding-bottom:var(--space-2);text-decoration:none;color:inherit;display:block}.book-info-actions{padding:0 var(--space-5) var(--space-5) var(--space-5)}.nav-bar{display:flex;justify-content:center;gap:var(--space-4);margin-bottom:var(--space-8);flex-wrap:wrap}.nav-btn{padding:var(--space-3) var(--space-6);border-radius:12px;border:1px solid var(--card-border);background:transparent;color:var(--text-secondary);font-family:var(--font-main);font-size:.95rem;font-weight:500;cursor:pointer;display:flex;align-items:center;gap:var(--space-2);transition:var(--transition-smooth)}.nav-btn.active{background:var(--accent-color);color:var(--bg-color);border-color:var(--accent-color)}.nav-btn:hover:not(.active){border-color:var(--accent-color);color:var(--text-primary)}.favorites-btn.active{background:#ff6b6b;border-color:#ff6b6b}.favorite-btn{position:absolute;top:var(--space-4);right:var(--space-4);width:36px;height:36px;border-radius:50%;border:none;background:#00000080;color:var(--text-secondary);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:var(--transition-smooth);z-index:10}.favorite-btn:hover{background:#000000b3;color:#ff6b6b;transform:scale(1.1)}.favorite-btn.is-favorite{color:#ff6b6b;background:#ff6b6b33}.empty-state{grid-column:1 / -1;text-align:center;padding:4rem 2rem;color:var(--text-secondary);font-size:1.2rem}.language-switcher-container{position:absolute;top:var(--space-6);right:var(--space-6);z-index:1000}@media(max-width:768px){.language-switcher-container{top:var(--space-4);right:var(--space-4)}}.language-btn{display:flex;align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-4);border-radius:99px;font-weight:600;font-size:.8rem;cursor:pointer;transition:var(--transition-smooth);border:1px solid var(--card-border);background:var(--glass-bg);backdrop-filter:var(--glass-blur);color:var(--text-primary)}.language-btn:hover{border-color:var(--accent-color);background:#ffffff1a;transform:translateY(-2px)}.language-btn svg{color:var(--accent-color)}.lang-label{text-transform:uppercase;letter-spacing:.05em}.footer{margin-top:var(--space-16);text-align:center;color:var(--text-secondary);padding:var(--space-8)}.footer-links{margin-top:var(--space-4)}.footer-feedback-link{background:none;border:none;color:var(--accent-secondary);text-decoration:underline;cursor:pointer;font-size:.9rem}.footer-disclosure{font-size:.8rem;margin-top:var(--space-4);opacity:.8}.about-container{max-width:800px;margin:var(--space-8) auto;padding:var(--space-12);border-radius:24px;color:var(--text-primary);line-height:1.8}.about-header{text-align:center;margin-bottom:var(--space-8)}.about-profile-icon{width:80px;height:80px;background:linear-gradient(135deg,var(--accent-color),var(--accent-secondary));border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto var(--space-6) auto}.about-title{font-family:var(--font-heading);font-size:2.5rem;margin-bottom:var(--space-2)}.about-content{font-size:1.1rem;color:var(--text-secondary)}.about-disclosure-box{margin-bottom:var(--space-8);padding:var(--space-6);background:#ffffff0d;border-radius:12px;border-left:4px solid var(--accent-color)}.about-closing-text{margin-bottom:var(--space-8);font-style:italic;color:var(--accent-color)}.about-actions{text-align:center}.btn-linkedin{display:inline-flex!important;width:auto!important;padding:var(--space-4) var(--space-8)!important;text-decoration:none}.category-page-cta{display:inline-flex!important;width:auto!important;margin-top:var(--space-6);padding:var(--space-4) var(--space-10)!important;font-size:1rem}.category-page-hint{text-align:center;color:var(--text-secondary);font-size:.85rem;font-weight:300;margin-top:var(--space-3);opacity:.7;font-style:italic}.language-page-container{min-height:100vh;padding:var(--space-12) var(--space-6);display:flex;justify-content:center;align-items:flex-start}.language-page-content{max-width:720px;width:100%}.language-page-header{text-align:center;margin-bottom:var(--space-16);position:relative}.language-page-header .back-btn{position:absolute;left:0;top:50%;transform:translateY(-50%);background:var(--card-bg);border:1px solid var(--card-border);color:var(--text-primary);width:48px;height:48px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:var(--transition-smooth)}.language-page-header .back-btn:hover{background:var(--accent-color);color:var(--bg-color);border-color:var(--accent-color);transform:translateY(-50%) translate(-5px)}.language-page-header h1{font-size:3.5rem;font-weight:800;background:linear-gradient(to right,#fff,var(--accent-color));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:var(--space-4)}.language-page-subtitle{color:var(--text-secondary);font-size:1.2rem}.language-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:var(--space-3);margin-bottom:var(--space-16)}.language-card{padding:var(--space-4) var(--space-5);border-radius:16px;display:flex;justify-content:space-between;align-items:center;text-align:left;cursor:pointer;border:1px solid transparent}.language-card.active{background:#00f2fe1a;border-color:var(--accent-color)}.language-card-info{display:flex;flex-direction:column;gap:var(--space-1)}.language-card .native-name{font-size:1.05rem;font-weight:700;color:var(--text-primary)}.language-card .english-name{font-size:.7rem;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px}.selected-indicator{background:var(--accent-color);color:var(--bg-color);width:22px;height:22px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0}.language-page-footer{text-align:center;padding:var(--space-12);display:flex;flex-direction:column;align-items:center;gap:var(--space-6);border-top:1px solid var(--card-border)}.footer-icon{color:var(--accent-color);opacity:.5}@media(max-width:768px){.language-page-header h1{font-size:2.5rem}.language-page-header .back-btn{position:static;transform:none;margin:0 auto var(--space-6) auto}.language-page-header .back-btn:hover{transform:translateY(-5px)}.language-grid{grid-template-columns:repeat(2,1fr)}}