:root{--primary:#00d4ff;--accent:#0fc;--dark:#0a0e1a;--dark-lighter:#141824;--text:#e0e0e0;--text-secondary:#a0a0a0;--border:rgba(0,212,255,.2)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background:var(--dark);color:var(--text);line-height:1.6;overflow-x:hidden}.container{max-width:1200px;margin:0 auto;padding:0 20px}.site-header{background:rgba(10,14,26,.95);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);position:fixed;top:0;left:0;right:0;z-index:1000;height:80px}.header-container{max-width:1200px;margin:0 auto;padding:0 30px;height:100%;display:flex;align-items:center;justify-content:space-between}.site-logo img{height:50px;width:auto}.main-navigation ul{list-style:none;display:flex;gap:40px;margin:0;padding:0}.main-navigation a{color:var(--text);text-decoration:none;font-weight:500;transition:color .3s;padding:10px 0;display:inline-block}.main-navigation a:hover,.main-navigation a.active{color:var(--primary)}.menu-toggle{display:none;background:0 0;border:none;color:var(--primary);font-size:24px;cursor:pointer;padding:8px;transition:transform .3s}.menu-toggle.active{transform:rotate(90deg)}.menu-toggle span{display:block;width:25px;height:3px;background:var(--primary);margin:5px 0;transition:all .3s}.menu-toggle.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}.menu-toggle.active span:nth-child(2){opacity:0}.menu-toggle.active span:nth-child(3){transform:rotate(-45deg) translate(7px,-6px)}.mobile-overlay{display:none;position:fixed;top:70px;left:0;right:0;bottom:0;background:rgba(0,0,0,.8);backdrop-filter:blur(5px);z-index:998}.mobile-overlay.active{display:block}.hero-section{min-height:100vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:100px 20px 50px;background:linear-gradient(135deg,#0a0e1a 0%,#141824 100%)}.hero-content h1{font-size:clamp(2rem, 5vw, 4rem);font-weight:700;margin-bottom:20px;background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-content .tagline{font-size:clamp(1rem, 2vw, 1.5rem);color:var(--text-secondary);margin-bottom:40px;max-width:800px;margin-left:auto;margin-right:auto}.btn{display:inline-block;padding:14px 32px;border-radius:8px;text-decoration:none;font-weight:600;transition:all .3s;border:2px solid transparent;cursor:pointer;font-size:16px}.btn-primary{background:var(--primary);color:var(--dark)}.btn-primary:hover{background:0 0;color:var(--primary);border-color:var(--primary);transform:translateY(-2px)}.btn-secondary{background:0 0;color:var(--text);border-color:var(--text-secondary)}.btn-secondary:hover{border-color:var(--primary);color:var(--primary)}.btn-secondary:disabled{opacity:.5;cursor:not-allowed}.btn-accent{background:var(--accent);color:var(--dark)}.btn-accent:hover{background:0 0;color:var(--accent);border-color:var(--accent);transform:translateY(-2px)}.btn-large{padding:18px 40px;font-size:18px}.btn-small{padding:10px 20px;font-size:14px}.btn-block{display:block;width:100%;text-align:center}.btn i{margin-right:8px}.obra-page{padding-top:80px}.obra-hero{background:linear-gradient(135deg,#0a0e1a 0%,#141824 100%);padding:100px 20px;text-align:center}.obra-hero h1{font-size:clamp(2rem, 4vw, 3.5rem);font-weight:700;margin-bottom:20px;color:var(--primary)}.obra-hero .subtitle{font-size:clamp(1.2rem, 3vw, 2rem);color:var(--accent);margin-bottom:15px;font-weight:600}.obra-hero .tagline{font-size:clamp(1rem, 2vw, 1.2rem);color:var(--text-secondary);max-width:800px;margin:0 auto}.libro-section{padding:80px 20px;background:var(--dark)}.libro-content{display:grid;grid-template-columns:1fr 2fr;gap:60px;align-items:start}.libro-cover img{width:100%;height:auto;border-radius:12px;box-shadow:0 20px 40px rgba(0,212,255,.3)}.libro-info h2{font-size:2.5rem;color:var(--primary);margin-bottom:10px}.libro-info .author{font-size:1.2rem;color:var(--accent);margin-bottom:30px}.libro-description{margin-bottom:40px}.libro-description p{margin-bottom:20px;line-height:1.8;color:var(--text)}.libro-description blockquote{background:var(--dark-lighter);border-left:4px solid var(--primary);padding:20px;margin:30px 0;font-style:italic;color:var(--accent)}.libro-actions{display:flex;gap:15px;flex-wrap:wrap}.aprenderas-section{padding:80px 20px;background:var(--dark-lighter)}.aprenderas-section h2{text-align:center;font-size:2.5rem;margin-bottom:60px;color:var(--primary)}.topics-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px, 1fr));gap:30px}.topic-card{background:var(--dark);border:2px solid var(--border);border-radius:12px;padding:30px;transition:all .3s}.topic-card:hover{border-color:var(--primary);transform:translateY(-5px);box-shadow:0 10px 30px rgba(0,212,255,.2)}.topic-card .icon{font-size:3rem;color:var(--primary);margin-bottom:20px}.topic-card h3{font-size:1.5rem;margin-bottom:15px;color:var(--accent)}.topic-card p{color:var(--text-secondary);line-height:1.6}.capitulos-section{padding:80px 20px;background:var(--dark)}.capitulos-section h2{text-align:center;font-size:2.5rem;margin-bottom:60px;color:var(--primary)}.capitulos-list{max-width:900px;margin:0 auto}.capitulo-item{background:var(--dark-lighter);border-left:4px solid var(--primary);padding:25px 30px;margin-bottom:20px;border-radius:8px;transition:all .3s}.capitulo-item:hover{border-left-color:var(--accent);transform:translateX(10px);box-shadow:0 5px 20px rgba(0,212,255,.1)}.capitulo-item .numero{display:inline-block;background:var(--primary);color:var(--dark);padding:5px 15px;border-radius:20px;font-weight:700;font-size:.9rem;margin-bottom:10px}.capitulo-item h3{font-size:1.3rem;margin-bottom:8px;color:var(--text)}.capitulo-item p{color:var(--text-secondary);font-size:.95rem}.cta-section{padding:100px 20px;background:linear-gradient(135deg,#0a0e1a 0%,#141824 100%)}.cta-box{text-align:center;max-width:700px;margin:0 auto;padding:60px 40px;background:var(--dark-lighter);border:2px solid var(--primary);border-radius:16px}.cta-box h2{font-size:2.5rem;margin-bottom:20px;color:var(--primary)}.cta-box p{font-size:1.1rem;color:var(--text-secondary);margin-bottom:30px}.privacy-note{font-size:.9rem;color:var(--text-secondary);margin-top:20px}.privacy-note i{color:var(--accent);margin-right:5px}.modal{display:none;position:fixed;top:0;left:0;right:0;bottom:0;z-index:2000}.modal.active{display:flex;align-items:center;justify-content:center}.modal-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.9);backdrop-filter:blur(5px)}.modal-container{position:relative;max-width:500px;width:90%;max-height:90vh;overflow-y:auto;z-index:2001}.modal-content{background:var(--dark);border-radius:16px;padding:40px 30px;border:2px solid var(--primary)}.modal-close{position:absolute;top:-15px;right:-15px;width:40px;height:40px;background:var(--primary);color:var(--dark);border:none;border-radius:50%;font-size:24px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .3s}.modal-close:hover{transform:rotate(90deg);background:var(--accent)}.modal-header{text-align:center;margin-bottom:30px}.modal-header i{font-size:48px;color:var(--primary);margin-bottom:15px}.modal-header h2{font-size:24px;margin-bottom:10px;color:var(--primary)}.modal-header p{color:var(--text-secondary);font-size:14px}.email-form{margin-bottom:20px}.form-group{position:relative;margin-bottom:20px}.form-group input{width:100%;padding:15px;background:var(--dark-lighter);border:2px solid var(--border);border-radius:8px;color:var(--text);font-size:16px;transition:border-color .3s}.form-group input:focus{outline:none;border-color:var(--primary)}.form-group label{position:absolute;left:15px;top:50%;transform:translateY(-50%);color:var(--text-secondary);pointer-events:none;transition:all .3s}.form-group input:focus+label,.form-group input:not(:placeholder-shown)+label{top:-10px;font-size:12px;color:var(--primary);background:var(--dark);padding:0 5px}.modal-footer{text-align:center;margin-top:20px}.modal-footer p{font-size:13px;color:var(--text-secondary)}.modal-footer i{color:var(--accent);margin-right:5px}.site-footer{background:var(--dark-lighter);border-top:1px solid var(--border);padding:40px 20px;text-align:center}.footer-content p{color:var(--text-secondary);margin-bottom:15px}.footer-content a{color:var(--primary);text-decoration:none}.footer-content a:hover{color:var(--accent)}.social-links{display:flex;justify-content:center;gap:20px;margin-top:20px}.social-links a{color:var(--text);font-size:24px;transition:color .3s}.social-links a:hover{color:var(--primary)}@media (max-width:768px){.site-header{height:70px}.header-container{padding:0 20px}.site-logo img{height:40px}.menu-toggle{display:block}.main-navigation{position:fixed;top:70px;right:-100%;width:280px;height:calc(100vh - 70px);background:var(--dark-lighter);border-left:1px solid var(--border);transition:right .3s;z-index:999}.main-navigation.active{right:0}.main-navigation ul{flex-direction:column;gap:0;padding:20px 0}.main-navigation li{border-bottom:1px solid var(--border)}.main-navigation a{display:block;padding:18px 30px}.obra-page{padding-top:70px}.obra-hero{padding:60px 20px}.libro-content{grid-template-columns:1fr;gap:40px}.libro-actions{flex-direction:column}.libro-actions .btn{width:100%}.topics-grid{grid-template-columns:1fr}.cta-box{padding:40px 25px}}@media (min-width:769px) and (max-width:1024px){.topics-grid{grid-template-columns:repeat(2,1fr)}}