:root{--bg:#0a0a0a;--alt:#111;--card:#161616;--text:#fff;--muted:#aaa;--accent:#0780ff;--border:#292929;--blue:#0d1d33}
*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:Inter,system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);line-height:1.65}a{color:inherit}.wrap{width:min(1100px,calc(100% - 2.5rem));margin:auto}
nav{position:sticky;top:0;z-index:10;background:rgba(10,10,10,.94);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}.nav{min-height:70px;display:flex;align-items:center;justify-content:space-between;gap:1rem}.brand{display:flex;align-items:center;gap:.7rem;text-decoration:none;font-weight:800}.brand img{width:48px;height:48px;object-fit:contain}.nav-links{display:flex;align-items:center;gap:1.25rem}.nav-links a{text-decoration:none;color:var(--muted);font-size:.92rem}.nav-links a:hover{color:#fff}.store-btn,.btn{display:inline-flex;align-items:center;justify-content:center;padding:.82rem 1.25rem;border-radius:8px;text-decoration:none;font-weight:750;border:1px solid transparent}.store-btn,.btn.primary{background:var(--accent);color:#fff}.btn.secondary{border-color:var(--border);color:#fff}.btn:hover,.store-btn:hover{transform:translateY(-1px)}
.hero{padding:5.5rem 0 3.6rem;background:radial-gradient(ellipse at center bottom,rgba(0,119,255,.15),transparent 65%);border-bottom:1px solid var(--border)}.eyebrow{display:inline-block;color:#59a7ff;text-transform:uppercase;letter-spacing:.16em;font-size:.76rem;font-weight:800;margin-bottom:.9rem}.hero h1{font-family:Montserrat,Inter,sans-serif;font-size:clamp(2.1rem,6vw,4rem);line-height:1.08;max-width:850px}.hero p{font-size:1.08rem;color:var(--muted);max-width:720px;margin-top:1.2rem}.hero-actions{display:flex;gap:.8rem;flex-wrap:wrap;margin-top:1.8rem}
.start{padding:3.8rem 0}.start h2,.section h2{font-family:Montserrat,Inter,sans-serif;font-size:clamp(1.65rem,4vw,2.3rem);line-height:1.2}.intro{color:var(--muted);max-width:720px;margin:.75rem 0 1.8rem}.quick-grid,.product-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem}.quick{display:block;padding:1.4rem;background:linear-gradient(145deg,rgba(0,119,255,.08),var(--card) 52%);border:1px solid var(--border);border-radius:14px;text-decoration:none}.quick:hover{border-color:var(--accent)}.quick strong{display:block;font-size:1.05rem;margin-bottom:.35rem}.quick span{color:var(--muted);font-size:.92rem}.quick em{display:block;color:#59a7ff;font-style:normal;font-weight:750;margin-top:.8rem;font-size:.86rem}
.section{padding:4rem 0;border-top:1px solid var(--border);scroll-margin-top:82px}.section.alt{background:var(--alt)}.product-grid{margin-top:1.6rem}.product{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:1.45rem;display:flex;flex-direction:column;min-height:220px}.product .label{color:#59a7ff;font-size:.74rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase}.product h3{font-size:1.08rem;line-height:1.35;margin:.55rem 0}.product p{color:var(--muted);font-size:.92rem;flex:1}.product a{color:#59a7ff;text-decoration:none;font-weight:750;margin-top:1rem;font-size:.9rem}.product a:hover{text-decoration:underline}
.note{margin-top:1.5rem;padding:1.25rem 1.4rem;border-left:3px solid var(--accent);background:var(--blue);color:#d8e9ff;border-radius:0 10px 10px 0}.final-cta{padding:4rem 0;text-align:center;background:linear-gradient(145deg,#0d1d33,#111)}.final-cta p{color:var(--muted);max-width:640px;margin:.8rem auto 1.5rem}.article{width:min(760px,calc(100% - 2.5rem));margin:auto;padding:4rem 0}.article h1{font-family:Montserrat,Inter,sans-serif;font-size:clamp(2rem,5vw,3.3rem);line-height:1.12}.article .lead{font-size:1.18rem;color:#d0d0d0;margin:1.4rem 0 2.4rem}.article h2{font-family:Montserrat,Inter,sans-serif;font-size:1.55rem;margin:2.4rem 0 .8rem}.article p,.article li{color:#c0c0c0}.article p{margin:.9rem 0}.article ul{padding-left:1.25rem;margin:.9rem 0}.article li{margin:.55rem 0}.quote{border-left:3px solid var(--accent);padding:1rem 1.25rem;margin:2rem 0;background:var(--card);font-size:1.08rem}.author-box{margin-top:3rem;padding:1.5rem;border:1px solid var(--border);border-radius:14px;background:var(--card)}
.featured-book{padding:3.5rem 0;background:linear-gradient(135deg,#0b1b2d,#111);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}.featured-book-grid{display:grid;grid-template-columns:220px 1fr;gap:2.5rem;align-items:center}.featured-book img{width:100%;box-shadow:0 18px 42px rgba(0,0,0,.5)}.featured-book h2{font-family:Montserrat,Inter,sans-serif;font-size:clamp(1.8rem,4vw,2.8rem);line-height:1.12}.featured-book p{color:var(--muted);margin:.8rem 0 1.25rem}.book-page{padding:2rem 0 4rem}.breadcrumbs{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center;color:#8797a4;font-size:.86rem;margin-bottom:1.5rem}.breadcrumbs a{color:#a9cdeb;text-decoration:none}.book-page-grid{display:grid;grid-template-columns:minmax(240px,340px) 1fr;gap:clamp(2rem,6vw,5rem);align-items:start}.book-media{position:sticky;top:95px}.book-page-cover{width:100%;display:block;box-shadow:0 24px 55px rgba(0,0,0,.55)}.book-device-image{display:block;width:100%;margin-top:1rem;border:1px solid #294761;border-radius:14px;box-shadow:0 18px 42px rgba(0,0,0,.45)}.book-page h1{font-family:Montserrat,Inter,sans-serif;font-size:clamp(2.25rem,6vw,4.2rem);line-height:1.02}.book-page .lead{font-size:1.18rem;color:#d3dfeb;margin:1rem 0}.book-page h2{font-family:Montserrat,Inter,sans-serif;font-size:1.6rem;margin:2.3rem 0 .75rem}.book-page p,.book-page li{color:#bfc5cb}.book-page ul{padding-left:1.2rem;margin:1rem 0}.book-page li{margin:.55rem 0}.book-facts{display:flex;flex-wrap:wrap;gap:.55rem;margin:1.25rem 0}.book-facts span{border:1px solid #33506d;border-radius:999px;padding:.4rem .75rem;font-size:.84rem;color:#d6e5f3}.price{font-size:1.5rem;font-weight:800;color:#fff;margin:1.2rem 0}.isbn{font-size:.85rem;color:#8f9aa5;margin-top:1rem}.book-extra{margin-top:4rem}.book-section-heading{max-width:760px;margin-bottom:1.5rem}.book-section-heading h2,.related-reading h2,.book-buy-panel h2{font-family:Montserrat,Inter,sans-serif;font-size:clamp(1.7rem,4vw,2.35rem);line-height:1.2}.book-section-heading p{margin-top:.55rem}.preview-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}.preview-grid article{padding:1.4rem;background:linear-gradient(145deg,#10243a,#151515);border:1px solid #294761;border-radius:14px}.preview-grid strong{font-size:1.08rem}.preview-grid p{font-size:.94rem;margin-top:.5rem}.book-testimonial{max-width:850px;margin:2.5rem auto;padding:1.7rem 1.8rem;border-left:4px solid var(--accent);background:var(--card);border-radius:0 14px 14px 0}.book-testimonial blockquote{font-size:1.08rem;line-height:1.75}.book-testimonial p{margin-top:.8rem;font-size:.88rem;color:#8fa3b5}.faq-list{display:grid;gap:.7rem;max-width:900px}.faq-list details{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:1rem 1.15rem}.faq-list summary{cursor:pointer;font-weight:750;color:#fff}.faq-list p{margin-top:.7rem}.related-reading{margin-top:3.5rem}.related-reading>a{display:flex;flex-direction:column;gap:.25rem;padding:1.1rem 0;border-bottom:1px solid var(--border);text-decoration:none}.related-reading>a span{color:#8fb9dc;font-size:.92rem}.book-buy-panel{margin-top:3.5rem;padding:clamp(1.5rem,5vw,2.5rem);text-align:center;background:linear-gradient(145deg,#0d2945,#111);border:1px solid #315777;border-radius:18px}.book-buy-panel p{margin:.75rem 0 1.25rem}
footer{padding:2.5rem 0;border-top:1px solid var(--border);text-align:center;color:#777;font-size:.85rem}footer a{color:#aaa}
@media(max-width:760px){.nav-links a:not(.store-btn){display:none}.quick-grid,.product-grid,.featured-book-grid,.book-page-grid,.preview-grid{grid-template-columns:1fr}.hero{padding:4rem 0 3rem}.hero-actions .btn{width:100%}.brand span{font-size:.86rem}.book-media{position:static}.featured-book img,.book-page-cover{max-width:250px;margin:auto;display:block}.book-device-image{max-width:360px;margin:1rem auto 0}.book-buy-panel .btn{width:100%}}