:root{--bg-black: #050608;--text-white: #ffffff;--text-dim: #e2e8f0;--text-muted: #94a3b8;--accent-cyan: #19aec9;--accent-cyan-bright: #26c6e3;--accent-cyan-glow: rgba(25, 174, 201, .25);--border-hairline: rgba(255, 255, 255, .12);--border-hover: rgba(25, 174, 201, .5);--font-sans: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;--font-heading: "Plus Jakarta Sans", "Inter", sans-serif;--font-mono: "Space Grotesk", monospace}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{width:100%;max-width:100%;overflow-x:hidden!important;scroll-behavior:smooth;background-color:var(--bg-black);color:var(--text-white);font-family:var(--font-sans);-webkit-font-smoothing:antialiased}body{min-height:100vh;position:relative}.content-wrapper{width:100%;max-width:100%;position:relative;z-index:2;overflow-x:hidden!important}.container{width:100%;max-width:1180px;margin:0 auto;padding:0 24px;box-sizing:border-box}.text-center{text-align:center}.section{padding:clamp(36px,5vw,68px) 0;width:100%;box-sizing:border-box}.section-divider-line{width:100%;height:1px;background:linear-gradient(90deg,#ffffff05,#19aec959,#ffffff05);margin:0 auto}.navbar{position:fixed;top:0;left:0;width:100%;max-width:100%;z-index:100;padding:14px 0;transition:background .3s,padding .3s}.navbar.scrolled{padding:10px 0;background:#050608f2;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid var(--border-hairline)}.nav-container{width:100%;max-width:1180px;margin:0 auto;padding:0 24px;display:flex;justify-content:space-between;align-items:center;gap:12px;box-sizing:border-box}.nav-logo{font-family:var(--font-heading);font-weight:800;font-size:1rem;letter-spacing:.15em;color:var(--text-white);text-decoration:none;flex-shrink:0}.currency-toggle-pill{display:inline-flex;align-items:center;padding:3px;background:#ffffff0d;border:1px solid var(--border-hairline);border-radius:999px;gap:2px;flex-shrink:0}.btn-curr{border:none;background:transparent;color:var(--text-muted);font-family:var(--font-sans);font-size:.78rem;font-weight:700;padding:5px 12px;border-radius:999px;cursor:pointer;transition:all .2s ease}.btn-curr:hover{color:var(--text-white)}.btn-curr.active{background:var(--accent-cyan);color:#fff;box-shadow:0 4px 12px var(--accent-cyan-glow)}.nav-actions{display:flex;gap:8px;align-items:center;flex-shrink:0}.btn-amazon-nav{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border-radius:999px;text-decoration:none;font-weight:700;font-size:.8rem;transition:all .2s ease;white-space:nowrap}.btn-amazon-nav.uk{background:var(--accent-cyan);color:#fff;border:1px solid var(--accent-cyan);box-shadow:0 4px 14px var(--accent-cyan-glow)}.btn-amazon-nav.uk:hover{background:var(--accent-cyan-bright);border-color:var(--accent-cyan-bright);transform:translateY(-1px)}.btn-amazon-nav.us{background:#ffffff14;border:1px solid var(--border-hairline);color:var(--text-white)}.btn-amazon-nav.us:hover{border-color:var(--accent-cyan);color:var(--accent-cyan);background:#19aec91a}.hero-section{min-height:70vh;display:flex;align-items:center;padding-top:clamp(56px,6vw,76px);padding-bottom:clamp(20px,3vw,36px);width:100%;max-width:100%;box-sizing:border-box;overflow:hidden}.hero-container{width:100%}.hero-grid{display:grid;grid-template-columns:1.35fr .65fr;gap:clamp(20px,3vw,44px);align-items:center;width:100%}.hero-text-block{width:100%;max-width:720px}.hero-kicker{font-family:var(--font-mono);font-size:clamp(.68rem,1.4vw,.8rem);letter-spacing:.12em;color:var(--accent-cyan);display:block;margin-bottom:12px;line-height:1.4;word-break:break-word}.hero-headline{font-family:var(--font-heading);font-size:clamp(1.5rem,2.85vw,2.75rem);font-weight:800;line-height:1.18;letter-spacing:-.025em;margin-bottom:18px;word-break:normal}.hero-headline .hero-line{display:block;white-space:nowrap}.hero-headline .highlight{color:var(--text-white);display:inline}.hero-headline .highlight-cyan{color:var(--accent-cyan);display:inline}.hero-subtext{font-size:clamp(.92rem,1.6vw,1.1rem);line-height:1.6;color:var(--text-dim);margin-bottom:24px;font-weight:400}.hero-action-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap;width:100%}.btn-primary-minimal{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 24px;background:var(--accent-cyan);color:#fff;font-weight:700;font-size:.9rem;border-radius:999px;text-decoration:none;transition:all .25s ease;min-height:48px;text-align:center}.btn-primary-minimal:hover{background:var(--accent-cyan-bright);transform:translateY(-2px);box-shadow:0 10px 30px var(--accent-cyan-glow)}.btn-outline-minimal{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 24px;background:transparent;border:1px solid var(--border-hairline);color:var(--text-white);font-weight:600;font-size:.9rem;border-radius:999px;text-decoration:none;transition:all .25s ease;min-height:48px;text-align:center}.btn-outline-minimal:hover{border-color:var(--accent-cyan);color:var(--accent-cyan);background:#19aec914}.btn-link-minimal{color:var(--text-dim);text-decoration:none;font-size:.9rem;font-weight:500;display:inline-flex;align-items:center;gap:6px;transition:color .2s;min-height:48px}.btn-link-minimal:hover{color:var(--accent-cyan)}.hero-book-column{display:flex;flex-direction:column;align-items:center;justify-content:center;position:relative;width:100%;max-width:100%;overflow:hidden}.book-3d-wrapper{width:100%;max-width:100%;height:clamp(240px,36vw,420px);cursor:grab;position:relative;overflow:hidden}.book-3d-wrapper canvas{width:100%!important;height:100%!important;max-width:100%!important;display:block}.book-3d-wrapper:active{cursor:grabbing}.section-num{font-family:var(--font-mono);font-size:.78rem;letter-spacing:.18em;color:var(--accent-cyan);font-weight:700;display:block;margin-bottom:10px}.minimal-title{font-family:var(--font-heading);font-size:clamp(1.5rem,3.2vw,2.7rem);font-weight:800;letter-spacing:-.02em;margin-bottom:18px;word-break:normal;overflow-wrap:break-word}.minimal-body{font-size:clamp(.92rem,1.6vw,1.08rem);line-height:1.65;color:var(--text-dim);max-width:600px;margin-bottom:28px}.minimal-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(24px,4vw,48px);align-items:center;width:100%}.math-image-col{width:100%}.math-image-wrapper{position:relative;border-radius:20px;overflow:hidden;border:1px solid var(--border-hairline);background:#ffffff05;box-shadow:0 16px 40px #00000073;transition:border-color .3s;width:100%}.math-image-wrapper:hover{border-color:var(--accent-cyan)}.math-img{width:100%;height:auto;display:block;object-fit:cover}.formula-preview{padding:20px 0;border-top:1px solid var(--border-hairline);border-bottom:1px solid var(--border-hairline);display:flex;flex-direction:column;gap:10px;max-width:440px;width:100%}.formula-row{display:flex;justify-content:space-between;font-size:.92rem;color:var(--text-dim)}.formula-row .val{font-weight:600;color:var(--text-white)}.formula-row .val.cyan{color:var(--accent-cyan);font-size:1.05rem}.calc-wrapper{max-width:720px;margin:0 auto;width:100%}.minimal-calc-box{margin-top:24px;padding:clamp(18px,3.5vw,36px);background:#ffffff05;border:1px solid var(--border-hairline);border-radius:20px;width:100%;box-sizing:border-box}.calc-row-clean{margin-bottom:24px}.calc-label-clean{display:flex;justify-content:space-between;font-size:.88rem;color:var(--text-dim);margin-bottom:10px}.calc-num-clean{font-family:var(--font-mono);font-weight:700;color:var(--accent-cyan);font-size:1.05rem}.slider-minimal{width:100%;height:6px;background:#ffffff1f;outline:none;-webkit-appearance:none;border-radius:3px}.slider-minimal::-webkit-slider-thumb{-webkit-appearance:none;width:22px;height:22px;border-radius:50%;background:var(--accent-cyan);cursor:pointer;transition:transform .15s}.slider-minimal::-webkit-slider-thumb:hover{transform:scale(1.2);box-shadow:0 0 15px var(--accent-cyan)}.calc-output-big{margin-top:32px;padding-top:24px;border-top:1px solid var(--border-hairline);text-align:center}.out-label{font-size:.8rem;letter-spacing:.12em;color:var(--accent-cyan);font-weight:700;text-transform:uppercase;margin-bottom:6px}.out-number{font-family:var(--font-heading);font-size:clamp(2rem,4.8vw,3.8rem);font-weight:900;color:var(--accent-cyan);line-height:1;margin-bottom:6px}.out-sub{font-size:.9rem;color:var(--text-dim);margin-bottom:6px}.out-note{font-size:.78rem;color:var(--text-muted)}.video-wrapper-inner{max-width:920px;margin:0 auto;width:100%}.video-headline{max-width:900px;margin-left:auto;margin-right:auto;font-size:clamp(1.4rem,3vw,2.35rem);line-height:1.25}.highlight-underline{color:var(--accent-cyan);font-weight:800;white-space:nowrap;border-bottom:3px solid var(--accent-cyan);padding-bottom:2px;display:inline-block}.video-embed-box{position:relative;width:100%;padding-bottom:56.25%;height:0;border-radius:20px;overflow:hidden;border:1px solid var(--border-hairline);background:#ffffff05;box-shadow:0 20px 50px #0000008c;transition:border-color .3s}.video-embed-box:hover{border-color:var(--accent-cyan)}.youtube-iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:none}.author-grid{display:grid;grid-template-columns:.4fr .6fr;gap:clamp(24px,4vw,48px);align-items:flex-start;width:100%}.author-photo-col{position:sticky;top:90px;width:100%}.author-image-wrapper{position:relative;border-radius:20px;overflow:hidden;border:1px solid var(--border-hairline);background:#ffffff05;box-shadow:0 16px 40px #00000073;transition:border-color .3s;width:100%}.author-image-wrapper:hover{border-color:var(--accent-cyan)}.author-img{width:100%;height:auto;display:block;object-fit:cover}.author-badge{position:absolute;bottom:14px;left:14px;padding:6px 14px;background:#050608d9;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--border-hairline);border-radius:999px;font-family:var(--font-mono);font-size:.75rem;color:var(--accent-cyan);letter-spacing:.08em}.author-social-link{margin-top:14px;display:flex;justify-content:center;width:100%}.btn-linkedin-author{display:inline-flex;align-items:center;justify-content:center;gap:8px;width:100%;padding:11px 20px;background:#ffffff0a;border:1px solid var(--border-hairline);color:var(--text-white);font-weight:600;font-size:.85rem;border-radius:999px;text-decoration:none;transition:all .25s ease;min-height:44px}.btn-linkedin-author:hover{background:#19aec91a;border-color:var(--accent-cyan);color:var(--accent-cyan);transform:translateY(-2px)}.author-quote{font-family:var(--font-heading);font-size:clamp(1.05rem,2vw,1.65rem);font-weight:700;line-height:1.38;color:var(--text-white);margin-bottom:24px;padding-left:16px;border-left:3px solid var(--accent-cyan)}.author-story-body{font-size:clamp(.9rem,1.5vw,1.05rem);line-height:1.75;color:var(--text-dim);display:flex;flex-direction:column;gap:16px;margin-bottom:32px}.author-story-body strong{color:var(--text-white)}.author-milestone-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:16px;padding-top:24px;border-top:1px solid var(--border-hairline);width:100%}.am-item{display:flex;flex-direction:column}.am-stat{font-family:var(--font-heading);font-size:clamp(1.5rem,2.8vw,2.2rem);font-weight:900;color:var(--accent-cyan);line-height:1}.am-label{font-size:.78rem;color:var(--text-muted);margin-top:4px;line-height:1.35}.acc-wrapper{width:100%}.acc-cards-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:44px;width:100%}.acc-card{background:#ffffff05;border:1px solid var(--border-hairline);border-radius:20px;padding:clamp(20px,2.5vw,32px) clamp(18px,2vw,28px);display:flex;flex-direction:column;transition:transform .3s ease,border-color .3s ease,box-shadow .3s ease;width:100%;box-sizing:border-box}.acc-card:hover{transform:translateY(-4px);border-color:var(--accent-cyan);box-shadow:0 16px 40px #19aec91f;background:#19aec908}.acc-card-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.acc-icon-box{width:44px;height:44px;border-radius:12px;background:#19aec91a;border:1px solid rgba(25,174,201,.25);display:flex;align-items:center;justify-content:center}.acc-card-num{font-family:var(--font-mono);font-size:.9rem;font-weight:800;color:var(--accent-cyan);padding:4px 10px;background:#ffffff0d;border-radius:999px;border:1px solid var(--border-hairline)}.acc-card-title{font-family:var(--font-heading);font-size:clamp(1.1rem,1.8vw,1.28rem);font-weight:700;color:var(--text-white);margin-bottom:12px;line-height:1.3}.acc-card-body{font-size:clamp(.86rem,1.3vw,.94rem);line-height:1.65;color:var(--text-dim);flex-grow:1}.acc-cta-center{display:flex;justify-content:center;width:100%}.buy-section{padding:clamp(40px,7vw,80px) 0;border-top:1px solid var(--border-hairline)}.buy-headline{font-family:var(--font-heading);font-size:clamp(1.7rem,4vw,3.6rem);font-weight:900;margin-bottom:12px;word-break:normal;overflow-wrap:break-word}.buy-sub{font-size:clamp(.92rem,1.8vw,1.1rem);color:var(--text-dim);margin-bottom:32px}.buy-cta-wrap{display:flex;justify-content:center;gap:16px;flex-wrap:wrap}.btn-xl{padding:16px 36px;font-size:1.02rem}.footer-minimal{padding:32px 0;border-top:1px solid var(--border-hairline);font-size:.85rem;color:var(--text-muted)}.footer-flex{display:flex;justify-content:space-between;align-items:flex-start;gap:24px}.footer-brand-wrap{display:flex;flex-direction:column;gap:6px;max-width:520px}.f-disclaimer{font-size:.78rem;color:var(--text-muted);line-height:1.4}.f-links{display:flex;gap:24px;flex-wrap:wrap}.f-links a{color:var(--text-dim);text-decoration:none;transition:color .2s}.f-links a:hover{color:var(--accent-cyan)}@media (max-width: 768px){.nav-actions{display:none!important}}@media (max-width: 899px){.hero-section{padding-top:80px}.hero-grid{grid-template-columns:1fr;gap:24px}.hero-text-block{text-align:center;margin:0 auto;max-width:100%}.hero-kicker{text-align:center;margin-left:auto;margin-right:auto}.hero-headline{text-align:center;font-size:clamp(1.85rem,6.5vw,2.7rem)!important;line-height:1.16}.hero-headline .hero-line{display:inline!important;white-space:normal!important}.hero-subtext{text-align:center;margin-left:auto;margin-right:auto;font-size:clamp(.98rem,2.2vw,1.12rem)}.hero-action-row{justify-content:center}.hero-book-column{order:2}.book-3d-wrapper{height:320px}.math-image-col{display:none!important}.minimal-grid,.author-grid{grid-template-columns:1fr;gap:28px}.author-photo-col{position:relative;top:0;max-width:320px;margin:0 auto}.acc-cards-grid{grid-template-columns:1fr;gap:18px}.footer-flex{flex-direction:column;gap:20px;text-align:left}.desktop-only-br{display:none}}@media (max-width: 599px){.container{padding:0 16px}.nav-container{padding:0 16px;gap:8px}.btn-curr{padding:4px 9px;font-size:.72rem}.hero-headline{font-size:clamp(1.8rem,7vw,2.5rem)!important;line-height:1.18;margin-bottom:16px;text-align:center}.hero-headline .hero-line{display:inline!important;white-space:normal!important}.hero-action-row{flex-direction:column;align-items:stretch;gap:10px}.btn-primary-minimal,.btn-outline-minimal{width:100%}.book-3d-wrapper{height:280px}.minimal-calc-box{padding:18px 12px}.author-milestone-grid{grid-template-columns:1fr 1fr;gap:14px}.acc-card{padding:22px 18px}.buy-cta-wrap{flex-direction:column;gap:10px}.btn-xl{width:100%}}@media (max-width: 399px){.container{padding:0 10px}.nav-container{padding:0 8px}.hero-headline{font-size:1.65rem!important;line-height:1.2;text-align:center}.book-3d-wrapper{height:230px}.author-milestone-grid{grid-template-columns:1fr}}