:root{--tandem-green:#135740;--tandem-green-light:#1B6B4A;--tandem-green-hover:#0F4733;--tandem-green-soft:#e8f5ef;--golden-rod:#fca602;--golden-rod-soft:#fff8e6;--text-primary:#1a1a2e;--text-secondary:#4a4a5a;--text-muted:#6b7280;--bg-white:#ffffff;--bg-light:#f7f8fa;--bg-cream:#fdfcfa;--border-light:#e5e7eb;--font-heading:'Playfair Display', Georgia, serif;--font-body:'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;--container-width:1200px;--star-color:#f59e0b;--tandem-green-highlight:#7dd3a8;--tandem-amber:#f59e0b;--bg-hero:#F0F0F0;--shadow-sm:0 1px 4px rgba(19, 87, 64, 0.06);--shadow-md:0 2px 12px rgba(19, 87, 64, 0.08);--shadow-lg:0 4px 24px rgba(19, 87, 64, 0.12);--shadow-hover:0 6px 20px rgba(19, 87, 64, 0.15);--space-xs:4px;--space-sm:8px;--space-md:16px;--space-lg:24px;--space-xl:32px;--space-2xl:48px;--space-3xl:64px;--space-4xl:80px;--space-5xl:96px;--size-xs:0.60rem;--size-sm:0.81rem;--size-base:1.1rem;--size-md:1.49rem;--size-lg:2.03rem;--size-xl:2.75rem;--size-2xl:3.73rem}.book-page *,.book-page *::before,.book-page *::after{margin:0;padding:0;box-sizing:border-box}.book-page{font-family:var(--font-body);color:var(--text-primary);line-height:1.7;-webkit-font-smoothing:antialiased}.book-page img{max-width:100%;height:auto;display:block}.book-page a{text-decoration:none;color:inherit;transition:all 0.25s ease}.book-page .container{max-width:var(--container-width);margin:0 auto;padding:0 24px}.book-page .btn-primary{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--tandem-green);color:white!important;padding:15px 28px;border-radius:8px;font-family:var(--font-body);font-size:.9rem;font-weight:600;letter-spacing:.3px;border:none;cursor:pointer;box-shadow:0 2px 8px rgb(19 87 64 / .25);transition:all 0.25s ease}.book-page .btn-primary:hover{background:var(--tandem-green-hover);color:white!important;box-shadow:0 4px 16px rgb(19 87 64 / .35);transform:translateY(-1px)}.book-page .btn-secondary{display:inline-flex;align-items:center;justify-content:center;gap:6px;color:var(--tandem-green)!important;padding:15px 24px;border-radius:8px;font-family:var(--font-body);font-size:.9rem;font-weight:600;border:2px solid var(--tandem-green);cursor:pointer;background:#fff0;transition:all 0.25s ease}.book-page .btn-secondary:hover{background:var(--tandem-green-soft);color:var(--tandem-green)!important}.book-page .btn-amazon{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:#f90;color:#111!important;padding:14px 24px;border-radius:8px;font-family:var(--font-body);font-size:.9rem;font-weight:600;border:none;cursor:pointer;transition:all 0.25s ease}.book-page .btn-amazon:hover{background:#e68a00;color:#111!important;transform:translateY(-1px)}.book-page .btn-retailer{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--bg-light);color:var(--text-secondary)!important;padding:12px 20px;border-radius:8px;font-family:var(--font-body);font-size:.85rem;font-weight:500;border:1px solid var(--border-light);cursor:pointer;transition:all 0.25s ease}.book-page .btn-retailer:hover{background:var(--bg-white);border-color:var(--text-muted);color:var(--text-primary)!important}.book-page .section-label{display:inline-flex;align-items:center;gap:6px;font-size:.78rem;font-weight:600;letter-spacing:1.2px;text-transform:uppercase;color:var(--tandem-green);margin-bottom:16px}.book-page .stars{display:inline-flex;gap:2px;color:var(--star-color)}.book-page .stars svg{width:18px;height:18px;fill:currentColor}.book-page .badge{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;border-radius:6px;font-size:.8rem;font-weight:600;letter-spacing:.3px}.book-page .badge--gold{background:var(--golden-rod-soft);color:#92400e;border:1px solid rgb(252 166 2 / .3)}.book-page .badge--green{background:var(--tandem-green-soft);color:var(--tandem-green)}.book-page .verified{display:inline-flex;align-items:center;gap:4px;font-size:.75rem;font-weight:500;color:#047857}.book-page .verified svg{width:14px;height:14px}@media (max-width:640px){.book-page .btn-primary,.book-page .btn-secondary,.book-page .btn-amazon{width:100%;justify-content:center}}.book-page .hero-section{padding:64px 0 72px;background:linear-gradient(135deg,var(--bg-light) 0%,var(--bg-cream) 100%)}.book-page .hero-section .container{display:grid;grid-template-columns:320px 1fr;gap:56px;align-items:center}.book-page .hero-section__book{position:relative}.book-page .hero-section__badge{position:absolute;top:-12px;left:-12px;z-index:2}.book-page .hero-section__cover{border-radius:8px;box-shadow:0 20px 50px rgb(19 87 64 / .15),0 8px 20px rgb(19 87 64 / .1)}.book-page .hero-section__content{max-width:600px}.book-page .hero-section__rating{display:flex;align-items:center;gap:12px;margin-bottom:20px}.book-page .hero-section__rating-text{font-size:.85rem;color:var(--text-muted)}.book-page .hero-section h1{font-family:var(--font-heading);font-size:2.75rem;font-weight:700;line-height:1.15;color:var(--text-primary);margin:0 0 12px}.book-page .hero-section__subtitle{font-family:var(--font-heading);font-size:1.35rem;font-weight:500;line-height:1.4;color:var(--text-secondary);margin:0 0 20px;font-style:italic}.book-page .hero-section__authors{font-size:1rem;color:var(--text-secondary);margin-bottom:28px}.book-page .hero-section__authors strong{color:var(--text-primary);font-weight:600}.book-page .hero-section__ctas{display:flex;gap:16px;flex-wrap:wrap}@media (max-width:1024px){.book-page .hero-section .container{grid-template-columns:280px 1fr;gap:40px}.book-page .hero-section h1{font-size:2.03rem}}@media (max-width:768px){.book-page .hero-section{padding:48px 0 56px}.book-page .hero-section .container{grid-template-columns:1fr;gap:32px;text-align:center}.book-page .hero-section__book{max-width:260px;margin:0 auto}.book-page .hero-section__badge{left:50%;transform:translateX(-50%)}.book-page .hero-section__content{max-width:100%}.book-page .hero-section__rating{justify-content:center}.book-page .hero-section h1{font-size:2rem}.book-page .hero-section__subtitle{font-size:1.15rem}.book-page .hero-section__ctas{flex-direction:column}}.book-page .value-section{padding:72px 0;background:var(--bg-white)}.book-page .value-section .container{max-width:800px}.book-page .value-section__hook{font-family:var(--font-heading);font-size:1.75rem;font-weight:600;line-height:1.35;color:var(--text-primary);margin:0 0 32px;padding-bottom:32px;border-bottom:1px solid var(--border-light)}.book-page .value-section__content p{font-size:1.1rem;line-height:1.8;color:var(--text-secondary);margin:0 0 20px}.book-page .value-section__content p:last-child{margin-bottom:0}.book-page .value-section__content strong{color:var(--text-primary);font-weight:600}@media (max-width:768px){.book-page .value-section{padding:56px 0}.book-page .value-section__hook{font-size:1.5rem}.book-page .value-section__content p{font-size:1rem}}.book-page .preview-section{padding:64px 0;background:var(--bg-light)}.book-page .preview-section .container{max-width:1000px}.book-page .preview-section__header{text-align:center;margin-bottom:32px}.book-page .preview-section h2{font-family:var(--font-heading);font-size:2rem;font-weight:700;color:var(--text-primary);margin:0 0 8px}.book-page .preview-section__caption{font-size:.95rem;color:var(--text-muted)}.book-page .preview-section__embed{position:relative;width:100%;padding-bottom:75%;background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 20px rgb(19 87 64 / .08)}.book-page .preview-section__embed iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:none}@media (max-width:768px){.book-page .preview-section{padding:48px 0}.book-page .preview-section h2{font-size:1.65rem}.book-page .preview-section__embed{padding-bottom:100%;border-radius:8px}}.book-page .learn-section{padding:80px 0;background:var(--bg-white)}.book-page .learn-section .container{max-width:1100px}.book-page .learn-section__header{text-align:center;margin-bottom:48px}.book-page .learn-section h2{font-family:var(--font-heading);font-size:2rem;font-weight:700;color:var(--text-primary);margin:8px 0 0}.book-page .learn-section__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}.book-page .learn-section__item{padding:28px;background:var(--bg-light);border-radius:12px;border:1px solid var(--border-light);transition:all 0.25s ease}.book-page .learn-section__item:hover{border-color:var(--tandem-green);box-shadow:0 4px 16px rgb(19 87 64 / .08)}.book-page .learn-section__icon{width:48px;height:48px;background:var(--tandem-green-soft);border-radius:10px;display:flex;align-items:center;justify-content:center;margin-bottom:16px;color:var(--tandem-green)}.book-page .learn-section__icon svg{width:24px;height:24px}.book-page .learn-section__item h3{font-family:var(--font-body);font-size:1.1rem;font-weight:600;color:var(--text-primary);margin:0 0 8px}.book-page .learn-section__item p{font-size:.95rem;line-height:1.6;color:var(--text-secondary);margin:0}@media (max-width:1024px){.book-page .learn-section__grid{grid-template-columns:repeat(2,1fr);gap:24px}}@media (max-width:640px){.book-page .learn-section{padding:56px 0}.book-page .learn-section__grid{grid-template-columns:1fr;gap:20px}.book-page .learn-section__item{padding:24px}.book-page .learn-section 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0;background:var(--bg-light)}.book-page .reviews-section .container{max-width:1100px}.book-page .reviews-section__header{text-align:center;margin-bottom:48px}.book-page .reviews-section h2{font-family:var(--font-heading);font-size:2rem;font-weight:700;color:var(--text-primary);margin:8px 0 8px}.book-page .reviews-section__subtitle{font-size:.95rem;color:var(--text-muted)}.book-page .reviews-section__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:32px}.book-page .reviews-section__card{background:var(--bg-white);border-radius:12px;padding:28px;border:1px solid var(--border-light);display:flex;flex-direction:column}.book-page .reviews-section__card-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:16px}.book-page .reviews-section__reviewer{font-weight:600;color:var(--text-primary);font-size:.95rem}.book-page .reviews-section__date{font-size:.8rem;color:var(--text-muted)}.book-page .reviews-section__headline{font-family:var(--font-body);font-size:1rem;font-weight:600;color:var(--text-primary);margin:0 0 12px;line-height:1.4}.book-page .reviews-section__quote{font-size:.95rem;line-height:1.7;color:var(--text-secondary);margin:0 0 16px;flex-grow:1}.book-page .reviews-section__footer{display:flex;align-items:center;justify-content:space-between;padding-top:16px;border-top:1px solid var(--border-light)}.book-page .reviews-section__helpful{font-size:.8rem;color:var(--text-muted)}.book-page .reviews-section__link{text-align:center}.book-page .reviews-section__link a{display:inline-flex;align-items:center;gap:6px;color:var(--tandem-green);font-weight:600;font-size:.95rem}.book-page .reviews-section__link a:hover{text-decoration:underline}.book-page .reviews-section__link svg{width:18px;height:18px}@media (max-width:1024px){.book-page .reviews-section__grid{grid-template-columns:1fr;gap:20px}}@media (max-width:640px){.book-page .reviews-section{padding:56px 0}.book-page .reviews-section h2{font-size:1.65rem}.book-page .reviews-section__card{padding:24px}}.book-page .contents-section{padding:80px 0;background:var(--bg-white)}.book-page .contents-section .container{max-width:900px}.book-page .contents-section__header{text-align:center;margin-bottom:48px}.book-page .contents-section h2{font-family:var(--font-heading);font-size:2rem;font-weight:700;color:var(--text-primary);margin:8px 0 8px}.book-page .contents-section__subtitle{font-size:.95rem;color:var(--text-muted)}.book-page .contents-section__parts{display:flex;flex-direction:column;gap:16px}.book-page .contents-section__part{background:var(--bg-light);border-radius:12px;border:1px solid var(--border-light);overflow:hidden}.book-page .contents-section__part-header{display:flex;align-items:center;justify-content:space-between;padding:20px 24px;cursor:pointer;transition:background 0.2s ease}.book-page .contents-section__part-header:hover{background:rgb(0 0 0 / .02)}.book-page .contents-section__part-title{display:flex;align-items:center;gap:12px}.book-page .contents-section__part-number{width:32px;height:32px;background:var(--tandem-green);color:#fff;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:.85rem;font-weight:700}.book-page .contents-section__part-name{font-family:var(--font-body);font-size:1.1rem;font-weight:600;color:var(--text-primary)}.book-page .contents-section__part-toggle{width:24px;height:24px;color:var(--text-muted);transition:transform 0.3s ease}.book-page .contents-section__part[open] .contents-section__part-toggle{transform:rotate(180deg)}.book-page .contents-section__part-chapters{padding:0 24px 24px;border-top:1px solid var(--border-light)}.book-page .contents-section__chapter-list{display:flex;flex-wrap:wrap;gap:8px 16px;padding-top:20px;list-style:none}.book-page .contents-section__chapter-list li{display:flex;align-items:center;gap:8px;font-size:.9rem;color:var(--text-secondary)}.book-page .contents-section__chapter-list li::before{content:'';width:6px;height:6px;background:var(--tandem-green);border-radius:50%;flex-shrink:0}.book-page .contents-section__chapter-list a{color:var(--tandem-green);font-weight:500}.book-page .contents-section__chapter-list a:hover{text-decoration:underline}@media (max-width:640px){.book-page .contents-section{padding:56px 0}.book-page .contents-section h2{font-size:1.65rem}.book-page .contents-section__part-header{padding:16px 20px}.book-page .contents-section__part-name{font-size:1rem}.book-page .contents-section__part-chapters{padding:0 20px 20px}.book-page .contents-section__chapter-list{flex-direction:column;gap:10px}}.book-page .authors-section{padding:80px 0;background:var(--bg-light)}.book-page .authors-section .container{max-width:1100px}.book-page .authors-section__header{text-align:center;margin-bottom:48px}.book-page .authors-section h2{font-family:var(--font-heading);font-size:2rem;font-weight:700;color:var(--text-primary);margin:8px 0 0}.book-page .authors-section__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}.book-page .authors-section__card{background:var(--bg-white);border-radius:16px;padding:32px 28px;text-align:center;border:1px solid var(--border-light)}.book-page .authors-section__photo{width:120px;height:120px;border-radius:50%;object-fit:cover;margin:0 auto 20px;border:4px solid var(--bg-light)}.book-page .authors-section__name{font-family:var(--font-heading);font-size:1.35rem;font-weight:700;color:var(--text-primary);margin:0 0 4px}.book-page .authors-section__credentials{font-size:.85rem;font-weight:600;color:var(--tandem-green);margin-bottom:16px}.book-page .authors-section__bio{font-size:.9rem;line-height:1.65;color:var(--text-secondary);margin-bottom:20px}.book-page .authors-section__link{display:inline-flex;align-items:center;gap:6px;color:var(--tandem-green);font-size:.9rem;font-weight:600}.book-page .authors-section__link:hover{text-decoration:underline}.book-page .authors-section__link svg{width:16px;height:16px}.book-page .authors-section__note{max-width:700px;margin:48px auto 0;padding:20px 24px;background:var(--bg-white);border-radius:10px;border:1px solid var(--border-light);text-align:center}.book-page .authors-section__note p{font-size:.9rem;color:var(--text-muted);margin:0;line-height:1.6}.book-page .authors-section__note strong{color:var(--text-secondary)}@media (max-width:1024px){.book-page .authors-section__grid{grid-template-columns:repeat(3,1fr);gap:20px}.book-page .authors-section__card{padding:24px 20px}}@media (max-width:768px){.book-page .authors-section{padding:56px 0}.book-page .authors-section__grid{grid-template-columns:1fr;gap:24px;max-width:400px;margin:0 auto}.book-page .authors-section h2{font-size:1.65rem}}.book-page .cta-section{padding:72px 0;background:linear-gradient(135deg,var(--tandem-green) 0%,#0d4530 100%)}.book-page .cta-section .container{max-width:800px;text-align:center}.book-page .cta-section h2{font-family:var(--font-heading);font-size:2rem;font-weight:700;color:#fff;margin:0 0 16px}.book-page .cta-section__body{font-size:1.1rem;line-height:1.7;color:rgb(255 255 255 / .9);margin:0 0 32px}.book-page .cta-section__buttons{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}.book-page .cta-section .btn-white{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:#fff;color:var(--tandem-green)!important;padding:15px 28px;border-radius:8px;font-family:var(--font-body);font-size:.9rem;font-weight:600;border:none;cursor:pointer;transition:all 0.25s ease}.book-page .cta-section .btn-white:hover{background:var(--bg-light);transform:translateY(-1px);box-shadow:0 4px 16px rgb(19 87 64 / .15)}.book-page .cta-section .btn-outline{display:inline-flex;align-items:center;justify-content:center;gap:6px;color:#fff!important;padding:15px 24px;border-radius:8px;font-family:var(--font-body);font-size:.9rem;font-weight:600;border:2px solid rgb(255 255 255 / .4);background:#fff0;cursor:pointer;transition:all 0.25s ease}.book-page .cta-section .btn-outline:hover{border-color:#fff;background:rgb(255 255 255 / .1)}@media (max-width:640px){.book-page .cta-section{padding:56px 0}.book-page .cta-section h2{font-size:1.65rem}.book-page .cta-section__body{font-size:1rem}.book-page .cta-section__buttons{flex-direction:column}.book-page .cta-section .btn-white,.book-page .cta-section .btn-outline{width:100%}}.book-page .buy-section{padding:64px 0;background:var(--bg-white)}.book-page .buy-section .container{max-width:800px;text-align:center}.book-page .buy-section h2{font-family:var(--font-heading);font-size:1.75rem;font-weight:700;color:var(--text-primary);margin:0 0 8px}.book-page .buy-section__formats{font-size:.9rem;color:var(--text-muted);margin-bottom:32px}.book-page .buy-section__buttons{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}@media (max-width:640px){.book-page .buy-section{padding:48px 0}.book-page .buy-section h2{font-size:1.5rem}.book-page .buy-section__buttons{display:grid;grid-template-columns:1fr 1fr;gap:12px}.book-page .buy-section__buttons .btn-amazon{grid-column:1 / -1}}.book-page .section-header{text-align:center;max-width:720px;margin:0 auto 56px}