.spine-hero{background:#0a1326;padding:100px 24px 80px;text-align:center;position:relative;overflow:hidden}.spine-hero::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse at 20% 0,rgba(0,179,131,.2) 0,transparent 55%),radial-gradient(ellipse at 80% 0,rgba(56,132,255,.16) 0,transparent 55%);pointer-events:none}.spine-hero::after{content:'';position:absolute;bottom:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,rgba(0,179,131,.4) 50%,transparent)}.spine-hero__eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:var(--mint-2);margin-bottom:12px}.spine-hero__dot{width:6px;height:6px;background:#34d3a2;border-radius:50%;box-shadow:0 0 8px rgba(52,211,162,.7);flex-shrink:0;animation:eyebrow-pulse 2.4s ease-in-out infinite}@keyframes eyebrow-pulse{0%,100%{opacity:1;box-shadow:0 0 8px rgba(52,211,162,.7)}50%{opacity:.55;box-shadow:0 0 4px rgba(52,211,162,.3)}}.spine-hero__h1{font-family:'Bricolage Grotesque',sans-serif;font-size:clamp(1.8rem, 4vw, 2.8rem);font-weight:800;line-height:1.1;letter-spacing:-.03em;color:#e8ecf1;margin-bottom:12px}.spine-hero__sub{font-size:1rem;color:rgba(255,255,255,.6);max-width:500px;margin:0 auto;line-height:1.6}.spine-tool{background:var(--bg-page);padding:56px 24px 80px}.spine-tool__inner{max-width:620px;margin:0 auto}.spine-back{display:inline-flex;align-items:center;gap:6px;font-size:.8rem;font-weight:600;color:var(--muted);text-decoration:none;margin-bottom:16px;padding:7px 14px;background:var(--bg-card);border:1px solid var(--border);border-radius:8px;transition:border-color .15s,color .15s}.spine-back:hover{border-color:rgba(46,216,168,.45);color:var(--text)}.spine-card{background:var(--bg-card);border:1px solid var(--border);border-radius:16px;box-shadow:var(--sh-lg);padding:36px}.spine-form{display:flex;flex-direction:column;gap:20px}.spine-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}.spine-field{display:flex;flex-direction:column;gap:6px}.spine-label{font-size:.875rem;font-weight:600;color:var(--text)}.spine-input,.spine-select{height:48px;padding:0 14px;border:1.5px solid var(--border);border-radius:10px;background:var(--bg-page);color:var(--text);font-family:var(--fb);font-size:1rem;transition:border-color .15s;outline:0;appearance:none;-webkit-appearance:none}.spine-input:focus,.spine-select:focus{border-color:var(--mint)}.spine-input::placeholder{color:var(--placeholder)}.spine-select{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2394a3b8' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 14px center;padding-right:36px}.spine-hint{font-size:.75rem;color:var(--muted);line-height:1.4}.spine-btn{display:flex;align-items:center;justify-content:center;height:52px;background:linear-gradient(135deg,var(--mint) 0,var(--mint-2) 100%);color:#fff;border:none;border-radius:12px;font-family:var(--fb);font-size:1rem;font-weight:700;cursor:pointer;width:100%;margin-top:4px;transition:opacity .15s,transform .1s}.spine-btn:hover{opacity:.9}.spine-btn:active{transform:scale(.98)}.spine-results{margin-top:28px;padding-top:28px;border-top:1px solid var(--border-subtle)}.spine-diagram{background:var(--bg);border:1px solid var(--border-subtle);border-radius:14px;padding:28px 24px;margin-bottom:20px;text-align:center}.spine-diagram__label{font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.09em;color:var(--muted);margin-bottom:20px}.spine-diagram__book{display:flex;align-items:stretch;justify-content:center;margin:0 auto 16px;height:120px;max-width:320px}.spine-diagram__back{background:rgba(0,179,131,.12);border:2px solid rgba(0,179,131,.3);border-radius:4px 0 0 4px;flex:1;display:flex;align-items:center;justify-content:center}.spine-diagram__spine{background:linear-gradient(135deg,rgba(0,179,131,.25) 0,rgba(46,216,168,.35) 100%);border:2px solid rgba(0,179,131,.5);border-left:none;border-right:none;display:flex;align-items:center;justify-content:center;min-width:24px}.spine-diagram__front{background:rgba(56,132,255,.08);border:2px solid rgba(56,132,255,.2);border-radius:0 4px 4px 0;flex:1;display:flex;align-items:center;justify-content:center}.spine-diagram__part-label{font-size:.65rem;font-weight:600;color:var(--muted);writing-mode:horizontal-tb}.spine-diagram__spine .spine-diagram__part-label{writing-mode:vertical-rl;color:var(--mint-3)}.spine-diagram__dims{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.spine-diagram__dim-value{font-family:'Bricolage Grotesque',sans-serif;font-size:1.2rem;font-weight:800;color:var(--text);letter-spacing:-.02em;line-height:1;margin-bottom:3px}.spine-diagram__dim-label{font-size:.68rem;color:var(--muted);font-weight:600;text-transform:uppercase;letter-spacing:.06em}.spine-template{background:linear-gradient(135deg,rgba(0,179,131,.07) 0,rgba(46,216,168,.11) 100%);border:1px solid rgba(46,216,168,.25);border-radius:12px;padding:20px 22px;margin-bottom:16px}.spine-template__label{font-size:.68rem;font-weight:700;text-transform:uppercase;letter-spacing:.09em;color:var(--mint-3);margin-bottom:8px}.spine-template__value{font-family:'Bricolage Grotesque',sans-serif;font-size:1.3rem;font-weight:800;color:var(--text);letter-spacing:-.02em}.spine-template__note{font-size:.78rem;color:var(--muted);margin-top:4px;line-height:1.4}.spine-cta{display:flex;align-items:center;justify-content:space-between;gap:16px;background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:18px 20px}.spine-cta__text{font-size:.875rem;font-weight:600;color:var(--text);line-height:1.3}.spine-cta__sub{display:block;font-size:.78rem;color:var(--muted);margin-top:3px}.spine-cta__btn{display:inline-flex;align-items:center;gap:6px;padding:10px 18px;background:var(--mint);color:#fff;border-radius:8px;font-size:.85rem;font-weight:700;text-decoration:none;white-space:nowrap;flex-shrink:0;transition:background .15s}.spine-cta__btn:hover{background:var(--mint-3)}.spine-content{max-width:680px;margin:64px auto 0}.spine-content h2{font-family:'Bricolage Grotesque',sans-serif;font-size:1.25rem;font-weight:800;color:var(--text);margin:40px 0 10px}.spine-content h2:first-child{margin-top:0}.spine-content p{font-size:.925rem;color:var(--muted);line-height:1.75;margin-bottom:10px}.spine-faq{margin-top:40px}.spine-faq__item{border-top:1px solid var(--border-subtle);padding:18px 0}.spine-faq__item:last-child{border-bottom:1px solid var(--border-subtle)}.spine-faq__q{font-size:.9rem;font-weight:700;color:var(--text);margin-bottom:6px}.spine-faq__a{font-size:.875rem;color:var(--muted);line-height:1.65}.spine-final-cta{max-width:600px;margin:64px auto 0;padding:40px 32px;background:#0a1326;border-radius:20px;text-align:center}.spine-final-cta__eyebrow{font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:var(--mint-2);margin-bottom:12px}.spine-final-cta__h2{font-family:'Bricolage Grotesque',sans-serif;font-size:1.6rem;font-weight:800;color:#e8ecf1;margin-bottom:10px;line-height:1.15}.spine-final-cta__p{font-size:.875rem;color:rgba(255,255,255,.55);margin-bottom:24px;line-height:1.6;max-width:400px;margin-left:auto;margin-right:auto}.spine-final-cta__btn{display:inline-flex;align-items:center;gap:8px;padding:14px 28px;background:linear-gradient(135deg,var(--mint) 0,var(--mint-2) 100%);color:#fff;border-radius:12px;font-size:1rem;font-weight:700;text-decoration:none;transition:opacity .15s}.spine-final-cta__btn:hover{opacity:.88}@media (max-width:560px){.spine-card{padding:24px 20px}.spine-row{grid-template-columns:1fr}.spine-cta{flex-direction:column;align-items:flex-start}.spine-cta__btn{width:100%;justify-content:center}}