:root{--bg:#f5f7f6;--surface:#fff;--text:#17201c;--muted:#5d6963;--line:#dbe3df;--accent:#176b4d;--accent-dark:#0e4d37;--soft:#eaf4ef;--radius:18px;--shadow:0 12px 35px rgba(25,52,40,.08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.65}a{color:var(--accent-dark);text-decoration-thickness:1px;text-underline-offset:3px}a:hover{text-decoration-thickness:2px}.shell{width:min(1120px,calc(100% - 32px));margin-inline:auto}.skip-link{position:absolute;left:-9999px;top:8px;background:#fff;padding:10px;z-index:20}.skip-link:focus{left:8px}.site-header{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.94);border-bottom:1px solid var(--line);backdrop-filter:blur(10px)}.header-inner{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{font-weight:800;text-decoration:none;color:var(--text)}.header-inner nav,.site-footer nav{display:flex;gap:18px;flex-wrap:wrap}.header-inner nav a,.site-footer nav a{text-decoration:none}.page-shell{padding:28px 0 64px}.breadcrumbs{display:flex;gap:8px;flex-wrap:wrap;font-size:.9rem;color:var(--muted);margin-bottom:30px;text-transform:capitalize}.hero{max-width:none;margin-bottom:24px}.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-size:.78rem;font-weight:800;color:var(--accent);margin:0 0 8px}h1,h2,h3{line-height:1.2}h1{font-size:clamp(2rem,6vw,3.8rem);letter-spacing:-.04em;margin:.15em 0 .35em}.lede{font-size:clamp(1.05rem,2vw,1.25rem);color:var(--muted)}.calculator-card,.content-section,.methodology{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:clamp(20px,4vw,36px);margin:24px 0}.calculator-card{display:grid;gap:20px}.notice{background:#fff8e7;border:1px solid #f1d99a;border-radius:12px;padding:12px 14px}.field{display:grid;gap:7px;margin-bottom:16px}.field label{font-weight:700}.input-with-unit{display:flex;align-items:center;gap:8px}.field input,.field select{width:100%;min-height:48px;border:1px solid #aebbb5;border-radius:10px;padding:10px 12px;font:inherit;background:#fff;color:var(--text)}.field input:focus,.field select:focus{outline:3px solid rgba(23,107,77,.18);border-color:var(--accent)}.field-unit{white-space:nowrap;color:var(--muted);font-size:.9rem}.field-error,.form-error{min-height:1.2em;color:#a22626;font-size:.88rem}.calculator-card button,.button-link{display:inline-flex;justify-content:center;align-items:center;border:0;border-radius:10px;background:var(--accent);color:#fff;min-height:48px;padding:10px 20px;font:inherit;font-weight:800;cursor:pointer;text-decoration:none}.calculator-card button:hover,.button-link:hover{background:var(--accent-dark)}.results{border-top:1px solid var(--line);padding-top:20px}.result-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:12px}.result-item{background:var(--soft);border-radius:12px;padding:14px;display:grid;gap:4px}.result-item span,.result-item small{color:var(--muted)}.result-item strong{font-size:1.45rem}.formula-box{overflow:auto;background:#0e1713;color:#e8fff5;padding:18px;border-radius:12px}.formula-box code{white-space:normal}.faq details{border-top:1px solid var(--line);padding:16px 0}.faq details:last-child{border-bottom:1px solid var(--line)}.faq summary{font-weight:800;cursor:pointer}.related-grid,.tool-grid,.category-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}.related-card,.tool-card,.category-card{display:block;border:1px solid var(--line);border-radius:14px;background:#fff;padding:18px;text-decoration:none;color:var(--text)}.related-card:hover,.tool-card:hover,.category-card:hover{border-color:var(--accent);transform:translateY(-1px)}.related-card small{display:block;color:var(--accent);margin-top:6px}.ad-slot{min-height:110px;border:1px dashed #bcc7c2;border-radius:14px;display:flex;align-items:center;justify-content:center;color:#7a8580;background:#f0f3f1;margin:24px 0;font-size:.8rem;text-transform:uppercase;letter-spacing:.08em}.methodology{background:#f8faf9}.home-hero{padding:84px 0 54px;background:linear-gradient(180deg,#e6f4ee 0%,var(--bg) 100%)}.home-hero .shell{max-width:900px}.prose{max-width:840px}.site-footer{background:#101713;color:#d9e4df;padding:40px 0}.site-footer a{color:#fff}.footer-grid{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap}@media(min-width:760px){.calculator-card form{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 18px}.calculator-card form button,.calculator-card .form-error{grid-column:1/-1}.calculator-card form button{width:max-content;min-width:180px}}@media(max-width:560px){.header-inner{align-items:flex-start;padding:14px 0;flex-direction:column}.header-inner nav{gap:12px}.page-shell{padding-top:20px}.calculator-card,.content-section,.methodology{border-radius:14px;padding:20px}.result-grid{grid-template-columns:1fr}.ad-slot{min-height:90px}h1{font-size:2.2rem}}