:root{--ink:#142523;--muted:#60706d;--brand:#0a655d;--brand-dark:#074d47;--aqua:#dff3ef;--line:#dce6e3;--surface:#fff;--bg:#f7faf9;--warm:#f3f0e9;--shadow:0 16px 50px rgba(20,37,35,.08);--radius:18px;--max:1120px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.6}a{color:inherit}button,input,select{font:inherit}.container{width:min(calc(100% - 32px),var(--max));margin-inline:auto}.skip-link{position:fixed;z-index:99;left:16px;top:12px;transform:translateY(-150%);background:var(--ink);color:#fff;padding:10px 14px;border-radius:8px}.skip-link:focus{transform:none}.site-header{height:68px;background:rgba(247,250,249,.94);border-bottom:1px solid var(--line)}.header-inner{height:100%;display:flex;align-items:center;justify-content:space-between}.brand{display:inline-flex;align-items:center;gap:8px;text-decoration:none;font-size:1.18rem;font-weight:800;letter-spacing:-.03em}.brand-mark{display:grid;place-items:center;width:29px;height:29px;border-radius:9px;background:var(--brand);color:#fff;font-size:1.35rem;line-height:1}.site-header nav,.site-footer nav{display:flex;gap:22px}.site-header nav a,.site-footer nav a{color:var(--muted);font-size:.92rem;text-decoration:none}.site-header nav a:hover,.site-footer nav a:hover{color:var(--brand)}.hero{padding:72px 0 64px;background:radial-gradient(circle at 80% 30%,rgba(169,224,214,.25),transparent 32%),var(--bg)}.hero-inner{max-width:760px;text-align:center}.eyebrow{margin:0 0 8px;color:var(--brand);font-size:.75rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase}.hero h1{margin:0;font-size:clamp(2.5rem,7vw,4.8rem);line-height:1.02;letter-spacing:-.06em}.hero-copy{margin:20px 0 30px;color:var(--muted);font-size:1.15rem}.tool-search{max-width:620px;margin:auto;text-align:left}.tool-search label{display:block;margin-bottom:7px;font-size:.85rem;font-weight:700}.search-field{position:relative}.search-field svg{position:absolute;left:16px;top:50%;width:21px;fill:none;stroke:var(--muted);stroke-width:2;transform:translateY(-50%)}.search-field input{width:100%;height:58px;padding:0 16px 0 48px;border:1px solid var(--line);border-radius:14px;background:#fff;box-shadow:0 10px 35px rgba(20,37,35,.06);color:var(--ink)}input:focus,select:focus,button:focus-visible,a:focus-visible{outline:3px solid rgba(10,101,93,.28);outline-offset:2px;border-color:var(--brand)}.search-status{min-height:24px;margin:5px 0 0;color:var(--muted);font-size:.82rem}.section{padding:72px 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span{color:var(--muted)}.card-arrow{margin-left:auto;color:var(--brand);font-size:1.5rem}.coming-block{margin-top:64px}.tool-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.muted-card{min-height:94px;padding:17px;color:#42514f}.small-icon{display:grid;place-items:center;flex:0 0 34px;height:34px;border-radius:10px;background:#edf2f0;color:var(--brand)}.badge{margin-left:auto;color:#7b8582;font-size:.7rem;text-transform:uppercase;letter-spacing:.06em}.about-section{padding:68px 0;background:var(--ink);color:#fff}.about-inner{max-width:700px}.about-section .eyebrow{color:#7fcbc0}.about-section h2{font-size:clamp(2rem,5vw,3.2rem)}.about-section p:last-child{color:#c4cfcd;font-size:1.08rem}.site-footer{padding:42px 0;background:#0c1c1a;color:#fff}.footer-inner{display:grid;grid-template-columns:1fr auto;gap:20px;align-items:start}.footer-brand{color:#fff}.footer-inner p{margin:8px 0;color:#9dacab;font-size:.85rem}.copyright{grid-column:1/-1;border-top:1px solid #263633;padding-top:20px}.breadcrumb{padding:22px 0 8px;color:var(--muted);font-size:.84rem}.breadcrumb ol{display:flex;gap:9px;margin:0;padding:0;list-style:none}.breadcrumb li+li:before{content:'/';margin-right:9px;color:#a3afad}.breadcrumb a{color:var(--brand)}.tool-intro{padding:24px 0 28px}.tool-intro h1{max-width:800px;margin:0;font-size:clamp(2.25rem,6vw,4.25rem);line-height:1.04;letter-spacing:-.055em}.lede{max-width:670px;margin:18px 0 0;color:var(--muted);font-size:1.08rem}.calculator-shell{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(300px,.85fr);gap:20px;align-items:start;margin-bottom:64px}.calculator-card,.results-card{border:1px solid var(--line);border-radius:22px;background:#fff;box-shadow:var(--shadow)}.calculator-card{padding:24px}.unit-toggle{display:grid;grid-template-columns:1fr 1fr;gap:4px;padding:4px;border-radius:12px;background:#edf2f0}.unit-toggle 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16px;padding:11px;border-radius:9px;background:#fff0ed;color:#96372b;font-size:.82rem}.formula-line{margin:15px 0 0;color:var(--muted);font-size:.76rem}.content-wrap{max-width:820px}.content-section{padding:30px 0;border-top:1px solid var(--line)}.content-section h2{font-size:1.65rem}.content-section h3{margin:24px 0 5px;font-size:1.05rem}.content-section p,.content-section li{color:#435350}.formula-box{margin:18px 0;padding:18px;border-left:4px solid var(--brand);border-radius:0 10px 10px 0;background:#edf6f4;font-weight:700}.table-wrap{overflow-x:auto}.content-table{width:100%;border-collapse:collapse}.content-table th,.content-table td{padding:11px;border-bottom:1px solid var(--line);text-align:left}.content-table th{font-size:.78rem;text-transform:uppercase;letter-spacing:.04em}.faq-item{border-bottom:1px solid var(--line)}.faq-item summary{padding:18px 0;cursor:pointer;font-weight:750}.faq-item p{margin:0 0 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