:root{--ink:#18372e;--green:#21664c;--bg:#f6f7f2;--muted:#69756b;--line:#dce3da}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 system-ui,sans-serif}header{background:#fff;border-bottom:1px solid var(--line)}nav{max-width:1160px;margin:auto;padding:22px 28px;display:flex;justify-content:space-between;align-items:center}.brand{font-size:24px;font-weight:800;letter-spacing:-1px}a{color:var(--green)}nav a{text-decoration:none;font-size:14px;font-weight:600}main{max-width:1160px;margin:auto;padding:0 28px}.hero{padding:65px 0 42px;max-width:820px}.eyebrow{text-transform:uppercase;letter-spacing:2px;font-size:12px;font-weight:750;color:var(--green)}h1{font-size:clamp(36px,5.5vw,60px);line-height:1.08;letter-spacing:-2px;margin:16px 0 22px}h2{line-height:1.2;letter-spacing:-.7px;font-size:30px;margin:10px 0}h3{margin:0 0 10px}.hero p{font-size:19px;max-width:610px;color:var(--muted)}.tags{display:flex;flex-wrap:wrap;gap:10px;font-size:12px}.tags span{background:#e9eee4;padding:6px 12px;border-radius:30px}.calculator{background:white;border:1px solid var(--line);border-radius:18px;overflow:hidden;box-shadow:0 12px 38px #16372d06}.heading{padding:28px 32px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;gap:12px}.heading p{margin:8px 0 0;color:var(--muted);font-size:14px}.number{font-size:13px;border:1px solid var(--line);padding:5px 12px;border-radius:20px;white-space:nowrap}.layout{display:grid;grid-template-columns:1.15fr 1fr}form{padding:30px 32px}.fields{display:grid;grid-template-columns:1fr 1fr;gap:18px}.wide{grid-column:1/-1}label{display:block;font-size:13px;font-weight:650;margin-bottom:7px}input,select{width:100%;padding:12px;border:1px solid #cbd6cc;border-radius:7px;background:#fff;color:var(--ink);font:inherit}input:focus,select:focus{outline:2px solid #85bba0;outline-offset:2px}.hint{font-size:12px;color:var(--muted);margin:6px 0 0}button{font:inherit;cursor:pointer;border:0;border-radius:7px;padding:12px 17px;font-weight:650;background:var(--green);color:#fff}.actions{display:flex;gap:12px;margin-top:24px;flex-wrap:wrap}.secondary{background:#edf2eb;color:var(--ink)}.results{background:#edf3e9;padding:32px;display:flex;flex-direction:column;justify-content:center}.result-label{font-size:12px;letter-spacing:1.5px;text-transform:uppercase;font-weight:700}.big{font-size:56px;line-height:1.2;font-weight:750;letter-spacing:-2px;margin-top:18px}.unit{font-size:17px;color:#4f6856;margin:0 0 25px}.result-row{display:flex;justify-content:space-between;gap:20px;border-top:1px solid #d4dece;padding:14px 0;font-size:14px}.note{padding:14px;border-radius:8px;background:#ffffff80;font-size:12px;color:#526555;margin-top:15px}#error{color:#a03030;font-size:14px}.info{display:grid;grid-template-columns:1fr 1fr;gap:38px;margin:48px 0}.info p,.info li{color:var(--muted);font-size:14px}.formula{padding:18px;background:#e9eee4;border-radius:8px;font-family:monospace;font-size:13px}.tools{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin:22px 0 45px}.tool{border:1px solid var(--line);border-radius:10px;padding:22px;background:#fff}.tool p{font-size:13px;color:var(--muted);margin:6px 0}.tool small{font-size:11px;text-transform:uppercase;letter-spacing:1px;color:#7b8777}footer{border-top:1px solid var(--line);padding:25px 0 40px;font-size:12px;color:var(--muted);display:flex;justify-content:space-between;gap:20px}.preview{font-size:11px;background:#f1e9cc;color:#68572c;padding:4px 9px;border-radius:5px}@media(max-width:720px){nav{padding:18px 20px;flex-wrap:wrap;gap:12px}nav .brand{width:100%}main{padding:0 18px}.hero{padding:40px 0 30px}.layout,.info{grid-template-columns:1fr}.heading,form,.results{padding:24px}.tools{grid-template-columns:1fr 1fr}.heading{align-items:start}.number{display:none}footer{flex-direction:column}.big{font-size:48px}}@media print{nav,.hero,.actions,.tools,.more,footer{display:none}body{background:#fff}.calculator{box-shadow:none}.layout{grid-template-columns:1fr 1fr}.info{margin-top:20px}input,select{border:0;padding:0}.results{background:#f1f1f1}}
html{scroll-behavior:smooth;scroll-padding-top:24px}.tool-menu{margin:0 0 42px}.tool-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:24px}.tool-link{display:flex;align-items:center;gap:14px;border:1px solid var(--line);background:white;padding:22px 18px;border-radius:12px;text-decoration:none;transition:transform .18s,border-color .18s,box-shadow .18s}.tool-link:hover{transform:translateY(-3px);border-color:#8caa90;box-shadow:0 10px 25px #18372e0c}.tool-link:focus-visible{outline:3px solid #79a362}.tool-link h3{font-size:17px;margin:2px 0}.tool-link p{font-size:12px;color:var(--muted);margin:0}.tool-link small{font-size:10px;letter-spacing:1px;text-transform:uppercase;color:var(--muted)}.tool-icon{font-size:26px;background:#edf3e9;border-radius:10px;min-width:42px;text-align:center}.tool-arrow{margin-left:auto}.extra-calculator{margin:0 0 24px}.guide-strip{padding:22px 32px;border-top:1px solid var(--line);font-size:13px;color:var(--muted);background:#fbfcf8}.guide-strip strong{color:var(--ink)}.room-row{border:1px solid var(--line);border-radius:9px;padding:14px;margin-bottom:12px}.room-row .fields{gap:12px}.room-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}.room-title button{font-size:12px;padding:5px 10px}.extra-calculator .big{font-size:44px;overflow-wrap:anywhere}.result-row strong{text-align:right}.result-row span{min-width:0}input,select{min-width:0}.fields>div{min-width:0}.error-message{color:#a03030;font-size:14px}.jump-back{display:block;margin:14px 0 26px;font-size:12px;text-align:right}.site-end{margin-top:35px;border-radius:14px;background:var(--ink);color:#fff;padding:30px}.site-end p{color:#d5e3d6;font-size:14px;margin-bottom:0}@media(max-width:850px){.tool-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:440px){.tool-grid{grid-template-columns:1fr}.fields{gap:12px}form,.results,.heading{padding:20px}.guide-strip{padding:20px}.extra-calculator .big{font-size:36px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.tool-link{transition:none}}@media print{.tool-menu,.jump-back,.site-end{display:none}}.fx-box{margin-top:24px;padding:20px;background:#fff;border:1px solid #cbd9c7;border-radius:10px}.fx-value{font-size:28px;font-weight:750;margin-top:14px;overflow-wrap:anywhere}.fx-status{line-height:1.7}.fx-retry{margin:10px 0;font-size:13px}[hidden]{display:none!important}
.breadcrumb{font-size:13px;margin:28px 0 20px;color:var(--muted)}.breadcrumb a{text-decoration:none}.page-intro{padding:4px 0 26px;max-width:780px}.page-intro h1{font-size:clamp(32px,5vw,46px);margin:12px 0}.page-intro p{color:var(--muted)}.related-heading{margin-top:42px}.brand-link{color:var(--ink);text-decoration:none}.tool-menu{scroll-margin-top:20px}footer a{color:var(--green)}@media print{.breadcrumb,.page-intro,.related-heading,.tool-grid,header{display:none}}
.footer-links{display:flex;flex-wrap:wrap;gap:12px 22px;max-width:none;padding:0 0 25px;margin:0;font-size:13px}.footer-links a{font-size:13px}.document-page{max-width:820px;margin:0 auto 48px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:36px}.document-page h2{font-size:23px;margin:32px 0 12px}.document-page p,.document-page li{color:#536257;font-size:15px}.document-page li{margin-bottom:9px}.document-page code{font-size:13px;overflow-wrap:anywhere}.notice{padding:20px;border-left:4px solid #8d9e58;background:#f1f4e9;border-radius:7px}.notice p{margin-bottom:0}.owner-note{padding:16px;background:#fff6df;border-radius:8px}.legal-intro{max-width:820px;margin:auto;padding:30px 0}.legal-intro h1{font-size:clamp(32px,5vw,48px)}@media(max-width:600px){.document-page{padding:22px}.footer-links{gap:14px}.legal-intro{padding-top:10px}}
.flex-measure{display:flex;flex-direction:column;gap:7px}.flex-measure select{font-size:13px;padding:9px;background:#f5f8f1}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.volume-equivalents strong{white-space:pre-line;line-height:1.8}.volume-equivalents{align-items:flex-start}

/* Calculator guidance and visible FAQs */
.calculator-help{margin:36px 0 42px;display:grid;grid-template-columns:1fr;gap:24px}.usage-card,.faq-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:30px 32px}.calculator-help h2{font-size:27px;margin:10px 0 20px}.usage-steps{list-style:none;counter-reset:usage;padding:0;margin:0;display:grid;grid-template-columns:1fr 1fr;gap:22px 30px}.usage-steps li{counter-increment:usage;position:relative;padding-left:46px;font-size:14px;color:#536257;line-height:1.8}.usage-steps li:before{content:counter(usage,decimal-leading-zero);position:absolute;left:0;top:2px;background:#edf3e9;border-radius:9px;color:var(--green);font-weight:750;font-size:12px;padding:6px 9px}.faq-intro{color:var(--muted);font-size:14px;margin-top:-8px}.faq-item{border-top:1px solid var(--line);padding:0}.faq-item summary{font-size:15px;font-weight:650;cursor:pointer;padding:18px 28px 18px 0;position:relative;list-style:none;line-height:1.6}.faq-item summary::-webkit-details-marker{display:none}.faq-item summary:after{content:'+';position:absolute;right:3px;top:17px;font-size:22px;color:var(--green);font-weight:400}.faq-item[open] summary:after{content:'−'}.faq-item summary:focus-visible{outline:2px solid #79a362;outline-offset:3px;border-radius:3px}.faq-item p{font-size:14px;color:#536257;line-height:1.85;margin:0 0 22px;max-width:890px}.help-footnote{font-size:12px;color:var(--muted);padding-top:18px;border-top:1px solid var(--line);margin-bottom:0}@media(max-width:640px){.usage-card,.faq-card{padding:23px 20px}.usage-steps{grid-template-columns:1fr;gap:20px}.calculator-help h2{font-size:24px}}@media print{.calculator-help{display:none}}