:root{color-scheme:light;--ink:#17252e;--muted:#52616b;--paper:#f5f3ed;--white:#fff;--line:#d7dedc;--accent:#08685d;--mint:#d8f2e4;--shell:min(1160px,calc(100% - 48px));font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-synthesis:none}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;min-width:280px;color:var(--ink);background:var(--paper);-webkit-font-smoothing:antialiased}button,input,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:not-allowed}a{color:var(--accent);text-underline-offset:3px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #147e70;outline-offset:4px}button,input,select{min-height:44px}.shell{width:var(--shell);margin-inline:auto}[hidden]{display:none!important}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.skip-link{position:fixed;top:10px;left:10px;transform:translateY(-150%);z-index:20;padding:12px;background:var(--white)}.skip-link:focus{transform:translateY(0)}
.site-header{background:#121c23;color:#fff}.header-inner{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:inline-flex;align-items:center;gap:10px;color:#fff;text-decoration:none;font-size:19px;font-weight:750;letter-spacing:-.5px}.brand span{display:grid;place-items:center;width:30px;height:30px;border-radius:8px;background:#daf7bb;color:#142125}.header-inner nav{display:flex;gap:24px}.header-inner nav a{color:#dee8e9;font-size:14px;text-decoration:none}.header-inner nav a:hover{text-decoration:underline}
.hero{display:grid;grid-template-columns:minmax(0,1fr) 260px;align-items:center;gap:70px;padding-block:62px 46px}.eyebrow{font-size:11px;font-weight:800;letter-spacing:.16em;color:var(--accent);margin:0 0 13px}.hero h1{font-size:clamp(32px,4.3vw,51px);font-weight:680;line-height:1.13;letter-spacing:-2px;margin:0 0 22px}.hero h1 em{font-family:Georgia,"Times New Roman",serif;font-weight:400;color:var(--accent)}.lede{max-width:690px;font-size:17px;line-height:1.7;color:var(--muted);margin:0}.feature-list{display:flex;flex-wrap:wrap;list-style:none;margin:22px 0 0;padding:0;gap:9px 22px;font-size:12px;color:#324851}.feature-list li:before{content:"✓";margin-right:6px;color:var(--accent);font-weight:800}.scale-note{border-top:2px solid var(--ink);padding-top:18px}.scale-note>strong{display:flex;justify-content:space-between;font-size:51px;line-height:1.2;font-weight:500;font-variant-numeric:tabular-nums;letter-spacing:-2px}.scale-note i{font-style:normal;color:#93a39c}.scale-note>div{display:flex;justify-content:space-between;font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.09em;margin-top:7px}.scale-note>p{font-size:12px;line-height:1.7;color:var(--muted);border-top:1px solid var(--line);padding-top:18px;margin-bottom:0}.section-head{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:20px}.section-head h2{margin:0;font-size:25px;letter-spacing:-.8px;line-height:1.25}.section-head .eyebrow{margin-bottom:8px}.local-badge{border:1px solid #c4d9cc;padding:8px 11px;border-radius:30px;font-size:11px;color:#245442;white-space:nowrap}
.workbench{margin-bottom:68px}.example-strip{border:1px solid var(--line);border-radius:14px 14px 0 0;display:flex;align-items:center;flex-wrap:wrap;gap:6px 9px;padding:12px 20px;background:#ecefe7}.example-strip>span{font-size:12px;font-weight:700;margin-right:9px}.example-strip button{border:1px solid #ccd7d1;border-radius:7px;padding:8px 12px;background:#fff;color:#27423b;font-size:12px;min-height:36px}.example-strip button:hover{border-color:var(--accent);background:#f6fff8}.workbench-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);border:1px solid var(--line);border-top:0;border-radius:0 0 14px 14px;background:var(--white);overflow:clip;box-shadow:0 16px 35px #233e3010}.input-panel,.result-panel{padding:27px 30px;min-width:0}.input-panel{border-right:1px solid var(--line)}.result-panel{background:#fafbf8}.panel-heading{display:flex;align-items:center;gap:10px;margin-bottom:22px}.panel-heading h3{font-size:18px;letter-spacing:-.45px;margin:0}.step-number{display:grid;place-items:center;border:1px solid #cbd9ce;border-radius:50%;width:28px;height:28px;font-size:10px;font-weight:750;color:#36604b;flex:none}.field{display:grid;gap:8px;font-size:12px;font-weight:650}.field>span{font-size:12px}input,select{border:1px solid #b6c6c1;border-radius:7px;background:#fff;color:var(--ink);padding:10px 11px;min-width:0;width:100%;font-size:14px}input{font-variant-numeric:tabular-nums}input[aria-invalid=true]{border:2px solid #b52828;background:#fff6f2}fieldset{border:0;margin:0;padding:0;min-width:0}legend{font-size:12px;font-weight:700;margin:0 0 10px;padding:0}.scale-fields{display:flex;gap:24px;margin-top:24px}.scale-fields>fieldset{flex:1}.ratio-input{display:flex;gap:10px;align-items:end}.ratio-input>span{height:42px;display:flex;align-items:center;font-size:20px;color:#52616b}.ratio-input label{flex:1;min-width:0;display:grid;gap:5px}.ratio-input label span{font-size:10px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}.field-help{color:var(--muted);font-size:11px;line-height:1.6;margin:10px 0 20px}.dimensions{border-top:1px solid var(--line);padding-top:18px}.dimensions legend{float:left;width:100%;margin-bottom:13px}.dimension-row{display:grid;grid-template-columns:minmax(80px,1fr) minmax(80px,1.25fr) 76px;gap:9px;align-items:center;margin-bottom:9px;clear:both}.dimension-row label{font-size:12px;font-weight:650}.dimension-row label span{font-weight:400;color:var(--muted);font-size:10px;display:block;margin-top:3px}.output-field{margin-top:0}.button{display:inline-flex;align-items:center;justify-content:center;gap:12px;border-radius:8px;font-weight:700;padding:11px 15px;font-size:13px;border:1px solid transparent;line-height:1.4}.button-primary{width:100%;background:var(--accent);color:#fff;justify-content:space-between;margin-top:20px}.button-primary:hover{background:#07584f}.button-secondary{border:1px solid #becdc4;color:#25453b;background:#fff;flex:1;font-size:12px}.button-secondary:hover{background:#eaf4ed}.button:disabled{background:#e2e8e3;color:#59665f;border-color:#ccd5ce}.status{font-size:11px;line-height:1.6;margin:10px 0 0;min-height:18px;color:var(--muted)}.input-error{color:#9e2020;border:1px solid #eac4b9;border-radius:6px;padding:10px;font-size:12px;line-height:1.6;background:#fff4f0}
.empty-result{min-height:395px;display:flex;align-items:center;justify-content:center;flex-direction:column;text-align:center;padding:25px}.ruler-mark{font-family:monospace;font-size:37px;color:#86a697;font-weight:300;border-bottom:1px solid #a9c1b3;padding-bottom:4px;margin-bottom:22px}.empty-result h4{font-size:21px;margin:0 0 10px;font-weight:550;letter-spacing:-.7px}.empty-result p{font-size:13px;line-height:1.7;max-width:310px;color:var(--muted);margin:0}.export-actions{display:flex;gap:9px;margin-top:20px}.result-table-wrap{overflow-x:auto}table{width:100%;border-collapse:collapse;font-size:13px;font-variant-numeric:tabular-nums}thead th{text-align:left;font-size:10px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);padding:0 0 10px;font-weight:600;border-bottom:1px solid var(--line)}tbody th,tbody td{padding:13px 6px 13px 0;text-align:left;border-bottom:1px solid #e0e6df;font-weight:400}tbody td:last-child{font-weight:750;color:#0b5e4c;font-size:16px;overflow-wrap:anywhere}tbody th{font-size:12px}td{overflow-wrap:anywhere}.scale-summary{display:grid;grid-template-columns:1fr 1fr;gap:15px;padding:22px 0 8px}.scale-summary>div{display:grid;gap:8px;min-width:0}.scale-summary span{font-size:10px;color:var(--muted)}.scale-summary strong{font-size:29px;font-weight:600;letter-spacing:-1px;overflow-wrap:anywhere}.result-help{font-size:11px;color:var(--muted);line-height:1.6;margin:5px 0 20px}.comparison{margin:0 0 18px;padding:12px;background:#edf2ec;border-radius:9px;border:1px solid #dae4d9}.comparison svg{display:block;width:100%;height:auto;overflow:visible}.comparison svg text{font:12px ui-sans-serif,sans-serif;fill:#31483d}.input-bar{fill:#a3b9a8}.output-bar{fill:#16785d}.diagram-axis{stroke:#b7c7bb;stroke-width:1;fill:none}.comparison figcaption{font-size:10px;line-height:1.6;color:#4a6453;padding:0 9px 2px}.spatial-details{border-block:1px solid var(--line);padding:12px 0}.spatial-details summary{font-size:12px;font-weight:650;cursor:pointer;min-height:28px;align-content:center}.spatial-details dl{margin:8px 0}.spatial-details dl>div{display:flex;gap:16px;justify-content:space-between;padding-block:6px}.spatial-details dt,.spatial-details dd{font-size:12px}.spatial-details dd{margin:0;font-weight:700;overflow-wrap:anywhere}.spatial-details p,.precision-note{font-size:10px;color:var(--muted);line-height:1.6}.precision-note{margin-bottom:0}
.explanation{margin-bottom:50px}.method-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px;margin-top:28px}.method-number{font-size:10px;letter-spacing:.08em;color:var(--accent);font-weight:750}.method-grid h3{font-size:18px;line-height:1.4;letter-spacing:-.45px;margin:12px 0}.method-grid p{font-size:13px;line-height:1.75;color:var(--muted)}.method-grid .formula{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:11px;background:#e5ebe2;color:#234c35;border-radius:7px;padding:12px;overflow-wrap:anywhere}.limits-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:36px}.note-card{padding:24px;background:#eceee6;border:1px solid #d4dcd1;border-radius:11px}.note-card h3{margin:0 0 14px;font-size:16px;letter-spacing:-.3px}.note-card p,.note-card li{font-size:12px;color:#495b52;line-height:1.8}.note-card ul{padding-left:17px;margin:0}.note-card li+li{margin-top:8px}.note-card p:last-child{margin-bottom:0}.faq{max-width:800px;margin-bottom:60px}.faq h2{font-size:25px;letter-spacing:-.6px;margin:0 0 22px}.faq details{padding:16px 0;border-top:1px solid var(--line)}.faq details:last-child{border-bottom:1px solid var(--line)}.faq summary{font-size:14px;font-weight:650;cursor:pointer;line-height:1.6}.faq p{font-size:13px;line-height:1.8;color:var(--muted)}.site-footer{border-top:1px solid #bac8bd;padding-block:30px;display:flex;align-items:center;flex-wrap:wrap;gap:12px 22px}.footer-brand{color:var(--ink);text-decoration:none;font-weight:750;letter-spacing:-.4px}.site-footer p,.site-footer a:not(.footer-brand),.site-footer small{font-size:11px;color:var(--muted)}.site-footer nav{display:flex;flex-wrap:wrap;gap:12px;margin-left:auto}.site-footer small{width:100%;font-size:10px}
@media(min-width:1000px){.result-panel{align-self:start;position:sticky;top:20px}.workbench-grid{overflow:visible}.result-panel{border-radius:0 0 14px 0}}
@media(max-width:850px){.hero{gap:35px;grid-template-columns:minmax(0,1fr) 210px}.hero h1{font-size:37px}.input-panel,.result-panel{padding:23px 21px}.method-grid{gap:20px}.dimension-row{grid-template-columns:minmax(65px,1fr) minmax(65px,1fr) 65px}.scale-fields{gap:14px}.ratio-input{gap:5px}.scale-summary strong{font-size:25px}.site-footer nav{width:100%;margin:0}}
@media(max-width:680px){:root{--shell:calc(100% - 32px)}.header-inner{min-height:62px}.header-inner nav{gap:17px}.header-inner nav a{font-size:12px}.header-inner nav a:first-child{display:none}.hero{grid-template-columns:1fr;padding-block:37px 30px;gap:25px}.hero h1{font-size:36px;letter-spacing:-1.5px;margin-bottom:18px}.lede{font-size:15px}.scale-note{display:none}.feature-list{gap:8px 14px;font-size:11px}.section-head{align-items:start;margin-bottom:16px}.section-head h2{font-size:22px}.local-badge{display:none}.example-strip{padding:12px;gap:7px}.example-strip>span{width:100%;margin:0 0 2px}.example-strip button{font-size:11px;padding:8px 10px}.workbench-grid{grid-template-columns:1fr}.input-panel{border-right:0;border-bottom:1px solid var(--line)}.input-panel,.result-panel{padding:23px 18px}.dimension-row{grid-template-columns:minmax(75px,1fr) minmax(75px,1.2fr) 72px}.workbench{margin-bottom:44px}.empty-result{min-height:230px;padding:20px 10px}.empty-result h4{font-size:20px}.export-actions{flex-wrap:wrap}.button-secondary{min-width:125px}.scale-fields{gap:14px}.ratio-input input{padding-inline:9px}.method-grid,.limits-grid{grid-template-columns:1fr;gap:22px}.method-grid{margin-top:24px}.method-grid article+article{border-top:1px solid var(--line);padding-top:24px}.method-grid p{font-size:13px}.limits-grid{margin-top:27px}.note-card{padding:20px}.faq{margin-bottom:35px}.faq summary{font-size:13px}.site-footer{gap:10px 16px}.site-footer p{margin:0}.scale-summary strong{font-size:27px}.scale-summary{gap:10px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}