@font-face{font-family:Plex;src:url(/assets/fonts/plex-ui.woff2)format("woff2");font-weight:100 700;font-style:normal;font-display:swap}:root{--ink:#283b40;--blue:#526d78;--green:#bcc6b4;--ochre:#aa873f;--camel:#d4b997;--paper:#f3eddf;--white:#fcfaf5;--muted:#526063;--line:#b4b5a8;--text:Plex,Arial,sans-serif;--max:1200px;--gutter:40px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{background:var(--paper);color:var(--ink);font:400 17px/1.55 var(--text);-webkit-font-smoothing:antialiased;margin:0}a{color:inherit;text-underline-offset:4px}a:hover{text-decoration-thickness:2px}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--blue);outline-offset:4px}button,input,select{font:inherit;color:inherit}button{cursor:pointer}img{max-width:100%;height:auto}.wrap{max-width:calc(var(--max) + 2 * var(--gutter));padding:0 var(--gutter);margin-inline:auto}.skip-link{background:var(--ink);color:#fff;z-index:3;padding:12px;position:absolute;top:-100px;left:16px}.skip-link:focus{top:12px}.sr-only{clip-path:inset(50%);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.site-header{align-items:center;gap:45px;padding-top:30px;padding-bottom:28px;display:flex;position:relative}.site-header:after{content:"";bottom:0;left:var(--gutter);right:var(--gutter);border-bottom:2px solid var(--ink);position:absolute}.wordmark{flex-shrink:0;width:224px;display:block}.brand-mark{aspect-ratio:2;background:var(--ink);width:100%;display:block;mask:url(/assets/brand/approved-wordmark.png) 50%/contain no-repeat}.header-tagline{margin:0 0 0 auto;font-size:14px;line-height:1.55}.site-nav{gap:28px;font-size:15px;font-weight:500;display:flex}.site-nav a{padding:12px 0;text-decoration:none}.site-nav a:hover{text-decoration:underline}.site-nav span{padding-left:4px}h1,h2,h3,p{margin-top:0}h1{letter-spacing:-1.8px;margin-bottom:22px;font-size:clamp(39px,5vw,64px);font-weight:500;line-height:1.07}h2{letter-spacing:-.6px;margin-bottom:20px;font-size:32px;font-weight:500;line-height:1.2}h3{letter-spacing:-.4px;font-size:24px;font-weight:500;line-height:1.2}.eyebrow{text-transform:uppercase;letter-spacing:1.7px;margin-bottom:18px;font-size:11px;font-weight:500;display:block}.small-note{color:var(--muted);margin:0;font-size:14px}.home-hero{grid-template-columns:1.15fr 1fr;align-items:center;gap:30px;padding:70px 0 72px;display:grid}.home-hero h1{letter-spacing:-2.2px;margin-bottom:26px;font-size:clamp(45px,5.7vw,76px)}.home-hero h1 em{color:var(--blue);font-style:normal}.hero-copy{margin-bottom:28px;font-size:19px;line-height:1.6}.button{border:1px solid var(--blue);background:var(--blue);color:#fff;justify-content:center;align-items:center;gap:32px;min-height:48px;padding:11px 22px;font-size:16px;font-weight:500;text-decoration:none;display:inline-flex}.button:hover{background:var(--ink);border-color:var(--ink)}.button.secondary{color:var(--ink);border-color:var(--ink);background:0 0}.button.secondary:hover{background:var(--green)}.hero-art{aspect-ratio:1;justify-self:end;width:100%;max-width:440px;position:relative}.stamp{aspect-ratio:1;mask:var(--stamp) center/contain no-repeat;background:currentColor;display:block}.stamp-arch{--stamp:url(/assets/brand/shapes/arch.svg)}.stamp-disc{--stamp:url(/assets/brand/shapes/disc.svg)}.stamp-wedge{--stamp:url(/assets/brand/shapes/wedge.svg)}.stamp-hatch{--stamp:url(/assets/brand/shapes/hatch.svg)}.stamp-block{--stamp:url(/assets/brand/shapes/block.svg)}.stamp-step{--stamp:url(/assets/brand/shapes/step.svg)}.hero-art .stamp{position:absolute}.hero-art .stamp-arch{width:69%;color:var(--blue);top:28%;left:9%;transform:rotate(-11deg)}.hero-art .stamp-disc{width:33%;color:var(--camel);top:8%;right:4%;transform:rotate(13deg)}.hero-art .stamp-wedge{width:32%;color:var(--ochre);top:0;left:4%;transform:rotate(12deg)}.hero-art .stamp-hatch{width:39%;color:var(--green);bottom:7%;right:0;transform:rotate(12deg)}.art-caption{font-size:12px;line-height:1.4;position:absolute;bottom:0;left:12%;transform:rotate(-7deg)}.tools-section{border-top:1px solid var(--line);padding:32px 0 38px}.section-heading{justify-content:space-between;align-items:end;gap:30px;margin-bottom:25px;display:flex}.section-heading h2{margin-bottom:0}.section-heading .eyebrow{margin-bottom:12px}.tool-cards{grid-template-columns:1fr 1fr;gap:22px;display:grid}.tool-card{background:var(--white);border:1px solid var(--line);padding:28px 32px 25px;text-decoration:none;transition:border-color .2s;display:block;position:relative}.tool-card:hover{border-color:var(--ink)}.card-top{justify-content:space-between;align-items:center;display:flex}.card-top .eyebrow{margin:0}.card-arrow{font-size:26px;line-height:1}.card-illustration{height:172px;margin:20px 0 24px;position:relative}.card-illustration .stamp{width:166px;height:166px;color:var(--camel);position:absolute;top:4px;left:7px}.yarn-illustration .stamp{color:var(--green);left:12px}.card-illustration svg{fill:none;width:190px;height:166px;stroke:var(--ink);stroke-width:2px;stroke-linecap:round;stroke-linejoin:round;position:relative;transform:rotate(-5deg)}.yarn-illustration svg{transform:rotate(5deg)}.tool-card h3{margin-bottom:13px;font-size:32px}.tool-card p{max-width:31ch;margin-bottom:26px;font-size:16px}.card-link{border-top:1px solid var(--line);justify-content:space-between;gap:18px;padding-top:17px;font-size:15px;font-weight:500;display:flex}.symon-tip{border-left:3px solid var(--blue);background:#e8dcc7;align-items:center;gap:22px;margin:0 0 48px;padding:23px 26px;display:flex}.symon-tip p{margin:0;font-size:16px}.tip-label{flex-shrink:0;align-items:baseline;gap:9px;font-size:14px;display:flex}.symon-signature{aspect-ratio:2103/748;background:var(--ink);align-self:center;width:110px;display:block;mask:url(/assets/brand/symon-signature.png) 50%/contain no-repeat}.workbench{padding:0 0 10px}.future-grid{border-top:1px solid var(--line);grid-template-columns:repeat(3,1fr);gap:36px;padding-top:30px;display:grid}.future-grid .stamp{width:46px;color:var(--blue);margin-bottom:20px}.future-grid>div:nth-child(2) .stamp{color:var(--ochre)}.future-grid>div:nth-child(3) .stamp{color:var(--ink)}.future-grid h3{margin-bottom:10px;font-size:21px}.future-grid p{max-width:28ch;color:var(--muted);font-size:15px}.site-footer{justify-content:space-between;align-items:end;gap:25px;margin-top:64px;padding-top:28px;padding-bottom:32px;font-size:13px;display:flex;position:relative}.site-footer:before{content:"";top:0;left:var(--gutter);right:var(--gutter);border-top:2px solid var(--ink);position:absolute}.footer-name{font-size:16px;font-weight:600;text-decoration:none}.site-footer p{margin:5px 0 0}.footer-links{gap:25px;display:flex}.crumbs{color:var(--muted);flex-wrap:wrap;gap:7px;margin:27px 0 35px;font-size:13px;display:flex}.tool-heading{max-width:800px;margin-bottom:32px}.tool-heading .eyebrow{margin-bottom:16px}.summary{max-width:57ch;margin-bottom:26px;font-size:20px}.panel{background:var(--white);border:1px solid var(--line);padding:28px}.calculator-layout{grid-template-columns:minmax(0,1fr) minmax(0,1fr);margin-bottom:28px;display:grid}.calculator-inputs{border-right:0}.panel h2{margin-bottom:24px;font-size:23px}.fields{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;display:grid}.field{flex-direction:column;gap:7px;font-size:14px;font-weight:500;display:flex}.input-wrap{background:#fff;border:1px solid #849194;align-items:center;display:flex}.input-wrap input{outline-offset:0;font-variant-numeric:tabular-nums;background:0 0;border:0;width:100%;min-width:0;height:47px;padding:11px 12px}.input-wrap>span{color:var(--muted);padding-right:13px;font-size:14px}.field select{background:#fff;border:1px solid #849194;width:100%;min-width:0;min-height:48px;padding:11px 12px;font-size:15px}.full-field{margin-top:22px}.field-hint{color:var(--muted);font-size:12px;font-weight:400}.calculator-inputs>.small-note{margin-top:20px}.result-panel{background:#e4e7dc;border-color:#9aa895}.result-label{text-transform:uppercase;letter-spacing:1.5px;margin-bottom:10px;font-size:11px;font-weight:600}.answer{font-variant-numeric:tabular-nums;letter-spacing:-2px;margin-bottom:10px;font-size:58px;font-weight:500;line-height:1.1}.answer span{letter-spacing:0;font-size:27px}.result-description{max-width:38ch;font-size:15px}.backing-diagram{width:100%;max-height:290px;margin:8px 0;display:block}.diagram-legend{color:var(--muted);margin-bottom:20px;font-size:12px}.diagram-legend span{padding-right:17px}.diagram-legend i{vertical-align:-2px;background:var(--blue);width:13px;height:13px;margin-right:5px;display:inline-block}.diagram-legend .quilt-key{border:1px dashed var(--ink);background:0 0}.error-message{border-left:3px solid var(--ink);padding-left:16px}.result-panel .button{min-height:42px;padding:8px 15px;font-size:14px}.math-details{border-bottom:1px solid var(--line);margin:0 0 35px;padding-bottom:16px}.math-details summary{cursor:pointer;min-height:32px;font-size:16px;font-weight:500}.math{font-variant-numeric:tabular-nums;padding-left:22px;font-size:14px;line-height:1.8}.content-body{max-width:760px}.content-body article h2{margin-top:38px;font-size:26px}.content-body article p{line-height:1.75}.sources{border-top:1px solid var(--line);margin-top:35px;padding-top:22px;font-size:13px}.sources h2{margin-bottom:12px;font-size:18px}.sources ul{padding-left:20px}.sources li{margin-bottom:10px}.related{flex-wrap:wrap;gap:12px;padding:0;list-style:none;display:flex}.related a{border:1px solid var(--line);padding:10px 15px;font-size:15px;text-decoration:none;display:block}.related a:hover{background:var(--green)}.related-section{margin-top:38px}.related-section h2{font-size:22px}.chart-panel{max-width:850px;margin-bottom:32px;padding:0}.chart-toolbar{justify-content:space-between;align-items:end;gap:20px;padding:24px 26px 20px;display:flex}.chart-toolbar h2{margin:0 0 4px;font-size:21px}.chart-toolbar p{color:var(--muted);margin:0;font-size:13px}.chart-toolbar .field{flex-shrink:0;width:210px}.chart{border-collapse:collapse;font-variant-numeric:tabular-nums;width:100%;font-size:17px}.chart th{text-transform:uppercase;letter-spacing:1px;background:var(--green);text-align:left;padding:13px 26px;font-size:12px}.chart td{border-bottom:1px solid #deded4;padding:11px 26px}.chart tbody tr:nth-child(2n){background:#f2f0e7}.chart tbody tr:last-child td{border-bottom:0}.chart-empty{margin:0;padding:20px 26px}.chart-note{max-width:65ch;font-size:14px}.page-title{padding-top:45px}.tool-list{border-top:1px solid var(--line);padding:0;list-style:none}.tool-list li{border-bottom:1px solid var(--line)}.tool-list a{justify-content:space-between;gap:25px;padding:21px 0;font-weight:500;text-decoration:none;display:flex}.tool-list .meta{max-width:50ch;font-size:14px;font-weight:400}.draft-banner{background:var(--ink);color:#fff;text-align:center;padding:8px}.plain-page{max-width:760px;padding-top:45px}.plain-page h2{margin-top:32px;font-size:25px}.site-search{--pagefind-ui-scale:.85;--pagefind-ui-primary:var(--ink);--pagefind-ui-text:var(--ink);--pagefind-ui-background:var(--white);--pagefind-ui-border:var(--line);--pagefind-ui-border-width:1px;--pagefind-ui-border-radius:0;--pagefind-ui-font:var(--text);margin-bottom:22px}.site-search .pagefind-ui__search-input{font-weight:400}.site-search .pagefind-ui__result-title{font-weight:500}@media (width>=1000px){.tool-card{min-height:315px;padding-right:200px}.card-illustration{width:170px;height:180px;position:absolute;top:65px;right:22px}.card-illustration svg{width:170px}.tool-card h3{margin-top:38px}.card-top,.card-link{margin-right:-168px}.tool-card p{min-height:74px}}@media (width<=800px){:root{--gutter:24px}.site-header{gap:24px}.wordmark{width:185px}.header-tagline{display:none}.site-nav{gap:22px;margin-left:auto}.home-hero{grid-template-columns:1.4fr 1fr;gap:10px;padding:46px 0 50px}.home-hero h1{font-size:51px}.hero-art{align-self:center}.art-caption{display:none}.hero-copy{font-size:17px}.section-heading{align-items:start}.section-heading h2{font-size:28px}.tool-card{padding:24px}.tool-card h3{font-size:30px}.future-grid{gap:25px}.future-grid h3{font-size:20px}.symon-tip{gap:18px}.symon-tip p{font-size:15px}.calculator-layout{grid-template-columns:1fr}.calculator-inputs{border-right:1px solid var(--line);border-bottom:0}.result-panel{grid-template-columns:1fr 1fr;column-gap:24px;display:grid}.result-panel>div:first-child{align-self:center}.result-panel .backing-diagram{grid-area:1/2}.result-panel .diagram-legend{grid-column:1/-1}.site-footer{align-items:start}.footer-links{flex-direction:column;gap:10px}.summary{font-size:18px}.chart-toolbar{padding:20px}.chart th,.chart td{padding-inline:20px}}@media (width<=550px){:root{--gutter:20px}.site-header{gap:14px;padding-top:22px;padding-bottom:22px}.wordmark{width:158px}.site-nav{gap:15px;font-size:13px}.site-nav span{display:none}.home-hero{padding:36px 0 40px;display:block;position:relative}.home-hero h1{letter-spacing:-1.8px;font-size:47px}.hero-copy{font-size:16px}.hero-art{opacity:.95;width:145px;position:absolute;bottom:25px;right:0}.hero-art .stamp-disc{display:none}.home-hero .button{z-index:1;gap:18px;position:relative}.eyebrow{font-size:10px}.section-heading{margin-bottom:22px;display:block}.section-heading .small-note{margin-top:15px;font-size:13px;display:block}.tool-cards{grid-template-columns:1fr;gap:18px}.tool-card{padding:22px 24px}.card-illustration{width:125px;height:125px;margin:0;position:absolute;top:75px;right:15px}.card-illustration .stamp{width:115px;height:115px}.card-illustration svg{width:125px;height:125px}.tool-card h3{max-width:65%;margin-top:35px;font-size:29px}.tool-card p{max-width:30ch;margin-top:26px;font-size:15px}.card-link{font-size:14px}.card-top .eyebrow{font-size:9px}.symon-tip{margin-bottom:35px;padding:20px;display:block}.tip-label{margin-bottom:10px}.with-signature .tip-label{margin-bottom:14px}.future-grid{grid-template-columns:1fr;gap:19px;padding-top:24px}.future-grid>div{padding-left:62px;position:relative}.future-grid .stamp{width:36px;position:absolute;top:0;left:0}.future-grid p{max-width:100%;font-size:14px}.future-grid h3{margin-bottom:8px}.site-footer{margin-top:40px;font-size:12px;display:block}.footer-links{flex-flow:wrap;gap:20px;margin-top:23px}.crumbs{margin-bottom:28px;font-size:12px}.tool-heading h1{font-size:40px}.summary{font-size:18px}.panel{padding:22px 20px}.fields{gap:16px}.field{font-size:13px}.result-panel{display:block}.answer{font-size:56px}.backing-diagram{max-height:260px}.chart-panel{padding:0}.chart-toolbar{display:block}.chart-toolbar .field{width:100%;margin-top:20px}.chart{font-size:16px}.chart th,.chart td{padding:11px 20px}.tool-list a{display:block}.tool-list .meta{margin-top:7px;display:block}.content-body article h2{font-size:24px}.site-search{--pagefind-ui-scale:.8}}@media (width<=360px){:root{--gutter:16px}.wordmark{width:142px}.site-nav{gap:12px}.home-hero h1{font-size:42px}.hero-art{width:114px;bottom:27px;right:-1px}.tool-card{padding-inline:20px}.card-illustration{width:100px;top:83px;right:8px}.card-illustration svg{width:100px}.card-illustration .stamp{width:92px}.tool-card h3{font-size:27px}.field{font-size:12px}.fields{gap:12px}.input-wrap>span{padding-right:8px}.input-wrap input{padding-left:9px}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}@media print{body{color:#111;background:#fff;font-size:12pt}.site-header,.site-footer,.no-print,.draft-banner,.crumbs,.symon-tip,.related-section,.sources{display:none!important}.wrap{max-width:100%;padding:0}h1,.tool-heading h1{font-size:26pt}.summary{font-size:12pt}.tool-heading{margin-bottom:18px}.calculator-layout{display:block}.calculator-inputs{break-inside:avoid;border:1px solid #999}.result-panel{break-inside:avoid;background:#fff;border:1px solid #999;border-top:0;display:block}.result-panel .backing-diagram{max-height:230px}.field input,.field select{height:auto;min-height:0;padding:5px}.panel{padding:14px}.full-field{margin-top:10px}.fields{gap:10px}.answer{font-size:36pt}.math-details{display:none}.content-body{max-width:100%}.chart-panel{border:0}.chart-toolbar{padding:0 0 12px}.chart-toolbar .field{display:none}.chart{font-size:11pt}.chart th,.chart td{padding:6px 14px}.chart th{background:#eee}.chart tbody tr:nth-child(2n){background:#fff}.chart tr[hidden]{display:table-row}a{text-decoration:none}}@media (width<=550px){.hero-art{width:88px;bottom:27px}.hero-art .stamp-wedge{display:none}.card-illustration{width:110px;height:110px;top:69px}.card-illustration svg{width:110px;height:110px}.card-illustration .stamp{width:100px;height:100px}}@media (width<=360px){.hero-art{width:76px;bottom:29px}.card-illustration{width:95px;top:73px}.card-illustration svg{width:95px}.card-illustration .stamp{width:86px}}.print-only{display:none}@media print{@page{margin:14mm}.print-only{font-size:9pt;display:block}.print-credit{border-top:1px solid #aaa;margin-top:18px;padding-top:10px}body:has(.calculator-layout) .content-body,body:has(.chart-panel) .content-body{display:none}.tool-heading .eyebrow{margin-bottom:10px;font-size:8pt}.tool-heading h1{margin-bottom:12px;font-size:24pt}.tool-heading .summary{margin-bottom:14px;font-size:11pt;line-height:1.4}.calculator-layout{grid-template-columns:1fr 1fr;align-items:stretch;margin-bottom:0;display:grid}.calculator-inputs{border-right:0}.result-panel{border:1px solid #999}.panel h2{margin-bottom:15px;font-size:16pt}.field{font-size:9pt}.field-hint{font-size:8pt}.input-wrap>span{font-size:9pt}.input-wrap input{font-size:11pt}.field select{font-size:9pt}.calculator-inputs>.small-note{margin-top:14px;font-size:9pt}.result-description{font-size:10pt;line-height:1.5}.diagram-legend{font-size:8pt;line-height:1.6}.backing-diagram{height:200px}.result-panel .backing-diagram{max-height:200px}.chart-note{max-width:100%;margin-bottom:14px;font-size:10pt;line-height:1.4}.chart-toolbar h2{margin-bottom:3px;font-size:15pt}.chart-toolbar p{font-size:9pt}.chart-panel{margin-bottom:12px}.chart{font-size:10pt}.chart th{padding:8px 12px;font-size:8pt}.chart tr{break-inside:avoid}.chart-empty,body:has(.chart-panel) .tool-heading .summary{display:none}.chart{line-height:1.1}.chart td{padding:3px 12px}.chart-toolbar{padding-bottom:10px}.chart-panel{background:#fff}}.measurement-controls{border:0;min-width:0;margin:0;padding:0}.measurement-controls:disabled{opacity:.65}