:root{color-scheme:light;--bg:#f7f4ea;--surface:#fffdf8;--field:#fffefb;--text:#213c32;--muted:#57675e;--forest:#173c31;--lime:#dcec8e;--line:#d0d7c8;--input-line:#7b8f7e;--result:#e9eddc;--ink:#173c31;--paper:#fffdf8;--tint:#e6ebd5;--accent:#cfdf80;--shadow:0 12px 32px #173c3108;--focus:#527538;--error:#943d2d;--footer:#173c31;--footer-text:#f7f4ea;--texture:#173c3112}
:root[data-theme=dark]{color-scheme:dark;--bg:#12251f;--surface:#1b322a;--field:#13271f;--text:#f1f1e4;--muted:#b7c5b8;--forest:#edf0de;--lime:#dcec8e;--line:#3b5445;--input-line:#738e79;--result:#263f31;--ink:#c4d5b4;--paper:#1b322a;--tint:#2e4935;--accent:#8fa65d;--shadow:0 12px 32px #0002;--focus:#dcec8e;--error:#ffb5a1;--footer:#0d1d17;--footer-text:#edf0de;--texture:#dcec8e14}
@media(prefers-color-scheme:dark){:root[data-theme=system]{color-scheme:dark;--bg:#12251f;--surface:#1b322a;--field:#13271f;--text:#f1f1e4;--muted:#b7c5b8;--forest:#edf0de;--lime:#dcec8e;--line:#3b5445;--input-line:#738e79;--result:#263f31;--ink:#c4d5b4;--paper:#1b322a;--tint:#2e4935;--accent:#8fa65d;--shadow:0 12px 32px #0002;--focus:#dcec8e;--error:#ffb5a1;--footer:#0d1d17;--footer-text:#edf0de;--texture:#dcec8e14}}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.6 'Segoe UI',Arial,sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit;text-underline-offset:4px}button,input,select{font:inherit}button,a,input,select,summary{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--focus);outline-offset:4px}.wrap{width:min(1232px,100%);margin:auto;padding:0 40px}.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip{position:fixed;left:16px;top:-80px;background:var(--lime);color:#173c31;padding:12px 20px;z-index:100}.skip:focus{top:10px}[hidden]{display:none!important}svg{display:block}button svg,.button svg,.text-link svg,.card-cta svg,.result-explainer svg,.footer-top nav svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.7;flex-shrink:0}button{cursor:pointer}.header-wrap{border-bottom:1px solid var(--line)}.header{display:flex;align-items:center;min-height:96px;gap:24px}.brand{font:700 38px/1 Georgia,serif;letter-spacing:-2px;text-decoration:none;display:inline-flex;gap:7px;align-items:center;color:var(--forest)}.spark{display:grid;place-items:center;width:29px;height:29px;border-radius:50%;background:var(--lime);color:#173c31}.spark svg{width:22px;height:22px;stroke:currentColor;stroke-width:1.2}.brand-caption{font-size:11px;line-height:1.4;max-width:100px;color:var(--muted);border-left:1px solid var(--line);padding-left:18px}.header nav{display:flex;gap:26px;align-items:center;margin-left:auto}.header nav a{font-size:13px;text-decoration:none;min-height:44px;display:flex;align-items:center}.header nav a:hover{text-decoration:underline}.nav-search{gap:6px}.nav-search svg{width:18px;height:18px;stroke:currentColor;fill:none;stroke-width:1.6}.theme select{width:auto;min-height:40px;font-size:12px;border-radius:24px;padding:8px 29px 8px 13px;background:var(--surface);border:1px solid var(--line);color:var(--text)}h1,h2,h3{font-family:Georgia,'Times New Roman',serif;font-weight:400;line-height:1.1;letter-spacing:-1px;color:var(--forest)}h1{font-size:clamp(40px,4.65vw,64px);margin:0 0 20px}h2{font-size:36px;margin:0}h3{font-size:25px;margin:0}em{font-weight:400}.eyebrow{font-size:10px;line-height:1.4;letter-spacing:1.8px;text-transform:uppercase;font-weight:700;color:var(--muted);margin:0 0 15px}.tiny-star svg{width:16px;height:16px;stroke:currentColor;stroke-width:1.5}.hero{display:grid;grid-template-columns:1.05fr 1fr;gap:64px;align-items:center;padding:44px 0 48px}.hero .eyebrow{display:flex;gap:9px;align-items:center}.hero-copy{padding:5px 0}.lede{font-size:16px;color:var(--muted);max-width:520px;margin:0;line-height:1.65}.hero .lede{max-width:395px}.actions{display:flex;align-items:center;gap:22px;margin-top:28px}.button,button.calculate-button{background:#173c31;color:#fffdf8;border:1px solid #173c31;text-decoration:none;border-radius:6px;min-height:48px;padding:12px 19px;display:inline-flex;align-items:center;justify-content:center;gap:20px;font-size:14px;font-weight:600}.button:hover,button.calculate-button:hover{background:#284d3d}.micro{font-size:11px;color:var(--muted);line-height:1.5}.hero-art{display:block;border:1px solid var(--line);border-radius:12px 12px 3px 3px;background:var(--surface);text-decoration:none;box-shadow:var(--shadow);overflow:hidden}.art-topline{display:flex;justify-content:space-between;padding:13px 18px;font-size:8px;letter-spacing:1.5px;color:var(--muted);border-bottom:1px solid var(--line)}.hero-drawing{height:208px;position:relative;display:flex;align-items:center;justify-content:center;background:radial-gradient(var(--texture) .8px,transparent .8px) 0 0/9px 9px,var(--tint)}.illustration{width:100%;height:auto;color:var(--ink)}.art-fill{fill:var(--tint)}.art-paper{fill:var(--paper)}.art-accent{fill:var(--accent)}.art-ink{fill:var(--ink)}.hero-drawing>.illustration{width:255px;height:216px;transform:rotate(-3deg)}.measure{position:absolute;border-bottom:1px solid var(--ink);font-size:11px;color:var(--ink);padding-bottom:3px}.measure-a{left:23px;top:36px;transform:rotate(-7deg)}.measure-b{right:17px;bottom:31px;transform:rotate(5deg);font:italic 17px Georgia,serif}.hero-example{padding:16px 22px;display:flex;justify-content:space-between;align-items:center}.hero-example .eyebrow{font-size:8px;margin-bottom:5px;letter-spacing:1.3px}.hero-example strong{font:40px/1.1 Georgia,serif;color:var(--forest)}.hero-example strong small{font:20px Georgia,serif}.hero-example p{font-size:10px;line-height:1.5;margin:8px 0 0;color:var(--muted)}.round-arrow{width:43px;height:43px;background:var(--lime);color:#173c31;display:grid;place-items:center;border-radius:50%;flex-shrink:0}.round-arrow svg{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:1.7}.hero-link{border-top:1px solid var(--line);padding:11px 20px;display:flex;justify-content:space-between;align-items:center;font-size:11px;color:var(--muted)}.hero-link>span{display:flex;gap:10px;color:var(--text);font-weight:600}.hero-link svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:1.7}.directory{border-top:1px solid var(--line);padding:35px 0 48px}.section-head{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:25px}.section-head .eyebrow{margin-bottom:10px}.section-head>p,.section-index{font-size:12px;color:var(--muted);margin:0}.search-row{display:grid;grid-template-columns:1fr 230px;gap:12px}.search-field{position:relative}.search-field>svg{width:21px;height:21px;stroke:var(--muted);stroke-width:1.6;fill:none;position:absolute;left:17px;top:17px}.search-field input{padding-left:50px}.search-row input,.search-row select{height:54px}.search-row input::placeholder{color:var(--muted);opacity:1}input,select{display:block;width:100%;min-height:48px;background:var(--field);color:var(--text);border:1px solid var(--input-line);border-radius:5px;padding:11px 12px;font-size:16px;line-height:1.4}input:hover,select:hover{border-color:var(--forest)}.categories{display:flex;gap:8px;flex-wrap:wrap;padding:16px 0 0}.category{display:flex;align-items:center;gap:9px;border:1px solid var(--line);border-radius:24px;padding:7px 13px;min-height:42px;background:transparent;color:var(--muted);font-size:12px}.category span{font-size:10px;opacity:.85}.category.active{background:var(--text);color:var(--bg);border-color:var(--text)}.category:hover{border-color:var(--forest)}.directory-status{display:flex;align-items:center;justify-content:space-between;min-height:49px}.directory-status p{font-size:11px;color:var(--muted);margin:0}.reset-filters{background:transparent;color:var(--text);border:0;text-decoration:underline;text-underline-offset:3px;font-size:12px;min-height:44px}.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.card{background:var(--surface);border:1px solid var(--line);border-radius:8px;overflow:hidden;text-decoration:none;display:flex;flex-direction:column;transition:transform .18s ease,box-shadow .18s ease}.card:hover{transform:translateY(-3px);box-shadow:0 10px 24px #00000010;border-color:var(--input-line)}.card-art{position:relative;background:radial-gradient(var(--texture) .7px,transparent .7px) 0 0/8px 8px,var(--tint);height:166px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:center}.card-art .illustration{width:178px;height:156px;margin:12px 0 0}.card-category{position:absolute;left:17px;top:12px;font-size:9px;letter-spacing:1.1px;text-transform:uppercase;font-weight:600;color:var(--ink)}.card-arrow{position:absolute;right:14px;bottom:13px;width:30px;height:30px;border:1px solid var(--ink);border-radius:50%;display:grid;place-items:center;color:var(--ink)}.card-arrow svg{width:16px;height:16px;stroke:currentColor;stroke-width:1.5}.card-copy{padding:23px 22px 19px;display:flex;flex-direction:column;flex:1}.card h3{font-size:25px;letter-spacing:-.7px;margin-bottom:11px}.card p{font-size:13px;color:var(--muted);margin:0 0 22px;line-height:1.6}.card-cta{font-size:11px;font-weight:600;display:flex;gap:8px;align-items:center;margin-top:auto}.card-cta svg{width:15px;height:15px}.empty-state{text-align:center;padding:35px 15px;background:var(--surface);border:1px dashed var(--input-line);border-radius:8px}.empty-state p{color:var(--muted)}.empty-state button{border:1px solid var(--input-line);background:var(--result);color:var(--text);min-height:44px;border-radius:5px;padding:10px 17px;display:inline-flex;align-items:center;gap:15px}.how-band{display:grid;grid-template-columns:1fr 1.15fr;gap:70px;padding:38px 42px;margin:0 0 60px;border:1px solid var(--line);background:var(--result);border-radius:8px}.how-band h2{font-size:36px;line-height:1.15;margin-bottom:24px}.text-link{display:inline-flex;align-items:center;gap:11px;font-size:12px}.how-band ul{list-style:none;padding:0;margin:0}.how-band li{padding:14px 0;border-bottom:1px solid var(--line)}.how-band li:first-child{padding-top:0}.how-band li:last-child{border-bottom:0;padding-bottom:0}.how-band h3{font-size:22px;letter-spacing:-.4px}.how-band p:not(.eyebrow){font-size:13px;color:var(--muted);margin:6px 0 0}footer{background:var(--footer);color:var(--footer-text);padding:38px 0 18px}.footer-top{display:grid;grid-template-columns:1fr 1.3fr .8fr;gap:30px;padding-bottom:30px}.footer-top .brand{color:#f7f4ea}.footer-top p{font-size:12px;color:#c0cebf;margin:15px 0 0}.footer-message{font:30px/1.25 Georgia,serif;letter-spacing:-.6px;padding:3px 0}.footer-message em{color:var(--lime)}.footer-top nav{display:flex;flex-direction:column;align-items:start;gap:11px;font-size:12px}.footer-top nav a{text-decoration:none;display:inline-flex;gap:12px;align-items:center;min-height:26px}.footer-top nav a:hover{text-decoration:underline}.footer-bottom{border-top:1px solid #ffffff28;display:flex;justify-content:space-between;gap:20px;padding-top:16px;font-size:10px;color:#c0cebf}.page-intro{padding:40px 0 32px}.breadcrumb{font-size:11px;color:var(--muted);display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:25px}.breadcrumb a{text-decoration:none}.breadcrumb a:hover{text-decoration:underline}.tool-intro{display:grid;grid-template-columns:1fr 200px;gap:40px;align-items:center}.tool-intro h1{font-size:clamp(36px,4vw,52px);margin-bottom:14px}.tool-intro .lede{max-width:720px;font-size:15px}.tool-intro .eyebrow{margin-bottom:11px}.intro-art{background:var(--tint);border-radius:50%;width:174px;height:174px;display:grid;place-items:center;justify-self:end}.intro-art .illustration{width:170px;height:155px}.calculator-workspace{border:1px solid var(--line);border-radius:10px;overflow:hidden;box-shadow:var(--shadow);background:var(--surface);margin-bottom:48px}.calculator-workspace form{display:grid;grid-template-columns:1fr 1fr;align-items:stretch}.input-panel{padding:28px 30px 24px;min-width:0}.panel-heading{display:flex;align-items:center;gap:12px;margin-bottom:26px}.panel-heading h2{font:400 24px/1.15 Georgia,serif;letter-spacing:-.4px;margin:0}.panel-heading p{font-size:11px;line-height:1.5;color:var(--muted);margin:5px 0 0}.panel-mini{width:51px;margin-left:auto}.panel-mini .illustration{height:49px}.fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px 16px}.field{display:block;font-size:13px;font-weight:600;line-height:1.5;min-width:0}.field input,.field select{margin-top:7px;font-weight:400}.fields select{font-size:14px;min-height:48px}.calculate-button{width:100%;margin-top:25px;justify-content:space-between!important;background:var(--lime)!important;border-color:var(--lime)!important;color:#173c31!important}.calculate-button:hover{filter:brightness(.95)}.input-footnote{font-size:10px;color:var(--muted);margin:17px 0 0}.error{font-size:13px;font-weight:600;color:var(--error);padding:12px 0 0;margin:0}.error:empty{display:none}.output-panel{background:var(--result);border-left:1px solid var(--line);padding:28px 30px 24px;min-width:0;display:flex;flex-direction:column}.result{min-width:0;flex:1}.result>strong{font:400 clamp(34px,3.4vw,49px)/1.12 Georgia,serif;color:var(--forest);letter-spacing:-1px;display:block;padding:9px 0 19px;margin-bottom:16px;border-bottom:1px solid var(--input-line);overflow-wrap:anywhere}.result>p{font-size:13px;color:var(--muted);margin:12px 0;line-height:1.7}.result>p:first-of-type{font-size:15px;color:var(--text)}.result-explainer{display:flex;align-items:center;gap:10px;font-size:11px;margin-top:22px;padding-top:15px;border-top:1px solid var(--line)}.result-idle{display:none;flex:1;text-align:center;padding:35px 0}.result[hidden]~.result-idle{display:block}.idle-symbol{display:inline-block;margin:0 0 20px}.idle-symbol svg{height:45px;width:45px;stroke:var(--ink);stroke-width:1}.result-idle h3{font-size:28px}.result-idle p{font-size:14px;color:var(--muted);max-width:260px;margin:12px auto}.tire-help{grid-column:1/-1;font-size:12px;line-height:1.65;color:var(--muted);margin:0}.tire-help code{overflow-wrap:anywhere}.tire-actions{display:flex;gap:10px;margin-top:10px}.tire-actions button{width:50%;border:1px solid var(--input-line);background:transparent;color:var(--text);min-height:44px;border-radius:5px;font-size:12px}.tire-figure{margin:22px 0}.tire-figure svg{display:block;width:100%;height:auto}.tire-outline{fill:var(--ink);stroke:var(--ink);stroke-width:2}.tire-rim{fill:var(--result);stroke:var(--result);stroke-width:2}.tire-mark{stroke:var(--ink);stroke-width:2}.tire-label{fill:var(--text);font:15px 'Segoe UI',sans-serif}.tire-figure figcaption{font-size:11px;color:var(--muted);line-height:1.5}.tire-table{width:100%;border-collapse:collapse;table-layout:fixed;font-size:12px;font-variant-numeric:tabular-nums}.tire-table caption{text-align:left;font-size:11px;margin-bottom:9px;color:var(--muted)}.tire-table th,.tire-table td{text-align:left;border-bottom:1px solid var(--line);padding:10px 5px;overflow-wrap:anywhere;vertical-align:top}.tire-table th:first-child{width:38%}.tire-table th{font-weight:600}.tire-table thead{background:var(--surface)}.explanation-section{padding:0 0 40px}.section-index{font-size:9px;letter-spacing:1.7px}.explanation-grid{display:grid;grid-template-columns:1.1fr 1fr 1fr;gap:32px;border-top:1px solid var(--line);padding-top:26px}.explanation-grid h3{font-size:24px;margin-bottom:18px}.explanation-grid p{font-size:13px;color:var(--muted);line-height:1.8;margin:0 0 18px}.formula{padding:18px;background:var(--result);border-left:2px solid var(--input-line);font:11px/1.9 ui-monospace,Consolas,monospace;overflow-wrap:anywhere}.formula .eyebrow{display:block;font-family:'Segoe UI',sans-serif;font-size:9px;margin:0 0 10px}.example{border:1px solid var(--line);border-radius:5px;padding:17px 18px;margin-bottom:13px;background:var(--surface)}.example-label{font-size:9px;letter-spacing:1.5px;font-weight:600;display:block;color:var(--muted);margin-bottom:8px}.example p{margin:0}.faq details{border-bottom:1px solid var(--line);padding:0 0 15px;margin-bottom:15px}.faq summary{cursor:pointer;font-size:13px;font-weight:600;line-height:1.6;min-height:28px}.faq details p{margin:12px 0 0}.related-section{padding:28px 0 52px;border-top:1px solid var(--line)}.related{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:13px}.related a{display:flex;gap:12px;align-items:center;text-decoration:none;padding:10px 12px;border:1px solid var(--line);border-radius:6px;background:var(--surface)}.related a:hover{border-color:var(--input-line)}.related .illustration{width:47px;height:47px;flex-shrink:0;border-radius:5px;background:var(--tint)}.related a>span{font-size:12px;line-height:1.4}.related small{display:block;font-size:9px;color:var(--muted);margin-top:4px}.related a>svg:last-child{width:16px;height:16px;margin-left:auto;flex-shrink:0;fill:none;stroke:currentColor;stroke-width:1.5}.info-layout{display:grid;grid-template-columns:1fr 300px;gap:80px;padding-bottom:60px;align-items:start}.info-content .page-intro{padding-bottom:18px}.info-content h1{font-size:50px;line-height:1.12}.prose p{font-size:15px;line-height:1.85;color:var(--muted);margin:0 0 20px}.prose h2{font-size:29px;margin:32px 0 12px}.info-aside{border:1px solid var(--line);border-radius:8px;background:var(--result);padding:28px;margin-top:42px}.info-aside .illustration{max-width:190px;margin:0 auto 15px}.info-aside h2{font-size:29px;line-height:1.2}.info-aside p:not(.eyebrow){font-size:13px;color:var(--muted)}.info-aside .button{font-size:12px;margin-top:10px;width:100%}.nojs{padding:15px 25px;background:var(--lime);color:#173c31;margin:0}
[data-tone=kitchen]{--tint:#efe5d6;--accent:#e4b787;--ink:#5c4939}[data-tone=tech]{--tint:#dde8e7;--accent:#a6c6c3;--ink:#31585b}[data-tone=moving]{--tint:#e8e3d6;--accent:#c7bb94;--ink:#5b543f}[data-tone=vehicles]{--tint:#e1e6de;--accent:#b4c5a0;--ink:#3b5140}
:root[data-theme=dark] [data-tone=kitchen]{--tint:#433c2e;--accent:#9d7852;--ink:#e2c8a8}:root[data-theme=dark] [data-tone=tech]{--tint:#263e40;--accent:#5b8a8b;--ink:#b0d2cf}:root[data-theme=dark] [data-tone=moving]{--tint:#3b3e2c;--accent:#909467;--ink:#d4d7b8}:root[data-theme=dark] [data-tone=vehicles]{--tint:#2b3c32;--accent:#809679;--ink:#c4d5b4}
@media(prefers-color-scheme:dark){:root[data-theme=system] [data-tone=kitchen]{--tint:#433c2e;--accent:#9d7852;--ink:#e2c8a8}:root[data-theme=system] [data-tone=tech]{--tint:#263e40;--accent:#5b8a8b;--ink:#b0d2cf}:root[data-theme=system] [data-tone=moving]{--tint:#3b3e2c;--accent:#909467;--ink:#d4d7b8}:root[data-theme=system] [data-tone=vehicles]{--tint:#2b3c32;--accent:#809679;--ink:#c4d5b4}}
@media(min-width:1100px){.cards .card:last-child{grid-column:auto}.hero h1{font-size:60px}}
@media(max-width:1000px){.wrap{padding:0 28px}.header{gap:17px}.brand-caption{display:none}.hero{gap:35px}.hero h1{font-size:49px}.measure-a{left:12px;top:22px}.measure-b{right:10px;bottom:20px}.cards{gap:15px}.card-copy{padding:20px 17px}.card h3{font-size:23px}.input-panel,.output-panel{padding:25px 23px}.explanation-grid{grid-template-columns:1fr 1fr}.faq{grid-column:1/-1}.faq details{display:block}.info-layout{gap:35px;grid-template-columns:1fr 250px}.info-aside{padding:23px}.info-content h1{font-size:44px}.related{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:760px){.header{gap:15px;min-height:82px}.header nav{gap:15px}.header nav a{font-size:12px}.nav-search span{display:none}.hero{gap:23px;padding-top:30px}.hero h1{font-size:42px}.hero .lede{font-size:14px}.hero .actions{gap:12px;flex-wrap:wrap;margin-top:20px}.hero .micro br{display:none}.hero .micro{font-size:10px}.hero-example{padding:15px}.hero-example strong{font-size:32px}.hero-example strong small{font-size:17px}.hero-drawing{height:180px}.hero-drawing>.illustration{width:210px;height:184px}.art-topline{font-size:7px;padding:11px 12px;letter-spacing:1px}.measure{font-size:9px}.measure-b{font-size:14px}.hero-link{padding:10px 13px;font-size:10px}.hero-link>span{gap:5px}.round-arrow{width:34px;height:34px}.cards{grid-template-columns:repeat(2,minmax(0,1fr))}.section-head h2{font-size:30px}.section-head>p{display:none}.how-band{gap:30px;padding:30px}.how-band h2{font-size:31px}.footer-message{font-size:24px}.footer-top{gap:20px}.tool-intro{grid-template-columns:1fr 120px;gap:22px}.intro-art{width:120px;height:120px}.intro-art .illustration{width:115px;height:115px}.tool-intro h1{font-size:38px}.calculator-workspace form{grid-template-columns:1fr}.output-panel{border-left:0;border-top:1px solid var(--line)}.result>strong{font-size:44px}.result{flex:none}.info-layout{grid-template-columns:1fr;gap:0}.info-aside{display:none}.info-content h1{font-size:45px}.prose{max-width:620px}.section-index{display:none}}
@media(max-width:540px){.wrap{padding:0 20px}.header{min-height:0;padding-top:17px;padding-bottom:11px;flex-wrap:wrap;gap:12px}.brand{font-size:34px}.spark{width:26px;height:26px}.theme{margin-left:auto}.theme select{min-height:38px}.header nav{order:3;width:100%;margin:0;justify-content:space-between;gap:12px}.header nav a{min-height:32px;font-size:12px}.nav-search span{display:inline}.hero{grid-template-columns:1fr;padding:27px 0 28px;gap:24px}.hero .eyebrow{font-size:9px;letter-spacing:1.3px;margin-bottom:13px}.hero h1{font-size:42px;line-height:1.05;margin-bottom:14px}.hero .lede{font-size:14px;max-width:320px}.hero .actions{flex-wrap:nowrap;gap:18px;margin-top:18px}.hero .micro br{display:block}.hero .button{min-height:46px;font-size:13px;padding:10px 16px;gap:17px}.hero-art{display:grid;grid-template-columns:42% 58%;position:relative;border-radius:7px}.art-topline{grid-column:1/-1}.art-topline span{font-size:7px}.hero-drawing{height:148px;border-right:1px solid var(--line)}.hero-drawing>.illustration{width:153px;height:143px;max-width:100%;transform:none}.measure{display:none}.hero-example{padding:12px}.hero-example .eyebrow{font-size:7px;line-height:1.4;letter-spacing:1px;margin-bottom:8px}.hero-example strong{font-size:32px;display:block}.hero-example strong small{font-size:14px;display:block;margin-top:2px}.hero-example p{font-size:8px;line-height:1.55;margin-top:9px}.round-arrow{display:none}.hero-link{grid-column:1/-1;padding:10px 12px;font-size:9px}.hero-link>span{font-size:10px}.directory{padding:26px 0 30px}.section-head{margin-bottom:19px;gap:13px}.section-head .eyebrow{font-size:9px;letter-spacing:1.4px;margin-bottom:8px}.section-head h2{font-size:29px;line-height:1.15}.search-row{grid-template-columns:1fr;gap:10px}.search-row input{height:52px}.category-select{display:none}.categories{flex-wrap:nowrap;overflow-x:auto;margin:0 -20px;padding:14px 20px 8px;scrollbar-width:thin}.category{white-space:nowrap;flex-shrink:0;min-height:40px;font-size:11px;padding:6px 12px}.directory-status{min-height:38px}.cards{grid-template-columns:1fr;gap:16px}.card{display:grid;grid-template-columns:110px 1fr;border-radius:7px;min-height:174px}.card-art{height:100%;min-height:174px;border-right:1px solid var(--line);border-bottom:0;align-items:center}.card-art .illustration{width:107px;height:116px;margin-top:6px}.card-category{font-size:7px;left:10px;top:12px;letter-spacing:.6px}.card-arrow{display:none}.card-copy{padding:20px 17px 17px}.card h3{font-size:23px;line-height:1.1;margin-bottom:8px}.card p{font-size:12px;line-height:1.5;margin-bottom:14px}.card-cta{font-size:10px}.how-band{grid-template-columns:1fr;padding:26px 23px;gap:25px;margin-bottom:35px}.how-band h2{font-size:31px;margin-bottom:16px}.how-band h3{font-size:22px}.how-band p:not(.eyebrow){font-size:12px}.footer-top{grid-template-columns:1fr 1fr;gap:25px 15px}.footer-message{grid-column:1/-1;grid-row:2;font-size:28px}.footer-top nav{font-size:11px;gap:10px}.footer-top nav a{min-height:30px}.footer-bottom{font-size:9px;display:block}.footer-bottom span{display:block;margin-bottom:6px}.page-intro{padding:25px 0 23px}.tool-intro{grid-template-columns:1fr;position:relative;gap:0}.tool-intro h1{font-size:36px;margin-bottom:12px;max-width:350px}.tool-intro .lede{font-size:14px;line-height:1.6}.tool-intro .eyebrow{font-size:9px;letter-spacing:1.3px}.breadcrumb{font-size:10px;gap:7px;margin-bottom:22px;padding-right:0}.intro-art{display:none}.calculator-workspace{margin-bottom:33px;border-radius:8px}.input-panel,.output-panel{padding:23px 20px}.panel-heading{margin-bottom:22px;gap:10px}.panel-heading h2{font-size:24px}.panel-heading p{font-size:11px}.fields{gap:17px 13px}.field{font-size:12px}.field input,.field select{font-size:16px;min-height:48px;padding:10px}.fields select{font-size:16px}.input-footnote{font-size:10px}.calculate-button{font-size:14px;margin-top:22px;min-height:48px}.tire-help{font-size:12px}.tire-table{font-size:11px}.tire-table th,.tire-table td{padding:9px 3px}.result>strong{font-size:38px}.result>p{font-size:13px}.result>p:first-of-type{font-size:14px}.explanation-grid{grid-template-columns:1fr;gap:25px;padding-top:22px}.explanation-grid h3{font-size:25px;margin-bottom:14px}.explanation-grid p{font-size:14px;line-height:1.75}.faq{grid-column:auto}.faq summary{font-size:14px;min-height:35px}.formula{font-size:12px}.related-section{padding:25px 0 35px}.related-section .section-head{align-items:start}.related-section .text-link{max-width:85px;font-size:10px;line-height:1.5;margin-top:20px}.related{grid-template-columns:1fr}.related a{min-height:68px;padding:10px 13px}.related a>span{font-size:13px}.related small{font-size:10px}.info-layout{padding-bottom:35px}.info-content h1{font-size:40px}.info-content .page-intro{padding-top:30px}.prose h2{font-size:27px}.prose p{font-size:14px}.info-content .page-intro>.button{margin-top:22px}}
@media(max-width:360px){.wrap{padding:0 16px}.hero h1{font-size:37px}.hero .actions{gap:12px}.hero .button{padding:10px 13px;gap:12px}.hero .micro{font-size:9px}.categories{margin:0 -16px;padding-left:16px;padding-right:16px}.card{grid-template-columns:90px 1fr}.card-art .illustration{width:88px}.card-copy{padding:18px 13px}.card h3{font-size:21px}.card-category{font-size:6.5px;left:7px}.input-panel,.output-panel{padding:22px 16px}.fields{grid-template-columns:1fr}.tool-intro h1{font-size:33px}.result>strong{font-size:34px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}

.mobile-search-anchor:empty{display:none}.mobile-search-anchor .search-field{display:block;margin-top:20px}.mobile-search-anchor input{height:52px}#main:focus:not(:focus-visible){outline:none}
@media(min-width:761px){.cards .card:last-child{grid-column:1/-1;display:grid;grid-template-columns:1fr 2fr}.cards .card:last-child .card-art{height:210px;border-bottom:0;border-right:1px solid var(--line)}.cards .card:last-child .illustration{width:210px;height:190px;margin:10px 0 0}.cards .card:last-child .card-copy{justify-content:center;padding:28px 35px}.cards .card:last-child h3{font-size:32px}.cards .card:last-child p{max-width:430px}.cards .card:last-child .card-cta{margin-top:0}}

.tire-key{margin-top:27px;padding-top:22px;border-top:1px solid var(--line)}.tire-key>.eyebrow{font-size:9px;letter-spacing:1.3px}.tire-size-key{display:flex;align-items:start;justify-content:space-between;gap:8px}.tire-size-key>span{border-top:2px solid var(--input-line);padding-top:9px;flex:1}.tire-size-key strong{font:30px/1.2 Georgia,serif;font-weight:400;color:var(--forest)}.tire-size-key small{display:block;font-size:10px;line-height:1.5;color:var(--muted);margin-top:8px}.tire-size-key>b{font-size:14px;padding-top:15px;color:var(--muted);font-weight:400}.tire-key>p:last-child{font-size:11px;line-height:1.65;color:var(--muted);margin:16px 0 0}.tire-figure svg{max-width:360px;margin:auto}@media(max-width:760px){.tire-key{display:none}}
:is(.network-help,.network-group){grid-column:1/-1}.network-help{font-size:12px;color:var(--muted);line-height:1.6;margin:0}.network-group{min-width:0;margin:4px 0 0;padding:16px;border:1px solid var(--line);border-radius:6px}.network-group legend{padding:0 7px;font-weight:600;font-size:13px}.network-group .fields{margin:0}

/* Readability refinements: retain the existing identity and layout. */
:root{--muted:#46594d;--input-line:#697f6c}
:root[data-theme=dark]{--muted:#c3d0c4;--input-line:#839e89}
@media(prefers-color-scheme:dark){:root[data-theme=system]{--muted:#c3d0c4;--input-line:#839e89}}
body{font-size:16px}
.card p,.explanation-grid p,.prose p,.tool-intro .lede,.hero .lede{font-size:16px}
.card-cta,.category,.header nav a,.footer-top nav,.network-help,.network-group legend,.field,.result>p,.panel-heading p,.result-explainer,.input-footnote,.text-link,.related-section .text-link,.related a>span,.how-band p:not(.eyebrow),.action-status{font-size:14px}
.category span{font-size:13px;opacity:1}
.footer-top p,.footer-bottom,.breadcrumb,.directory-status p,.related small,.tire-key>p:last-child,.tire-size-key small,.theme select,.hero .micro,.micro{font-size:13px}
.eyebrow,.hero .eyebrow,.section-head .eyebrow,.tool-intro .eyebrow,.hero-example .eyebrow,.card-category,.art-topline,.art-topline span,.example-label,.section-index,.tire-key>.eyebrow{font-size:12px;letter-spacing:1px}
.hero-example p,.hero-link,.hero-link>span{font-size:12px}
.formula,.tire-help,.tire-table{font-size:14px}
.faq summary{font-size:16px;min-height:44px}
.footer-top nav a{min-height:40px}.footer-top p,.footer-bottom{color:#d8e2d6}
.start-here{border-top:1px solid var(--line);padding:32px 0 38px}
.start-tools{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.start-tools>a{display:flex;gap:14px;align-items:center;padding:20px 16px;border:1px solid var(--input-line);border-radius:8px;background:var(--surface);text-decoration:none;min-width:0}
.start-tools>a:hover{background:var(--result)}
.start-tools .illustration{width:66px;height:66px;flex-shrink:0;background:var(--tint);border-radius:8px;padding:3px}
.start-tools strong{display:block;font:24px/1.12 Georgia,serif;letter-spacing:-.4px;color:var(--forest)}
.start-tools small{display:block;font-size:14px;line-height:1.5;color:var(--muted);margin-top:8px}
.start-tools>a>svg:last-child{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.7;flex-shrink:0}
.result-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
.result-actions button{font-size:14px;font-weight:600;padding:10px 17px;min-height:44px;border:1px solid var(--input-line);border-radius:5px;background:var(--surface);color:var(--text)}
.result-actions button:hover:not(:disabled){background:var(--tint)}
.result-actions button:disabled{opacity:.55;cursor:not-allowed}
.action-status{margin:12px 0 0;min-height:1.6em;color:var(--muted)}
.copy-fallback{font-size:14px;margin-top:15px}.copy-fallback textarea{width:100%;margin-top:8px;padding:12px;font:14px/1.5 'Segoe UI',sans-serif;color:var(--text);background:var(--field);border:1px solid var(--input-line);border-radius:5px;resize:vertical}
textarea:focus-visible{outline:3px solid var(--focus);outline-offset:4px}
.print-report{display:none}
/* Inactive slots have no layout box. Future activation must reserve space at initial render. */
.ad-placement{min-height:122px;margin:24px 0;contain:layout;max-width:100%}
.ad-placement[hidden],.ad-placement[data-ad-state=inactive]{display:none!important}
@media(max-width:1000px){.start-tools{grid-template-columns:1fr}.start-tools>a{padding:18px 20px}.start-tools>a>span{flex:1}}
@media(max-width:540px){
 .categories{flex-wrap:wrap;overflow:visible;margin:0;padding:14px 0 8px;gap:8px}
 .category{white-space:normal;min-height:44px;font-size:14px;padding:7px 11px}
 .header nav a{font-size:13px;min-height:44px}
 .hero .actions{flex-wrap:wrap}.hero .micro br{display:none}
 .hero-art{grid-template-columns:35% 65%}.hero-example .eyebrow{font-size:11px}.hero-drawing{height:100%;min-height:170px}
 .art-topline,.art-topline span{font-size:11px}.hero-link{flex-wrap:wrap;gap:8px}
 .card-category{font-size:11px;letter-spacing:.3px;left:8px;right:6px;line-height:1.4}
 .card-cta{font-size:14px}.card p{font-size:14px}
 .related-section .text-link{max-width:110px;font-size:13px}
 .tire-table{font-size:12px}.formula{font-size:13px}
 .ad-placement{min-height:282px}
}
@media print{
 @page{margin:16mm}
 html,body{background:white!important;color:#111!important;font:11pt/1.5 Arial,sans-serif!important}
 body>*{display:none!important}body>main{display:block!important;width:auto!important;padding:0!important}
 main>*{display:none!important}main>.print-report{display:block!important;color:#111!important}
 .print-report h2{font:24pt/1.2 Georgia,serif;color:#111!important;margin:0 0 10pt}
 .print-source{font-size:10pt;overflow-wrap:anywhere;margin:0 0 18pt}
 .print-content{white-space:pre-wrap;overflow-wrap:anywhere;orphans:3;widows:3}
 .print-report{border:0!important;box-shadow:none!important}
}