/* 1. Foundations */
:root{--ink:#192d25;--muted:#66706a;--green:#233e30;--lime:#d9ec9a;--paper:#fafbf7;--line:#dfe4db;--white:#fff;--radius:14px;--mono:Consolas,"SFMono-Regular",monospace}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:15px;line-height:1.65;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}button{cursor:pointer}button:disabled{opacity:.6;cursor:wait}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #637d27;outline-offset:4px}input:focus,select:focus{outline:2px solid #7d963e;outline-offset:1px}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.16;letter-spacing:-.035em}h1{font-size:clamp(36px,4.3vw,62px);font-weight:650}h2{font-size:clamp(27px,3vw,36px);font-weight:600}h3{font-size:20px;font-weight:600}p{margin-bottom:1.2rem}.container{max-width:1240px;padding-left:32px;padding-right:32px;margin-inline:auto}.icon{flex-shrink:0;vertical-align:middle}.muted,.quiet-note{color:var(--muted)}.serif{font-family:Georgia,"Times New Roman",serif;font-weight:400;font-style:italic}.eyebrow{font-size:10px;letter-spacing:.13em;font-weight:700;line-height:1.6;margin-bottom:14px}.status-dot{display:inline-block;width:7px;height:7px;background:#809d43;border-radius:50%;margin-right:8px}.button{display:inline-flex;align-items:center;justify-content:center;gap:16px;border:1px solid var(--green);border-radius:7px;padding:13px 20px;background:var(--green);color:#fff;font-size:13px;font-weight:600;line-height:1.5}.button:hover{background:#35553b;border-color:#35553b}.button.secondary{background:transparent;color:var(--ink);border-color:#cdd4c8}.button.secondary:hover{background:#eaf0df}.button.lime{background:var(--lime);color:var(--ink);border-color:var(--lime)}.button.small{padding:8px 13px;font-size:12px}.text-link{display:inline-flex;align-items:center;gap:12px;font-size:12px;font-weight:650}.text-link:hover{text-decoration:underline}.text-link .icon{width:18px}.skip-link{position:absolute;top:-100px;left:12px;z-index:100;background:white;padding:12px}.skip-link:focus{top:12px}.section{padding-top:72px;padding-bottom:72px}[hidden]{display:none!important}
/* 2. Navigation */
.site-header{height:88px;border-bottom:1px solid var(--line);background:var(--paper)}.header-inner{height:100%;display:flex;align-items:center;justify-content:space-between;gap:28px}.brand{display:inline-flex;align-items:center;gap:9px;font-size:24px;font-weight:750;letter-spacing:-1.1px;white-space:nowrap}.brand-mark{display:grid;place-items:center;width:36px;height:36px;border-radius:9px;color:var(--lime);background:var(--ink)}.brand-dot{color:#7b963f}.header-inner nav{display:flex;gap:30px}.header-inner nav a{font-size:12px;font-weight:550;color:#4b564e}.header-inner nav a:hover{color:#1d482b}.header-cta{display:flex;gap:15px;align-items:center;border-left:1px solid var(--line);padding-left:28px;font-size:12px;font-weight:650}.header-cta .icon{width:18px}.menu-toggle{display:none;background:none;border:1px solid var(--line);border-radius:6px;padding:8px 12px}.breadcrumbs{display:flex;align-items:center;flex-wrap:wrap;gap:10px;font-size:11px;color:var(--muted);padding:26px 0}.breadcrumbs a:hover{text-decoration:underline}
/* 3. Homepage */
.hero{padding:64px 0 58px;background:radial-gradient(ellipse at 83% 50%,#e9eddb 0,transparent 52%)}.hero-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:48px;align-items:center}.hero-copy h1{margin-bottom:24px;line-height:1.075;letter-spacing:-2.5px}.hero-copy h1 .serif{color:#657944}.hero-copy>p{font-size:15px;color:#657068;line-height:1.85}.hero-actions{display:flex;gap:12px;margin-top:28px}.hero-notes{display:flex;gap:18px;margin-top:24px;font-size:10px;color:#737b70}.hero-notes .icon{width:13px;height:13px;color:#718d3d;margin-right:3px}.hero-visual{display:block;background:#edf0df;border:1px solid #d7deca;border-radius:16px;padding:21px 22px 0;box-shadow:0 18px 40px -30px #53644240;transform:rotate(-1deg);transition:transform .2s}.hero-visual:hover{transform:rotate(0)}.visual-top{display:flex;justify-content:space-between;font-size:8px;letter-spacing:.05em;color:#64734e}.technical{font-family:var(--mono)}.hero-tires{display:block;width:100%;height:auto;margin:8px 0 12px}.visual-bottom{display:grid;grid-template-columns:1fr 1fr auto;align-items:center;padding:15px 0 18px;border-top:1px solid #cdd6ba;gap:10px}.visual-bottom small{display:block;font-size:8px;letter-spacing:.08em;color:#68764f}.visual-bottom strong{font-family:var(--mono);font-size:28px;font-weight:500;letter-spacing:-1.2px}.visual-bottom strong span{font-size:16px}.round-arrow{display:grid;place-items:center;border:1px solid #bfcdaa;border-radius:50%;width:37px;height:37px}.visual-caption{border-top:1px solid #d7deca;display:flex;justify-content:space-between;font-size:10px;color:#6a7857;padding:11px 0}.visual-caption .icon{width:16px;height:16px}.benefit-strip{border-block:1px solid var(--line);background:#f2f4ec}.benefit-strip .container{display:flex;justify-content:space-between;padding-top:18px;padding-bottom:18px;gap:15px}.benefit-strip span{font-size:10px;color:#626d5b;display:flex;gap:10px;align-items:center}.benefit-strip .icon{width:17px;height:17px}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:32px}.heading-with-number{display:flex;gap:17px;align-items:start}.section-number{display:grid;place-items:center;border:1px solid #d8dfcd;border-radius:5px;width:30px;height:30px;font:11px var(--mono);color:#7a876b;flex-shrink:0;margin-top:2px}.section-heading .eyebrow{margin-bottom:9px;color:#7c865e}.section-heading h2{margin:0;font-size:31px}.category-tabs{display:flex;gap:12px;border-bottom:1px solid var(--line);padding-bottom:19px;margin-bottom:25px;flex-wrap:wrap}.category-tabs button{border:1px solid transparent;background:none;font-size:11px;color:#66715e;border-radius:7px;display:flex;align-items:center;gap:8px;padding:8px 14px}.category-tabs button.active{border-color:#dce4cf;background:#eaf0dd;color:#243b22}.category-tabs .icon{width:16px;height:16px}.category-tabs button>span{font:9px var(--mono);background:#d9e4c3;border-radius:4px;padding:1px 4px}.tool-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.tool-card{display:flex;align-items:center;gap:14px;background:white;border:1px solid var(--line);border-radius:10px;padding:23px 18px;height:100%;min-height:114px;transition:border-color .15s,box-shadow .15s}.tool-card:hover{border-color:#a6b88e;box-shadow:0 4px 15px #233e3008}.tool-icon{border-radius:10px;padding:11px;background:#edf1e4;color:#647b3e;flex-shrink:0;display:flex}.tool-icon .icon{width:24px;height:24px}.tool-icon.fuel{background:#f7efe0;color:#a07a3c}.tool-icon.electric{background:#e8eeee;color:#467567}.card-copy{display:block}.tool-title{display:block;font-size:14px;font-weight:650;line-height:1.4}.tool-description{display:block;font-size:11px;color:var(--muted);line-height:1.7;margin-top:5px}.card-arrow{width:15px;height:15px;margin-left:auto;color:#89937e}.quiet-note{font-size:11px;text-align:center;margin:22px 0 0}.feature-band{background:#203a2d;color:#f2f4e9;padding:58px 0;position:relative;overflow:hidden}.feature-band:after{content:"";position:absolute;width:400px;height:400px;right:-220px;top:-60px;border:1px solid #7c996130;border-radius:50%;box-shadow:0 0 0 40px #7c996108,0 0 0 80px #7c996108;pointer-events:none}.feature-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:100px;align-items:center}.feature-grid h2{font-size:36px;margin-bottom:18px;line-height:1.22}.feature-grid .serif{color:#d4e7a4}.feature-grid>div>p{max-width:490px;color:#b9c6b6;font-size:13px;line-height:1.9}.eyebrow.light{color:#b5ca89}.feature-points>div{display:flex;gap:22px;padding:17px 0;border-bottom:1px solid #ffffff1c}.feature-points>div:last-child{border-bottom:0}.feature-points>div>span{font:11px var(--mono);color:#b8cf91;padding-top:5px}.feature-points h3{font-size:16px;margin-bottom:8px;letter-spacing:-.01em}.feature-points p{font-size:12px;color:#b4c2b0;margin:0}.comparison-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.comparison-card{border:1px solid var(--line);border-radius:10px;padding:22px;background:#fff}.comparison-card:hover{border-color:#97aa7e}.mini-tires{display:flex;gap:14px;margin:4px 0 22px}.mini-tires span{width:49px;height:49px;border:10px solid #3f4e3f;border-radius:50%;box-shadow:inset 0 0 0 2px #a3af91,0 0 0 2px #66765a;background:repeating-conic-gradient(#b9c3a7 0 15deg,#596a4f 15deg 72deg)}.mini-tires span+span{transform:scale(1.025);opacity:.65}.comparison-card h3{font-size:16px;line-height:1.65;letter-spacing:0}.comparison-card h3 small{display:block;font:10px var(--mono);color:#8b947e;margin:3px 0}.comparison-card>div:last-child{display:flex;align-items:center;justify-content:space-between;font:10px var(--mono);color:#6c8052;border-top:1px solid #edf0e8;padding-top:13px}.comparison-card .icon{width:16px;height:16px}.guide-section{background:#f0f3e9;border-block:1px solid var(--line)}.guide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.guide-card{border:1px solid #dce3d2;border-radius:11px;overflow:hidden;background:var(--paper)}.guide-card:hover{border-color:#a1b58c}.guide-art{height:170px;display:flex;align-items:center;justify-content:center;background:#e5ead9;position:relative;overflow:hidden}.art-numbers{flex-direction:column;background:linear-gradient(120deg,#dce4ca,#edf0e3)}.art-numbers>span{font:600 32px var(--mono);letter-spacing:-2px}.art-numbers small{font:8px var(--mono);letter-spacing:.08em;margin-top:14px;color:#6a7b52}.art-muted{color:#839069}.art-width{gap:30px;background:#e8e9df}.tread-block{width:54px;height:115px;border-radius:15px;background:repeating-linear-gradient(125deg,#404b3d 0 7px,#727969 7px 9px,#404b3d 9px 16px);border:7px solid #424e40;transform:rotate(-13deg);box-shadow:8px 7px 10px #31402e18}.tread-block.wide{width:74px}.sidewall-ring{width:145px;height:145px;border:32px solid #394a37;border-radius:50%;box-shadow:0 0 0 2px #738068,inset 0 0 0 3px #8c9c7a;background:repeating-conic-gradient(#889777 0 10deg,#56674a 10deg 72deg);transform:translate(-20px,28px)}.art-measure{font:12px var(--mono);color:#5e7250}.guide-body{padding:24px}.guide-body .eyebrow{font-size:9px;color:#72845c;margin-bottom:12px}.guide-body h3{font-size:20px;min-height:47px;margin-bottom:24px}.guide-body .text-link{font-size:11px}.trust-section{display:grid;grid-template-columns:1fr 1.3fr;gap:100px}.trust-section>div>p{font-size:13px;color:#6b7565;max-width:330px}.trust-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px}.trust-grid .icon{color:#7a8e55;margin-bottom:14px}.trust-grid h3{font-size:15px;margin-bottom:8px}.trust-grid p{font-size:12px;color:#6b7565;margin:0}.site-footer{background:#edf0e5;border-top:1px solid var(--line);padding:45px 0 0}.footer-top{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:45px;padding-bottom:40px}.footer-top h2{font-size:11px;letter-spacing:0;margin:5px 0 15px}.footer-top>div>a:not(.brand),.text-button{display:block;font-size:11px;color:#69745f;margin-bottom:9px}.footer-top a:hover{text-decoration:underline}.footer-top p{font-size:11px;margin:11px 0 0}.footer-bottom{display:flex;justify-content:space-between;border-top:1px solid #d7dfcc;font-size:10px;color:#768169;padding:19px 0;gap:18px}.text-button{background:none;border:0;padding:0;text-align:left;cursor:pointer}
/* 4. Tools and results */
.page-heading{max-width:790px;padding:15px 0 24px}.page-heading h1{font-size:44px;margin-bottom:18px}.page-heading>p{color:var(--muted);font-size:16px;line-height:1.8}.tool-layout{display:grid;grid-template-columns:350px minmax(0,1fr);gap:24px;align-items:start;margin-bottom:50px}.input-panel,.results-panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px}.panel-title{display:flex;align-items:center;gap:10px;font-size:16px;margin-bottom:22px}.panel-title .icon{width:20px}.input-panel fieldset{border:0;margin:0;padding:0}.input-panel fieldset+fieldset{margin-top:25px;border-top:1px solid var(--line);padding-top:22px}.input-panel legend{font-size:11px;text-transform:uppercase;letter-spacing:.08em;font-weight:700;margin-bottom:14px;width:100%;display:flex;align-items:center;gap:8px}.legend-dot{width:8px;height:8px;border-radius:50%;background:#314d3a;display:inline-block}.legend-dot.new{background:#a4b96c}.field{margin-bottom:15px;min-width:0}.field label{display:block;font-size:11px;font-weight:600;margin-bottom:6px;color:#56634e}.input-wrap{display:flex;align-items:center;position:relative}.input-wrap input{padding-right:60px}.input-wrap>span{position:absolute;right:12px;font-size:10px;color:#7c866f;pointer-events:none}input,select{border:1px solid #d3dcc9;border-radius:6px;background:#fff;color:#233829;width:100%;min-height:43px;padding:9px 12px;font-size:13px}input[aria-invalid=true]{border-color:#b04839}.field-row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:9px}.field-row.two{grid-template-columns:repeat(2,minmax(0,1fr))}.field-row input{padding:9px 7px}.help{font-size:11px;line-height:1.75;color:#6e7b61;margin:9px 0 14px}.input-panel>.button{width:100%;margin-top:14px}.swap-button{display:flex;align-items:center;justify-content:center;gap:7px;border:1px solid var(--line);background:#f7f9f2;border-radius:6px;font-size:10px;padding:6px 12px;margin:6px auto 18px}.swap-button .icon{width:15px;height:15px}.input-panel details{border-top:1px solid var(--line);padding-top:15px;margin-top:15px}.input-panel summary{font-size:12px;font-weight:600;cursor:pointer;margin-bottom:15px}.results-header{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:20px}.results-header h2{font-size:20px;margin:0}.results-header>span{font-size:10px;color:#687f4b;background:#f0f5e5;border-radius:5px;padding:4px 8px}.segmented{display:inline-flex;gap:3px;border:1px solid var(--line);border-radius:6px;padding:3px;background:#fafbf7}.segmented button{border:0;background:transparent;padding:6px 11px;border-radius:4px;color:#6e7964;font-size:11px}.segmented button.active{background:#e6edd9;color:#284321}.diagram{background:linear-gradient(#fafcf5,#f1f5e9);border:1px solid #e3e9d9;border-radius:9px;margin-top:15px;padding:6px}.diagram svg{display:block;width:100%;height:auto;max-height:330px}.diagram text{font-family:var(--mono)}.result-actions{display:flex;gap:9px;margin:14px 0 22px;flex-wrap:wrap}.metric-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:20px 0}.metric{border:1px solid #dde6cf;background:#f4f8eb;border-radius:8px;padding:15px 12px}.metric small{display:block;font-size:10px;color:#657552;margin-bottom:7px}.metric strong{font:500 22px var(--mono);letter-spacing:-.8px;overflow-wrap:anywhere;display:block;line-height:1.4}.metric span{font-size:10px;color:#657552;display:block;margin-top:4px}.metric.hero-metric{background:var(--green);color:#e4f1bc;border-color:var(--green)}.metric.hero-metric small,.metric.hero-metric span{color:#bdcea5}.result-note{background:#f0f5e6;border-left:3px solid #91a967;padding:15px 17px;font-size:12px;color:#526344;border-radius:0 7px 7px 0;margin:18px 0;line-height:1.85}.result-note.warning{background:#faf3e7;border-left-color:#ba9251;color:#755b2b}.result-note h3{font-size:14px;margin-bottom:8px}.result-note p:last-child{margin-bottom:0}.table-scroll{overflow-x:auto}table{width:100%;border-collapse:collapse;text-align:left;font-size:12px}caption{text-align:left;font-size:14px;font-weight:600;color:var(--ink);padding:14px 0}th{font-size:10px;font-weight:600;color:#69795a;background:#f5f7f0}th,td{padding:11px 10px;border-bottom:1px solid #e8edde;white-space:nowrap}td:not(:first-child){font-family:var(--mono)}td:first-child{color:#5d6c50}.error{color:#943c2d;background:#fff1eb;padding:12px;border:1px solid #efc6b8;border-radius:6px;font-size:12px;margin:10px 0}.status-message{font-size:11px;min-height:19px;color:#536c32}.detail-section{max-width:850px;margin:45px 0}.detail-section h2{font-size:27px}.detail-section h3{font-size:18px;margin-top:26px}.detail-section p,.detail-section li{font-size:14px;color:#5a6851;line-height:1.9}.formula{background:#edf2e5;border:1px solid #dce5d0;border-radius:8px;padding:20px;font:12px/1.9 var(--mono);white-space:pre-wrap}.faq details{border-bottom:1px solid var(--line);padding:18px 0}.faq summary{cursor:pointer;font-size:14px;font-weight:600}.faq details p{margin:14px 0 0}.related{padding:32px 0 55px;border-top:1px solid var(--line)}.related h2{font-size:25px}.related-links{display:flex;gap:10px;flex-wrap:wrap}.related-links a{font-size:12px;background:#eef3e5;border:1px solid #dce6d0;padding:8px 13px;border-radius:6px}.related-links a:hover{text-decoration:underline}.chart-wrap{border:1px solid var(--line);border-radius:8px;padding:12px;background:#fbfcf8;margin:20px 0}.chart-wrap svg{display:block;width:100%;height:auto}.chart-legend{display:flex;gap:18px;font-size:11px;margin:10px 0}.chart-legend span:before{content:"";display:inline-block;width:18px;height:3px;background:#244633;vertical-align:middle;margin-right:6px}.chart-legend span+span:before{background:#8ea84e}.article{max-width:790px;margin:10px auto 70px}.article .page-heading{padding-bottom:10px}.article h2{font-size:26px;margin-top:38px}.article h3{font-size:20px;margin-top:28px}.article p,.article li{font-size:15px;line-height:1.95;color:#53604c}.article a:not(.button){text-decoration:underline;text-underline-offset:3px;color:#3e632c}.article-meta{display:flex;gap:20px;flex-wrap:wrap;font-size:11px;color:#768469;border-block:1px solid var(--line);padding:12px 0;margin:18px 0 28px}.article-callout{padding:25px;background:#edf3df;border-radius:10px;border:1px solid #dce7c8;margin:30px 0}.article-callout h2{margin-top:0;font-size:22px}.article-callout p{font-size:13px}.directory-group{margin-bottom:48px;scroll-margin-top:24px}.directory-group h2{font-size:26px}.guide-list{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-bottom:50px}.guide-list>a{display:block;border:1px solid var(--line);padding:25px;border-radius:10px;background:white}.guide-list>a:hover{border-color:#acbd92}.guide-list h2{font-size:21px;margin-bottom:12px}.guide-list p{font-size:13px;color:var(--muted);margin-bottom:12px}.consent{position:fixed;bottom:20px;left:20px;right:20px;max-width:600px;background:#fff;border:1px solid #ccd8bc;border-radius:10px;padding:22px;box-shadow:0 8px 35px #18352025;z-index:50}.consent p{font-size:13px}.consent>div{display:flex;gap:10px;flex-wrap:wrap}.consent a{text-decoration:underline}.ad-placement{min-height:120px;background:#f5f6f0;margin:45px 0;text-align:center}.ad-placement small{font-size:10px}.noscript{padding:15px;background:#fff4d7;border:1px solid #dfcb93}
/* Grid children must shrink below a wide result table's intrinsic width. */
.input-panel,.results-panel{min-width:0}.table-scroll{max-width:100%}.input-panel fieldset{min-width:0}
/* Audit contrast adjustments for small supporting text on the paper and white surfaces. */
:root{--muted:#59665b}.help{color:#5f6c54}.section-heading .eyebrow{color:#5b6a46}.footer-top>div>a:not(.brand),.text-button{color:#586651}.footer-bottom{color:#62705a}
/* 5. Responsive layouts */
@media(min-width:1400px){.hero{padding-block:80px}.hero-copy h1{font-size:65px}.hero-grid{gap:64px}}
@media(max-width:1100px){.header-inner nav{gap:18px}.hero-grid{gap:26px}.hero-copy h1{font-size:49px}.hero-notes{gap:10px;font-size:9px}.tool-grid{grid-template-columns:repeat(2,1fr)}.tool-layout{grid-template-columns:310px minmax(0,1fr)}.metric-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.comparison-grid{grid-template-columns:repeat(2,1fr)}.feature-grid{gap:60px}.visual-top .technical{display:none}.trust-section{gap:55px}}
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@media(max-width:480px){.container{padding-inline:18px}.hero-copy h1{font-size:45px;letter-spacing:-1.7px}.eyebrow{font-size:9px}.hero-actions{flex-direction:column;align-items:stretch}.hero-actions .button{padding:13px 16px}.hero-notes{gap:9px;font-size:9px;justify-content:space-between}.hero-visual{padding:16px 14px 0}.visual-top{font-size:7px}.visual-bottom strong{font-size:25px}.visual-bottom small{font-size:7px}.benefit-strip span{font-size:9px;gap:7px}.section-heading{display:block}.section-heading>.text-link{margin:16px 0 0 47px}.tool-grid{grid-template-columns:1fr}.tool-card{min-height:95px;padding:19px}.category-tabs{gap:4px}.category-tabs button{font-size:10px;padding:7px 9px}.category-tabs button .icon{width:14px}.comparison-grid{gap:10px}.comparison-card{padding:17px 13px}.comparison-card h3{font-size:14px}.comparison-card>div:last-child{font-size:9px}.mini-tires span{width:42px;height:42px;border-width:9px}.guide-card{display:block}.guide-art{height:160px;min-height:0}.feature-grid h2{font-size:31px}.trust-grid{gap:25px 22px}.footer-top{gap:30px 20px}.footer-top>div:first-child{grid-column:1/-1}.footer-bottom{display:block}.footer-bottom span{display:block;margin-bottom:5px}.page-heading h1{font-size:33px}.page-heading>p{font-size:14px}.input-panel,.results-panel{padding:20px 16px}.metric-grid{grid-template-columns:1fr 1fr}.metric strong{font-size:20px}.result-actions .button{font-size:10px;padding:8px 9px}.segmented button{font-size:10px}.article p,.article li{font-size:14px}}
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