@font-face{font-family:Barlow;src:url('/assets/barlow.ttf') format('truetype');font-display:swap}@font-face{font-family:Display;src:url('/assets/display-italic.ttf') format('truetype');font-weight:900;font-style:italic;font-display:swap}
:root{--ink:#101110;--panel:#262726;--paper:#f0f0e8;--muted:#b9bab4;--line:#3b3d3b;--orange:#ff571c;--pad:clamp(20px,4vw,64px);color-scheme:dark;font-family:Barlow,Arial,sans-serif;color:var(--paper);background:var(--ink);scroll-behavior:smooth;scroll-padding-top:24px}
*{box-sizing:border-box}body{margin:0}a{color:inherit}button,input,select{font:inherit}button,a,summary,select{-webkit-tap-highlight-color:transparent}button,select,summary{cursor:pointer}button:disabled{cursor:default}a:focus-visible,button:focus-visible,select:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #ff571c;outline-offset:4px}img{max-width:100%;height:auto;display:block}p{margin:0;line-height:1.65}h1,h2,h3{margin:0}h1,h2{font:900 italic clamp(35px,4vw,58px)/.97 Display,Impact,sans-serif;letter-spacing:-.015em}em{font-style:inherit;color:var(--orange)}[hidden]{display:none!important}.sr-only,.skip:not(:focus){position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}.skip:focus{position:absolute;z-index:20;background:var(--orange);color:var(--ink);padding:16px}
.tool-header{max-width:1540px;margin:auto;padding:22px var(--pad);display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid var(--line)}.tool-header img,.tool-footer img{width:174px;height:auto}.tool-header nav{display:flex;align-items:center;gap:28px}.tool-header nav a{font-size:13px;font-weight:600;text-decoration:none;min-height:44px;display:inline-flex;align-items:center;gap:24px}.tool-header nav a:hover{color:#ff571c}.tool-header .bike-link{border-left:1px solid var(--line);padding-left:28px}.bike-link span{color:var(--orange);font-size:22px}main{max-width:1440px;margin:auto;padding:0 var(--pad)}.eyebrow,.mini-title{font-size:10px;font-weight:700;letter-spacing:.13em;line-height:1.5}.eyebrow{color:var(--muted)}.mini-title{display:block}.tool-intro{display:grid;grid-template-columns:1.25fr 1fr;gap:55px;align-items:end;padding:52px 0 32px}.tool-intro h1{font-size:clamp(46px,5vw,72px);margin-top:16px}.intro-copy{max-width:44ch;padding-bottom:3px}.intro-copy>.mini-title{color:#ff571c;margin-bottom:12px}.intro-copy p{font-size:18px;line-height:1.5}.intro-copy a{display:inline-flex;gap:22px;font-size:13px;font-weight:600;color:var(--muted);text-underline-offset:5px;margin-top:17px}
.calculator{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line);background:var(--panel);scroll-margin-top:22px}.mix-form{padding:30px 32px;min-width:0}.mix-form fieldset{margin:0;padding:0;border:0;min-width:0}.field-group>label{display:flex;align-items:center;gap:12px;font-size:17px;line-height:1.4;font-weight:600;margin-bottom:13px}.step{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:25px;height:25px;border:1px solid #555753;color:#ff571c;font-size:10px;line-height:1}.mix-form select,.mix-form input{background:#101110;border:1px solid #555753;border-radius:0;color:var(--paper);width:100%;min-height:54px;padding:12px 15px;font-size:17px}.mix-form select{padding-right:32px}.mix-form option{background:#101110;color:var(--paper)}.ratio-line{display:grid;grid-template-columns:auto 1fr;gap:0 22px;align-items:center;padding:20px 0;margin-bottom:17px;border-bottom:1px solid var(--line)}.ratio-line .mini-title{color:#b9bab4;font-size:9px}.ratio-line strong{font-size:48px;line-height:1.1;letter-spacing:-.04em;font-variant-numeric:tabular-nums}.ratio-line strong span{color:var(--orange);margin:0 3px}.ratio-line p{font-size:13px;color:var(--muted);line-height:1.55;padding-top:10px}.ratio-line a{grid-column:1/-1;font-size:11px;line-height:1.5;color:#b9bab4;margin-top:10px;text-underline-offset:4px}.ratio-line a span{color:var(--orange);margin-left:10px}.field-help{font-size:12px;color:var(--muted);line-height:1.6;margin-top:9px}.petrol-group{margin-top:20px}.amount-fields{display:grid;grid-template-columns:1fr 118px;gap:10px}.amount-fields input{font-size:24px;font-weight:700;min-width:0;font-variant-numeric:tabular-nums}.quick-amounts{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:14px}.quick-amounts button{color:#d0d1c9;background:transparent;border:1px solid #555753;padding:8px 5px;min-height:40px;font-size:12px}.quick-amounts button:hover,.quick-amounts button[aria-pressed=true]{border-color:#ff571c;color:#ff571c;background:#262726}.reset-link{display:flex;justify-content:space-between;align-items:center;width:100%;background:none;color:var(--muted);font-size:12px;border:0;padding:19px 0 0;margin-top:2px}.reset-link span{font-size:20px}.custom-ratio{margin-top:14px}.custom-ratio>label{display:block;font-size:13px;margin-bottom:8px}.custom-ratio>div{display:grid;grid-template-columns:1fr 44px;gap:10px;align-items:center}.custom-ratio span{font-size:26px}.custom-ratio input{font-size:21px}.input-error{font-size:13px;line-height:1.5;color:#d0d1c9;margin-top:17px;border-left:2px solid var(--orange);padding-left:12px}#other-ratio{padding:20px 0;border-bottom:1px solid var(--line)}#other-ratio>label{font-size:14px}
.mix-result{display:flex;flex-direction:column;min-width:0;padding:28px 32px;background:var(--paper);color:var(--ink);color-scheme:light}.result-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;border-bottom:1px solid #d0d1c9;padding-bottom:17px}.result-heading>span:last-child{font-size:10px;letter-spacing:.06em;font-weight:700;color:#555753}.result-label{font-size:18px;font-weight:600;margin-top:25px}.oil-result{display:flex;align-items:baseline;gap:14px;margin:2px 0 15px;font-size:clamp(67px,7.5vw,107px);font-weight:800;font-variant-numeric:tabular-nums;letter-spacing:-.055em;line-height:1.12;overflow-wrap:anywhere}.oil-result>span{font-size:26px;letter-spacing:-.02em;font-weight:600}.mix-visual{display:flex;align-items:center;justify-content:space-between;gap:10px;height:111px;margin:20px 0 20px;padding-bottom:8px}.measure{position:relative;align-self:stretch;border:1.5px solid #555753;border-top:0;min-width:65px;width:29%;border-radius:0 0 6px 6px;display:flex;align-items:flex-end;justify-content:center;padding:10px 4px;isolation:isolate}.measure>span{position:absolute;top:-12px;font-size:8px;font-weight:700;letter-spacing:.08em;background:var(--paper);padding:0 4px}.measure-fill{position:absolute;z-index:-1;left:0;right:0;bottom:0;height:70%;background:#d0d1c9;border-radius:0 0 4px 4px}.oil-measure{width:21%;min-width:59px}.oil-measure .measure-fill{height:40%;background:#ff571c}.measure i{position:absolute;left:0;top:12px;bottom:30px;width:10px;background:repeating-linear-gradient(to bottom,transparent 0,transparent 12px,#777a7480 12px,#777a7480 13px)}.measure b{font-size:12px;line-height:1.2;font-variant-numeric:tabular-nums;text-align:center}.mix-sign{font-size:20px;color:#777a74}.mixture-total{max-width:27%;flex:1}.mixture-total strong{display:block;font-size:27px;line-height:1.3;letter-spacing:-.04em;overflow-wrap:anywhere}.mixture-total span{font-size:10px;line-height:1.5;display:block;color:#555753}.mix-summary{font-size:15px;font-weight:600;line-height:1.6;max-width:43ch}.result-actions{display:flex;align-items:center;gap:20px;justify-content:space-between;margin-top:22px}.result-actions button{border:0;color:var(--ink);background:var(--orange);padding:11px 14px;min-height:45px;font-size:12px;font-weight:700;display:inline-flex;gap:15px;align-items:center}.result-actions button:hover{background:#ff571c}.result-actions a{font-size:12px;font-weight:600;line-height:1.4;text-underline-offset:4px}.result-note{font-size:11px;color:#777a74;line-height:1.6;padding-top:21px;margin-top:auto}.empty-result{display:flex;flex-direction:column;justify-content:center;min-height:330px;padding:25px 0}.empty-result>span{font-size:60px;color:#b9bab4}.empty-result h2{font:700 27px/1.2 Barlow,Arial,sans-serif}.empty-result p{font-size:16px;line-height:1.6;max-width:30ch;margin-top:15px;color:#555753}.fuel-warning{display:flex;align-items:flex-start;gap:15px;background:#262726;border:1px solid #b8370e;padding:16px 22px;margin-top:15px}.fuel-warning svg{flex-shrink:0;color:#ff571c;margin-top:3px}.fuel-warning p{font-size:13px;color:#b9bab4}.fuel-warning strong{color:#b9bab4}
.table-section{display:grid;grid-template-columns:1fr 1fr;gap:55px;padding:65px 0;border-bottom:1px solid var(--line);align-items:start}.table-intro h2{margin:15px 0 20px}.table-intro>p:not(.eyebrow){color:var(--muted);max-width:42ch;font-size:15px}.table-intro>.field-help{margin-top:18px;font-size:12px!important}.table-wrap{border:1px solid var(--line);background:var(--panel);padding:22px 24px;min-width:0}table{width:100%;border-collapse:collapse;font-variant-numeric:tabular-nums}caption{text-align:left;font-size:12px;line-height:1.5;color:#d0d1c9;padding-bottom:17px}th,td{padding:13px 5px;border-top:1px solid var(--line);font-size:16px;text-align:right;white-space:nowrap}th:first-child{text-align:left}thead th{font-size:10px;font-weight:600;color:#b9bab4;line-height:1.4}tbody th{font-weight:500}tbody td:nth-child(2){color:#ff571c;font-weight:700}tbody td:last-child{font-size:13px;color:#b9bab4}.table-footnote{font-size:11px;line-height:1.6;color:var(--muted);margin-top:17px;border-top:1px solid var(--line);padding-top:15px}.table-unavailable{font-size:16px;line-height:1.6;min-height:230px;display:flex;align-items:center;max-width:27ch;color:var(--muted)}
.how-section{padding:60px 0;border-bottom:1px solid var(--line)}.section-heading{display:grid;grid-template-columns:1fr 1fr;gap:55px;align-items:end;margin-bottom:30px}.section-heading h2{margin-top:15px}.section-heading>p{color:var(--muted);font-size:15px;max-width:42ch}.mix-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;list-style:none;margin:0;padding:0}.mix-steps li{position:relative;border:1px solid var(--line);background:var(--panel);padding:24px}.step-no{position:absolute;top:25px;right:22px;font-size:11px;color:#979a93}.mix-steps svg{width:55px;height:55px;color:#ff571c;margin-bottom:23px}.mix-steps h3{font-size:21px;line-height:1.3}.mix-steps p{font-size:14px;line-height:1.7;color:var(--muted);margin-top:10px}.oil-section{display:grid;grid-template-columns:1.1fr .9fr;gap:65px;padding:60px 0;border-bottom:1px solid var(--line)}.oil-section h2{margin:15px 0 22px}.oil-section>div>p:not(.eyebrow){font-size:15px;color:var(--muted);margin-top:14px}.oil-section strong{font-weight:600;color:#e6e7de}.text-link{display:inline-flex;gap:20px;color:#ff571c;font-size:13px;line-height:1.5;font-weight:600;margin-top:20px;text-underline-offset:5px}.oil-shopping{border:1px solid var(--line);padding:25px 28px;background:var(--panel)}.oil-shopping>.mini-title{color:#ff571c}.oil-shopping h3{font-size:28px;line-height:1.2;margin:15px 0}.oil-shopping p{font-size:13px;color:var(--muted)}.amazon-link{display:inline-flex;min-height:44px;align-items:center;margin-top:17px;max-width:230px}.amazon-link img{width:100%}.oil-shopping small{font-size:10px;color:#b9bab4;line-height:1.6;display:block;margin-top:5px}.oil-shopping .affiliate-note{font-size:11px;border-top:1px solid var(--line);margin:20px 0 12px;padding-top:17px}.affiliate-note strong{display:block;margin-bottom:7px;color:#ff571c}.faq-section{display:grid;grid-template-columns:1fr 1fr;gap:55px;padding:60px 0}.faq-section h2{margin-top:15px}.faq-list details{border-top:1px solid var(--line)}.faq-list details:last-child{border-bottom:1px solid var(--line)}summary{list-style:none;display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:64px;padding:16px 0;font-size:16px;font-weight:600;line-height:1.4}summary::-webkit-details-marker{display:none}summary span{color:var(--orange);font-size:25px}details[open] summary span{transform:rotate(45deg)}details>p{font-size:14px;color:var(--muted);padding-bottom:22px;line-height:1.75}.trail-cta{display:grid;grid-template-columns:1fr 1fr;gap:35px;align-items:center;padding:20px 35px 25px;margin-bottom:60px;background:var(--panel);border:1px solid var(--line);overflow:hidden}.trail-cta>img{max-height:270px;width:100%;object-fit:contain}.trail-cta h2{font-size:48px;margin:12px 0}.trail-cta p:not(.eyebrow){font-size:14px;color:var(--muted);max-width:44ch}.primary-link{display:inline-flex;align-items:center;gap:35px;background:var(--orange);color:var(--ink);font-size:13px;font-weight:700;padding:13px 20px;min-height:46px;text-decoration:none;margin-top:20px}.primary-link:hover{background:#ff571c}.tool-footer{background:#101110;border-top:1px solid var(--line);padding:30px var(--pad);display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:25px}.tool-footer nav{display:flex;gap:22px;flex-wrap:wrap}.tool-footer nav a{font-size:12px;text-underline-offset:4px;line-height:1.5}.tool-footer>p{width:100%;font-size:10px;color:#b9bab4;border-top:1px solid #3b3d3b;padding-top:20px}.no-script{padding:20px;border:1px solid var(--orange);margin-bottom:20px;font-size:14px}
@media(min-width:1400px){.mix-form,.mix-result{padding:35px 42px}.tool-intro{padding-top:65px}.mix-visual{height:120px}}
@media(max-width:1000px){.tool-intro{gap:35px;grid-template-columns:1.2fr 1fr}.intro-copy p{font-size:16px}.tool-intro h1{font-size:55px}.mix-form,.mix-result{padding:25px 23px}.table-section,.section-heading,.faq-section{gap:35px}.oil-section{gap:35px}.result-actions{gap:14px;flex-wrap:wrap}.mix-steps li{padding:20px}.mix-steps h3{font-size:19px}.mix-visual{gap:7px}.measure{min-width:58px}.oil-measure{min-width:51px}.mixture-total strong{font-size:24px}.table-wrap{padding:20px 18px}}
@media(max-width:760px){:root{--pad:24px}.tool-header{padding-block:17px;gap:16px}.tool-header img{width:148px}.tool-header nav{gap:15px}.tool-header nav a{font-size:11px}.tool-header nav>a:nth-child(2){display:none}.tool-header .bike-link{padding-left:15px;gap:8px}.tool-intro{grid-template-columns:1fr;padding:35px 0 26px;gap:20px}.tool-intro h1{font-size:clamp(46px,8.8vw,65px)}.intro-copy{max-width:55ch}.intro-copy p{font-size:16px}.intro-copy>.mini-title{margin-bottom:8px}.intro-copy a{margin-top:12px}.calculator{grid-template-columns:1fr}.mix-form{padding:25px}.mix-result{padding:25px;min-height:425px}.ratio-line{grid-template-columns:auto 1fr auto;gap:15px}.ratio-line a{grid-column:auto;max-width:15ch;font-size:11px}.petrol-group{margin-top:18px}.oil-result{font-size:90px}.mix-visual{max-width:450px;height:115px}.result-label{margin-top:20px}.mix-summary{max-width:55ch}.result-actions{justify-content:flex-start;gap:28px}.result-note{margin-top:20px;padding-top:0}.empty-result{min-height:290px}.table-section,.section-heading,.oil-section,.faq-section{grid-template-columns:1fr;gap:25px}.table-section,.how-section,.oil-section,.faq-section{padding:42px 0}.table-intro>p:not(.eyebrow),.section-heading>p{max-width:60ch}.table-intro h2,.section-heading h2{font-size:44px}.table-wrap{padding:21px 24px}th,td{padding-block:15px}.mix-steps{gap:12px}.mix-steps li{padding:19px 17px}.mix-steps h3{font-size:18px}.mix-steps p{font-size:13px}.mix-steps svg{width:44px;height:44px;margin-bottom:20px}.step-no{top:20px;right:15px}.oil-shopping{max-width:100%}.faq-section h2{font-size:44px}.trail-cta{padding:22px;gap:20px;grid-template-columns:.9fr 1.1fr;margin-bottom:42px}.trail-cta h2{font-size:38px}.trail-cta .eyebrow{font-size:9px}.trail-cta p:not(.eyebrow){font-size:12px}.tool-footer{padding-top:25px}.tool-footer img{width:148px}}
@media(max-width:480px){:root{--pad:18px}.tool-header img{width:127px}.tool-header nav{gap:12px}.tool-header nav>a:first-child{display:none}.tool-header .bike-link{border:0;padding:0;font-size:12px;gap:12px}.tool-intro h1{font-size:clamp(42px,10.5vw,51px)}.tool-intro .eyebrow{font-size:9px}.intro-copy p{font-size:16px}.mix-form,.mix-result{padding:23px 20px}.ratio-line{grid-template-columns:auto 1fr;gap:0 22px;padding:17px 0 18px;margin-bottom:0}.ratio-line a{grid-column:1/-1;max-width:none;margin-top:8px}.ratio-line strong{font-size:43px}.field-group>label{font-size:16px}.mix-form select{font-size:15px}.amount-fields{grid-template-columns:1fr 100px}.quick-amounts{gap:6px}.quick-amounts button{font-size:11px}.oil-result{font-size:83px}.oil-result>span{font-size:24px}.result-heading{gap:12px}.mix-result{min-height:430px}.mix-visual{height:102px;margin-top:21px}.measure b{font-size:11px}.mixture-total strong{font-size:25px}.result-actions{gap:20px}.result-actions button{font-size:12px}.result-actions a{font-size:11px}.fuel-warning{padding:17px 15px;gap:12px}.fuel-warning svg{width:23px;height:23px}.fuel-warning p{font-size:12px}.table-wrap{padding:20px 16px}th,td{font-size:15px;padding-inline:3px}thead th{font-size:10px}tbody td:last-child{font-size:12px}.table-intro h2,.section-heading h2,.oil-section h2,.faq-section h2{font-size:40px}.mix-steps{grid-template-columns:1fr;gap:12px}.mix-steps li{display:grid;grid-template-columns:50px 1fr;gap:0 17px;padding:23px 20px}.mix-steps svg{grid-row:1/3;margin:3px 0 0;width:45px;height:45px}.mix-steps .step-no{font-size:10px;right:17px;top:18px}.mix-steps h3{font-size:19px;padding-right:22px}.mix-steps p{font-size:14px;margin-top:8px}.trail-cta{grid-template-columns:1fr;padding:22px}.trail-cta>img{max-height:190px}.trail-cta>div{padding:0 4px 6px}.trail-cta h2{font-size:43px}.trail-cta p:not(.eyebrow){font-size:14px}.tool-footer nav{gap:17px 22px}.tool-footer nav a{font-size:12px}}
@media(prefers-reduced-motion:reduce){:root{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}
@media print{:root{color-scheme:light;color:#101110;background:#ffffff}.tool-header,.tool-footer,.mix-form,.tool-intro,.fuel-warning,.how-section,.oil-section,.faq-section,.trail-cta,.result-actions,.intro-copy,.table-intro .field-help{display:none}main{padding:0}.calculator{display:block;border:0}.mix-result{min-height:0;padding:15px 0}.table-section{display:block;padding:20px 0}.table-intro h2{font-size:30px}.table-wrap{background:#ffffff;border-color:#b9bab4;padding:15px 0;color:#101110}.table-wrap *{color:#101110!important}.table-wrap th,.table-wrap td{border-color:#b9bab4}}
/* Keep large batches and decimal results readable at narrow widths. */
.oil-result>output{min-width:0;white-space:nowrap}.oil-result>span{flex-shrink:0;white-space:nowrap}.oil-result.result-medium{font-size:clamp(46px,6vw,80px)}.oil-result.result-long{font-size:clamp(36px,4.8vw,65px)}
@media(max-width:480px){.oil-result.result-medium{font-size:57px}.oil-result.result-long{font-size:40px}}
@media(max-width:350px){.oil-result.result-medium{font-size:48px}.oil-result.result-long{font-size:35px}}