:root{color-scheme:light;--bg:#f7f5ef;--surface:#fff;--text:#1d2520;--muted:#647067;--line:#dbe4dc;--green:#2f7d5b;--green-dark:#215c43;--blue:#349bdd;--orange:#e98438;--soft-green:#e9f1e8;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:16px;line-height:1.55;color:var(--text);background:var(--bg);font-synthesis:none;-webkit-font-smoothing:antialiased}
*{box-sizing:border-box}body{margin:0}button,input{font:inherit}button,a,input,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button,a{touch-action:manipulation}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible,[role=button]:focus-visible{outline:3px solid #2f7d5b;outline-offset:5px}button{color:var(--text)}[hidden]{display:none!important}svg{display:block}button svg,.back-link svg,.takeaway svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;left:16px;top:-100px;z-index:100;padding:10px 20px;background:#fff}.skip-link:focus{top:8px}
.site-header{height:65px;border-bottom:1px solid var(--line);background:rgba(255,255,255,.55)}.header-inner,main{width:min(1370px,calc(100% - 112px));margin-inline:auto}.header-inner{height:100%;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:inline-flex;align-items:center;gap:20px;font-size:19px;font-weight:650;letter-spacing:-.02em}.brand-mark{display:grid;place-items:center;min-width:45px;height:40px;padding:0 7px;border-radius:7px;background:var(--green);color:white;font-size:19px;font-weight:850;letter-spacing:0}.back-link{display:inline-flex;gap:10px;align-items:center;font-size:16px;color:#55625b}.back-link:hover,.page-footer a:hover{color:var(--green)}main{padding:31px 0 28px}.intro h1{font-size:clamp(32px,4.2vw,61px);letter-spacing:-.045em;line-height:1.14;font-weight:780;margin:0 0 11px;color:#151d19}.intro>p{font-size:clamp(17px,1.8vw,25px);line-height:1.45;color:#59645e;margin:0 0 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svg{stroke-width:3.3;width:18px;height:18px}.check-control{display:flex;align-items:center;gap:10px;font-size:14px;color:#526057;cursor:pointer;white-space:nowrap}.check-control input{accent-color:var(--green);width:19px;height:19px;margin:0;cursor:pointer}.engine-panels{display:grid;gap:20px;outline:none}.engine-panel{background:var(--surface);border:1px solid #d1dcd5;border-radius:9px;min-width:0;overflow:hidden}.panel-heading{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:16px 23px 0;min-height:53px}.panel-title{display:flex;align-items:center;gap:20px}.panel-title h2{font-size:21px;line-height:1.25;letter-spacing:-.035em;margin:0;font-weight:730}.panel-title>span{font-size:14px;color:#59635e;border-left:1px solid var(--line);padding-left:19px}.switch-control{display:flex;align-items:center;gap:13px;font-size:13px;color:#59635e;cursor:pointer;position:relative}.switch-control 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text{font-family:inherit;fill:#27352d;user-select:none}.diagram-scroll{overflow:hidden}.control-band{border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:20px;padding:20px 24px 17px;min-height:87px}.demand-control{display:flex;align-items:flex-start;gap:24px;flex:1;max-width:480px}.demand-control>label{font-size:15px;white-space:nowrap;padding-top:0}.slider-stack{width:min(100%,300px);min-width:100px;flex:1}.slider-stack input{accent-color:var(--green);display:block;width:100%;height:20px;margin:0;cursor:pointer}.range-ends{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin-top:3px}.range-ends output{font-size:11px;font-variant-numeric:tabular-nums;color:#748078}.response{display:flex;align-items:center;gap:13px;padding-inline:12px;font-size:14px;white-space:nowrap}.response-bars{display:flex;align-items:flex-end;gap:4px;height:28px}.response-bars i{display:block;width:12px;background:#e0e6e1;height:var(--bar-height);transition:background .12s}.response-bars i.on{background:var(--green)}.legend{display:flex;align-items:center;justify-content:flex-end;gap:19px;padding-left:22px;border-left:1px solid var(--line);font-size:12px;color:#59635e;white-space:nowrap}.legend>span{display:flex;align-items:center;gap:8px}.dot{width:11px;height:11px;display:inline-block;border-radius:50%}.dot.fresh{background:var(--blue)}.dot.hot{background:var(--orange)}.shaft-line{width:25px;height:4px;border-radius:3px;background:var(--green)}.diagram-note{margin:0;padding:2px 26px 15px;color:var(--green-dark);font-size:13px;line-height:1.55}.interaction-hints{display:flex;gap:18px;align-items:center;padding:11px 1px 0;font-size:12px;color:#727e75}.interaction-hints .power-control{margin-left:auto;font-size:12px;gap:7px}.interaction-hints input{width:15px;height:15px}.text-button{border:0;background:transparent;color:var(--green-dark);padding:0;font-size:14px;display:inline-flex;align-items:center;gap:10px;min-height:32px}.text-button:hover{text-decoration:underline;text-underline-offset:4px}.interaction-hints .text-button{font-size:12px}.inspector{display:grid;grid-template-columns:290px 1fr;gap:32px;border-top:1px solid var(--line);margin-top:14px;padding-top:21px}.component-picker{border-right:1px solid var(--line);padding-right:27px}.component-picker h2{font-size:15px;font-weight:680;margin:0 0 14px;letter-spacing:-.02em}.component-buttons{display:flex;gap:11px}.component-buttons button{border:1px solid #cfdad2;border-radius:7px;background:transparent;width:43px;height:44px;font-size:16px;position:relative}.component-buttons button[aria-pressed=true]{background:var(--green);color:white;border-color:var(--green)}.component-buttons button:hover:not([aria-pressed=true]){background:#edf0e9}.component-copy h3{margin:0 0 2px;font-size:23px;line-height:1.35;letter-spacing:-.035em}.component-copy p{margin:0;font-size:16px;color:#4e5c53;line-height:1.55}.component-copy .detail-copy{font-size:12px;color:#6b776e;margin-top:4px}.takeaway{display:flex;gap:10px;align-items:center;padding:11px 14px;background:var(--soft-green);border-radius:7px;margin-top:14px;color:var(--green)}.takeaway p{font-size:13px;color:var(--green-dark);line-height:1.5}.takeaway svg{width:21px;height:21px;stroke-width:2.1}.footer-actions{display:flex;align-items:center;gap:24px;margin-top:27px}.footer-actions>button+button{border-left:1px solid #ced8ce;padding-left:24px}.footer-actions svg{width:17px;height:17px}.page-footer{display:flex;align-items:center;justify-content:space-between;gap:20px;color:#7b857b;font-size:11px;border-top:1px solid #e0e5db;margin-top:22px;padding-top:14px}.page-footer a{font-size:12px}.stroke-controls{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:4px 24px 12px}.stroke-buttons{display:flex;flex-wrap:wrap;gap:8px}.stroke-buttons button{display:inline-flex;align-items:center;gap:8px;padding:6px 11px;border:1px solid var(--line);border-radius:6px;background:transparent;font-size:13px;min-height:38px}.stroke-buttons button>span{width:23px;height:23px;display:grid;place-items:center;border:1px solid var(--line);border-radius:50%;font-size:12px}.stroke-buttons button[aria-pressed=true]{background:var(--green);color:white;border-color:var(--green)}.stroke-buttons button[aria-pressed=true]>span{border-color:#ffffff80}.next-stroke{background:var(--green);color:#fff;border-color:var(--green);font-size:13px;min-height:38px;padding:7px 12px;white-space:nowrap}.next-stroke:hover{background:var(--green-dark)}.next-stroke svg{width:16px;height:16px}.stroke-description{padding:0 24px 13px;display:flex;gap:8px;flex-wrap:wrap;font-size:12px;line-height:1.5;color:#607066}.stroke-description strong{color:var(--green-dark)}#valve-state{margin-left:auto;color:#758078;font-size:11px}.cycle-label{font-size:12px;font-variant-numeric:tabular-nums;color:#67756b;white-space:nowrap}.comparison{border-top:1px solid var(--line);padding-top:22px;margin-top:19px}.comparison h2{font-size:27px;letter-spacing:-.035em;margin:0 0 7px}.comparison>p{font-size:15px;color:#5c6b60;max-width:850px;margin:0 0 20px}.comparison-table{overflow:auto;border:1px solid var(--line);border-radius:8px;background:#ffffff8c}.comparison table{border-collapse:collapse;width:100%;text-align:left;font-size:14px;line-height:1.55}.comparison th,.comparison td{padding:15px 20px;border-bottom:1px solid var(--line);vertical-align:top}.comparison thead th{color:var(--green-dark);background:#edf2e9;font-size:14px}.comparison tbody th{font-weight:550;width:20%}.comparison td{width:40%;color:#58685d}.comparison tr:last-child>*{border-bottom:0}.comparison .comparison-note{font-size:12px;margin-top:15px;color:#727d73}.is-compare .engine-panels{grid-template-columns:1fr 1fr;gap:18px}.is-compare .panel-heading{padding:17px 17px 0;flex-wrap:wrap;gap:10px}.is-compare .panel-title{gap:8px;flex-wrap:wrap}.is-compare .panel-title>span{border:0;padding:0;font-size:12px}.is-compare .panel-title h2{font-size:19px;width:100%}.is-compare .switch-control{font-size:11px;gap:7px}.is-compare .switch-track{width:34px;height:20px;padding:3px}.is-compare .switch-track:after{width:14px;height:14px}.is-compare .switch-control input:checked+.switch-track:after{transform:translateX(14px)}.is-compare .engine-scene>svg{min-height:225px}.is-compare .control-band{padding:15px;flex-wrap:wrap;gap:10px}.is-compare .demand-control{max-width:none;gap:15px;flex-basis:100%}.is-compare .demand-control>label{font-size:13px}.is-compare .response{font-size:12px;padding:0}.is-compare .response-bars{height:22px}.is-compare .response-bars i{width:8px;max-height:23px}.is-compare .legend{padding:0;border:0;font-size:10px;gap:10px}.is-compare .stroke-controls{padding:4px 15px 10px;gap:8px;flex-wrap:wrap}.is-compare .stroke-buttons{gap:5px}.is-compare .stroke-buttons button{font-size:11px;padding:4px 7px;gap:5px;min-height:32px}.is-compare .stroke-buttons button>span{width:18px;height:18px;font-size:10px}.is-compare .next-stroke{font-size:11px;min-height:32px}.is-compare .stroke-description{padding:0 15px 12px;font-size:11px}.is-compare .stroke-description #valve-state{margin-left:0}.is-compare .diagram-note{font-size:11px;padding-inline:16px}.is-compare #jet-panel{display:flex;flex-direction:column}.is-compare #jet-panel .control-band{margin-top:auto}.sources{margin-top:25px;padding:19px 24px;border:1px solid var(--line);border-radius:8px;background:#ffffff70}.sources:not([open]){display:none}.sources summary{font-weight:650;font-size:17px;cursor:pointer}.source-columns{display:grid;grid-template-columns:1.2fr 1fr;gap:45px;padding-top:6px}.sources h2{font-size:17px;letter-spacing:-.02em;margin:20px 0 10px}.sources p{font-size:13px;color:#5d6c61;line-height:1.7}.sources ol{padding-left:20px}.sources li{padding-left:3px;margin:0 0 14px;font-size:13px;color:#57685b}.sources li a{color:var(--green-dark);text-decoration:underline;text-underline-offset:3px}.sources li span{display:block;margin-top:3px;font-size:12px;color:#718077}.source-caption{padding-top:8px;border-top:1px solid var(--line)}.notice{padding:16px;border:1px solid var(--green);background:white;margin-bottom:20px}
@media(min-width:1600px){main{padding-top:38px}.intro>p{margin-bottom:32px}.engine-scene>svg{aspect-ratio:1100/330}}
@media(max-width:1190px){.header-inner,main{width:calc(100% - 64px)}.intro h1{font-size:45px}.intro>p{font-size:20px}.control-band{gap:14px;padding-inline:20px;flex-wrap:wrap}.demand-control{max-width:none;flex:1}.legend{width:100%;justify-content:center;padding:9px 0 0;border:0;border-top:1px solid #edf0eb}.response{padding-right:0}.inspector{grid-template-columns:255px 1fr;gap:25px}.component-buttons{gap:8px}.component-buttons button{width:38px;height:41px}.component-picker{padding-right:20px}.tabs button{padding-inline:20px}.is-compare .legend{width:auto;padding:0;border:0}.is-compare .stroke-controls{align-items:flex-start}.is-compare .panel-heading{min-height:93px;align-content:flex-start}}
@media(max-width:820px){.header-inner,main{width:calc(100% - 36px)}.brand{font-size:17px;gap:12px}.brand-mark{width:40px;height:36px;font-size:17px}.back-link{font-size:14px;gap:6px}main{padding-top:27px}.intro h1{font-size:36px;max-width:650px}.intro>p{font-size:17px;max-width:590px;margin-bottom:23px}.toolbar{flex-wrap:wrap;gap:15px}.tabs{width:auto}.tabs button{font-size:14px;padding:10px 20px}.playback{gap:16px}.button{min-height:40px;padding:8px 13px}.panel-heading{padding:16px 16px 0;flex-wrap:wrap;gap:12px}.panel-title{gap:13px}.panel-title h2{font-size:20px}.panel-title>span{font-size:12px;padding-left:13px}.switch-control{font-size:12px}.engine-scene{padding:0}.control-band{padding:15px 17px;gap:12px}.demand-control{gap:15px}.demand-control>label{font-size:13px}.response{font-size:12px;gap:10px}.response-bars i{width:9px}.legend{font-size:11px;gap:23px}.inspector{grid-template-columns:1fr;gap:16px;padding-top:17px}.component-picker{border:0;padding:0;display:flex;align-items:center;gap:20px}.component-picker h2{margin:0;font-size:14px}.component-buttons button{width:37px;height:37px;font-size:14px}.component-copy h3{font-size:23px}.component-copy p{font-size:15px}.component-copy .detail-copy{font-size:12px}.takeaway p{font-size:12px}.interaction-hints{flex-wrap:wrap;gap:8px 15px;font-size:11px}.interaction-hints .power-control{font-size:11px}.footer-actions{margin-top:25px}.stroke-controls{padding:5px 17px 10px;flex-wrap:wrap;gap:10px}.stroke-description{padding-inline:17px;font-size:11px}#valve-state{margin-left:0}.cycle-label{font-size:11px}.is-compare .engine-panels{grid-template-columns:1fr}.is-compare .engine-scene>svg{min-height:0}.is-compare .panel-heading{min-height:58px;align-items:center;justify-content:space-between}.is-compare .panel-title{gap:13px}.is-compare .panel-title h2{width:auto}.is-compare .panel-title>span{border-left:1px solid var(--line);padding-left:13px}.is-compare .demand-control{flex-basis:auto}.is-compare .control-band{gap:15px}.is-compare .legend{width:100%;justify-content:center;border-top:1px solid var(--line);padding-top:9px}.is-compare .stroke-buttons button{font-size:12px;min-height:35px}.source-columns{grid-template-columns:1fr;gap:0}.comparison th,.comparison td{padding:12px;font-size:12px}.comparison thead th{font-size:12px}.comparison h2{font-size:25px}.page-footer{margin-top:22px}}
@media(max-width:520px){.header-inner,main{width:calc(100% - 28px)}.site-header{height:58px}.brand{font-size:15px;gap:9px}.brand-mark{min-width:36px;height:33px;font-size:15px}.back-link{font-size:12px;gap:3px}.back-link svg{width:16px}.intro h1{font-size:36px;line-height:1.1;max-width:360px;letter-spacing:-.045em;margin-bottom:12px}.intro>p{font-size:15px;line-height:1.55;margin-bottom:23px;max-width:360px}.toolbar{gap:12px}.tabs{width:100%}.tabs button{flex:1;font-size:12px;padding:10px 8px;min-height:43px;white-space:nowrap}.playback{width:100%;justify-content:space-between;gap:12px}.playback-button{min-width:94px}.check-control{font-size:12px}.panel-title{display:block}.panel-title h2{font-size:18px}.panel-title>span{display:block;border:0;padding:4px 0 0;font-size:11px}.panel-heading{gap:7px;padding:14px 13px 0;align-items:flex-start}.switch-control{font-size:10px;gap:6px;margin-top:4px;max-width:140px}.switch-control>span:first-child{max-width:95px;line-height:1.35}.switch-track{width:33px;height:20px;padding:3px;flex-shrink:0}.switch-track:after{width:14px;height:14px}.switch-control input:checked+.switch-track:after{transform:translateX(13px)}.engine-scene>svg{min-width:580px;width:100%;height:auto;aspect-ratio:1100/360}.diagram-scroll{overflow-x:auto;overscroll-behavior-x:contain;scrollbar-width:thin;scrollbar-color:#c0cec2 #f6f8f4}.engine-scene{min-width:580px}.control-band{padding:13px;gap:13px}.demand-control{flex-basis:100%;max-width:none;gap:18px;align-items:center}.demand-control>label{font-size:12px;padding-bottom:12px}.slider-stack{max-width:none}.response{font-size:11px;padding:0;gap:10px;flex:1}.response-bars{gap:3px;height:20px}.response-bars i{width:8px;max-height:21px}.legend{font-size:10px;gap:10px;width:auto;border:0;padding:0;flex-wrap:wrap;max-width:165px;justify-content:flex-end}.legend>span{gap:5px}.dot{width:9px;height:9px}.shaft-line{width:18px;height:3px}.interaction-hints>span{width:100%}.interaction-hints>span:after{content:" Swipe diagrams to see every part."}.interaction-hints .power-control{margin-left:0}.interaction-hints .text-button{margin-left:auto}.component-picker{display:block}.component-picker h2{margin-bottom:11px;font-size:13px}.component-buttons{gap:10px}.component-buttons button{width:42px;height:39px}.component-copy h3{font-size:21px}.component-copy p{font-size:14px}.component-copy .detail-copy{font-size:11px;line-height:1.7}.takeaway{align-items:flex-start;padding:11px}.takeaway p{font-size:12px}.takeaway svg{margin-top:2px}.footer-actions{gap:13px;margin-top:22px}.footer-actions>button+button{padding-left:13px}.footer-actions .text-button{font-size:12px;gap:6px}.footer-actions svg{width:14px}.page-footer{font-size:10px;gap:8px;align-items:flex-start}.page-footer>span{max-width:120px}.page-footer>a{font-size:11px}.cycle-label{font-size:10px;margin-top:4px}.stroke-controls{padding:4px 13px 11px;gap:10px}.stroke-buttons{display:grid;grid-template-columns:1fr 1fr;width:100%;gap:7px}.stroke-buttons button{font-size:11px;min-height:34px;padding:4px 8px;gap:6px}.stroke-buttons button>span{width:21px;height:21px;font-size:11px}.next-stroke{font-size:11px;min-height:34px;padding:6px 10px;margin-left:auto}.stroke-description{padding-inline:13px;font-size:11px;gap:3px 7px}.stroke-description>span{line-height:1.6}#valve-state{font-size:10px}.comparison>p{font-size:13px}.comparison th,.comparison td{padding:10px 8px;font-size:11px}.comparison tbody th{width:20%}.comparison td{width:40%}.comparison thead th{font-size:11px}.comparison h2{font-size:23px}.sources{padding:16px}.sources summary{font-size:15px}.sources p{font-size:12px}.sources li{font-size:12px}.is-compare .panel-title{display:block}.is-compare .panel-title h2{width:auto}.is-compare .panel-title>span{border:0;padding:4px 0 0;font-size:11px}.is-compare .panel-heading{align-items:flex-start;padding:14px 13px 0}.is-compare .demand-control{flex-basis:100%}.is-compare .legend{width:auto;border:0;padding:0;justify-content:flex-end}.is-compare .engine-scene>svg{min-width:580px}.is-compare .stroke-buttons button{font-size:11px}.diagram-note{font-size:11px;padding-inline:13px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;scroll-behavior:auto!important}}
.diagram-tools{display:none}
.compare-only{display:none}
.is-compare .compare-only{display:block}
.exhaust-intro{margin:0 0 21px;max-width:930px}
.exhaust-intro h2{font-size:25px;line-height:1.3;letter-spacing:-.03em;margin:0 0 8px}
.exhaust-intro p{font-size:14px;line-height:1.65;color:#5c6b60;margin:0}
.gas-key{color:#985321}.power-key{color:var(--green-dark)}
.exhaust-summary{margin:17px 17px 0;padding:13px 15px;border-left:3px solid var(--orange);background:#fff7ed;border-radius:0 6px 6px 0}
.exhaust-summary .exhaust-route{font-size:11px;color:#985321;font-weight:600;letter-spacing:.01em;margin:0 0 5px}
.exhaust-summary h3{font-size:16px;letter-spacing:-.02em;line-height:1.4;margin:0 0 5px}
.exhaust-summary p{font-size:12px;line-height:1.6;margin:0;color:#645c50}
@media(max-width:520px){
 .exhaust-intro h2{font-size:22px}.exhaust-intro p{font-size:13px}
 .exhaust-summary{margin:14px 13px 0;padding:11px 12px}
 .exhaust-summary h3{font-size:15px}
}
@media(max-width:520px){
 .diagram-tools{display:flex;justify-content:flex-end;padding:5px 13px 0}
 .diagram-tools .text-button{font-size:11px;gap:6px;min-height:31px}
 .diagram-tools svg{width:16px;height:16px}
 .engine-scene,.engine-scene>svg,.is-compare .engine-scene>svg{min-width:0}
 .diagram-scroll.is-zoomed .engine-scene,.diagram-scroll.is-zoomed .engine-scene>svg{min-width:860px}
 .legend,.is-compare .legend{width:100%;max-width:none;justify-content:center;gap:18px;flex-wrap:nowrap;padding-top:9px;border-top:1px solid #edf0eb}
 .interaction-hints>span:after{content:" Enlarge a diagram for a closer look."}
}