:root{--petrol:#00524d;--teal:#47a89a;--mint:#cbefeb;--ink:#022320;--orange:#d96c3b;--line:rgba(2,35,32,.18);color-scheme:light}
*{box-sizing:border-box}
body{margin:0;min-height:100svh;display:flex;flex-direction:column;font-family:Poppins,Arial,sans-serif;color:var(--ink);background:var(--mint);font-size:16px;line-height:1.55}
a{color:inherit;text-underline-offset:4px}button,input{font:inherit}img{display:block;max-width:100%;height:auto}[hidden]{display:none!important}
:focus-visible{outline:3px solid var(--orange);outline-offset:4px}
.shell{width:min(1320px,calc(100% - 64px));margin-inline:auto}.skip-link{position:fixed;z-index:100;top:-80px;left:16px;padding:12px 16px;background:white}.skip-link:focus{top:12px}
header{background:var(--petrol);color:white}.nav{min-height:84px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{width:166px;height:auto}.back-link{font-size:14px;text-decoration:none}.back-link:hover{color:var(--mint)}
main{flex:1;padding-bottom:40px}.page-top{display:flex;flex-wrap:wrap;gap:12px;padding:24px 0;font-size:14px;color:#365b55}.page-top a{text-decoration:none}.page-top a:hover{text-decoration:underline}
.page-heading{display:flex;align-items:end;justify-content:space-between;gap:32px;margin:10px 0 28px}.kicker{margin:0 0 10px;color:var(--petrol);font-size:12px;font-weight:700;letter-spacing:.16em;text-transform:uppercase}h1{margin:0;font-size:clamp(2rem,4vw,3.4rem);line-height:1.03;letter-spacing:-.055em}.page-heading>p{max-width:38ch;margin:0;color:#365b55;font-size:16px}
.animation{background:white;border:1px solid var(--line)}.animation-scroll{overflow-x:auto;overscroll-behavior-x:contain}.animation-scroll canvas,.animation-scroll>img{display:block;width:100%;min-width:960px;max-width:none;height:auto}.controls{display:flex;align-items:center;flex-wrap:wrap;gap:12px;padding:16px 20px;border-top:1px solid var(--line)}.controls button{min-height:44px;border:1px solid var(--petrol);background:var(--white,#fff);color:var(--petrol);padding:9px 16px;font-size:14px;font-weight:600;cursor:pointer}.controls #play{background:var(--petrol);color:#fff}.controls button:hover{background:var(--mint)}.controls #play:hover{background:var(--ink)}.controls label{display:flex;align-items:center;gap:9px;min-height:44px;font-size:14px;cursor:pointer}.controls input{width:18px;height:18px;accent-color:var(--petrol)}.status{font-size:14px;color:var(--petrol)}.status:empty{display:none}.mobile-hint{display:none;margin:0;padding:10px 14px;background:var(--petrol);color:#fff;font-size:14px}
.comparison-foot{display:flex;align-items:start;justify-content:space-between;gap:28px;margin:20px 0}.note{max-width:80ch;margin:0;font-size:14px;color:#365b55}.video-download{flex-shrink:0;font-size:14px;font-weight:600;color:var(--petrol)}.next-links{display:flex;flex-wrap:wrap;gap:24px;margin:26px 0 0;font-size:14px;font-weight:600}video{display:block;width:100%;height:auto}
footer{background:var(--ink);color:#fff}.footer-row{min-height:94px;display:flex;align-items:center;justify-content:space-between;gap:24px;padding-block:20px}.footer-row>img{width:142px;height:auto}.footer-links{display:flex;flex-wrap:wrap;gap:20px;font-size:13px}.footer-links span{color:#bfd7d4}
@media(max-width:1020px){.mobile-hint{display:block}.page-heading{align-items:start;flex-direction:column;gap:16px}.page-heading>p{max-width:60ch}.comparison-foot{flex-direction:column;gap:14px}}
@media(max-width:760px){.shell{width:calc(100% - 32px)}.nav{min-height:72px}.brand{width:138px}.back-link{font-size:13px}.controls{padding:12px;gap:8px}.controls label{flex-basis:100%}.footer-row{flex-direction:column;align-items:start}.footer-links{gap:12px 20px}}

.section-links{display:flex;flex-wrap:wrap;gap:12px 28px;margin:0 0 24px;font-size:14px;font-weight:600;color:var(--petrol)}
#drive-layout,#efficiency-comparison{scroll-margin-top:24px}
.efficiency-section{margin-top:64px;padding-top:36px;border-top:1px solid var(--line)}
.efficiency-intro{display:flex;align-items:end;justify-content:space-between;gap:32px;margin-bottom:24px}
.efficiency-intro h2{margin:0;font-size:clamp(1.8rem,3.4vw,2.8rem);letter-spacing:-.045em;line-height:1.08}
.efficiency-intro>p{max-width:43ch;margin:0;color:#365b55}
.schematic-note{display:flex;align-items:baseline;gap:12px 24px;margin-bottom:20px;padding:14px 18px;border-left:3px solid var(--orange);background:rgba(255,255,255,.48);font-size:13px;color:#365b55}
.schematic-note strong{flex-shrink:0;color:var(--petrol)}
.efficiency-card{margin:0 0 16px;padding:26px 28px 22px;background:#fff;border:1px solid var(--line)}
.efficiency-card figcaption{display:flex;align-items:center;justify-content:space-between;gap:12px 24px;margin-bottom:22px}
.efficiency-card figcaption>div{display:flex;align-items:baseline;gap:14px}
.chart-number{color:var(--teal);font-size:13px;font-weight:600}
.efficiency-card h3{margin:0;font-size:clamp(1rem,1.7vw,1.3rem);font-weight:600;letter-spacing:-.025em}
.chart-legend{display:flex;flex-wrap:wrap;gap:10px 24px;padding:0;margin:0;list-style:none;font-size:13px}
.chart-legend li{display:flex;align-items:center;gap:8px}
.legend-line{display:inline-block;width:28px;border-top:3px solid var(--petrol)}
.legend-line.reference{border-top:3px dashed var(--orange)}
.difference-formula{margin:0;color:var(--petrol);font-size:14px}
.axis-caption{margin:0 0 10px;color:#365b55;font-size:12px;font-weight:500}
.axis-caption span{font-weight:400}
.efficiency-plot{display:block;width:100%;height:250px;overflow:visible;touch-action:pan-y;cursor:crosshair}
.efficiency-plot line,.efficiency-plot path{vector-effect:non-scaling-stroke}
.plot-grid{stroke:#e4efec;stroke-width:1}
.plot-axis{stroke:#7a9790;stroke-width:1;fill:none}
.curve{fill:none;stroke-width:3;stroke-linejoin:round;stroke-linecap:round}
.curve.zenit,.curve.delta{stroke:var(--petrol)}
.curve.reference{stroke:var(--orange);stroke-dasharray:9 7}
.delta-fill{fill:var(--mint);fill-opacity:.65}
.speed-guide{stroke:#7a9790;stroke-width:1;stroke-dasharray:3 5}
.gap-marker{stroke:var(--teal);stroke-width:5}
.point-marker{stroke:var(--petrol);stroke-width:4;stroke-linecap:round}
.point-marker.reference{stroke:var(--orange)}
.x-axis{display:flex;align-items:baseline;justify-content:space-between;gap:10px;margin:0 2%;font-size:12px;color:#365b55}
.x-axis span:nth-child(2){font-weight:500}
.chart-explanation{font-size:13px;color:#365b55;margin:18px 2% 0}
.speed-explorer{padding:22px 28px;background:var(--petrol);color:white}
.speed-explorer>div{display:flex;justify-content:space-between;flex-wrap:wrap;gap:6px 16px;font-size:14px}
.speed-explorer label{font-weight:600}.speed-explorer span{color:var(--mint);font-size:13px}
.speed-explorer input{display:block;width:100%;height:32px;margin:12px 0 6px;accent-color:var(--mint);cursor:pointer}
.speed-explorer p{margin:0;color:var(--mint);font-size:12px}
.efficiency-context{max-width:100ch;margin:18px 0 0;color:#365b55;font-size:13px}
.efficiency-context a{color:var(--petrol);font-weight:500}
@media(max-width:900px){.efficiency-intro{align-items:start;flex-direction:column;gap:16px}.efficiency-intro>p{max-width:64ch}.efficiency-card figcaption{align-items:start;flex-direction:column}.schematic-note{flex-direction:column;gap:4px}}
@media(max-width:520px){.efficiency-section{margin-top:44px;padding-top:28px}.efficiency-card{padding:20px 14px 18px}.efficiency-plot{height:190px}.chart-legend{font-size:12px;gap:10px 16px}.efficiency-card figcaption>div{gap:10px}.x-axis{font-size:10px;gap:4px}.axis-caption span{display:block}.speed-explorer{padding:18px}.schematic-note{padding:12px 14px}}