:root{--ink: #17181a;--ink-2: #3c3e43;--ink-muted: #55575c;--panel: rgba(250, 250, 249, .86);--panel-line: rgba(23, 24, 26, .12);--road: #2f6fb3;--track: #c8461b;--focus: #0b57d0;--aero-ms: 1s;--ease: cubic-bezier(.65, 0, .25, 1);color-scheme:light;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;color:var(--ink)}*,*:before,*:after{box-sizing:border-box}html,body{margin:0;min-height:100%}body{min-height:100vh;overflow-x:hidden;background-color:#a9aaad;background-image:radial-gradient(ellipse 70% 55% at 55% 18%,#ffffffbf,#fff0 70%),radial-gradient(ellipse 120% 90% at 50% 45%,#e4e4e5,#c3c4c6,#96979b);background-attachment:fixed}.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}.app{max-width:1180px;margin:0 auto;padding:24px 20px 32px}.app__header{text-align:center}.app__header h1{margin:0;font-weight:300;font-size:clamp(1.6rem,4vw,2.4rem);letter-spacing:.04em}.app__lede{margin:6px 0 0;color:var(--ink-2)}.app__main{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.3fr);gap:20px;margin-top:12px}.stage{grid-column:1 / -1;margin:0;text-align:center}.roadster{display:block;width:100%;height:auto;max-width:1000px;margin:0 auto}.stage__caption{margin-top:-4px;font-size:clamp(1.1rem,2.6vw,1.5rem);font-weight:300;letter-spacing:.06em;color:var(--ink)}.stop-body-top{stop-color:#fff}.stop-body-mid{stop-color:#eeeeec}.stop-body-low{stop-color:#bfc0c2}.stop-glass-a{stop-color:#16181c}.stop-glass-b{stop-color:#3a3e46}.stop-shadow-in{stop-color:#2a2b2e;stop-opacity:.55}.stop-shadow-out{stop-color:#2a2b2e;stop-opacity:0}.roadster__shadow{fill:url(#floor-shadow)}.body__shell{fill:url(#body-shade);stroke:#9a9b9e;stroke-width:1;stroke-linejoin:round}.body__crease{fill:none;stroke:#b4b5b8;stroke-width:1.5}.body__canopy{fill:url(#glass-shade)}.body__glass{fill:#1d2025}.body__sill,.body__lip{fill:#141518}.body__lamp{fill:#e9f2ff;stroke:#6b7280;stroke-width:.8}.body__lamp--rear{fill:#b3261e}.wheel__tyre{fill:#18191b}.wheel__rim{fill:#2a2c30;stroke:#45484e;stroke-width:2}.wheel__spoke{fill:#0f1012;stroke:#55585f;stroke-width:1}.wheel__hub{fill:#3b3e44}.aero-body,.aero,.wing__blade{transform-box:fill-box;transition:transform var(--aero-ms) var(--ease),opacity var(--aero-ms) var(--ease)}.aero path{fill:#1a1b1e}.aero--wing .wing__strut{fill:#2b2d31}.aero--wing .wing__endplate{fill:#0e0f11}.diffuser__strake{fill:none;stroke:#4a4d53;stroke-width:2}.aero--wing{transform-origin:50% 100%;transform:translateY(92px)}.wing__blade{transform-origin:50% 50%;transform:rotate(0)}.aero--splitter{transform-origin:100% 0%;transform:translate(40px,-12px);opacity:0}.aero--diffuser{transform-origin:0% 0%;transform:translate(-12px,-20px) rotate(0);opacity:0}.aero--dive{transform-origin:100% 50%;transform:scaleX(0);opacity:0}.roadster--track .aero-body{transform:translateY(10px);transition-delay:0ms}.roadster--track .aero--wing{transform:translateY(0);transition-duration:.7s}.roadster--track .wing__blade{transform:rotate(-9deg);transition-duration:.4s;transition-delay:.6s}.roadster--track .aero--splitter{transform:translate(0);opacity:1;transition-delay:.15s;transition-duration:.85s}.roadster--track .aero--diffuser{transform:translate(0) rotate(5deg);opacity:1;transition-delay:.25s;transition-duration:.75s}.roadster--track .aero--dive{transform:scaleX(1) rotate(-5deg);opacity:1;transition-delay:.35s;transition-duration:.65s}.roadster--track .aero--dive-2{transition-delay:.45s;transition-duration:.55s}.streak{fill:none;stroke:var(--road);stroke-width:2;stroke-linecap:round;stroke-dasharray:70 230;opacity:.55;transition:d var(--aero-ms) var(--ease),stroke var(--aero-ms) var(--ease);animation:flow 2.4s linear infinite}.streak--1{animation-delay:-.5s}.streak--2{animation-delay:-1.1s}.streak--3{animation-delay:-1.6s}.streak--4{animation-delay:-.8s}.roadster--track .streak{stroke:var(--track)}.airflow--speed-0 .streak{animation-play-state:paused;opacity:.25}.airflow--speed-1 .streak{animation-duration:2.4s}.airflow--speed-2 .streak{animation-duration:1.4s}.airflow--speed-3 .streak{animation-duration:.8s}@keyframes flow{0%{stroke-dashoffset:300}to{stroke-dashoffset:0}}.controls,.gauge{background:var(--panel);border:1px solid var(--panel-line);border-radius:14px;padding:18px 20px;box-shadow:0 6px 24px #1414181f}.controls{display:flex;flex-direction:column;gap:22px}.toggle{display:flex;align-items:center;gap:14px;flex-wrap:wrap}.toggle__button{display:inline-flex;align-items:center;gap:12px;min-height:48px;padding:10px 14px 10px 18px;font:inherit;font-size:1.05rem;font-weight:600;color:var(--ink);background:#fff;border:2px solid var(--ink);border-radius:999px;cursor:pointer;transition:background-color .2s ease,color .2s ease,border-color .2s ease}.toggle__button:hover{background:#f0f0ee}.toggle__state{min-width:3.2em;padding:4px 10px;border-radius:999px;background:#d6d7d9;color:var(--ink);font-size:.9rem;text-align:center}.toggle__button--on{background:var(--ink);color:#fff;border-color:var(--ink)}.toggle__button--on:hover{background:#2c2e33}.toggle__button--on .toggle__state{background:var(--track);color:#fff}.toggle__hint{margin:0;color:var(--ink-muted)}kbd{display:inline-block;padding:1px 7px;border:1px solid #8b8d92;border-bottom-width:2px;border-radius:5px;background:#fff;font:inherit;font-weight:600;font-size:.9em}:focus-visible{outline:3px solid var(--focus);outline-offset:3px}.speed__row{display:flex;justify-content:space-between;align-items:baseline;gap:12px}.speed label{font-weight:600}.speed__output{font-variant-numeric:tabular-nums;font-size:1.25rem;font-weight:600}.speed input[type=range]{width:100%;margin:10px 0 4px;accent-color:var(--ink);min-height:28px}.speed__scale{display:flex;justify-content:space-between;font-size:.8rem;color:var(--ink-muted)}.aero-list{display:grid;grid-template-columns:auto 1fr;gap:8px 16px;margin:0;padding-top:16px;border-top:1px solid var(--panel-line)}.aero-list__row{display:contents}.aero-list dt{font-weight:600}.aero-list dd{margin:0;color:var(--ink-2)}.aero-list__state{display:inline-block;min-width:5.5em;margin-right:8px;padding:1px 8px;border-radius:999px;border:1px solid #8b8d92;font-size:.82rem;font-weight:600;text-align:center;color:var(--ink);background:#fff}.aero-list__state--on{border-color:var(--track);background:#fbe9e2;color:#8a2b0c}.gauge__head{display:flex;align-items:baseline;justify-content:space-between;gap:10px;flex-wrap:wrap}.gauge h2{margin:0;font-size:1.1rem}.disclaimer{margin:0;padding:2px 10px;border:1px solid #8b8d92;border-radius:999px;font-size:.82rem;font-weight:600;color:var(--ink-2);background:#fff}.gauge__body{display:flex;align-items:center;gap:16px;margin-top:8px}.dial{flex:0 0 auto;width:200px;max-width:48%;height:auto}.dial__track{fill:none;stroke:#d4d5d7;stroke-width:12;stroke-linecap:round}.dial__value{fill:none;stroke-width:12;stroke-linecap:round}.dial__value--road{stroke:var(--road)}.dial__value--track{stroke:var(--track)}.dial__tick line{stroke:var(--ink-muted);stroke-width:2}.dial__tick text,.dial__unit{fill:var(--ink-2);font-size:12px;text-anchor:middle}.dial__needle path{fill:var(--ink)}.dial__cap{fill:var(--ink)}.readout__value{margin:0;font-size:clamp(1.6rem,4vw,2.2rem);font-weight:700;font-variant-numeric:tabular-nums}.readout__sub{margin:4px 0 0;color:var(--ink-2);font-variant-numeric:tabular-nums}.curves{margin:12px 0 0}.curves svg{display:block;width:100%;max-width:420px;height:auto}.curves__grid line{stroke:#17181a1f;stroke-width:1}.curves__ylabel,.curves__xlabel,.curves__axis{fill:var(--ink-muted);font-size:10px}.curves__ylabel{text-anchor:end}.curves__xlabel{text-anchor:middle}.curves__axis{text-anchor:end}.curve{fill:none;stroke-width:2;stroke-linejoin:round;opacity:.45;stroke-dasharray:4 4}.curve--road{stroke:var(--road)}.curve--track{stroke:var(--track)}.curve--active{stroke-width:3;opacity:1;stroke-dasharray:none}.curves__label{fill:var(--ink-muted);font-size:11px}.curves__label--active{fill:var(--ink);font-weight:700}.curves__guide{stroke:var(--ink-muted);stroke-width:1;stroke-dasharray:2 3}.curves__marker{stroke:#fff;stroke-width:2}.curves__marker--road{fill:var(--road)}.curves__marker--track{fill:var(--track)}.curves figcaption{margin-top:6px;font-size:.82rem;color:var(--ink-muted)}.app__footer{margin-top:24px;font-size:.85rem;color:var(--ink-2);text-align:center}.app__footer a{color:#0b3f8a}@media(max-width:760px){.app{padding:16px 12px 24px}.app__main{grid-template-columns:minmax(0,1fr)}.controls,.gauge{padding:14px}}@media(prefers-reduced-motion:reduce){:root{--aero-ms: 1ms}.streak{animation:none}.aero-body,.aero,.wing__blade,.streak,.toggle__button{transition-duration:1ms!important;transition-delay:0ms!important}}