.bg{--bg-brand-raw: var(--accent-color, var(--ota-brand, #ed0000));--bg-paper: var(--secondary-background, rgb(var(--color-background, 247 248 249)));--bg-ink: var(--text-color, rgb(var(--color-foreground, 20 24 29)));--bg-heading: var(--heading-color, var(--bg-ink));--bg-card: color-mix(in srgb, var(--bg-paper) 94%, var(--bg-ink) 6%);--bg-sunken: color-mix(in srgb, var(--bg-paper) 88%, var(--bg-ink) 12%);--bg-rule: color-mix(in srgb, var(--bg-ink) 22%, transparent);--bg-ink-soft: color-mix(in srgb, var(--bg-ink) 68%, transparent);--bg-brand: var(--bg-brand-raw);--bg-accent: color-mix(in srgb, #b5701c 82%, var(--bg-ink) 18%);--bg-ok: color-mix(in srgb, #3d9068 78%, var(--bg-ink) 22%);--bg-warn-bg: color-mix(in srgb, var(--bg-accent) 12%, var(--bg-paper));--bg-metal: color-mix(in srgb, var(--bg-paper) 82%, var(--bg-ink) 18%);--bg-metal-lo: color-mix(in srgb, var(--bg-paper) 68%, var(--bg-ink) 32%);--bg-body: color-mix(in srgb, var(--bg-paper) 40%, var(--bg-ink) 60%);--bg-outline: color-mix(in srgb, var(--bg-ink) 45%, transparent);--bg-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;--bg-sans: var(--text-font-family, var(--font-body-family, "IBM Plex Sans", system-ui, sans-serif));--bg-head: var(--heading-font-family, var(--font-heading-family, var(--bg-sans)));background:var(--bg-paper);color:var(--bg-ink);font-family:var(--bg-sans);line-height:1.6;padding:2.5rem 1.25rem 4rem}@supports not (color: color-mix(in srgb,red 50%,transparent)){.bg{--bg-paper:#f7f8f9;--bg-ink:#14181d;--bg-heading:#14181d;--bg-card:#fff;--bg-sunken:#eef1f3;--bg-rule:#d4dae0;--bg-ink-soft:#5c6672;--bg-brand:#c30505;--bg-accent:#c77b26;--bg-ok:#2f6b4f;--bg-warn-bg:#fdf6ec;--bg-metal:#e8edf1;--bg-metal-lo:#c9d2d9;--bg-body:#3d556e;--bg-outline:#8fa0b0}}.bg__head{max-width:46rem;margin:0 auto 3rem}.bg__eyebrow{font-family:var(--bg-mono);font-size:.7rem;letter-spacing:.18em;text-transform:uppercase;color:var(--bg-ink-soft);margin:0 0 .6rem}.bg__title{color:var(--bg-heading);font-family:var(--bg-head);font-size:clamp(1.9rem,5vw,3rem);font-weight:600;letter-spacing:-.025em;line-height:1.08;margin:0 0 1rem}.bg__standfirst{font-size:clamp(1rem,2.2vw,1.15rem);color:var(--bg-ink-soft);max-width:42ch;margin:0}.bg__section{max-width:46rem;margin:0 auto;padding:2.5rem 0;border-top:1px solid var(--bg-rule)}.bg__section--tint{max-width:none;background:var(--bg-sunken);border-top:1px solid var(--bg-rule);border-bottom:1px solid var(--bg-rule);padding:2.5rem 1.25rem;margin:0 -1.25rem}.bg__section--tint>*{max-width:46rem;margin-left:auto;margin-right:auto}.bg__h2{font-size:clamp(1.15rem,2.6vw,1.4rem);font-weight:600;letter-spacing:-.01em;margin:0 0 1rem;display:flex;gap:.85rem;align-items:baseline}.bg__num{font-family:var(--bg-mono);font-size:.75rem;font-weight:400;color:var(--bg-accent);letter-spacing:.08em}.bg__lede{color:var(--bg-ink-soft);margin:0 0 1.5rem}.bg p{margin:0 0 1rem}.bg code{font-family:var(--bg-mono);font-size:.85em;background:var(--bg-sunken);padding:.1em .35em;border-radius:2px}.bg__demo{margin:0 0 1.5rem;background:var(--bg-card);border:1px solid var(--bg-rule);border-radius:3px;overflow:hidden}.bg__demo-stage{padding:1.4rem 1.25rem .5rem}.bg__svg{display:block;width:100%;height:auto}.bg__svg-lab{font-family:var(--bg-mono);font-size:11px;letter-spacing:.1em;fill:var(--bg-ink-soft)}.bg__demo-track{fill:var(--bg-sunken)}.bg__demo-motor{fill:var(--bg-ink)}.bg__demo-tube{fill:var(--bg-ink);transition:fill .14s}.bg__demo-dot{transition:transform .13s ease-out}[data-state=dead] .bg__demo-tube{fill:var(--bg-accent)}[data-state=live] .bg__demo-tube{fill:var(--bg-ok)}.bg__demo-gap{display:none}[data-state=dead] .bg__demo-gap{display:block}.bg__demo-gap-line{stroke:var(--bg-accent);stroke-width:2;stroke-dasharray:3 3}.bg__demo-gap-label{font-family:var(--bg-mono);font-size:11px;fill:var(--bg-accent)}.bg__demo-controls{border-top:1px solid var(--bg-rule);background:var(--bg-paper);padding:1.1rem 1.25rem 1.25rem}.bg__demo-hint{font-size:.78rem;color:var(--bg-ink-soft);margin:0 0 .7rem}.bg__btnrow{display:flex;flex-wrap:wrap;gap:.5rem}.bg__btn{flex:1 1 auto;min-width:6rem;min-height:44px;font-family:var(--bg-mono);font-size:.82rem;letter-spacing:.04em;color:var(--bg-ink);background:var(--bg-card);border:1px solid var(--bg-rule);border-radius:2px;cursor:pointer;padding:0 .6rem}.bg__btn:hover{border-color:var(--bg-brand)}.bg__btn:focus-visible{outline:2px solid var(--bg-brand);outline-offset:1px}.bg__btn--ghost{flex:0 1 auto;color:var(--bg-ink-soft)}.bg__demo-say{font-size:.9rem;color:var(--bg-ink);border-left:2px solid var(--bg-rule);padding-left:.8rem;margin:1rem 0 0;min-height:2.6em;display:flex;align-items:center}[data-state=dead] .bg__demo-say{border-left-color:var(--bg-accent)}[data-state=live] .bg__demo-say{border-left-color:var(--bg-ok)}.bg__callout{border-left:3px solid var(--bg-accent);background:var(--bg-warn-bg);padding:.9rem 1rem;font-size:.9rem;margin:0}.bg__method{font-size:1.02rem;font-weight:600;margin:1.9rem 0 .5rem}.bg__method:first-of-type{margin-top:.5rem}.bg__more{margin:.5rem 0 0;border:1px solid var(--bg-rule);border-radius:3px;background:var(--bg-card)}.bg__more>summary{cursor:pointer;list-style:none;font-family:var(--bg-mono);font-size:.76rem;letter-spacing:.04em;color:var(--bg-ink);padding:.85rem 1rem;min-height:44px;display:flex;align-items:center;justify-content:space-between;gap:1rem}.bg__more>summary::-webkit-details-marker{display:none}.bg__more>summary:after{content:"+";font-family:var(--bg-mono);color:var(--bg-accent);font-size:1rem}.bg__more[open]>summary:after{content:"\2013"}.bg__more>summary:focus-visible{outline:2px solid var(--bg-brand);outline-offset:-2px}.bg__more-body{padding:.25rem 1rem .5rem;border-top:1px solid var(--bg-rule)}.bg__steps{list-style:none;counter-reset:s;margin:0;padding:0}.bg__step{counter-increment:s;padding:1.1rem 0;border-top:1px solid var(--bg-rule)}.bg__step:first-child{border-top:0}.bg__step h3{font-size:.95rem;font-weight:600;margin:0 0 .35rem;display:flex;gap:.6rem;align-items:baseline}.bg__step h3:before{content:counter(s,decimal-leading-zero);font-family:var(--bg-mono);font-size:.72rem;font-weight:400;color:var(--bg-accent)}.bg__step p{font-size:.88rem;color:var(--bg-ink-soft);margin:0}.bg__notes{list-style:none;margin:0;padding:0}.bg__notes li{font-size:.9rem;color:var(--bg-ink-soft);padding:.85rem 0 .85rem 1.1rem;border-top:1px solid var(--bg-rule);position:relative}.bg__notes li:first-child{border-top:0}.bg__notes li:before{content:"";position:absolute;left:0;top:1.35rem;width:5px;height:5px;border-radius:50%;background:var(--bg-accent)}.bg__notes strong{color:var(--bg-ink);font-weight:600}.bg__back{max-width:46rem;margin:2.5rem auto 0}.bg__back a{color:var(--bg-brand);text-decoration:none;font-weight:500}.bg__back a:hover{text-decoration:underline}@media(prefers-reduced-motion:reduce){.bg__demo-dot,.bg__demo-tube{transition:none}}
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