:root{--paper:#f5f7fa;--board:#fff;--ink:#18212f;--graphite:#5b6675;--rule:#dce2ea;--pencil:#2e5bba;--highlighter:#ffe873;--wrong:#d93b4c;--sans:"IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--mono:"IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace}*{box-sizing:border-box}html{scroll-padding-top:72px}@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}body{background:var(--paper);color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased;margin:0;font-size:17px;line-height:1.6}h1,h2,h3{letter-spacing:-.015em;margin:0;font-weight:600;line-height:1.2}a{color:var(--pencil);text-underline-offset:3px}code{font-family:var(--mono);color:var(--ink);font-size:.86em}:focus-visible{outline:2px solid var(--pencil);outline-offset:2px}.page{max-width:880px;margin:0 auto;padding:0 20px}main>.page+.page{margin-top:80px}.topbar{z-index:10;-webkit-backdrop-filter:blur(4px)saturate(160%);backdrop-filter:blur(4px)saturate(160%);background:#f5f7fab8;border-bottom:1px solid #dce2eacc;position:sticky;top:0}.topbar__inner{align-items:center;gap:24px;max-width:880px;height:52px;margin:0 auto;padding:0 20px;display:flex}.topbar__title{color:var(--ink);flex-shrink:0;font-weight:600;text-decoration:none}.topbar__nav{scrollbar-width:none;align-self:stretch;align-items:center;gap:22px;margin-left:auto;display:flex;overflow-x:auto}.topbar__nav::-webkit-scrollbar{display:none}.topbar__nav a{color:var(--graphite);flex-shrink:0;font-size:15px;line-height:1;text-decoration:none}.topbar__nav a:hover{color:var(--ink)}.hero{padding-top:48px}.hero h1{letter-spacing:-.025em;font-size:clamp(36px,7vw,48px)}.lead{max-width:34em;color:var(--graphite);margin:12px 0 0;font-size:19px;line-height:1.5}.sections__head{border-bottom:1px solid var(--ink);padding-bottom:12px;font-size:24px}.section{border-bottom:1px solid var(--rule)}.section summary{cursor:pointer;flex-direction:column;gap:2px;padding:18px 40px 18px 0;list-style:none;display:flex;position:relative}.section summary::-webkit-details-marker{display:none}.section summary:after{content:"+";color:var(--graphite);font-size:24px;font-weight:400;line-height:1;position:absolute;top:50%;right:4px;transform:translateY(-50%)}.section[open] summary:after{content:"−"}.section summary:hover .section__title{color:var(--pencil)}.section__title{font-size:19px;font-weight:600}.section__hint{color:var(--graphite);font-size:15px}.section__body{padding:4px 0 36px}.section__body>p,.section__body>ol,.defs--stacked dd{max-width:40em}.section__body>p{margin:0 0 20px}.figure{margin:32px 0 0}.toolbar{align-items:center;min-height:56px;margin-bottom:4px;display:flex}.toolbar__idle{justify-content:space-between;align-items:center;gap:16px;width:100%;display:flex}.toolbar__idle[hidden],.toolbar__round[hidden]{display:none}.toolbar__mode{flex-direction:column;margin:0;font-size:15px;line-height:1.4;display:flex}.toolbar__mode span{color:var(--graphite)}.toolbar__round{flex-wrap:wrap;gap:8px 32px;width:100%;margin:0;display:flex}.readout dt{color:var(--graphite);font-size:13px}.readout dd{font-variant-numeric:tabular-nums;align-items:center;gap:6px;margin:0;font-size:20px;font-weight:600;display:flex}.readout--target{border-radius:4px;margin-left:-8px;padding:0 8px}.readout dd.is-urgent{color:var(--wrong)}.readout__icon{display:flex}.shape-icon{width:20px;height:20px;fill:var(--highlighter);stroke:var(--ink);stroke-width:1.5px;stroke-linejoin:round}#app{aspect-ratio:4/3;-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent;width:min(100%,600px,max(280px,133.333svh - 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