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a:hover{color:var(--truth);border-bottom-color:var(--truth)}.optim__table{margin-top:var(--s-4);min-width:34rem}.optim__tname{text-align:left;color:var(--fg);font-weight:600}.optim__tend{text-align:left;color:var(--fg-faint);white-space:nowrap}.optline{fill:none;stroke-width:2px;stroke-linejoin:round;stroke-linecap:round}.optline__halo{fill:none;stroke:var(--walker-halo);stroke-width:4.5px;stroke-linejoin:round;stroke-linecap:round}.optline--s0{stroke:var(--fg);stroke-width:1.7px;stroke-dasharray:5 4}.optline--s1{stroke:var(--opt-1)}.optline--s2{stroke:var(--opt-2)}.optline--s3{stroke:var(--opt-3)}.optline--s4{stroke:var(--opt-4)}.optline--s5{stroke:var(--opt-5)}.optdot{stroke:var(--walker-halo);stroke-width:2px}.optdot--s0{fill:var(--fg)}.optdot--s1{fill:var(--opt-1)}.optdot--s2{fill:var(--opt-2)}.optdot--s3{fill:var(--opt-3)}.optdot--s4{fill:var(--opt-4)}.optdot--s5{fill:var(--opt-5)}.optlabel{paint-order:stroke;stroke:var(--walker-halo);stroke-width:3.5px;stroke-linejoin:round;font-size:10px;font-weight:600}.optlabel--s0{fill:var(--fg)}.optlabel--s1{fill:var(--opt-1)}.optlabel--s2{fill:var(--opt-2)}.optlabel--s3{fill:var(--opt-3)}.optlabel--s4{fill:var(--opt-4)}.optlabel--s5{fill:var(--opt-5)}.optnow{stroke:var(--fg-faint);stroke-width:1px;stroke-dasharray:2 4;opacity:.6}.optswatch--s0,.optswatch--s1,.optswatch--s2,.optswatch--s3,.optswatch--s4,.optswatch--s5{border-radius:2px;flex:none;width:14px;height:3px;display:inline-block}.optswatch--s0{background:repeating-linear-gradient(90deg, var(--fg) 0 4px, transparent 4px 7px)}.optswatch--s1{background:var(--opt-1)}.optswatch--s2{background:var(--opt-2)}.optswatch--s3{background:var(--opt-3)}.optswatch--s4{background:var(--opt-4)}.optswatch--s5{background:var(--opt-5)}.rules{flex-direction:column;margin:0;padding:0;list-style:none;display:flex}.rule{padding:var(--s-5) 0;border-bottom:1px solid color-mix(in srgb, var(--line) 55%, transparent)}.rule:last-child{border-bottom:none;padding-bottom:0}.rule__head{align-items:baseline;gap:var(--s-3);letter-spacing:-.01em;flex-wrap:wrap;margin:0;font-size:1.15rem;font-weight:600;display:flex}.rule__n{border:1px solid var(--line-strong);width:1.7rem;height:1.7rem;color:var(--fg-dim);font-size:var(--t-data-sm);border-radius:50%;flex:none;align-self:center;place-items:center;font-weight:400;line-height:1;display:grid}.rule__short,.rule__year{font-size:var(--t-data-sm);color:var(--fg-faint);font-weight:400}.rule__year{margin-left:auto}.rule__math{margin:var(--s-4) 0 0;overflow:auto hidden}.rule__where{margin:var(--s-3) 0 0;font-size:var(--t-data-sm);color:var(--fg-dim);text-align:center;text-wrap:pretty;line-height:1.55}.rule__refs{margin-top:var(--s-4)}.plainlist{gap:var(--s-5);margin-top:var(--s-5);grid-template-columns:repeat(auto-fit,minmax(22rem,1fr));display:grid}.plainc{padding-left:var(--s-4);border-left:2px solid var(--line-strong)}.plainc__head{align-items:baseline;gap:var(--s-3);display:flex}.plainc__swatch{align-self:center}.plainc__n{font-size:var(--t-data-sm);color:var(--fg-faint)}.plainc__name{margin:0;font-size:1.05rem;font-weight:600}.plainc__body{margin:var(--s-3) 0 0;font-size:var(--t-data);color:var(--fg-dim);text-wrap:pretty;line-height:1.65}.ocard__refs{gap:var(--s-3);margin-top:var(--s-4);padding-top:var(--s-3);border-top:1px solid color-mix(in srgb, var(--line) 55%, transparent);flex-direction:column;display:flex}.ref{gap:.1em var(--s-4);font-size:var(--t-data-sm);grid-template-columns:minmax(9rem,auto) minmax(0,1fr);margin:0;line-height:1.5;display:grid}.ref__meta{color:var(--fg-faint);grid-row:span 2}.ref__title{color:var(--fg);border-bottom:1px solid var(--line-strong);text-wrap:pretty;justify-self:start;text-decoration:none}.ref__title:hover{color:var(--truth);border-bottom-color:var(--truth)}.ref__where{color:var(--fg-faint);text-wrap:pretty}@media (width<=620px){.ref{grid-template-columns:1fr}.ref__meta{grid-row:auto}}.steps{--t-body:clamp(.95rem, .95vw, 1.02rem);--t-data:clamp(.82rem, .88vw, .94rem);--t-data-sm:clamp(.75rem, .8vw, .86rem);--t-label:clamp(.6rem, .66vw, .7rem);min-height:100%;padding-bottom:5rem}.steps__top{z-index:10;background:color-mix(in srgb, var(--bg) 90%, transparent);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);position:sticky;top:0}.steps__top-in{max-width:84rem;padding:var(--s-3) var(--s-5);justify-content:space-between;align-items:center;gap:var(--s-4);flex-wrap:wrap;margin:0 auto;display:flex}.steps__brand{color:var(--fg-faint);margin:0}.steps__tabs{align-items:center;gap:var(--s-2);display:flex}.steps__tab{font-size:var(--t-data-sm);color:var(--fg-dim);border-radius:var(--radius);transition:color .12s var(--ease), background .12s var(--ease), border-color .12s var(--ease);border:1px solid #0000;align-items:baseline;gap:.5em;padding:.4em .75em;display:inline-flex}.steps__tab .mono{color:var(--fg-faint)}.steps__tab:hover{background:var(--surface-2);color:var(--fg)}.steps__tab.is-on{color:var(--fg);background:var(--surface-2);border-color:var(--line-strong)}.steps__tab.is-on .mono{color:var(--truth)}.steps__dl{margin-left:var(--s-4);padding-left:var(--s-4);border-left:1px solid var(--line);font-family:var(--font-display);font-weight:700;font-stretch:125%;font-size:var(--t-label);letter-spacing:.14em;text-transform:uppercase;color:var(--fg-faint);white-space:nowrap;text-decoration:none}.steps__dl:hover{color:var(--truth)}.coda{max-width:84rem;margin:var(--s-6) auto 0;padding:var(--s-6) var(--s-5) 0;border-top:1px solid var(--line)}.coda__head{color:var(--fg-faint);margin:0 0 var(--s-5)}.coda__grid{gap:var(--s-6);grid-template-columns:minmax(0,1fr) minmax(0,1fr);align-items:start;display:grid}.coda__cell{gap:var(--s-3);flex-direction:column;min-width:0;display:flex}.coda__n{color:var(--fg-dim);padding-bottom:var(--s-2);border-bottom:1px solid var(--line);margin:0}.coda__say{font-size:var(--t-data-sm);color:var(--fg-dim);text-wrap:pretty;max-width:62ch;margin:0;line-height:1.6}.coda .widget{gap:var(--s-3)}.coda__night{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:var(--s-4);color:var(--fg)}@media (width<=940px){.coda__grid{grid-template-columns:minmax(0,1fr)}}.steps__grid{max-width:84rem;padding:var(--s-5);gap:var(--s-6);grid-template-columns:minmax(0,26rem) minmax(0,1fr);align-items:start;margin:0 auto;display:grid}.steps__left{gap:var(--s-4);scrollbar-width:thin;flex-direction:column;max-height:calc(100vh - 5rem);padding-right:2px;display:flex;position:sticky;top:4rem;overflow-y:auto}.steps__right{gap:var(--s-4);flex-direction:column;min-width:0;display:flex}@media (width<=940px){.steps__grid{grid-template-columns:1fr}.steps__left{max-height:none;position:static;overflow-y:visible}}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:var(--s-4)}.card__label{color:var(--fg-faint);margin:0 0 var(--s-3)}.card__model{margin:0;font-size:1.15em}.card__model--alt{margin-top:var(--s-2);color:var(--fg-dim);font-size:1em}.card--wide{padding:var(--s-5)}.card__say{margin:var(--s-3) 0 0;font-size:var(--t-data-sm);color:var(--fg-dim);text-wrap:pretty;line-height:1.5}.card__target{margin:var(--s-3) 0 0;padding-top:var(--s-3);border-top:1px solid var(--line);font-size:var(--t-data-sm);color:var(--fg-faint)}.card__target .mono{color:var(--truth)}.nums{gap:var(--s-5);flex-wrap:wrap;display:flex}.num{flex-direction:column;gap:.3em;display:flex}.num .legend{color:var(--fg-faint)}.num__v{font-size:1.5rem;font-weight:500;line-height:1}.steps__controls{align-items:center;gap:var(--s-4);padding:var(--s-4);background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);flex-wrap:wrap;display:flex}.bigbtn{font-family:var(--font-display);font-weight:600;font-stretch:110%;font-size:var(--t-data);letter-spacing:.06em;color:var(--bg);background:var(--truth);border-radius:var(--radius);transition:filter .12s var(--ease), transform 60ms var(--ease);align-items:center;gap:.7em;padding:.7em 1.2em;line-height:1;display:inline-flex}.bigbtn:hover:not(:disabled){filter:brightness(1.1)}.bigbtn:active:not(:disabled){transform:translateY(1px)}.bigbtn:disabled{opacity:.45;cursor:not-allowed}.bigbtn__arrow{font-size:1.1em}.minibtn{font-size:var(--t-data-sm);color:var(--fg-faint);border-bottom:1px solid #0000}.minibtn:hover:not(:disabled){color:var(--fg);border-bottom-color:var(--line-strong)}.minibtn:disabled{opacity:.4;cursor:not-allowed}.rates{align-items:center;gap:var(--s-2);flex-wrap:wrap;display:flex}.rates .legend{color:var(--fg-faint);margin-right:var(--s-1)}.ratebtn{font-size:var(--t-data-sm);color:var(--fg-dim);background:var(--surface-2);border-radius:var(--radius);border:1px solid #0000;flex-direction:column;align-items:flex-start;gap:.15em;padding:.35em .6em;line-height:1.1;display:flex}.ratebtn:hover{color:var(--fg);background:var(--surface-3)}.ratebtn.is-on{color:var(--fg);border-color:var(--truth);background:var(--surface-3)}.ratebtn__note{color:var(--fg-faint);white-space:nowrap;font-size:.78em}.toggle{align-items:center;gap:var(--s-2);font-size:var(--t-data-sm);color:var(--fg-dim);cursor:pointer;display:inline-flex}.toggle input{accent-color:var(--truth);width:15px;height:15px}.strip{align-items:center;gap:var(--s-3);flex-wrap:wrap;display:flex}.strip__label{color:var(--fg-faint);flex:none}.strip__items{flex-wrap:wrap;gap:3px;display:flex}.strip__btn{min-width:2rem;font-size:var(--t-data-sm);color:var(--fg-faint);background:var(--surface-2);border-radius:var(--radius);transition:color .1s var(--ease), background .1s var(--ease);border:1px solid #0000;padding:.3em .4em;line-height:1}.strip__btn:hover{color:var(--fg);background:var(--surface-3)}.strip__gap{color:var(--fg-faint);align-self:center;padding:0 .2em}.strip__btn.is-on{color:var(--bg);background:var(--walker);border-color:var(--walker)}.stepcard{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:var(--s-5)}.stepcard__head{padding-bottom:var(--s-4);border-bottom:1px solid var(--line);margin-bottom:var(--s-2)}.stepcard__title{letter-spacing:-.01em;margin:0;font-size:1.5rem;font-weight:600}.stepcard__title .mono{color:var(--truth)}.stepcard__sub{margin:var(--s-2) 0 0;font-size:var(--t-data-sm);color:var(--fg-dim)}.smath{flex-direction:column;display:flex}.sblock{padding:var(--s-5) 0;border-bottom:1px solid color-mix(in srgb, var(--line) 55%, transparent)}.sblock:last-child{border-bottom:none;padding-bottom:0}.sblock__head{align-items:flex-start;gap:var(--s-3);display:flex}.sblock__n{border:1px solid var(--line-strong);width:1.7rem;height:1.7rem;color:var(--fg-dim);font-size:var(--t-data-sm);border-radius:50%;flex:none;place-items:center;line-height:1;display:grid}.sblock__title{margin:0;font-size:1.05rem;font-weight:600;line-height:1.25}.sblock__says{margin:var(--s-2) 0 0;font-size:var(--t-data-sm);color:var(--fg-dim);text-wrap:pretty;max-width:62ch;line-height:1.55}.sblock__body{margin-top:var(--s-4);padding-left:calc(1.7rem + var(--s-3))}@media (width<=620px){.sblock__body{padding-left:0}}.sblock__body .math-block{padding:var(--s-2) 0;overflow:auto hidden}.smath__aside{margin:var(--s-3) 0 0;font-size:var(--t-data-sm);color:var(--fg-faint);text-wrap:pretty;max-width:62ch;line-height:1.55}.shapes{align-items:baseline;gap:var(--s-2);margin-top:var(--s-4);padding:var(--s-3) var(--s-4);background:var(--surface-2);border-radius:var(--radius);font-size:var(--t-data-sm);flex-wrap:wrap;display:flex}.shapes__pair{color:var(--fg-dim)}.shapes__inner{color:var(--truth)}.shapes__dot,.shapes__eq{color:var(--fg-faint)}.shapes__out{color:var(--fg)}.shapes__note{color:var(--fg-faint);flex:16rem;line-height:1.45}.condrow{justify-content:space-between;align-items:baseline;gap:var(--s-3);border-bottom:1px solid color-mix(in srgb, var(--line) 45%, transparent);padding:.3em 0;display:flex}.condrow .legend{color:var(--fg-faint)}.condrow__v{font-size:var(--t-data);color:var(--fg)}.condrow__v.is-bad{color:var(--danger)}.condrow__v.is-good{color:var(--truth)}.xdiag__jdot{fill:var(--fg-faint)}.atonce{margin-top:var(--s-5);padding:var(--s-4) 0 0;border-top:1px dashed var(--line-strong)}.atonce__label{color:var(--truth);margin:0 0 var(--s-3)}.stable-wrap{overflow-x:auto}.stable{border-collapse:collapse;font-size:var(--t-data-sm);min-width:24rem}.stable--fit{width:100%;min-width:0}.stable th{font-family:var(--font-display);font-weight:600;font-stretch:125%;font-size:var(--t-label);letter-spacing:.14em;text-transform:uppercase;color:var(--fg-faint);text-align:right;padding:0 0 var(--s-2) var(--s-5);border-bottom:1px solid var(--line)}.stable td{text-align:right;padding:.35em 0 .35em var(--s-5);color:var(--fg-dim);border-bottom:1px solid color-mix(in srgb, var(--line) 45%, transparent);white-space:nowrap}.stable th:first-child,.stable td:first-child{padding-left:0}.stable td.is-under{color:var(--danger)}.stable td.is-over{color:var(--slope)}.stable__key{margin:var(--s-3) 0 0;font-size:var(--t-data-sm);color:var(--fg-faint)}.notice{padding:var(--s-4);border-left:2px solid var(--slope);background:var(--surface);font-size:var(--t-data-sm);color:var(--fg-dim);text-wrap:pretty;margin:0;line-height:1.6}.notice .mono{color:var(--fg)}.xcard{background:var(--surface);border:1px solid var(--line);border-left:2px solid var(--terr-2);border-radius:var(--radius)}.xcard__head{justify-content:space-between;align-items:center;gap:var(--s-3);padding:var(--s-4);cursor:pointer;-webkit-user-select:none;user-select:none;list-style:none;display:flex}.xcard__head::-webkit-details-marker{display:none}.xcard__head .legend{color:var(--fg-dim)}.xcard:hover .xcard__head .legend{color:var(--fg)}.xcard__mark{flex:none;width:11px;height:11px;position:relative}.xcard__mark:before,.xcard__mark:after{content:"";background:var(--fg-faint);transition:transform .14s var(--ease);position:absolute}.xcard__mark:before{width:11px;height:1.5px;top:5px;left:0}.xcard__mark:after{width:1.5px;height:11px;top:0;left:5px}.xcard[open] .xcard__mark:after{transform:scaleY(0)}.xcard__body{padding:0 var(--s-4) var(--s-4)}.xcard__p{margin:0 0 var(--s-3);font-size:var(--t-data-sm);color:var(--fg-dim);text-wrap:pretty;line-height:1.55}.xcard__p:last-child{margin-bottom:0}.xcard__p strong{color:var(--fg);font-weight:600}.xcard__eg{margin:0 0 var(--s-3);padding:var(--s-3);background:var(--surface-2);border-radius:var(--radius);font-size:var(--t-data);color:var(--fg-dim);text-align:center}.xcard__eg strong{color:var(--danger);font-weight:500}.xcard__note{margin:var(--s-4) 0 0;padding-top:var(--s-3);border-top:1px solid var(--line);font-size:var(--t-data-sm);color:var(--fg-faint);text-wrap:pretty;line-height:1.55}.xcard__step{align-items:baseline;gap:var(--s-2);margin:var(--s-4) 0 var(--s-2);font-size:var(--t-data-sm);color:var(--fg);text-wrap:pretty;line-height:1.5;display:flex}.xcard__step:first-child{margin-top:0}.xcard__stepn{background:var(--surface-3);width:1.15rem;height:1.15rem;color:var(--fg-dim);border-radius:50%;flex:none;place-items:center;font-size:.68rem;line-height:1;display:grid}.xcard__body .math-block{margin:var(--s-2) 0 var(--s-3);font-size:.94em;overflow:auto hidden}.xdiag{width:100%;max-width:17rem;height:auto;margin:0 auto var(--s-3);display:block}.xdiag__axis{fill:none;stroke:var(--line-strong);stroke-width:1px}.xdiag__line{stroke:var(--walker);stroke-width:2px;stroke-linecap:round}.xdiag__gap{stroke:var(--danger);stroke-width:1.75px;stroke-dasharray:2.5 2.5}.xdiag__actual{fill:var(--data-pt);stroke:var(--surface);stroke-width:1.5px}.xdiag__pred{fill:var(--walker)}.xdiag__t{font-family:var(--font-display);letter-spacing:.1em;text-transform:uppercase;fill:var(--fg-dim);font-size:8.5px;font-weight:600;font-stretch:125%}.xdiag__t--err{fill:var(--danger)}.xdiag__t--dim{fill:var(--fg-faint)}