.ba-article{padding-top:clamp(4rem,7vw,7rem)}.ba-head{max-width:64rem;animation:.8s cubic-bezier(.16,1,.3,1) .2s both ba-rise}@keyframes ba-rise{0%{opacity:0;transform:translateY(60px)}to{opacity:1;transform:none}}.ba-title{max-width:24ch;margin-top:1.75rem;font-size:clamp(2.5rem,4.6vw,4.4rem)}.ba-author{color:var(--muted-foreground);margin-top:1.4rem;font-size:.95rem;font-weight:600}.ba-cover{aspect-ratio:1200/630;border:1px solid color-mix(in oklab,var(--foreground)15%,transparent);margin-top:clamp(2.5rem,4vw,3.5rem);position:relative;overflow:hidden}.ba-cover img{object-fit:cover}.ba-layout{grid-template-columns:minmax(0,46rem) minmax(0,18rem);justify-content:space-between;align-items:start;gap:clamp(3rem,6vw,6rem);margin-top:clamp(3rem,5vw,4.5rem);display:grid}.ba-aside{gap:2.5rem;display:grid;position:sticky;top:6.5rem}.ba-meta{border-bottom:1px solid color-mix(in oklab,var(--foreground)12%,transparent);flex-wrap:wrap;align-items:center;gap:.75rem 1.25rem;padding-bottom:1.5rem;display:flex}.ba-topic{border:1px solid color-mix(in oklab,var(--primary)55%,transparent);background:color-mix(in oklab,var(--primary)12%,transparent);color:var(--primary);letter-spacing:.12em;text-transform:uppercase;padding:.45rem .75rem;font-size:.68rem;font-weight:800}.ba-read{color:var(--muted-foreground);align-items:center;gap:.55rem;font-size:.85rem;font-weight:600;display:inline-flex}.ba-read:before{background:var(--primary);content:"";width:6px;height:6px}.ba-aside-title{color:color-mix(in oklab,var(--foreground)55%,transparent);letter-spacing:.16em;text-transform:uppercase;margin-bottom:1rem;font-size:.68rem;font-weight:800}.ba-toc ol{gap:.15rem;display:grid}.ba-toc a{border-left:2px solid color-mix(in oklab,var(--foreground)10%,transparent);color:color-mix(in oklab,var(--foreground)60%,transparent);padding:.55rem .9rem;font-size:.88rem;font-weight:600;line-height:1.4;transition:color .18s,border-color .18s,background-color .18s;display:block}.ba-toc a:hover{color:var(--foreground)}.ba-toc a[aria-current=location]{border-left-color:var(--primary);background:color-mix(in oklab,var(--primary)12%,transparent);color:var(--foreground);font-weight:700}.ba-share-buttons{flex-wrap:wrap;gap:.5rem;display:flex}.ba-share-buttons button{border:1px solid color-mix(in oklab,var(--foreground)15%,transparent);background:color-mix(in oklab,var(--foreground)2.5%,transparent);width:2.6rem;height:2.6rem;color:color-mix(in oklab,var(--foreground)80%,transparent);place-items:center;font-size:.9rem;font-weight:800;transition:border-color .18s,background-color .18s,color .18s;display:grid}.ba-share-buttons button:hover{border-color:color-mix(in oklab,var(--foreground)40%,transparent);background:color-mix(in oklab,var(--foreground)6%,transparent);color:var(--foreground)}.ba-share-buttons button[data-copied]{border-color:var(--primary);background:var(--primary);color:#fff}.ba-share-in{font-family:Georgia,Times New Roman,serif;font-style:italic}.ba-share-f{font-family:Georgia,Times New Roman,serif}.ba-share-status{min-height:1.2em;color:var(--primary);margin-top:.6rem;font-size:.78rem;font-weight:700}.ba-share-end,.ba-toc-mobile{display:none}.ba-toc-mobile{border:1px solid color-mix(in oklab,var(--foreground)15%,transparent);background:color-mix(in oklab,var(--foreground)2.5%,transparent);margin-top:2rem}.ba-toc-mobile summary{cursor:pointer;color:var(--foreground);letter-spacing:.14em;text-transform:uppercase;justify-content:space-between;align-items:center;gap:1rem;padding:1rem 1.15rem;font-size:.78rem;font-weight:800;list-style:none;display:flex}.ba-toc-mobile summary::-webkit-details-marker{display:none}.ba-toc-mobile summary svg{color:var(--primary);transition:transform .18s}.ba-toc-mobile[open] summary svg{transform:rotate(180deg)}.ba-toc-mobile ol{counter-reset:ba-toc;padding:0 1.15rem 1rem;display:grid}.ba-toc-mobile li{counter-increment:ba-toc;border-top:1px solid color-mix(in oklab,var(--foreground)8%,transparent)}.ba-toc-mobile a{color:color-mix(in oklab,var(--foreground)75%,transparent);grid-template-columns:2rem minmax(0,1fr);padding-block:.75rem;font-size:.92rem;font-weight:600;line-height:1.4;display:grid}.ba-toc-mobile a:before{color:var(--primary);content:counter(ba-toc,decimal-leading-zero);font-weight:800}.ba-related{border-top:1px solid color-mix(in oklab,var(--foreground)12%,transparent);margin-top:clamp(4.5rem,8vw,7rem);padding-top:clamp(3rem,5vw,4rem)}.ba-related-title{letter-spacing:-.045em;font-size:clamp(1.9rem,3vw,2.6rem);font-weight:730;line-height:1}.ba-body{color:color-mix(in oklab,var(--foreground)74%,transparent);margin-top:2rem}.ba-body [id]{scroll-margin-top:6.5rem}.ba-body>article>:first-child{margin-top:0}.ba-h2{color:var(--foreground);letter-spacing:-.045em;text-wrap:balance;margin-top:clamp(3.5rem,6vw,4.75rem);font-size:clamp(1.9rem,2.8vw,2.6rem);font-weight:730;line-height:1.06}.ba-h3{color:var(--foreground);letter-spacing:-.03em;text-wrap:balance;margin-top:clamp(2.5rem,4vw,3.25rem);font-size:clamp(1.35rem,1.8vw,1.6rem);font-weight:720;line-height:1.2}.ba-h4{color:var(--foreground);letter-spacing:-.015em;margin-top:2rem;font-size:1.12rem;font-weight:720}.ba-p{margin-top:1.15rem;font-size:1.08rem;line-height:1.8}.ba-h2+.ba-p,.ba-h3+.ba-p,.ba-h4+.ba-p{margin-top:1rem}.ba-strong{color:var(--foreground);font-weight:700}.ba-link{color:var(--primary);text-decoration:underline;-webkit-text-decoration-color:color-mix(in oklab,var(--primary)40%,transparent);text-decoration-color:color-mix(in oklab,var(--primary)40%,transparent);text-underline-offset:.2em;font-weight:600;transition:text-decoration-color .18s}.ba-link:hover{-webkit-text-decoration-color:var(--primary);text-decoration-color:var(--primary)}.ba-ul,.ba-ol{gap:.6rem;margin-top:1.15rem;font-size:1.08rem;line-height:1.7;display:grid}.ba-ul>li{padding-left:1.4rem;position:relative}.ba-ul>li:before{background:var(--primary);content:"";width:6px;height:6px;position:absolute;top:.68em;left:.1rem}.ba-ol{counter-reset:ba-item}.ba-ol>li{counter-increment:ba-item;padding-left:2.1rem;position:relative}.ba-ol>li:before{color:var(--primary);content:counter(ba-item,decimal-leading-zero);font-weight:800;position:absolute;left:0}.ba-quote{border-left:2px solid var(--primary);color:var(--foreground);margin-top:2.25rem;padding:.25rem 0 .25rem 1.5rem;font-size:1.2rem;line-height:1.65}.ba-hr{border:0;border-top:1px solid color-mix(in oklab,var(--foreground)12%,transparent);margin-block:3rem}.ba-label{color:var(--primary);letter-spacing:.14em;text-transform:uppercase;font-size:.68rem;font-weight:800}.ba-table-wrap{border:1px solid color-mix(in oklab,var(--foreground)15%,transparent);margin-top:2rem;overflow-x:auto}.ba-table{border-collapse:collapse;text-align:left;width:100%;font-size:.92rem;line-height:1.55}.ba-table th{border-bottom:1px solid color-mix(in oklab,var(--foreground)15%,transparent);background:color-mix(in oklab,var(--foreground)3%,transparent);color:color-mix(in oklab,var(--foreground)60%,transparent);letter-spacing:.12em;text-transform:uppercase;vertical-align:bottom;padding:.95rem 1.1rem;font-size:.68rem;font-weight:800}.ba-table td{border-bottom:1px solid color-mix(in oklab,var(--foreground)8%,transparent);vertical-align:top;padding:.95rem 1.1rem}.ba-table tr:last-child td{border-bottom:0}.ba-table-block{margin-top:2rem}.ba-table-block .ba-table-wrap{margin-top:.75rem}.ba-summary{border:1px solid color-mix(in oklab,var(--foreground)15%,transparent);background:color-mix(in oklab,var(--foreground)2.5%,transparent);margin-top:2.25rem;padding:clamp(1.5rem,2.6vw,2.1rem)}.ba-summary-title{color:var(--foreground);letter-spacing:-.02em;align-items:center;gap:.65rem;font-size:1.15rem;font-weight:730;display:flex}.ba-summary-title svg{color:var(--primary)}.ba-summary .ba-ul,.ba-summary-body{margin-top:1.1rem}.ba-summary-body>:first-child{margin-top:0}.ba-stepper{margin-top:2.5rem}.ba-steps{border-top:1px solid color-mix(in oklab,var(--foreground)15%,transparent);margin-top:1.5rem}.ba-step{border-bottom:1px solid color-mix(in oklab,var(--foreground)15%,transparent);grid-template-columns:3.25rem minmax(0,1fr);gap:1rem;padding-block:1.5rem;display:grid}.ba-step-num{color:var(--primary);letter-spacing:-.04em;font-size:1.45rem;font-weight:760;line-height:1.15}.ba-step-title{color:var(--foreground);letter-spacing:-.02em;font-size:1.15rem;font-weight:720;line-height:1.3}.ba-step-body{margin-top:.4rem}.ba-step-body>:first-child{margin-top:0}.ba-step-body,.ba-step-body .ba-p,.ba-step-body .ba-ul{font-size:1rem}.ba-formula{border:1px solid color-mix(in oklab,var(--foreground)15%,transparent);background:color-mix(in oklab,var(--foreground)2.5%,transparent);margin-top:2.25rem;padding:clamp(1.5rem,2.6vw,2.1rem)}.ba-formula figcaption{gap:.5rem;display:grid}.ba-formula-title{color:var(--foreground);letter-spacing:-.02em;font-size:1.15rem;font-weight:720}.ba-formula-math{color:var(--foreground);margin-top:1.5rem;font-size:1.1rem;overflow-x:auto}.ba-formula-math .katex-display{box-shadow:none;-webkit-backdrop-filter:none;backdrop-filter:none;background:0 0;border:0;margin:0;padding:0}.ba-formula-math .katex-display:before{content:none}.ba-formula-math .katex-display>.katex{color:inherit;filter:none}.ba-formula-note{border-top:1px solid color-mix(in oklab,var(--foreground)10%,transparent);color:color-mix(in oklab,var(--foreground)62%,transparent);margin-top:1.5rem;padding-top:1.25rem;font-size:.95rem;line-height:1.65}.ba-callout{border-left:2px solid var(--primary);background:color-mix(in oklab,var(--primary)8%,transparent);grid-template-columns:auto minmax(0,1fr);gap:1rem;margin-top:2.25rem;padding:1.4rem 1.5rem;display:grid}.ba-callout>svg{color:var(--primary);margin-top:.15rem}.ba-callout[data-type=warning]>svg{color:#f5b544}.ba-callout[data-type=danger]>svg{color:#f26b6b}.ba-callout-title{color:var(--foreground);font-weight:720}.ba-callout-body>:first-child{margin-top:.4rem}.ba-callout-title+.ba-callout-body>:first-child{margin-top:.5rem}.ba-metric{border-block:1px solid color-mix(in oklab,var(--foreground)15%,transparent);grid-template-columns:auto minmax(0,1fr);align-items:center;gap:clamp(1.25rem,3vw,2.25rem);margin-top:2.25rem;padding-block:1.75rem;display:grid}.ba-metric-value{color:var(--foreground);letter-spacing:-.06em;font-size:clamp(2.8rem,5vw,4.2rem);font-weight:730;line-height:.95}.ba-metric-value span{color:var(--primary);margin-left:.15em;font-size:.5em}.ba-metric-label{color:var(--foreground);font-size:1.1rem;font-weight:720}.ba-metric-text{color:color-mix(in oklab,var(--foreground)62%,transparent);margin-top:.35rem;font-size:.95rem;line-height:1.6}.ba-cards{gap:1rem;margin-top:2rem;display:grid}.ba-cards.is-grid{grid-template-columns:repeat(auto-fit,minmax(14rem,1fr))}.ba-card{border:1px solid color-mix(in oklab,var(--foreground)15%,transparent);background:color-mix(in oklab,var(--foreground)2.5%,transparent);padding:clamp(1.4rem,2.4vw,1.9rem)}.ba-card-title{color:var(--foreground);letter-spacing:-.02em;font-size:1.1rem;font-weight:720;line-height:1.3}.ba-card-body,.ba-card-body .ba-p,.ba-card-body .ba-ul{font-size:.98rem}.ba-card-body{margin-top:.6rem;line-height:1.7}.ba-card-body>:first-child{margin-top:0}.ba-faq .sp-faq-list{margin-top:1.75rem}.ba-faq-answer{max-width:62ch;color:var(--muted-foreground);padding-bottom:1.6rem;font-size:1rem;line-height:1.75}.ba-faq-answer>*+*{margin-top:.6rem}.ba-faq-answer .ba-ul{font-size:1rem}.ba-video{margin-block:2.5rem}@media (max-width:1100px){.ba-layout{grid-template-columns:minmax(0,46rem)}.ba-aside{display:none}.ba-share-end,.ba-toc-mobile{display:block}.ba-share-end{border-top:1px solid color-mix(in oklab,var(--foreground)12%,transparent);margin-top:3rem;padding-top:2rem}}@media (max-width:560px){.ba-metric{grid-template-columns:1fr}.ba-formula{padding:1.25rem 1rem}.ba-formula-math{font-size:clamp(.66rem,2.9vw,1rem)}.ba-step{grid-template-columns:2.5rem minmax(0,1fr)}}@media (prefers-reduced-motion:reduce){.ba-head{animation:none}}