html{scroll-behavior:smooth}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}.bk-blog{--ink: #151515;--ink-70: rgba(21,21,21,.72);--ink-60: rgba(21,21,21,.6);--ink-45: rgba(21,21,21,.45);--ink-30: rgba(21,21,21,.3);--paper: #ffffff;--paper-2: #fafafa;--page: #fbfbfa;--surface: #f3f3f1;--line: rgba(21,21,21,.08);--line-strong: rgba(21,21,21,.16);--accent: #4955e0;--accent-700: #3c44c6;--accent-300: #a8c1f9;--accent-100: #e1ecfe;--accent-50: #eff4fe;--positive: #105537;--positive-bg: #d6f5e0;--ease-out: cubic-bezier(.23,1,.32,1);--r-card: 16px;--nav-h: 72px;--container: 1200px;--gutter: clamp(20px,4vw,40px);--read-w: 800px;font-family:Geist Variable,Geist,ui-sans-serif,system-ui,-apple-system,sans-serif;background:var(--page);color:var(--ink);font-size:15px;line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;min-height:100vh}.bk-blog *,.bk-blog *:before,.bk-blog *:after{box-sizing:border-box}.bk-blog ::-moz-selection{background:var(--accent-100);color:var(--ink)}.bk-blog ::selection{background:var(--accent-100);color:var(--ink)}.bk-blog a{color:inherit;text-decoration:none}.bk-blog button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}.bk-blog ul,.bk-blog ol{list-style:none;margin:0;padding:0}.bk-blog img,.bk-blog svg{display:block;max-width:100%}.bk-blog :focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}.bk-blog .container{max-width:var(--container);margin:0 auto;padding:0 var(--gutter)}.bk-blog .read-col{max-width:var(--read-w);margin-left:auto;margin-right:auto;padding:0 var(--gutter)}.bk-blog .eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:500;color:var(--ink-60)}.bk-blog .eyebrow:before{content:"";width:6px;height:6px;border-radius:50%;background:var(--accent)}.bk-blog .lead{font-size:clamp(16px,1.6vw,18px);line-height:1.55;font-weight:400;color:var(--ink-70);max-width:60ch}.bk-blog .mono{font-family:Geist Mono Variable,Geist Mono,ui-monospace,monospace;font-variant-numeric:tabular-nums}.bk-blog .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:46px;padding:0 24px;border-radius:999px;font-size:15px;font-weight:500;letter-spacing:-.005em;white-space:nowrap;transition:transform .16s var(--ease-out),background-color .16s ease,border-color .16s ease}.bk-blog .btn:active{transform:scale(.97)}.bk-blog .btn-ink{background:var(--ink);color:#fff}.bk-blog .btn-ghost{border:1px solid rgba(21,21,21,.18);color:var(--ink);background:#fff}.bk-blog .btn-light{background:#fff;color:var(--ink)}.bk-blog .btn-sm{height:38px;padding:0 18px;font-size:14px}@media(hover:hover)and (pointer:fine){.bk-blog .btn-ink:hover{background:#000;transform:translateY(-1px)}.bk-blog .btn-ghost:hover{border-color:var(--ink);transform:translateY(-1px)}.bk-blog .btn-light:hover{background:var(--paper-2);transform:translateY(-1px)}}.bk-blog .site-header{position:fixed;inset:0 0 auto;z-index:100;height:var(--nav-h);display:flex;align-items:center;transition:background-color .22s ease,border-color .22s ease,height .22s var(--ease-out),backdrop-filter .22s ease;border-bottom:1px solid transparent}.bk-blog .site-header.scrolled{height:60px;background:#fbfbfad9;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border-bottom-color:var(--line)}.bk-blog .nav{display:flex;align-items:center;gap:32px;width:100%}.bk-blog .brand{display:inline-flex;align-items:center;gap:10px;font-size:19px;font-weight:600;letter-spacing:-.025em}.bk-blog .brand svg{width:30px;height:30px}.bk-blog .nav-links{display:flex;align-items:center;gap:4px;margin:0 auto}.bk-blog .nav-links a{font-size:14.5px;color:var(--ink-60);padding:8px 14px;border-radius:999px;transition:color .15s ease,background-color .15s ease}.bk-blog .nav-links a.active{color:var(--ink)}@media(hover:hover)and (pointer:fine){.bk-blog .nav-links a:hover{color:var(--ink);background:#1515150d}}.bk-blog .nav-cta{display:flex;align-items:center;gap:10px}.bk-blog .nav-login{font-size:14.5px;color:var(--ink-60);padding:8px 12px;transition:color .15s ease}@media(hover:hover)and (pointer:fine){.bk-blog .nav-login:hover{color:var(--accent)}}.bk-blog .menu-btn{display:none;width:42px;height:42px;align-items:center;justify-content:center;border-radius:999px;border:1px solid var(--line-strong)}.bk-blog .menu-btn span{position:relative;width:16px;height:2px;background:var(--ink);border-radius:2px;transition:background-color .12s ease}.bk-blog .menu-btn span:before,.bk-blog .menu-btn span:after{content:"";position:absolute;left:0;width:16px;height:2px;background:var(--ink);border-radius:2px;transition:transform .22s var(--ease-out),top .22s var(--ease-out)}.bk-blog .menu-btn span:before{top:-5px}.bk-blog .menu-btn span:after{top:5px}.bk-blog.menu-open .menu-btn span{background:transparent}.bk-blog.menu-open .menu-btn span:before{top:0;transform:rotate(45deg)}.bk-blog.menu-open .menu-btn span:after{top:0;transform:rotate(-45deg)}.bk-blog .mobile-menu{position:fixed;top:calc(var(--nav-h) + 6px);left:12px;right:12px;z-index:90;background:var(--paper);border:1px solid var(--line);border-radius:20px;box-shadow:0 24px 60px -24px #15151559,0 8px 24px -18px #15151538;display:flex;flex-direction:column;padding:8px 18px 24px;opacity:0;visibility:hidden;transform:translateY(-8px);transition:opacity .22s var(--ease-out),transform .24s var(--ease-out),visibility 0s linear .24s}.bk-blog.menu-open .mobile-menu{opacity:1;visibility:visible;transform:none;transition:opacity .22s var(--ease-out),transform .24s var(--ease-out)}.bk-blog .mobile-menu nav a{display:block;font-size:18px;font-weight:500;letter-spacing:-.015em;padding:11px 0;border-bottom:1px solid var(--line)}.bk-blog .mobile-menu nav a:last-child{border-bottom:0}.bk-blog .mobile-menu .mm-cta{margin-top:104px;display:grid;grid-template-columns:1fr 1fr;gap:10px}.bk-blog .mobile-menu .mm-cta .btn{display:inline-flex;align-items:center;justify-content:center;width:100%;height:44px;padding:0 16px;font-size:14px}.bk-blog .blog-header{padding:calc(var(--nav-h) + clamp(56px,9vh,100px)) 0 clamp(40px,6vh,72px)}.bk-blog .blog-header .eyebrow{margin-bottom:18px}.bk-blog .blog-header h1{font-size:clamp(36px,4.4vw,58px);line-height:1.06;font-weight:400;letter-spacing:-.024em;max-width:22ch;text-wrap:balance}.bk-blog .blog-header .lead{margin-top:20px;max-width:56ch}.bk-blog .cover{position:relative;overflow:hidden;border-radius:14px;background:var(--accent-700);aspect-ratio:16/9}.bk-blog .cover svg{width:100%;height:100%;display:block}.bk-blog .featured{padding-bottom:clamp(56px,8vh,96px)}.bk-blog .featured-card{display:grid;grid-template-columns:1.15fr 1fr;gap:clamp(24px,4vw,48px);align-items:center}.bk-blog .featured-card .cover{aspect-ratio:5/4;border-radius:18px;box-shadow:0 14px 36px -20px #1c1f4a66}.bk-blog .featured-meta{display:flex;align-items:center;gap:14px;font-size:13px;color:var(--ink-45);font-weight:400}.bk-blog .featured-meta .dot{width:3px;height:3px;border-radius:50%;background:var(--ink-30)}.bk-blog .featured-card h2{margin-top:14px;font-size:clamp(28px,3.2vw,40px);line-height:1.1;font-weight:500;letter-spacing:-.02em;text-wrap:balance;transition:color .2s ease}.bk-blog .featured-card .excerpt{margin-top:14px;font-size:17px;line-height:1.55;font-weight:300;color:var(--ink-60);max-width:48ch}.bk-blog .featured-card .read-more{margin-top:22px;display:inline-flex;align-items:center;gap:6px;font-size:15px;font-weight:500;color:var(--ink);transition:color .2s ease}.bk-blog .featured-card .read-more svg{transition:transform .2s var(--ease-out)}@media(hover:hover)and (pointer:fine){.bk-blog .featured-card:hover h2,.bk-blog .featured-card:hover .read-more{color:var(--accent)}.bk-blog .featured-card:hover .read-more svg{transform:translate(4px)}}.bk-blog .cat-tag{display:inline-flex;align-items:center;font-size:12.5px;font-weight:500;color:var(--ink-70);background:var(--surface);border-radius:999px;padding:5px 12px}.bk-blog .article-grid-section{padding:clamp(56px,8vh,80px) 0 clamp(72px,10vh,120px)}.bk-blog .article-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px 24px}.bk-blog .article-card{display:flex;flex-direction:column}.bk-blog .article-card .cover{border-radius:12px;margin-bottom:18px}.bk-blog .article-card .cover svg{transition:transform .7s var(--ease-out)}.bk-blog .article-card-meta{display:flex;align-items:center;gap:12px;font-size:12.5px;color:var(--ink-45);margin-bottom:12px}.bk-blog .article-card-meta .dot{width:3px;height:3px;border-radius:50%;background:var(--ink-30)}.bk-blog .article-card h3{font-size:19px;line-height:1.3;font-weight:500;letter-spacing:-.012em;text-wrap:balance;transition:color .2s ease}.bk-blog .article-card .excerpt{margin-top:10px;font-size:14.5px;line-height:1.55;font-weight:300;color:var(--ink-60)}@media(hover:hover)and (pointer:fine){.bk-blog .article-card:hover h3{color:var(--accent)}.bk-blog .article-card:hover .cover svg{transform:scale(1.03)}}.bk-blog .article{padding-top:calc(var(--nav-h) + clamp(36px,5vh,56px))}.bk-blog .breadcrumb{font-size:13px;color:var(--ink-45);display:flex;align-items:center;gap:8px;margin-bottom:22px}.bk-blog .breadcrumb a{transition:color .15s ease}.bk-blog .breadcrumb a:hover{color:var(--ink)}.bk-blog .breadcrumb .sep{color:var(--ink-30)}.bk-blog .article-head h1{font-size:clamp(34px,4.2vw,54px);line-height:1.05;font-weight:500;letter-spacing:-.026em;text-wrap:balance;max-width:24ch;margin:0 auto;text-align:center}.bk-blog .article-head .lede{margin:22px auto 0;font-family:"Source Serif 4",New York,Iowan Old Style,serif;font-size:clamp(19px,1.9vw,23px);line-height:1.5;font-weight:400;color:var(--ink-70);max-width:50ch;text-align:center;font-feature-settings:"ss01"}.bk-blog .byline{margin-top:36px;display:flex;align-items:center;justify-content:center;gap:14px}.bk-blog .author-card{display:flex;align-items:center;gap:12px}.bk-blog .author-card .avatar{width:42px;height:42px;border-radius:50%;background:#151515;display:inline-flex;align-items:center;justify-content:center;color:#fff;font-size:14px;font-weight:600;overflow:hidden}.bk-blog .author-card .avatar svg{width:100%;height:100%}.bk-blog .author-card .name{font-size:14px;font-weight:500;color:var(--ink);line-height:1.2}.bk-blog .author-card .meta{font-size:13px;color:var(--ink-45);line-height:1.3;margin-top:2px}.bk-blog .prose{font-family:"Source Serif 4",New York,Iowan Old Style,serif;font-size:19px;line-height:1.72;color:var(--ink-70);font-feature-settings:"ss01"}.bk-blog .prose>*+*{margin-top:1.1em}.bk-blog .prose>h2+*{margin-top:.6em}.bk-blog .prose p{font-weight:400}.bk-blog .prose p strong{color:var(--ink);font-weight:500}.bk-blog .prose a{color:var(--accent);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}.bk-blog .prose a:hover{color:var(--accent-700)}.bk-blog .prose h2{font-family:Geist Variable,Geist,sans-serif;font-size:clamp(24px,2.6vw,30px);line-height:1.2;font-weight:500;letter-spacing:-.015em;color:var(--ink);margin-top:2.2em;text-wrap:balance;scroll-margin-top:96px}.bk-blog .prose h3{font-family:Geist Variable,Geist,sans-serif;font-size:20px;line-height:1.3;font-weight:500;letter-spacing:-.01em;color:var(--ink);margin-top:1.6em;scroll-margin-top:96px}.bk-blog .prose blockquote{margin:1.8em 0;padding:0 0 0 24px;border-left:3px solid var(--accent);font-family:"Source Serif 4",serif;font-size:22px;line-height:1.45;font-weight:400;color:var(--ink);font-style:italic}.bk-blog .prose ol,.bk-blog .prose ul{padding-left:0;counter-reset:ol;margin-left:0}.bk-blog .prose ol li,.bk-blog .prose ul li{position:relative;padding-left:30px;margin-top:.7em}.bk-blog .prose ol li:before{counter-increment:ol;content:counter(ol);position:absolute;left:0;top:.1em;width:22px;font-family:Geist Mono Variable,Geist Mono,ui-monospace,monospace;font-size:13px;font-weight:500;color:var(--accent)}.bk-blog .prose ul li:before{content:"";position:absolute;left:8px;top:.85em;width:6px;height:1px;background:var(--accent)}.bk-blog .prose pre,.bk-blog .prose code{font-family:Geist Mono Variable,Geist Mono,ui-monospace,monospace}.bk-blog .prose code{font-size:.88em;background:var(--surface);padding:2px 6px;border-radius:5px;color:var(--ink)}.bk-blog .prose pre{background:var(--surface);border-radius:12px;padding:18px 22px;overflow-x:auto;font-size:14px;line-height:1.6;color:var(--ink)}.bk-blog .prose pre code{background:none;padding:0;font-size:14px}.bk-blog .prose hr{border:0;height:1px;background:var(--line);margin:2.4em 0}.bk-blog .prose figure{margin:1.6em 0}.bk-blog .prose figure img,.bk-blog .prose img{border-radius:12px;width:100%}.bk-blog .prose figcaption{margin-top:10px;font-size:13px;color:var(--ink-45);font-family:Geist Variable,Geist,sans-serif;text-align:center}.bk-blog .prose table{width:100%;margin:1.6em 0;border-collapse:collapse;font-size:15px;font-family:Geist Variable,Geist,sans-serif}.bk-blog .prose th,.bk-blog .prose td{border:1px solid var(--line);padding:.75rem .9rem;text-align:left;vertical-align:top}.bk-blog .prose th{background:var(--surface);font-weight:600;color:var(--ink)}.bk-blog .prose .katex-display{margin:1.75em 0;overflow-x:auto;overflow-y:hidden;background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:1rem 1.2rem}.bk-blog .callout{margin:1.8em 0;background:var(--surface);border-radius:14px;padding:22px 24px;font-family:Geist Variable,Geist,sans-serif;font-size:15px;line-height:1.55;color:var(--ink-70);font-weight:400;display:grid;grid-template-columns:auto 1fr;gap:14px;align-items:start}.bk-blog .callout .icon{width:32px;height:32px;border-radius:8px;background:var(--accent-50);color:var(--accent);display:inline-flex;align-items:center;justify-content:center;flex:none}.bk-blog .callout strong{color:var(--ink);font-weight:500}.bk-blog .figure-card{margin:1.8em 0;background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px;font-family:Geist Variable,Geist,sans-serif}.bk-blog .figure-card .fc-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px;font-size:13px;color:var(--ink-45)}.bk-blog .figure-card .fc-head span:first-child{color:var(--ink);font-weight:500;font-size:14px}.bk-blog .figure-card svg{width:100%;height:auto}.bk-blog .calc-block{margin:1.8em 0;background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px 24px;font-family:Geist Variable,Geist,sans-serif}.bk-blog .calc-head{display:flex;align-items:baseline;gap:12px;margin-bottom:14px;flex-wrap:wrap}.bk-blog .calc-eyebrow{font-size:11.5px;font-weight:500;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-45)}.bk-blog .calc-title{font-size:15px;font-weight:500;color:var(--ink);line-height:1.3}.bk-blog .calc-rows{background:var(--paper-2);border-radius:10px;padding:14px 18px;display:flex;flex-direction:column;gap:8px}.bk-blog .calc-row{display:grid;grid-template-columns:1fr auto 7em;gap:12px;align-items:baseline;font-size:14.5px;line-height:1.5}.bk-blog .calc-var{color:var(--ink-70)}.bk-blog .calc-op{color:var(--ink-45);font-family:Geist Mono Variable,Geist Mono,ui-monospace,monospace;font-size:13px}.bk-blog .calc-val{color:var(--ink);font-weight:500;text-align:right;font-family:Geist Mono Variable,Geist Mono,ui-monospace,monospace;font-variant-numeric:tabular-nums}.bk-blog .calc-divider{height:1px;background:#1515151a;margin:4px 0}.bk-blog .calc-row.result .calc-var{color:var(--ink);font-weight:500}.bk-blog .calc-row.result .calc-val{color:var(--accent)}.bk-blog .calc-foot{margin-top:12px;font-size:13.5px;line-height:1.55;color:var(--ink-60);font-weight:400}@media(max-width:560px){.bk-blog .calc-row{grid-template-columns:1fr auto auto}}.bk-blog .formula-block{margin:2em 0;background:#fff;border:1px solid var(--line);border-radius:14px;padding:26px 28px;font-family:Geist Variable,Geist,sans-serif}.bk-blog .formula-head{display:flex;align-items:baseline;gap:12px;margin-bottom:18px;flex-wrap:wrap}.bk-blog .formula-eyebrow{font-size:11.5px;font-weight:500;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-45)}.bk-blog .formula-title{font-size:15px;font-weight:500;color:var(--ink);line-height:1.3}.bk-blog .formula-equation{display:flex;align-items:center;justify-content:center;gap:8px 12px;flex-wrap:wrap;background:var(--paper-2);border-radius:12px;padding:24px 20px;font-size:clamp(15px,1.7vw,19px);font-weight:400;letter-spacing:-.005em;line-height:1.5;text-align:center}.bk-blog .f-result{font-weight:500;color:var(--ink)}.bk-blog .f-eq,.bk-blog .f-op{color:var(--ink-45);font-family:Geist Mono Variable,Geist Mono,ui-monospace,monospace}.bk-blog .f-term{padding:5px 11px;border-radius:8px;font-weight:400;white-space:nowrap}.bk-blog .f-pos{background:var(--positive-bg);color:var(--positive)}.bk-blog .f-neg{background:#1515150f;color:var(--ink-70)}.bk-blog .formula-vars{margin-top:18px;display:flex;flex-direction:column;gap:10px}.bk-blog .fv-row{display:grid;grid-template-columns:165px 1fr;gap:18px;align-items:baseline;font-size:14px;line-height:1.55}.bk-blog .fv-row dt{display:flex;align-items:center;gap:9px;font-weight:500;color:var(--ink)}.bk-blog .fv-row dd{color:var(--ink-60);font-weight:400}.bk-blog .fv-mark{width:8px;height:8px;border-radius:50%;flex:none}.bk-blog .fv-pos{background:var(--positive)}.bk-blog .fv-neg{background:#15151559}.bk-blog .formula-foot{margin-top:16px;font-size:13.5px;line-height:1.55;color:var(--ink-60);font-weight:400}@media(max-width:560px){.bk-blog .fv-row{grid-template-columns:1fr;gap:4px}.bk-blog .formula-equation{padding:20px 14px;gap:6px 8px;font-size:15px}.bk-blog .f-term{padding:4px 9px}}.bk-blog .article-faq{margin:2em 0;font-family:Geist Variable,Geist,sans-serif}.bk-blog .faq-title{font-family:Geist Variable,Geist,sans-serif;font-size:18px;font-weight:500;color:var(--ink);margin:0 0 4px;letter-spacing:-.012em}.bk-blog .faq-item{border-bottom:1px solid var(--line)}.bk-blog .faq-item:first-of-type{border-top:1px solid var(--line)}.bk-blog .faq-item>summary{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;padding:18px 0;cursor:pointer;list-style:none;font-size:15.5px;font-weight:500;color:var(--ink);line-height:1.4;transition:color .2s ease}.bk-blog .faq-item>summary::-webkit-details-marker{display:none}.bk-blog .faq-item>summary::marker{display:none}.bk-blog .faq-plus{position:relative;width:14px;height:14px;flex:none;margin-top:4px;color:var(--ink-45);transition:color .2s ease}.bk-blog .faq-plus:before,.bk-blog .faq-plus:after{content:"";position:absolute;background:currentColor;border-radius:2px;transition:transform .28s var(--ease-out)}.bk-blog .faq-plus:before{left:50%;top:0;width:1.5px;height:100%;transform:translate(-50%)}.bk-blog .faq-plus:after{left:0;top:50%;width:100%;height:1.5px;transform:translateY(-50%)}.bk-blog .faq-item[open] .faq-plus:before{transform:translate(-50%) rotate(90deg) scaleY(0)}.bk-blog .faq-item[open] .faq-plus:after{transform:translateY(-50%) rotate(180deg)}@media(hover:hover)and (pointer:fine){.bk-blog .faq-item>summary:hover{color:var(--accent)}.bk-blog .faq-item>summary:hover .faq-plus{color:var(--accent)}}.bk-blog .faq-answer{padding:0 32px 20px 0}.bk-blog .faq-answer p{font-family:Geist Variable,Geist,sans-serif;font-size:14.5px;line-height:1.6;color:var(--ink-60);font-weight:400;margin:0}.bk-blog .faq-answer p+p{margin-top:8px}.bk-blog .faq-answer a{color:var(--accent);text-decoration:underline;text-underline-offset:2px}.bk-blog .article-cta{margin:clamp(56px,8vh,80px) auto 0;max-width:760px;background:var(--ink);color:#fff;border-radius:20px;padding:clamp(36px,5vw,56px);display:grid;grid-template-columns:1fr auto;gap:24px;align-items:center;position:relative;overflow:hidden}.bk-blog .article-cta:before{content:"";position:absolute;right:-160px;top:-160px;width:420px;height:420px;border-radius:50%;background:radial-gradient(closest-side,rgba(107,107,239,.4),rgba(73,85,224,.1) 55%,transparent 75%);pointer-events:none}.bk-blog .article-cta h3{position:relative;font-size:clamp(22px,2.4vw,28px);line-height:1.18;font-weight:500;letter-spacing:-.018em;max-width:22ch}.bk-blog .article-cta p{position:relative;margin-top:8px;color:#ffffff9e;font-size:15px;font-weight:300;max-width:42ch}@media(max-width:680px){.bk-blog .article-cta{grid-template-columns:1fr;text-align:left}}.bk-blog .author-bio{max-width:760px;margin:clamp(40px,6vh,56px) auto 0;padding:0 var(--gutter);display:grid;grid-template-columns:64px 1fr;gap:20px;align-items:start}.bk-blog .author-bio .avatar-lg{width:64px;height:64px;border-radius:50%;overflow:hidden;background:var(--ink)}.bk-blog .author-bio .avatar-lg svg{width:100%;height:100%}.bk-blog .author-bio .name{font-size:16px;font-weight:500;color:var(--ink)}.bk-blog .author-bio .role{font-size:13px;color:var(--ink-45);margin-top:2px}.bk-blog .author-bio p{margin-top:10px;font-size:14.5px;line-height:1.6;color:var(--ink-60);font-weight:300;max-width:55ch}.bk-blog .toc{position:fixed;left:max(24px,calc(50vw - 654px));top:50%;transform:translateY(-50%);width:230px;font-size:13px;line-height:1.45;z-index:10;transition:opacity .3s ease,visibility .3s ease}.bk-blog .toc.is-hidden{opacity:0;visibility:hidden;pointer-events:none}.bk-blog .toc ol{display:flex;flex-direction:column;gap:24px}.bk-blog .toc-item{display:flex;align-items:center;gap:16px;color:var(--ink-30);transition:color .28s ease}.bk-blog .toc-item a{color:inherit;display:inline-block;max-width:170px;transition:color .28s ease}.bk-blog .toc-item.is-past{color:var(--ink-45)}.bk-blog .toc-item.is-active{color:var(--ink)}.bk-blog .toc-item.is-future{color:var(--ink-30)}@media(hover:hover)and (pointer:fine){.bk-blog .toc-item a:hover{color:var(--accent)}}.bk-blog .toc-ticks{display:inline-flex;flex-direction:row;align-items:flex-end;gap:3px;flex:none;height:22px}.bk-blog .toc-ticks i{display:block;width:2px;height:9px;background:var(--ink-30);border-radius:1px;transition:background-color .28s ease,height .28s ease}.bk-blog .toc-item.is-past .toc-ticks i,.bk-blog .toc-item.is-active .toc-ticks i{background:var(--ink-45)}.bk-blog .toc-item.is-active .toc-ticks i.is-current{background:var(--ink);height:22px}@media(max-width:1360px){.bk-blog .toc{display:none}}.bk-blog .site-footer{border-top:1px solid var(--line);padding:56px 0 40px}.bk-blog .foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px}.bk-blog .foot-brand p{margin-top:14px;font-size:13.5px;font-weight:300;color:var(--ink-60);max-width:30ch;line-height:1.6}.bk-blog .foot-col h4{font-size:12.5px;font-weight:500;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-45);margin-bottom:14px}.bk-blog .foot-col a{display:block;font-size:14px;color:var(--ink-60);padding:5px 0;transition:color .15s ease}@media(hover:hover)and (pointer:fine){.bk-blog .foot-col a:hover{color:var(--accent)}}.bk-blog .foot-bottom{margin-top:44px;padding-top:22px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}.bk-blog .foot-bottom p{font-size:13px;color:var(--ink-45);font-weight:300}.bk-blog .socials{display:flex;gap:2px;margin-left:-8px}.bk-blog .socials a{width:36px;height:36px;display:inline-flex;align-items:center;justify-content:center;border-radius:999px;color:var(--ink-45);transition:color .15s ease,background-color .15s ease}@media(hover:hover)and (pointer:fine){.bk-blog .socials a:hover{color:var(--ink);background:#1515150d}}.bk-blog.reveal-armed [data-reveal]{opacity:0;transform:translateY(18px);transition:opacity .65s var(--ease-out),transform .65s var(--ease-out)}.bk-blog.reveal-armed [data-reveal].in{opacity:1;transform:none}@media(max-width:980px){.bk-blog .article-grid{grid-template-columns:repeat(2,1fr);gap:32px 20px}.bk-blog .featured-card{grid-template-columns:1fr;gap:28px}.bk-blog .featured-card .cover{aspect-ratio:16/9;border-radius:14px}}@media(max-width:880px){.bk-blog .nav-links,.bk-blog .nav-login{display:none}.bk-blog .menu-btn{display:inline-flex}.bk-blog .nav{justify-content:flex-start;gap:14px}.bk-blog .nav-cta{margin-left:auto}.bk-blog .nav .btn-sm{height:38px;padding:0 14px;font-size:13.5px}}@media(max-width:560px){.bk-blog .article-grid{grid-template-columns:1fr}.bk-blog .foot-grid{grid-template-columns:1fr 1fr;gap:24px}.bk-blog .byline{flex-direction:column;align-items:flex-start}.bk-blog .article-head h1,.bk-blog .article-head .lede{text-align:left;margin-left:0}}@media(prefers-reduced-motion:reduce){.bk-blog *{transition-duration:.01ms!important}.bk-blog .article-card .cover svg{transition:none}}
