.bts{--bts-ink:var(--color-text);--bts-sub:var(--color-text-subtle);--bts-muted:var(--color-text-muted);--bts-line:#e6eaf1;--bts-blue:var(--color-primary);--bts-soft:#f4f7fc;--bts-r:16px;--bts-gap:72px}.bts main{background:#fff}.bts ::selection{background:#dbe6fd;color:var(--bts-ink)}.bts .sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}.bts main a:focus-visible{outline:2px solid var(--bts-blue);outline-offset:3px;border-radius:6px}.bts main .material-symbols{display:inline-flex;align-items:center;justify-content:center;flex:none;width:1.2em;height:1.2em;overflow:hidden;font-family:Material Symbols Outlined;font-size:1.2em;font-weight:400;font-style:normal;line-height:1;letter-spacing:normal;text-transform:none;white-space:nowrap;font-feature-settings:"liga"}.bts-masthead{padding:56px 0 0}.bts-masthead>.container{padding-bottom:8px}.bts-masthead h1{font-size:clamp(2.25rem,4.6vw,3.5rem);line-height:1.06;letter-spacing:-.03em;margin:6px 0 14px;color:var(--bts-ink);text-wrap:balance}.bts-masthead-home{padding-top:64px}.bts-brandrow{display:flex;align-items:flex-end;justify-content:space-between;gap:40px}.bts-masthead .bts-logo{font-size:clamp(2.75rem,6.4vw,4.75rem);font-weight:800;letter-spacing:-.04em;line-height:.98;margin:0 0 16px}.bts-sub{font-size:1.125rem;line-height:1.6;color:var(--bts-sub);max-width:40rem;margin:0}.bts-kicker{display:inline-flex;align-items:center;gap:6px;font-size:.8125rem;font-weight:700;color:var(--bts-blue);margin:0;text-decoration:none}.bts main .bts-kicker .material-symbols{font-size:1.3em}.bts-topics{display:flex;gap:10px;overflow-x:auto;scrollbar-width:none;margin:36px 0 0;padding:2px 0 6px}.bts-topics::-webkit-scrollbar{display:none}.bts-topics a{flex:none;display:inline-flex;align-items:center;gap:6px;height:42px;box-sizing:border-box;padding:0 18px;border:1px solid var(--bts-line);border-radius:999px;background:#fff;color:var(--bts-sub);font-size:.9375rem;font-weight:600;white-space:nowrap;text-decoration:none;transition:background-color .2s,color .2s,border-color .2s}.bts-topics a:hover{border-color:#c9d6ee;color:var(--bts-ink);background:var(--bts-soft)}.bts-topics a[aria-current]{background:var(--bts-ink);border-color:var(--bts-ink);color:#fff}.bts-topics-browse{color:var(--bts-blue)!important}@media (min-width:1024px){.bts-topics{flex-wrap:wrap;overflow:visible}}@media (max-width:1023px){.bts-topics{-webkit-mask-image:linear-gradient(90deg,#000 calc(100% - 48px),transparent);mask-image:linear-gradient(90deg,#000 calc(100% - 48px),transparent);padding-right:40px}}.bts-search-wrap{position:relative;flex:0 1 360px;margin-bottom:18px}.bts-search{position:relative}.bts-search .material-symbols{position:absolute;left:16px;top:50%;transform:translateY(-50%);color:var(--bts-muted)}.bts .bts-search input{width:100%;box-sizing:border-box;height:52px;padding:0 18px 0 46px;border:1px solid var(--bts-line)!important;border-radius:999px!important;font:inherit;font-size:1rem;background:var(--bts-soft);color:var(--bts-ink);transition:background-color .2s,box-shadow .2s}.bts-search input::placeholder{color:#7b8496}.bts-search input:focus{outline:none;background:#fff;box-shadow:0 0 0 3px #dbe6fd,0 10px 30px #07163014;border-color:var(--bts-blue)}.bts-results{position:absolute;z-index:20;left:0;right:0;top:calc(100% + 8px);background:#fff;border:1px solid var(--bts-line);border-radius:16px;overflow:hidden;box-shadow:0 22px 50px #07163024}.bts-results a{display:block;padding:12px 18px;text-decoration:none;color:var(--bts-ink);border-top:1px solid var(--bts-line);font-size:.9375rem;line-height:1.4}.bts-results a:first-child{border-top:0}.bts-results a:hover,.bts-results a:focus{background:var(--bts-soft)}.bts-results small{display:block;color:var(--bts-blue);font-weight:700;font-size:.75rem}.bts-results p{margin:14px 18px;color:var(--bts-muted)}.bts-photo{position:relative;margin:0;aspect-ratio:3/2;overflow:hidden;border-radius:var(--bts-r);background:var(--bts-soft)}.bts-photo img{display:block;width:100%;height:100%;object-fit:cover;transition:transform .7s var(--mp-ease-out)}a:hover .bts-photo img{transform:scale(1.04)}.bts-chip{position:absolute;left:12px;bottom:12px;display:inline-flex;align-items:center;max-width:calc(100% - 24px);height:28px;padding:0 12px;border-radius:999px;background:#fffffff0;color:var(--bts-ink);font-size:.75rem;font-weight:700;line-height:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;box-shadow:0 2px 10px #0716301f}.bts-photo-sm{border-radius:12px;aspect-ratio:4/3}.bts-meta{display:inline-flex;flex-wrap:wrap;align-items:center;gap:6px;font-size:.8125rem;color:var(--bts-muted);font-weight:500}.bts-by{display:inline-flex;align-items:center;gap:8px;font-size:.8125rem;font-weight:600;color:var(--bts-sub)}.bts-avatar{flex:none;display:inline-grid;place-items:center;width:40px;height:40px;border-radius:50%;background:#dbe6fd;color:#06287a;font-weight:800;font-size:.875rem}.bts-avatar-sm{width:28px;height:28px;font-size:.6875rem}.bts-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:44px 32px}.bts-card-link{display:flex;flex-direction:column;gap:18px;height:100%;color:inherit;text-decoration:none}.bts-card-body{display:flex;flex-direction:column;gap:10px;flex:1}.bts-card h3{font-size:1.25rem;line-height:1.3;letter-spacing:-.015em;font-weight:700;margin:0;color:var(--bts-ink);text-wrap:balance;transition:color .2s}.bts-card p{margin:0;color:var(--bts-sub);font-size:.9375rem;line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.bts-card .bts-by{margin-top:auto;padding-top:6px}.bts-card-link:hover h3,.bts-row a:hover h3,.bts-lead-story a:hover h2{color:var(--bts-blue)}.bts-card[hidden]{display:none}.bts-row a{display:grid;grid-template-columns:120px minmax(0,1fr);gap:18px;align-items:center;color:inherit;text-decoration:none}.bts-row h3{font-size:1.0625rem;line-height:1.35;font-weight:700;margin:4px 0 6px;color:var(--bts-ink);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;transition:color .2s}.bts-row-cat{font-size:.75rem;font-weight:700;color:var(--bts-blue)}.bts-rows{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px 40px}.bts-row-lg a{grid-template-columns:200px minmax(0,1fr);align-items:start;gap:20px}.bts-row-lg h3{margin:0 0 6px;font-size:1.125rem;-webkit-line-clamp:2}.bts-row-lg p{margin:0 0 10px;color:var(--bts-sub);font-size:.9375rem;line-height:1.55;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.bts-subgroup{padding-top:8px;border-top:1px solid var(--bts-line)}.bts-subgroup .bts-h-sub{margin:20px 0 22px}.bts-front{display:grid;grid-template-columns:minmax(0,1.7fr) minmax(0,1fr);gap:48px;padding-top:48px}.bts-lead-story a{position:relative;display:block;height:100%;min-height:520px;border-radius:24px;overflow:hidden;color:#fff;text-decoration:none;isolation:isolate}.bts-photo-lead{position:absolute;inset:0;aspect-ratio:auto;border-radius:0}.bts-photo-lead:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,#07163000 30%,#0716308c 62%,#071630e6)}.bts-lead-copy{position:absolute;left:0;right:0;bottom:0;z-index:1;padding:40px 44px;display:flex;flex-direction:column;align-items:flex-start;gap:14px}.bts-lead-copy .bts-chip{position:static;box-shadow:none}.bts-lead-story h2{font-size:clamp(1.75rem,3vw,2.625rem);line-height:1.12;letter-spacing:-.025em;margin:0;color:#fff;max-width:22ch;text-wrap:balance}.bts-lead-story a:hover h2{color:#fff;text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:6px}.bts-lead-story p{margin:0;font-size:1.0625rem;line-height:1.6;color:#ffffffdb;max-width:56ch;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.bts-lead-meta{display:flex;flex-wrap:wrap;align-items:center;gap:8px 18px;margin-top:4px}.bts-lead-meta .bts-by,.bts-lead-meta .bts-meta{color:#ffffffdb}.bts-lead-meta .bts-avatar{background:#ffffffe6}.bts-front-side{display:flex;flex-direction:column;gap:24px}.bts-front-side .bts-h{margin:0;padding-bottom:16px;border-bottom:1px solid var(--bts-line)}.bts-section{padding:var(--bts-gap) 0 0}.bts-masthead+.bts-section{padding-top:40px}.bts-section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;margin-bottom:24px}.bts-section-head .bts-h{margin:0}.bts-section-head a{display:inline-flex;align-items:center;gap:6px;height:40px;padding:0 16px;border-radius:999px;background:var(--bts-soft);color:var(--bts-blue);font-size:.875rem;font-weight:700;text-decoration:none;white-space:nowrap;transition:background-color .2s}.bts-section-head a:hover{background:#e3ebfb}.bts-h{display:flex;align-items:center;gap:10px;font-size:clamp(1.5rem,2.4vw,2rem);line-height:1.2;letter-spacing:-.025em;font-weight:700;margin:0 0 28px;color:var(--bts-ink)}.bts-h .material-symbols{color:var(--bts-blue)}.bts-subgroup+.bts-subgroup{margin-top:56px}.bts-h-sub{font-size:1.375rem;scroll-margin-top:100px}.bts-topic-tiles{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.bts-topic-tile{display:flex;align-items:center;gap:16px;padding:14px 18px 14px 14px;border:1px solid var(--bts-line);border-radius:20px;background:#fff;color:var(--bts-ink);text-decoration:none;transition:border-color .2s,box-shadow .3s var(--mp-ease-out),transform .3s var(--mp-ease-out)}.bts-topic-tile:hover{border-color:#cfdbf2;box-shadow:0 12px 30px #1f3f7817;transform:translateY(-2px)}.bts-topic-img{flex:none;width:64px;height:64px;border-radius:50%;overflow:hidden;background:var(--bts-soft);box-shadow:0 0 0 4px #fff,0 4px 14px #07163024}.bts-topic-img img{width:100%;height:100%;object-fit:cover;display:block}.bts-topic-tile>span:last-child{min-width:0}.bts-topic-tile strong{display:block;font-size:1.0625rem;line-height:1.3}.bts-topic-tile small{display:block;margin-top:2px;font-size:.8125rem;color:var(--bts-muted);font-weight:500}.bts-shelf{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:32px}.bts-shelf .bts-card h3{font-size:1.125rem}.bts-ind-chips{display:flex;flex-wrap:wrap;gap:10px}.bts-ind-chips a{display:inline-flex;align-items:center;gap:8px;height:46px;padding:0 8px 0 18px;border-radius:999px;border:1px solid var(--bts-line);color:var(--bts-ink);font-size:.9375rem;font-weight:600;text-decoration:none;transition:border-color .2s,background-color .2s}.bts-ind-chips a:hover{border-color:var(--bts-blue);background:var(--bts-soft)}.bts-ind-chips small{display:inline-grid;place-items:center;min-width:30px;height:30px;padding:0 8px;box-sizing:border-box;border-radius:999px;background:var(--bts-soft);color:var(--bts-sub);font-size:.75rem;font-weight:700}.bts-ind-chips .material-symbols{color:var(--bts-blue)}.bts-hub-chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}.bts-hub-chips a{flex:none;display:inline-flex;align-items:center;height:34px;box-sizing:border-box;padding:0 14px;border-radius:999px;border:1px solid var(--bts-line);background:#fff;color:var(--bts-sub);font-size:.8125rem;font-weight:600;white-space:nowrap;text-decoration:none}.bts-hub-chips a:hover{border-color:var(--bts-blue);color:var(--bts-blue)}.bts-hub-actions{display:flex;flex-wrap:wrap;align-items:center;gap:12px 20px;margin-top:20px}.bts-hub-actions .bts-hub-chips{margin-top:0}.bts-hub-actions .button{text-decoration:none}.bts-browse-link{display:inline-flex;align-items:center;gap:6px;color:var(--bts-blue);font-weight:700;text-decoration:none}.bts-groups{columns:4 250px;column-gap:20px}.bts-group{break-inside:avoid;display:flex;flex-direction:column;margin:0 0 20px;border:1px solid var(--bts-line);border-radius:12px;background:#fff;padding:18px 18px 8px}.bts-groups-even{columns:auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:20px}.bts-groups-even .bts-group{margin:0}.bts-groups-even .bts-group ul{margin-top:auto}.bts-group h3{display:flex;align-items:center;gap:10px;margin:0 0 10px;font-size:1rem;line-height:1.3;color:var(--bts-ink)}.bts main .bts-group h3 .material-symbols{width:32px;height:32px;border-radius:9px;background:var(--bts-soft);color:var(--bts-blue);font-size:1.15rem}.bts-group h3 a{color:inherit;text-decoration:none}.bts-group h3 a:hover{color:var(--bts-blue)}.bts-group p{margin:0 0 10px;color:var(--bts-sub);font-size:.875rem;line-height:1.5}.bts-group ul{list-style:none;margin:0;padding:0}.bts-group li a{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 0;border-top:1px solid var(--bts-line);color:var(--bts-ink);font-size:.9375rem;font-weight:600;text-decoration:none}.bts-group li a:hover{color:var(--bts-blue)}.bts-group li small{flex:none;min-width:24px;padding:2px 8px;border-radius:999px;background:var(--bts-soft);color:var(--bts-sub);font-size:.75rem;font-weight:700;text-align:center}.bts-filters{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px;align-items:end;padding:20px;border-radius:12px;background:var(--bts-soft)}.bts-filter{display:flex;flex-direction:column;gap:6px;min-width:0;font-size:.75rem;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--bts-muted)}.bts-filter select,.bts-filter input{width:100%;min-width:0;box-sizing:border-box;height:42px;padding:0 12px;border:1px solid var(--bts-line);border-radius:10px;background:#fff;font:inherit;font-size:.9375rem;font-weight:500;letter-spacing:0;text-transform:none;color:var(--bts-ink)}.bts-filter-q{grid-column:span 2}.bts-filter-reset{height:42px;border:0;background:none;color:var(--bts-blue);font:inherit;font-weight:700;cursor:pointer;justify-self:start}.bts-filter-more{display:none}.bts-count{margin:24px 0 20px;color:var(--bts-muted);font-weight:600}.bts-more{display:flex;align-items:center;justify-content:center;margin:48px auto 0;min-width:240px;height:50px;padding:0 28px;border:1px solid #c9d6ee;border-radius:999px;background:#fff;color:var(--bts-blue);font:inherit;font-size:.9375rem;font-weight:700;cursor:pointer;transition:background-color .2s,border-color .2s}.bts-more:hover{background:var(--bts-soft);border-color:var(--bts-blue)}.bts-more:focus-visible{outline:2px solid var(--bts-blue);outline-offset:3px}.bts-more[hidden]{display:none}.bts-empty{color:var(--bts-muted)}.bts-avatar-lg{width:56px;height:56px;font-size:1.125rem}.bts-avatar-xl{width:88px;height:88px;font-size:1.75rem}.bts-profile{display:flex;gap:24px;align-items:flex-start;margin-top:12px}.bts-focus{display:flex;flex-wrap:wrap;gap:8px;list-style:none;padding:0;margin:18px 0 0}.bts-focus li{padding:6px 14px;border-radius:999px;background:var(--bts-soft);font-size:.8125rem;font-weight:600;color:var(--bts-sub)}.bts-crumbs ol{display:flex;flex-wrap:wrap;gap:6px;list-style:none;padding:0;margin:0 0 20px;font-size:.8125rem;color:var(--bts-muted)}.bts-crumbs li+li:before{content:"/";margin-right:6px;color:#c7cfdc}.bts-crumbs a{color:var(--bts-muted);text-decoration:none}.bts-crumbs a:hover{color:var(--bts-blue);text-decoration:underline}.bts-crumbs [aria-current]{color:var(--bts-sub);max-width:28ch;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}@supports (animation-timeline: scroll()){.bts-article:before{content:"";position:fixed;z-index:200;top:0;left:0;right:0;height:3px;background:var(--bts-blue);transform-origin:0 50%;transform:scaleX(0);animation:bts-read linear both;animation-timeline:scroll(root)}@keyframes bts-read{to{transform:scaleX(1)}}}.bts-narrow{max-width:48rem;margin-inline:auto}.bts-article-head{padding:56px 0 40px}.bts-article-head h1{font-size:clamp(2rem,4.4vw,3.25rem);line-height:1.1;letter-spacing:-.03em;margin:14px 0 18px;color:var(--bts-ink);text-wrap:balance}.bts-dek{font-size:1.25rem;line-height:1.6;color:var(--bts-sub);margin:0 0 28px;max-width:44rem}.bts-byline{display:flex;flex-wrap:wrap;align-items:center;gap:14px;font-size:.9375rem}.bts-byline a{font-weight:700;color:var(--bts-ink);text-decoration:none}.bts-byline a:hover{color:var(--bts-blue)}.bts-byline small{display:block;color:var(--bts-muted)}.bts-dates{color:var(--bts-muted);margin-left:auto}.bts-hero-wrap{max-width:48rem;margin-inline:auto}.bts-hero{aspect-ratio:16/9;border-radius:24px}.bts-credit{margin:10px 0 0;font-size:.75rem;color:var(--bts-muted)}.bts-credit a{color:inherit}.bts-article-grid{max-width:48rem;margin-inline:auto;padding-top:48px}.bts-toc-side{display:none}@media (min-width:1280px){.bts-article-head .bts-narrow,.bts-hero-wrap,.bts-article-grid{max-width:1104px}.bts-article-head h1,.bts-article-head .bts-dek,.bts-byline{max-width:48rem}.bts-article-grid{display:grid;grid-template-columns:minmax(0,48rem) 248px;justify-content:space-between}.bts-toc-side{order:2;display:block;position:sticky;top:110px;align-self:start;max-height:calc(100vh - 140px);overflow:auto;font-size:.875rem}.bts-toc-side h2{font-size:.8125rem;color:var(--bts-ink);margin:0 0 12px}.bts-toc-side ol{list-style:none;padding:0;margin:0;border-left:2px solid var(--bts-line)}.bts-toc-side a{display:block;padding:7px 0 7px 14px;margin-left:-2px;border-left:2px solid transparent;color:var(--bts-sub);text-decoration:none;line-height:1.4}.bts-toc-side a:hover{color:var(--bts-blue);border-left-color:var(--bts-blue)}.bts-body .bts-toc{display:none}}.bts-toc{margin:0 0 20px;border:1px solid var(--bts-line);border-radius:16px;background:#fff;font-size:.9375rem}.bts-toc summary{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px 20px;font-weight:700;color:var(--bts-ink);cursor:pointer;list-style:none}.bts-toc summary::-webkit-details-marker{display:none}.bts-toc summary:after{content:"";width:9px;height:9px;border-right:2px solid var(--bts-muted);border-bottom:2px solid var(--bts-muted);transform:rotate(45deg) translateY(-3px);transition:transform .2s;margin-left:auto}.bts-toc[open] summary:after{transform:rotate(225deg) translateY(-2px)}.bts-toc-n{font-weight:500;font-size:.8125rem;color:var(--bts-muted)}.bts-toc ol{margin:0;padding:4px 20px 18px 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