@font-face{font-family:"Montserrat";font-style:normal;font-weight:100 900;font-display:swap;src:url(/assets/fonts/montserrat-latin.woff2) format("woff2")}
:root{--btb-blue:#186EF9;--btb-blue-deep:#0F57CC;--btb-link:#1257C9;--btb-navy:#202B40;--btb-ink:#202B40;--btb-muted:#4A5874;--btb-warm:#FFFBF2;--btb-sky:#DEF0FB;--btb-sky-2:#EEF6FE;--btb-orange:#F46026;--btb-line:#DCE3EF;--btb-card:#FFFFFF;--btb-bg:#FFFFFF;--btb-foot:#131926;--btb-foot-ink:#E6EBF5;--btb-shadow:0 1px 2px rgba(32,43,64,.06),0 6px 18px rgba(32,43,64,.06);--btb-head-font:"Montserrat","Segoe UI",Arial,sans-serif;--btb-body-font:-apple-system,BlinkMacSystemFont,"Helvetica Neue",Helvetica,"Segoe UI",Arial,Roboto,sans-serif}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:16px}
body{margin:0;background:var(--btb-bg);color:var(--btb-ink);font:17px/1.65 var(--btb-body-font)}
img{max-width:100%;height:auto;display:block}
a{color:var(--btb-link);text-underline-offset:2px}
a:hover{color:var(--btb-blue-deep)}
h1,h2,h3{font-family:var(--btb-head-font);color:var(--btb-navy);line-height:1.22;letter-spacing:-.01em}
h1{font-size:clamp(30px,4.2vw,46px);font-weight:800;margin:0 0 14px}
h2{font-size:clamp(24px,2.6vw,31px);font-weight:750;margin:46px 0 14px}
h3{font-size:20px;font-weight:700;margin:26px 0 8px}
p{margin:0 0 14px}
ul,ol{margin:0 0 16px;padding-left:22px}
li{margin:0 0 6px}
:focus-visible{outline:3px solid var(--btb-orange);outline-offset:2px}
.btb-skip{position:absolute;left:-9999px;top:0;background:var(--btb-navy);color:#fff;padding:12px 16px;z-index:10}
.btb-skip:focus{left:8px;top:8px}
.btb-indie{margin:0;background:var(--btb-sky);color:var(--btb-navy);font-size:14px;text-align:center;padding:7px 16px}
.btb-head{background:#fff;border-bottom:1px solid var(--btb-line);position:relative}
.btb-head__in{max-width:1220px;margin:0 auto;padding:10px 24px;display:flex;align-items:center;gap:22px}
.btb-brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--btb-navy);flex:none;min-height:44px}
.btb-brand img{width:150px;height:auto}
.btb-brand__txt{font-family:var(--btb-head-font);font-weight:600;font-size:15px;color:var(--btb-muted);white-space:nowrap}
.btb-brand__txt b{color:var(--btb-blue-deep);font-weight:800}
.btb-nav{margin-left:auto;min-width:0}
.btb-nav ul{list-style:none;margin:0;padding:0;display:flex;gap:2px}
.btb-nav li{margin:0;flex:none}
.btb-nav a{display:flex;align-items:center;min-height:44px;min-width:44px;padding:0 11px;border-radius:999px;color:var(--btb-navy);text-decoration:none;font-weight:600;font-size:15px;white-space:nowrap}
.btb-nav a:hover{background:var(--btb-sky-2);color:var(--btb-blue-deep)}
.btb-nav a[aria-current=page]{background:var(--btb-sky);color:var(--btb-blue-deep)}
.btb-main{display:block}
.btb-wrap{max-width:1120px;margin:0 auto;padding:0 24px}
.btb-col{max-width:868px;margin:0 auto;padding:0 24px}
.btb-crumbs{max-width:868px;margin:18px auto 0;padding:0 24px;font-size:14px;color:var(--btb-muted)}
.btb-crumbs p{margin:0}
.btb-crumbs a{display:inline-block;padding:10px 2px;min-height:44px;min-width:44px;line-height:24px;text-align:center}
/* hero */
.btb-hero{background:linear-gradient(180deg,#F4F9FF 0%,var(--btb-warm) 100%);border-bottom:1px solid var(--btb-line)}
.btb-hero__in{max-width:1220px;margin:0 auto;padding:34px 24px 26px;display:grid;grid-template-columns:minmax(0,1.6fr) minmax(0,.8fr);gap:30px;align-items:center}
.btb-hero__lede{font-size:19px;color:var(--btb-muted);max-width:640px;margin-bottom:18px}
.btb-find{display:flex;gap:10px;max-width:720px;background:#fff;border:2px solid var(--btb-blue);border-radius:999px;padding:6px 6px 6px 18px;box-shadow:var(--btb-shadow)}
.btb-find label{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.btb-find input[type=search]{flex:1;min-width:0;border:0;font:inherit;font-size:17px;color:var(--btb-ink);background:transparent;min-height:46px;outline:none}
.btb-find button{flex:none;border:0;border-radius:999px;background:var(--btb-blue-deep);color:#fff;font:inherit;font-weight:700;padding:0 26px;min-height:48px;cursor:pointer}
.btb-find button:hover{background:#0B47A8}
.btb-find__hint{font-size:14px;color:var(--btb-muted);margin:10px 0 0 6px}
.btb-strip{list-style:none;margin:18px 0 0;padding:0;display:flex;flex-wrap:wrap;gap:6px 18px}
.btb-strip li{margin:0}
.btb-strip a{display:inline-flex;align-items:center;min-height:44px;font-weight:650;color:var(--btb-navy);text-decoration:underline;text-decoration-color:var(--btb-orange);text-decoration-thickness:2px;text-underline-offset:5px}
.btb-strip a:hover{color:var(--btb-blue-deep)}
.btb-hero__fox{justify-self:end;width:100%;max-width:420px}
.btb-hero__fox img{width:100%;height:auto;border-radius:22px}
/* shelf wall */
.btb-wall{padding:30px 0 10px}
.btb-wall h2{margin-top:6px}
.btb-wall__intro{color:var(--btb-muted);max-width:820px}
.btb-band{margin:22px 0 0}
.btb-band__head{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;margin-bottom:10px}
.btb-band__head h3{margin:0;font-size:19px}
.btb-band__head h3 a{display:inline-flex;align-items:center;min-height:44px}
.btb-band__head p{margin:0;color:var(--btb-muted);font-size:15px}
.btb-tiles{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(8,minmax(0,1fr));gap:14px}
.btb-tiles--5{grid-template-columns:repeat(5,minmax(0,1fr))}.btb-tiles--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.btb-band-pair{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,3fr);gap:14px;align-items:start}
.btb-wall .btb-wrap,.btb-shelfwall{max-width:1220px}
.btb-tile{margin:0}
.btb-tile a{display:flex;flex-direction:column;height:100%;background:var(--btb-card);border:1px solid var(--btb-line);border-radius:14px;overflow:hidden;text-decoration:none;color:var(--btb-ink);box-shadow:var(--btb-shadow);position:relative}
.btb-tile a:hover{border-color:var(--btb-blue)}
.btb-tile__pic{display:flex;align-items:center;justify-content:center;aspect-ratio:1/1;background:#F3F5F9}
.btb-tile__pic img{width:100%;height:auto}
.btb-tile__lens{position:absolute;top:8px;left:8px;font-size:12px;font-weight:700;letter-spacing:.02em;padding:3px 9px;border-radius:999px;background:#fff;color:var(--btb-navy);border:1px solid var(--btb-line)}
.btb-tile--tag .btb-tile__lens{border-color:#9BBDF7}
.btb-tile--surface .btb-tile__lens{border-color:#F4B08F}
.btb-tile--route .btb-tile__lens{border-color:#8E9BB5}
.btb-tile__name{display:block;font-family:var(--btb-head-font);font-weight:700;font-size:16px;padding:10px 12px 2px;color:var(--btb-navy)}
.btb-tile__note{display:block;font-size:14px;color:var(--btb-muted);padding:0 12px 12px;line-height:1.4}
/* sections */
.btb-sec{padding:12px 0 6px}
.btb-sec--warm{background:var(--btb-warm);border-top:1px solid var(--btb-line);border-bottom:1px solid var(--btb-line);padding:6px 0 26px;margin-top:34px}
.btb-twocol{columns:2;column-gap:40px}
.btb-twocol p{break-inside:avoid}
.btb-more{font-weight:650}
a.btb-more,.btb-more a{display:inline-flex;align-items:center;min-height:44px}
.btb-fig{margin:22px 0 26px}
.btb-fig img{width:100%;height:auto;border-radius:12px;border:1px solid var(--btb-line);background:#fff}
.btb-fig figcaption{font-size:14px;color:var(--btb-muted);margin-top:8px;line-height:1.5}
.btb-note{background:var(--btb-sky-2);border-left:4px solid var(--btb-blue);padding:14px 18px;border-radius:0 10px 10px 0;margin:18px 0}
.btb-note p:last-child{margin:0}
.btb-warn{background:#FFF4EC;border-left:4px solid var(--btb-orange);padding:14px 18px;border-radius:0 10px 10px 0;margin:18px 0}
.btb-warn p:last-child{margin:0}
.btb-lede{font-size:19px;color:var(--btb-muted)}
.btb-toc{background:var(--btb-warm);border:1px solid var(--btb-line);border-radius:12px;padding:14px 18px;margin:18px 0 8px}
.btb-toc p{margin:0 0 6px;font-weight:700;color:var(--btb-navy)}
.btb-toc ul{margin:0;padding-left:20px}
.btb-toc a{display:inline-flex;align-items:center;min-height:44px;min-width:44px}
.btb-table{width:100%;border-collapse:collapse;font-size:15px;margin:10px 0 22px}
.btb-table th,.btb-table td{text-align:left;padding:9px 10px;border-bottom:1px solid var(--btb-line);vertical-align:top}
.btb-table th{font-family:var(--btb-head-font);font-size:14px;color:var(--btb-navy);background:var(--btb-sky-2)}
.btb-scroll{overflow-x:auto;position:relative}
.btb-steps{list-style:none;padding:0;margin:0;counter-reset:btbstep}
.btb-step{counter-increment:btbstep;border-top:1px solid var(--btb-line);padding-top:6px;margin:0 0 10px}
.btb-step h2::before{content:counter(btbstep);display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:50%;background:var(--btb-blue-deep);color:#fff;font-size:18px;margin-right:12px;vertical-align:3px}
.btb-pick{display:grid;grid-template-columns:200px minmax(0,1fr);gap:20px;align-items:start;background:var(--btb-card);border:1px solid var(--btb-line);border-radius:14px;padding:16px;margin:16px 0 22px;box-shadow:var(--btb-shadow)}
.btb-pick__img img{width:200px;height:auto;border-radius:10px}
.btb-pick__body p{margin:0 0 8px}
.btb-pick__body ul{margin:0 0 8px}
.btb-pick__go{display:flex;flex-wrap:wrap;gap:6px 18px}
.btb-pick__go a{display:inline-flex;align-items:center;min-height:44px;font-weight:650}
.btb-cta{display:inline-flex;align-items:center;min-height:48px;padding:0 24px;border-radius:999px;background:var(--btb-blue-deep);color:#fff;font-weight:700;text-decoration:none}
.btb-cta:hover{background:#0B47A8;color:#fff}
.btb-tool{background:var(--btb-card);border:1px solid var(--btb-line);border-radius:16px;padding:18px 20px 20px;margin:16px 0 26px;box-shadow:var(--btb-shadow)}
.btb-tool label{display:block;font-weight:650;margin:10px 0 4px;color:var(--btb-navy)}
.btb-tool select,.btb-tool input{font:inherit;font-size:16px;min-height:46px;padding:8px 12px;border:1px solid #B9C4D8;border-radius:10px;background:#fff;color:var(--btb-ink);width:100%;max-width:360px}
.btb-tool__row{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:4px 14px}
.btb-tool button{margin-top:14px;font:inherit;font-weight:700;min-height:46px;padding:0 22px;border-radius:999px;border:0;background:var(--btb-blue-deep);color:#fff;cursor:pointer}
.btb-tool__out{margin-top:14px;background:var(--btb-sky-2);border-radius:12px;padding:12px 14px;min-height:48px}
.btb-tool__out p{margin:0 0 6px}
.btb-vid{margin:22px 0 26px}
.btb-vid__btn{display:block;width:100%;padding:0;border:0;background:none;cursor:pointer;position:relative;border-radius:12px;overflow:hidden}
.btb-vid__btn img{width:100%;height:auto;border-radius:12px;border:1px solid var(--btb-line)}
.btb-vid__play{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);display:flex;align-items:center;gap:10px;background:rgba(15,87,204,.94);color:#fff;font-weight:700;padding:12px 22px;border-radius:999px;font-size:16px}
.btb-vid video{width:100%;height:auto;border-radius:12px;background:#000;display:block}
.btb-vid figcaption{font-size:14px;color:var(--btb-muted);margin-top:8px}
.btb-vslot{aspect-ratio:16/9;width:100%;background:#0d1320;border-radius:12px;margin:22px 0}
.btb-gslot{aspect-ratio:16/10;width:100%;margin:22px 0;background:var(--btb-sky-2);border-radius:12px}
.btb-faq dt{font-family:var(--btb-head-font);font-weight:700;color:var(--btb-navy);margin:18px 0 6px;font-size:18px}
.btb-faq dd{margin:0 0 10px}
.btb-glos dt{font-weight:700;color:var(--btb-navy);margin:14px 0 4px}
.btb-glos dd{margin:0 0 8px}
.btb-group-nav{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0 4px;padding:0;list-style:none}
.btb-group-nav li{margin:0}
.btb-group-nav a{display:inline-flex;align-items:center;min-height:44px;padding:0 16px;border:1px solid var(--btb-line);border-radius:999px;text-decoration:none;font-weight:650;color:var(--btb-navy);background:#fff}
.btb-group-nav a[aria-current=page]{border-color:var(--btb-blue);background:var(--btb-sky-2)}
.btb-404{padding:60px 0}
/* footer */
.btb-foot{background:var(--btb-foot);color:var(--btb-foot-ink);margin-top:56px}
.btb-foot__in{max-width:1220px;margin:0 auto;padding:40px 24px 36px;display:grid;grid-template-columns:minmax(0,1.6fr) repeat(3,minmax(0,1fr));gap:28px}
.btb-foot__name{font-family:var(--btb-head-font);font-weight:800;font-size:18px;color:#fff}
.btb-foot__h{font-weight:700;color:#fff;margin-bottom:6px}
.btb-foot__txt{font-size:14px;line-height:1.6}
.btb-foot ul{list-style:none;padding:0;margin:0}
.btb-foot li{margin:0}
.btb-foot a{color:#CFE0FF;display:inline-flex;align-items:center;min-height:44px;min-width:44px}
.btb-foot__txt a{display:inline;min-height:0}
@media (max-width:1100px){
.btb-tiles,.btb-tiles--5,.btb-tiles--3{grid-template-columns:repeat(4,minmax(0,1fr))}
.btb-band-pair{grid-template-columns:minmax(0,1fr)}
.btb-brand__txt{display:none}
.btb-nav a{padding:0 9px;font-size:14.5px}
}
@media (max-width:900px){
.btb-head__in{flex-wrap:wrap;gap:4px;padding:8px 16px}
.btb-nav{margin-left:0;width:100%;overflow-x:auto;position:relative}
.btb-nav ul{width:max-content}
.btb-hero__in{grid-template-columns:minmax(0,1fr);padding:24px 18px 20px}
.btb-hero__fox{display:none}
.btb-twocol{columns:1}
.btb-foot__in{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
}
@media (max-width:700px){
body{font-size:16.5px}
.btb-wrap,.btb-col{padding:0 18px}
.btb-crumbs{padding:0 18px}
.btb-tiles,.btb-tiles--5,.btb-tiles--3{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.btb-find{padding:5px 5px 5px 14px}
.btb-find button{padding:0 16px}
.btb-fig--wide{overflow-x:auto;position:relative}
.btb-fig--wide img{width:720px;max-width:none}
.btb-fig--wide figcaption{position:sticky;left:0;max-width:calc(100vw - 36px)}
.btb-pick{grid-template-columns:minmax(0,1fr)}
.btb-pick__img img{width:100%;max-width:320px}
.btb-foot__in{grid-template-columns:minmax(0,1fr)}
}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
@media (prefers-color-scheme:dark){
:root{--btb-bg:#0E1422;--btb-ink:#E4E9F3;--btb-navy:#F1F5FC;--btb-muted:#B4C0D6;--btb-warm:#151C2C;--btb-sky:#1B2A44;--btb-sky-2:#17233A;--btb-line:#2A3650;--btb-card:#141B2B;--btb-link:#8CB6FF;--btb-shadow:none}
a:hover{color:#B5D0FF}
.btb-head{background:#101828}
.btb-brand{background:#fff;border-radius:10px;padding:4px 10px}
.btb-brand__txt{color:#4A5874}
.btb-brand__txt b{color:#0F57CC}
.btb-hero{background:linear-gradient(180deg,#121B2E 0%,#0E1422 100%)}
.btb-find{background:#0E1422}
.btb-tile__lens{background:#0E1422;color:#F1F5FC}
.btb-tile__pic{background:#1A2235}
.btb-fig img,.btb-vid__btn img{border-color:#2A3650}
.btb-warn{background:#2A1D16}
.btb-tool select,.btb-tool input{background:#0E1422;color:#E4E9F3;border-color:#3A4A68}
.btb-group-nav a{background:#141B2B}
.btb-strip a:hover{color:#B5D0FF}
.btb-nav a{color:#E4E9F3}
.btb-nav a[aria-current=page],.btb-nav a:hover{background:#1B2A44;color:#B5D0FF}
.btb-group-nav a[aria-current=page]{background:#1B2A44}
}

/* Official hero artwork aligned with brand reference; verified 2026-10-25. */
.btb-hero{background:linear-gradient(90deg,rgba(245,250,255,.96) 0%,rgba(245,250,255,.85) 40%,rgba(245,250,255,0) 73%),url(/assets/img/btb-official-hero-20261025.webp) center/cover no-repeat;color:#102f56}
.btb-hero h1,.btb-hero p{color:#102f56}
@media(min-width:801px){.btb-hero__fox{visibility:hidden}}
@media(max-width:800px){.btb-hero{background-image:linear-gradient(rgba(245,250,255,.94),rgba(245,250,255,.94)),url(/assets/img/btb-official-hero-20261025.webp);background-position:65% center}}
@media(max-width:800px){.btb-hero__fox{visibility:visible}}