.bt-fn{border:1px solid var(--color-ink);background:var(--color-surface);color:var(--color-ink);border-radius:2px;margin-block:2.5rem}.bt-fn-head{border-bottom:1px solid var(--color-ink);background:var(--color-ink);align-items:center;gap:.6rem;padding:.6rem 1rem;display:flex}.bt-fn-tag{font-family:var(--font-mono);letter-spacing:.12em;text-transform:uppercase;color:var(--color-cream);font-size:11px;font-weight:500}.bt-fn-head:before{content:"";background:var(--color-brand-red);width:8px;height:8px}.bt-fn-body{padding:1.1rem 1.25rem 1.2rem}.bt-fn .bt-fn-title{font-family:var(--font-sans-tight);letter-spacing:-.01em;color:var(--color-ink);margin:0 0 .6rem;font-size:1.25rem;font-weight:600;line-height:1.25}.bt-fn-copy{color:var(--color-ink-soft);font-size:1.0625rem;line-height:1.6}.bt-fn-copy>*+*{margin-top:.8em}.bt-fn-copy strong{color:var(--color-ink);font-weight:600}.bt-fn .bt-fn-src{font-family:var(--font-mono);letter-spacing:.02em;color:var(--color-ink-soft);margin:.9rem 0 0;font-size:11px}.bt-fn-src a{color:var(--color-ink);text-underline-offset:.2em;text-decoration:underline}.bt-faq{border-top:1px solid var(--color-ink);margin-top:1.5rem}.bt-faq-item{border-bottom:1px solid var(--color-border)}.bt-faq-q{cursor:pointer;min-height:56px;font-family:var(--font-sans-tight);color:var(--color-ink);justify-content:space-between;align-items:center;gap:1rem;padding:.9rem 0;font-size:1.125rem;font-weight:600;line-height:1.3;list-style:none;display:flex}.bt-faq-q::-webkit-details-marker{display:none}.bt-faq-q:hover{color:var(--color-brand-red-hover)}.bt-faq-icon{flex:none;width:14px;height:14px;position:relative}.bt-faq-icon:before,.bt-faq-icon:after{content:"";width:14px;height:1px;transition:transform var(--duration-ui) var(--ease-respond);background:currentColor;position:absolute;top:6.5px;left:0}.bt-faq-icon:after{transform:rotate(90deg)}.bt-faq-item[open] .bt-faq-icon:after{transform:rotate(0)}.bt-faq .bt-faq-a{max-width:62ch;color:var(--color-ink-soft);margin:0;padding:0 0 1.1rem;font-size:1.0625rem;line-height:1.6}@media (prefers-reduced-motion:reduce){.bt-faq-icon:before,.bt-faq-icon:after{transition:none}}