#brx-content{scroll-margin-top:var(--header-height,4.5rem)}.reading-tools{position:relative;z-index:var(--z-floating);pointer-events:none}.reading-progress{position:fixed;inset:0 0 auto;height:var(--motion-progress-height,3px);background:color-mix(in srgb,currentColor 12%,transparent);pointer-events:none}.reading-progress-fill{width:100%;height:100%;transform:scaleX(0);transform-origin:left center;background:var(--brand-primary,#b42318);animation:weipei-reading-progress linear both;animation-timeline:scroll(root block)}@keyframes weipei-reading-progress{to{transform:scaleX(1)}}.back-to-top{position:fixed;right:max(var(--space-m), env(safe-area-inset-right));bottom:max(calc(var(--mobile-action-bar-height) + var(--space-m)), env(safe-area-inset-bottom));min-width:var(--touch-target);min-height:var(--touch-target);padding:.65rem .9rem;display:inline-flex;align-items:center;justify-content:center;border:1px solid color-mix(in srgb,currentColor 18%,transparent);border-radius:var(--radius-pill);background:var(--surface,#fff);color:var(--brand-dark,#3e0703);box-shadow:var(--shadow-small);font:inherit;font-size:max(0.875rem, var(--text-s));line-height:1;cursor:pointer;pointer-events:none;opacity:0;visibility:hidden;transform:translateY(.5rem);animation:weipei-back-to-top linear both;animation-timeline:scroll(root block);animation-range:32rem 42rem}@keyframes weipei-back-to-top{to{opacity:1;visibility:visible;pointer-events:auto;transform:translateY(0)}}.back-to-top:hover{box-shadow:var(--shadow-hover)}.back-to-top:focus-visible{outline:3px solid var(--focus);outline-offset:3px}@media (min-width:768px){.back-to-top{bottom:max(var(--space-l), env(safe-area-inset-bottom))}}@media (prefers-reduced-motion:reduce){.reading-progress-fill,.back-to-top{animation-duration:0.01ms}}