/* Mark 18 October: sticky navigation at every width and accessible Back to top. */
.site-header{position:sticky;top:18px;z-index:40}
html{scroll-padding-top:104px}
section{scroll-margin-top:26px}
.back-to-top{position:fixed;right:max(16px,env(safe-area-inset-right));bottom:max(16px,env(safe-area-inset-bottom));z-index:30;width:auto;height:auto;min-height:48px;display:flex;gap:8px;padding:10px 16px;border-radius:28px;background:#b692ed;color:#0a0a0a;font:700 15px/1.4 Arial,Helvetica,sans-serif}
.back-to-top[hidden],body.menu-open>.back-to-top{display:none!important}
.back-to-top .icon{width:22px;height:22px;margin:0}
.site-footer{padding-bottom:88px}
@media(max-width:760px){.site-header{top:10px}html{scroll-padding-top:86px}}
@media(prefers-reduced-motion:reduce){.back-to-top{transition:none}}