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rgba(0,0,0,.3)}.learning-app .mobile-nav{display:flex;align-items:center;position:fixed;z-index:90;left:50%;transform:translate(-50%) scale(var(--as-flex-x, 1),var(--as-flex-y, 1));bottom:calc(14px + env(safe-area-inset-bottom));width:min(100% - 28px,460px);height:64px;padding:5px;box-sizing:border-box;border-radius:9999px;background:var(--nav-fill);backdrop-filter:var(--as-glass-filter, blur(20px) saturate(180%) brightness(1.05) contrast(1.02));border:0;isolation:isolate;box-shadow:var(--nav-shadow),inset 0 .5px .5px rgba(255,255,255,.8),inset 0 -.5px .5px rgba(0,0,0,.05);transition:transform .4s cubic-bezier(.16,1,.3,1),opacity .28s ease,box-shadow .28s ease,background-color .24s ease}.learning-app.theme-dark .mobile-nav{box-shadow:var(--nav-shadow),inset 0 .5px .5px rgba(255,255,255,.22),inset 0 -.5px .5px rgba(0,0,0,.35)}.learning-app .nav-selection{position:absolute;z-index:0;inset-block:5px;inset-inline-start:5px;width:calc((100% - 10px)/5);height:calc(100% - 10px);border-radius:9999px;background:color-mix(in srgb,var(--accent) 13%,rgba(255,255,255,.65));box-shadow:0 2px 8px -2px rgba(18,28,51,.08),inset 0 .5px .5px rgba(255,255,255,.8),inset 0 -.5px .5px rgba(0,0,0,.04);transform:translate(calc(var(--nav-index, 0) * 100%));transition:transform .36s cubic-bezier(.16,1,.3,1),background-color .24s ease,box-shadow .24s ease;pointer-events:none}.learning-app.theme-dark .nav-selection{background:color-mix(in srgb,var(--accent) 22%,rgba(255,255,255,.08));box-shadow:0 2px 10px -2px rgba(0,0,0,.35),inset 0 .5px .5px rgba(255,255,255,.22),inset 0 -.5px .5px rgba(0,0,0,.3)}.learning-app .mobile-nav-item{margin:0;padding:7px 2px 5px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;flex:1;height:100%;box-sizing:border-box;font-size:10px;font-weight:500;line-height:1.2;background:transparent;color:var(--nav-muted);border:0;border-radius:9999px;position:relative;z-index:2;cursor:pointer;transition:color .22s ease,opacity .22s ease,transform .15s ease}.learning-app .mobile-nav-item:active{transform:scale(.92)}.learning-app .mobile-nav-item.selected{color:var(--accent);font-weight:650;opacity:1}.learning-app .mobile-nav-item.selected .app-icon{transform:scale(1.1);transition:transform .25s cubic-bezier(.34,1.56,.64,1)}.learning-app .mobile-nav-item .app-icon{transition:transform .22s ease}.learning-app .mobile-nav[data-glass-scheme=dark] .mobile-nav-item.selected{color:var(--accent-on-dark, var(--accent))}.learning-app .mobile-nav[data-glass-scheme=light] .mobile-nav-item.selected{color:var(--accent-on-light, var(--accent))}.learning-app .mobile-nav:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;z-index:1;border-radius:inherit;pointer-events:none;background:radial-gradient(140px 80px at var(--as-px, 50%) var(--as-py, 50%),rgba(255,255,255,.28),transparent 70%);opacity:var(--as-glow, 0);transition:opacity .2s ease}.learning-app.theme-dark .mobile-nav:after{background:radial-gradient(140px 80px at var(--as-px, 50%) var(--as-py, 50%),rgba(255,255,255,.12),transparent 70%)}@supports ((-webkit-mask-composite: xor) or (mask-composite: exclude)) or (-webkit-mask-composite: xor){.learning-app .mobile-nav:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;z-index:1;padding:1px;border-radius:inherit;pointer-events:none;background:conic-gradient(from var(--as-glass-light-angle, 135deg),var(--nav-rim-hi),var(--nav-rim-lo) 38deg,transparent 88deg,transparent 272deg,var(--nav-rim-lo) 322deg,var(--nav-rim-hi));-webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude}}@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))){.learning-app .mobile-nav,.learning-app .desktop-nav{background:var(--surface)}}@media (prefers-reduced-motion: reduce){.learning-app .mobile-nav{transform:translate(-50%);transition:none}.learning-app .nav-selection{transition:none}.learning-app .mobile-nav:after{display:none}}@media (prefers-reduced-transparency: reduce),(prefers-contrast: more){.learning-app .mobile-nav,.learning-app .desktop-nav{background:var(--surface);backdrop-filter:none}.learning-app .mobile-nav:before,.learning-app .mobile-nav:after{display:none}}@media (prefers-contrast: more){.learning-app .mobile-nav{border:1.5px solid var(--text)}.learning-app .mobile-nav .mobile-nav-item{color:var(--text)}}@media (forced-colors: active){.learning-app .mobile-nav,.learning-app .desktop-nav{background:Canvas;border:1px solid CanvasText;backdrop-filter:none}.learning-app .mobile-nav .mobile-nav-item,.learning-app .desktop-nav .nav-item{color:CanvasText}.learning-app .nav-selection{outline:1px solid Highlight;background:transparent}}