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var(--mobile-safe-bottom))!important;padding-left:max(.8rem, var(--mobile-safe-left))!important}.app-mobile-nav{right:max(.7rem, var(--mobile-safe-right));bottom:max(.65rem, var(--mobile-safe-bottom));left:max(.7rem, var(--mobile-safe-left));contain:layout paint;border-radius:1.55rem;min-height:4.75rem;padding-bottom:.4rem;transform:translateZ(0)}[data-platform=ios] .app-mobile-nav{-webkit-backdrop-filter:blur(28px)saturate(165%);backdrop-filter:blur(28px)saturate(165%);background:#13101fc7;border-color:#ffffff24;box-shadow:0 16px 48px #0000005c,inset 0 1px #ffffff14}[data-platform=android] .app-mobile-nav{background:linear-gradient(145deg,#1a152bf5,#0d0f1df5);border-color:#8b5cf62e;border-radius:1.35rem;box-shadow:0 12px 32px #0000006b}.mobile-navigation-item{touch-action:manipulation;min-height:3.8rem}.mobile-navigation-item.is-active:before{content:"";background:#c4b5fd;border-radius:99px;width:1.35rem;height:.16rem;position:absolute;top:.2rem;box-shadow:0 0 12px #c4b5fdb3}.mobile-menu-sheet{padding-right:max(1.25rem, var(--mobile-safe-right));padding-bottom:calc(1.25rem + var(--mobile-safe-bottom));padding-left:max(1.25rem, var(--mobile-safe-left));overscroll-behavior:contain;animation:.36s cubic-bezier(.16,1,.3,1) both mobile-sheet-rise}input,textarea,select{font-size:16px!important}button,[role=button]{-webkit-touch-callout:none}.study-flashcard-stage:hover{transform:none}.virtual-keyboard-open .app-mobile-nav,.virtual-keyboard-open .mobile-install-prompt{display:none}.virtual-keyboard-open .app-page-scroll{scroll-padding-bottom:1rem;padding-bottom:max(1rem, var(--mobile-safe-bottom))!important}}@keyframes mobile-sheet-rise{0%{opacity:.7;transform:translateY(100%)}to{opacity:1;transform:none}}@media (width<=390px){.app-mobile-nav{left:.4rem;right:.4rem}.mobile-navigation-item{font-size:9px}.mobile-install-prompt{align-items:flex-start}.mobile-install-action{align-self:center}}@media (orientation:landscape) and (height<=520px) and (pointer:coarse){.app-mobile-nav{min-height:3.65rem}.mobile-navigation-item{flex-direction:row;min-height:3rem}.app-page-scroll{padding-bottom:calc(4.8rem + var(--mobile-safe-bottom))!important}.mobile-install-prompt{display:none}}@media (width>=768px) and (width<=899px) and (pointer:coarse){.app-desktop-sidebar{display:none!important}.app-mobile-brand{display:flex!important}.app-mobile-nav{right:max(1rem, var(--mobile-safe-right));bottom:max(.8rem, var(--mobile-safe-bottom));left:max(1rem, var(--mobile-safe-left));border-radius:1.55rem;min-height:4.75rem;display:grid!important}.app-page-scroll{padding-bottom:calc(6.4rem + var(--mobile-safe-bottom))!important}}@media (prefers-reduced-motion:reduce){.mobile-install-prompt,.mobile-menu-sheet{animation:none}}.exercise-glass{-webkit-backdrop-filter:blur(22px);backdrop-filter:blur(22px);background:linear-gradient(145deg,#ffffff13,#ffffff05);border:1px solid #ffffff14;border-radius:1.75rem;box-shadow:inset 0 1px #ffffff12,0 24px 70px #00000052}@media (width<=767px){#root{padding-bottom:5.75rem}}@keyframes language-picker-enter{0%{opacity:0;transform:translateY(-6px)scale(.985)}to{opacity:1;transform:translateY(0)scale(1)}}.language-picker-menu{transform-origin:top;scrollbar-width:thin;scrollbar-color:#a855f773 transparent;animation:.18s cubic-bezier(.2,.8,.2,1) both language-picker-enter}.app-desktop-sidebar{border-inline-end:var(--rule-thin) solid var(--color-rule);background:var(--color-paper-2);color:var(--color-ink)}.app-sidebar-brand{align-items:center;gap:var(--space-sm);padding:var(--space-xl) var(--space-lg) var(--space-2xl);text-align:start;display:flex}.app-wordmark-mark{border:var(--rule-thin) solid var(--color-rule-strong);border-radius:var(--radius-control);width:2.5rem;height:2.5rem;color:var(--color-accent);font-family:var(--font-mono);font-size:var(--text-xs);letter-spacing:.08em;flex:none;place-items:center;font-weight:700;display:grid}.app-wordmark{color:var(--color-ink);font-family:var(--font-display);font-size:var(--text-md);letter-spacing:-.035em;font-weight:700;line-height:1}.app-wordmark-caption,.app-sidebar-label{color:var(--color-muted);font-size:var(--text-xs)}.app-wordmark-caption{margin-top:var(--space-xs)}.app-sidebar-label{margin:0 var(--space-md) var(--space-sm);font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;font-weight:600}.app-sidebar-item,.sidebar-utility{align-items:center;gap:var(--space-sm);width:100%;min-height:3rem;padding:var(--space-sm) var(--space-md);border-radius:var(--radius-control);color:var(--color-muted);font-size:var(--text-sm);text-align:start;white-space:nowrap;transition:color var(--dur-short) var(--ease-out), 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#00000059}.solid-tag-indigo{background-color:#4f46e5!important;border-color:#6366f1!important}.solid-tag-violet{background-color:#7c3aed!important;border-color:#8b5cf6!important}.solid-tag-purple{background-color:#9333ea!important;border-color:#a855f7!important}.solid-tag-emerald{background-color:#059669!important;border-color:#10b981!important}.solid-tag-teal{background-color:#0d9488!important;border-color:#14b8a6!important}.solid-tag-amber{background-color:#d97706!important;border-color:#f59e0b!important}.solid-tag-orange{background-color:#ea580c!important;border-color:#f97316!important}.solid-tag-rose{background-color:#e11d48!important;border-color:#f43f5e!important}.solid-tag-coral{background-color:#f43f5e!important;border-color:#fb7185!important}.solid-tag-cyan{background-color:#0284c7!important;border-color:#0ea5e9!important}.solid-tag-blue{background-color:#2563eb!important;border-color:#3b82f6!important}.solid-tag-slate{background-color:#475569!important;border-color:#64748b!important}.solid-tag-sm{border-radius:.375rem;padding:.12rem .45rem;font-size:.6875rem}:root{--nb-coral:#f43f5e;--nb-emerald:#10b981;--nb-amber:#f59e0b;--nb-indigo:#6366f1;--nb-cyan:#06b6d4;--nb-purple:#a855f7;--nb-border:#32314a;--nb-surface:#151424}.notebook-card{border:2px solid var(--nb-border);background-color:var(--nb-surface);box-shadow:4px 4px 0px 0px var(--nb-shadow,var(--nb-indigo));border-radius:1.25rem;transition:transform .18s cubic-bezier(.16,1,.3,1),box-shadow .18s cubic-bezier(.16,1,.3,1),border-color .18s;position:relative}.notebook-card:hover{box-shadow:5px 5px 0px 0px var(--nb-shadow,var(--nb-indigo));transform:translate(-1px,-1px)}.notebook-card-coral{--nb-shadow:var(--nb-coral)}.notebook-card-emerald{--nb-shadow:var(--nb-emerald)}.notebook-card-amber{--nb-shadow:var(--nb-amber)}.notebook-card-indigo{--nb-shadow:var(--nb-indigo)}.notebook-card-cyan{--nb-shadow:var(--nb-cyan)}.notebook-card-purple{--nb-shadow:var(--nb-purple)}.notebook-card-header{border-bottom:2px solid 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