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nav a.active{background:var(--water-tint);color:var(--water-strong)}.shell-nav-foot{flex-direction:column;gap:14px;margin-top:auto;display:flex}.shell-learner{align-items:center;gap:10px;padding:0 6px;display:flex}.shell-learner-lang{font-weight:700}.shell-demo-link{font:inherit;text-align:left;cursor:pointer;background:0 0;border:none;padding:0 6px;text-decoration:none}.shell-demo-link:hover{color:var(--ink-2)}.shell-main{flex:1;min-width:0;overflow-y:auto}.app-splash{background:var(--bg);place-items:center;height:100%;display:grid}.app-splash-error{text-align:center;grid-auto-flow:row;gap:16px;padding:24px}.app-splash-msg{max-width:340px;color:var(--ink-2);margin:0}.app-splash-actions{gap:10px;display:flex}.app-splash-mascot{animation:3s ease-in-out infinite app-splash-bob}@keyframes app-splash-bob{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.shell-topbar,.shell-tabbar{display:none}@media (width<=760px){.shell{flex-direction:column}.shell-nav{display:none}.shell-topbar{padding:calc(8px + env(safe-area-inset-top)) 14px 8px;border-bottom:1px solid var(--border);background:var(--surface);flex:none;align-items:center;gap:10px;display:flex}.shell-topbar-dial{place-items:center;margin-left:auto;display:grid}.shell-topbar-out{color:var(--ink-3);cursor:pointer;background:0 0;border:none;border-radius:8px;place-items:center;padding:8px;display:grid}.shell-topbar-out:hover{background:var(--surface-2);color:var(--ink-2)}.shell-main{flex:1;min-height:0}.shell-tabbar{border-top:1px solid var(--border);background:var(--surface);padding:6px max(10px, env(safe-area-inset-left)) calc(6px + env(safe-area-inset-bottom)) max(10px, env(safe-area-inset-right));flex:none;display:flex}.shell-tabbar a{min-height:48px;color:var(--ink-3);border-radius:10px;flex-direction:column;flex:1;justify-content:center;align-items:center;gap:3px;font-size:11px;font-weight:600;text-decoration:none;display:flex}.shell-tabbar a.active{color:var(--water-strong);background:var(--water-tint)}}