:root{--bg:#fff;--surface:#f5f5f7;--text:#1a1a1a;--muted:#6b6b70;--accent:#2f80ed;--border:#e2e2e6;--nav-height:64px}@media (prefers-color-scheme:dark){:root{--bg:#121214;--surface:#1c1c1f;--text:#f2f2f4;--muted:#9a9aa2;--accent:#5b9dff;--border:#2a2a2f}}*{box-sizing:border-box}html,body,#root{height:100%}body{background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}.app-shell{min-height:100%;padding-bottom:var(--nav-height);flex-direction:column;display:flex}.app-main{flex:1;overflow-y:auto}.screen{max-width:640px;margin:0 auto;padding:20px 16px 24px}.screen h1{margin:0 0 12px;font-size:22px}.muted{color:var(--muted);line-height:1.5}.bottom-nav{height:var(--nav-height);background:var(--surface);border-top:1px solid var(--border);padding-bottom:env(safe-area-inset-bottom);display:flex;position:fixed;bottom:0;left:0;right:0}.nav-item{color:var(--muted);cursor:pointer;background:0 0;border:none;flex-direction:column;flex:1;justify-content:center;align-items:center;gap:2px;font-size:12px;display:flex}.nav-item.is-active{color:var(--accent)}.nav-icon{font-size:18px;line-height:1}