:root{--primary:#2563eb;--secondary:#10b981;--background:#f8fafc;--surface:#fff;--text-main:#0f172a;--text-muted:#64748b;--border:#e2e8f0;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -1px #0000000f}*{box-sizing:border-box;margin:0;padding:0}body{color:var(--text-main);-webkit-font-smoothing:antialiased;background-color:#e2e8f0;justify-content:center;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;display:flex}#root{background:var(--background);flex-direction:column;width:100%;max-width:480px;height:100vh;display:flex;position:relative;overflow:hidden;box-shadow:0 0 20px #0000001a}.screen-container{flex:1;padding:1rem 1rem 80px;overflow-y:auto}.card{background:var(--surface);box-shadow:var(--shadow-sm);border:1px solid var(--border);border-radius:12px;margin-bottom:1rem;padding:1.25rem}.btn-primary{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:8px;justify-content:center;align-items:center;gap:.5rem;width:100%;padding:.75rem 1rem;font-weight:600;display:flex}.btn-secondary{color:var(--primary);cursor:pointer;background:#eff6ff;border:none;border-radius:8px;width:100%;padding:.75rem 1rem;font-weight:600}.nav-bar{background:var(--surface);border-top:1px solid var(--border);z-index:50;justify-content:space-around;align-items:center;height:64px;display:flex;position:absolute;bottom:0;left:0;right:0}.nav-item{color:var(--text-muted);cursor:pointer;flex-direction:column;align-items:center;gap:4px;font-size:.75rem;transition:color .2s;display:flex}.nav-item.active{color:var(--primary)}