:root{--bg:#f8fafc;--fg:#0f172a;--muted:#64748b;--accent:#0f766e;--accent-fg:#fff;--warning:#b45309;--border:#cbd5e1;color:var(--fg);background:var(--bg);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}@media (prefers-color-scheme:dark){:root{--bg:#0b1220;--fg:#e2e8f0;--muted:#94a3b8;--accent:#14b8a6;--accent-fg:#042f2e;--warning:#fbbf24;--border:#334155}}*{box-sizing:border-box}body{background:var(--bg);margin:0}.shell{text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:1.25rem;min-height:100dvh;padding:1rem;display:flex}.brand{letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:0;font-size:1rem;font-weight:600}.greeting{margin:0;font-size:2rem;font-weight:600}.warning{color:var(--warning);margin:0}button{font:inherit;cursor:pointer;border-radius:.5rem;min-height:44px;padding:.75rem 1.5rem}button.primary{background:var(--accent);color:var(--accent-fg);border:none;font-weight:600}button.secondary{color:var(--muted);border:1px solid var(--border);background:0 0}