:root{font-family:system-ui,sans-serif;color:#0f172a;background:#f8fafc}.sandbox-banner{background:#f59e0b;color:#1f2937;text-align:center;font-weight:700;padding:.5rem;letter-spacing:.08em}.stack{display:flex;flex-direction:column;gap:.75rem;max-width:36rem}.stack label{display:flex;flex-direction:column;gap:.25rem;font-weight:600}.stack input{font:inherit;padding:.4rem .5rem}.row{display:flex;gap:.5rem}.credentials{margin-top:1rem;padding:1rem;background:#fff;border:1px solid #cbd5e1}.error{color:#b91c1c}