*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,sans-serif;line-height:1.5;background:#f5f5f5}#root{min-height:100vh;display:flex;align-items:center;justify-content:center}.app{text-align:center;padding:2rem;background:#fff;border-radius:8px;box-shadow:0 1px 3px #0000001a;max-width:420px}.app h1{margin:0 0 .5rem;font-size:1.25rem;font-weight:600}.app p{margin:0 0 1.5rem;color:#666;font-size:.875rem}.btn{display:inline-block;padding:.6rem 1.2rem;font-size:1rem;font-weight:500;color:#fff;background:#2563eb;border:none;border-radius:6px;cursor:pointer;text-decoration:none}.btn:hover{background:#1d4ed8}.btn:disabled{opacity:.6;cursor:not-allowed}.success{color:#059669;font-weight:500}.error{color:#dc2626;font-size:.875rem;margin-top:1rem}