:root{--bg: #f5f6f8;--card: #fff;--ink: #1f2937;--muted: #6b7280;--brand: #1d4ed8;--border: #e5e7eb;--err: #b91c1c}*{box-sizing:border-box}body{margin:0;min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}.card{background:var(--card);width:100%;max-width:560px;margin:24px;padding:32px;border:1px solid var(--border);border-radius:14px;box-shadow:0 8px 30px #0000000f}h1{margin:0 0 16px;font-size:22px}.muted{color:var(--muted)}.error{color:var(--err)}.steps{color:var(--ink);line-height:1.6;padding-left:20px}.row{display:flex;flex-wrap:wrap;gap:10px;margin:16px 0}button{padding:9px 14px;font-size:14px;font-weight:600;border-radius:8px;border:1px solid var(--border);background:#fff;color:var(--ink);cursor:pointer}button:hover:not(:disabled){background:#f9fafb}button:disabled{opacity:.5;cursor:default}button.primary{background:var(--brand);color:#fff;border-color:var(--brand)}button.link{border:none;background:none;color:var(--brand);padding:0;text-decoration:underline}code{background:#f3f4f6;padding:1px 5px;border-radius:4px;font-size:.9em}pre{background:#0f172a;color:#e2e8f0;padding:14px;border-radius:8px;overflow-x:auto;font-size:13px;white-space:pre-wrap;word-break:break-all}