.mbc-portal{font-family:system-ui,Segoe UI,Roboto,Helvetica,Arial,sans-serif;max-width:920px;margin:24px auto}
.mbc-card{background:#fff;border:1px solid #e5e7eb;border-radius:12px;padding:16px;margin:16px 0;box-shadow:0 1px 2px rgba(0,0,0,.04)}
.mbc-pre{background:#f9fafb;padding:12px;border-radius:8px;overflow:auto}
.mbc-promise{font-size:.9rem;color:#374151}
.mbc-hidden{display:none}