:root{--mf-blue:#1d4ed8;--mf-blue-dark:#1e40af;--mf-blue-light:#3b82f6;--mf-bg:#fff;--mf-bg-subtle:#f8fafc;--mf-border:#e2e8f0;--mf-text:#0f172a;--mf-text-muted:#475569;--font-system:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji"}*{box-sizing:border-box}body,html{margin:0;padding:0;color:var(--mf-text);background:var(--mf-bg);font-family:var(--font-system);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}a{color:var(--mf-blue);text-decoration:none}a:hover{text-decoration:underline}.mf-btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.625rem 1.25rem;border-radius:.5rem;background:var(--mf-blue);color:#fff;font-weight:600;font-size:.95rem;border:none;cursor:pointer;transition:background .15s ease}.mf-btn:hover{background:var(--mf-blue-dark);text-decoration:none}.mf-btn-secondary{background:var(--mf-bg-subtle);color:var(--mf-blue);border:1px solid var(--mf-border)}.mf-btn-secondary:hover{background:#eef2ff}.mf-sigma{color:var(--mf-blue);font-weight:700}