One-flavon flavor: A single hierarchical parameter <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mi>B</mml:mi> </mml:math> organizes quarks and leptons at <mml:math

Flavor hierarchies emerge from a single hierarchical parameter $B$ in a one-flavon Froggatt--Nielsen scheme. Fixing $B=5.357$ from charged-lepton ratios ($m_e:m_\mu:m_\tau\!\propto\!\epsilon^5:\epsilon^2:1$, $\epsilon=1/B$), we reproduce quark masses and CKM targets at $M_Z$ with $\ordone$ coefficients. The same $\epsilon$ gives viable lepton textures and benchmarks for $U_{\rm PMNS}$, $\sum m_\nu$, and $m_{\beta\beta}$. Compact correlations ($|V_{us}|,|V_{cb}|,|V_{ub}|,\theta_{13}^{\rm PMNS}$) follow from powers of $\epsilon$.