:root { --fb-base: clamp(15px, 1.05vw + 0.6rem, 17px); }
  html { font-size: var(--fb-base); }
  @media (max-width: 640px){ button, .btn, .cta, a.btn, a.cta { min-height:44px; min-width:44px; touch-action:manipulation; } .container, main { padding-left:1rem; padding-right:1rem; } }