/* ===== WhatsApp Floating Button (mobile-first) ===== */
  .whatsapp-fab{position:fixed; right:16px; bottom:16px; z-index:60; display:inline-flex; align-items:center; justify-content:center; width:56px; height:56px; border-radius:999px; text-decoration:none; background:#25D366; color:#fff; font-size:26px; box-shadow:0 12px 24px rgba(0,0,0,.18)}
  .whatsapp-fab:after{content:""; position:absolute; inset:0; border-radius:inherit; box-shadow:0 0 0 0 rgba(37,211,102,.4); animation:pulse 2.2s infinite}
  @keyframes pulse{to{box-shadow:0 0 0 22px rgba(37,211,102,0)}}
  @media (min-width:900px){ .whatsapp-fab{bottom:24px; right:24px} }