capsule qui “respire” (pulse subtil) pour signaler une action courte en cours (envoi, sauvegarde) .

<!-- 10) Pullsing Capsule -->
<button class="fx10-pill" disabled>Chargement…</button>

<style>
.fx10-pill{
  border:0; padding:12px 18px; border-radius:999px; color:#fff; cursor:default;
  background: linear-gradient(180deg,#0a84ff,#006ae6);
  box-shadow: 0 12px 28px rgba(10,132,255,.35), inset 0 1px 0 rgba(255,255,255,.65);
  font: 700 15px/1 system-ui, -apple-system, "SF Pro Text";
  animation: fx10 1.2s ease-in-out infinite;
…