:root{
  --accent:#25D366; /* WhatsApp green */
  --accent-dark:#1ebe5a;
  --bg:#f7f7f8;
  --text:#1b1b1b;
}

*{box-sizing:border-box}
body{font-family:Inter,Segoe UI,system-ui,Roboto,Arial,sans-serif;background:var(--bg);color:var(--text);margin:0;padding:0}
.container{max-width:900px;margin:6rem auto;padding:2rem;background:#fff;border-radius:10px;box-shadow:0 6px 18px rgba(0,0,0,.06)}
h1{margin-top:0}
.cta{display:inline-block;margin-top:1rem;padding:0.8rem 1.2rem;background:var(--accent);color:#fff;border-radius:8px;text-decoration:none;font-weight:600}
.cta:hover{background:var(--accent-dark)}

/* Floating WhatsApp FAB */
.whatsapp-fab{position:fixed;right:20px;bottom:20px;width:56px;height:56px;background:linear-gradient(180deg,var(--accent) 0%,var(--accent-dark) 100%);border-radius:50%;display:inline-flex;align-items:center;justify-content:center;box-shadow:0 6px 20px rgba(37,211,102,0.28);text-decoration:none;z-index:9999}
.whatsapp-fab svg{width:24px;height:24px}
.whatsapp-fab:active{transform:translateY(1px)}

/* Accessibility focus */
.whatsapp-fab:focus{outline:3px solid rgba(37,211,102,0.25);outline-offset:3px}

/* Responsive tweaks */
@media (max-width:480px){.container{margin:4rem 1rem;padding:1rem}}