.rsvp-button{padding:.75rem 1.75rem;background:linear-gradient(135deg,#0077ff,#00c6ff);color:white;border:none;font-size:1.1rem;font-weight:600;border-radius:50px;cursor:pointer;transition:all .3s ease;box-shadow:0 8px 20px rgba(0,123,255,.3)}.rsvp-button:hover{transform:scale(1.05);background:linear-gradient(135deg,#005fd1,#00aaff);box-shadow:0 10px 25px rgba(0,123,255,.4)}.rsvp-button:active{transform:scale(.98)}.rsvp-button.clicked{background:#28a745;color:white;box-shadow:0 8px 20px rgba(40,167,69,.4);cursor:default}