.chat-widget { position: fixed; right: 20px; bottom: 20px; z-index: 40; }
.chat-bubble {
  height: 48px;
  padding: 0 18px;
  border: 0;
  border-radius: 999px;
  background: #c4362b;
  color: #fff;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(196, 54, 43, 0.35);
}
.chat-bubble:hover { background: #a92c22; }
.chat-panel {
  position: absolute;
  right: 0;
  bottom: 60px;
  width: min(380px, calc(100vw - 32px));
  height: min(560px, calc(100vh - 120px));
  overflow: hidden;
  background: #fff;
  border: 1px solid #e4e7ec;
  box-shadow: 0 18px 48px rgba(20, 23, 28, 0.22);
}
.chat-panel iframe { width: 100%; height: 100%; border: 0; }