/* A full-width door below the seven piano keys; also visible in the simple menu. */
#menu .menu-stack #form-trainer-btn {
  width: 100%; grid-column: 1 / -1; min-height: 52px; margin-top: 12px;
  white-space: normal; text-align: center;
}
html[data-menu="stage"] #menu .menu-stack #form-trainer-btn {
  height: auto; min-height: 56px; flex-direction: row; align-items: center;
  justify-content: center; gap: 10px; padding: 13px 18px; border-radius: 10px;
  border: 1px solid rgba(111,169,255,.5); color: #e0eeff;
  background: linear-gradient(110deg,rgba(52,88,158,.4),rgba(20,37,61,.9));
  box-shadow: none; font-size: 19px; line-height: 1.3; letter-spacing: .04em;
  text-transform: none;
}
html[data-menu="stage"] #menu .menu-stack #form-trainer-btn:hover {
  background: #254776; border-color: #9fc7ff; color: #fff; box-shadow: none;
}
html[data-menu="stage"] #menu .menu-stack #form-trainer-btn:focus-visible {
  outline: 3px solid #a6caff; outline-offset: 3px;
}
@media(max-width:600px){
  html[data-menu="stage"] #menu .menu-stack #form-trainer-btn { font-size: 16px; padding: 12px; }
}