.dialog{
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 999;
}
.dialog[aria-hidden="false"]{
  display: flex;
}
.dialog__backdrop{
  position: absolute;
  inset: 0;
  background: rgba(15,23,42,.35);
}
.dialog__panel{
  position: relative;
  background: #fff;
  padding: 1.5rem 2rem;
  border-radius: 16px;
  box-shadow: 0 18px 45px rgba(15,23,42,.4);
  max-width: 360px;
  width: calc(100% - 2rem);
  color: #111827;
}
.dialog__panel p{
  margin: 0 0 1rem;
}
.dialog__close{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .5rem 1.2rem;
  border-radius: 999px;
  border: 1px solid #e5e7eb;
  background: #f9fafb;
  cursor: pointer;
}
.button.is-loading::after{
  content: "送信中…";
  margin-left: .5rem;
  font-size: .85em;
  opacity: .8;
}