button.is-loading,
input.is-loading {
  opacity: 0.92;
  pointer-events: none;
  cursor: wait;
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

button.is-loading::before,
input.is-loading::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    120deg,
    transparent 0%,
    rgba(255, 255, 255, 0.32) 45%,
    transparent 70%
  );
  transform: translateX(-140%);
  animation: submit-shimmer 1.2s ease-in-out infinite;
  z-index: 1;
}

button.is-loading .submit-label,
button.is-loading .submit-spinner,
input.is-loading {
  position: relative;
  z-index: 2;
}

button.is-loading {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
}

button.is-loading .submit-spinner {
  width: 0.9rem;
  height: 0.9rem;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-top-color: currentColor;
  display: inline-block;
  animation: submit-spin 0.7s linear infinite;
}

button.is-loading .submit-label {
  opacity: 0.96;
}

input.is-loading {
  background-image: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.07),
    rgba(255, 255, 255, 0.18),
    rgba(255, 255, 255, 0.07)
  );
  background-size: 200% 100%;
  animation: submit-field-glow 1.1s ease-in-out infinite;
}

@keyframes submit-spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes submit-shimmer {
  100% {
    transform: translateX(140%);
  }
}

@keyframes submit-field-glow {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}