.completion-popup {
  position: fixed;
  inset: 0;
  z-index: 100000;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: blur(8px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 220ms ease, visibility 220ms ease;
}

.completion-popup.is-visible {
  opacity: 1;
  visibility: visible;
}

.completion-popup__card {
  position: relative;
  width: min(430px, 100%);
  overflow: hidden;
  padding: 38px 32px 30px;
  border: 2px solid var(--completion-accent, #f6d365);
  border-radius: 24px;
  color: var(--completion-text, #fff);
  text-align: center;
  background:
    radial-gradient(circle at 50% 0, color-mix(in srgb, var(--completion-accent, #f6d365) 34%, transparent), transparent 58%),
    var(--completion-surface, #102c35);
  box-shadow: 0 0 34px color-mix(in srgb, var(--completion-accent, #f6d365) 35%, transparent), 0 24px 70px rgba(0, 0, 0, 0.65);
  transform: translateY(18px) scale(0.94);
  transition: transform 260ms cubic-bezier(.2, .8, .2, 1);
}

.completion-popup.is-visible .completion-popup__card { transform: translateY(0) scale(1); }

.completion-popup__sparkles {
  color: var(--completion-accent, #f6d365);
  font-size: 1.35rem;
  letter-spacing: .65rem;
  margin-right: -.65rem;
  text-shadow: 0 0 14px currentColor;
}

.completion-popup__title {
  margin: 12px 0 8px;
  color: var(--completion-accent, #f6d365);
  font: 700 clamp(1.8rem, 7vw, 2.5rem)/1.05 Georgia, serif;
}

.completion-popup__message { margin: 0 0 24px; font: 1rem/1.55 Arial, sans-serif; opacity: .92; }

.completion-popup__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.completion-popup__button {
  min-width: 105px;
  padding: 11px 24px;
  border: 1px solid color-mix(in srgb, var(--completion-accent, #f6d365) 72%, white);
  border-radius: 999px;
  color: var(--completion-button-text, #111);
  background: var(--completion-accent, #f6d365);
  box-shadow: 0 6px 22px color-mix(in srgb, var(--completion-accent, #f6d365) 30%, transparent);
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: filter 160ms ease, transform 160ms ease;
}

.completion-popup__button:hover { filter: brightness(1.12); transform: translateY(-2px); }
.completion-popup__button:focus-visible { outline: 3px solid white; outline-offset: 4px; }

@media (prefers-reduced-motion: reduce) {
  .completion-popup, .completion-popup__card, .completion-popup__button { transition: none; }
}