/* ── Shared Stripe checkout transition + post-purchase success modal ──────
   Used by the dashboard PAYG envelope-pack and verification-credit flows AND
   the public /pricing/ page PAYG packs (and any future Stripe hand-off).
   Mirrors the Founding Member modal chrome (site/css/founding-modal.css) using
   the design tokens defined in style.css (loaded by both the dashboard and the
   pricing page). Modules: site/js/lib/checkout-transition.js and
   site/js/lib/purchase-success-modal.js.

   Extracted out of dashboard.css so /pricing/ (not a dashboard page) can load
   the same chrome without pulling in the whole dashboard stylesheet — one
   source, no duplication. A global prefers-reduced-motion rule in the host
   stylesheet freezes the spinner + fades. */

/* Redirecting-to-checkout overlay (non-dismissable; navigation imminent). */
.checkout-transition {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay-full, 1000);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: blur(4px);
  opacity: 0;
  transition: opacity 0.2s var(--ease-out, ease);
}

.checkout-transition--visible {
  opacity: 1;
}

.checkout-transition__card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  max-width: 360px;
  width: 100%;
  padding: 32px 28px;
  text-align: center;
  background: var(--color-surface-1);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.checkout-transition__spinner {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent-blue);
  animation: checkout-transition-spin 0.8s linear infinite;
}

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

.checkout-transition__text {
  margin: 0;
  font-size: 0.9375rem;
  font-weight: 500;
  line-height: 1.5;
  color: var(--color-text-secondary);
}

/* Post-purchase success modal. */
.purchase-modal {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay-full, 1000);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: blur(4px);
  opacity: 0;
  transition: opacity 0.3s var(--ease-out, ease);
}

.purchase-modal--visible {
  opacity: 1;
}

.purchase-modal--closing {
  opacity: 0;
}

.purchase-modal__card {
  position: relative;
  max-width: 460px;
  width: 100%;
  padding: 32px 28px 24px;
  background: var(--color-surface-1);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.purchase-modal__close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 32px;
  height: 32px;
  padding: 0;
  background: transparent;
  border: 0;
  color: var(--color-text-muted);
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background 0.15s ease, color 0.15s ease;
}

.purchase-modal__close:hover,
.purchase-modal__close:focus-visible {
  background: var(--color-surface-2);
  color: var(--color-text);
  outline: 2px solid var(--color-accent-blue);
  outline-offset: 1px;
}

.purchase-modal__check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  margin-bottom: 16px;
  border-radius: 50%;
  background: rgba(52, 211, 153, 0.15);
  color: var(--color-success, #34d399);
}

.purchase-modal__badge {
  display: inline-block;
  margin-bottom: 12px;
  padding: 4px 10px;
  background: rgba(52, 211, 153, 0.15);
  color: var(--color-success, #34d399);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-radius: var(--radius-sm);
}

.purchase-modal__heading {
  margin: 0 0 12px;
  font-size: 22px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--color-text);
}

.purchase-modal__lead {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.55;
  color: var(--color-text-secondary);
}

.purchase-modal__detail {
  margin: 0 0 20px;
  padding: 14px 16px;
  text-align: left;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 16px;
  row-gap: 6px;
  font-size: 14px;
}

.purchase-modal__detail dt {
  color: var(--color-text-muted);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  align-self: center;
}

.purchase-modal__detail dd {
  margin: 0;
  color: var(--color-text);
  font-weight: 600;
  text-align: right;
}

.purchase-modal__action {
  display: block;
  width: 100%;
  padding: 12px 20px;
  background: var(--color-accent-blue);
  color: #fff;
  border: 0;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.15s ease;
}

.purchase-modal__action:hover,
.purchase-modal__action:focus-visible {
  filter: brightness(1.1);
  outline: 2px solid var(--color-accent-blue);
  outline-offset: 2px;
}

@media (max-width: 480px) {
  .purchase-modal { padding: 12px; }
  .purchase-modal__card { padding: 24px 20px 20px; }
  .purchase-modal__heading { font-size: 19px; }
}