/* =============================================================================
   Storefront — generic modal
   Used by: index.html (#confirmModal, #addressModal, #guestUpgradeModal, etc.)

   Structure: .modal-overlay (fixed full-screen backdrop) > .modal (card)
              > .modal-header / .modal-body / .modal-footer

   IMPORTANT — mobile scroll behavior:
   On desktop the .modal has max-height: 90vh; overflow-y: auto so the card
   itself scrolls. On phones (≤768px) we INVERT that: the overlay scrolls
   instead, and the modal grows naturally. The reason is iOS Safari — when
   the on-screen keyboard appears with focus inside an input in a max-height
   card with overflow:auto, the contained-scroll-area frequently refuses to
   scroll and the bottom of the form ends up hidden behind the keyboard. The
   overlay-scrolls pattern behaves like a regular page form which iOS handles
   correctly. (We hit this exact bug in checkout — see git history.)
   ============================================================================= */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}
/* Address modal can be opened from inside the payment modal (z-index 3000),
   so it needs to stack above. */
#addressModal.modal-overlay { z-index: 3500; }
.modal-overlay.open { opacity: 1; visibility: visible; }

.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.95);
  transition: var(--transition);
}
.modal-overlay.open .modal { transform: scale(1); }

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
}
.modal-title { font-family: var(--font-display); font-size: 1.25rem; font-weight: 700; }
.modal-close { font-size: 1.25rem; cursor: pointer; color: var(--text-muted); transition: var(--transition); }
.modal-close:hover { color: var(--danger); }
.modal-body { padding: 1.5rem; }
.modal-footer {
  display: flex;
  gap: 0.75rem;
  justify-content: flex-end;
  padding: 1.5rem;
  border-top: 1px solid var(--border);
}

@media (max-width: 768px) {
  .modal-overlay {
    align-items: flex-start;
    padding: 0.5rem;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
  .modal {
    max-height: none;
    overflow-y: visible;
    margin: 0.5rem auto;
    max-width: 100%;
  }
  .modal-header { padding: 1rem 1.25rem; position: sticky; top: 0; background: var(--surface); z-index: 1; }
  .modal-body { padding: 1.25rem; }
  .modal-footer { padding: 1rem 1.25rem; flex-direction: column-reverse; gap: 0.6rem; }
  .modal-footer .btn { width: 100%; }
}

@media (max-width: 480px) {
  .modal-body { padding: 1rem; }
  .modal-header { padding: 0.9rem 1rem; }
  .modal-footer { padding: 0.9rem 1rem; }
  .modal-title { font-size: 1.05rem; }
}