/* ==========================================================================
   THEME CORE — phần cơ chế dùng chung (tách từ thiệp 21)
   Màn bìa trượt lên, lớp chờ tải, lightbox, nút nổi, modal, toast, màn lỗi.
   Màu lấy từ token trong variables.css; giao diện từng khối nằm ở file theme riêng.
   ========================================================================== */

.envelope-screen {
  position: fixed;
  inset: 0;
  z-index: 900;
  background: var(--vn-outside);
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: stretch;
  visibility: visible;
  opacity: 1;
  transform: translateY(0);
  will-change: transform, opacity;
}

/* Trong lúc kéo bìa: không clip transform (body overflow:hidden hay cắt animation) */
body.invite-opening {
  overflow: visible !important;
}

/* Giống thiệp 14 thư tay: cả màn bìa vuốt trượt từ dưới lên trên */
#envelope-screen.opening,
.envelope-screen.opening {
  background: transparent;
  animation: vnCoverBgSlideUp 2.2s cubic-bezier(0.33, 0.05, 0.2, 1) forwards !important;
  pointer-events: none !important;
  overflow: visible !important;
}

/* Chỉ ẩn hẳn sau khi animation xong (JS gắn .opened, gỡ .opening) */
#envelope-screen.opened:not(.opening),
.envelope-screen.opened:not(.opening),
body.invite-open #envelope-screen:not(.opening) {
  display: none !important;
  opacity: 0 !important;
  visibility: hidden !important;
  pointer-events: none !important;
  animation: none !important;
}

@keyframes vnCoverBgSlideUp {
  0% {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  82% {
    opacity: 1;
    visibility: visible;
  }
  100% {
    transform: translateY(-115vh);
    opacity: 0;
    visibility: hidden;
  }
}

.envelope-box {
  width: min(var(--vn-card-max), 100%);
  min-height: 100%;
  display: flex;
  transform: translateY(0) scale(1);
  will-change: transform, opacity;
}

#envelope-screen.opening .envelope-box,
.envelope-screen.opening .envelope-box {
  animation: vnCoverCardFlyUp 2.2s cubic-bezier(0.28, 0.02, 0.18, 1) forwards !important;
  pointer-events: none !important;
}

/* Thẻ bìa nhích nhẹ cùng màn bìa, không cộng dồn -180vh làm mất hiệu ứng vuốt */
@keyframes vnCoverCardFlyUp {
  0% {
    transform: translateY(0) scale(1);
    opacity: 1;
  }
  100% {
    transform: translateY(-8vh) scale(0.985);
    opacity: 1;
  }
}

/* Lớp chờ tải dữ liệu thiệp trên bìa */
#envelope-screen .cover-loading-overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--vn-red);
}
#envelope-screen .cover-loading-overlay[hidden] { display: none; }
.cover-loading-spinner {
  width: 32px;
  height: 32px;
  border: 2px solid var(--vn-gold-tint);
  border-top-color: var(--vn-gold);
  border-radius: 50%;
  animation: vn-spin .9s linear infinite;
}
@keyframes vn-spin { to { transform: rotate(360deg); } }

/* Lightbox */
.lightbox-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 64px 16px;
  background: var(--vn-overlay-strong);
  opacity: 0;
  visibility: hidden;
  transition: opacity .3s ease, visibility .3s ease;
}
.lightbox-modal.open { opacity: 1; visibility: visible; }
.lightbox-modal img {
  max-width: min(92vw, 720px);
  max-height: 80vh;
  object-fit: contain;
  border: 6px solid var(--vn-red);
  outline: 1px solid var(--vn-gold);
  outline-offset: -6px;
  border-radius: 0;
  box-shadow: none;
}
.lightbox-close,
.lightbox-nav {
  position: absolute;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--vn-gold);
  border-radius: 0;
  background: transparent;
  color: var(--vn-gold-light);
  font-size: 22px;
  line-height: 1;
}
.lightbox-close { top: 16px; right: 16px; font-size: 16px; }
.lightbox-nav { top: 50%; transform: translateY(-50%); font-size: 28px; }
.lightbox-nav.prev { left: 12px; }
.lightbox-nav.next { right: 12px; }
.lightbox-nav[hidden], .lightbox-counter[hidden] { display: none; }
.lightbox-counter {
  position: absolute;
  bottom: 22px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--vn-gold-light);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
}

/* --------------------------------------------------------------------------
   16. NÚT NỔI: NHẠC & NGÔN NGỮ
   -------------------------------------------------------------------------- */
.floating-music {
  position: fixed;
  right: 16px;
  bottom: max(16px, env(safe-area-inset-bottom));
  z-index: 800;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--vn-gold);
  border-radius: 0;
  background: var(--vn-paper-light);
  color: var(--vn-red);
  box-shadow: 0 2px 10px var(--vn-shadow);
  opacity: 0;
  visibility: hidden;
  animation: none !important;
  transform: none !important;
  transition: opacity .4s ease, visibility .4s ease, background-color .25s ease, color .25s ease, border-color .25s ease, box-shadow .25s ease;
}
.invite-open .floating-music { opacity: 1; visibility: visible; }
.floating-music.playing {
  background: var(--vn-red);
  color: var(--vn-gold-light);
  border-color: var(--vn-gold);
  box-shadow: 0 0 0 3px var(--vn-red-tint);
  animation: none !important;
  transform: none !important;
}
.floating-music .music-icon,
.floating-music.playing .music-icon {
  display: flex;
  animation: none !important;
  transform: none !important;
}

.floating-lang { top: 16px; right: 16px; }
.lang-trigger-btn,
.lang-dropdown {
  border: 1px solid var(--vn-gold);
  border-radius: 0;
  background: var(--vn-red);
  box-shadow: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}
.lang-trigger-btn {
  min-height: 36px;
  padding: 0 10px 0 12px;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--vn-gold-light);
}
.lang-trigger-btn:hover,
.floating-lang.is-open .lang-trigger-btn {
  background: var(--vn-red-deep);
  border-color: var(--vn-gold);
  color: var(--vn-gold-light);
  box-shadow: none;
  transform: none;
}
.lang-dropdown { padding: 0; gap: 0; top: calc(100% - 1px); }
.lang-btn {
  min-height: 40px;
  border-radius: 0;
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--vn-paper-light);
}
.lang-btn:hover { background: var(--vn-red-deep); color: var(--vn-gold-light); }
.lang-btn.active { background: var(--vn-gold); color: var(--vn-red-ink); box-shadow: none; }

/* --------------------------------------------------------------------------
   17. MODAL: RSVP, GỢI Ý LỜI CHÚC, HỘP QUÀ
   -------------------------------------------------------------------------- */
.modal-overlay,
.wish-suggestions-modal {
  background: var(--vn-overlay);
  backdrop-filter: none;
}
.wish-suggestions-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  opacity: 0;
  visibility: hidden;
  transition: opacity .3s ease, visibility .3s ease;
}
.wish-suggestions-modal.open { opacity: 1; visibility: visible; }

.modal-box,
.wish-modal-card,
.gift-modal-box {
  width: min(440px, 100%);
  max-height: calc(100dvh - 32px);
  overflow-y: auto;
  padding: 28px 22px 24px;
  background: var(--vn-paper-light);
  border: 2px solid var(--vn-red);
  border-radius: 0;
  outline: 1px solid var(--vn-gold);
  outline-offset: -8px;
  box-shadow: none;
  color: var(--vn-ink);
  text-align: left;
}

.modal-close,
.wish-modal-close,
.gift-modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1.5px solid var(--vn-red);
  border-radius: 0;
  background: var(--vn-paper-light);
  color: var(--vn-red);
  font-size: 14px;
  transform: none;
}
.modal-close:hover,
.wish-modal-close:hover,
.gift-modal-close:hover { background: var(--vn-red); color: var(--vn-paper-light); }

.modal-title,
.wish-modal-title h3,
.gift-modal-title {
  margin: 0 56px 6px 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 26px;
  line-height: 1.25;
  letter-spacing: 0;
  text-transform: none;
  text-align: left;
  color: var(--vn-red);
}
.modal-subtitle,
.wish-modal-subtitle {
  margin: 0 0 18px;
  font-size: 14px;
  color: var(--vn-ink-muted);
  text-align: left;
}

/* RSVP */
.rsvp-modal-box { position: relative; }
.rsvp-form-group { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.rsvp-form-label {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: none;
  color: var(--vn-ink);
}
select.form-input { appearance: auto; }
.rsvp-choices { gap: 8px; margin: 0; }
.rsvp-radio-label {
  min-height: 48px;
  padding: 10px 14px;
  border: 1.5px solid var(--vn-line);
  border-radius: 0;
  background: var(--vn-paper-light);
  font-size: 14px;
}
.rsvp-radio-label:has(input:checked) { border-color: var(--vn-red); background: var(--vn-paper-light); color: var(--vn-ink); box-shadow: inset 0 0 0 1px var(--vn-red); }
.rsvp-radio-label input { accent-color: var(--vn-red); }
.rsvp-btn-submit { width: 100%; margin-top: 6px; }

/* Gợi ý lời chúc */
.wish-modal-card { position: relative; }
.wish-modal-header { display: block; }
.wish-modal-title { display: block; }
.wish-suggestions-list { display: flex; flex-direction: column; gap: 8px; }
.wish-suggestion-item {
  padding: 12px 14px;
  background: var(--vn-paper);
  border: 1px solid var(--vn-line);
  font-size: 15px;
  line-height: 1.55;
  cursor: pointer;
  transition: border-color .2s ease;
}
.wish-suggestion-item:hover { border-color: var(--vn-red); }
.wish-modal-footer { display: flex; gap: 10px; margin-top: 16px; }
.wish-modal-footer button { flex: 1; margin: 0; justify-content: center; }
.btn-modal-cancel {
  min-height: 50px;
  border: 1.5px solid var(--vn-red);
  border-radius: 0;
  background: transparent;
  color: var(--vn-red);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
}
.btn-modal-cancel:hover { background: var(--vn-red-tint); }

/* Hộp quà */
.gift-modal-box { position: relative; display: block; padding: 0; animation: none; }
.gift-modal-header { position: static; padding: 28px 22px 0; background: none; color: var(--vn-ink); text-align: left; }
.gift-modal-body { padding: 18px 22px 24px; background: none; }
.gift-cols-container { gap: 14px; }
.gift-person-card {
  padding: 14px;
  background: var(--vn-paper);
  border: 1px solid var(--vn-gold);
  text-align: center;
  align-items: stretch;
}
.gift-person-title {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--vn-red);
}
.gift-qr-card {
  width: 100%;
  height: auto;
  aspect-ratio: 1;
  margin: 8px 0 12px;
  padding: 6px;
  background: var(--vn-red);
  border: 0;
  border-radius: 0;
  box-shadow: none;
}
.gift-qr-img { background: #FFFFFF; padding: 6px; }
.gift-bank-info { margin-bottom: 10px; }
.gift-bank-name {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--vn-gold-text);
}
.gift-bank-number {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--vn-ink);
  overflow-wrap: anywhere;
}
.gift-bank-owner { font-size: 12px; color: var(--vn-ink-muted); text-transform: uppercase; letter-spacing: 1px; }

@media (max-width: 520px) {
  .gift-modal-box { width: 100%; }
  .gift-modal-title { font-size: 24px; }
  .gift-qr-card { width: 100%; height: auto; padding: 6px; border-radius: 0; }
  .gift-cols-container { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
  .gift-cols-container.single-col { grid-template-columns: 1fr; }
  .gift-person-card { padding: 10px; }
  .gift-bank-number { font-size: 17px; }
}

/* Toast */
.toast {
  border-radius: 0;
  border: 1px solid var(--vn-gold);
  background: var(--vn-red);
  color: var(--vn-paper-light);
  font-size: 14px;
  font-weight: 600;
  padding: 12px 18px;
  box-shadow: none;
}

/* --------------------------------------------------------------------------
   18. MÀN HÌNH LỖI / THIỆP KHÔNG TỒN TẠI
   -------------------------------------------------------------------------- */
.not-found-screen { background: var(--vn-red); }
.not-found-card {
  max-width: 420px;
  padding: 32px 24px;
  background: var(--vn-paper-light);
  border: 2px solid var(--vn-gold);
  outline: 1px solid var(--vn-gold);
  outline-offset: -8px;
  border-radius: 0;
  box-shadow: none;
  text-align: center;
}
.not-found-icon { color: var(--vn-lotus); margin-bottom: 14px; display: flex; justify-content: center; }
.not-found-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 26px;
  color: var(--vn-red);
}
.not-found-desc { font-size: 15px; color: var(--vn-ink-muted); }

/* --------------------------------------------------------------------------
   21. HỘP QUÀ: HAI NÚT TRONG THẺ NGÂN HÀNG
   Xếp dọc, rộng bằng thẻ, cao bằng nhau, chữ không xuống dòng
   -------------------------------------------------------------------------- */
.gift-person-card .gift-actions-row {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 8px;
  margin-top: 4px;
}
.gift-person-card .btn-copy-acc,
.gift-person-card .btn-save-qr {
  width: 100%;
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 12px;
  border: 1.5px solid var(--vn-red);
  border-radius: 0;
  box-shadow: none;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0;
  text-transform: none;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: background .2s ease, color .2s ease;
  transform: none;
}
.gift-person-card .btn-copy-acc svg,
.gift-person-card .btn-save-qr svg { flex: none; }
.gift-person-card .btn-copy-acc { background: var(--vn-red); color: var(--vn-paper-light); }
.gift-person-card .btn-copy-acc:hover { background: var(--vn-red-deep); border-color: var(--vn-red-deep); color: var(--vn-paper-light); transform: none; box-shadow: none; }
.gift-person-card .btn-save-qr { background: transparent; color: var(--vn-red); }
.gift-person-card .btn-save-qr:hover { background: var(--vn-red-tint); color: var(--vn-red); transform: none; box-shadow: none; }
.gift-person-card .btn-copy-acc:active,
.gift-person-card .btn-save-qr:active { transform: none; }