/* ========================================================
   3. BÌA THIỆP (ENVELOPE / COVER SCREEN)
   Polaroid nghiêng dán băng hồng, tên viết tay, nút note vàng.
   ======================================================== */
.envelope-screen {
  position: fixed;
  inset: 0;
  z-index: 999;
  display: flex;
  justify-content: center;
  background: var(--page-outer);
  overflow-x: hidden;
  overflow-y: auto;
  transition: opacity 1.6s cubic-bezier(0.4, 0, 0.2, 1), visibility 1.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.invite-opening .envelope-screen,
.invite-open .envelope-screen {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.envelope-box {
  position: relative;
  width: min(100%, var(--cover-width, 900px));
  min-height: 100%;
  background-color: var(--paper);
  background-image: var(--dot-bg);
  background-size: var(--dot-size);
  container-type: inline-size;
  container-name: envelope;
}

.envelope-card {
  --cover-polaroid-w: 250px;
  --cover-names-size: 52px;
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  padding: 48px 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--ink-dark);
  font-family: var(--font-body);
}

/* Web: phóng nhẹ theo bề rộng khung thiệp (tới 900px) */
@supports (width: 1cqi) {
  .envelope-card {
    --cover-polaroid-w: clamp(250px, 64cqi, 320px);
    --cover-names-size: clamp(52px, 13.3cqi, 64px);
  }
}

/* Ảnh polaroid bìa */
.cover-polaroid {
  position: relative;
  width: var(--cover-polaroid-w);
  padding: 12px 12px 56px;
  background: var(--polaroid);
  box-shadow: var(--shadow-lg);
  rotate: -3deg;
}

.cover-polaroid::before {
  content: "";
  position: absolute;
  top: -12px;
  left: 50%;
  z-index: 1;
  width: 96px;
  height: 26px;
  background: var(--tape-pink);
  transform: translateX(-50%) rotate(4deg);
}

.cover-photo {
  aspect-ratio: 1;
}

.envelope-date {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 10px;
  margin: 0;
  font-family: var(--font-hand);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.7;
  font-variant-numeric: lining-nums;
}

/* "THÂN MỜI" + tên khách */
.cover-guest {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: 40px;
}

.cover-guest[hidden] { display: none; }

.cover-guest-label {
  font-size: 11px;
  letter-spacing: 4px;
  line-height: 1.7;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.envelope-invite-text {
  margin-top: 2px;
  max-width: 100%;
  font-family: var(--font-hand);
  font-size: 30px;
  font-weight: 700;
  line-height: 1.7;
  color: var(--accent-red);
  overflow-wrap: anywhere;
}

/* Tên chú rể & cô dâu */
.envelope-names {
  width: 100%;
  margin-top: 14px;
  font-family: var(--font-hand);
  font-size: var(--cover-names-size);
  font-weight: 700;
  line-height: 1.05;
  white-space: nowrap; /* tên đôi luôn một dòng; renderer.js thu nhỏ chữ cho vừa khung */
}

.envelope-name-amp {
  margin: 0 0.18em;
  font-size: 0.654em;
}

.cover-tagline {
  margin: 6px 0 0;
  font-family: var(--font-hand);
  font-size: 22px;
  font-weight: 500;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* Nút mở thiệp: note vàng, bóng cứng */
.btn-open {
  margin-top: 26px;
  min-height: 48px;
  padding: 0 28px;
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  background: var(--note-yellow);
  font-size: 14px;
  line-height: 1.2;
  box-shadow: var(--hard-shadow);
}

.btn-open:hover:not(:disabled) {
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0 var(--ink-dark);
}

.btn-open:active:not(:disabled) {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 var(--ink-dark);
}

/* Khi mở thiệp: polaroid bay lên, chữ mờ dần */
.envelope-card > * {
  transition: opacity 1.1s ease, transform 1.4s cubic-bezier(0.2, 0.8, 0.25, 1), rotate 1.4s cubic-bezier(0.2, 0.8, 0.25, 1);
}

.invite-opening .envelope-card > * {
  opacity: 0;
  transform: translateY(-36px);
}

.invite-opening .cover-polaroid {
  transform: translateY(-80px) scale(0.92);
  rotate: -9deg;
}

/* Loading chỉ phủ bìa trong lúc chờ dữ liệu thiệp */
#envelope-screen .cover-loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: grid;
  place-items: center;
  background: rgba(244, 239, 230, 0.6);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  cursor: wait;
}
#envelope-screen .cover-loading-overlay[hidden] { display: none; }
#envelope-screen .cover-loading-spinner {
  width: 44px;
  height: 44px;
  color: var(--ink-dark);
  border: 3px solid color-mix(in srgb, currentColor 25%, transparent);
  border-top-color: currentColor;
  border-radius: 50%;
  animation: coverLoadingSpin 0.9s linear infinite;
}
@keyframes coverLoadingSpin { to { transform: rotate(360deg); } }
#envelope-screen[aria-busy="true"] { cursor: wait; }
#envelope-screen button:disabled { cursor: wait; }

@media (prefers-reduced-motion: reduce) {
  .envelope-card > * { transition: none; }
}