/* ===================================================================
   ENVELOPE STYLES & 3D UNSEALING ANIMATION
   Tactile paper look, 3D rotating flap, silk ribbon, wax seal
   =================================================================== */

.envelope-stage {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  position: relative;
  z-index: 20;
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.envelope-stage.fade-out {
  opacity: 0;
  pointer-events: none;
  transform: translateY(-40px) scale(0.95);
}

.envelope-stage.hidden {
  display: none !important;
}

.envelope-header {
  text-align: center;
  margin-bottom: 30px;
  animation: fadeInDown 1.2s ease backwards;
}

.envelope-header h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  color: var(--text-dark);
  margin-bottom: 8px;
}

.envelope-header p {
  font-size: 1.1rem;
  color: var(--text-muted);
}

/* 3D Envelope Wrapper */
.envelope-wrapper {
  position: relative;
  width: 360px;
  height: 250px;
  perspective: 1200px;
  cursor: pointer;
  animation: floatEnvelope 4s ease-in-out infinite;
  user-select: none;
}

@media (max-width: 420px) {
  .envelope-wrapper {
    width: 310px;
    height: 215px;
  }
}

@keyframes floatEnvelope {

  0%,
  100% {
    transform: translateY(0) rotate(0deg);
  }

  50% {
    transform: translateY(-8px) rotate(0.5deg);
  }
}

/* The Envelope Pocket */
.envelope {
  position: relative;
  width: 100%;
  height: 100%;
  background: #fbf7ee;
  border-radius: 12px;
  box-shadow: 0 25px 50px -12px rgba(90, 60, 60, 0.25), 0 0 0 1px rgba(220, 195, 185, 0.4);
  transform-style: preserve-3d;
  transition: transform 0.6s ease;
  overflow: visible;
}

/* ───────────────────────────────────────────────────────────────────
   SLIDING LETTER PAPER (Rises smoothly from envelope)
   ─────────────────────────────────────────────────────────────────── */
.envelope-letter-paper {
  position: absolute;
  top: 15px;
  left: 20px;
  right: 20px;
  height: 200px;
  background: #fffdf9;
  border-radius: 8px;
  box-shadow: 0 8px 25px rgba(60, 40, 40, 0.12), 0 0 0 1px rgba(220, 200, 190, 0.6);
  z-index: 3;
  padding: 20px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(225, 210, 195, 0.7);
  background-image:
    radial-gradient(#e8ddd3 0.75px, transparent 0.75px),
    linear-gradient(rgba(240, 230, 220, 0.3) 1px, transparent 1px);
  background-size: 16px 16px, 100% 24px;
  transform: translateY(0);
  transition: transform 0.9s cubic-bezier(0.2, 0.8, 0.2, 1), opacity 0.8s ease, filter 0.8s ease;
  pointer-events: none;
}

.letter-paper-seal {
  font-size: 1.6rem;
  margin-bottom: 8px;
}

.letter-paper-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--blush-deep);
  margin-bottom: 4px;
}

.letter-paper-snippet {
  font-family: var(--font-cursive);
  font-size: 1.25rem;
  color: #4a3836;
  line-height: 1.4;
}

/* When envelope opens: 
   Stage 1: Letter paper slides UP out of the pocket */
.envelope-wrapper.is-opening .envelope-letter-paper {
  transform: translateY(-135px);
  box-shadow: 0 20px 45px rgba(60, 40, 40, 0.22);
}

/* Stage 2: Letter expands and transitions into the next page smoothly */
.envelope-wrapper.transitioning-page .envelope-letter-paper {
  transform: translateY(-90px) scale(2.2);
  opacity: 0;
  filter: blur(5px);
  transition: transform 1.1s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.8s ease, filter 0.8s ease;
}

/* Subtle paper texture on the envelope */
.envelope::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.6) 0%, rgba(240, 230, 220, 0.3) 100%);
  pointer-events: none;
}

/* Envelope Flaps */
.envelope-flap {
  position: absolute;
  width: 0;
  height: 0;
  z-index: 3;
}

/* Top folding flap */
.envelope-flap.top {
  top: 0;
  left: 0;
  border-left: 180px solid transparent;
  border-right: 180px solid transparent;
  border-top: 135px solid #f3ece0;
  transform-origin: top center;
  transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  filter: drop-shadow(0 2px 4px rgba(50, 30, 30, 0.08));
  z-index: 6;
}

@media (max-width: 420px) {
  .envelope-flap.top {
    border-left-width: 155px;
    border-right-width: 155px;
    border-top-width: 115px;
  }
}

.envelope-wrapper.is-opening .envelope-flap.top {
  transform: rotateX(180deg);
  z-index: 1;
}

/* Bottom and side decorative folds */
.envelope-pocket-bottom {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 100%;
  border-left: 180px solid #ede3d3;
  border-right: 180px solid #ede3d3;
  border-bottom: 125px solid #e5d8c3;
  border-top: 125px solid transparent;
  border-radius: 0 0 12px 12px;
  z-index: 4;
  pointer-events: none;
}

@media (max-width: 420px) {
  .envelope-pocket-bottom {
    border-left-width: 155px;
    border-right-width: 155px;
    border-bottom-width: 105px;
    border-top-width: 110px;
  }
}

/* Silk Ribbon */
.envelope-ribbon-horizontal {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 28px;
  transform: translateY(-50%);
  background: linear-gradient(90deg, #d47b85 0%, #e88c96 50%, #d47b85 100%);
  box-shadow: 0 2px 6px rgba(180, 70, 80, 0.3);
  z-index: 5;
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.envelope-ribbon-vertical {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 28px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, #d47b85 0%, #e88c96 50%, #d47b85 100%);
  box-shadow: 2px 0 6px rgba(180, 70, 80, 0.2);
  z-index: 5;
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.envelope-wrapper.is-opening .envelope-ribbon-horizontal,
.envelope-wrapper.is-opening .envelope-ribbon-vertical {
  opacity: 0;
  transform: scale(1.1);
}

/* Wax Seal */
.wax-seal {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 68px;
  height: 68px;
  background: radial-gradient(circle at 35% 35%, #b23b49 0%, #871c26 65%, #601018 100%);
  border-radius: 50%;
  box-shadow: 0 6px 18px var(--wax-shadow), inset 0 2px 4px rgba(255, 255, 255, 0.3), inset 0 -3px 6px rgba(0, 0, 0, 0.4);
  z-index: 8;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.3s ease;
}

/* Realistic imperfect melted wax edge */
.wax-seal::before {
  content: "";
  position: absolute;
  inset: -5px;
  border-radius: 52% 48% 54% 46% / 47% 53% 47% 53%;
  background: inherit;
  z-index: -1;
  box-shadow: inherit;
  opacity: 0.9;
}

.wax-seal:hover {
  transform: translate(-50%, -50%) scale(1.08);
  box-shadow: 0 10px 24px var(--wax-shadow);
}

.wax-seal-inner {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1.5px solid rgba(255, 230, 230, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff2f2;
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  text-shadow: 0 -1px 1px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(255, 255, 255, 0.3);
  box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.25);
}

.envelope-wrapper.is-opening .wax-seal {
  transform: translate(-50%, -50%) scale(1.4);
  opacity: 0;
  transition: transform 0.5s ease, opacity 0.4s ease;
}

/* Callout tap badge */
.tap-to-open {
  margin-top: 36px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  animation: pulseTap 2s infinite ease-in-out;
}

.tap-button {
  background: linear-gradient(135deg, var(--blush-400), var(--blush-500));
  color: #ffffff;
  border: none;
  padding: 12px 28px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.3px;
  border-radius: var(--radius-full);
  box-shadow: 0 8px 20px rgba(232, 93, 117, 0.35);
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
}

.tap-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 26px rgba(232, 93, 117, 0.45);
}

.tap-hint {
  font-size: 0.85rem;
  color: var(--text-light);
  font-style: italic;
}

@keyframes pulseTap {

  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.03);
  }
}

@keyframes fadeInDown {
  0% {
    opacity: 0;
    transform: translateY(-20px);
  }

  100% {
    opacity: 1;
    transform: translateY(0);
  }
}