/* ─── Envelope Overlay ──────────────────────────────────────── */
.envelope-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: radial-gradient(ellipse at 40% 40%, rgba(247, 231, 206, 0.12) 0%, transparent 60%),
              linear-gradient(160deg, var(--black) 0%, #0e0e0e 50%, #1a160e 100%);
  transition: opacity 0.8s var(--ease-out-expo), visibility 0.8s;
  padding: var(--space-4) var(--space-3);
}

.envelope-overlay--exit {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

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

/* Ambient shimmer particles */
.envelope-overlay__particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.envelope-overlay__particle {
  position: absolute;
  width: 2px;
  height: 2px;
  border-radius: 50%;
  background: var(--champagne-dark);
  opacity: 0;
  animation: particleFloat linear infinite;
}

@keyframes particleFloat {
  0%   { opacity: 0; transform: translateY(0) scale(0.5); }
  20%  { opacity: 0.6; }
  80%  { opacity: 0.3; }
  100% { opacity: 0; transform: translateY(-120px) scale(1.2); }
}

/* ─── Envelope Card ─────────────────────────────────────────── */
.envelope {
  position: relative;
  width: min(320px, 88vw);
  perspective: 700px;
  perspective-origin: 50% 0%;
  margin-bottom: var(--space-4);
  /* Clip bottom so letter doesn't bleed below envelope before opening */
  clip-path: inset(0 -20px 0 -20px);
  transition: clip-path 0s 0.5s; /* release clip just before letter starts rising */
}

.envelope--opened {
  clip-path: inset(-300px -20px 0 -20px); /* allow letter to rise above */
}

.envelope__body {
  position: relative;
  width: 100%;
  padding-top: 62%; /* Golden-ish ratio */
  background: linear-gradient(160deg, var(--champagne-light) 0%, var(--champagne) 60%, var(--champagne-dark) 100%);
  border-radius: 4px;
  box-shadow:
    0 4px 20px rgba(0,0,0,0.5),
    0 1px 0 rgba(255,255,255,0.1) inset,
    0 20px 60px rgba(232, 213, 176, 0.12);
  overflow: visible;
  z-index: 3; /* sits in front of the letter */
}

/* Bottom V-fold flaps */
.envelope__body::before,
.envelope__body::after {
  content: '';
  position: absolute;
  bottom: 0;
  width: 50%;
  height: 54%;
  pointer-events: none;
  z-index: 1;
}

/* Left flap — darker shade + visible crease edge */
.envelope__body::before {
  left: 0;
  clip-path: polygon(0 100%, 0 0, 100% 100%);
  background: linear-gradient(
    135deg,
    rgba(180, 155, 110, 0.35) 0%,
    rgba(200, 175, 130, 0.15) 100%
  );
  box-shadow: inset -1px 0 0 rgba(150, 120, 70, 0.25);
  border-right: 1px solid rgba(160, 130, 80, 0.3);
}

/* Right flap — slightly lighter, mirror of left */
.envelope__body::after {
  right: 0;
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  background: linear-gradient(
    225deg,
    rgba(180, 155, 110, 0.35) 0%,
    rgba(200, 175, 130, 0.15) 100%
  );
  border-left: 1px solid rgba(160, 130, 80, 0.3);
}

/* ─── Flap (top triangle) ───────────────────────────────────── */
.envelope__flap {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 50%;
  background: linear-gradient(160deg, var(--champagne-light) 0%, var(--champagne-dark) 100%);
  clip-path: polygon(0 0, 100% 0, 50% 98%);
  transform-origin: top center;
  z-index: 4;
  transition: transform 1s cubic-bezier(0.25, 1, 0.5, 1),
              opacity 0.3s 0.85s ease;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.envelope--opened .envelope__flap {
  transform: rotateX(-175deg);
  opacity: 0;
}

/* ─── Wax Seal ──────────────────────────────────────────────── */
.envelope__seal {
  position: absolute;
  left: 50%;
  top: 58%;
  transform: translate(-50%, -50%);
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: radial-gradient(circle at 38% 38%, #c9a84c 0%, #8b6914 50%, #6b4f0f 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.4), 0 0 0 2px rgba(201, 168, 76, 0.3);
  z-index: 5;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.envelope__seal::before {
  content: '';
  position: absolute;
  inset: 4px;
  border-radius: 50%;
  border: 1px solid rgba(255, 220, 100, 0.3);
}

.envelope__seal-monogram {
  font-family: var(--font-names);
  font-size: 0.8rem;
  font-weight: 600;
  color: rgba(255, 240, 180, 0.95);
  letter-spacing: 0.05em;
}

.envelope--opened .envelope__seal {
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.5);
  transition-delay: 0.1s;
}

/* ─── Letter Card inside envelope ──────────────────────────── */
/*
 * The letter is a sibling to .envelope__body (not a child).
 * z-index 1 keeps it BEHIND the body (z-index 3) initially.
 * The body's background fully covers the letter.
 * On open the letter rises above the body's top edge — that
 * portion is no longer covered and becomes visible naturally.
 */
.envelope__letter {
  position: absolute;
  top: 2%;
  left: 9%;
  right: 9%;
  height: 96%;
  background: linear-gradient(180deg, #fffef9 0%, #fafaf5 100%);
  border-radius: 2px 2px 1px 1px;
  z-index: 1; /* behind .envelope__body */
  transform: translateY(45%); /* start deep inside envelope */
  transition: transform 1.3s 0.7s var(--ease-out-expo),
              box-shadow 1.3s 0.7s ease;
  box-shadow: 0 2px 8px rgba(0,0,0,0.12);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  overflow: hidden;
}

/* Subtle ruled lines on paper */
.envelope__letter::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    transparent,
    transparent 23px,
    rgba(200, 180, 140, 0.12) 23px,
    rgba(200, 180, 140, 0.12) 24px
  );
  pointer-events: none;
}

/* Top edge fold crease for paper realism */
.envelope__letter::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(180deg, rgba(200,180,140,0.25), transparent);
  pointer-events: none;
}

.envelope--opened .envelope__letter {
  transform: translateY(-52%);
  box-shadow:
    0 -6px 30px rgba(0,0,0,0.18),
    0 2px 8px rgba(0,0,0,0.12);
}

.envelope__letter-inner {
  position: relative; /* above the ::before ruled lines */
  z-index: 1;
  padding: var(--space-4) var(--space-3) var(--space-3);
  text-align: center;
  width: 100%;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.7s 1.4s ease, transform 0.7s 1.4s var(--ease-out-expo);
}

.envelope--opened .envelope__letter-inner {
  opacity: 1;
  transform: translateY(0);
}

.envelope__letter-eyebrow {
  font-family: var(--font-body);
  font-size: 0.6rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.25em;
  color: var(--champagne-dark);
  margin-bottom: 0.5rem;
}

.envelope__letter-names {
  font-family: var(--font-names);
  font-size: clamp(1.3rem, 5vw, 1.6rem);
  font-weight: 600;
  color: var(--black);
  line-height: 1.2;
  margin-bottom: 0.25rem;
}

.envelope__letter-amp {
  font-family: var(--font-script);
  font-size: 1.8em;
  color: var(--champagne-dark);
  display: block;
  margin: -0.15em 0;
}

.envelope__letter-date {
  font-size: 0.65rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: #888;
  margin-top: 0.6rem;
  margin-bottom: 0;
}

/* ─── Open CTA ──────────────────────────────────────────────── */
.envelope__cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  animation: ctaPulse 2.5s ease-in-out infinite;
}

.envelope__open-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.9rem 2.2rem;
  background: var(--champagne);
  color: var(--black);
  border: none;
  border-radius: 2px;
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: 0 4px 24px rgba(247, 231, 206, 0.25);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.envelope__open-btn:hover,
.envelope__open-btn:active {
  background: var(--champagne-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(247, 231, 206, 0.35);
}

.envelope__open-btn svg {
  transition: transform 0.3s var(--ease-out-expo);
}

.envelope__open-btn:hover svg,
.envelope__open-btn:active svg {
  transform: translateY(-3px);
}

.envelope__hint {
  font-size: 0.65rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: rgba(247, 231, 206, 0.4);
}

@keyframes ctaPulse {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

/* ─── Responsive ────────────────────────────────────────────── */
@media (min-width: 480px) {
  .envelope {
    width: 340px;
  }

  .envelope__seal {
    width: 58px;
    height: 58px;
  }

  .envelope__seal-monogram {
    font-size: 0.85rem;
  }
}

@media (min-height: 700px) {
  .envelope {
    margin-bottom: var(--space-6);
  }
}

/* ─── Reduced motion ────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .envelope-overlay {
    display: none !important;
  }
}