/* =============================================================
   LYRONE GABRIEL ATLAN — BAR-MITSVA
   Page 1 : ENVELOPPE — version premium
   ============================================================= */

:root {
  /* --- PALETTE LYRONE — charbonneux ambré + parchemin + ors flammes (ACTIF) --- */
  --c-bg-deep:      #050912;
  --c-bg:           #0A1424;
  --c-navy-mid:     #142235;
  --c-navy-soft:    #1F3553;
  --c-gold-deep:    #6B4E10;
  --c-gold-dark:    #8B6914;
  --c-gold:         #C9A24A;
  --c-gold-mid:     #D4B257;
  --c-gold-soft:    #E2BE6B;
  --c-gold-warm:    #F4D88A;
  --c-gold-glow:    #FFF1CC;
  --c-paper-light:  #FFFCF3;
  --c-paper:        #F5EBD0;
  --c-paper-deep:   #E5D4A8;
  --c-cream:        #F5EBD0;
  --c-ink:          #0A1424;

  /* --- Option B — Terre & Or ---
  --c-bg:#3D2817; --c-bg-deep:#1F140B; --c-gold:#E8C887; --c-gold-soft:#F0D9A8; --c-gold-warm:#F7E3B8;
  --c-cream:#FAF6EE; --c-paper:#FAF6EE; --c-ink:#2a1a0a;
  */

  /* --- Option C — Vert sauge moderne ---
  --c-bg:#2D4A3E; --c-bg-deep:#16271F; --c-gold:#C9A961; --c-gold-soft:#E0C68A; --c-gold-warm:#EED9A6;
  --c-cream:#F8F4ED; --c-paper:#F8F4ED; --c-ink:#142019;
  */

  --f-title:   'Cormorant Garamond', Georgia, serif;
  --f-hebrew:  'Frank Ruhl Libre', Georgia, serif;
  --f-body:    'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --f-accent:  'Cinzel', Georgia, serif;

  --s-xs: 4px; --s-sm: 8px; --s-md: 16px; --s-lg: 24px; --s-xl: 40px; --s-2xl: 64px;

  --ease-out:    cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.83, 0, 0.17, 1);
  --ease-back:   cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-soft:   cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body { height: 100%; width: 100%; overflow: hidden; }

body {
  font-family: var(--f-body);
  color: var(--c-cream);
  background: var(--c-bg-deep);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
}

button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

/* =============================================================
   BACKGROUND : dégradé radial + vignette + grain
   ============================================================= */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 45% at 50% 35%,  rgba(244, 216, 138, 0.15) 0%, transparent 55%),
    radial-gradient(ellipse 90% 60% at 50% 30%,  var(--c-navy-mid) 0%, var(--c-bg) 45%, var(--c-bg-deep) 100%);
  z-index: 0;
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 50% 50%, transparent 35%, rgba(0,0,0,0.6) 100%);
  z-index: 0;
  pointer-events: none;
}

/* =============================================================
   GODRAYS — rayons de lumière en arrière-plan
   ============================================================= */
.godrays {
  position: fixed;
  top: -10%;
  left: 50%;
  width: 140%;
  height: 140%;
  transform: translateX(-50%);
  z-index: 1;
  pointer-events: none;
  mix-blend-mode: screen;
  opacity: 0.35;
  filter: blur(2px);
}
.godrays-inner {
  position: absolute;
  top: 0;
  left: 50%;
  width: 100%;
  height: 100%;
  transform: translateX(-50%);
  background:
    conic-gradient(from 180deg at 50% 0%,
      transparent 0deg,
      rgba(201,162,74,0.0) 75deg,
      rgba(201,162,74,0.18) 88deg,
      rgba(226,190,107,0.30) 90deg,
      rgba(201,162,74,0.18) 92deg,
      transparent 105deg,
      transparent 255deg,
      rgba(201,162,74,0.18) 268deg,
      rgba(226,190,107,0.30) 270deg,
      rgba(201,162,74,0.18) 272deg,
      transparent 285deg,
      transparent 360deg);
  animation: godrays-rotate 24s linear infinite;
  transform-origin: 50% 0;
}
@keyframes godrays-rotate {
  from { transform: translateX(-50%) rotate(0deg); }
  to   { transform: translateX(-50%) rotate(360deg); }
}

/* =============================================================
   PARTICULES (canvas plein écran)
   ============================================================= */
#particles {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 2;
  pointer-events: none;
}

/* =============================================================
   AUDIO TOGGLE
   ============================================================= */
.audio-toggle {
  position: fixed;
  top: max(16px, env(safe-area-inset-top));
  right: max(16px, env(safe-area-inset-right));
  z-index: 50;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(201,162,74,0.4);
  color: var(--c-gold);
  display: grid;
  place-items: center;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: transform .35s var(--ease-back), background .25s ease, border-color .25s ease;
}
.audio-toggle:hover {
  transform: scale(1.08) rotate(-5deg);
  background: rgba(201,162,74,0.1);
  border-color: var(--c-gold);
  box-shadow: 0 0 20px rgba(201,162,74,0.3);
}
.audio-toggle:focus-visible { outline: 2px solid var(--c-gold); outline-offset: 3px; }

.audio-toggle .ico-sound-on { display: none; }
.audio-toggle .ico-sound-off { display: block; }
.audio-toggle[aria-pressed="true"] .ico-sound-on  { display: block; animation: wave .6s var(--ease-out); }
.audio-toggle[aria-pressed="true"] .ico-sound-off { display: none; }
@keyframes wave { 0% { transform: scale(0.7); } 60% { transform: scale(1.15); } 100% { transform: scale(1); } }

/* =============================================================
   STAGE
   ============================================================= */
.stage {
  position: relative;
  z-index: 3;
  height: 100vh;
  height: 100dvh;
  width: 100%;
  display: grid;
  place-items: center;
  padding: var(--s-lg);
  perspective: 1600px;
}

.envelope-wrapper {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--s-xl);
  width: 100%;
  max-width: 420px;
  opacity: 0;
  animation: stage-in 1.2s var(--ease-out) .2s forwards;
  transform-style: preserve-3d;
}

@keyframes stage-in {
  from { opacity: 0; transform: translateY(30px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* Halo sous l'enveloppe */
.envelope-wrapper::before {
  content: '';
  position: absolute;
  top: 30%;
  left: 50%;
  width: 110%;
  height: 60%;
  transform: translate(-50%, -50%);
  background: radial-gradient(ellipse 50% 40% at center, rgba(201,162,74,0.18) 0%, transparent 70%);
  filter: blur(20px);
  z-index: -1;
  animation: halo-pulse 4s ease-in-out infinite;
}
@keyframes halo-pulse {
  0%, 100% { opacity: 0.6; transform: translate(-50%, -50%) scale(1); }
  50%      { opacity: 1;   transform: translate(-50%, -50%) scale(1.08); }
}

/* =============================================================
   ENVELOPPE
   ============================================================= */
.envelope {
  position: relative;
  width: min(86vw, 360px);
  aspect-ratio: 1.55 / 1;
  transform-style: preserve-3d;
  animation: levitate 6s ease-in-out 1s infinite alternate;
  transition: transform 1s var(--ease-in-out);
  cursor: pointer;
  --tilt-x: 0deg;
  --tilt-y: 0deg;
}

@keyframes levitate {
  from { transform: translateY(-5px) rotateX(calc(2deg + var(--tilt-x))) rotateY(var(--tilt-y)); }
  to   { transform: translateY(5px)  rotateX(calc(-1deg + var(--tilt-x))) rotateY(var(--tilt-y)); }
}

/* Corps de l'enveloppe — navy du logo, hauteur en lumière chaude */
.envelope-body {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(255,255,255,0.05) 0%, rgba(0,0,0,0.20) 100%),
    linear-gradient(180deg, var(--c-navy-mid) 0%, var(--c-bg-deep) 100%);
  border: 1px solid rgba(201, 162, 74, 0.55);
  border-radius: 8px;
  box-shadow:
    0 40px 80px -25px rgba(0,0,0,0.8),
    0 14px 30px -10px rgba(0,0,0,0.6),
    inset 0 0 0 1px rgba(201, 162, 74, 0.12),
    inset 0 0 120px rgba(0,0,0,0.45),
    inset 0 -30px 60px rgba(244, 216, 138, 0.06);
  overflow: hidden;
}

/* Texture subtile + rappel chaud du logo */
.envelope-body::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 50% 38%, rgba(244, 216, 138, 0.10) 0%, transparent 45%),
    radial-gradient(circle at 20% 30%, rgba(201, 162, 74, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(201, 162, 74, 0.06) 0%, transparent 50%);
  pointer-events: none;
}

/* Lignes diagonales — ors du logo */
.envelope-body::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, transparent 49.5%, rgba(201, 162, 74, 0.25) 49.8%, rgba(201, 162, 74, 0.25) 50.2%, transparent 50.5%),
    linear-gradient(225deg, transparent 49.5%, rgba(201, 162, 74, 0.25) 49.8%, rgba(201, 162, 74, 0.25) 50.2%, transparent 50.5%);
  pointer-events: none;
}

/* Monogramme — désactivé visuellement (le logo prend la vedette) */
.monogram { display: none; }

/* Rabat triangulaire */
.envelope-flap {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 60%;
  background:
    linear-gradient(180deg, #1b3d63 0%, #0e2540 100%);
  border: 1px solid rgba(212, 175, 55, 0.5);
  border-bottom: none;
  clip-path: polygon(0 0, 100% 0, 50% 100%);
  transform-origin: top center;
  transform: rotateX(0deg);
  z-index: 3;
  box-shadow:
    inset 0 -10px 30px rgba(0,0,0,0.5),
    0 4px 10px rgba(0,0,0,0.3);
  transition: transform 1.2s var(--ease-in-out);
  backface-visibility: hidden;
}

.envelope-flap::before {
  content: '';
  position: absolute;
  inset: 0;
  clip-path: polygon(0 0, 100% 0, 50% 100%);
  background:
    linear-gradient(180deg, rgba(201,162,74,0.18) 0%, transparent 30%),
    radial-gradient(ellipse at 50% 0%, rgba(244,216,138,0.15) 0%, transparent 60%);
}

/* Bord doré sur le triangle */
.envelope-flap::after {
  content: '';
  position: absolute;
  inset: 0;
  clip-path: polygon(0 0, 100% 0, 50% 100%);
  background: linear-gradient(180deg, transparent 80%, rgba(201,162,74,0.4) 100%);
}

/* =============================================================
   CACHET — logo Lyrone derrière, couvercles d'or qui se brisent
   ============================================================= */
.seal {
  position: absolute;
  top: 50%;
  left: 50%;
  width: clamp(86px, 22vw, 120px);
  height: clamp(86px, 22vw, 120px);
  transform: translate(-50%, -50%);
  z-index: 4;
  filter: drop-shadow(0 10px 20px rgba(0,0,0,0.65)) drop-shadow(0 0 16px rgba(201,162,74,0.4));
  animation: seal-pulse 2.6s ease-in-out 2s infinite;
}

@keyframes seal-pulse {
  0%, 100% { transform: translate(-50%, -50%) scale(1) rotate(0deg); }
  50%      { transform: translate(-50%, -50%) scale(1.07) rotate(2deg); }
}

/* Halo en forme de flamme (rappel du logo) */
.seal-flame-halo {
  position: absolute;
  top: -25%;
  left: -25%;
  width: 150%;
  height: 150%;
  background:
    radial-gradient(ellipse 35% 60% at 50% 55%,
      rgba(244, 216, 138, 0.35) 0%,
      rgba(201, 162, 74, 0.18) 30%,
      transparent 70%);
  pointer-events: none;
  z-index: 0;
  animation: flame-flicker 3s ease-in-out infinite alternate;
}
@keyframes flame-flicker {
  0%   { transform: scale(1) translateY(0); opacity: 0.85; }
  100% { transform: scale(1.08) translateY(-3px); opacity: 1; }
}

/* Médaillon ivoire (style parchemin) — révélé après bris du cachet */
.seal-base {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 28%, #FFFCF3 0%, #F5EBD0 55%, #E5D4A8 100%);
  z-index: 1;
  opacity: 0;
  transform: scale(0.85);
  transition: opacity .8s var(--ease-out) .2s, transform 1s var(--ease-back) .2s;
  box-shadow:
    inset 0 0 0 3px rgba(11, 27, 46, 0.5),
    inset 0 0 0 4px var(--c-gold),
    inset 0 -10px 24px rgba(120, 90, 30, 0.15),
    inset 0 0 30px rgba(255, 240, 200, 0.4);
  display: grid;
  place-items: center;
  overflow: hidden;
}

/* Texture fibres papier (radial fin) */
.seal-base::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background:
    radial-gradient(circle at 50% 50%,
      transparent 0%,
      transparent 60%,
      rgba(120,90,30,0.1) 100%);
  pointer-events: none;
}

/* Logo dans le cachet — taille adaptée */
.seal-logo {
  position: relative;
  width: 78%;
  height: 78%;
  object-fit: contain;
  z-index: 2;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.15));
}

/* Anneau doré autour */
.seal-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1.5px solid var(--c-gold);
  box-shadow:
    0 0 0 3px rgba(11, 27, 46, 0.5),
    0 0 0 4px rgba(201, 162, 74, 0.4),
    inset 0 0 12px rgba(201,162,74,0.3);
  z-index: 2;
  pointer-events: none;
  transition: transform .8s var(--ease-out), opacity .8s ease;
}

/* Couvercles d'or qui se brisent */
.seal-cover {
  position: absolute;
  top: 0;
  width: 50%;
  height: 100%;
  background:
    radial-gradient(circle at 30% 30%,
      #F4D88A 0%,
      #D8AF4F 25%,
      #B58A2D 55%,
      #6E4F0E 100%);
  z-index: 3;
  overflow: hidden;
  transition: transform 1s var(--ease-in-out), opacity .9s ease;
  box-shadow:
    inset 0 0 14px rgba(255,235,180,0.4),
    inset 0 0 30px rgba(0,0,0,0.3);
}

.seal-cover::before {
  content: '';
  position: absolute;
  inset: 6%;
  border: 1.5px solid rgba(255, 240, 200, 0.55);
  border-radius: 50%;
  pointer-events: none;
}

/* Texture cire (lignes diagonales subtiles) */
.seal-cover::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(45deg,
      transparent 0px, transparent 3px,
      rgba(255,255,255,0.04) 3px, rgba(255,255,255,0.04) 4px);
  pointer-events: none;
}

.seal-cover-left {
  left: 0;
  border-radius: 50% 0 0 50% / 50% 0 0 50%;
  box-shadow:
    inset -4px 0 8px rgba(0,0,0,0.35),
    inset 0 0 14px rgba(255,235,180,0.3);
}
.seal-cover-right {
  right: 0;
  border-radius: 0 50% 50% 0 / 0 50% 50% 0;
  box-shadow:
    inset 4px 0 8px rgba(0,0,0,0.35),
    inset 0 0 14px rgba(255,235,180,0.3);
}

/* Étincelles autour */
.seal-sparkle {
  position: absolute;
  width: 5px;
  height: 5px;
  background: radial-gradient(circle, var(--c-gold-warm), transparent);
  border-radius: 50%;
  pointer-events: none;
  z-index: 5;
  animation: sparkle-orbit 6s linear infinite;
}
.seal-sparkle:nth-child(1) { top: -12%;  left: 50%; animation-delay: 0s;   }
.seal-sparkle:nth-child(2) { top: 20%;   right: -12%; animation-delay: 1s; }
.seal-sparkle:nth-child(3) { bottom: -12%; right: 30%; animation-delay: 2s; }
.seal-sparkle:nth-child(4) { bottom: 20%; left: -12%; animation-delay: 3s; }
.seal-sparkle:nth-child(5) { top: 30%;   left: -10%; animation-delay: 4s; }
.seal-sparkle:nth-child(6) { top: -8%;   right: 25%; animation-delay: 5s; }
@keyframes sparkle-orbit {
  0%, 100% { transform: scale(0); opacity: 0; }
  50%      { transform: scale(1.6); opacity: 1; }
}

/* =============================================================
   CARTE INTÉRIEURE
   ============================================================= */
.card-inside {
  position: absolute;
  top: 8%;
  left: 6%;
  right: 6%;
  bottom: 6%;
  background:
    linear-gradient(135deg, rgba(255,255,255,0.4) 0%, transparent 60%),
    linear-gradient(180deg, var(--c-paper) 0%, var(--c-cream) 100%);
  border: 1px solid rgba(212, 175, 55, 0.6);
  border-radius: 4px;
  z-index: 2;
  display: grid;
  place-items: center;
  text-align: center;
  padding: var(--s-md);
  opacity: 0;
  transform: translateY(0) scale(0.94);
  box-shadow:
    inset 0 0 0 1px rgba(201,162,74,0.2),
    0 14px 36px rgba(0,0,0,0.5);
  transition:
    transform 1.2s var(--ease-out),
    opacity .6s ease;
}

.card-inside-content {
  color: var(--c-ink);
  font-family: var(--f-title);
}

.card-flourish {
  color: var(--c-gold);
  font-size: 14px;
  letter-spacing: 8px;
  margin-bottom: var(--s-sm);
}
.card-tiny {
  font-family: var(--f-accent);
  font-size: 11px;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--c-gold);
}
.card-name {
  font-family: var(--f-title);
  font-weight: 700;
  font-size: clamp(22px, 6vw, 30px);
  margin: 6px 0;
  letter-spacing: 1px;
  color: #2a1d0a;
}

/* =============================================================
   ÉTATS D'OUVERTURE
   ============================================================= */
/* Phase 1 — les 2 demi-cachets d'or se brisent, le médaillon ivoire se révèle */
.envelope.is-breaking .seal-cover-left  { transform: translate(-160%, -20%) rotate(-32deg); opacity: 0; }
.envelope.is-breaking .seal-cover-right { transform: translate( 160%, -20%) rotate( 32deg); opacity: 0; }
.envelope.is-breaking .seal-base        { opacity: 1; transform: scale(1); }
.envelope.is-breaking .seal-ring        { transform: scale(1.08); opacity: 0.8; }

/* Phase 2 — le médaillon entier s'éclipse avec le rabat */
.envelope.is-open .seal-base  { opacity: 0; transform: scale(1.3) translateY(-30%); transition: all .9s var(--ease-in-out); }
.envelope.is-open .seal-ring  { opacity: 0; transform: scale(1.5); }
.envelope.is-open .seal-flame-halo { opacity: 0; transition: opacity .6s ease; }

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

.envelope.is-open .card-inside {
  opacity: 1;
  transform: translateY(-26%) scale(1);
  z-index: 5;
}

.envelope.is-open {
  animation: none;
  transform: translateY(-14px) scale(1.04);
}

/* Flash blanc à l'ouverture */
.flash-overlay {
  position: fixed;
  inset: 0;
  background: white;
  z-index: 100;
  pointer-events: none;
  opacity: 0;
}
.flash-overlay.is-flashing {
  animation: flash 1.2s ease-out forwards;
}
@keyframes flash {
  0%   { opacity: 0; }
  20%  { opacity: 0.6; }
  100% { opacity: 0; }
}

/* =============================================================
   CAPTION
   ============================================================= */
.caption {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  opacity: 0;
  animation: fade-up 1.2s var(--ease-out) 1s forwards;
}

.caption-name {
  font-family: var(--f-title);
  font-weight: 500;
  font-size: clamp(28px, 7vw, 38px);
  background: linear-gradient(180deg, var(--c-cream) 0%, var(--c-gold-soft) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  letter-spacing: 2px;
  line-height: 1;
}

.caption-rule {
  width: 100px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-gold), transparent);
  position: relative;
}
.caption-rule::before,
.caption-rule::after {
  content: '';
  position: absolute;
  top: 50%;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--c-gold);
  transform: translateY(-50%);
}
.caption-rule::before { left: -2px; }
.caption-rule::after  { right: -2px; }

.caption-date {
  font-family: var(--f-accent);
  font-size: 12px;
  letter-spacing: 5px;
  text-transform: uppercase;
  color: var(--c-gold-soft);
}

@keyframes fade-up {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* =============================================================
   BOUTON OUVRIR
   ============================================================= */
.open-btn {
  position: relative;
  padding: 18px 40px;
  font-family: var(--f-accent);
  font-size: 13px;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--c-bg-deep);
  background: linear-gradient(135deg, var(--c-gold-soft) 0%, var(--c-gold) 50%, #b8941f 100%);
  border-radius: 999px;
  overflow: hidden;
  box-shadow:
    0 12px 36px -10px rgba(201,162,74,0.55),
    0 4px 14px rgba(0,0,0,0.35),
    inset 0 1px 0 rgba(255,255,255,0.5);
  opacity: 0;
  transform: translateY(12px);
  animation: fade-up 1.2s var(--ease-out) 2.8s forwards;
  transition: transform .3s var(--ease-out), box-shadow .3s ease;
}

.open-btn::before {
  content: '';
  position: absolute;
  inset: -2px;
  background: conic-gradient(from 0deg, transparent, rgba(244,216,138,0.8), transparent 60%);
  border-radius: 999px;
  animation: btn-rotate 4s linear infinite;
  z-index: 0;
  opacity: 0.5;
}
@keyframes btn-rotate { to { transform: rotate(360deg); } }

.open-btn::after {
  content: '';
  position: absolute;
  inset: 2px;
  background: linear-gradient(135deg, var(--c-gold-soft) 0%, var(--c-gold) 50%, #b8941f 100%);
  border-radius: 999px;
  z-index: 1;
}

.open-btn:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow:
    0 18px 44px -10px rgba(201,162,74,0.7),
    0 6px 18px rgba(0,0,0,0.4),
    inset 0 1px 0 rgba(255,255,255,0.6);
}

.open-btn:focus-visible { outline: 2px solid var(--c-cream); outline-offset: 4px; }
.open-btn:active { transform: translateY(0) scale(0.97); }

.open-btn-label {
  position: relative;
  z-index: 3;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.open-btn-arrow {
  display: inline-block;
  transition: transform .3s var(--ease-out);
}
.open-btn:hover .open-btn-arrow { transform: translateX(4px); }

.open-btn-shine {
  position: absolute;
  top: 0; left: -120%;
  width: 80%;
  height: 100%;
  background: linear-gradient(115deg, transparent 30%, rgba(255,255,255,0.6) 50%, transparent 70%);
  transform: skewX(-20deg);
  animation: shine 3.5s ease-in-out 3.2s infinite;
  z-index: 2;
}
@keyframes shine {
  0%, 55% { left: -120%; }
  100%    { left: 120%; }
}

.open-btn.is-disabled { pointer-events: none; opacity: 0.6; }

/* =============================================================
   SCROLL HINT (petit chevron animé)
   ============================================================= */
.scroll-hint {
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--c-gold);
  opacity: 0;
  animation: fade-up 1s var(--ease-out) 3.4s forwards, bounce-y 2s ease-in-out 4s infinite;
  font-size: 18px;
}
@keyframes bounce-y {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%      { transform: translateX(-50%) translateY(6px); }
}

/* =============================================================
   TRANSITION DE SORTIE
   ============================================================= */
.stage.is-leaving { animation: stage-leave 1s var(--ease-in-out) forwards; }
@keyframes stage-leave {
  to { opacity: 0; transform: scale(1.08); filter: blur(4px); }
}

/* =============================================================
   REDUCED MOTION
   ============================================================= */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .godrays { display: none; }
}

@media (max-width: 360px) {
  .envelope-wrapper { gap: var(--s-lg); }
  .open-btn { padding: 14px 30px; font-size: 12px; letter-spacing: 3px; }
}