.letter-intro {
  --invitation-ink: #f5f2ed;
  --invitation-shadow: #171516;
  --invitation-rule: #f5f2ed65;
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  height: 100dvh;
  max-width: none;
  max-height: none;
  margin: 0;
  border: 0;
  outline: none;
  padding: 0;
  overflow: hidden;
  background: var(--invitation-shadow);
  color: var(--invitation-ink);
}
.letter-intro::backdrop {
  background: transparent;
}
.letter-intro[open] {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.invitation-film {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  background: var(--invitation-shadow);
  object-fit: contain;
  pointer-events: none;
}
@media (min-aspect-ratio: 2/5) and (max-aspect-ratio: 1/1) {
  .letter-intro[data-format="portrait"] .invitation-film {
    object-fit: cover;
  }
}
.intro-top,
.intro-bottom {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-inline: max(
    28px,
    env(safe-area-inset-left),
    env(safe-area-inset-right)
  );
  font-size: 11px;
  line-height: 1.5;
  letter-spacing: 0.06em;
  text-shadow: 0 1px 8px var(--invitation-shadow);
}
.intro-top {
  justify-content: flex-end;
  padding-top: max(22px, env(safe-area-inset-top));
  padding-bottom: 20px;
}
.intro-bottom {
  justify-content: center;
  padding-top: 20px;
  padding-bottom: max(24px, env(safe-area-inset-bottom));
}
.intro-skip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 104px;
  min-height: 46px;
  padding: 12px 24px;
  border: 1px solid #f5f2ed78;
  border-radius: 1px;
  background: linear-gradient(180deg, #231f20cc, #121011d9);
  box-shadow:
    inset 0 1px 0 #ffffff14,
    0 12px 30px #00000033;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  color: inherit;
  font: inherit;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  cursor: pointer;
  transition:
    background 180ms,
    border-color 180ms,
    box-shadow 180ms,
    transform 180ms;
}
.intro-skip:hover,
.intro-skip:focus-visible {
  background: linear-gradient(180deg, #30292be6, #171415e6);
  border-color: #f5f2edb8;
  box-shadow:
    inset 0 1px 0 #ffffff1f,
    0 14px 34px #0000004d;
  transform: translateY(-1px);
}
.intro-skip:active {
  transform: translateY(0);
}
.intro-skip:focus-visible {
  outline: 2px solid var(--invitation-ink);
  outline-offset: 4px;
}
.intro-progress {
  width: clamp(36px, 10vw, 140px);
  height: 1px;
  background: currentColor;
  transform-origin: left;
  transform: scaleX(0);
  opacity: 0.65;
}
.intro-open {
  overflow: hidden;
}
@media (max-width: 599px) {
  .intro-top,
  .intro-bottom {
    padding-inline: max(
      18px,
      env(safe-area-inset-left),
      env(safe-area-inset-right)
    );
    font-size: 9px;
  }
}
@media (max-height: 450px) {
  .intro-top,
  .intro-bottom {
    padding-block: max(
      10px,
      env(safe-area-inset-top),
      env(safe-area-inset-bottom)
    );
  }
}
@media (prefers-reduced-motion: reduce) {
  .intro-skip {
    transition: none;
  }
  .letter-intro[open] {
    display: none;
  }
}

/* Couture rouge tracée à la fermeture de l'invitation */
.intro-couture {
  position: fixed;
  top: 50%;
  left: 0;
  z-index: 60;
  width: 100%;
  height: 1px;
  background: #c9181b;
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}