.letter-intro:not([open]) {
  display: none;
}
.letter-intro {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: none;
  max-height: none;
  margin: 0;
  border: 0;
  padding: 0;
  background: var(--cream);
  color: var(--ink);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  transition: opacity 0.26s ease;
}
.letter-intro::backdrop {
  background: var(--cream);
}
.letter-intro.is-leaving {
  opacity: 0;
}
.intro-scene {
  position: relative;
  width: 240px;
  height: 190px;
  margin-bottom: 28px;
}
.intro-envelope {
  position: absolute;
  left: 16px;
  bottom: 0;
  width: 208px;
  height: 130px;
  background: var(--kraft-light);
  clip-path: polygon(0 0, 50% 45%, 100% 0, 100% 100%, 0 100%);
  border-radius: 5px;
  animation: intro-arrive 0.85s cubic-bezier(0.2, 0.7, 0.2, 1) both;
}
.intro-letter {
  position: absolute;
  width: 156px;
  height: 150px;
  left: 42px;
  top: 24px;
  background: var(--ivory);
  padding: 30px 22px;
  transform-origin: bottom center;
  animation: intro-paper 1.7s 0.2s cubic-bezier(0.2, 0.65, 0.25, 1) both;
  box-shadow: 0 4px 24px var(--warm-shadow);
}
.intro-letter span {
  display: block;
  height: 1px;
  background: var(--paper-edge);
  margin: 14px 0;
}
.intro-heart {
  position: absolute;
  left: 105px;
  bottom: 34px;
  font: 38px serif;
  color: var(--orange);
  animation: intro-heart 1.7s ease both;
}
.intro-star {
  position: absolute;
  top: 0;
  right: 0;
  color: var(--kraft);
  font-size: 26px;
  animation: intro-star 2s ease both;
}
.intro-kicker {
  font-family: var(--letter-serif);
  font-size: clamp(20px, 5vw, 28px);
  letter-spacing: 0.12em;
  margin: 8px 20px;
  text-align: center;
}
.intro-caption {
  color: var(--ink-soft);
  font-size: 14px;
  letter-spacing: 0.08em;
}
.intro-skip {
  position: absolute;
  bottom: max(36px, env(safe-area-inset-bottom));
  border: 1px solid var(--paper-edge);
  border-radius: 30px;
  padding: 12px 24px;
  background: var(--ivory);
  color: var(--ink);
  cursor: pointer;
  font: inherit;
}
.intro-skip:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 4px;
}
@keyframes intro-arrive {
  from {
    opacity: 0;
    transform: translateY(26px) rotate(-4deg);
  }
  to {
    opacity: 1;
    transform: translateY(0) rotate(0);
  }
}
@keyframes intro-paper {
  0% {
    opacity: 0;
    transform: translateY(70px) rotate(-7deg);
  }
  30% {
    opacity: 1;
  }
  100% {
    opacity: 1;
    transform: translateY(-16px) rotate(-3deg);
  }
}
@keyframes intro-heart {
  0%,
  25% {
    opacity: 0;
    transform: scale(0.6);
  }
  60%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
}
@keyframes intro-star {
  from {
    opacity: 0;
    transform: translateY(12px) rotate(-30deg);
  }
  to {
    opacity: 1;
    transform: none;
  }
}
@media (prefers-reduced-motion: reduce) {
  .letter-intro {
    display: none;
  }
}

.intro-replay { border: 0; background: transparent; padding: 6px 8px; color: var(--ink-soft); font: 12px/1.5 var(--letter-ui); cursor: pointer; }
.intro-replay:focus-visible { outline: 2px solid var(--orange); outline-offset: 2px; border-radius: 5px; }