/* Escena inicial a pantalla completa y con el sobre centrado. */
body {
  margin: 0;
  min-width: 320px;
  background: var(--color-bg);
}

#app {
  min-height: 100svh;
}

.opening-scene {
  position: fixed;
  z-index: 1000;
  inset: 0;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 28px;
  padding: 24px;
  overflow: hidden;
  background: radial-gradient(ellipse at center, var(--color-bg-soft), var(--color-bg) 72%);
  opacity: 1;
  transition: opacity 800ms ease;
}

.opening-scene[hidden],
.invitation-container[hidden] {
  display: none !important;
}

.opening-scene--fading {
  opacity: 0;
  pointer-events: none;
}

#envelope-container {
  display: grid;
  place-items: center;
  width: min(100%, 700px);
}

.opening-hint {
  margin: 0;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 2px;
  text-align: center;
  text-transform: uppercase;
  opacity: .8;
  transition: opacity 350ms ease;
}

.opening-scene--fading .opening-hint {
  opacity: 0;
}

.invitation-container {
  opacity: 0;
  transition: opacity 850ms ease;
}

.invitation-container--visible {
  opacity: 1;
}
.envelope-stage {
  width: min(88vw, 620px);
  aspect-ratio: 1.45;
  perspective: 1400px;
  position: relative;
}

.envelope {
  position: relative;
  width: 100%;
  height: 100%;
  cursor: pointer;
  transform-style: preserve-3d;
  transition: transform 1s ease;
}

.envelope:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 8px;
}

.envelope__body {
  position: absolute;
  inset: 0;
  background: linear-gradient(145deg, #68734c, #414b2e);
  border: 1px solid #87906b;
  border-radius: var(--radius);
  box-shadow: 0 25px 55px rgb(0 0 0 / 35%);
  overflow: hidden;
}

.envelope__body::before {
  content: "";
  position: absolute;
  inset: 12px;
  border: 1px solid rgb(212 199 155 / 35%);
  pointer-events: none;
}

.envelope__paper {
  position: absolute;
  width: 72%;
  height: 88%;
  left: 14%;
  top: 6%;
  background: var(--color-paper);
  border: 1px solid #c6b68c;
  box-shadow: 0 10px 25px rgb(0 0 0 / 15%);
  transform: translateX(0) rotateY(0deg);
  transition:
    transform 1.5s cubic-bezier(.2, .7, .2, 1),
    opacity .3s ease;
  z-index: 2;
}

.envelope__paper::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid #b8a77a;
}

.envelope__flap {
  position: absolute;
  z-index: 4;
  inset: 0;
  background: linear-gradient(155deg, #7a8560, #515d38);
  clip-path: polygon(0 0, 100% 0, 50% 60%);
  transform-origin: top center;
  transition: transform 900ms cubic-bezier(.22, .61, .36, 1);
  backface-visibility: hidden;
}

.envelope__side {
  position: absolute;
  z-index: 3;
  top: 0;
  bottom: 0;
  width: 52%;
  background: linear-gradient(90deg, #4d5835, #697650);
  border: 1px solid #87906b;
  transition: transform 1.1s cubic-bezier(.22, .61, .36, 1);
  transform-style: preserve-3d;
}

.envelope__side--left {
  left: 0;
  clip-path: polygon(0 0, 100% 50%, 0 100%);
  transform-origin: left center;
}

.envelope__side--right {
  right: 0;
  clip-path: polygon(100% 0, 0 50%, 100% 100%);
  transform-origin: right center;
}

.envelope__seal {
  position: absolute;
  z-index: 5;
  left: 50%;
  top: 50%;
  width: 62px;
  height: 62px;
  transform: translate(-50%, -50%);
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 2px solid #d6b875;
  background: radial-gradient(circle, #c4a15d, #94713c);
  color: #fff5d7;
  font-family: var(--font-display);
  font-size: 25px;
  box-shadow: 0 5px 15px rgb(0 0 0 / 25%);
  transition: opacity .4s ease, transform .5s ease;
}

.envelope__seal::after {
  content: "M";
  font-size: 25px;
}

/* Estado abierto */

.envelope.is-opening .envelope__flap {
  transform: rotateX(180deg);
}

.envelope.is-opening .envelope__seal {
  opacity: 0;
  transform: translate(-50%, -50%) scale(.6);
}

.envelope.is-opening .envelope__side--left {
  transform: rotateY(-115deg);
}

.envelope.is-opening .envelope__side--right {
  transform: rotateY(115deg);
}

.envelope.is-opening .envelope__paper {
  transform: translateY(-12%) scale(1.04);
}

.envelope.is-open {
  cursor: default;
}

.envelope.is-open .envelope__paper {
  transform: translateY(-10%) scale(1.08);
}

@media (max-width: 420px) {
  .envelope__seal {
    width: 50px;
    height: 50px;
  }
}


.envelope.is-open .envelope__paper {
  transform: translateY(-10%) scale(1.08);
}
@media (max-width: 420px) {
  .envelope__seal {
    width: 50px;
    height: 50px;
  }
}