:root {
  color-scheme: dark;
  --papel: #eee3c7;
  --tinta: #30281e;
  --luz: #f4ead4;
  --sombra: rgba(3, 8, 3, .72);
  --transicion: 1800ms;
}
* { box-sizing: border-box; }
html, body { width: 100%; height: 100%; margin: 0; overflow: hidden; background: #0c120b; }
body {
  font-family: Georgia, "Times New Roman", serif;
  color: var(--luz);
  -webkit-tap-highlight-color: transparent;
}
button, input, textarea { font: inherit; }
button { color: inherit; }
.escena {
  position: fixed;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transicion) ease, visibility 0s linear var(--transicion);
  background: #0c120b;
}
.escena--activa {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition-delay: 0s;
  z-index: 2;
}
.escena video,
.escena > img,
.fotograma {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
#video-bosque { filter: brightness(.68) saturate(.92); }
.velo {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to bottom, rgba(3,8,3,.26), rgba(3,8,3,.08) 45%, rgba(3,8,3,.48)),
    radial-gradient(circle at center, transparent 28%, rgba(2,6,2,.28) 100%);
}
.velo--suave { background: linear-gradient(to bottom, rgba(3,8,3,.12), rgba(3,8,3,.28)); }
.velo--mesa { background: linear-gradient(to bottom, rgba(3,8,3,.2), transparent 45%, rgba(3,8,3,.36)); }
.invitacion {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  z-index: 4;
  transition: opacity 900ms ease;
}
.invitacion--oculta { opacity: 0; pointer-events: none; }
.boton-entrada,
.puerta-interactiva,
.zona-carta {
  border: 0;
  background: transparent;
  cursor: pointer;
}
.boton-entrada span,
.puerta-interactiva span,
.zona-carta span {
  display: inline-block;
  padding: .72rem 1rem;
  border-bottom: 1px solid rgba(244,234,212,.72);
  text-shadow: 0 2px 15px #000;
  letter-spacing: .06em;
  font-size: clamp(1rem, 2.4vw, 1.35rem);
  animation: respirar 2.8s ease-in-out infinite;
}
.texto-intro,
.texto-camino,
.texto-mesa,
.despedida {
  position: absolute;
  z-index: 3;
  left: max(7vw, 1.4rem);
  right: max(7vw, 1.4rem);
  bottom: max(8vh, 2rem);
  max-width: 680px;
  text-shadow: 0 2px 18px #000, 0 1px 3px #000;
  pointer-events: none;
}
.texto-intro p,
.texto-camino p,
.texto-mesa p,
.despedida p {
  margin: .22em 0;
  opacity: 0;
  transform: translateY(7px);
  font-size: clamp(1.05rem, 2.35vw, 1.55rem);
  line-height: 1.42;
  transition: opacity 1.4s ease, transform 1.4s ease;
}
p.visible { opacity: 1; transform: translateY(0); }
.fotograma { opacity: 0; transition: opacity 3200ms ease-in-out; }
.fotograma--activo { opacity: 1; }
.puerta-interactiva {
  position: absolute;
  z-index: 5;
  inset: 0;
  opacity: 0;
  pointer-events: none;
  display: grid;
  place-items: center;
  transition: opacity 1200ms ease;
}
.puerta-interactiva--activa { opacity: 1; pointer-events: auto; }
.puerta-interactiva span { margin-top: 48vh; }
#escena-apertura img { animation: acercar 5s ease-out both; }
.texto-mesa {
  top: max(7vh, 2rem);
  bottom: auto;
  max-width: 760px;
}
.zona-carta {
  position: absolute;
  z-index: 5;
  left: 18%;
  top: 46%;
  width: 36%;
  height: 42%;
  display: grid;
  place-items: end center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 900ms ease;
}
.zona-carta--activa { opacity: 1; pointer-events: auto; }
.zona-carta span {
  margin-bottom: 8%;
  font-size: clamp(.9rem, 1.8vw, 1.1rem);
}
.carta {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: max(2vh, .8rem);
  background: rgba(4, 8, 4, .64);
  backdrop-filter: blur(5px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 1100ms ease, visibility 0s linear 1100ms;
}
.carta--abierta {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition-delay: 0s;
}
.carta__papel {
  position: relative;
  width: min(760px, 96vw);
  max-height: 95dvh;
  overflow: auto;
  padding: clamp(1.25rem, 4vw, 3.6rem);
  color: var(--tinta);
  background:
    repeating-linear-gradient(to bottom, transparent 0, transparent 2rem, rgba(70,76,71,.15) 2.04rem),
    linear-gradient(100deg, rgba(130,101,62,.08), transparent 16%, rgba(255,255,255,.22) 50%, transparent 82%),
    var(--papel);
  box-shadow: 0 25px 70px rgba(0,0,0,.58);
  transform: translateY(22px) scale(.97);
  transition: transform 1100ms cubic-bezier(.2,.75,.2,1);
}
.carta--abierta .carta__papel { transform: translateY(0) scale(1); }
.carta__papel h1 {
  margin: 0 2rem 1.5rem 0;
  font-size: clamp(1.55rem, 4vw, 2.35rem);
  font-weight: normal;
}
.carta__cerrar {
  position: absolute;
  top: .55rem;
  right: .75rem;
  border: 0;
  background: transparent;
  color: #5b4d3a;
  font-size: 2rem;
  cursor: pointer;
}
form { display: grid; gap: 1rem; }
label { display: grid; gap: .28rem; }
label span { font-size: .98rem; }
input, textarea {
  width: 100%;
  border: 0;
  border-bottom: 1px solid rgba(48,40,30,.4);
  border-radius: 0;
  outline: 0;
  padding: .5rem .2rem;
  color: var(--tinta);
  background: rgba(255,255,255,.08);
}
input:focus, textarea:focus { border-bottom-color: var(--tinta); background: rgba(255,255,255,.2); }
textarea { min-height: 170px; resize: vertical; line-height: 1.55; }
.nota-correo { margin: 0; font-size: .88rem; line-height: 1.45; opacity: .78; }
.dejar-carta {
  justify-self: start;
  margin-top: .4rem;
  padding: .7rem 0 .35rem;
  border: 0;
  border-bottom: 1px solid var(--tinta);
  background: transparent;
  color: var(--tinta);
  cursor: pointer;
}
.dejar-carta:disabled { opacity: .45; cursor: wait; }
.estado { min-height: 1.3em; margin: 0; font-size: .9rem; }
.trampa { position: absolute !important; left: -10000px !important; }
.escena--final .noche {
  position: absolute;
  inset: 0;
  background: rgba(4,9,7,.82);
  animation: caerLaNoche 12s ease both;
}
.despedida { top: 50%; bottom: auto; transform: translateY(-50%); }
.sonido {
  position: fixed;
  z-index: 40;
  top: max(env(safe-area-inset-top), .8rem);
  right: max(env(safe-area-inset-right), .8rem);
  width: 2.8rem;
  height: 2.8rem;
  border: 1px solid rgba(244,234,212,.35);
  border-radius: 50%;
  background: rgba(5,10,5,.28);
  backdrop-filter: blur(4px);
  cursor: pointer;
  opacity: .72;
}
.sonido--mudo { opacity: .4; }
@keyframes respirar { 50% { opacity: .58; } }
@keyframes acercar { from { transform: scale(1); } to { transform: scale(1.055); } }
@keyframes caerLaNoche { from { opacity: .2; } to { opacity: 1; } }

@media (max-width: 720px) {
  .texto-intro, .texto-camino, .texto-mesa, .despedida { left: 1.2rem; right: 1.2rem; }
  .texto-mesa { top: 5.5rem; }
  .zona-carta { left: 10%; top: 48%; width: 52%; height: 38%; }
  .carta__papel { padding: 1.4rem; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}