/* Puerta-Umbral.css */
:root{
  --bg: #080808;
  --ink: #dadada;
  --muted: rgba(218,218,218,.65);
  --line: rgba(248,10,15,.85);     /* #f80a0f */
  --hot: #fd6400;                  /* naranja puertas */
  --glass: rgba(15,15,16,.38);
  --glass2: rgba(15,15,16,.22);
  --shadow: 0 20px 55px rgba(0,0,0,.55);
  --radius: 18px;
}

*{ box-sizing: border-box; }
html, body{ height: 100%; }
body{
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family:system-ui, -apple-system, Ubuntu,BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,  Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  overflow: hidden;
}

/* Escenario */
.stage{
  height: 100%;
  width: 100%;
  display: grid;
  place-items: center;
}

/* Marco 16:9 a pantalla: letterbox garantizado */
.frame{
  position: relative;
  width: 100vw;
  height: 100vh;
  margin: 0;
  background:
    radial-gradient(1200px 600px at 50% 50%, rgba(218,218,218,.06), transparent 55%),
    linear-gradient(180deg, rgba(255,255,255,.03), transparent 30%),
    var(--bg);
  overflow: hidden;
}

/* Imagen: siempre completa sin deformar, respetando 16:9 visual */
.frame__img{
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;  /* letterbox */
  object-position: center center;
  filter: saturate(1.02) contrast(1.02);
  user-select: none;
  -webkit-user-select: none;
  pointer-events: none; /* la interacción la lleva el frame */
}

/* UI superior / inferior */
.ui{
  position: fixed;
  right: 4vw;
  bottom: 4vh;

  display: flex;
  justify-content: flex-end;

  pointer-events: none;
  z-index: 50;
}

.ui button{
  pointer-events: auto;

  width: 58px;
  height: 58px;

  border-radius: 50%;
  border: 1px solid rgba(255,255,255,.25);

  background: rgba(255,255,255,.18);
  backdrop-filter: blur(6px);

  font-size: 1.4rem;
  color: rgba(255,255,255,.92);

  display: flex;
  align-items: center;
  justify-content: center;

  cursor: pointer;

  transition: all .25s ease;
}

.ui button:hover{
  background: rgba(255,255,255,.28);
  transform: scale(1.08);
}

.ui button.is-active{
  background: rgba(248,10,15,.35);
  border-color: rgba(248,10,15,.6);
}

.ui{
  position: absolute;
  left: 0; right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  pointer-events: none; /* solo botones reciben eventos */
}

.ui--top{ top: 0; }
.ui--bottom{ bottom: 0; }

.ui__left, .ui__right{ display: flex; gap: 10px; align-items: center; }
.ui__right{ justify-content: flex-end; }

/* Botones estilo "The Walk" */
.ui__btn,
.ui__back{
  pointer-events: auto;
  text-decoration: none;
  color: var(--ink);
  background: var(--glass);
  border: 1px solid rgba(218,218,218,.22);
  border-radius: 999px;
  padding: 10px 12px;
  line-height: 1;
  font-size: 13px;
  letter-spacing: .06em;
  text-transform: uppercase;
  backdrop-filter: blur(10px);
  box-shadow: 0 10px 28px rgba(0,0,0,.35);
  cursor: pointer;
  transition: transform .12s ease, border-color .12s ease, background .12s ease;
}

.ui__back{
  width: 40px; height: 40px;
  display: inline-grid;
  place-items: center;
  font-size: 16px;
  padding: 0;
}

.ui__btn:hover,
.ui__back:hover{
  transform: translateY(-1px);
  border-color: rgba(253,100,0,.55);
  background: rgba(15,15,16,.48);
}

.ui__btn--door{
  border-color: rgba(248,10,15,.35);
}
.ui__btn--door:hover{
  border-color: rgba(253,100,0,.75);
}

/* Caption inferior */
.caption{
  pointer-events: none;
  display: inline-flex;
  gap: 10px;
  align-items: baseline;
  padding: 10px 12px;
  background: var(--glass2);
  border: 1px solid rgba(218,218,218,.14);
  border-radius: 999px;
  backdrop-filter: blur(10px);
  box-shadow: 0 10px 28px rgba(0,0,0,.25);
}

.caption__title{
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.caption__sep{
  color: rgba(248,10,15,.9);
}
.caption__meta{
  font-size: 12px;
  color: var(--muted);
}

/* Hint sutil */
.hint{
  position: absolute;
  left: 18px;
  top: 64px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 999px;
  background: rgba(15,15,16,.28);
  border: 1px solid rgba(218,218,218,.12);
  backdrop-filter: blur(10px);
}

.hint__dot{
  width: 9px; height: 9px;
  border-radius: 999px;
  background: rgba(253,100,0,.85);
  box-shadow: 0 0 0 3px rgba(253,100,0,.15);
}
.hint__text{
  font-size: 12px;
  letter-spacing: .06em;
  text-transform: lowercase;
  color: rgba(218,218,218,.72);
}

/* Lupa */
.loupe{
  --size: 220px;
  --zoom: 2.6;
  position: absolute;
  width: var(--size);
  height: var(--size);
  border-radius: 999px;
  border: 1px solid rgba(218,218,218,.35);
  box-shadow: var(--shadow);
  background-repeat: no-repeat;
  background-position: 50% 50%;
  background-size: 200% 200%;
  opacity: 0;
  transform: translate(-9999px, -9999px);
  transition: opacity .12s ease;
  pointer-events: none;
  backdrop-filter: blur(2px);
}

/* Apagada */
.loupe--off{
  opacity: 0 !important;
}

/* Responsivo: en móvil hacemos la lupa un poco más pequeña */
@media (max-width: 780px){
  .hint{ top: 58px; }
  .loupe{ --size: 180px; }
  .ui{ padding: 12px 12px; }
  .ui__btn{ font-size: 12px; padding: 9px 11px; }
  .caption__title, .caption__meta{ font-size: 11px; }
}
/* ---------------------------------------
   Tablet
--------------------------------------- */
@media (max-width: 1024px){

  .choice-link{
    bottom: 1.8rem;
    left: 1.8rem;
  }

  .choice-link__a{
    font-size: 1.1rem;
    letter-spacing: 0.05em;
  }

}
/* ---------------------------------------
   Móvil
--------------------------------------- */
@media (max-width: 780px){

  .choice-link{
    bottom: 1.2rem;
    left: 1.2rem;
  }

  .choice-link__a{
    font-size: 0.95rem;
    line-height: 1.3;
    max-width: 60vw;
  }

}


/* Accesibilidad */
:focus-visible{
  outline: 2px solid rgba(253,100,0,.85);
  outline-offset: 3px;
}
/* ---------------------------------------
   Link de elección (abajo izquierda)
--------------------------------------- */

.choice-link{
  position: absolute;
  bottom: 5rem;
  left: 2rem;
  z-index: 5;
}


.choice-link__a{
  font-size: 1.5rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: rgba(255,255,255,0.75);
  transition: color 0.3s ease, transform 0.3s ease;
}

.choice-link__a:hover{
  color: #f80a0f;
  transform: translateX(4px);
}
#Umbral{
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

#franja{
  position:absolute;
  inset:0;
}

.verso{
  position:absolute;
  transform: translate(-50%, -50%);
  white-space: nowrap;
  pointer-events: none;
}