/* ═══════════════════════════════════════════════════════════════════════════
   MEJ · Manual inmersivo v1.0 — Recorrido inmersivo
   Fondo nocturno radial (#101D3A → #0A142B); láminas claras tipo tarjeta
   grande (crema #F4F2EC, radius 22px, sombra profunda) que scrollean sobre
   el fondo. Portada con PARALAJE MULTICAPA estilo Firewatch: el contenedor
   que hace scroll (#mej-viewport) lleva perspective:1px; las capas viven en
   translateZ(-Npx) scale(N+1) con transform-style:preserve-3d en toda la
   cadena y NINGÚN overflow:hidden (aplanaría el 3D). Scroll nativo.
   ═══════════════════════════════════════════════════════════════════════════ */
html, body { height: 100%; overflow: hidden; background: var(--azul-nocturno-hondo); }
body.modo-inmersivo { color: #E6EDF7; }

.saltar { position: fixed; left: 1rem; top: -4rem; z-index: 100; background: var(--dorado-luz); color: var(--azul-nocturno-hondo); padding: .6rem 1rem; border-radius: .5rem; font-weight: 700; }
.saltar:focus { top: 1rem; }

.viewport {
  position: fixed; inset: 0; overflow-y: auto; overflow-x: hidden;
  background: radial-gradient(120% 70% at 70% 0%, #1A2E57 0%, var(--azul-nocturno) 45%, var(--azul-nocturno-hondo) 100%) fixed;
  perspective: 1px; perspective-origin: 50% 0;
  -webkit-overflow-scrolling: touch;
}
.viewport > main, .escena, .lamina.plantilla-portada { transform-style: preserve-3d; }
main:focus { outline: none; }

/* ── Cabecera, progreso y carril ────────────────────────────────────────── */
.cab {
  position: fixed; top: 0; left: 0; right: 0; z-index: 40; height: 58px;
  display: flex; align-items: center; gap: 1rem; padding: 0 clamp(.9rem, 2.4vw, 2rem);
  background: rgba(10, 20, 43, .74); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(201, 162, 39, .18);
}
.cab-marca { display: flex; align-items: center; gap: .6rem; text-decoration: none; color: #fff; }
.cab-iso { width: 38px; height: 38px; display: block; }
.cab-txt { font-family: var(--f-serif); font-weight: 600; letter-spacing: .05em; font-size: 1.05rem; line-height: 1; }
.cab-txt small { display: block; font-family: var(--f-mono); font-weight: 400; font-size: .6rem; letter-spacing: .12em; color: var(--dorado-luz); margin-top: .3rem; }
.cab-escena { margin: 0 auto; font-family: var(--f-mono); font-size: .72rem; letter-spacing: .14em; text-transform: uppercase; color: #9FB3CC; }
.cab-acciones { display: flex; gap: .45rem; }
.btn-cab {
  appearance: none; border: 1px solid rgba(229, 197, 91, .4); background: rgba(255, 255, 255, .04); color: #F3F6FB;
  border-radius: 999px; padding: .42rem .85rem; font-family: var(--f-sans); font-size: .82rem; font-weight: 600; cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; gap: .4rem;
}
.btn-cab:hover, .btn-cab[aria-pressed="true"] { background: var(--dorado-luz); color: var(--azul-nocturno-hondo); border-color: var(--dorado-luz); }
.btn-cab:focus-visible, .rail a:focus-visible { outline: 2px solid var(--dorado-luz); outline-offset: 2px; }
.btn-cab kbd { font-size: .68rem; }
.progreso { position: absolute; left: 0; right: 0; bottom: -1px; height: 2px; background: transparent; }
.progreso span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--azul-tutelas), var(--dorado-luz)); }

.rail { position: fixed; left: .9rem; top: 50%; transform: translateY(-50%); z-index: 30; }
.rail ol { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: .3rem; }
.rail a { display: flex; align-items: center; gap: .55rem; text-decoration: none; color: #9FB3CC; padding: .15rem .3rem; border-radius: .4rem; }
.rail-num { font-family: var(--f-mono); font-size: .66rem; width: 1.6rem; height: 1.6rem; display: grid; place-items: center; border: 1px solid rgba(159, 179, 204, .35); border-radius: 50%; background: rgba(10, 20, 43, .7); }
.rail-tit { font-size: .74rem; opacity: 0; transform: translateX(-.3rem); transition: opacity .2s, transform .2s; white-space: nowrap; background: rgba(10, 20, 43, .85); padding: .15rem .45rem; border-radius: .3rem; }
.rail a:hover .rail-tit, .rail a:focus-visible .rail-tit { opacity: 1; transform: none; }
.rail a[aria-current="true"] .rail-num { background: var(--dorado-luz); color: var(--azul-nocturno-hondo); border-color: var(--dorado-luz); }

/* ── Láminas: tarjetas grandes claras sobre el fondo nocturno ───────────── */
.escena { position: relative; padding-bottom: 7vh; }
.lamina { position: relative; }
.lamina.plantilla-portada { height: 100vh; min-height: 560px; font-size: clamp(12px, 1vw, 15px); background: transparent; }
.lamina.plantilla-portada .portada-texto { padding-top: calc(58px + 3.5vh); }
.lamina.plantilla-portadilla { min-height: 100vh; padding: 96px clamp(1.2rem, 6vw, 6rem) 7vh; font-size: clamp(14px, 1.15vw, 18px); display: flex; align-items: center; }
.lamina.plantilla-portadilla > .porta { width: 100%; max-width: 1280px; margin: 0 auto; }
.lamina.plantilla-libre {
  width: min(1180px, calc(100% - 2 * clamp(1rem, 6vw, 5.5rem))); margin: 0 auto 6vh;
  padding: clamp(1.4rem, 3.2vw, 3rem); border-radius: 22px; color: var(--tinta-mej);
  font-size: clamp(14.5px, 1.02vw, 17px); box-shadow: 0 2.4rem 5rem rgba(10, 20, 43, .5);
  background: var(--crema-papel);
}
.escena > .lamina.plantilla-libre:first-child { margin-top: 96px; }

/* ── Portada: la noche en 6 capas (paralaje con perspectiva CSS) ────────── */
.portada { overflow: visible; transform-style: preserve-3d; }
.portada-fondo, .noche-capas { transform-style: preserve-3d; }
.noche-capas { position: absolute; inset: 0; }
.capa { position: absolute; inset: 0; transform-origin: 50% 0; will-change: transform; }
.capa > svg { width: 100%; height: 100%; }
.capa[data-z="6"] { transform: translateZ(-6px) scale(7); }
.capa[data-z="5"] { transform: translateZ(-5px) scale(6); }
.capa[data-z="4"] { transform: translateZ(-4px) scale(5); }
.capa[data-z="3"] { transform: translateZ(-3px) scale(4); }
.capa[data-z="2"] { transform: translateZ(-2px) scale(3); }
.capa[data-z="1"] { transform: translateZ(-1px) scale(2); }
.portada-texto { transform: translateZ(0); }
.portada-sigue { position: absolute; left: 50%; bottom: 3.2vh; transform: translateX(-50%); z-index: 3; font-family: var(--f-mono); font-size: .72rem; letter-spacing: .3em; text-transform: uppercase; color: var(--dorado-luz); }

/* Revelados: solo si el JS activó la animación (sin JS todo es visible) */
html.anim [data-revelar] { opacity: 0; transform: translateY(18px); }

/* Titulares partidos: las líneas se animan con CSS puro (el reloj virtual de
   las capturas headless avanza las CSS animations hasta el final; un tween
   JS puede quedarse congelado a mitad). Sin recorte: solo fade + rise.
   .mej-asentado (watchdog a los 2,5 s) anula la animación por completo. */
.mej-linea { display: block; animation: mej-linea-subir .85s cubic-bezier(.22, .7, .25, 1) both; }
.mej-linea:nth-child(2) { animation-delay: .09s; }
.mej-linea:nth-child(3) { animation-delay: .18s; }
.mej-linea:nth-child(4) { animation-delay: .27s; }
.mej-linea:nth-child(5) { animation-delay: .36s; }
.mej-linea:nth-child(6) { animation-delay: .45s; }
@keyframes mej-linea-subir {
  from { opacity: 0; transform: translateY(26px); }
  to { opacity: 1; transform: none; }
}
.mej-asentado .mej-linea, .mej-linea.mej-asentado {
  animation: none !important; opacity: 1 !important; transform: none !important;
}

/* ── Índice modal, aviso y pie ──────────────────────────────────────────── */
.indice-modal { position: fixed; inset: 0; z-index: 60; background: rgba(6, 12, 26, .8); backdrop-filter: blur(6px); display: grid; place-items: center; padding: 1rem; }
.indice-modal[hidden] { display: none; }
.indice-caja { width: min(720px, 100%); max-height: 86vh; overflow: auto; background: var(--azul-nocturno); border: 1px solid rgba(201, 162, 39, .3); border-radius: 18px; padding: 1.4rem 1.6rem; }
.indice-cab { display: flex; justify-content: space-between; align-items: center; margin-bottom: .8rem; }
.indice-cab h2 { color: #fff; margin: 0; }
.indice-lista { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: .3rem 1rem; }
.indice-lista a { display: flex; gap: .7rem; padding: .55rem .6rem; border-radius: .5rem; text-decoration: none; color: #E6EDF7; }
.indice-lista a:hover, .indice-lista a:focus-visible { background: rgba(229, 197, 91, .12); outline: none; }
.indice-lista .rail-num { flex: none; }
.indice-lista .rail-tit { opacity: 1; transform: none; background: none; padding: 0; font-size: .95rem; }
.indice-ayuda { margin: 1rem 0 0; font-size: .82rem; color: #9FB3CC; }
.toast { position: fixed; bottom: 1.4rem; left: 50%; transform: translateX(-50%); z-index: 70; background: var(--dorado-luz); color: var(--azul-nocturno-hondo); font-weight: 700; padding: .6rem 1.1rem; border-radius: 999px; font-size: .9rem; }
.toast[hidden] { display: none; }
.pie-inmersivo { text-align: center; padding: 2rem 1rem 3rem; font-family: var(--f-mono); font-size: .72rem; letter-spacing: .1em; color: #6F86A3; }
.swatch:hover .sw-color { filter: brightness(1.06); }

@media (max-width: 1100px) { .rail { display: none; } }
@media (max-width: 820px) {
  .cab { height: 54px; gap: .5rem; }
  .cab-escena, .cab-txt small, .btn-cab kbd { display: none; }
  .btn-cab { padding: .38rem .65rem; font-size: .78rem; }
  .indice-lista { grid-template-columns: 1fr; }
  .lamina.plantilla-libre { border-radius: 16px; }
}

/* ── Movimiento reducido: capas estáticas, sin perspectiva ──────────────── */
@media (prefers-reduced-motion: reduce) {
  .viewport { perspective: none; }
  .capa[data-z] { transform: none !important; }
  .mej-linea { animation: none !important; opacity: 1 !important; transform: none !important; }
}