/* ─────────────────────────────────────────────────────────────────────────
   Visor del Manual teórico · Laboratorio Alycamp
   Mesa de lectura oscura (azul corporativo muy profundo) para que las páginas,
   muy coloridas, sean lo único que brilla. Rojo Alycamp solo como acento.
   ───────────────────────────────────────────────────────────────────────── */
:root {
  --azul: #164090;
  --rojo: #c0003a;
  --noche: #0b1631;
  --noche-2: #13254d;
  --tinta: #eef2fb;
  --tinta-2: #a9b6d6;
  --linea: rgba(255, 255, 255, 0.1);
  --cristal: rgba(11, 22, 49, 0.72);
  --pw: 300px; /* ancho de página, lo fija visor.js */
  --ph: 424px; /* alto de página */
  --fuente: "Outfit", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--noche);
  color: var(--tinta);
  font-family: var(--fuente);
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
  overscroll-behavior: none;
}

/* Contra la descarga casual: sin selección, sin menú de «guardar imagen»,
   sin arrastrar. No es infalible (nada lo es), pero corta el gesto natural. */
.app {
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}
.app img {
  pointer-events: none;
  -webkit-user-drag: none;
  user-select: none;
}

.app {
  position: fixed;
  inset: 0;
  display: grid;
  grid-template-rows: auto 3px minmax(0, 1fr) auto;
  grid-template-columns: minmax(0, 1fr); /* la columna no crece con el libro */
  height: 100dvh;
  background:
    radial-gradient(ellipse 70% 60% at 50% 45%, rgba(46, 86, 170, 0.32), transparent 70%),
    radial-gradient(ellipse 120% 80% at 50% 120%, rgba(192, 0, 58, 0.1), transparent 60%),
    linear-gradient(180deg, var(--noche) 0%, var(--noche-2) 55%, var(--noche) 100%);
}
/* Grano fino de papel sobre todo el fondo */
.app::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.07;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
}

/* ── Barra superior ─────────────────────────────────────────────────────── */
.barra {
  position: relative;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: max(10px, env(safe-area-inset-top)) max(18px, env(safe-area-inset-right)) 10px max(18px, env(safe-area-inset-left));
  border-bottom: 1px solid var(--linea);
  background: linear-gradient(180deg, rgba(11, 22, 49, 0.9), rgba(11, 22, 49, 0.55));
  backdrop-filter: blur(10px);
}
.marca {
  display: flex;
  flex-direction: column;
  line-height: 0.92;
  text-decoration: none;
  text-transform: uppercase;
  flex-shrink: 0;
}
.marca-a { font-weight: 600; font-size: 10.5px; letter-spacing: 0.22em; color: var(--tinta-2); }
.marca-b { font-weight: 800; font-size: 19px; letter-spacing: 0.04em; color: #fff; }
.marca-b::first-letter { color: var(--rojo); }
.titulo {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding-left: 18px;
  border-left: 1px solid var(--linea);
}
.titulo-kicker { font-size: 11px; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase; color: var(--tinta-2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.titulo-main { font-size: 17px; font-weight: 300; letter-spacing: 0.01em; white-space: nowrap; }
.acciones { margin-left: auto; display: flex; align-items: center; gap: 6px; }

.btn-icono {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 40px;
  min-width: 40px;
  padding: 0 10px;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  color: var(--tinta);
  font: 600 14px var(--fuente);
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}
.btn-icono:hover { background: rgba(255, 255, 255, 0.08); border-color: var(--linea); }
.btn-icono svg, .btn-nav svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.btn-examen {
  margin-left: 8px;
  padding: 10px 16px;
  border-radius: 999px;
  background: var(--rojo);
  color: #fff;
  font-weight: 600;
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  box-shadow: 0 6px 18px -6px rgba(192, 0, 58, 0.7);
  transition: transform 0.2s, box-shadow 0.2s;
}
.btn-examen:hover { transform: translateY(-1px); box-shadow: 0 10px 24px -8px rgba(192, 0, 58, 0.85); }
:focus-visible { outline: 2px solid #fff; outline-offset: 2px; }

/* Cinta de progreso: el marcapáginas rojo */
.progreso { position: relative; z-index: 5; background: rgba(255, 255, 255, 0.06); }
.progreso span {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--rojo), #ff4d7d);
  box-shadow: 0 0 12px rgba(255, 77, 125, 0.6);
  transition: width 0.5s cubic-bezier(0.2, 0.7, 0.2, 1);
}

/* ── Escenario y libro ──────────────────────────────────────────────────── */
.escenario {
  position: relative;
  display: grid;
  place-items: center;
  overflow: hidden;
  touch-action: none; /* los gestos los gestiona el visor */
  padding: 18px;
  min-width: 0;
  min-height: 0;
}
.libro {
  position: relative;
  display: flex;
  perspective: 2800px;
  transition: transform 0.6s cubic-bezier(0.3, 0.7, 0.2, 1), opacity 0.6s;
  opacity: 0;
}
.libro.listo { opacity: 1; }
.libro.desplazado-izq { transform: translateX(calc(var(--pw) / -2)); }
.libro.desplazado-der { transform: translateX(calc(var(--pw) / 2)); }

.lado {
  position: relative;
  width: var(--pw);
  height: var(--ph);
}
.lado:empty { pointer-events: none; }

.pagina {
  position: absolute;
  inset: 0;
  overflow: hidden;
  background: #fff;
  border-radius: 2px;
  box-shadow: 0 30px 60px -20px rgba(0, 0, 0, 0.65), 0 4px 10px rgba(0, 0, 0, 0.25);
}
.pagina img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.pagina .previa { filter: blur(6px); transform: scale(1.04); }
.pagina .nitida { opacity: 0; transition: opacity 0.35s; }
.pagina .nitida.cargada { opacity: 1; }

/* Lomo: sombras hacia el centro en doble página */
.modo-doble .lado.izq .pagina { border-radius: 3px 0 0 3px; }
.modo-doble .lado.der .pagina { border-radius: 0 3px 3px 0; }
.modo-doble .lado.izq .pagina::after,
.modo-doble .lado.der .pagina::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: 9%;
  pointer-events: none;
}
.modo-doble .lado.izq .pagina::after { right: 0; background: linear-gradient(90deg, transparent, rgba(0, 0, 0, 0.16)); }
.modo-doble .lado.der .pagina::after { left: 0; background: linear-gradient(270deg, transparent, rgba(0, 0, 0, 0.2)); }
.modo-doble .lado.izq, .modo-doble .lado.der { cursor: pointer; }

/* Hoja que gira (doble página) */
.hoja-giro {
  position: absolute;
  top: 0;
  width: var(--pw);
  height: var(--ph);
  transform-style: preserve-3d;
  z-index: 3;
}
.hoja-giro.desde-der { left: var(--pw); transform-origin: left center; }
.hoja-giro.desde-izq { left: 0; transform-origin: right center; }
.cara {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}
.cara.dorso { transform: rotateY(180deg); }
.cara .pagina { box-shadow: none; }
.cara .sombra-giro {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
}
.hoja-giro.desde-der .frente .sombra-giro { background: linear-gradient(90deg, rgba(0, 0, 0, 0.35), transparent 60%); }
.hoja-giro.desde-der .dorso .sombra-giro { background: linear-gradient(270deg, rgba(0, 0, 0, 0.35), transparent 60%); }
.hoja-giro.desde-izq .frente .sombra-giro { background: linear-gradient(270deg, rgba(0, 0, 0, 0.35), transparent 60%); }
.hoja-giro.desde-izq .dorso .sombra-giro { background: linear-gradient(90deg, rgba(0, 0, 0, 0.35), transparent 60%); }

/* Una página (móvil y tablet en vertical): carril deslizable */
.carril {
  position: relative;
  width: var(--pw);
  height: var(--ph);
}
.carril .ranura {
  position: absolute;
  inset: 0;
  will-change: transform;
}

/* Zonas clicables del índice */
.zona-indice {
  position: absolute;
  border: 0;
  padding: 0;
  margin: 0;
  background: transparent;
  border-radius: 14px;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s;
}
.zona-indice:hover, .zona-indice:focus-visible {
  background: rgba(22, 64, 144, 0.1);
  box-shadow: inset 0 0 0 2px rgba(22, 64, 144, 0.55);
  outline: none;
}

.pista {
  position: absolute;
  bottom: 6px;
  left: 0;
  right: 0;
  margin: 0;
  text-align: center;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--tinta-2);
  opacity: 0;
  transition: opacity 0.6s;
  pointer-events: none;
}
.pista.visible { opacity: 0.85; }

/* ── Pie: navegación ────────────────────────────────────────────────────── */
.pie {
  position: relative;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px max(18px, env(safe-area-inset-right)) max(12px, env(safe-area-inset-bottom)) max(18px, env(safe-area-inset-left));
  border-top: 1px solid var(--linea);
  background: linear-gradient(0deg, rgba(11, 22, 49, 0.92), rgba(11, 22, 49, 0.6));
  backdrop-filter: blur(10px);
}
.btn-nav {
  flex-shrink: 0;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--linea);
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s, opacity 0.2s;
}
.btn-nav:hover:not(:disabled) { background: var(--azul); border-color: transparent; }
.btn-nav:active:not(:disabled) { transform: scale(0.94); }
.btn-nav:disabled { opacity: 0.3; cursor: default; }
.estado {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.estado-pag { font-size: 12px; font-weight: 600; letter-spacing: 0.16em; text-transform: uppercase; color: var(--tinta-2); }
.estado-tit { max-width: 100%; font-size: 15px; font-weight: 400; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* ── Panel de capítulos ─────────────────────────────────────────────────── */
.velo {
  position: fixed;
  inset: 0;
  z-index: 20;
  background: rgba(4, 9, 22, 0.55);
  backdrop-filter: blur(3px);
  animation: aparece 0.25s ease;
}
.capitulos {
  position: fixed;
  z-index: 21;
  top: 0;
  bottom: 0;
  left: 0;
  width: min(420px, 92vw);
  display: flex;
  flex-direction: column;
  background: #f7f8fc;
  color: #14213d;
  box-shadow: 30px 0 80px -20px rgba(0, 0, 0, 0.6);
  animation: entra-izq 0.32s cubic-bezier(0.2, 0.8, 0.2, 1);
  padding-top: env(safe-area-inset-top);
}
.capitulos-cab {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 18px 12px 22px;
  border-bottom: 1px solid #e3e7f1;
}
.capitulos-cab h2 { margin: 0; font-size: 13px; font-weight: 600; letter-spacing: 0.2em; text-transform: uppercase; color: var(--azul); }
.capitulos-cab .btn-icono { color: #14213d; }
.capitulos-cab .btn-icono:hover { background: #e8ecf6; }
.capitulos-lista { list-style: none; margin: 0; padding: 8px 10px 16px; overflow-y: auto; flex: 1; }
.capitulos-lista button {
  width: 100%;
  display: grid;
  grid-template-columns: 46px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 8px 10px;
  border: 0;
  border-radius: 12px;
  background: transparent;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: background 0.15s;
}
.capitulos-lista button:hover { background: #e9eef9; }
.capitulos-lista button[aria-current="page"] { background: #fff; box-shadow: inset 3px 0 0 var(--rojo), 0 4px 14px -8px rgba(22, 64, 144, 0.5); }
.cap-mini {
  width: 46px;
  height: 65px;
  border-radius: 4px;
  object-fit: cover;
  background: #dfe5f2;
  box-shadow: 0 3px 8px -3px rgba(0, 0, 0, 0.35);
}
.cap-txt { display: flex; flex-direction: column; min-width: 0; }
.cap-num { font-size: 11px; font-weight: 800; letter-spacing: 0.12em; text-transform: uppercase; color: var(--rojo); }
.cap-tit { font-size: 14.5px; line-height: 1.25; font-weight: 400; }
.cap-pag { font-size: 12px; color: #6b7794; font-variant-numeric: tabular-nums; }
.btn-examen-bloque { display: block; margin: 0 18px max(18px, env(safe-area-inset-bottom)); text-align: center; }

/* ── Lupa ───────────────────────────────────────────────────────────────── */
.lupa {
  position: fixed;
  inset: 0;
  z-index: 30;
  background: rgba(5, 10, 24, 0.96);
  animation: aparece 0.2s ease;
  touch-action: none;
}
.lupa-vista { position: absolute; inset: 0; overflow: hidden; cursor: grab; }
.lupa-vista.arrastrando { cursor: grabbing; }
.lupa-lienzo {
  position: absolute;
  left: 50%;
  top: 50%;
  transform-origin: center center;
  will-change: transform;
  background: #fff;
}
.lupa-lienzo img { position: absolute; inset: 0; width: 100%; height: 100%; }
.lupa-lienzo .nitida { opacity: 0; transition: opacity 0.3s; }
.lupa-lienzo .nitida.cargada { opacity: 1; }
.lupa-barra {
  position: absolute;
  left: 50%;
  bottom: max(16px, env(safe-area-inset-bottom));
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px;
  border-radius: 999px;
  background: var(--cristal);
  border: 1px solid var(--linea);
  backdrop-filter: blur(12px);
  box-shadow: 0 12px 30px -10px rgba(0, 0, 0, 0.7);
}
.lupa-barra .btn-icono { border-radius: 999px; }
.lupa-pag { min-width: 68px; text-align: center; font-size: 13px; font-weight: 600; letter-spacing: 0.08em; color: var(--tinta-2); font-variant-numeric: tabular-nums; }
.btn-cerrar { margin-left: 4px; background: rgba(255, 255, 255, 0.1); }

.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.sin-js { position: fixed; inset: 0; display: grid; place-items: center; padding: 24px; text-align: center; }
.sin-imprimir { display: none; }

@keyframes aparece { from { opacity: 0; } }
@keyframes entra-izq { from { transform: translateX(-100%); } }

/* ── Adaptación ─────────────────────────────────────────────────────────── */
@media (max-width: 860px) {
  .titulo-kicker { display: none; }
  .btn-txt, .acciones .btn-examen { display: none; }
}
@media (max-width: 560px) {
  .barra { gap: 12px; padding-left: max(14px, env(safe-area-inset-left)); padding-right: max(8px, env(safe-area-inset-right)); }
  .titulo { padding-left: 12px; }
  .titulo-main { font-size: 15px; }
  .marca-b { font-size: 16px; }
  .escenario { padding: 10px; }
  .estado-tit { font-size: 13.5px; }
  .btn-nav { width: 42px; height: 42px; }
  #btn-pantalla { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  .libro, .progreso span, .pagina .nitida { transition: none; }
}

/* Impresión: no se imprime el manual, solo un aviso */
@media print {
  .app, noscript { display: none !important; }
  .sin-imprimir { display: block; font: 16px var(--fuente); color: #000; padding: 40px; }
}