/* Lector tipo revista: pliego de dos páginas con vuelta de hoja en 3D. */
.lector { --pw: min(424px, calc(100vw - 100px)); --ph: calc(var(--pw) / 0.707); position: relative; display: grid; grid-template-rows: auto minmax(0, 1fr) auto; grid-template-columns: minmax(0, 1fr); background: #0b0b0c; color: #f5f4f1; border-radius: 24px; overflow: hidden; min-height: 560px; height: min(82vh, 900px); border: 1px solid #26262a; }
.lector--pantalla { position: fixed; inset: 0; z-index: 950; height: 100vh; height: 100dvh; border-radius: 0; border: 0; min-height: 0; }
.cuerpo-lector { overflow: hidden; background: #0b0b0c; }
.cuerpo-lector .lector { position: fixed; inset: 0; height: 100vh; height: 100dvh; border-radius: 0; border: 0; min-height: 0; }
.lector__barra { min-width: 0; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 12px 18px; border-bottom: 1px solid #1f1f22; font-size: 0.86rem; background: rgba(11,11,12,0.9); z-index: 3; }
.lector__volver { color: #bdbab4; display: inline-flex; align-items: center; gap: 8px; }
.lector__volver:hover { color: #fff; }
.lector__titulo { font-family: var(--fuente-display); letter-spacing: 0.08em; text-transform: uppercase; font-size: 0.74rem; color: #bdbab4; text-align: center; flex: 1; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.lector__acciones { display: flex; align-items: center; gap: 8px; }
.lector__acciones button, .lector__acciones a { background: transparent; border: 1px solid #2a2a2e; color: #f5f4f1; border-radius: 999px; padding: 7px 12px; font-size: 0.8rem; display: inline-flex; align-items: center; gap: 6px; transition: border-color 0.2s, background 0.2s; }
.lector__acciones button:hover, .lector__acciones a:hover { border-color: #fff; }
.lector__acciones button[aria-pressed="true"] { background: #fff; color: #0b0b0c; border-color: #fff; }
.lector__contador { font-family: var(--fuente-display); font-size: 0.86rem; color: #bdbab4; min-width: 64px; text-align: center; letter-spacing: 0.06em; }
.lector__escenario { position: relative; min-width: 0; min-height: 0; display: grid; place-items: center; padding: 18px clamp(48px, 6vw, 84px); overflow: hidden; background: radial-gradient(ellipse at center, #1b1b1e 0%, #0b0b0c 70%); touch-action: pan-y; }
.lector__flecha { position: absolute; top: 50%; transform: translateY(-50%); width: 46px; height: 46px; border-radius: 50%; border: 1px solid #2a2a2e; background: rgba(20,20,22,0.85); color: #fff; font-size: 1.5rem; line-height: 1; display: grid; place-items: center; z-index: 4; transition: background 0.2s, border-color 0.2s, opacity 0.2s; }
.lector__flecha:hover { border-color: #fff; background: #0b0b0c; }
.lector__flecha--izq { left: clamp(8px, 1.5vw, 20px); }
.lector__flecha--der { right: clamp(8px, 1.5vw, 20px); }
.lector__flecha[disabled] { opacity: 0.25; pointer-events: none; }

.libro { position: relative; width: calc(var(--pw) * 2); height: var(--ph); perspective: 2600px; transform-style: preserve-3d; filter: drop-shadow(0 30px 60px rgba(0,0,0,0.6)); }
.libro--sola { width: var(--pw); }
.libro__pagina { position: absolute; top: 0; width: var(--pw); height: var(--ph); background: #111; overflow: hidden; }
.libro__pagina--izq { left: 0; border-radius: 6px 0 0 6px; }
.libro__pagina--der { right: 0; border-radius: 0 6px 6px 0; }
.libro--sola .libro__pagina--der { left: 0; border-radius: 6px; }
.libro--sola .libro__pagina--izq { display: none; }
.libro__pagina img, .hoja__cara img { width: 100%; height: 100%; object-fit: cover; display: block; user-select: none; -webkit-user-drag: none; }
.libro__pagina--vacia { background: transparent; box-shadow: none; }
.libro__pagina--vacia img { visibility: hidden; }
/* lomo: sombra en el centro del pliego */
.libro:not(.libro--sola) .libro__pagina--izq::after { content: ''; position: absolute; inset: 0 0 0 auto; width: 14%; background: linear-gradient(90deg, transparent, rgba(0,0,0,0.28)); pointer-events: none; }
.libro:not(.libro--sola) .libro__pagina--der::after { content: ''; position: absolute; inset: 0 auto 0 0; width: 14%; background: linear-gradient(270deg, transparent, rgba(0,0,0,0.28)); pointer-events: none; }
.libro__pagina--vacia::after { display: none; }

.hoja { position: absolute; top: 0; width: var(--pw); height: var(--ph); transform-style: preserve-3d; display: none; z-index: 5; --desde: 0deg; --hasta: -180deg; }
.hoja--activa { display: block; animation: voltear var(--dur, 0.95s) cubic-bezier(0.45, 0.05, 0.25, 1) forwards; }
.hoja--der { right: 0; transform-origin: left center; }
.hoja--izq { left: 0; transform-origin: right center; }
.hoja__cara { position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden; background: #111; overflow: hidden; }
.hoja__cara--dorso { transform: rotateY(180deg); }
.hoja__cara::after { content: ''; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(0,0,0,0.0), rgba(0,0,0,0.55)); opacity: 0; animation: sombra var(--dur, 0.95s) ease-in-out forwards; pointer-events: none; }
.hoja--izq .hoja__cara::after { background: linear-gradient(270deg, rgba(0,0,0,0.0), rgba(0,0,0,0.55)); }
@keyframes voltear { from { transform: rotateY(var(--desde)); } to { transform: rotateY(var(--hasta)); } }
@keyframes sombra { 0% { opacity: 0; } 50% { opacity: 1; } 100% { opacity: 0; } }
.libro--animando .libro__pagina { pointer-events: none; }
.lector__zona { position: absolute; top: 0; bottom: 0; width: 50%; cursor: pointer; z-index: 3; }
.lector__zona--izq { left: 0; } .lector__zona--der { right: 0; }
.lector__zona:hover { background: linear-gradient(90deg, rgba(255,255,255,0.03), transparent); }
.lector__zona--der:hover { background: linear-gradient(270deg, rgba(255,255,255,0.03), transparent); }

.lector__miniaturas { min-width: 0; display: flex; gap: 10px; overflow-x: auto; padding: 12px 18px; border-top: 1px solid #1f1f22; background: #0e0e10; scrollbar-width: thin; z-index: 3; }
.lector__miniaturas button { flex: 0 0 auto; width: 58px; aspect-ratio: 0.707; border: 2px solid transparent; border-radius: 4px; padding: 0; background: #1b1b1e; overflow: hidden; opacity: 0.75; transition: opacity 0.2s, border-color 0.2s, transform 0.2s; }
.lector__miniaturas button img { width: 100%; height: 100%; object-fit: cover; display: block; }
.lector__miniaturas button:hover { opacity: 1; transform: translateY(-2px); }
.lector__miniaturas button[aria-current="true"] { opacity: 1; border-color: var(--acento, #b8955a); }
.lector__pie { display: flex; justify-content: center; align-items: center; gap: 12px; padding: 8px 18px 12px; font-size: 0.78rem; color: #8b8983; }
.lector__ayuda { color: #6f6d68; }
@media (max-width: 720px) {
  .lector { min-height: 480px; height: 78vh; }
  .lector__escenario { padding: 12px 40px; }
  .lector__flecha { width: 38px; height: 38px; }
  .lector__titulo { display: none; }
  .lector__ayuda { display: none; }
  .lector__volver-texto { display: none; }
  .lector__barra { gap: 8px; padding: 10px 12px; }
  .lector__acciones { gap: 6px; }
  .lector__acciones button, .lector__acciones a { padding: 6px 9px; font-size: 0.76rem; }
  .lector__contador { min-width: 0; font-size: 0.8rem; }
}
@media (prefers-reduced-motion: reduce) {
  .hoja--activa { animation-duration: 0.01s; }
  .hoja__cara::after { animation: none; }
}