:root{
  --fondo:#16181d;
  --fondo-2:#1d2027;
  --tinta:#e8e6df;
  --tenue:#8b8f99;
  --acento:#c8893f;          /* ámbar cálido, color de dial de radio antigua */
  --borde:rgba(255,255,255,.08);
}

*{box-sizing:border-box;
  -webkit-user-select:none; -moz-user-select:none; -ms-user-select:none; user-select:none;
  -webkit-tap-highlight-color:transparent;}

html,body{height:100%;margin:0;}
body{
  background:
    radial-gradient(120% 90% at 50% -10%, var(--fondo-2), var(--fondo) 60%);
  color:var(--tinta);
  font-family:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;
  display:flex;flex-direction:column;overflow:hidden;
}

/* ---- barra superior ---- */
.barra{
  display:flex;align-items:baseline;justify-content:space-between;gap:1rem;
  padding:.4rem 1.2rem;border-bottom:1px solid var(--borde);
  background:rgba(0,0,0,.18);backdrop-filter:blur(6px);
}
.titulo{
  margin:0;font-size:1.05rem;font-weight:600;letter-spacing:.02em;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.contador{
  font-family:"SFMono-Regular",ui-monospace,Menlo,Consolas,monospace;
  font-size:.85rem;color:var(--tenue);white-space:nowrap;
}
.contador #pagActual{color:var(--acento);}

/* ---- escenario del libro ---- */
.escenario{
  position:relative;flex:1;min-height:0;overflow:hidden;
  display:flex;align-items:center;justify-content:center;
  padding:6px 10px;
}
.flipbook{margin:0 auto;max-width:100%;max-height:100%;}

.cargando{position:absolute;color:var(--tenue);font-size:.95rem;letter-spacing:.04em;}

.vacio{
  color:var(--tenue);text-align:center;line-height:1.7;font-size:1rem;
  border:1px dashed var(--borde);border-radius:12px;padding:2rem 2.4rem;
}
.vacio code{color:var(--acento);font-family:ui-monospace,monospace;}

/* ---- marca de agua opcional encima de las páginas ---- */
.marca-agua{
  position:absolute;inset:0;pointer-events:none;overflow:hidden;
  display:flex;flex-wrap:wrap;align-content:center;justify-content:center;
  gap:3.5rem 4rem;transform:rotate(-28deg) scale(1.4);
}
.marca-agua span{
  color:rgba(255,255,255,.07);font-size:1.1rem;font-weight:600;
  letter-spacing:.12em;white-space:nowrap;text-transform:uppercase;
}

/* ---- controles ---- */
.controles{
  display:flex;gap:.5rem;justify-content:center;flex-wrap:wrap;
  padding:.5rem;border-top:1px solid var(--borde);
  background:rgba(0,0,0,.18);
}
.btn{
  appearance:none;cursor:pointer;
  background:var(--fondo-2);color:var(--tinta);
  border:1px solid var(--borde);border-radius:9px;
  padding:.5rem .9rem;font-size:.9rem;font-family:inherit;
  transition:border-color .15s,color .15s,background .15s;
}
.btn:hover{border-color:var(--acento);color:#fff;}
.btn:active{background:#000;}
.btn:focus-visible{outline:2px solid var(--acento);outline-offset:2px;}
.btn-destacado{background:var(--acento);color:#1a1206;border-color:var(--acento);font-weight:600;}
.btn-destacado:hover{color:#000;filter:brightness(1.08);}
.btn-descarga{background:#2f9e44;border-color:#2f9e44;color:#fff;font-weight:600;text-decoration:none;}
.btn-descarga:hover{background:#37b24d;border-color:#37b24d;color:#fff;}

/* ---- lectura a pantalla completa (lupa) ---- */
.lupa{
  position:fixed;inset:0;z-index:50;background:#0b0c0f;
  display:none;flex-direction:column;
}
.lupa.abierta{display:flex;}
.lupa-barra{
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  padding:.55rem .8rem;background:rgba(0,0,0,.55);border-bottom:1px solid var(--borde);
}
.lupa-info{color:var(--tenue);font-size:.78rem;line-height:1.2;}
.lupa-cerrar{
  appearance:none;cursor:pointer;flex:none;
  background:var(--fondo-2);color:var(--tinta);border:1px solid var(--borde);
  border-radius:8px;padding:.45rem .8rem;font-size:.9rem;font-family:inherit;
}
.lupa-cerrar:hover{border-color:var(--acento);color:#fff;}
.lupa-area{
  flex:1;min-height:0;overflow:auto;-webkit-overflow-scrolling:touch;
  display:flex;justify-content:center;
}
.lupa-area img{display:block;width:100%;max-width:1100px;height:auto;}

/* ---- impresión deshabilitada ---- */
@media print{
  body *{display:none !important;}
  body::after{content:"La impresión de este documento está deshabilitada.";
    display:block;padding:2rem;font-family:sans-serif;}
}

@media (max-width:640px){
  .titulo{font-size:.95rem;}
  .btn{padding:.45rem .7rem;font-size:.82rem;}
  .escenario{padding:.5rem;}
  .lupa-info{display:none;}
}
@media (prefers-reduced-motion:reduce){
  .btn{transition:none;}
}

/* ---- ventana emergente de bienvenida (estilo cristal) ---- */
.aviso{
  position:fixed;inset:0;z-index:100;
  display:flex;align-items:center;justify-content:center;
  padding:1rem;
  background:rgba(8,9,12,.45);
  backdrop-filter:blur(7px);-webkit-backdrop-filter:blur(7px);
  animation:avisoFade .35s ease;
}
.aviso.oculto{display:none;}
@keyframes avisoFade{from{opacity:0}to{opacity:1}}
.aviso-caja{
  position:relative;max-width:540px;width:100%;
  background:linear-gradient(180deg, rgba(40,44,54,.66), rgba(22,24,29,.66));
  backdrop-filter:blur(22px) saturate(1.15);-webkit-backdrop-filter:blur(22px) saturate(1.15);
  border:1px solid rgba(255,255,255,.16);border-radius:20px;
  padding:1.9rem 1.8rem 1.6rem;text-align:center;line-height:1.6;
  box-shadow:0 30px 80px rgba(0,0,0,.55), inset 0 1px 0 rgba(255,255,255,.08);
  animation:avisoPop .35s cubic-bezier(.2,.8,.2,1);
}
@keyframes avisoPop{from{transform:translateY(14px) scale(.97);opacity:0}to{transform:none;opacity:1}}
.aviso-icono{
  width:76px;height:76px;margin:0 auto .8rem;border-radius:50%;
  display:flex;align-items:center;justify-content:center;color:var(--acento);
  background:radial-gradient(circle, rgba(200,137,63,.24), rgba(200,137,63,0) 70%);
}
.aviso-icono svg{width:46px;height:46px;}
.aviso-titulo{
  margin:.1rem 0 .2rem;color:#fff;font-size:1.55rem;font-weight:700;letter-spacing:.16em;
}
.aviso-subtitulo{
  margin:0 0 1.1rem;color:var(--acento);
  font-size:.78rem;font-weight:700;letter-spacing:.24em;text-transform:uppercase;
}
.aviso-texto p{margin:.6rem 0;color:var(--tinta);font-size:.97rem;}
.aviso-wa{
  display:inline-block;margin:1rem 0 .2rem;
  color:#25d366;font-weight:600;text-decoration:none;
  border:1px solid #25d366;border-radius:10px;padding:.55rem 1.1rem;
  transition:background .15s,color .15s;
}
.aviso-wa:hover{background:#25d366;color:#06210f;}
.aviso-btn{
  display:block;width:100%;margin-top:1.2rem;cursor:pointer;
  font-family:inherit;font-weight:700;font-size:1rem;letter-spacing:.02em;
  background:var(--acento);color:#1a1206;border:none;border-radius:11px;padding:.7rem 1.8rem;
  transition:filter .15s;
}
.aviso-btn:hover{filter:brightness(1.08);}
@media (max-width:640px){
  .aviso-caja{padding:1.5rem 1.1rem;}
  .aviso-titulo{font-size:1.3rem;letter-spacing:.12em;}
  .aviso-texto p{font-size:.92rem;}
  .aviso-icono{width:64px;height:64px;}
  .aviso-icono svg{width:38px;height:38px;}
}