:root{
  --bg:#f6f2e9; --paper:#fffdf8; --ink:#26221c; --muted:#6b6459;
  --rule:#d9d0bf; --accent:#7a1f1f; --accent-ink:#fff;
  --measure:38rem; --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,"Noto Sans",sans-serif;
  --chrome-h:2.55rem;
}
@media (prefers-color-scheme:dark){
  :root{
    --bg:#16150f; --paper:#1e1c15; --ink:#e7e1d3; --muted:#a49c8b;
    --rule:#3a3730; --accent:#d98c8c; --accent-ink:#1e1c15;
  }
}
@media (prefers-contrast:more){
  :root{--rule:#8a8172; --muted:#4a453c}
  @media (prefers-color-scheme:dark){:root{--rule:#8f8674; --muted:#c9c2b2}}
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0; background:var(--bg); color:var(--ink);
  font:1.19rem/1.75 Georgia,"Iowan Old Style","Palatino Linotype",Palatino,"Times New Roman",serif;
  font-feature-settings:"liga" 1,"onum" 1;
}
a{color:inherit}
a:hover{color:var(--accent)}
img{max-width:100%;height:auto}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:2px}

.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip{position:fixed;top:.5rem;left:.5rem;z-index:60;background:var(--accent);
  color:var(--accent-ink);padding:.6rem 1rem;border-radius:4px;text-decoration:none;
  font-family:var(--sans);font-size:.9rem;transform:translateY(-160%);transition:transform .15s}
.skip:focus{transform:none;color:var(--accent-ink)}

/* progreso de lectura dentro del capítulo */
.leer-progreso{position:fixed;left:0;top:0;height:3px;width:0;background:var(--accent);
  z-index:50;transition:width .1s linear}

/* cabecera fija: barra + progreso del libro */
.chrome{position:sticky;top:0;z-index:40;
  background:var(--bg);
  background:color-mix(in srgb,var(--bg) 90%,transparent);
  -webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);
  border-bottom:1px solid var(--rule)}
.topbar{display:flex;justify-content:space-between;align-items:center;gap:1rem;
  min-height:var(--chrome-h);padding:.4rem clamp(1rem,4vw,2rem);
  font-family:var(--sans);font-size:.82rem;letter-spacing:.02em}
.topbar a{text-decoration:none;color:var(--muted)}
.topbar a:hover{color:var(--accent)}
.topbar .home{font-weight:600;color:var(--ink)}
.topbar .count{white-space:nowrap;color:var(--muted)}

.libro-progreso{padding:0 clamp(1rem,4vw,2rem) .4rem}
.libro-progreso ol{list-style:none;display:flex;gap:3px;margin:0;padding:0}
.libro-progreso li{flex:1;display:flex}
.libro-progreso a{flex:1;height:5px;border-radius:3px;background:var(--rule);
  transition:height .12s,background .12s}
.libro-progreso a[data-done]{background:color-mix(in srgb,var(--accent) 42%,var(--rule))}
.libro-progreso a[aria-current]{background:var(--accent);height:7px}
.libro-progreso a:hover,.libro-progreso a:focus-visible{height:9px}

main{max-width:var(--measure);margin:0 auto;
  padding:clamp(1.6rem,5vw,3.5rem) clamp(1.1rem,5vw,1.6rem) 4rem}
main:focus{outline:none}
.chap-num{font-family:var(--sans);font-size:.8rem;letter-spacing:.18em;
  text-transform:uppercase;color:var(--accent);margin:0 0 .4rem}
h1{font-size:clamp(1.9rem,5vw,2.7rem);line-height:1.15;margin:.1rem 0 1.4rem;font-weight:700;
  scroll-margin-top:calc(var(--chrome-h) + 1.5rem)}
h2{font-size:1.5rem;line-height:1.25;margin:2.8rem 0 .9rem;font-weight:700;
  scroll-margin-top:calc(var(--chrome-h) + 1.5rem)}
h3{font-family:var(--sans);font-size:.92rem;letter-spacing:.08em;text-transform:uppercase;
  color:var(--muted);margin:2.2rem 0 .6rem;font-weight:600;
  scroll-margin-top:calc(var(--chrome-h) + 1.5rem)}
p{margin:0 0 1.15rem}
u{text-decoration-thickness:.06em;text-underline-offset:.14em}
.omitido{color:var(--muted);text-align:center;letter-spacing:.3em;margin:1.6rem 0}
.premisas{margin:1.2rem 0;padding-left:1.6rem}
.premisas li{margin:0 0 1rem}
.premisa-tit{margin:0 0 .4rem;font-weight:700}
.subtitulo{font-variant:small-caps;letter-spacing:.03em;color:var(--muted);margin:.2rem 0 1rem}
@media (max-width:480px){p{hyphens:auto;-webkit-hyphens:auto}}

/* lámina alegórica de cabecera de capítulo */
.lamina{margin:2.2rem 0 2.8rem}
.lamina img{display:block;width:100%;height:auto;border-radius:2px;
  box-shadow:0 2px 16px rgba(0,0,0,.22)}
.lamina figcaption{font-family:var(--sans);font-size:.75rem;line-height:1.5;
  letter-spacing:.09em;text-transform:uppercase;color:var(--muted);
  margin-top:.7rem;text-align:center}

/* flechas laterales (pantallas anchas) */
.rail{position:fixed;top:50%;transform:translateY(-50%);z-index:30;
  display:none;flex-direction:column;align-items:center;justify-content:center;gap:.15rem;
  width:3.4rem;height:4.2rem;padding:0;
  border:1px solid var(--rule);border-radius:14px;
  background:var(--paper);color:var(--muted);text-decoration:none;
  font-family:var(--sans);box-shadow:0 1px 12px rgba(0,0,0,.12);
  transition:color .12s,border-color .12s,background .12s}
.rail:hover,.rail:focus-visible{color:var(--accent);border-color:var(--accent);
  background:color-mix(in srgb,var(--accent) 8%,var(--paper))}
.rail-i{font-size:1.4rem;line-height:1}
.rail-k{font-size:.58rem;letter-spacing:.1em;text-transform:uppercase}
.rail-prev{left:clamp(1.4rem,calc((100vw - var(--measure)) / 2 - 5rem),9rem)}
.rail-next{right:clamp(1.4rem,calc((100vw - var(--measure)) / 2 - 5rem),9rem)}
@media (min-width:1200px){.rail{display:inline-flex}}

/* barra inferior (móvil / tablet) */
.barra{position:fixed;left:0;right:0;bottom:0;z-index:30;display:flex;
  border-top:1px solid var(--rule);
  background:var(--bg);
  background:color-mix(in srgb,var(--bg) 92%,transparent);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  padding-bottom:env(safe-area-inset-bottom);
  font-family:var(--sans);transition:transform .25s ease}
.barra.oculta{transform:translateY(115%)}
.barra-cell{flex:1;min-width:0;min-height:3.25rem;display:flex;align-items:center;
  justify-content:center;gap:.45rem;padding:.5rem .7rem;overflow:hidden;
  text-decoration:none;color:var(--ink);font-size:.9rem}
.barra-cell+.barra-cell{border-left:1px solid var(--rule)}
.barra-cell.mid{flex:0 0 auto;min-width:3.25rem;color:var(--muted);
  font-size:.82rem;font-variant-numeric:tabular-nums}
.barra-i{font-size:1.2rem;line-height:1;color:var(--accent);flex:none}
.barra-x{display:flex;flex-direction:column;min-width:0;flex:0 1 auto}
.barra-x small{font-size:.62rem;letter-spacing:.12em;text-transform:uppercase;color:var(--accent)}
.barra-t{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.barra-cell.next{justify-content:flex-end}
.barra-cell.next .barra-x{align-items:flex-end}
@media (min-width:1200px){.barra{display:none}}
@media (max-width:1199px){body{padding-bottom:calc(4.75rem + env(safe-area-inset-bottom))}}

/* navegación grande al final del capítulo */
.fin-nav{margin-top:3.5rem;border-top:1px solid var(--rule);padding-top:1.6rem;
  display:grid;gap:.9rem;font-family:var(--sans)}
.fin-card{display:flex;flex-direction:column;gap:.35rem;
  padding:1rem 1.15rem;border:1px solid var(--rule);border-radius:10px;
  text-decoration:none;color:var(--ink)}
.fin-card:hover,.fin-card:focus-visible{border-color:var(--accent);
  background:color-mix(in srgb,var(--accent) 7%,transparent)}
.fin-card.next{background:color-mix(in srgb,var(--accent) 5%,transparent)}
.fin-k{font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--accent)}
.fin-t{font-family:Georgia,"Iowan Old Style",Palatino,serif;font-size:1.1rem;line-height:1.3}
.fin-extra{display:flex;flex-wrap:wrap;gap:.4rem 1.4rem;justify-content:space-between;
  margin-top:.3rem;font-size:.85rem}
.fin-extra a{color:var(--muted);text-decoration:none}
.fin-extra a:hover{color:var(--accent)}
@media (min-width:560px){
  .fin-nav{grid-template-columns:1fr 1fr}
  .fin-card.prev{grid-column:1}
  .fin-card.next{grid-column:2;text-align:right}
  .fin-card.next .fin-k{align-self:flex-end}
  .fin-extra{grid-column:1 / -1}
}

/* portada */
.cover{text-align:center}
.cover .kicker{font-family:var(--sans);font-size:.8rem;letter-spacing:.2em;
  text-transform:uppercase;color:var(--accent);margin:0 0 1rem}
.cover h1{margin:.3rem 0 .3rem}
.cover .subtitle{font-size:1.2rem;color:var(--muted);font-style:italic;margin:0 0 1.6rem}
.cover figure{margin:2rem auto;max-width:180px}
.cover figure img{border-radius:3px;box-shadow:0 2px 18px rgba(0,0,0,.22)}
.cover .byline{font-size:.95rem;color:var(--muted);margin:.2rem 0}
.presentacion{text-align:left;border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);
  padding:1.6rem 0;margin:2.4rem 0;font-size:1.05rem}
.acciones{display:flex;flex-wrap:wrap;gap:.7rem;justify-content:center;margin:1.4rem 0 .5rem}
.cta{display:inline-block;padding:.72rem 1.5rem;background:var(--accent);
  color:var(--accent-ink);text-decoration:none;border-radius:4px;font-weight:600;
  font-family:var(--sans);font-size:.95rem}
.cta:hover{color:var(--accent-ink);filter:brightness(1.08)}
.cta-continuar{background:transparent;color:var(--accent);border:1px solid var(--accent)}
.cta-continuar:hover{color:var(--accent);background:color-mix(in srgb,var(--accent) 10%,transparent)}
.cta-continuar b{font-weight:600}

#indice{scroll-margin-top:calc(var(--chrome-h) + 1rem);margin-top:2.5rem}
#indice>h2{font-family:var(--sans);font-size:.8rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--muted);margin:0 0 .3rem;text-align:left}
.toc{list-style:none;margin:.6rem 0 0;padding:0;text-align:left}
.toc li{border-bottom:1px solid var(--rule)}
.toc a{display:flex;gap:1rem;align-items:baseline;padding:.9rem .3rem;
  min-height:2.75rem;text-decoration:none}
.toc a:hover{background:color-mix(in srgb,var(--accent) 8%,transparent);color:var(--accent)}
.toc .n{font-family:var(--sans);font-size:.8rem;color:var(--accent);min-width:1.6rem}
.toc .t{flex:1}
.toc .w{font-size:.8rem;color:var(--muted)}

.sitefoot{max-width:var(--measure);margin:0 auto;
  padding:2rem clamp(1.1rem,5vw,1.6rem) 3rem;
  border-top:1px solid var(--rule);color:var(--muted);font-size:.82rem;line-height:1.6;
  font-family:var(--sans)}
.sitefoot a{color:var(--muted)}
.sitefoot a:hover{color:var(--accent)}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.001ms!important;animation-duration:.001ms!important}
  .barra.oculta{transform:none}
  .rail-t{transition:none}
}

@media print{
  .skip,.chrome,.leer-progreso,.rail,.barra,.fin-nav,.sitefoot,.sr-only{display:none!important}
  :root{--bg:#fff;--paper:#fff;--ink:#000;--muted:#333;--rule:#999;--accent:#000}
  body{padding:0;font-size:11pt;line-height:1.5}
  main{max-width:none;margin:0;padding:0}
  .lamina img{box-shadow:none;border:1px solid #999}
  h1,h2,h3{break-after:avoid}
  p{orphans:2;widows:2}
  a{color:#000;text-decoration:none}
}