/* La biblioteca del viaje · misma marca que el reloj: noche, crema, un acento lima por pantalla. */
@font-face { font-family: 'Beaufort Pro'; src: url('../fonts/Beaufort-Pro-Medium.otf') format('opentype'); font-weight: 500; font-display: swap; }
@font-face { font-family: 'Beaufort Pro'; src: url('../fonts/Beaufort-Pro-Light.otf') format('opentype'); font-weight: 300; font-display: swap; }
@font-face { font-family: 'Inter'; src: url('../fonts/Inter-Variable.ttf') format('truetype'); font-weight: 100 900; font-display: swap; }
:root {
  --noche: #0F190F; --superficie: #142114; --linea: rgba(247, 248, 229, .14); --crema: #F7F8E5; --gris: #A9B09C;
  --lima: #D0FD00; --esmeralda: #18D591;
  --display: 'Beaufort Pro', 'Iowan Old Style', Georgia, serif; --texto: 'Inter', -apple-system, 'Segoe UI', sans-serif;
  color-scheme: dark;
}
* { box-sizing: border-box }
[hidden] { display: none !important }
html { scroll-behavior: smooth; scroll-padding-top: 124px }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto } }
body { margin: 0; background: radial-gradient(120% 60% at 50% 0%, #17301F 0%, var(--noche) 55%) no-repeat, var(--noche); color: var(--crema);
  font: 400 15px/1.55 var(--texto); -webkit-font-smoothing: antialiased; overflow-x: hidden;
  padding-bottom: env(safe-area-inset-bottom, 0px) }
a { color: inherit }
:focus-visible { outline: 2px solid var(--lima); outline-offset: 3px }
.envoltura { max-width: 760px; margin: 0 auto; padding-left: max(18px, env(safe-area-inset-left, 0px)); padding-right: max(18px, env(safe-area-inset-right, 0px)) }

.cab { position: sticky; top: 0; z-index: 6; display: flex; justify-content: space-between; align-items: center; gap: 12px;
  padding: calc(12px + env(safe-area-inset-top, 0px)) max(18px, env(safe-area-inset-right, 0px)) 12px max(18px, env(safe-area-inset-left, 0px));
  background: rgba(15, 25, 15, .86); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-bottom: 1px solid var(--linea) }
.cab img { display: block; height: 15px; width: auto }
.cab-cta { font-size: 13px; font-weight: 600; text-decoration: none; padding: 8px 14px; border-radius: 100px; border: 1px solid rgba(208, 253, 0, .5); color: var(--lima) }
.cab-cta:hover { opacity: .85 }

.portada { padding-block: 40px 30px; display: flex; flex-direction: column; gap: 14px }
.isotipo { width: 44px; height: auto }
h1 { font: 500 clamp(36px, 9vw, 60px)/1.02 var(--display); letter-spacing: -.015em; margin: 0; text-wrap: balance }
h2 { font: 500 clamp(26px, 6.4vw, 36px)/1.1 var(--display); margin: 0; text-wrap: balance }
.entradilla { font-size: 17px; line-height: 1.55; margin: 0; max-width: 60ch; color: var(--crema) }
.prueba { margin: 0; font-size: 13.5px; color: var(--gris); max-width: 60ch }
.cta { display: flex; align-items: center; justify-content: center; min-height: 52px; padding: 0 22px; border-radius: 14px; background: var(--lima); color: var(--noche);
  font: 600 16px/1 var(--texto); text-decoration: none; max-width: 420px; box-shadow: 0 10px 28px -12px rgba(208, 253, 0, .5) }
.cta:hover { opacity: .92 }
.nota-cta { margin: -4px 0 0; font-size: 13px; color: var(--gris); max-width: 52ch }

.indice { position: sticky; top: calc(var(--cab, 62px) + env(safe-area-inset-top, 0px)); z-index: 5; background: rgba(15, 25, 15, .92); border-bottom: 1px solid var(--linea) }
.indice-carril { display: flex; gap: 6px; overflow-x: auto; padding-block: 10px; scrollbar-width: none }
.indice-carril::-webkit-scrollbar { display: none }
.indice-carril a { flex: none; white-space: nowrap; text-decoration: none; font-size: 13px; color: var(--gris); padding: 6px 12px; border-radius: 100px; border: 1px solid var(--linea) }
.indice-carril a b { color: var(--esmeralda); font-weight: 600; font-variant-numeric: tabular-nums; margin-right: 2px }
.indice-carril a:hover { color: var(--crema); border-color: rgba(247, 248, 229, .32) }

.filtro { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; padding-block: 18px 4px; font-size: 14px; color: var(--gris) }
.interruptor { display: inline-flex; align-items: center; gap: 8px; cursor: pointer; color: var(--crema) }
.interruptor input { accent-color: var(--lima); width: 18px; height: 18px; margin: 0 }
.cuenta { font-variant-numeric: tabular-nums }

.etapa { padding-block: 26px 6px; border-bottom: 1px solid var(--linea) }
.etapa > header { display: flex; gap: 16px; align-items: flex-start; margin-bottom: 6px }
.num { flex: none; min-width: 1.4em; font: 300 44px/0.9 var(--display); color: var(--esmeralda); font-variant-numeric: tabular-nums }
h3 { font: 500 clamp(22px, 5.6vw, 28px)/1.12 var(--display); margin: 2px 0 0; text-wrap: balance }
.pregunta { margin: 4px 0 0; color: var(--gris); font-size: 14.5px }
.epoca { font: 600 13px/1.3 var(--texto); color: var(--esmeralda); margin: 22px 0 0; letter-spacing: .02em }
.lista { list-style: none; margin: 0; padding: 0; display: grid }
.libro { padding: 16px 0; border-top: 1px solid var(--linea); min-width: 0 }
.lista .libro:first-child { border-top: 0 }
.libro h4 { font: 500 19px/1.25 var(--display); margin: 0 }
.autor { margin: 3px 0 0; font-size: 13px; color: var(--gris); font-variant-numeric: tabular-nums }
.gancho { margin: 8px 0 0; font-size: 15px; line-height: 1.55; max-width: 62ch }
.botones { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 11px }
.bajar { font-size: 13px; font-weight: 600; text-decoration: none; padding: 8px 13px; border-radius: 100px; background: rgba(208, 253, 0, .12); color: var(--lima); border: 1px solid rgba(208, 253, 0, .35) }
.bajar.sec { background: none; color: var(--crema); border-color: var(--linea) }
.bajar:hover { opacity: .85 }

.intermedio { margin: 22px 0; padding: 20px; border-radius: 18px; background: var(--superficie); border: 1px solid var(--linea); display: flex; flex-direction: column; gap: 12px }
.intermedio p { margin: 0; font: 500 19px/1.3 var(--display) }
.cierre { padding-block: 44px 30px; display: flex; flex-direction: column; gap: 12px }
.cierre p { margin: 0; color: var(--gris); max-width: 52ch }
.pie { padding-block: 26px 40px; color: var(--gris); font-size: 12.5px; border-top: 1px solid var(--linea) }
.pie img { height: 14px; width: auto; opacity: .7 }
.pie p { margin: 10px 0 0; max-width: 64ch }

@media (min-width: 720px) {
  .portada { padding-block: 72px 40px }
  .lista { grid-template-columns: 1fr 1fr; column-gap: 32px }
  .lista .libro:nth-child(2) { border-top: 0 }
}

/* 23-oct · el mismo espacio y el mismo cristal que el reloj */
:root { --noche: #050A07;
  --vidrio: linear-gradient(135deg, rgba(247,248,229,.10), rgba(247,248,229,.025) 55%, rgba(24,213,145,.05));
  --vidrio-borde: rgba(247,248,229,.16);
  --vidrio-sombra: inset 0 1px 0 rgba(255,255,255,.12), 0 18px 40px -18px rgba(0,0,0,.75); }
body { background:
  radial-gradient(55% 35% at 50% 8%, rgba(24,213,145,.16), transparent 70%),
  radial-gradient(45% 38% at 10% 70%, rgba(6,63,50,.5), transparent 72%),
  radial-gradient(38% 30% at 90% 30%, rgba(208,253,0,.06), transparent 70%),
  radial-gradient(130% 95% at 50% 30%, #0A160F 0%, #050A07 62%, #020403 100%) fixed, var(--noche) }
body::before { content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none; opacity: .5;
  background-image:
    radial-gradient(1px 1px at 23px 41px, rgba(247,248,229,.9), transparent 60%),
    radial-gradient(1px 1px at 151px 97px, rgba(247,248,229,.7), transparent 60%),
    radial-gradient(1.5px 1.5px at 89px 173px, rgba(208,253,0,.7), transparent 60%),
    radial-gradient(1px 1px at 211px 29px, rgba(24,213,145,.9), transparent 60%),
    radial-gradient(1px 1px at 320px 150px, rgba(247,248,229,.8), transparent 60%);
  background-size: 260px 260px, 260px 260px, 260px 260px, 260px 260px, 410px 410px }
.indice-carril a, .bajar, .intermedio, .libro, .cab-cta {
  background: var(--vidrio); border: 1px solid var(--vidrio-borde); box-shadow: var(--vidrio-sombra);
  -webkit-backdrop-filter: blur(16px) saturate(150%); backdrop-filter: blur(16px) saturate(150%) }
.bajar { color: var(--crema) } .bajar:not(.sec) { border-color: rgba(208,253,0,.45); color: var(--lima) }
.libro { border-radius: 18px; padding: 16px 18px; border-top: 1px solid var(--vidrio-borde) }
.lista { gap: 12px; margin-top: 14px }
.lista .libro:first-child, .lista .libro:nth-child(2) { border-top: 1px solid var(--vidrio-borde) }
.etapa { border-bottom: 0 }
.cta { background: linear-gradient(180deg, #E3FF4D 0%, var(--lima) 60%, #BDE600 100%); border-radius: 16px;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.55), 0 0 0 1px rgba(208,253,0,.35), 0 14px 38px -14px rgba(208,253,0,.65) }
.portada, .cierre { text-align: center; align-items: center }
.portada .cta, .cierre .cta { width: 100%; max-width: 420px }
.portada .entradilla, .portada .prueba, .nota-cta, .cierre p { margin-inline: auto }
.intermedio { text-align: center; align-items: center; border-radius: 22px }
.intermedio .cta { width: 100%; max-width: 360px }