/* Nav, loader, scroll cue — piezas de interfaz compartidas por todos los capítulos. */

/* — Loader — */
.loader {
  position: fixed;
  inset: 0;
  z-index: var(--z-loader);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  background: var(--color-notte);
  transition: opacity 700ms var(--ease-editorial), visibility 700ms var(--ease-editorial);
}

.loader[data-hidden="true"] {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader__mark {
  width: min(46vw, 220px);
  color: var(--color-pergamena);
}

.loader__mark path {
  stroke-dasharray: 1000;
  stroke-dashoffset: 1000;
  animation: draw-line var(--duration-loader-draw) var(--ease-editorial) forwards;
}

.loader__mark path#isotipo-ear {
  animation-delay: calc(var(--duration-loader-draw) * 0.55);
}

.loader__mark path#isotipo-leg-front {
  animation-delay: calc(var(--duration-loader-draw) * 0.72);
}

.loader__mark path#isotipo-leg-back {
  animation-delay: calc(var(--duration-loader-draw) * 0.8);
}

@keyframes draw-line {
  to {
    stroke-dashoffset: 0;
  }
}

.loader__descriptor {
  font-family: var(--font-serif);
  font-size: var(--type-meta);
  letter-spacing: var(--tracking-descriptor);
  text-transform: uppercase;
  color: var(--color-champagne);
  opacity: 0;
  animation: fade-up 700ms var(--ease-editorial) forwards;
  animation-delay: calc(var(--duration-loader-draw) * 0.55);
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .loader__mark path {
    stroke-dashoffset: 0;
    animation: none;
  }
  .loader__descriptor {
    opacity: 1;
    animation: none;
  }
}

/* — Nav — */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-4);
  color: var(--ink);
  mix-blend-mode: difference;
  pointer-events: none;
}

.site-nav * {
  pointer-events: auto;
}

.site-nav__mark {
  width: 28px;
  height: 14px;
  color: var(--color-pergamena);
  text-decoration: none;
  display: block;
}

.site-nav__chapter {
  font-family: var(--font-serif);
  font-size: var(--type-meta);
  letter-spacing: var(--tracking-descriptor);
  text-transform: uppercase;
  color: var(--color-pergamena);
}

.site-nav__progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  background: var(--color-champagne);
  z-index: var(--z-nav);
  width: 0%;
  transition: width 100ms linear;
}

/* mix-blend-mode: difference sobre fondo Pergamena (#F0EBE2) sobre pergamena-ink invertido
   da un gris cálido legible en ambos modos sin necesitar lógica JS adicional de color. */

/* — Scroll cue — */
.scroll-cue {
  position: absolute;
  bottom: var(--space-4);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-serif);
  font-size: var(--type-meta);
  letter-spacing: var(--tracking-descriptor);
  text-transform: uppercase;
  color: var(--ink-secondary);
}

.scroll-cue__line {
  width: 1px;
  height: 36px;
  background: currentColor;
  overflow: hidden;
}

.scroll-cue__line::after {
  content: "";
  display: block;
  width: 100%;
  height: 100%;
  background: var(--accent);
  transform: translateY(-100%);
  animation: cue-drop 2200ms var(--ease-editorial) infinite;
}

@keyframes cue-drop {
  0% {
    transform: translateY(-100%);
  }
  60% {
    transform: translateY(100%);
  }
  100% {
    transform: translateY(100%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .scroll-cue__line::after {
    animation: none;
    transform: translateY(0);
  }
}