/* ============================================================
   NIVORA v2 — Chrome: barra, capítulos, botones, dock, footer
   ============================================================ */

/* ── Barra superior ─────────────────────────────────────── */
.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: var(--z-chrome);
  color: var(--on-dark);
  transition: color var(--dur-ui) ease;
}
.topbar::before {                       /* fondo al hacer scroll: funcional, no vidrio */
  content: "";
  position: absolute;
  inset: 0;
  background: var(--ink);
  border-bottom: 1px solid var(--rule-dark);
  opacity: 0;
  transition: opacity var(--dur-ui) ease, background-color var(--dur-ui) ease, border-color var(--dur-ui) ease;
}
.topbar.is-stuck::before { opacity: 1; }
html[data-theme="light"] .topbar { color: var(--on-light); }
html[data-theme="light"] .topbar::before {
  background: var(--ivory);
  border-bottom-color: var(--rule-light);
}

.topbar__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--s-3);
  height: 64px;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.topbar__brand {
  display: inline-flex;
  padding: 6px;
  margin-left: -6px;
}
.topbar__mono { width: 28px; height: auto; }

.topbar__cta {
  margin-left: auto;
  white-space: nowrap;
  font-size: var(--fs-small);
  font-weight: 500;
  text-decoration: none;
  padding: 10px 2px;
  background-image: linear-gradient(currentColor, currentColor);
  background-size: 0% 1px;
  background-position: 0 calc(100% - 6px);
  background-repeat: no-repeat;
  transition: background-size var(--dur-ui) var(--ease-out);
}
@media (hover: hover) and (pointer: fine) {
  .topbar__cta:hover { background-size: 100% 1px; }
}
/* En móvil el dock ya es el CTA: no se duplica la intención */
@media (max-width: 899px) { body:not(.legal-page) .topbar__cta { display: none; } }

/* ── Capítulos: placas que voltean ──────────────────────── */
.chapters { display: none; }
@media (min-width: 900px) {
  .chapters { display: flex; align-items: center; margin-left: var(--s-6); }
}
.chapters__list { display: flex; align-items: center; gap: 6px; }

.chapter {
  position: relative;
  display: grid;
  place-items: center;
  width: 22px;
  height: 32px;
  perspective: 120px;
}
.chapter__flap {
  position: relative;
  width: 10px;
  height: 11px;                          /* proporción del monograma ≈ 0.919 */
  transform-style: preserve-3d;
  transition: transform 360ms var(--ease-in-out);
  transition-delay: calc(var(--i, 0) * 40ms);   /* cascada: se lee como progreso */
}
.chapter__flap::before,
.chapter__flap::after {
  content: "";
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
}
.chapter__flap::before { background: color-mix(in srgb, currentColor 22%, transparent); }
.chapter__flap::after  { background: var(--blue); transform: rotateX(180deg); }
.chapter.is-past .chapter__flap,
.chapter.is-current .chapter__flap { transform: rotateX(180deg); }
.chapter.is-current .chapter__flap::after { background: currentColor; }

.chapter__label {                        /* accesible siempre, visible al pasar */
  position: absolute;
  top: calc(100% + 6px);
  left: 50%;
  white-space: nowrap;
  font-size: var(--fs-micro);
  font-weight: 500;
  padding: 4px 8px;
  background: var(--ink-3);
  color: var(--on-dark);
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -4px);
  transition: opacity 160ms ease-out, transform 160ms var(--ease-out);
}
html[data-theme="light"] .chapter__label { background: var(--black-brand); color: var(--ivory); }
.chapter:focus-visible .chapter__label { opacity: 1; transform: translate(-50%, 0); transition: none; }
.chapters.is-quiet .chapter__label { opacity: 0 !important; }   /* Esc las oculta (WCAG 1.4.13) */
@media (hover: hover) and (pointer: fine) {
  .chapter:hover .chapter__label { opacity: 1; transform: translate(-50%, 0); }
  /* Con una etiqueta ya abierta, la siguiente aparece al instante */
  .chapters__list:hover .chapter .chapter__label { transition-duration: 0ms; }
}

.chapters__now {
  position: relative;
  display: inline-grid;
  height: 1.4em;
  overflow: clip;
  margin-left: var(--s-2);
  font-size: var(--fs-micro);
  font-weight: 500;
  color: var(--on-dark-muted);
  min-width: 12ch;
  transition: opacity var(--dur-micro) ease;
}
.chapters__now.is-hidden { opacity: 0; }
/* El texto voltea como una placa: sale hacia arriba, entra desde abajo */
.chapters__now-t {
  grid-area: 1 / 1;
  white-space: nowrap;
  transition: transform 220ms var(--ease-out), opacity 220ms ease-out;
}
.chapters__now-t.is-in { transform: translateY(100%); opacity: 0; }
.chapters__now-t.is-out { transform: translateY(-100%); opacity: 0; transition-duration: 140ms; }
html[data-theme="light"] .chapters__now { color: var(--on-light-muted); }

/* ── Botones ────────────────────────────────────────────── */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 52px;
  padding: 0 26px;
  border: 0;
  border-radius: var(--radius);
  font-family: var(--font-text);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.005em;
  text-decoration: none;
  white-space: nowrap;
  isolation: isolate;
  user-select: none;
  -webkit-user-select: none;
  transition: transform var(--dur-press) var(--ease-out), background-color var(--dur-micro) ease, color var(--dur-micro) ease;
}
.btn:active { transform: scale(0.97); }
.btn--lg { min-height: 60px; padding: 0 32px; font-size: 1.0625rem; }
.btn--block { width: 100%; }

.btn--primary { background: var(--blue); color: var(--ivory); }
/* Barrido a 20.35°: la misma diagonal del monograma */
.btn--primary::after {
  --slant: 19px;                          /* tan(20.35°) × 52 px de alto */
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--blue-deep);
  clip-path: polygon(0 0, 0 0, calc(0% - var(--slant)) 100%, calc(0% - var(--slant)) 100%);
  transition: clip-path 160ms var(--ease-out);
}
.btn--lg::after { --slant: 22px; }       /* × 60 px */
@media (hover: hover) and (pointer: fine) {
  .btn--primary:hover::after {
    clip-path: polygon(0 0, calc(100% + var(--slant)) 0, 100% 100%, calc(0% - var(--slant)) 100%);
    transition-duration: 280ms;
  }
}
.btn--primary:active { background: var(--blue-deep); }

.btn--ghost {
  background: transparent;
  color: inherit;
  box-shadow: inset 0 0 0 1px currentColor;
}
@media (hover: hover) and (pointer: fine) {
  .btn--ghost:hover { background: color-mix(in srgb, currentColor 8%, transparent); }
}

@media (hover: hover) and (pointer: fine) { [data-magnetic] { will-change: translate; } }

/* ── Dock móvil ─────────────────────────────────────────── */
.dock {
  position: fixed;
  inset: auto 0 0 0;
  z-index: var(--z-dock);
  padding: 12px var(--gutter) calc(12px + env(safe-area-inset-bottom));
  background: linear-gradient(to top, color-mix(in srgb, var(--ink) 92%, transparent) 60%, transparent);
  transform: translateY(110%);
  visibility: hidden;                                  /* fuera de pantalla = fuera del orden de foco */
  transition: transform 180ms var(--ease-out), visibility 0s linear 180ms;   /* cerrar: rápido */
}
.dock.is-open { transform: none; visibility: visible; transition: transform 300ms var(--ease-drawer), visibility 0s; }
.dock .btn { min-height: 54px; }
@media (min-width: 900px) { .dock { display: none; } }

/* ── Footer ─────────────────────────────────────────────── */
.footer {
  background: var(--ivory);
  color: var(--on-light);
  padding-block: var(--s-12) calc(var(--s-8) + env(safe-area-inset-bottom));
}
html.has-field .footer { background: transparent; }
.footer__wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--s-4);
  border-top: 1px solid var(--rule-light);
  padding-top: var(--s-6);
}
.footer__logo { width: 152px; height: auto; }
.footer__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  font-size: var(--fs-micro);
  color: var(--on-light-muted);
}
.footer__meta a { color: var(--on-light); }
.footer__sep { display: none; }          /* form.js inserta «·»; el gap ya separa */
#footer-extra { display: contents; }
@media (hover: hover) and (pointer: fine) {
  .footer__meta a:hover { color: var(--blue); }
}

/* ── Movimiento reducido: menos y más suave, nunca cero ── */
html:not(.motion-ok) .dock { transform: none; opacity: 0; visibility: hidden; transition: opacity 200ms ease, visibility 0s 200ms; }
html:not(.motion-ok) .dock.is-open { opacity: 1; visibility: visible; transition: opacity 200ms ease; }
html:not(.motion-ok) .chapter__flap { transition: none; }
html:not(.motion-ok) .chapter__flap::after { transform: none; opacity: 0; transition: opacity 120ms ease; }
html:not(.motion-ok) .chapter.is-past .chapter__flap,
html:not(.motion-ok) .chapter.is-current .chapter__flap { transform: none; }
html:not(.motion-ok) .chapter.is-past .chapter__flap::after,
html:not(.motion-ok) .chapter.is-current .chapter__flap::after { opacity: 1; }
html:not(.motion-ok) .chapters__now-t { transition: none; }