/* ============================================================
   NAV — compartido entre index.html y accion.html
   Única fuente de verdad para el header. No duplicar estas
   reglas en styles.css ni en el <style> de accion.html.
   ============================================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px var(--gutter);
  color: #fff;
  pointer-events: none;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  transition: background 0.4s ease, backdrop-filter 0.4s ease,
    color 0.4s ease, padding 0.3s ease, border-color 0.4s ease;
  border-bottom: 1px solid transparent;
  mix-blend-mode: difference;
}

.nav--scrolled {
  mix-blend-mode: normal;
  background: rgba(255, 255, 255, 0.78);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
  border-bottom-color: var(--line-soft);
  color: var(--fg);
  padding-top: 12px;
  padding-bottom: 12px;
}

.nav--scrolled .nav__logo {
  filter: none;
  height: 48px;
}

body[data-theme="invert"] .nav--scrolled,
body[data-theme="azul"] .nav--scrolled,
body[data-theme="magenta"] .nav--scrolled {
  background: rgba(10, 10, 10, 0.6);
  color: #fff;
}

body[data-theme="invert"] .nav--scrolled .nav__logo,
body[data-theme="azul"] .nav--scrolled .nav__logo,
body[data-theme="magenta"] .nav--scrolled .nav__logo {
  filter: invert(1);
}

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

.nav__brand {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: inherit;
}

.nav__brand-mark {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
}

.nav__logo {
  display: block;
  height: 72px;
  width: auto;
  /* Logo viene en negro; con mix-blend-mode: difference del nav
     se invierte automáticamente sobre fondos oscuros.
     Para asegurar contraste, lo forzamos a blanco vía filter. */
  filter: invert(1);
}

.nav__menu {
  display: flex;
  gap: 48px;
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.nav__menu a {
  position: relative;
  padding: 4px 0;
  text-decoration: none;
  color: inherit;
}

.nav__menu a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 1px;
  background: currentColor;
  transition: right 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.nav__menu a:hover::after {
  right: 0;
}

@media (max-width: 880px) {
  .nav {
    padding: 14px 20px;
  }
  .nav__logo {
    height: 52px;
  }
  .nav__menu {
    gap: 0;
    font-size: 14px;
    letter-spacing: 0.07em;
  }
  .nav__menu a {
    padding: 4px 9px;
  }
  .nav__menu a:not(:first-child)::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 12px;
    background: currentColor;
  }
}

@media (max-width: 640px) {
  .nav {
    padding: 10px 14px;
  }
  .nav__logo {
    height: 38px;
  }
  .nav__menu {
    gap: 12px;
    font-size: 11px;
    letter-spacing: 0.04em;
  }
  .nav__menu a {
    padding: 4px 0;
  }
  .nav__menu a:not(:first-child)::before {
    content: "";
    position: absolute;
    left: -6px;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 12px;
    background: currentColor;
    opacity: 0.4;
  }
}

@media (max-width: 420px) {
  .nav__menu {
    gap: 8px;
    font-size: 10px;
    letter-spacing: 0.02em;
  }
  .nav__menu a:not(:first-child)::before {
    left: -4px;
  }
}

@media (pointer: coarse) {
  .nav__menu a {
    padding: 8px 0;
  }
}