/* ============================================================
   N2 · Navbar  ·  logo (izq) — enlaces (centro) — CTA (der)
   Depende de los tokens de brand.css. Sin referencias ambiguas.
   ============================================================ */

/* Foco visible y accesible */
.nav a:focus-visible,
.nav button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 1000;
  transition:
    background 0.35s ease,
    border-color 0.35s ease,
    backdrop-filter 0.35s ease,
    opacity 0.6s ease;
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: rgba(0, 0, 0, 0.62);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom-color: var(--line);
}

/* Grid de 3 zonas: las columnas laterales (1fr) son iguales → el centro queda centrado de verdad */
.nav-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  height: 72px;
}

/* Zona 1 · Logo */
.nav-logo {
  grid-column: 1;
  justify-self: start;
  display: inline-flex;
  align-items: center;
}
.nav-mark {
  width: 60px;
  height: 60px;
  display: inline-grid;
  place-items: center;
}
.nav-mark .brand-mark {
  width: 100%;
  height: 100%;
}
.brand-logo-text {
  font-weight: 600;
  font-size: 25px;
  letter-spacing: -0.02em;
}

/* El envoltorio deja pasar sus hijos al grid en escritorio */
.nav-collapse {
  display: contents;
}

/* Zona 2 · Enlaces (centro) */
.nav-menu {
  grid-column: 2;
  justify-self: center;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Zona 3 · CTA (derecha) */
.nav-actions {
  grid-column: 3;
  justify-self: end;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--fg-dim);
  background: none;
  border: none;
  white-space: nowrap;
}

/* Hover de los enlaces de sección: NO se aclara el texto.
   Subrayado que crece de izquierda a derecha. Solo en <a> (no en "Recursos"). */
.nav-menu a.nav-link::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 6px;
  height: 1.5px;
  background: var(--fg-dim);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.3s cubic-bezier(0.2, 0.7, 0.2, 1);
}
.nav-menu a.nav-link:hover::after,
.nav-menu a.nav-link:focus-visible::after {
  transform: scaleX(1);
}

.nav-caret {
  font-size: 9px;
  transform: translateY(1px);
  transition: transform 0.25s ease;
}

.nav-item {
  position: relative;
}

/* ============================================================
   Dropdown (Recursos)
   Posición y animación viven aquí (en el panel).
   El layout interno vive en .dropdown-link.
   ============================================================ */
.nav-dropdown {
  position: absolute;
  top: calc(100% + 6px);
  left: 50%;
  min-width: 200px;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 24px 60px -20px rgba(0, 0, 0, 0.7);
  /* Estado base: oculto y ligeramente elevado */
  opacity: 0;
  visibility: hidden;
  transform: translate(-50%, -6px);
  transition:
    opacity 0.18s ease,
    transform 0.18s ease,
    visibility 0.18s;
  z-index: 10;
}
.nav-dropdown::before {
  content: "";
  position: absolute;
  top: -6px; /* asoma medio cuadrado por encima del borde */
  left: 50%;
  width: 12px;
  height: 12px;
  transform: translateX(-50%) rotate(45deg);
  background: var(--bg-elev); /* MISMO fondo que el panel */
  border-left: 1px solid var(--line);
  border-top: 1px solid var(--line); /* solo arriba-izquierda */
}

.dropdown-link {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 10px;
  padding: 10px 12px;
  font-size: 14px;
  color: var(--fg-dim);
  border-radius: var(--radius-sm);
  transition:
    background 0.18s ease,
    color 0.18s ease;
}
.dropdown-link:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--fg);
}

/* Apertura por hover SOLO en dispositivos con puntero fino (desktop) */
@media (hover: hover) and (pointer: fine) {
  .has-dropdown:hover .nav-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, 0);
  }
  .has-dropdown:hover .nav-caret {
    transform: rotate(180deg);
  }
}
/* Apertura por click (controlada por JS, vale en touch y desktop) */
.nav-item.open > .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}
.nav-item.open > .nav-trigger .nav-caret {
  transform: rotate(180deg);
}

/* ---- Hamburguesa (oculta en desktop) ---- */
.nav-burger {
  display: none;
  width: 40px;
  height: 40px;
  background: none;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  position: relative;
}
.nav-burger span {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 18px;
  height: 1.5px;
  background: var(--fg);
  transform: translate(-50%, -50%);
  transition:
    transform 0.3s ease,
    opacity 0.2s ease;
}
.nav-burger span:nth-child(1) {
  transform: translate(-50%, -6px);
}
.nav-burger span:nth-child(3) {
  transform: translate(-50%, 6px);
}
.nav-burger[aria-expanded="true"] span:nth-child(1) {
  transform: translate(-50%, 0) rotate(45deg);
}
.nav-burger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-burger[aria-expanded="true"] span:nth-child(3) {
  transform: translate(-50%, 0) rotate(-45deg);
}

/* ============================================================
   Navbar · responsive (panel móvil)
   ============================================================ */
@media (max-width: 900px) {
  .nav-inner {
    display: flex;
    justify-content: space-between;
  }
  .nav-burger {
    display: block;
  }

  .nav-collapse {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    position: fixed;
    inset: 72px 0 auto 0;
    padding: 16px var(--gutter) 28px;
    background: rgba(0, 0, 0, 0.92);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition:
      opacity 0.3s ease,
      transform 0.3s ease,
      visibility 0.3s;
  }
  .nav.menu-open .nav-collapse {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .nav-menu {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .nav-link {
    padding: 14px 4px;
    font-size: 16px;
    border-bottom: 1px solid var(--line);
  }
  .nav-menu a.nav-link::after {
    display: none;
  } /* el subrayado no aplica en táctil */

  /* En móvil el desplegable fluye en línea, no flota */
  .nav-dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    background: transparent;
    border: none;
    padding: 0 0 8px 14px;
    min-width: 0;
  }
  .nav-dropdown::before {
    display: none;
  }

  .nav-actions {
    margin-top: 16px;
  }
  .nav-actions .btn {
    width: 100%;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .nav-menu a.nav-link::after {
    transition: none;
  }
}