/* ========================================
   HEADER
   ======================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background: rgba(13, 3, 38, 0.85);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 32px;
  transition: background-color var(--dur-base) ease, box-shadow var(--dur-base) ease;
}

.header.is-scrolled {
  background: var(--header-bg);
  box-shadow: var(--shadow-sm);
}

.header-content {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.logo-section {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 150px;
}

.logo-icon {
  height: 40px;
  width: 40px;
  object-fit: contain;
}

.logo-text {
  font-family: var(--font-primary);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 1px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
  flex: 1;
  justify-content: center;
  flex-wrap: wrap;
}

.nav-link {
  position: relative;
  color: var(--text-light);
  font-size: var(--fs-sm);
  font-weight: 500;
  opacity: 0.85;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-fast) ease;
}

/* El hover pisaba el token de texto con --primary-accent (pensado solo
   para fondos/gradientes), dando ~3.5:1 — falla AA. --accent-text da 7:1. */
.nav-link:hover {
  color: var(--accent-text);
  opacity: 1;
}

.nav-link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-link.active {
  color: var(--cyan);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 2px;
  background: var(--cyan);
  border-radius: var(--r-pill);
  transform: none;
}

/* Selector de idioma: control segmentado compacto, misma familia visual
   que los eyebrows (JetBrains Mono) y bordes hairline del rediseño. */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  background: var(--surface-1);
  border: 1px solid var(--border-hairline-strong);
  border-radius: var(--r-pill);
}

.lang-btn {
  justify-content: center;
  min-width: 40px;
  padding: 0 var(--sp-3);
  background: transparent;
  color: var(--text-subtle);
  border: none;
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 500;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background-color var(--dur-fast) ease, color var(--dur-fast) ease, box-shadow var(--dur-fast) ease;
}

.lang-btn:hover {
  color: var(--text-light);
}

.lang-btn.active {
  background: var(--surface-tint);
  color: var(--text-light);
  box-shadow: inset 0 0 0 1px var(--accent-40);
}

.lang-btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ========================================
   NAV TOGGLE (MENÚ MÓVIL)
   ======================================== */

.nav-toggle {
  display: none;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--r-sm);
  color: var(--text-light);
  cursor: pointer;
  transition: border-color var(--dur-fast) ease, color var(--dur-fast) ease;
}

.nav-toggle:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

.nav-toggle svg {
  width: 22px;
  height: 22px;
}

.nav-toggle-close {
  display: none;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-open {
  display: none;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-close {
  display: block;
}

/* Objetivos táctiles mínimos de 44px en controles interactivos */
.nav-toggle,
.nav-link {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

/* El selector de idioma queda en 34px + 3px de padding del contenedor
   (≈40px de alto total, igual que .btn--sm): supera el mínimo WCAG 2.2
   AA de 24px sin verse sobredimensionado junto al menú. */
.lang-btn {
  min-height: 34px;
  display: inline-flex;
  align-items: center;
}

/* ========================================
   RESPONSIVE
   ======================================== */

@media (max-width: 768px) {
  .header-content {
    padding: 0;
    gap: 12px;
  }

  .header .nav-toggle {
    display: inline-flex;
  }

  .nav-menu {
    order: 3;
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--sp-4);
    /* Más opaco que --header-bg (0.85): el menú móvil tapa el hero que
       queda detrás y con el fondo original se transparentaba demasiado. */
    background: rgba(13, 3, 38, 0.97);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.35);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--dur-base) ease, transform var(--dur-base) ease, visibility var(--dur-base);
    font-size: var(--fs-sm);
  }

  .nav-menu.is-open {
    opacity: 1;
    transform: none;
    visibility: visible;
  }

  .nav-link {
    font-size: var(--fs-sm);
    padding: var(--sp-3) 0;
    border-bottom: 1px solid var(--border-color);
  }
}

@media (max-width: 480px) {
  .header {
    padding: 12px 16px;
  }

  .header-content {
    gap: 8px;
  }

  .logo-text {
    font-size: 16px;
  }

  .logo-icon {
    height: 32px;
    width: 32px;
  }

  .nav-menu {
    gap: 8px;
  }
}