/* ==========================================================================
   NAV — Navegación Desktop y Mobile
   ========================================================================== */


/* --------------------------------------------------------------------------
   1. Barra de navegación principal (desktop)
   -------------------------------------------------------------------------- */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.4rem 4rem;
  /* Sin fondo al inicio — transparente sobre el Hero */
  transition: background var(--transition-slow), box-shadow var(--transition-slow);
}

/* Estado al hacer scroll — fondo frosted glass */
nav.scrolled {
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-nav);
}


/* --------------------------------------------------------------------------
   2. Logo en la nav
   -------------------------------------------------------------------------- */
.nav-logo {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--white);
  text-decoration: none;
  transition: color var(--transition-slow);
}

nav.scrolled .nav-logo {
  color: var(--dark);
}

/* Logo en imagen: blanco sobre el hero (arriba), oscuro al scrollear (fondo claro) */
.nav-logo {
  display: inline-flex;
  align-items: center;
}
.nav-logo img {
  height: 56px;
  width: auto;
  display: block;
}
.nav-logo .logo-dark { display: none; }
nav.scrolled .nav-logo .logo-light { display: none; }
nav.scrolled .nav-logo .logo-dark { display: block; }

/* El logo blanco lleva una sombra sutil para legibilidad sobre fondos claros del hero. */
.nav-logo .logo-light { filter: drop-shadow(0 1px 4px rgba(0, 0, 0, 0.45)); }

@media (max-width: 600px) {
  .nav-logo img { height: 40px; }
}


/* --------------------------------------------------------------------------
   3. Links de navegación desktop
   -------------------------------------------------------------------------- */
.nav-links {
  /* Centrado respecto a la página (no afectado por el ancho del logo). */
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--white);
  transition: opacity var(--transition-fast);
}

.nav-links a:hover,
.nav-links a:focus-visible {
  opacity: 0.65;
}

nav.scrolled .nav-links a {
  color: var(--dark);
}

/* Variante pill — enlace "Contacto" destacado */
.nav-links .pill {
  border: 1.5px solid var(--white);
  border-radius: var(--radius-pill);
  padding: 0.45rem 1.4rem;
  transition: border-color var(--transition-slow);
}

nav.scrolled .nav-links .pill {
  border-color: var(--dark);
}


/* --------------------------------------------------------------------------
   4. Botón hamburger (visible en mobile)
   -------------------------------------------------------------------------- */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  /* Área de toque mínima recomendada: 44x44px (WCAG 2.5.5) */
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  transition: background var(--transition-slow);
  border-radius: 1px;
}

nav.scrolled .hamburger span {
  background: var(--dark);
}


/* --------------------------------------------------------------------------
   5. Menú mobile (overlay de pantalla completa)
   -------------------------------------------------------------------------- */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 101;
  background: rgba(255, 255, 255, 0.98);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2.5rem;
}

/* Clase .open activada por JS */
.mobile-menu.open {
  display: flex;
}

.mobile-menu a {
  font-family: var(--sans);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--dark);
  /* Área de toque generosa para mobile */
  padding: 0.5rem 1rem;
  transition: color var(--transition-fast);
}

.mobile-menu a:hover,
.mobile-menu a:focus-visible {
  color: var(--brown);
}

/* Botón de cierre del menú mobile */
.close-btn {
  position: absolute;
  top: 1.5rem;
  right: 2rem;
  font-size: 2rem;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--dark);
  line-height: 1;
  /* Área de toque mínima */
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-fast);
}

.close-btn:hover,
.close-btn:focus-visible {
  color: var(--brown);
}