/* ============================================================
   nav.css — Barra de navegación
   ============================================================ */

nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-4) 0;
  transition: background-color var(--transition-base),
    padding var(--transition-base),
    box-shadow var(--transition-base);
}

/* Estado al hacer scroll */
nav.nav--scrolled {
  background-color: var(--bg-nav);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  padding: var(--space-3) 0;
  box-shadow: var(--shadow-md);
  border-bottom: 1px solid var(--border);
}

/* ─── Inner wrapper ──────────────────────────────────────────── */
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}

/* ─── Logo ────────────────────────────────────────────────────── */
.nav-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  transition: transform var(--transition-fast), filter var(--transition-fast);
}

.nav-logo:hover {
  transform: scale(1.05);
}

.nav-logo-img {
  height: 52px;
  width: auto;
  display: block;
  object-fit: contain;
}

/* Lógica de intercambio de logos */
/* 1. Por defecto, siempre mostramos el logo BLANCO porque el fondo Hero es oscuro (incluso en modo claro) */
.nav-logo-dark { display: none; }
.nav-logo-light { display: block; }

/* 2. Cuando estamos en modo CLARO y se hace SCROLL (el fondo se vuelve claro) -> Mostrar logo NEGRO */
[data-theme="light"] nav.nav--scrolled .nav-logo-light { display: none; }
[data-theme="light"] nav.nav--scrolled .nav-logo-dark { display: block; }

/* ─── Menú ────────────────────────────────────────────────────── */
.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-menu a {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.85);
  padding: var(--space-1) 0;
  position: relative;
  transition: color var(--transition-fast);
}

[data-theme="light"] nav.nav--scrolled .nav-menu a {
  color: var(--text-secondary);
}

/* Subrayado animado */
.nav-menu a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition-base);
}

.nav-menu a:hover {
  color: #fff;
}

[data-theme="light"] nav.nav--scrolled .nav-menu a:hover {
  color: var(--accent);
}

.nav-menu a:hover::after {
  width: 100%;
}

/* ─── Botón CTA en nav ────────────────────────────────────────── */
.nav-cta {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-on-accent) !important;
  background: var(--accent);
  padding: var(--space-2) var(--space-5) !important;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast) !important;
}

.nav-cta:hover {
  background: var(--accent-glow) !important;
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow) !important;
}

.nav-cta::after {
  display: none !important;
}

/* ─── Botón Toggle de tema ────────────────────────────────────── */
.theme-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #fff;
  transition: background var(--transition-fast),
    transform var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast);
  flex-shrink: 0;
  position: relative;
  z-index: 1000;
}

[data-theme="light"] nav.nav--scrolled .theme-toggle-btn {
  color: var(--text-primary);
  border-color: rgba(26, 16, 6, 0.2);
}

.theme-toggle-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: rotate(20deg);
}

[data-theme="light"] nav.nav--scrolled .theme-toggle-btn:hover {
  background: rgba(26, 16, 6, 0.1);
}

.theme-toggle-btn svg {
  pointer-events: none;
}

/* ─── Hamburger (móvil) ────────────────────────────────────────── */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.1);
  transition: background var(--transition-fast);
  position: relative;
  z-index: 1000;
}

.hamburger:hover {
  background: rgba(255, 255, 255, 0.2);
}

[data-theme="light"] nav.nav--scrolled .hamburger:hover {
  background: rgba(26, 16, 6, 0.1);
}

.hamburger span {
  display: block;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all var(--transition-base);
  transform-origin: center;
}

[data-theme="light"] nav.nav--scrolled .hamburger span {
  background: var(--text-primary);
}

[data-theme="light"] .hamburger.hamburger--open span {
  background: var(--text-primary) !important;
}

/* Estado abierto */
.hamburger--open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger--open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.hamburger--open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ─── Responsive ──────────────────────────────────────────────── */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 100dvh;
    /* Evita que el contenedor nav limite la altura */
    width: 100%;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-6);
    padding: var(--space-16) var(--space-8);
    background: var(--bg-nav);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: var(--shadow-lg);
    transform: translateY(-100%);
    transition: transform var(--transition-slow);
    overflow-y: auto;
    z-index: 900;
  }

  .nav-menu.nav-menu--open {
    transform: translateY(0);
  }

  .nav-menu a {
    font-size: var(--text-xl);
    color: var(--text-primary);
  }

  [data-theme="light"] nav.nav--scrolled .nav-menu a {
    color: var(--text-primary);
  }

  .nav-menu a:hover {
    color: var(--accent);
  }

  [data-theme="light"] nav.nav--scrolled .nav-menu a:hover {
    color: var(--accent);
  }

  .nav-cta {
    color: var(--text-on-accent) !important;
    background: var(--accent) !important;
    padding: var(--space-3) var(--space-6) !important;
  }
}