/* ==========================================================================
   AURA - COCINA DE AUTOR
   Estilos de Cabecera y Menú Navegación (header.css)
   ========================================================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 1000;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.site-header.is-scrolled {
  background-color: rgba(11, 14, 20, 0.95);
  border-bottom-color: var(--border-color);
  box-shadow: var(--shadow-md);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  position: relative;
}

/* Brand / Logo */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: 0.05em;
  white-space: nowrap;
  flex-shrink: 0;
}

.brand-logo .logo-symbol {
  color: var(--color-gold-primary);
  font-size: 1.8rem;
  line-height: 1;
}

.brand-logo span {
  background: linear-gradient(135deg, var(--text-main) 60%, var(--color-gold-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Nav Menu (Horizontal Layout by Default) */
.header-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-shrink: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  white-space: nowrap;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
  padding: 0.4rem 0;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-gold-primary);
  transition: width var(--transition-fast);
  border-radius: var(--radius-full);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-main);
}

.nav-link.active {
  color: var(--color-gold-primary);
  font-weight: 600;
}

.nav-link.active::after,
.nav-link:hover::after {
  width: 100%;
}

.header-cta {
  flex-shrink: 0;
}

/* Botón Hamburguesa (Oculto por defecto si el menú horizontal cabe) */
.hamburger-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
  z-index: 1010;
}

.hamburger-btn:hover {
  border-color: var(--color-gold-primary);
  background-color: rgba(212, 175, 55, 0.1);
}

.hamburger-icon {
  width: 24px;
  height: 24px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
}

.hamburger-line {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--text-main);
  border-radius: 2px;
  transition: transform var(--transition-normal), opacity var(--transition-normal), background-color var(--transition-normal);
}

.hamburger-btn[aria-expanded="true"] .hamburger-line {
  background-color: var(--color-gold-primary);
}

.hamburger-btn[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.hamburger-btn[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
}

.hamburger-btn[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Overlay & Mobile Drawer Layout (Activado dinámicamente cuando header.is-mobile) */
.nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: var(--bg-overlay);
  backdrop-filter: blur(4px);
  z-index: 1001;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.nav-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.nav-drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: 300px;
  max-width: 85vw;
  height: 100vh;
  background-color: var(--bg-surface);
  border-left: 1px solid var(--border-color);
  padding: calc(var(--header-height) + 1.5rem) 2rem 2.5rem 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  z-index: 1002;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  box-shadow: var(--shadow-lg);
}

.nav-drawer.is-open {
  transform: translateX(0);
}

.nav-drawer .nav-list {
  flex-direction: column;
  align-items: flex-start;
  gap: 1.5rem;
  width: 100%;
}

.nav-drawer .nav-link {
  font-size: 1.2rem;
  font-weight: 500;
  width: 100%;
}

.nav-drawer .drawer-footer {
  margin-top: auto;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Modos de visualización según desbordamiento dinámico del JS */
.site-header.is-overflowing .header-nav {
  display: none !important;
}

.site-header.is-overflowing .hamburger-btn {
  display: flex !important;
}