/* ═══════════════════════════════════════════════════════════════
   NAVBAR – Educación para la Paz MEP
   ═══════════════════════════════════════════════════════════════ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-white);
  box-shadow: 0 1px 0 var(--color-gray-200);
  transition: box-shadow var(--transition-normal);
}
.site-header.scrolled {
  box-shadow: var(--shadow-md);
}

.navbar { width: 100%; }

.nav-container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-6);
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

/* ─── Brand / Logo ───────────────────────────────────────────── */
.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}
.nav-brand:hover { text-decoration: none; }
.nav-logo { flex-shrink: 0; }

.nav-brand-text {
  display: flex;
  flex-direction: column;
}
.brand-title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-blue);
  line-height: 1.2;
}
.brand-sub {
  font-size: var(--text-xs);
  color: var(--color-gray-600);
  letter-spacing: 0.04em;
}

/* ─── Menú ───────────────────────────────────────────────────── */
.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
}

.nav-item { position: relative; }

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  border: none;
  background: none;
  font-family: var(--font-body);
  transition: background var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}
.nav-link:hover {
  background: var(--color-blue-pale);
  color: var(--color-blue);
  text-decoration: none;
}
.nav-link:focus-visible {
  outline: 3px solid var(--color-green);
  outline-offset: 2px;
}
.nav-link.active {
  background: var(--color-blue-pale);
  color: var(--color-blue);
}

.dropdown-arrow {
  font-size: 0.7em;
  transition: transform var(--transition-fast);
}
.nav-dropdown-toggle[aria-expanded="true"] .dropdown-arrow {
  transform: rotate(180deg);
}

/* ─── Dropdown ───────────────────────────────────────────────── */
.dropdown-menu {
  position: absolute;
  top: calc(100% + var(--space-2));
  left: 0;
  min-width: 240px;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-gray-200);
  padding: var(--space-3);
  list-style: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity var(--transition-normal), transform var(--transition-normal), visibility var(--transition-normal);
  z-index: 100;
}
.nav-item--dropdown:hover .dropdown-menu,
.nav-item--dropdown:focus-within .dropdown-menu,
.dropdown-menu.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-link {
  display: block;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast), color var(--transition-fast);
}
.dropdown-link:hover {
  background: var(--color-blue-pale);
  color: var(--color-blue);
  text-decoration: none;
}
.dropdown-link:focus-visible {
  outline: 3px solid var(--color-green);
  outline-offset: 2px;
}

.dropdown-group-label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-gray-400);
  padding: var(--space-3) var(--space-3) var(--space-1);
}
.dropdown-divider {
  height: 1px;
  background: var(--color-gray-200);
  margin: var(--space-2) var(--space-3);
}

/* ─── Hamburguesa (móvil) ────────────────────────────────────── */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  padding: var(--space-2);
  background: none;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}
.nav-toggle:hover  { background: var(--color-gray-100); }
.nav-toggle:focus-visible {
  outline: 3px solid var(--color-green);
  outline-offset: 2px;
}

.hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

/* Estado abierto */
.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ─── Responsive (móvil) ─────────────────────────────────────── */
@media (max-width: 900px) {
  .nav-toggle { display: flex; }

  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-white);
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    padding: var(--space-6);
    gap: var(--space-2);
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform var(--transition-normal);
    border-top: 1px solid var(--color-gray-200);
  }
  .nav-menu.open {
    transform: translateX(0);
  }

  .nav-item { width: 100%; }

  .nav-link {
    width: 100%;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-base);
  }

  .dropdown-menu {
    position: static;
    box-shadow: none;
    border: none;
    background: var(--color-gray-100);
    opacity: 1;
    visibility: visible;
    transform: none;
    display: none;
    border-radius: var(--radius-md);
    margin-top: var(--space-1);
  }
  .dropdown-menu.open { display: block; }
}