/**
 * @file
 * The main menu (templates/navigation/menu--main.html.twig, js/site-nav.js).
 *
 * Small screens: a drawer under the header, opened by the Menu button; panels open in place.
 * Wide screens (64em and up): a row of links in the header; a panel drops down under the header as a card of
 * headed groups. Without JavaScript the menu is a plain list below the header with every panel shown.
 */

.site-nav ul { list-style: none; margin: 0; padding: 0; }
.site-nav a { text-decoration: none; }

.site-nav__link {
  display: block;
  padding: .55rem .7rem;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-weight: var(--weight-medium);
  white-space: nowrap;
}
.site-nav__link:hover { background: var(--color-surface-2); color: var(--color-text); }
.site-nav__item.is-active-trail > .site-nav__link,
.site-nav__item.is-active-trail > .site-nav__row > .site-nav__link {
  color: var(--color-accent-text);
  box-shadow: inset 0 -2px 0 var(--color-accent);
  border-radius: 0;
}
.site-nav__row { display: flex; align-items: center; }
.site-nav__toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
}
.site-nav__toggle:hover { background: var(--color-surface-2); color: var(--color-text); }
.site-nav__toggle svg { width: 16px; height: 16px; transition: transform var(--motion-base) var(--ease); }
.site-nav__toggle[aria-expanded="true"] svg { transform: rotate(180deg); }

.site-nav__groups {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: .25rem 1.5rem;
}
.site-nav__group-link {
  display: block;
  padding: .4rem 0;
  color: var(--color-text);
  font-weight: var(--weight-strong);
}
.site-nav__group.has-links > .site-nav__group-link {
  font-family: var(--font-display);
  font-size: var(--text-lg);
}
.site-nav__group-link:hover, .site-nav__sublist a:hover { color: var(--color-accent-text); }
.site-nav__sublist { margin-bottom: .75rem !important; }
/* A deeper level (Route Maps > South America > its countries): indented under its parent, a rule to its left. */
.site-nav__sublist .site-nav__sublist {
  margin: 0 0 .25rem .15rem !important;
  padding-left: .75rem !important;
  border-left: 2px solid var(--color-border);
}
.site-nav__sublist a {
  display: block;
  padding: .25rem 0;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}
.site-nav__group.is-active-trail > .site-nav__group-link,
.site-nav__sublist .is-active-trail > a { color: var(--color-accent-text); }

/* The menu button: three bars that turn into a cross. */
.nav-toggle__bars, .nav-toggle__bars span, .nav-toggle__bars::before, .nav-toggle__bars::after {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--motion-base) var(--ease), opacity var(--motion-fast) var(--ease);
}
.nav-toggle__bars { position: relative; background: transparent; }
.nav-toggle__bars span { position: absolute; top: 0; }
.nav-toggle__bars::before, .nav-toggle__bars::after { content: ""; position: absolute; }
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(-6px) rotate(-45deg); }

/* Small screens */
@media (max-width: 63.99em) {
  .site-header__inner { flex-wrap: wrap; }
  .site-header__tools { order: 2; }
  .site-nav { order: 3; flex-basis: 100%; padding-bottom: .75rem; }
  .site-nav__toggle { width: 44px; height: 44px; margin-left: auto; }
  .site-nav__row .site-nav__link { flex: 1; }
  .site-nav__link { padding: .7rem .25rem; font-size: var(--text-lg); }
  .site-nav__list > li { border-bottom: 1px solid var(--color-border); }
  .site-nav__panel { padding: 0 0 .75rem .75rem; }
  .site-nav__groups { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }

  .js .site-nav { display: none; }
  .js .site-nav__panel { display: none; }
  .js .site-nav__item.is-open > .site-nav__panel { display: block; }
  .js .is-drawer-open .site-nav {
    display: block;
    position: fixed;
    inset: var(--header-h) 0 0 0;
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: .5rem var(--gutter) 2rem;
    background: var(--color-bg);
    animation: marlene-drawer var(--motion-base) var(--ease);
  }
  /* A backdrop-filter would make the header the drawer's containing block. */
  .js .site-header.is-drawer-open {
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
    background: var(--color-bg);
  }
  .has-nav-drawer, .has-nav-drawer body { overflow: hidden; }
  .nav-toggle__label { font-size: var(--text-sm); }
}
@media (max-width: 24em) {
  .nav-toggle__label { display: none; }
}

/* Wide screens */
@media (min-width: 64em) {
  .nav-toggle { display: none !important; }
  .site-nav__list { display: flex; align-items: center; gap: .1rem; }
  .site-nav__toggle { width: 26px; margin-left: -.35rem; }
  .site-nav__panel {
    display: none;
    position: absolute;
    top: calc(100% + 1px);
    left: 50%;
    width: min(920px, calc(100vw - 2 * var(--gutter)));
    transform: translateX(-50%);
    padding: 1.5rem 1.75rem 1.25rem;
    border: 1px solid var(--color-border);
    border-top: 0;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    background: var(--color-surface);
    box-shadow: var(--shadow-lg);
  }
  .site-nav__item.is-open > .site-nav__panel { display: block; animation: marlene-drop var(--motion-base) var(--ease); }
  /* Without JavaScript, hover or focus opens a panel. */
  html:not(.js) .site-nav__item:hover > .site-nav__panel,
  html:not(.js) .site-nav__item:focus-within > .site-nav__panel { display: block; }
}

@keyframes marlene-drop {
  from { opacity: 0; transform: translate(-50%, -6px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}
@keyframes marlene-drawer {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: none; }
}