.ngf-site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: var(--ngf-bg-surface);
  border-bottom: 1px solid var(--ngf-border);
}

/* ------------------------------------------------------------------ */
/* Utility bar                                                         */
/* ------------------------------------------------------------------ */
.ngf-site-header__utility {
  background: var(--ngf-ink-800);
  color: var(--ngf-fg-muted-on-dark);
  font-size: var(--ngf-fs-xs);
}

.ngf-site-header__utility-inner {
  display: flex;
  align-items: center;
  gap: var(--ngf-sp-5);
  padding-top: var(--ngf-sp-2);
  padding-bottom: var(--ngf-sp-2);
  min-height: 36px;
}

.ngf-site-header__award {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: var(--ngf-sp-2);
}

/* Inline link in the utility bar: inherits the bar's muted colour, goes white
   with an underline on interaction (#fff also overrides base.css's a:hover). */
.ngf-site-header__inline-link {
  color: inherit;
  text-decoration: none;
}
.ngf-site-header__inline-link:hover,
.ngf-site-header__inline-link:focus-visible {
  color: #fff;
  text-decoration: underline;
}

/* ------------------------------------------------------------------ */
/* Main bar                                                            */
/* ------------------------------------------------------------------ */
.ngf-site-header__main {
  position: relative;
  background: var(--ngf-bg-surface);
}

.ngf-site-header__main-inner {
  display: flex;
  align-items: center;
  gap: var(--ngf-sp-8);
  padding-top: var(--ngf-sp-3);
  padding-bottom: var(--ngf-sp-3);
}

/* Logo slot */
.ngf-site-header__logo { flex-shrink: 0; }
.ngf-site-header__logo a { display: block; }
.ngf-site-header__logo img { display: block; height: 76px; width: auto; }
.ngf-site-header__logo-placeholder {
  display: block;
  font-family: var(--ngf-font-display);
  font-weight: var(--ngf-w-black);
  font-size: 1.625rem;
  letter-spacing: var(--ngf-tr-tight);
  color: var(--ngf-ink-900);
}

/* Nav slot grows; award badge + account sit at the right edge */
.ngf-site-header__nav { flex: 1 1 auto; }
.ngf-site-header__account { flex-shrink: 0; }

/* Hamburger toggle — hidden on desktop, revealed in the mobile media query */
.ngf-site-header__nav-toggle {
  display: none;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--ngf-border);
  border-radius: var(--ngf-r-sm);
  color: var(--ngf-ink-900);
  cursor: pointer;
  transition: background-color var(--ngf-dur-fast) var(--ngf-ease-out),
              border-color var(--ngf-dur-fast) var(--ngf-ease-out);
}
.ngf-site-header__nav-toggle:hover {
  background: var(--ngf-bone);
  border-color: var(--ngf-border-strong);
}
.ngf-site-header__nav-toggle-icon { width: 24px; height: 24px; }
.ngf-site-header__nav-toggle-icon--close { display: none; }
.ngf-site-header.is-nav-open .ngf-site-header__nav-toggle-icon--open { display: none; }
.ngf-site-header.is-nav-open .ngf-site-header__nav-toggle-icon--close { display: block; }

/* NSF award number — moved out of the utility bar to sit beside Sign in */
.ngf-site-header__award-badge {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
  line-height: 1.2;
  text-align: right;
}
.ngf-site-header__award-label {
  font-size: var(--ngf-fs-xs);
  color: var(--ngf-fg-2);
}
.ngf-site-header__award-id {
  font-size: var(--ngf-fs-sm);
  font-weight: var(--ngf-w-bold);
  letter-spacing: 0.01em;
  color: var(--ngf-ink-900);
  text-decoration: none;
}
.ngf-site-header__award-id:hover {
  text-decoration: underline;
}

/* ------------------------------------------------------------------ */
/* Mega-menu (rendered by menu--main.html.twig)                        */
/* ------------------------------------------------------------------ */
.ngf-megamenu {
  display: flex;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.ngf-megamenu__item { display: flex; align-items: center; }

.ngf-megamenu__top {
  display: inline-flex;
  align-items: center;
  gap: var(--ngf-sp-1);
  padding: 6px 0;
  font-family: var(--ngf-font-body);
  font-size: var(--ngf-fs-sm);
  font-weight: var(--ngf-w-semi);
  color: var(--ngf-fg-1);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--ngf-dur-fast) var(--ngf-ease-out);
}
.ngf-megamenu__top:hover,
.ngf-megamenu__item.is-open > .ngf-megamenu__top,
.ngf-megamenu__item.is-active-trail > .ngf-megamenu__top {
  color: var(--ngf-seismic-500);
}

.ngf-megamenu__chevron {
  opacity: 0.55;
  transition: transform var(--ngf-dur-base) var(--ngf-ease-out);
}
.ngf-megamenu__item.is-open > .ngf-megamenu__top .ngf-megamenu__chevron {
  transform: rotate(180deg);
}

/* Full-width dropdown panel */
.ngf-megamenu__panel {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  z-index: 25;
  background: var(--ngf-bg-surface);
  border-top: 1px solid var(--ngf-border);
  border-bottom: 1px solid var(--ngf-border);
  box-shadow: var(--ngf-shadow-3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity var(--ngf-dur-base) var(--ngf-ease-out),
              transform var(--ngf-dur-base) var(--ngf-ease-out),
              visibility 0s linear var(--ngf-dur-base);
}
.ngf-megamenu__item.is-open > .ngf-megamenu__panel {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition: opacity var(--ngf-dur-base) var(--ngf-ease-out),
              transform var(--ngf-dur-base) var(--ngf-ease-out);
}

.ngf-megamenu__panel-inner {
  padding-top: var(--ngf-sp-8);
  padding-bottom: var(--ngf-sp-10);
}

.ngf-megamenu__eyebrow {
  font-family: var(--ngf-font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ngf-fg-3);
  margin-bottom: var(--ngf-sp-5);
}

.ngf-megamenu__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.ngf-megamenu__card {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 12px 14px;
  border-radius: var(--ngf-r-sm);
  text-decoration: none;
  transition: background-color var(--ngf-dur-fast) var(--ngf-ease-out);
}
.ngf-megamenu__card:hover { background: var(--ngf-bone); }

.ngf-megamenu__icon {
  flex-shrink: 0;
  width: 38px;
  height: 38px;
  border-radius: var(--ngf-r-sm);
  background: var(--ngf-seismic-50);
  color: var(--ngf-seismic-500);
  border: 1px solid var(--ngf-seismic-100);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.ngf-megamenu__icon svg { width: 20px; height: 20px; display: block; }

.ngf-megamenu__card-text { display: block; min-width: 0; }
.ngf-megamenu__card-title {
  display: block;
  font-size: var(--ngf-fs-sm);
  font-weight: var(--ngf-w-bold);
  color: var(--ngf-ink-900);
  margin-bottom: 2px;
}
.ngf-megamenu__card-desc {
  display: block;
  font-size: 0.78125rem;
  line-height: 1.45;
  color: var(--ngf-fg-2);
}

.ngf-megamenu__foot {
  margin-top: var(--ngf-sp-6);
  padding-top: var(--ngf-sp-5);
  border-top: 1px solid var(--ngf-border);
}
.ngf-megamenu__browse {
  display: inline-flex;
  align-items: center;
  gap: var(--ngf-sp-1);
  font-size: var(--ngf-fs-sm);
  font-weight: var(--ngf-w-bold);
  text-transform: uppercase;
  letter-spacing: var(--ngf-tr-caps);
  color: var(--ngf-link);
  transition: color var(--ngf-dur-base) var(--ngf-ease-out);
}
.ngf-megamenu__browse::before { content: ">>"; }
.ngf-megamenu__browse:hover { color: var(--ngf-link-hover); }

/* ------------------------------------------------------------------ */
/* Account control (markup from ngf_chrome's auth-widget.js)          */
/* ------------------------------------------------------------------ */
.ngf-account__signin {
  display: inline-flex;
  align-items: center;
  gap: var(--ngf-sp-2);
  padding: 8px 16px;
  border-radius: var(--ngf-r-pill);
  background: var(--ngf-ink-800);
  border: 1px solid var(--ngf-ink-800);
  color: var(--ngf-white);
  font-size: 0.8125rem;
  font-weight: var(--ngf-w-bold);
  letter-spacing: 0.01em;
  white-space: nowrap;
  text-decoration: none;
  transition: background-color var(--ngf-dur-fast) var(--ngf-ease-out),
              border-color var(--ngf-dur-fast) var(--ngf-ease-out);
}
.ngf-account__signin:hover {
  background: var(--ngf-geodetic-700);
  border-color: var(--ngf-geodetic-700);
  color: var(--ngf-white);
}

.ngf-account { position: relative; }

.ngf-account__button {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 5px 12px 5px 5px;
  background: var(--ngf-bg-surface);
  border: 1px solid var(--ngf-border);
  border-radius: var(--ngf-r-pill);
  cursor: pointer;
  font-family: var(--ngf-font-body);
  transition: background-color var(--ngf-dur-fast) var(--ngf-ease-out),
              border-color var(--ngf-dur-fast) var(--ngf-ease-out);
}
.ngf-account__button:hover {
  background: var(--ngf-bone);
  border-color: var(--ngf-border-strong);
}
.ngf-account.is-open .ngf-account__button {
  background: var(--ngf-bone);
  border-color: var(--ngf-geodetic-500);
}

.ngf-account__avatar {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--ngf-geodetic-500), var(--ngf-geodetic-800));
  color: var(--ngf-white);
  font-family: var(--ngf-font-display);
  font-weight: var(--ngf-w-bold);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.ngf-account__name {
  font-size: 0.8125rem;
  font-weight: var(--ngf-w-bold);
  color: var(--ngf-ink-900);
  white-space: nowrap;
}

.ngf-account__chevron {
  color: var(--ngf-fg-2);
  transition: transform var(--ngf-dur-fast) var(--ngf-ease-out);
}
.ngf-account.is-open .ngf-account__chevron { transform: rotate(180deg); }

.ngf-account__menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 240px;
  z-index: 40;
  background: var(--ngf-bg-surface);
  border: 1px solid var(--ngf-border);
  border-radius: var(--ngf-r-md);
  box-shadow: var(--ngf-shadow-3);
  padding: 6px;
}
.ngf-account__menu[hidden] { display: none; }

.ngf-account__head {
  padding: 12px 12px 10px;
  border-bottom: 1px solid var(--ngf-border);
  margin-bottom: 6px;
}
.ngf-account__head-name {
  font-size: 0.8125rem;
  font-weight: var(--ngf-w-bold);
  color: var(--ngf-ink-900);
}

.ngf-account__list { list-style: none; margin: 0; padding: 0; }
.ngf-account__link {
  display: block;
  padding: 8px 12px;
  border-radius: var(--ngf-r-sm);
  font-size: 0.8125rem;
  color: var(--ngf-ink-900);
  text-decoration: none;
  transition: background-color var(--ngf-dur-fast) var(--ngf-ease-out);
}
.ngf-account__link:hover { background: var(--ngf-bone); color: var(--ngf-ink-900); }

/* ------------------------------------------------------------------ */
/* Mobile / tablet — collapse the nav into a hamburger-driven drawer    */
/* ------------------------------------------------------------------ */
@media (max-width: 1024px) {
  /* Utility bar: let the long award sentence wrap instead of clipping */
  .ngf-site-header__award { flex-shrink: 1; }

  /* Compact main bar: logo left, hamburger right (Sign in moves into drawer) */
  .ngf-site-header__main-inner { gap: var(--ngf-sp-4); }
  .ngf-site-header__logo img { height: 52px; }
  .ngf-site-header__award-badge { display: none; }
  .ngf-site-header__nav-toggle { display: inline-flex; margin-left: auto; }

  /* Nav becomes a full-width drawer dropping below the bar */
  .ngf-site-header__nav {
    order: 4;
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 35;
    max-height: 80vh;
    overflow-y: auto;
    background: var(--ngf-bg-surface);
    border-top: 1px solid var(--ngf-border);
    border-bottom: 1px solid var(--ngf-border);
    box-shadow: var(--ngf-shadow-3);
  }
  .ngf-site-header.is-nav-open .ngf-site-header__nav { display: block; }

  /* Stack the menu as full-width tappable rows */
  .ngf-megamenu { flex-direction: column; gap: 0; }
  .ngf-megamenu__item { display: block; border-bottom: 1px solid var(--ngf-border); }
  .ngf-megamenu__top {
    justify-content: space-between;
    width: 100%;
    padding: 14px var(--ngf-sp-6);
    font-size: var(--ngf-fs-md);
  }
  .ngf-megamenu__chevron { width: 16px; height: 16px; }

  /* Sub-panels become inline accordions toggled by .is-open (set in JS) */
  .ngf-megamenu__panel {
    position: static;
    display: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    border: 0;
    box-shadow: none;
    background: var(--ngf-bone);
  }
  .ngf-megamenu__item.is-open > .ngf-megamenu__panel { display: block; }
  .ngf-megamenu__panel-inner { padding: var(--ngf-sp-2) var(--ngf-sp-6) var(--ngf-sp-4); }
  .ngf-megamenu__eyebrow { display: none; }
  .ngf-megamenu__grid { grid-template-columns: 1fr; gap: 0; }
  .ngf-megamenu__card { padding: 10px var(--ngf-sp-2); }
  .ngf-megamenu__icon { display: none; }
  .ngf-megamenu__foot { margin-top: var(--ngf-sp-2); padding-top: var(--ngf-sp-3); }

  /* Sign in relocates to the foot of the drawer (moved there in JS) */
  .ngf-site-header__nav .ngf-site-header__account {
    padding: var(--ngf-sp-4) var(--ngf-sp-6);
    margin-left: 0;
  }
  .ngf-site-header__nav .ngf-account__signin {
    width: 100%;
    justify-content: center;
  }

  .ngf-account__name { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .ngf-megamenu__panel,
  .ngf-megamenu__chevron,
  .ngf-account__chevron { transition: none; }
}