/* ============================================================
   OII4 HEADER + TOPBAR + FOOTER
   Premium institutional navigation system
============================================================ */

:root {
  --oii-topbar-height: 38px;
  --oii-header-height: 82px;
}

/* ============================================================
   TOPBAR
============================================================ */

.topbar {
  position: relative;
  z-index: var(--z-header, 1000);
  min-height: var(--oii-topbar-height);
  background: var(--oii-ink, #06111f);
  color: #fff;
  font-size: 0.82rem;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.topbar-inner {
  min-height: var(--oii-topbar-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.topbar-left,
.topbar-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.topbar-menu {
  display: flex;
  align-items: center;
  gap: 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.topbar-menu a,
.topbar-social a {
  color: rgba(255,255,255,0.78);
  text-decoration: none;
  transition: color var(--transition-fast, 180ms ease);
}

.topbar-menu a:hover,
.topbar-social a:hover {
  color: #fff;
}

.topbar-social {
  display: flex;
  gap: 0.45rem;
}

.topbar-social a {
  width: 27px;
  height: 27px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill, 999px);
  border: 1px solid rgba(255,255,255,0.2);
}

/* Language */

.topbar-lang {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.7rem;
  border-radius: var(--radius-pill, 999px);
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.16);
  cursor: pointer;
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 0;
  min-width: 175px;
  display: none;
  padding: 0.45rem;
  border-radius: 16px;
  background: #fff;
  box-shadow: var(--shadow-lg);
}

.lang-dropdown.show {
  display: grid;
  gap: 0.25rem;
}

.lang-option {
  width: 100%;
  border: 0;
  background: transparent;
  text-align: left;
  padding: 0.58rem 0.7rem;
  border-radius: 12px;
  color: var(--text-primary);
  cursor: pointer;
}

.lang-option:hover {
  background: var(--surface-soft);
}

/* ============================================================
   MAIN HEADER
============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header, 1000);
  background: rgba(255,255,255,0.78);
  backdrop-filter: blur(22px);
  -webkit-backdrop-filter: blur(22px);
  border-bottom: 1px solid rgba(11,31,53,0.08);
  transition:
    background var(--transition-med),
    box-shadow var(--transition-med),
    border-color var(--transition-med),
    transform var(--transition-med);
}

.site-header.scrolled {
  background: rgba(255,255,255,0.94);
  border-color: rgba(11,31,53,0.1);
  box-shadow: 0 20px 60px rgba(11,31,53,0.10);
}

.site-header__inner {
  min-height: var(--oii-header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

/* Logo */

.site-branding {
  flex: 0 0 auto;
}

.site-branding a {
  display: inline-flex;
  align-items: center;
}

.site-branding img,
.site-branding .custom-logo {
  width: auto;
  max-height: 52px;
}

.logo-white {
  display: none;
}

/* Dark state */

.site-header.on-dark {
  background: rgba(6,17,31,0.74);
  border-color: rgba(255,255,255,0.12);
}

.site-header.on-dark .logo-normal {
  display: none;
}

.site-header.on-dark .logo-white {
  display: block;
}

/* Navigation */

.primary-navigation {
  flex: 1;
  display: flex;
  justify-content: flex-end;
}

.oii-nav {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.oii-nav-item > a {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  min-height: 44px;
  padding: 0.58rem 0.8rem;
  border-radius: var(--radius-pill, 999px);
  color: var(--text-primary);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  text-decoration: none;
  transition:
    background var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast);
}

.oii-nav-item > a:hover,
.oii-nav-item > a:focus-visible,
.oii-nav-item.is-open > a {
  background: rgba(11,31,53,0.08);
}

.site-header.on-dark .oii-nav-item > a {
  color: #fff;
}

.site-header.on-dark .oii-nav-item > a:hover,
.site-header.on-dark .oii-nav-item.is-open > a {
  background: rgba(255,255,255,0.12);
}

.oii-nav-item i {
  font-size: 0.8rem;
  transition: transform var(--transition-fast);
}

.oii-nav-item.is-open i,
.oii-nav-item:hover i {
  transform: rotate(180deg);
}

.header-donate-button {
  background: linear-gradient(135deg, var(--oii-gold), var(--oii-amber));
  color: var(--oii-ink) !important;
  box-shadow: 0 14px 30px rgba(185,120,79,0.24);
}

/* ============================================================
   MEGA MENU
============================================================ */

.oii-mega-menu {
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(14px);
  transition:
    opacity var(--transition-med),
    transform var(--transition-med),
    visibility var(--transition-med);
  background:
    radial-gradient(circle at 12% 0%, rgba(212,166,98,0.20), transparent 34%),
    linear-gradient(135deg, var(--oii-ink), var(--oii-navy) 58%, var(--oii-blue));
  color: #fff;
  border-top: 1px solid rgba(212,166,98,0.22);
  box-shadow: var(--shadow-dark);
}

.oii-mega-menu.open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}

.oii-mega-inner {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: clamp(2rem, 4vw, 4rem);
  padding-block: clamp(2rem, 4vw, 3rem);
}

#mega-resource-center .oii-mega-inner {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.oii-mega-column h2 {
  margin: 0 0 1rem;
  color: var(--oii-gold);
  font-size: 0.74rem;
  font-weight: 900;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.oii-mega-column ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.oii-mega-column li + li {
  margin-top: 0.55rem;
}

.oii-mega-column a {
  color: rgba(255,255,255,0.78);
  text-decoration: none;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.oii-mega-column a:hover {
  color: #fff;
}

.oii-child-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem 2rem;
}

.child-block > a {
  color: #fff;
  font-weight: 900;
}

.grandchild-chevron-list {
  list-style: none;
  margin: 0.5rem 0 0;
  padding: 0;
}

.grandchild-chevron-list li + li {
  margin-top: 0.35rem;
}

.grandchild-chevron-list a {
  font-size: 0.86rem;
}

.grandchild-chevron-list a::before {
  content: "›";
  margin-right: 0.4rem;
  color: var(--oii-gold);
}

.featured-item {
  overflow: hidden;
  border-radius: 22px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
}

.featured-item a {
  display: grid;
  gap: 0.75rem;
}

.featured-item img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.featured-item span {
  display: block;
  padding: 0 1rem 1rem;
  color: #fff;
  font-weight: 800;
}

/* ============================================================
   MOBILE MENU
============================================================ */

.nav-toggle {
  display: none;
  width: 46px;
  height: 46px;
  border: 0;
  border-radius: var(--radius-pill, 999px);
  color: var(--text-primary);
  background: rgba(11,31,53,0.08);
}

.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
  display: block;
  width: 22px;
  height: 2px;
  margin-inline: auto;
  background: currentColor;
  border-radius: 99px;
  position: relative;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle-icon::before {
  top: -7px;
}

.nav-toggle-icon::after {
  top: 7px;
}

.oii-mobile-menu {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal, 1200);
  background: rgba(6,17,31,0.62);
  backdrop-filter: blur(14px);
}

.oii-mobile-menu[hidden] {
  display: none;
}

.oii-mobile-inner {
  width: min(430px, 90vw);
  height: 100%;
  margin-left: auto;
  padding: 1rem;
  background:
    radial-gradient(circle at 0% 0%, rgba(185,120,79,0.10), transparent 34%),
    #fff;
  box-shadow: -30px 0 80px rgba(0,0,0,0.28);
  overflow-y: auto;
}

.oii-mobile-close {
  width: 46px;
  height: 46px;
  border: 0;
  border-radius: var(--radius-pill, 999px);
  background: var(--surface-soft);
  color: var(--text-primary);
  font-size: 1.5rem;
  float: right;
}

.mobile-nav-area {
  clear: both;
  padding-top: 2.5rem;
}

.mobile-nav-area .oii-nav {
  display: grid;
  gap: 0.65rem;
}

.mobile-nav-area .oii-nav-item > a {
  width: 100%;
  justify-content: space-between;
  min-height: 54px;
  border-radius: 18px;
  background: var(--surface-soft);
}

/* ============================================================
   FOOTER
============================================================ */

.site-footer {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 12% 0%, rgba(212,166,98,0.18), transparent 32%),
    radial-gradient(circle at 90% 20%, rgba(185,120,79,0.12), transparent 28%),
    linear-gradient(135deg, var(--oii-ink), var(--oii-navy) 56%, var(--oii-blue));
  color: #fff;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,0.6), transparent);
  pointer-events: none;
}

.footer-cta,
.footer-main,
.footer-bottom {
  position: relative;
  z-index: 1;
}

.footer-cta {
  padding: clamp(3rem, 6vw, 5rem) 0;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}

.footer-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) auto;
  gap: 2rem;
  align-items: end;
}

.footer-kicker {
  display: inline-block;
  margin-bottom: 1rem;
  color: var(--oii-gold);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.footer-cta h2 {
  max-width: 820px;
  margin: 0;
  color: #fff;
  font-size: clamp(2rem, 5vw, 4.6rem);
  line-height: 1.02;
  letter-spacing: -0.055em;
}

.footer-cta__actions {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.footer-outline {
  color: #fff;
  border-color: rgba(255,255,255,0.55);
}

.footer-main {
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr 1.2fr;
  gap: clamp(2rem, 4vw, 4rem);
  padding: clamp(3rem, 6vw, 5rem) 0;
}

.footer-brand {
  max-width: 430px;
}

.footer-logo-link {
  display: inline-flex;
  margin-bottom: 1.25rem;
}

.footer-logo-link img {
  width: auto;
  max-width: 260px;
  max-height: 72px;
  object-fit: contain;
}

.footer-brand p,
.footer-contact p {
  color: rgba(255,255,255,0.76);
  line-height: 1.75;
}

.footer-column h3 {
  margin: 0 0 1rem;
  color: var(--oii-gold);
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.footer-menu {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-menu li + li {
  margin-top: 0.55rem;
}

.footer-menu a,
.footer-contact a {
  color: rgba(255,255,255,0.78);
  text-decoration: none;
}

.footer-menu a:hover,
.footer-contact a:hover {
  color: #fff;
}

.footer-social {
  display: flex;
  gap: 0.65rem;
  margin-top: 1.5rem;
}

.footer-social a {
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill, 999px);
  color: #fff;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.18);
  text-decoration: none;
}

.footer-social a:hover {
  background: rgba(212,166,98,0.16);
  border-color: rgba(212,166,98,0.55);
}

.footer-pill {
  display: inline-flex;
  margin-top: 1rem;
  padding: 0.45rem 0.8rem;
  border-radius: var(--radius-pill, 999px);
  color: #f7eedb;
  border: 1px solid rgba(212,166,98,0.45);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12);
  background: rgba(0,0,0,0.16);
}

.footer-bottom__inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.footer-bottom p,
.footer-legal a {
  color: rgba(255,255,255,0.68);
  font-size: 0.86rem;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-legal a {
  text-decoration: none;
}

.footer-legal a:hover {
  color: #fff;
}

/* Scroll to top */

#scroll-top {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  width: 52px;
  height: 52px;
  border: 0;
  border-radius: var(--radius-pill, 999px);
  background: linear-gradient(135deg, var(--oii-gold), var(--oii-amber));
  color: var(--oii-ink);
  box-shadow: 0 18px 40px rgba(0,0,0,0.22);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition:
    opacity var(--transition-fast),
    visibility var(--transition-fast),
    transform var(--transition-fast);
}

#scroll-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

#scroll-top:hover {
  transform: translateY(-4px);
}

/* ============================================================
   RESPONSIVE
============================================================ */

@media (max-width: 992px) {
  .topbar-menu {
    display: none;
  }

  .primary-navigation {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .site-header__inner {
    min-height: 72px;
  }

  .site-branding img,
  .site-branding .custom-logo {
    max-height: 44px;
  }

  .oii-mega-menu {
    display: none;
  }
}

@media (max-width: 980px) {
  .footer-cta__inner,
  .footer-main {
    grid-template-columns: 1fr;
  }

  .footer-cta__actions {
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  .topbar-left {
    display: none;
  }

  .topbar-inner {
    justify-content: flex-end;
  }

  .footer-bottom__inner {
    align-items: flex-start;
    flex-direction: column;
    padding: 1rem 0;
  }

  .footer-social a {
    width: 46px;
    height: 46px;
  }
}

/* ============================================================
   FIX: LANGUAGE DROPDOWN ABOVE HEADER
============================================================ */

.topbar {
  position: relative;
  z-index: 30000;
  overflow: visible;
}

.topbar-inner,
.topbar-left,
.topbar-lang {
  overflow: visible;
}

.lang-dropdown {
  z-index: 40000;
}
/* ============================================================
   MEGA MENU HIERARCHY RESTORE
   Parent circles + proper chevron bullet alignment
============================================================ */

/* Main child blocks: e.g. Community Integration */
.oii-child-columns {
  gap: 1.4rem 2.2rem;
}

.child-block {
  position: relative;
  padding-left: 1.9rem;
}

.child-block::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.22rem;
  width: 0.9rem;
  height: 0.9rem;
  border-radius: 999px;
  border: 2px solid var(--oii-gold, #d4a662);
  background: rgba(212,166,98,0.12);
  box-shadow: 0 0 0 5px rgba(212,166,98,0.08);
}

.child-block > a {
  display: inline-flex;
  align-items: center;
  color: #ffffff;
  font-size: 1rem;
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.child-block > a:hover {
  color: var(--oii-gold, #d4a662);
}

/* Grandchildren: chevron should work like a bullet */
.grandchild-chevron-list {
  margin: 0.65rem 0 0;
  padding: 0;
  list-style: none;
}

.grandchild-chevron-list li {
  position: relative;
  margin: 0;
  padding-left: 1.15rem;
}

.grandchild-chevron-list li + li {
  margin-top: 0.38rem;
}

.grandchild-chevron-list a {
  display: inline-block;
  color: rgba(255,255,255,0.78);
  font-size: 0.88rem;
  line-height: 1.45;
  text-decoration: none;
}

.grandchild-chevron-list a::before {
  content: none !important;
}

.grandchild-chevron-list li::before {
  content: "›";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--oii-gold, #d4a662);
  font-weight: 900;
  line-height: 1.45;
}

.grandchild-chevron-list a:hover {
  color: #ffffff;
  transform: translateX(2px);
}

/* Resource menu lists: make them feel less plain too */
.oii-mega-column > ul > li {
  position: relative;
  padding-left: 1rem;
}

.oii-mega-column > ul > li::before {
  content: "›";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--oii-gold, #d4a662);
  font-weight: 900;
}

.oii-mega-column > ul > li > a {
  display: inline-block;
  line-height: 1.45;
    color: #ffffff;
  font-size: 0.89rem;
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -0.02em;
  text-decoration: none;
}

/* Knowledge Hub Mega Menu */

.oii-knowledge-intro {
  padding: 1.35rem;
  border-radius: 24px;
  background:
    radial-gradient(circle at top left, rgba(217,178,111,0.16), transparent 42%),
    rgba(7,27,47,0.04);
  border: 1px solid rgba(15,23,42,0.08);
}

.oii-knowledge-intro h2 {
  margin: 0.55rem 0 0;
  max-width: 320px;
  font-size: 1.55rem;
  line-height: 1.05;
  letter-spacing: -0.045em;
}

.oii-knowledge-intro p {
  margin-top: 0.9rem;
  color: rgba(15,23,42,0.7);
  font-size: 0.94rem;
  line-height: 1.65;
}

.oii-mega-cta {
  display: inline-flex;
  margin-top: 1rem;
  color: #b9784f;
  font-weight: 900;
  text-decoration: none;
}

.oii-mega-cta:hover,
.oii-mega-cta:focus-visible {
  color: #071b2f;
}

.oii-knowledge-featured .featured-item a {
  border-radius: 22px;
  overflow: hidden;
  background: #ffffff;
  box-shadow: 0 18px 42px rgba(15,23,42,0.08);
}

.oii-knowledge-featured .featured-item span {
  padding: 0.9rem;
}

/* ============================================================
   FIX: KNOWLEDGE HUB MEGA MENU 5-COLUMN LAYOUT
============================================================ */

#mega-resource-center .oii-mega-inner.oii-knowledge-mega-inner {
  display: grid !important;
  grid-template-columns: 1.3fr 1fr 1fr 1fr 1.2fr !important;
  gap: 1.25rem !important;
  align-items: stretch;
}

#mega-resource-center .oii-knowledge-mega-inner .oii-mega-column {
  width: auto !important;
  max-width: none !important;
  min-width: 0;
}

/* Keep intro card readable on dark mega background */

#mega-resource-center .oii-knowledge-intro {
  background:
    radial-gradient(circle at top left, rgba(217,178,111,0.20), transparent 42%),
    rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
}

#mega-resource-center .oii-knowledge-intro h2 {
  color: #ffffff;
}

#mega-resource-center .oii-knowledge-intro p {
  color: rgba(255,255,255,0.76);
}

#mega-resource-center .oii-mega-cta {
  color: var(--oii-gold, #d4a662);
}

#mega-resource-center .oii-mega-cta:hover {
  color: #ffffff;
}

/* Featured publication card */

#mega-resource-center .oii-knowledge-featured .featured-item {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
}

#mega-resource-center .oii-knowledge-featured .featured-item a {
  display: block;
  background: transparent;
  box-shadow: none;
}

#mega-resource-center .oii-knowledge-featured .featured-item img {
  width: 100%;
  height: 145px;
  object-fit: cover;
}

#mega-resource-center .oii-knowledge-featured .featured-item span {
  display: block;
  color: #ffffff;
  padding: 0.9rem;
}

/* Responsive fallback */

@media (max-width: 1200px) {
  #mega-resource-center .oii-mega-inner.oii-knowledge-mega-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
  }
}