/* ========================================================================
   Green University — Glassmorphism Navbar (Apple / Stripe / MIT style)
   Backdrop blur · Mega menu · Search expand · Language switcher
   ======================================================================== */

/* ========== PROFESSIONAL NAVBAR — Transparent over Hero, Solid on Scroll ========== */
.grnu-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  width: 100%;
  display: flex;
  flex-direction: column;
  background: transparent;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  box-shadow: none;
  transition: box-shadow 0.35s var(--grnu-ease);
}

.grnu-navbar-wrap {
  background: transparent;
  transition: background 0.35s var(--grnu-ease), box-shadow 0.35s var(--grnu-ease);
}

.grnu-header.grnu-header--scrolled .grnu-navbar-wrap {
  background: var(--grnu-white);
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.08);
}

.grnu-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 24px;
  height: 80px;
  min-height: 80px;
  gap: 1.25rem;
}

/* ========== BRAND — Clearly visible on hero, dark green when scrolled ========== */
.grnu-brand {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.grnu-brand__text {
  font-family: var(--grnu-font-heading);
  font-size: 1.5rem; /* 24px - professional size */
  font-weight: 700;
  color: #ffffff;
  letter-spacing: -0.02em;
  transition: color 0.35s var(--grnu-ease);
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5), 0 0 1px rgba(0, 0, 0, 0.3);
}

.grnu-header--scrolled .grnu-brand__text {
  color: var(--grnu-primary);
  text-shadow: none;
}

/* ========== CENTER NAV ========== */
.grnu-nav {
  display: flex;
  align-items: center;
  flex: 1;
  justify-content: center;
  min-width: 0;
  overflow: visible;
}

.grnu-nav__menu {
  display: flex;
  align-items: center;
  flex-wrap: nowrap;
  gap: 26px;
  list-style: none;
  margin: 0;
  padding: 0;
  white-space: nowrap;
}

.grnu-nav__link {
  position: relative;
  padding: 0.5rem 0.15rem;
  font-size: 0.9375rem; /* 15px - readable menu text */
  font-weight: 500;
  color: rgba(255, 255, 255, 0.98);
  text-decoration: none;
  transition: color var(--grnu-transition);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.35);
  white-space: nowrap;
  flex-shrink: 0;
}

/* Modern green underline animation on hover */
.grnu-nav__link::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.25rem;
  height: 2px;
  background: var(--grnu-accent-hover);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.35s var(--grnu-ease);
  border-radius: 1px;
}

.grnu-header--scrolled .grnu-nav__link::after {
  background: var(--grnu-primary);
}

.grnu-nav__link:hover::after,
.grnu-nav__link:focus-visible::after {
  transform: scaleX(1);
  transform-origin: center;
}

.grnu-nav__link:hover { color: var(--grnu-white); }

.grnu-header--scrolled .grnu-nav__link {
  color: var(--grnu-text);
  text-shadow: none;
}

.grnu-header--scrolled .grnu-nav__link:hover { color: var(--grnu-primary); }

/* ========== DROPDOWN ========== */
.grnu-nav__dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  min-width: 220px;
  padding: 0.5rem 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(16px);
  border-radius: var(--grnu-radius-sm);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
  list-style: none;
  margin: 0.25rem 0 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s var(--grnu-ease), transform 0.25s var(--grnu-ease), visibility 0.25s;
  z-index: 100;
}

.grnu-nav__item--dropdown:hover .grnu-nav__dropdown,
.grnu-nav__item--dropdown.grnu-nav__item--open .grnu-nav__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.grnu-nav__dropdown a {
  display: block;
  padding: 0.625rem 1.25rem;
  font-size: 0.9375rem;
  color: var(--grnu-text);
  text-decoration: none;
  transition: background var(--grnu-transition), color var(--grnu-transition);
}

.grnu-nav__dropdown a:hover {
  background: rgba(15, 106, 68, 0.08);
  color: var(--grnu-primary);
}

/* ========== MEGA MENU — Modern Wide Dropdown ========== */
.grnu-nav__item--mega {
  position: relative;
}

.grnu-nav__mega {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-16px);
  width: min(960px, 95vw);
  padding: 28px 32px;
  background: #ffffff;
  border-radius: 16px;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.12), 0 4px 16px rgba(0, 0, 0, 0.06);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s var(--grnu-ease), transform 0.3s var(--grnu-ease), visibility 0.3s;
  z-index: 100;
  border: 1px solid rgba(0, 0, 0, 0.04);
}

.grnu-nav__item--mega:hover .grnu-nav__mega {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(8px);
}

.grnu-nav__mega-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem 2rem;
}

.grnu-nav__mega-col {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.grnu-nav__mega-item {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  padding: 1rem 1.25rem;
  border-radius: 10px;
  text-decoration: none;
  color: var(--grnu-text);
  transition: background 0.25s var(--grnu-ease), color 0.25s var(--grnu-ease), transform 0.25s var(--grnu-ease);
}

.grnu-nav__mega-item:hover {
  background: rgba(15, 106, 68, 0.08);
  color: var(--grnu-primary);
}

.grnu-nav__mega-item:hover .grnu-nav__mega-icon {
  transform: translateX(4px);
}

.grnu-nav__mega-icon {
  font-size: 1.5rem;
  margin-bottom: 0.125rem;
  transition: transform 0.25s var(--grnu-ease);
}

.grnu-nav__mega-title {
  font-weight: 600;
  font-size: 0.9375rem;
  line-height: 1.3;
}

.grnu-nav__mega-desc {
  font-size: 0.8125rem;
  color: var(--grnu-text-muted);
  line-height: 1.45;
  transition: color 0.25s var(--grnu-ease);
}

.grnu-nav__mega-item:hover .grnu-nav__mega-desc {
  color: var(--grnu-primary);
  opacity: 0.9;
}

/* ========== ACTIONS (Search, Lang, CTA) ========== */
.grnu-header__actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-shrink: 0;
}

/* Search */
.grnu-header__search {
  display: flex;
  align-items: center;
  position: relative;
}

.grnu-header__search-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.9);
  cursor: pointer;
  border-radius: var(--grnu-radius-sm);
  transition: color var(--grnu-transition), background var(--grnu-transition);
}

.grnu-header--scrolled .grnu-header__search-btn { color: var(--grnu-text); }

.grnu-header__search-btn:hover { color: var(--grnu-secondary); }

.grnu-header__search-icon {
  width: 1.25rem;
  height: 1.25rem;
}

.grnu-header__search-input-wrap {
  position: absolute;
  right: 0;
  width: 0;
  overflow: hidden;
  transition: width 0.35s var(--grnu-ease);
}

.grnu-header__search.grnu-header__search--open .grnu-header__search-input-wrap {
  width: 180px;
}

.grnu-header__search-input {
  width: 180px;
  padding: 0.5rem 1rem 0.5rem 2rem;
  font-size: 0.9375rem;
  border: 1px solid var(--grnu-border);
  border-radius: var(--grnu-radius-sm);
  background: var(--grnu-white);
  color: var(--grnu-text);
  outline: none;
  transition: border-color var(--grnu-transition);
}

.grnu-header__search-input:focus {
  border-color: var(--grnu-primary);
}

/* Language switcher */
.grnu-header__lang {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.grnu-header__lang-link {
  font-size: 0.8125rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  transition: color var(--grnu-transition), background var(--grnu-transition);
}

.grnu-header--scrolled .grnu-header__lang-link { color: var(--grnu-text-muted); }

.grnu-header__lang-link:hover { color: var(--grnu-white); }

.grnu-header--scrolled .grnu-header__lang-link:hover { color: var(--grnu-primary); }

.grnu-header__lang-link--active {
  color: var(--grnu-white) !important;
}

.grnu-header--scrolled .grnu-header__lang-link--active {
  color: var(--grnu-primary) !important;
}

.grnu-header__lang-sep {
  color: rgba(255, 255, 255, 0.4);
  font-size: 0.75rem;
}

.grnu-header--scrolled .grnu-header__lang-sep { color: var(--grnu-text-muted); opacity: 0.6; }

/* ========== APPLY NOW BUTTON — Premium with subtle pulse & glow ========== */
@keyframes grnu-cta-pulse {
  0%, 100% {
    transform: scale(1);
    box-shadow: 0 2px 12px rgba(15, 106, 68, 0.4), 0 0 20px rgba(63, 175, 108, 0.12);
  }
  50% {
    transform: scale(1.03);
    box-shadow: 0 4px 20px rgba(15, 106, 68, 0.5), 0 0 36px rgba(63, 175, 108, 0.2);
  }
}

.grnu-header__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  background: var(--grnu-primary);
  color: var(--grnu-white) !important;
  font-weight: 700;
  font-size: 0.9375rem;
  text-decoration: none;
  border-radius: 8px;
  border: none;
  transition: background 0.3s var(--grnu-ease), transform 0.25s var(--grnu-ease), box-shadow 0.25s var(--grnu-ease);
  white-space: nowrap;
  animation: grnu-cta-pulse 2.75s ease-in-out infinite;
  box-shadow: 0 2px 12px rgba(15, 106, 68, 0.35);
}

.grnu-header__cta:hover {
  background: var(--grnu-secondary);
  animation: none;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(47, 163, 107, 0.4);
}

/* Mobile Apply — hidden on desktop, shown in menu on mobile */
.grnu-nav__item--cta-mobile {
  display: none;
}

/* Hamburger */
.grnu-nav__toggle {
  color: rgba(255, 255, 255, 0.95);
}

.grnu-header--scrolled .grnu-nav__toggle { color: var(--grnu-text); }

/* ========== TABLET/MOBILE — Hamburger before menu wraps (Home + Contact visible) ========== */
@media (max-width: 1100px) {
  .grnu-header__search,
  .grnu-header__lang { display: none; }

  .grnu-header__actions {
    flex-direction: row;
    gap: 0.75rem;
  }

  .grnu-nav {
    z-index: 1001;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(340px, 92vw);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    background: var(--grnu-white);
    box-shadow: -8px 0 40px rgba(0, 0, 0, 0.12);
    padding: 5rem 1.5rem 2rem;
    display: flex;
    transform: translateX(100%);
    transition: transform 0.4s var(--grnu-ease);
    overflow-y: auto;
  }

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

  .grnu-nav__link {
    padding: 1rem 0;
    font-size: 1.0625rem;
    color: var(--grnu-text) !important;
    border-bottom: 1px solid var(--grnu-border);
  }

  .grnu-nav__link::after { display: none; }

  .grnu-nav__item--mega .grnu-nav__mega {
    position: static;
    transform: none;
    width: 100%;
    max-height: 0;
    overflow: hidden;
    padding: 0;
    margin: 0;
    box-shadow: none;
    background: var(--grnu-bg);
    border-radius: var(--grnu-radius-sm);
    transition: max-height 0.35s var(--grnu-ease);
  }

  .grnu-nav__item--mega:hover .grnu-nav__mega,
  .grnu-nav__item--mega.grnu-nav__item--open .grnu-nav__mega {
    max-height: 500px;
    padding: 1rem;
    margin: 0.5rem 0 0;
  }

  .grnu-nav__mega-inner {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  /* Show Apply Now in mobile menu */
  .grnu-nav__item--cta-mobile {
    display: block;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--grnu-border);
  }

  .grnu-header__cta--mobile {
    display: flex;
    width: 100%;
    justify-content: center;
    padding: 12px 24px;
  }
}

/* Body overlay when mobile menu open */
body.grnu-nav-overlay::before {
  content: '';
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  z-index: 999;
  pointer-events: auto;
}

@media (prefers-reduced-motion: reduce) {
  .grnu-header,
  .grnu-nav__dropdown,
  .grnu-nav__mega,
  .grnu-header__search-input-wrap { transition-duration: 0.1s; }
  .grnu-header__cta { animation: none; }
}